| CPC G01R 31/31709 (2013.01) [G01R 29/26 (2013.01); H04L 1/205 (2013.01); G01R 23/16 (2013.01)] | 20 Claims |
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1. A signal analysis system, comprising:
a memory that stores instructions; and
a processor that executes the instructions, wherein, when executed by the processor, the instructions cause the signal analysis system to:
digitize a radio frequency signal into a digitized radio frequency signal;
transform the digitized radio frequency signal into a first transformed digital signal;
digitally downconvert the digitized radio frequency signal to a first baseband signal;
filter the first baseband signal into a first filtered signal;
transform the first filtered signal into a second transformed digital signal;
compute a first phase noise spectrum from the second transformed digital signal, detect spurs and frequencies corresponding to the spurs in the first phase noise spectrum, and set frequency bins which do not include spurs to zero to generate a modified second transformed digital signal;
inversely transform the modified second transformed digital signal into a first complex time-domain baseband signal via an inverse Fourier transform;
demodulate a first phase signal in the first complex time-domain baseband signal to obtain a first demodulated signal; and
obtain an average of slopes of the first demodulated signal, and obtain an average frequency error from the average of slopes of the first demodulated signal.
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