A pulse compression processor implementation with DSP for airborne pulse Doppler radar

In this paper, we describe a pulse compressor implementation with DSP for small time-bandwidth (TB) product linear frequency modulation (LFM) waveform. It contains the digital generation of the LFM waveform and the digital internally Hamming weighted compression filter. Two methods for suppression of time sidelobe of the digital pulse compressor are employed. First, the LFM waveform is modified using cubic phase predistortion for reducting the effect of Fresnel ripples in small TB product LFM waveform. Secondly, anti-aliasing filter is used before A/D converter for reducting spectrum skirt level of the returned LFM waveform. The parameters of the compression filter implemented with IMSA100 DSP are programmable. The experiments show that the peak time sidelobe level of the digital pulse compressor is not larger than -32 dB for TB product of 20