Patent ID: 8428532
Filing Date: 2013-04-23
Classification: G01S,H03H

Abstract:
1. A high frequency receiver having a receive subsystem comprising: a low noise amplifier followed by processing stages with analogue-to-digital conversion, wherein an analogue-to-digital converter is configured to work on the output from the low noise amplifier at a selected rate (F a complex digital low-pass filter with a chosen cut-off frequency, said filter configured to operate on the input memory to supply N filtered digital samples, an M-periodic summer of the N filtered digital samples, said summer configured to supply M filtered and summed digital samples, an M×M discrete Fourier transform stage operating on the M filtered and summed digital samples, wherein the digital signals on the M outputs of the Fourier transform representing M separate channels of a width defined by the cut-off frequency of the low-pass filter, a channelling stage configured to aggregate over time the digital signals at the M outputs of the Fourier transform stage, and a demodulation stage configured to demodulate the aggregated channels and recover the original signal on each channel wherein the demodulation stage comprises an extrapolation of the tangent arc demodulation stage.