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84 lines
2.2 KiB
84 lines
2.2 KiB
3 years ago
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#!/usr/bin/env python3
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import os
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import sys
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import random
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import datetime as dt
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import subprocess as sp
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from typing import Tuple
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from laika.downloader import download_nav
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from laika.gps_time import GPSTime
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from laika.helpers import ConstellationId
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cache_dir = '/tmp/gpstest/'
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def download_rinex():
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# TODO: check if there is a better way to get the full brdc file for LimeGPS
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gps_time = GPSTime.from_datetime(dt.datetime.utcnow())
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utc_time = dt.datetime.utcnow() - dt.timedelta(1)
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gps_time = GPSTime.from_datetime(dt.datetime(utc_time.year, utc_time.month, utc_time.day))
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return download_nav(gps_time, cache_dir, ConstellationId.GPS)
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def get_random_coords(lat, lon) -> Tuple[int, int]:
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# jump around the world
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# max values, lat: -90 to 90, lon: -180 to 180
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lat_add = random.random()*20 + 10
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lon_add = random.random()*20 + 20
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lat = ((lat + lat_add + 90) % 180) - 90
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lon = ((lon + lon_add + 180) % 360) - 180
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return round(lat, 5), round(lon, 5)
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def check_availability() -> bool:
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cmd = ["LimeSuite/builddir/LimeUtil/LimeUtil", "--find"]
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output = sp.check_output(cmd)
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if output.strip() == b"":
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return False
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print(f"Device: {output.strip().decode('utf-8')}")
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return True
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def main():
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if not os.path.exists('LimeGPS'):
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print("LimeGPS not found run 'setup.sh' first")
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return
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if not os.path.exists('LimeSuite'):
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print("LimeSuite not found run 'setup.sh' first")
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return
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if not check_availability():
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print("No limeSDR device found!")
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return
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rinex_file = download_rinex()
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lat, lon = get_random_coords(47.2020, 15.7403)
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if len(sys.argv) == 3:
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lat = float(sys.argv[1])
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lon = float(sys.argv[2])
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try:
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print(f"starting LimeGPS, Location: {lat},{lon}")
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cmd = ["LimeGPS/LimeGPS", "-e", rinex_file, "-l", f"{lat},{lon},100"]
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sp.check_output(cmd, stderr=sp.PIPE)
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except KeyboardInterrupt:
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print("stopping LimeGPS")
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except Exception as e:
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out_stderr = e.stderr.decode('utf-8')# pylint:disable=no-member
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if "Device is busy." in out_stderr:
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print("GPS simulation is already running, Device is busy!")
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return
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print(f"LimeGPS crashed: {str(e)}")
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print(f"stderr:\n{e.stderr.decode('utf-8')}")# pylint:disable=no-member
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if __name__ == "__main__":
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main()
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