can record sdr samples, spectrum, rtl_fm demod, postprocessing

needs refactoring

multicapture.py

@@ -1,10 +1,47 @@
+import math
 import time
 import pypredict
 import subprocess
 
+children = []
+
+def pollall():
+    global children
+    try:
+        dead = [child for child in children if child.poll() is not None];
+        for child in dead:
+            children.remove(child)
+    except Exception as e:
+        print "Exception: "+str(e)
+
+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 recordSDR(freq, fname, duration):
+    sdrOffset = -50000
+    sdrRate = 20800*11
+    cmdline = ['rtl_sdr',\
+               '-f', str(freq+sdrOffset),\
+               '-s', str(sdrRate),\
+               fname+'.sdr']
+    runForDuration(cmdline, duration)
+
+
 def decode(fname):
-    cmdline = ['/root/atpdec-1.7/atpdec',fname+'.wav']
-    subprocess.call(cmdline)
+#    cmdline = ['atpdec',fname+'.wav']
+#    subprocess.call(cmdline)
+    cmdline = ['python','-m','cqwx.APT',fname+'X5.wav',fname+'R.png',fname+'F.png']
+    try:
+        children.append(subprocess.Popen(cmdline)) # run in background
+    except OSError as e:
+        print e.strerror
 
 def spectrum(fname,freq,duration):
     flow = freq - 10000
@@ -24,41 +61,48 @@ satellites = [\
 	{'name': 'NOAA-15',\
 	'freq': 137620000,\
 	'postProcess': decode },\
-	{'name': 'OSCAR-50',\
-	 'freq': 436795000,
-         'listen': spectrum,
-        },\
-        {'name': 'ISS',\
-         'freq': 145800000 }\
+        {'name': 'OSCAR-7',\
+         'freq': 145950000, \
+         'listen': recordSDR },\
+        {'name': 'FUNCUBE-1',\
+         'freq': 145950000, \
+         'listen': recordSDR },\
+        {'name': 'OSCAR-29',
+         'freq': 435850000, \
+         'listen': recordSDR },\
+#	{'name': 'OSCAR-50',\
+#	 'freq': 436795000,\
+#        },\
+#        {'name': 'ISS',\
+#         'freq': 145800000 }\
 ]
 	
-sample = '44100'
+sample = '20800'
 wavrate='11025'
-
-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
+wav5rate ='20800'
 
 def recordFM(freq, fname, duration):
     # still experimenting with options - unsure as to best settings
     cmdline = ['rtl_fm',\
                '-f',str(freq),\
                '-s',sample,\
+               '-g', '47',\
                '-F','9',\
-               '-A','fast',\
+#               '-A','fast',\
                '-E','dc',\
                fname+'.raw']
     runForDuration(cmdline, duration)
 
 def transcode(fname):
-    cmdline = ['sox','-t','raw','-r',sample,'-es','-b','16','-c','1','-V1',fname+'.raw',fname+'.wav','rate',wavrate]
-    subprocess.call(cmdline)
-
+#    todolist = [('.wav', wavrate), ('X5.wav', wav5rate)]
+    todolist = [('X5.wav', wav5rate)]
+    for (ext,rate) in todolist:
+        try: 
+            cmdline = ['sox','-t','raw','-r',sample,'-es','-b','16','-c','1','-V1',fname+'.raw',fname+ext,'rate',rate]
+            subprocess.call(cmdline)
+        except OSError, e:
+            print "OSError on :"+" ".join(cmdline)
+            print "OSError:"+e.strerror
 
 def recordWAV(freq,fname,duration):
     recordFM(freq,fname,duration)
@@ -72,6 +116,7 @@ def findNextPass():
             predictions[nextIndex]) 
 
 while True:
+    pollall()
     (sat, (aosTime, losTime)) = findNextPass()
     satName = sat['name']
     freq = sat['freq']