Added support for spectogram

station/Makefile

@@ -0,0 +1,2 @@
+install:
+	cp baseband_spectogram.py /usr/local/bin/

station/tools/baseband_spectogram.py

@@ -0,0 +1,42 @@
+#!/usr/bin/env python
+# Simple spectogram ploter
+
+import argparse
+import numpy as np
+import matplotlib.pyplot as plt
+
+if __name__ == '__main__':
+    cliParser = argparse.ArgumentParser(description='Simple spectogram ploter')    
+    
+    cliParser.add_argument('input_file',  type=str, help='input filename')
+    cliParser.add_argument('output_file', type=str, help='output filename')
+    cliParser.add_argument('-fs', '--sampleRate',  type=float, help='sets the sample rate [hz]')    
+    cliParser.add_argument('-fc', '--centralFreq', type=float, help='sets the sample rate [hz]')    
+    
+    cliParser.add_argument('-f', '--format', type=str, 
+        help='Output format', 
+        choices=["int8"],
+        default='int8')
+
+    args = cliParser.parse_args()
+    
+    data = np.fromfile(args.input_file, dtype=args.format)
+    
+    data = data[1::2] + 1j * data[0::2]
+    
+    fft_size    = 1024
+    sample_rate = args.sampleRate
+    Fc          = args.centralFreq
+    num_rows    = len(data) // fft_size # // is an integer division which rounds down
+    
+    spectrogram = np.zeros((num_rows, fft_size))
+    
+    for i in range(num_rows):
+        spectrogram[i,:] = 10 * np.log10(np.abs(np.fft.fftshift(np.fft.fft(data[i*fft_size:(i+1)*fft_size])))**2)
+        
+    fig = plt.figure(figsize=(5, num_rows / sample_rate * 20))
+    
+    plt.imshow(spectrogram, cmap=plt.get_cmap('winter'), aspect='auto', extent = [sample_rate/-2/1e6 + Fc/1e6, sample_rate/2/1e6 + Fc/1e6, 0, len(data)/sample_rate], vmin=0, vmax=np.max(spectrogram))
+    plt.xlabel("Frequency [MHz]")
+    plt.ylabel("Time [s]")
+    plt.savefig(args.output_file) 

web/seeds.php

@@ -109,6 +109,7 @@
     $aptPipe->name->set("NOAA APT");
     $aptPipe->pipe->set([
         "satdump noaa_apt baseband {baseband} {artefactDir} --samplerate {fs} --satellite_number {targetNum} --start_timestamp {start} --autocrop_wedges --baseband_format s8",
+        "baseband_spectogram.py {baseband} {artefactDir}/spectogram.png -fs {fs} -fc {freq}",
         "cp {baseband} {artefactDir}/{freq}_{fs}.s8"
     ]);
 
@@ -118,6 +119,7 @@
     $lrptPipe->name->set("METEOR LRPT");
     $lrptPipe->pipe->set([
         "satdump meteor_m2-x_lrpt baseband {baseband} {artefactDir} --samplerate {fs} --baseband_format s8",
+        "baseband_spectogram.py {baseband} {artefactDir}/spectogram.png -fs {fs} -fc {freq}",
         "cp {baseband} {artefactDir}/{freq}_{fs}.s8"
     ]);
 
@@ -234,7 +236,7 @@
     $noaa15APT->target->set($noaa15);
     $noaa15APT->dataType->set($avhrrType);
     $noaa15APT->bandwidth->set(34000);
-    $noaa15APT->centerFrequency->set(137500000);
+    $noaa15APT->centerFrequency->set(137620000);
     $noaa15APT->modulation->set($apt);
     $noaa15APT->antenna->set($qfh);
     $noaa15APT->priority->set(0);