Patent ID: 7411539

Claim:
An Electronic Support Measures system for detecting and identifying radar signals present in an area, comprising: a plurality of antenna sets for receiving the radar signals, each antenna set including at least one antenna and each set covering a sector of the surrounding area; a plurality of receiver front ends, each receiver front end being connected to an antenna set covering a specific sector; a plurality of first band-pass filters connected to a first antenna set, said band-pass filters splitting the signals received from the first antenna set into a number of first sub-bands; a plurality of first low noise preamplifiers, each connected with its input to a first band-pass filter and the output connected to one of a corresponding number of first mixers, said mixers being adapted to convert a first sub-band into an Intermediate Frequency (1 st IF), the output from each first mixer being fed to a second band-pass filter tuned to the frequency of said Intermediate Frequency, an output of said second band-pass filters being connected to a first adder, said adder being adapted to combine the signals from the second band-pass filters into a common Intermediate Frequency channel; a plurality of receiver second stages, each connected to a receiver front end and receiving said common intermediate frequency channel, said intermediate frequency channel being fed to a number of third band-pass filters in order to split said common intermediate frequency channel into a number of second sub-bands, the output of each third band-pass filter being fed to a second amplifier, the output of the second amplifier being fed to a second mixer, said second mixer being adapted to convert said intermediate frequency channel into baseband, the output of the second mixer being fed to a fourth band-pass filter, the outputs of all fourth band-pass filters being fed to a second adder, said second adder being adapted to combine the signals received from the fourth band-pass filters into a common baseband channel; and, an Analog-to-Digital converter connected to said second adder and being adapted to digitize the signals received from said second adder, a signal processing unit receiving the signal from the Analog-to-Digital converter.