Todd Stellanova tstellanova

overlays=uart-ao-b-on-gpioao-8-gpioao-9

This assumes the prefix line:

overlay_prefix=meson-g12a-radxa-zero

At time of writing, there is not a homebrew formula for installing gnss-sdr on this macos version. These are notes on how I built it from source.

Preliminaries:
- install python using pyenv, set local python to 3.11
- install xcode command line tools
- install Homebrew package manager
Core dependencies (install using homebrew)

brew install cmake volk gnuradio hdf5 protobuf

Notes on the GUPPI Raw Data Format S. Ellingson Nov 1, 2013

This format consists of blocks, with each block consisting of a text header and a raw binary data segment.

An example of a header is shown in the file "header_example.txt". The header ends with the word "END". Some important fields are:

I use this to listen to stereo from KALX using an RTL-SDR.

rtl_fm -M wbfm -f 90.7M -r 64k - |aplay -r 32000 -f S16_LE -t raw -c 2

rtl_fm -M wbfm -f 90.7M -r 64k - | play -t raw -r 32k -es -b 16 -c 2 -V1 -

	import numpy as np
	import matplotlib.pyplot as plt

	# Define the polar equation r = 2*theta
	def polar_to_cartesian(theta):
	r = 2 * theta
	x = r * np.cos(theta)
	y = r * np.sin(theta)
	return x, y

	# some example commands for pulling data from an IP connected PlutoSDR into satdump, on macos


	/Applications/SatDump.app/Contents/MacOS/satdump record gps_L1_test_pluto --source plutosdr --samplerate 10e6 --frequency 1575420000 --baseband_format cs8 --gain_mode hybrid --ip_address 10.0.1.191 --auto_reconnect false --timeout 10

	/Applications/SatDump.app/Contents/MacOS/satdump record gps_L5_test_pluto --source plutosdr --samplerate 10e6 --frequency 1176000000 --baseband_format cs8 --gain_mode hybrid --ip_address 10.0.1.191 --auto_reconnect false --timeout 10

	/Applications/SatDump.app/Contents/MacOS/satdump record gps_L2_test_pluto --source plutosdr --samplerate 10e6 --frequency 1227600000 --baseband_format cs8 --gain_mode hybrid --ip_address 10.0.1.191 --auto_reconnect false --timeout 10

	[GNSS-SDR]

	; tstellanova tested with:
	; gnss-sdr running on rpi4
	; Standard UBX multiband active antenna (includes a preamp/LNA) supplied with +5 VDC power on external bias-tee.
	; Plus an additional HT004a LNA ("30 dB" claimed), powered by USB-C
	; HackRF info:
	; Board ID Number: 4 (HackRF One)
	; Firmware Version: 2024.02.1 (API:1.08)
	; Hardware Revision: r9

	[GNSS-SDR]

	; tstellanova tested with:
	; gnss-sdr running on rpi4
	; Standard UBX multiband active antenna (includes a preamp/LNA) supplied with +5 VDC power on external bias-tee.
	; Plus an additional HT004a LNA ("30 dB" claimed), powered by USB-C
	; HackRF info:
	; Board ID Number: 4 (HackRF One)
	; Firmware Version: 2024.02.1 (API:1.08)
	; Hardware Revision: r9

	#!/usr/bin/env python

	from subprocess import Popen, PIPE, STDOUT
	import re
	import argparse
	import os
	import json
	from datetime import datetime, timezone
	import sigmf
	from sigmf import SigMFFile

	"""
	From a GUPPI .raw file (or set of files),
	extract a single coarse channel's worth of data
	into two separate polarization SigMF file sets
	including both sigmf-data and sigmf-meta files
	for each polarization.

	Based on prior raw2sigmf from https://github.com/greghell/extractor

	first argument = filename of one '.raw' file of the data set