A Wideband Compressive Receiver for Real-time Signal Detection

A wideband compressive receiver at V/UHF-band is presented. It uses the wideband and high time delay SAW DDL to improve the frequency resolution and scan rate. This type of the DDL has properties of the relative bandwidth of 20 %, the time delay of 49.9 usec, the insertion loss of 38.5 dB, and the time spurious rejection of 36 dB. The presented compressive receiver employs the multiply-convolve structure for real-time frequency measurement. It consists of the RF converter, fast sweep LO, chirp LO, A/D converter, signal processing unit and control unit. The chirp LO is designed by using the two SAW DDLs to improve the chirp linearity and the slope matching to the DDL of the RF converter. The developed system shows the wide instantaneous bandwidth and the fine frequency resolution. This system is useful for monitoring the frequency hopping spread spectrum system suggested to reduce the probability of interference jamming