56 lines
1.7 KiB
Python
Executable File
56 lines
1.7 KiB
Python
Executable File
import time
|
|
import pypredict
|
|
import subprocess
|
|
|
|
satellites = ['NOAA-18','NOAA-19','NOAA-15']
|
|
freqs = [137912500, 137100000, 137620000]
|
|
|
|
def runForDuration(cmdline, duration):
|
|
try:
|
|
child = subprocess.Popen(cmdline)
|
|
time.sleep(duration)
|
|
child.terminate()
|
|
except OSError as e:
|
|
print "OS Error during command: "+" ".join(cmdline)
|
|
print "OS Error: "+e.strerror
|
|
|
|
def recordFM(freq, fname, duration):
|
|
cmdline = ['rtl_fm','-f',str(freq),'-s','44100','-g','40',fname+'.raw']
|
|
runForDuration(cmdline, duration)
|
|
|
|
def transcode(fname):
|
|
cmdline = ['sox','-t','raw','-r','44100','-es','-b','16','-c','1','-V1',fname+'.raw',fname+'.wav','rate','11025']
|
|
subprocess.call(cmdline)
|
|
|
|
def recordWAV(freq,fname,duration):
|
|
recordFM48k(freq,fname,duration)
|
|
transcode(fname)
|
|
|
|
def spectrum(fname,duration):
|
|
cmdline = ['rtl_power','-f','137000000:138000000:1000','-i','1m','-g','40',fname+'.csv']
|
|
runForDuration(cmdline,duration)
|
|
|
|
def findNextPass():
|
|
predictions = [pypredict.aoslos(s) for s in satellites]
|
|
aoses = [p[0] for p in predictions]
|
|
nextIndex = aoses.index(min(aoses))
|
|
return (satellites[nextIndex],\
|
|
freqs[nextIndex],\
|
|
predictions[nextIndex])
|
|
|
|
while True:
|
|
(satName, freq, (aosTime, losTime)) = findNextPass()
|
|
now = time.time()
|
|
towait = aosTime-now
|
|
if towait>0:
|
|
print "waiting "+str(towait)+" seconds for "+satName
|
|
time.sleep(towait)
|
|
# dir= sat name and filename = start time
|
|
fname='./'+satName+'/'+str(aosTime)
|
|
print "beginning pass "+fname+" predicted end "+str(losTime)
|
|
recordWAV(freq,fname,losTime-aosTime)
|
|
# spectrum(fname,losTime-aosTime)
|
|
print "finished pass "+fname+" at "+str(time.time())
|
|
time.sleep(60.0)
|
|
|