lesson23_GPS_RTL_SDR_calculateCA_simplified.grc

options:
  parameters:
    author: jason
    catch_exceptions: 'True'
    category: '[GRC Hier Blocks]'
    cmake_opt: ''
    comment: ''
    copyright: ''
    description: ''
    gen_cmake: 'On'
    gen_linking: dynamic
    generate_options: qt_gui
    hier_block_src_path: '.:'
    id: GPS_RTL_SDR
    max_nouts: '0'
    output_language: python
    placement: (0,0)
    qt_qss_theme: ''
    realtime_scheduling: ''
    run: 'True'
    run_command: '{python} -u {filename}'
    run_options: prompt
    sizing_mode: fixed
    thread_safe_setters: ''
    title: GPS_RTL_SDR
    window_size: ''
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [8, 8]
    rotation: 0
    state: enabled

blocks:
- name: Ncycles
  id: variable
  parameters:
    comment: ''
    value: '4'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [680, 12.0]
    rotation: 0
    state: enabled
- name: doppler_shift
  id: variable_qtgui_range
  parameters:
    comment: ''
    gui_hint: ''
    label: ''
    min_len: '200'
    orient: QtCore.Qt.Horizontal
    rangeType: float
    start: -5e3
    step: '50'
    stop: 5e3
    value: '0'
    widget: counter_slider
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [64, 1100.0]
    rotation: 0
    state: true
- name: samp_rate
  id: variable
  parameters:
    comment: ''
    value: 2*1023*1000
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [200, 12.0]
    rotation: 0
    state: enabled
- name: vector_size
  id: variable
  parameters:
    comment: ''
    value: int(Ncycles*samp_rate/1000)
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [760, 12.0]
    rotation: 0
    state: enabled
- name: analog_const_source_x_0
  id: analog_const_source_x
  parameters:
    affinity: ''
    alias: ''
    comment: ''
    const: '0'
    maxoutbuf: '0'
    minoutbuf: '0'
    type: byte
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [16, 204.0]
    rotation: 0
    state: true
- name: analog_const_source_x_1
  id: analog_const_source_x
  parameters:
    affinity: ''
    alias: ''
    comment: ''
    const: '0'
    maxoutbuf: '0'
    minoutbuf: '0'
    type: float
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [760, 580.0]
    rotation: 180
    state: true
- name: analog_sig_source_x_0
  id: analog_sig_source_x
  parameters:
    affinity: ''
    alias: ''
    amp: '1'
    comment: 'complex exponential

      used to un-doppler shift'
    freq: doppler_shift
    maxoutbuf: '0'
    minoutbuf: '0'
    offset: '0'
    phase: '0'
    samp_rate: samp_rate
    type: complex
    waveform: analog.GR_COS_WAVE
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [152, 1212.0]
    rotation: 0
    state: true
- name: blocks_char_to_float_0
  id: blocks_char_to_float
  parameters:
    affinity: ''
    alias: ''
    comment: ''
    maxoutbuf: '0'
    minoutbuf: '0'
    scale: '1'
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [768, 532.0]
    rotation: 180
    state: true
- name: blocks_complex_to_mag_0
  id: blocks_complex_to_mag
  parameters:
    affinity: ''
    alias: ''
    comment: ''
    maxoutbuf: '0'
    minoutbuf: '0'
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1016, 1032.0]
    rotation: 180
    state: true
- name: blocks_delay_0
  id: blocks_delay
  parameters:
    affinity: ''
    alias: ''
    comment: '1'
    delay: '1'
    maxoutbuf: '0'
    minoutbuf: '0'
    num_ports: '1'
    type: byte
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [432, 288.0]
    rotation: 0
    state: true
- name: blocks_delay_0_0
  id: blocks_delay
  parameters:
    affinity: ''
    alias: ''
    comment: '2'
    delay: '1'
    maxoutbuf: '0'
    minoutbuf: '0'
    num_ports: '1'
    type: byte
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [528, 288.0]
    rotation: 0
    state: true
- name: blocks_delay_0_0_0
  id: blocks_delay
  parameters:
    affinity: ''
    alias: ''
    comment: '3'
    delay: '1'
    maxoutbuf: '0'
    minoutbuf: '0'
    num_ports: '1'
    type: byte
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [632, 288.0]
    rotation: 0
    state: true
- name: blocks_delay_0_0_0_0
  id: blocks_delay
  parameters:
    affinity: ''
    alias: ''
    comment: '4'
    delay: '1'
    maxoutbuf: '0'
    minoutbuf: '0'
    num_ports: '1'
    type: byte
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [736, 288.0]
    rotation: 0
    state: true
- name: blocks_delay_0_0_0_0_0
  id: blocks_delay
  parameters:
    affinity: ''
    alias: ''
    comment: '5'
    delay: '1'
    maxoutbuf: '0'
    minoutbuf: '0'
    num_ports: '1'
    type: byte
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [832, 288.0]
    rotation: 0
    state: true
- name: blocks_delay_0_0_0_0_0_0
  id: blocks_delay
  parameters:
    affinity: ''
    alias: ''
    comment: '6'
    delay: '1'
    maxoutbuf: '0'
    minoutbuf: '0'
    num_ports: '1'
    type: byte
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [936, 288.0]
    rotation: 0
    state: true
- name: blocks_delay_0_0_0_0_0_0_0
  id: blocks_delay
  parameters:
    affinity: ''
    alias: ''
    comment: '7'
    delay: '1'
    maxoutbuf: '0'
    minoutbuf: '0'
    num_ports: '1'
    type: byte
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1032, 288.0]
    rotation: 0
    state: true
- name: blocks_delay_0_0_0_0_0_0_0_0
  id: blocks_delay
  parameters:
    affinity: ''
    alias: ''
    comment: '10'
    delay: '1'
    maxoutbuf: '0'
    minoutbuf: '0'
    num_ports: '1'
    type: byte
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1328, 288.0]
    rotation: 0
    state: true
- name: blocks_delay_0_0_0_0_0_0_0_0_0
  id: blocks_delay
  parameters:
    affinity: ''
    alias: ''
    comment: '10'
    delay: '1'
    maxoutbuf: '0'
    minoutbuf: '0'
    num_ports: '1'
    type: byte
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1328, 128.0]
    rotation: 0
    state: true
- name: blocks_delay_0_0_0_0_0_0_0_1
  id: blocks_delay
  parameters:
    affinity: ''
    alias: ''
    comment: '7'
    delay: '1'
    maxoutbuf: '0'
    minoutbuf: '0'
    num_ports: '1'
    type: byte
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1040, 128.0]
    rotation: 0
    state: true
- name: blocks_delay_0_0_0_0_0_0_1
  id: blocks_delay
  parameters:
    affinity: ''
    alias: ''
    comment: '9'
    delay: '1'
    maxoutbuf: '0'
    minoutbuf: '0'
    num_ports: '1'
    type: byte
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1224, 288.0]
    rotation: 0
    state: true
- name: blocks_delay_0_0_0_0_0_0_1_0
  id: blocks_delay
  parameters:
    affinity: ''
    alias: ''
    comment: '9'
    delay: '1'
    maxoutbuf: '0'
    minoutbuf: '0'
    num_ports: '1'
    type: byte
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1232, 128.0]
    rotation: 0
    state: true
- name: blocks_delay_0_0_0_0_0_0_2
  id: blocks_delay
  parameters:
    affinity: ''
    alias: ''
    comment: '6'
    delay: '1'
    maxoutbuf: '0'
    minoutbuf: '0'
    num_ports: '1'
    type: byte
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [936, 128.0]
    rotation: 0
    state: true
- name: blocks_delay_0_0_0_0_0_1
  id: blocks_delay
  parameters:
    affinity: ''
    alias: ''
    comment: '8'
    delay: '1'
    maxoutbuf: '0'
    minoutbuf: '0'
    num_ports: '1'
    type: byte
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1128, 288.0]
    rotation: 0
    state: true
- name: blocks_delay_0_0_0_0_0_1_0
  id: blocks_delay
  parameters:
    affinity: ''
    alias: ''
    comment: '8'
    delay: '1'
    maxoutbuf: '0'
    minoutbuf: '0'
    num_ports: '1'
    type: byte
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1136, 128.0]
    rotation: 0
    state: true
- name: blocks_delay_0_0_0_0_0_2
  id: blocks_delay
  parameters:
    affinity: ''
    alias: ''
    comment: '5'
    delay: '1'
    maxoutbuf: '0'
    minoutbuf: '0'
    num_ports: '1'
    type: byte
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [840, 128.0]
    rotation: 0
    state: true
- name: blocks_delay_0_0_0_0_1
  id: blocks_delay
  parameters:
    affinity: ''
    alias: ''
    comment: '4'
    delay: '1'
    maxoutbuf: '0'
    minoutbuf: '0'
    num_ports: '1'
    type: byte
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [736, 128.0]
    rotation: 0
    state: true
- name: blocks_delay_0_0_0_1
  id: blocks_delay
  parameters:
    affinity: ''
    alias: ''
    comment: '3'
    delay: '1'
    maxoutbuf: '0'
    minoutbuf: '0'
    num_ports: '1'
    type: byte
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [640, 128.0]
    rotation: 0
    state: true
- name: blocks_delay_0_0_1
  id: blocks_delay
  parameters:
    affinity: ''
    alias: ''
    comment: '2'
    delay: '1'
    maxoutbuf: '0'
    minoutbuf: '0'
    num_ports: '1'
    type: byte
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [544, 128.0]
    rotation: 0
    state: true
- name: blocks_delay_0_1
  id: blocks_delay
  parameters:
    affinity: ''
    alias: ''
    comment: '1'
    delay: '1'
    maxoutbuf: '0'
    minoutbuf: '0'
    num_ports: '1'
    type: byte
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [440, 128.0]
    rotation: 0
    state: true
- name: blocks_float_to_complex_0
  id: blocks_float_to_complex
  parameters:
    affinity: ''
    alias: ''
    comment: 'CA code as complex numbers

      with each value repeated twice in a row'
    maxoutbuf: '0'
    minoutbuf: '0'
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [504, 536.0]
    rotation: 180
    state: true
- name: blocks_multiply_conjugate_cc_0
  id: blocks_multiply_conjugate_cc
  parameters:
    affinity: ''
    alias: ''
    comment: ''
    maxoutbuf: '0'
    minoutbuf: '0'
    vlen: vector_size
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1184, 1176.0]
    rotation: 0
    state: true
- name: blocks_multiply_const_vxx_0
  id: blocks_multiply_const_vxx
  parameters:
    affinity: ''
    alias: ''
    comment: ''
    const: '[1/vector_size]*vector_size'
    maxoutbuf: '0'
    minoutbuf: '0'
    type: complex
    vlen: vector_size
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1400, 1084.0]
    rotation: 180
    state: true
- name: blocks_multiply_xx_0
  id: blocks_multiply_xx
  parameters:
    affinity: ''
    alias: ''
    comment: 'out is a doppler-shifted

      RTL-SDR signal'
    maxoutbuf: '0'
    minoutbuf: '0'
    num_inputs: '2'
    type: complex
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [464, 1224.0]
    rotation: 0
    state: true
- name: blocks_multiply_xx_0_0
  id: blocks_multiply_xx
  parameters:
    affinity: ''
    alias: ''
    comment: 'multiply doppler-shifted input

      by time-shifted resampled CA code'
    maxoutbuf: '0'
    minoutbuf: '0'
    num_inputs: '2'
    type: complex
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [624, 720.0]
    rotation: 0
    state: enabled
- name: blocks_null_sink_0
  id: blocks_null_sink
  parameters:
    affinity: ''
    alias: ''
    bus_structure_sink: '[[0,],]'
    comment: ''
    num_inputs: '1'
    type: byte
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1480, 352.0]
    rotation: 0
    state: true
- name: blocks_repeat_0
  id: blocks_repeat
  parameters:
    affinity: ''
    alias: ''
    comment: repeat each CA code chip twice
    interp: '2'
    maxoutbuf: '0'
    minoutbuf: '0'
    type: byte
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1392, 532.0]
    rotation: 180
    state: true
- name: blocks_stream_to_vector_0_0
  id: blocks_stream_to_vector
  parameters:
    affinity: ''
    alias: ''
    comment: 'start FFT circular correlation

      by turning doppler-shifted RTL-SDR into stream'
    maxoutbuf: '0'
    minoutbuf: '0'
    num_items: vector_size
    type: complex
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [680, 1264.0]
    rotation: 0
    state: true
- name: blocks_stream_to_vector_0_0_0
  id: blocks_stream_to_vector
  parameters:
    affinity: ''
    alias: ''
    comment: 'start FFT circular correlation

      by turning re-sampled code into stream'
    maxoutbuf: '0'
    minoutbuf: '0'
    num_items: vector_size
    type: complex
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [680, 1120.0]
    rotation: 0
    state: true
- name: blocks_vector_to_stream_0
  id: blocks_vector_to_stream
  parameters:
    affinity: ''
    alias: ''
    comment: ''
    maxoutbuf: '0'
    minoutbuf: '0'
    num_items: vector_size
    type: complex
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1192, 1096.0]
    rotation: 180
    state: true
- name: blocks_xor_xx_0
  id: blocks_xor_xx
  parameters:
    affinity: ''
    alias: ''
    comment: 'Find SV CA code taps on p23 of

      http://www.naic.edu/~phil/rfi/gps/AFD-070803-059-1.pdf'
    maxoutbuf: '0'
    minoutbuf: '0'
    num_inputs: '2'
    type: byte
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [888, 424.0]
    rotation: 0
    state: true
- name: blocks_xor_xx_1
  id: blocks_xor_xx
  parameters:
    affinity: ''
    alias: ''
    comment: SV cacode
    maxoutbuf: '0'
    minoutbuf: '0'
    num_inputs: '2'
    type: byte
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1456, 408.0]
    rotation: 0
    state: true
- name: digital_map_bb_0
  id: digital_map_bb
  parameters:
    affinity: ''
    alias: ''
    comment: 'turn 0 into -1

      and 1 into +1

      for correlation'
    map: '[-1,1]'
    maxoutbuf: '0'
    minoutbuf: '0'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1120, 532.0]
    rotation: 180
    state: true
- name: digital_scrambler_bb_1_0
  id: digital_scrambler_bb
  parameters:
    affinity: ''
    alias: ''
    comment: "G1 LFSR:\nx^10+x^3+1\nFor the scrambler,\nlength really means length-1\n\
      GPS documentation's definition \nof the bits is the opposite order"
    len: 10-1
    mask: 2**(10-10) + 2**(10-3)
    maxoutbuf: '0'
    minoutbuf: '0'
    seed: 2**10-1
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [208, 108.0]
    rotation: 0
    state: enabled
- name: digital_scrambler_bb_1_0_0
  id: digital_scrambler_bb
  parameters:
    affinity: ''
    alias: ''
    comment: "G2 LFSR: \nx^10+x^9+x^8+x^6+x^3+x^2+1"
    len: 10-1
    mask: 2**(10-10) + 2**(10-9) + 2**(10-8) + 2**(10-6) + 2**(10-3) + 2**(10-2)
    maxoutbuf: '0'
    minoutbuf: '0'
    seed: 2**10-1
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [200, 268.0]
    rotation: 0
    state: enabled
- name: fft_vxx_0
  id: fft_vxx
  parameters:
    affinity: ''
    alias: ''
    comment: "In a real system, this one can be \npre-computed for each satellite"
    fft_size: vector_size
    forward: 'True'
    maxoutbuf: '0'
    minoutbuf: '0'
    nthreads: '1'
    shift: 'False'
    type: complex
    window: window.rectangular(vector_size)
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [944, 1084.0]
    rotation: 0
    state: true
- name: fft_vxx_0_0
  id: fft_vxx
  parameters:
    affinity: ''
    alias: ''
    comment: ''
    fft_size: vector_size
    forward: 'True'
    maxoutbuf: '0'
    minoutbuf: '0'
    nthreads: '1'
    shift: 'False'
    type: complex
    window: window.rectangular(vector_size)
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [944, 1228.0]
    rotation: 0
    state: true
- name: fft_vxx_1
  id: fft_vxx
  parameters:
    affinity: ''
    alias: ''
    comment: ''
    fft_size: vector_size
    forward: 'False'
    maxoutbuf: '0'
    minoutbuf: '0'
    nthreads: '1'
    shift: 'False'
    type: complex
    window: window.rectangular(vector_size)
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1384, 1156.0]
    rotation: 0
    state: true
- name: low_pass_filter_0
  id: low_pass_filter
  parameters:
    affinity: ''
    alias: ''
    beta: '6.76'
    comment: 'This should roughly take the product

      one cycle of 1023 chips

      times doppler-shifted input

      and average the products together'
    cutoff_freq: '1000'
    decim: int(samp_rate/1000)
    gain: '1'
    interp: '1'
    maxoutbuf: '0'
    minoutbuf: '0'
    samp_rate: samp_rate
    type: fir_filter_ccf
    width: '100'
    win: window.WIN_HAMMING
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [824, 684.0]
    rotation: 0
    state: enabled
- name: qtgui_time_sink_x_0_1
  id: qtgui_time_sink_x
  parameters:
    affinity: ''
    alias: ''
    alpha1: '1.0'
    alpha10: '1.0'
    alpha2: '1.0'
    alpha3: '1.0'
    alpha4: '1.0'
    alpha5: '1.0'
    alpha6: '1.0'
    alpha7: '1.0'
    alpha8: '1.0'
    alpha9: '1.0'
    autoscale: 'True'
    axislabels: 'True'
    color1: blue
    color10: dark blue
    color2: red
    color3: green
    color4: black
    color5: cyan
    color6: magenta
    color7: yellow
    color8: dark red
    color9: dark green
    comment: ''
    ctrlpanel: 'False'
    entags: 'True'
    grid: 'False'
    gui_hint: ''
    label1: Once Cycle of CA Code Resampled
    label10: Signal 10
    label2: Once Cycle of CA Code Resampled Im (zero)
    label3: Once Cycle of CA Code Delayed
    label4: Once Cycle of CA Code Delayed (zero)
    label5: Signal 5
    label6: Signal 6
    label7: Signal 7
    label8: Signal 8
    label9: Signal 9
    legend: 'True'
    marker1: '0'
    marker10: '-1'
    marker2: '-1'
    marker3: '-1'
    marker4: '-1'
    marker5: '-1'
    marker6: '-1'
    marker7: '-1'
    marker8: '-1'
    marker9: '-1'
    name: '""'
    nconnections: '1'
    size: int(samp_rate/1000)
    srate: '1'
    stemplot: 'False'
    style1: '1'
    style10: '1'
    style2: '1'
    style3: '1'
    style4: '1'
    style5: '1'
    style6: '1'
    style7: '1'
    style8: '1'
    style9: '1'
    tr_chan: '0'
    tr_delay: '0'
    tr_level: '0.0'
    tr_mode: qtgui.TRIG_MODE_FREE
    tr_slope: qtgui.TRIG_SLOPE_POS
    tr_tag: '""'
    type: complex
    update_time: '0.10'
    width1: '1'
    width10: '1'
    width2: '1'
    width3: '1'
    width4: '1'
    width5: '1'
    width6: '1'
    width7: '1'
    width8: '1'
    width9: '1'
    ylabel: Amplitude
    ymax: '1'
    ymin: '-1'
    yunit: '""'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [216, 532.0]
    rotation: 180
    state: true
- name: qtgui_time_sink_x_0_2_0
  id: qtgui_time_sink_x
  parameters:
    affinity: ''
    alias: ''
    alpha1: '1.0'
    alpha10: '1.0'
    alpha2: '1.0'
    alpha3: '1.0'
    alpha4: '1.0'
    alpha5: '1.0'
    alpha6: '1.0'
    alpha7: '1.0'
    alpha8: '1.0'
    alpha9: '1.0'
    autoscale: 'False'
    axislabels: 'True'
    color1: blue
    color10: dark blue
    color2: red
    color3: green
    color4: black
    color5: cyan
    color6: magenta
    color7: yellow
    color8: dark red
    color9: dark green
    comment: plot magnitude of correlation
    ctrlpanel: 'False'
    entags: 'True'
    grid: 'False'
    gui_hint: ''
    label1: Correlation Mag
    label10: Signal 10
    label2: Correlation Im
    label3: Signal 3
    label4: Signal 4
    label5: Signal 5
    label6: Signal 6
    label7: Signal 7
    label8: Signal 8
    label9: Signal 9
    legend: 'True'
    marker1: '-1'
    marker10: '-1'
    marker2: '-1'
    marker3: '-1'
    marker4: '-1'
    marker5: '-1'
    marker6: '-1'
    marker7: '-1'
    marker8: '-1'
    marker9: '-1'
    name: '""'
    nconnections: '1'
    size: vector_size
    srate: '1'
    stemplot: 'False'
    style1: '1'
    style10: '1'
    style2: '1'
    style3: '1'
    style4: '1'
    style5: '1'
    style6: '1'
    style7: '1'
    style8: '1'
    style9: '1'
    tr_chan: '0'
    tr_delay: '0'
    tr_level: '0.0'
    tr_mode: qtgui.TRIG_MODE_FREE
    tr_slope: qtgui.TRIG_SLOPE_POS
    tr_tag: '""'
    type: float
    update_time: '0.10'
    width1: '1'
    width10: '1'
    width2: '1'
    width3: '1'
    width4: '1'
    width5: '1'
    width6: '1'
    width7: '1'
    width8: '1'
    width9: '1'
    ylabel: Amplitude
    ymax: 40*Ncycles
    ymin: '0'
    yunit: '""'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1008, 924.0]
    rotation: 0
    state: true
- name: qtgui_time_sink_x_1
  id: qtgui_time_sink_x
  parameters:
    affinity: ''
    alias: ''
    alpha1: '1.0'
    alpha10: '1.0'
    alpha2: '1.0'
    alpha3: '1.0'
    alpha4: '1.0'
    alpha5: '1.0'
    alpha6: '1.0'
    alpha7: '1.0'
    alpha8: '1.0'
    alpha9: '1.0'
    autoscale: 'False'
    axislabels: 'True'
    color1: blue
    color10: dark blue
    color2: red
    color3: green
    color4: black
    color5: cyan
    color6: magenta
    color7: yellow
    color8: dark red
    color9: dark green
    comment: 'This should be 10 samples per GPS data bit

      unless doppler is removed perfectly,

      this will have a residual oscillation.

      This won''t show anything at all until

      the correlation peak happens at 0 shift,

      which only happens very briefly'
    ctrlpanel: 'False'
    entags: 'True'
    grid: 'False'
    gui_hint: ''
    label1: Correlate Against Each Cycle Re
    label10: Signal 10
    label2: Correlate Against Each Cycle Im
    label3: Signal 3
    label4: Signal 4
    label5: Signal 5
    label6: Signal 6
    label7: Signal 7
    label8: Signal 8
    label9: Signal 9
    legend: 'True'
    marker1: '0'
    marker10: '-1'
    marker2: '0'
    marker3: '-1'
    marker4: '-1'
    marker5: '-1'
    marker6: '-1'
    marker7: '-1'
    marker8: '-1'
    marker9: '-1'
    name: '""'
    nconnections: '1'
    size: '1000'
    srate: 1e3
    stemplot: 'False'
    style1: '1'
    style10: '1'
    style2: '1'
    style3: '1'
    style4: '1'
    style5: '1'
    style6: '1'
    style7: '1'
    style8: '1'
    style9: '1'
    tr_chan: '0'
    tr_delay: '0'
    tr_level: '0.0'
    tr_mode: qtgui.TRIG_MODE_FREE
    tr_slope: qtgui.TRIG_SLOPE_POS
    tr_tag: '""'
    type: complex
    update_time: '0.10'
    width1: '1'
    width10: '1'
    width2: '1'
    width3: '1'
    width4: '1'
    width5: '1'
    width6: '1'
    width7: '1'
    width8: '1'
    width9: '1'
    ylabel: Amplitude
    ymax: '0.02'
    ymin: '-0.02'
    yunit: '""'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1032, 716.0]
    rotation: 0
    state: enabled
- name: rtlsdr_source_0
  id: rtlsdr_source
  parameters:
    affinity: ''
    alias: ''
    ant0: ''
    ant1: ''
    ant10: ''
    ant11: ''
    ant12: ''
    ant13: ''
    ant14: ''
    ant15: ''
    ant16: ''
    ant17: ''
    ant18: ''
    ant19: ''
    ant2: ''
    ant20: ''
    ant21: ''
    ant22: ''
    ant23: ''
    ant24: ''
    ant25: ''
    ant26: ''
    ant27: ''
    ant28: ''
    ant29: ''
    ant3: ''
    ant30: ''
    ant31: ''
    ant4: ''
    ant5: ''
    ant6: ''
    ant7: ''
    ant8: ''
    ant9: ''
    args: '"rtl,bias=1"'
    bb_gain0: '20'
    bb_gain1: '20'
    bb_gain10: '20'
    bb_gain11: '20'
    bb_gain12: '20'
    bb_gain13: '20'
    bb_gain14: '20'
    bb_gain15: '20'
    bb_gain16: '20'
    bb_gain17: '20'
    bb_gain18: '20'
    bb_gain19: '20'
    bb_gain2: '20'
    bb_gain20: '20'
    bb_gain21: '20'
    bb_gain22: '20'
    bb_gain23: '20'
    bb_gain24: '20'
    bb_gain25: '20'
    bb_gain26: '20'
    bb_gain27: '20'
    bb_gain28: '20'
    bb_gain29: '20'
    bb_gain3: '20'
    bb_gain30: '20'
    bb_gain31: '20'
    bb_gain4: '20'
    bb_gain5: '20'
    bb_gain6: '20'
    bb_gain7: '20'
    bb_gain8: '20'
    bb_gain9: '20'
    bw0: '0'
    bw1: '0'
    bw10: '0'
    bw11: '0'
    bw12: '0'
    bw13: '0'
    bw14: '0'
    bw15: '0'
    bw16: '0'
    bw17: '0'
    bw18: '0'
    bw19: '0'
    bw2: '0'
    bw20: '0'
    bw21: '0'
    bw22: '0'
    bw23: '0'
    bw24: '0'
    bw25: '0'
    bw26: '0'
    bw27: '0'
    bw28: '0'
    bw29: '0'
    bw3: '0'
    bw30: '0'
    bw31: '0'
    bw4: '0'
    bw5: '0'
    bw6: '0'
    bw7: '0'
    bw8: '0'
    bw9: '0'
    clock_source0: ''
    clock_source1: ''
    clock_source2: ''
    clock_source3: ''
    clock_source4: ''
    clock_source5: ''
    clock_source6: ''
    clock_source7: ''
    comment: "Add \"rtl,bias=1\" to \nDevice Arguments arguments \nto turn on the\
      \ bias T\nTune to 1575.42 MHz for GPS L1"
    corr0: '0'
    corr1: '0'
    corr10: '0'
    corr11: '0'
    corr12: '0'
    corr13: '0'
    corr14: '0'
    corr15: '0'
    corr16: '0'
    corr17: '0'
    corr18: '0'
    corr19: '0'
    corr2: '0'
    corr20: '0'
    corr21: '0'
    corr22: '0'
    corr23: '0'
    corr24: '0'
    corr25: '0'
    corr26: '0'
    corr27: '0'
    corr28: '0'
    corr29: '0'
    corr3: '0'
    corr30: '0'
    corr31: '0'
    corr4: '0'
    corr5: '0'
    corr6: '0'
    corr7: '0'
    corr8: '0'
    corr9: '0'
    dc_offset_mode0: '0'
    dc_offset_mode1: '0'
    dc_offset_mode10: '0'
    dc_offset_mode11: '0'
    dc_offset_mode12: '0'
    dc_offset_mode13: '0'
    dc_offset_mode14: '0'
    dc_offset_mode15: '0'
    dc_offset_mode16: '0'
    dc_offset_mode17: '0'
    dc_offset_mode18: '0'
    dc_offset_mode19: '0'
    dc_offset_mode2: '0'
    dc_offset_mode20: '0'
    dc_offset_mode21: '0'
    dc_offset_mode22: '0'
    dc_offset_mode23: '0'
    dc_offset_mode24: '0'
    dc_offset_mode25: '0'
    dc_offset_mode26: '0'
    dc_offset_mode27: '0'
    dc_offset_mode28: '0'
    dc_offset_mode29: '0'
    dc_offset_mode3: '0'
    dc_offset_mode30: '0'
    dc_offset_mode31: '0'
    dc_offset_mode4: '0'
    dc_offset_mode5: '0'
    dc_offset_mode6: '0'
    dc_offset_mode7: '0'
    dc_offset_mode8: '0'
    dc_offset_mode9: '0'
    freq0: 1575.42e6
    freq1: 100e6
    freq10: 100e6
    freq11: 100e6
    freq12: 100e6
    freq13: 100e6
    freq14: 100e6
    freq15: 100e6
    freq16: 100e6
    freq17: 100e6
    freq18: 100e6
    freq19: 100e6
    freq2: 100e6
    freq20: 100e6
    freq21: 100e6
    freq22: 100e6
    freq23: 100e6
    freq24: 100e6
    freq25: 100e6
    freq26: 100e6
    freq27: 100e6
    freq28: 100e6
    freq29: 100e6
    freq3: 100e6
    freq30: 100e6
    freq31: 100e6
    freq4: 100e6
    freq5: 100e6
    freq6: 100e6
    freq7: 100e6
    freq8: 100e6
    freq9: 100e6
    gain0: '50'
    gain1: '10'
    gain10: '10'
    gain11: '10'
    gain12: '10'
    gain13: '10'
    gain14: '10'
    gain15: '10'
    gain16: '10'
    gain17: '10'
    gain18: '10'
    gain19: '10'
    gain2: '10'
    gain20: '10'
    gain21: '10'
    gain22: '10'
    gain23: '10'
    gain24: '10'
    gain25: '10'
    gain26: '10'
    gain27: '10'
    gain28: '10'
    gain29: '10'
    gain3: '10'
    gain30: '10'
    gain31: '10'
    gain4: '10'
    gain5: '10'
    gain6: '10'
    gain7: '10'
    gain8: '10'
    gain9: '10'
    gain_mode0: 'False'
    gain_mode1: 'False'
    gain_mode10: 'False'
    gain_mode11: 'False'
    gain_mode12: 'False'
    gain_mode13: 'False'
    gain_mode14: 'False'
    gain_mode15: 'False'
    gain_mode16: 'False'
    gain_mode17: 'False'
    gain_mode18: 'False'
    gain_mode19: 'False'
    gain_mode2: 'False'
    gain_mode20: 'False'
    gain_mode21: 'False'
    gain_mode22: 'False'
    gain_mode23: 'False'
    gain_mode24: 'False'
    gain_mode25: 'False'
    gain_mode26: 'False'
    gain_mode27: 'False'
    gain_mode28: 'False'
    gain_mode29: 'False'
    gain_mode3: 'False'
    gain_mode30: 'False'
    gain_mode31: 'False'
    gain_mode4: 'False'
    gain_mode5: 'False'
    gain_mode6: 'False'
    gain_mode7: 'False'
    gain_mode8: 'False'
    gain_mode9: 'False'
    if_gain0: '20'
    if_gain1: '20'
    if_gain10: '20'
    if_gain11: '20'
    if_gain12: '20'
    if_gain13: '20'
    if_gain14: '20'
    if_gain15: '20'
    if_gain16: '20'
    if_gain17: '20'
    if_gain18: '20'
    if_gain19: '20'
    if_gain2: '20'
    if_gain20: '20'
    if_gain21: '20'
    if_gain22: '20'
    if_gain23: '20'
    if_gain24: '20'
    if_gain25: '20'
    if_gain26: '20'
    if_gain27: '20'
    if_gain28: '20'
    if_gain29: '20'
    if_gain3: '20'
    if_gain30: '20'
    if_gain31: '20'
    if_gain4: '20'
    if_gain5: '20'
    if_gain6: '20'
    if_gain7: '20'
    if_gain8: '20'
    if_gain9: '20'
    iq_balance_mode0: '0'
    iq_balance_mode1: '0'
    iq_balance_mode10: '0'
    iq_balance_mode11: '0'
    iq_balance_mode12: '0'
    iq_balance_mode13: '0'
    iq_balance_mode14: '0'
    iq_balance_mode15: '0'
    iq_balance_mode16: '0'
    iq_balance_mode17: '0'
    iq_balance_mode18: '0'
    iq_balance_mode19: '0'
    iq_balance_mode2: '0'
    iq_balance_mode20: '0'
    iq_balance_mode21: '0'
    iq_balance_mode22: '0'
    iq_balance_mode23: '0'
    iq_balance_mode24: '0'
    iq_balance_mode25: '0'
    iq_balance_mode26: '0'
    iq_balance_mode27: '0'
    iq_balance_mode28: '0'
    iq_balance_mode29: '0'
    iq_balance_mode3: '0'
    iq_balance_mode30: '0'
    iq_balance_mode31: '0'
    iq_balance_mode4: '0'
    iq_balance_mode5: '0'
    iq_balance_mode6: '0'
    iq_balance_mode7: '0'
    iq_balance_mode8: '0'
    iq_balance_mode9: '0'
    maxoutbuf: '0'
    minoutbuf: '0'
    nchan: '1'
    num_mboards: '1'
    sample_rate: samp_rate
    sync: sync
    time_source0: ''
    time_source1: ''
    time_source2: ''
    time_source3: ''
    time_source4: ''
    time_source5: ''
    time_source6: ''
    time_source7: ''
    type: fc32
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [200, 916.0]
    rotation: 0
    state: true
- name: virtual_sink_0_0_0
  id: virtual_sink
  parameters:
    alias: ''
    comment: ''
    stream_id: G2
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1480, 300.0]
    rotation: 0
    state: true
- name: virtual_sink_0_0_0_0
  id: virtual_sink
  parameters:
    alias: ''
    comment: ''
    stream_id: G1
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1472, 140.0]
    rotation: 0
    state: true

connections:
- [analog_const_source_x_0, '0', digital_scrambler_bb_1_0, '0']
- [analog_const_source_x_0, '0', digital_scrambler_bb_1_0_0, '0']
- [analog_const_source_x_1, '0', blocks_float_to_complex_0, '1']
- [analog_sig_source_x_0, '0', blocks_multiply_xx_0, '1']
- [blocks_char_to_float_0, '0', blocks_float_to_complex_0, '0']
- [blocks_complex_to_mag_0, '0', qtgui_time_sink_x_0_2_0, '0']
- [blocks_delay_0, '0', blocks_delay_0_0, '0']
- [blocks_delay_0_0, '0', blocks_delay_0_0_0, '0']
- [blocks_delay_0_0, '0', blocks_xor_xx_0, '1']
- [blocks_delay_0_0_0, '0', blocks_delay_0_0_0_0, '0']
- [blocks_delay_0_0_0_0, '0', blocks_delay_0_0_0_0_0, '0']
- [blocks_delay_0_0_0_0_0, '0', blocks_delay_0_0_0_0_0_0, '0']
- [blocks_delay_0_0_0_0_0_0, '0', blocks_delay_0_0_0_0_0_0_0, '0']
- [blocks_delay_0_0_0_0_0_0_0, '0', blocks_delay_0_0_0_0_0_1, '0']
- [blocks_delay_0_0_0_0_0_0_0_0, '0', blocks_null_sink_0, '0']
- [blocks_delay_0_0_0_0_0_0_0_0, '0', blocks_xor_xx_0, '0']
- [blocks_delay_0_0_0_0_0_0_0_0, '0', virtual_sink_0_0_0, '0']
- [blocks_delay_0_0_0_0_0_0_0_0_0, '0', blocks_xor_xx_1, '0']
- [blocks_delay_0_0_0_0_0_0_0_0_0, '0', virtual_sink_0_0_0_0, '0']
- [blocks_delay_0_0_0_0_0_0_0_1, '0', blocks_delay_0_0_0_0_0_1_0, '0']
- [blocks_delay_0_0_0_0_0_0_1, '0', blocks_delay_0_0_0_0_0_0_0_0, '0']
- [blocks_delay_0_0_0_0_0_0_1_0, '0', blocks_delay_0_0_0_0_0_0_0_0_0, '0']
- [blocks_delay_0_0_0_0_0_0_2, '0', blocks_delay_0_0_0_0_0_0_0_1, '0']
- [blocks_delay_0_0_0_0_0_1, '0', blocks_delay_0_0_0_0_0_0_1, '0']
- [blocks_delay_0_0_0_0_0_1_0, '0', blocks_delay_0_0_0_0_0_0_1_0, '0']
- [blocks_delay_0_0_0_0_0_2, '0', blocks_delay_0_0_0_0_0_0_2, '0']
- [blocks_delay_0_0_0_0_1, '0', blocks_delay_0_0_0_0_0_2, '0']
- [blocks_delay_0_0_0_1, '0', blocks_delay_0_0_0_0_1, '0']
- [blocks_delay_0_0_1, '0', blocks_delay_0_0_0_1, '0']
- [blocks_delay_0_1, '0', blocks_delay_0_0_1, '0']
- [blocks_float_to_complex_0, '0', blocks_multiply_xx_0_0, '0']
- [blocks_float_to_complex_0, '0', blocks_stream_to_vector_0_0_0, '0']
- [blocks_float_to_complex_0, '0', qtgui_time_sink_x_0_1, '0']
- [blocks_multiply_conjugate_cc_0, '0', fft_vxx_1, '0']
- [blocks_multiply_const_vxx_0, '0', blocks_vector_to_stream_0, '0']
- [blocks_multiply_xx_0, '0', blocks_multiply_xx_0_0, '1']
- [blocks_multiply_xx_0, '0', blocks_stream_to_vector_0_0, '0']
- [blocks_multiply_xx_0_0, '0', low_pass_filter_0, '0']
- [blocks_repeat_0, '0', digital_map_bb_0, '0']
- [blocks_stream_to_vector_0_0, '0', fft_vxx_0_0, '0']
- [blocks_stream_to_vector_0_0_0, '0', fft_vxx_0, '0']
- [blocks_vector_to_stream_0, '0', blocks_complex_to_mag_0, '0']
- [blocks_xor_xx_0, '0', blocks_xor_xx_1, '1']
- [blocks_xor_xx_1, '0', blocks_repeat_0, '0']
- [digital_map_bb_0, '0', blocks_char_to_float_0, '0']
- [digital_scrambler_bb_1_0, '0', blocks_delay_0_1, '0']
- [digital_scrambler_bb_1_0_0, '0', blocks_delay_0, '0']
- [fft_vxx_0, '0', blocks_multiply_conjugate_cc_0, '0']
- [fft_vxx_0_0, '0', blocks_multiply_conjugate_cc_0, '1']
- [fft_vxx_1, '0', blocks_multiply_const_vxx_0, '0']
- [low_pass_filter_0, '0', qtgui_time_sink_x_1, '0']
- [rtlsdr_source_0, '0', blocks_multiply_xx_0, '0']

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  file_format: 1