Let me show you the way – how I try to solve the TLE lottery.
A very good example is MASAT-1 – which is sending a (nearly) continously signal.
Today I choosed a high elevation pass (89 deg) where the doppler shift should be significant.
I recorded the complete pass with my SDR-IQ without doppler correction.
For post analysis of the pass I play back the recorded pass with SpectraVue. My software calculate the correct frequency to the same time as in the recorded file and set the center frequency in SpectraVue. My graphs showing the demodulated audio signal. If a TLE match perfect you should hear a constant tone – and you’ll see a line. If the TLE does not match you can hear the deviation of the audio signal (lower/higher tone).
In the following pictures you can see the simulation of this pass with the latest keps (space-track – epoch time 46.48471756).
You can see the doppler shift of the audio signal and which TLE is the best match. So for MASAT-1 my favourite is OBJECT D…