DJI DroneID frame detector — Mini 2 recording
Detects DroneID frames in the public 50 MS/s DJI Mini 2 IQ artifact by correlating its root-600 Zadoff-Chu preamble. Message Debug counts the ten curated bursts in this file. In a continuous recording, successive "Found burst" sample offsets should be about 9,830,400 samples apart at 15.36 MS/s (roughly 640 ms); this shortened artifact does not preserve that cadence.
- Author Marc
- Category DroneID
- Blocks 18
- Connections 14
- File
droneid/droneid_mini_2.grc
Blocks used
| Block | Module | Used |
|---|---|---|
| Variable | GNU Radio | 5 |
| Complex to Mag^2 | GNU Radio | 1 |
| Constant Source | GNU Radio | 1 |
| Delay | GNU Radio | 1 |
| extractor | gr-droneid | 1 |
| Head | GNU Radio | 1 |
| Message Counter | gr-satellites | 1 |
| Message Debug | GNU Radio | 1 |
| Multiply | GNU Radio | 1 |
| normalized_xcorr_estimate | gr-droneid | 1 |
| Public HTTP Recording | GNU Radio | 1 |
| Rational Resampler | GNU Radio | 1 |
| Signal Source | GNU Radio | 1 |
| Stream Mux | GNU Radio | 1 |
Flowgraph source
droneid/droneid_mini_2.grc
options:
parameters:
author: Marc
copyright: ''
description: Detects DroneID frames in the public 50 MS/s DJI Mini 2 IQ artifact by correlating its root-600 Zadoff-Chu preamble. Message Debug counts the ten curated bursts in this file. In a continuous recording, successive "Found burst" sample offsets should be about 9,830,400 samples apart at 15.36 MS/s (roughly 640 ms); this shortened artifact does not preserve that cadence.
generate_options: qt_gui
id: DJI_DroneID_frame_detector___Mini_2_recording
title: "DJI DroneID frame detector \u2014 Mini 2 recording"
states:
coordinate: [10, 10]
rotation: 0
state: enabled
blocks:
- name: capture_rate
id: variable
parameters:
comment: ''
value: '50000000'
states:
coordinate: [600, 10]
rotation: 0
state: enabled
- name: channel_offset
id: variable
parameters:
comment: ''
value: '9619140.625'
states:
coordinate: [780, 10]
rotation: 0
state: enabled
- name: droneid_rate
id: variable
parameters:
comment: ''
value: '15360000'
states:
coordinate: [1000, 10]
rotation: 0
state: enabled
- name: padding_samples
id: variable
parameters:
comment: ''
value: '30000'
states:
coordinate: [1180, 10]
rotation: 0
state: enabled
- name: recording_samples
id: variable
parameters:
comment: ''
value: '727500'
states:
coordinate: [1400, 10]
rotation: 0
state: enabled
- name: align_frame_start
id: blocks_delay
parameters:
affinity: ''
alias: ''
comment: ''
delay: '6439'
maxoutbuf: '0'
minoutbuf: '0'
type: complex
states:
coordinate: [470, 440]
rotation: 0
state: enabled
- name: append_padding
id: blocks_stream_mux
parameters:
affinity: ''
alias: ''
comment: ''
lengths: '[recording_samples, padding_samples]'
maxoutbuf: '0'
minoutbuf: '0'
num_inputs: '2'
type: complex
vlen: '1'
states:
coordinate: [670, 160]
rotation: 0
state: enabled
- name: channel_shift
id: analog_sig_source_x
parameters:
affinity: ''
alias: ''
amplitude: '1'
comment: ''
frequency: -channel_offset
maxoutbuf: '0'
minoutbuf: '0'
samp_rate: capture_rate
type: complex
waveform: analog.GR_COS_WAVE
states:
coordinate: [670, 280]
rotation: 0
state: enabled
- name: correlation_power
id: blocks_complex_to_mag_squared
parameters:
affinity: ''
alias: ''
comment: ''
maxoutbuf: '0'
minoutbuf: '0'
states:
coordinate: [470, 540]
rotation: 0
state: enabled
- name: detect_frames
id: droneid_extractor
parameters:
affinity: ''
alias: ''
comment: ''
maxoutbuf: '0'
minoutbuf: '0'
sample_rate: droneid_rate
threshold: '0.15'
states:
coordinate: [830, 440]
rotation: 0
state: enabled
- name: detection_count
id: satellites_message_counter
parameters:
affinity: ''
alias: ''
comment: ''
maxoutbuf: '0'
minoutbuf: '0'
states:
coordinate: [1190, 440]
rotation: 0
state: enabled
- name: mixer
id: blocks_multiply_xx
parameters:
affinity: ''
alias: ''
comment: ''
maxoutbuf: '0'
minoutbuf: '0'
num_inputs: '2'
type: complex
vlen: '1'
states:
coordinate: [1050, 170]
rotation: 0
state: enabled
- name: padding_head
id: blocks_head
parameters:
affinity: ''
alias: ''
comment: ''
maxoutbuf: '0'
minoutbuf: '0'
num_items: padding_samples
type: complex
states:
coordinate: [300, 290]
rotation: 0
state: enabled
- name: preamble_correlator
id: droneid_normalized_xcorr_estimate
parameters:
affinity: ''
alias: ''
comment: ''
maxoutbuf: '0'
minoutbuf: '0'
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