FAST SIGNAL SURVEYOR

摘要

A system and method for characterizing a received radio frequency (RF) signal. In one embodiment, the system includes an antenna, a tuner, a sampler, a memory, and a processing unit connected to the memory, the processing unit being configured to receive a first sequence of samples from the sampler, perform a fast Fourier transform (FFT) operation, take the absolute value of a shifted complex frequency spectrum, perform a first filtering operation, perform a logarithmic operation, and perform an edge detection process to form an array of carrier centers and an array of carrier bandwidths. The processing unit is further configured to form, for each energy band identified as a result of the edge detection process, estimates of carrier characteristics and estimates of modulation characteristics.

主权项

1. A system for analyzing radio frequency signals, the system comprising:
an antenna; a tuner; a sampler; a memory; and a processing unit connected to the memory, the processing unit being configured to:
receive a first sequence of samples from the sampler for a first polarization state;perform a first fast Fourier transform (FFT) operation on the samples of the first sequence of samples and an FFT shift on a result of the first FFT operation to form a shifted complex frequency spectrum for the first polarization state;take the absolute value of the shifted complex frequency spectrum to form a shifted magnitude spectrum;perform a first filtering operation on the shifted magnitude spectrum to form a decimated and filtered magnitude spectrum;perform a logarithmic operation on the decimated and filtered magnitude spectrum to form a log filtered magnitude spectrum;perform an edge detection process to form an array of carrier centers and an array of carrier bandwidths; andfor a first carrier center of the array of carrier centers and a corresponding first carrier bandwidth:
perform an inverse FFT (IFFT) operation on a subarray of the shifted complex frequency spectrum to form a decimated complex time series for the first carrier, the subarray corresponding to a first range of frequencies, the first range of frequencies being centered on the first carrier, and having a frequency extent substantially equal to the first carrier bandwidth; andstore the decimated complex time series in the memory.