Abstract: When linear frequency modulation (LFM) segmented pulse compression used to oppose the intermittent sampling jamming, the sub-pulses are sequentially stepped. After the sampling sub-pulses and the adjacent sub-pulses compress, the residual signals accumulate to form an interference band. When suppressing and interfering signals to sample continuously, harmonic components are produced. Aiming at these two problems, an anti-intermittent sampling method based on intra-pulse Costas frequency stepping LFM waveform is proposed. The waveform combines the advantages of LFM and Costas-coding, has an ideal ambiguity function of pin type. It can not only suppress the interference band, but also greatly reduce the harmonic components, ultimately improve the anti-jamming performance. The validity of the method is verified by theoretical deduction and simulation analysis.

Key words: intermittent sampling, segmented pulse compression, anti-jamming method, frequency stepped, Costas-coding