Digital receiver techniques in radar detectors

摘要

A method and apparatus are provided for detecting a RADAR signal. RADAR channel data in a frequency range is received, where the frequency range is divided into a plurality of equally wide channels. The received RADAR channel data is digitally processed and analyzed to identify a signal in the RADAR channel data in the frequency range. The frequency range is advanced to a next channel of the plurality of channels, where the frequency range of the next channel of the plurality of channels is nonsequential with the frequency range of the first channel. The steps of receiving, processing, and analyzing are repeated for the next channel of the plurality of channels.

主权项

1. A method of detecting a RADAR signal, comprising:
receiving RADAR channel data for a first channel having a frequency range in one of an X, K and Ka frequency band, by tuning one or more local oscillators of a superheterodyne receiver to frequency shift the frequency range of the first channel to a zero Hertz centered baseband, and passing the output of the superheterodyne receiver through a low pass filter having a bandwidth no less than 10 MegaHertz to produce a baseband-only signal; sampling the baseband-only signal with an analog to digital converter to produce received RADAR channel data in the form of a time-domain sampled representation of the baseband-only signal; analyzing the received channel data to identify a RADAR signal in the RADAR channel data in the frequency range of the first channel; tuning the local oscillators of the superheterodyne receiver to advance to a next channel having a frequency range in the same one of the X, K and Ka frequency bands as the first channel, and which is nonsequential with the frequency range of the first channel; and then repeating the steps of receiving, sampling, and analyzing for the next channel, and then tuning the local oscillators of the superheterodyne receiver to advance to at least one additional channel, the at least one additional channel having a frequency range in the same one of the X, K and Ka frequency bands as the first channel, and which is between the frequency ranges of the first and next channels, and then repeating the steps of receiving, sampling and analyzing for the at least one additional channel, wherein the steps of analyzing the processed channel data of the first channel, next channel and at least one additional channel are performed prior to analyzing frequency ranges not between the frequency ranges of the first and additional channels.