Abstract:

A novel wideband digital electronic support measure (ESM) receiving technique based on instantaneous frequency measurement (IFM) is proposed. Firstly, a short time Fourier transform (STFT) is put on the input signal. The IFM is realized by fast insertion to the STFT results. Secondly, an instantaneous frequency detection technique is implemented by using multithreshold. Lastly, the output is down sampled according to the detective bandwidth. The difficulty of capturing wideband simultaneous signals in ESM system can be conquered according to this novel receiving technique. Furthermore, the scheme can be expediently implemented in field programmable gate array (FPGA) device due to its regular fabric. Computer simulation results indicate that the detection sensitivity of one signal can reach -5 dB. The right detection rate can overcome 90 percent so as the input signaltonoise ratio (SNR) is in the range of -5 dB to 15 dB. That is 20 dB dynamic range can be got. The simulation results also show that 18 dB double signal simultaneous dynamic range can be achieved by using this scheme.