A real-time recognition method of radar intra-pulse modulation in EW digital receiver
Li Ta · Modern Electronics Technique · 2013
In order to automatically recognize different modulation types of radar pulses in EW digital receiver,a practical method of modulation recognition based on FPGA is proposed. Firstly,the frequency conversion preprocessing of high-speed intermediate frequency direct acquisition signal is performed. LFM and FSK signals are distinguished by the rough recognition based on frequency characteristic. Then baseband PSK signals sampled at the low speed are precisely recognized with a new algorithm of instantaneous autocorrelation to get phase difference. The method has good real-time performance and high reliability,and can meet the need of high sampling rate EW digital receivers if it is implemented on FPGA.