[6] [6] LORD R T. Aspects of stepped-frequency processing for low frequency systems［D］. Cape Town:University of Cape Town2000.

[7] [7] LEVANAN N, MOZESON E.Nullifying ACF grating lobes in stepped-frequency train of LFM pulses［J］.IEEE Transactions on Aerospace and Electronics Systems, 2003, 39(2):694-703.

[8] [8] JING W, YANG L, TENG L.Processing method base on synthetic spectrum using stepped-frequency chirps［C］//IET International Radar Conference, 2009:1-4.

[9] [9] ZHANG L, GAO Z Z. Stepped-frequency waveform processing for moving target based on genetic-CLEAN algorithm［C］//The 2nd International Conference on Signal Processing Systems2010:18-21.

[10] [10] ZHAO X N, LIU H B, LIU Q B, et al. Parameters design and signal processing algorithm research in clutter based on the stepped frequency waveforms［C］//The 11th International Conference on Signal Processing,2012:1900-1904.

[11] [11] ZHAO L Z, FU X J, WU J T, et al.A novel range profiles splicing approach in stepped-frequency radars［C］//IET International Radar Conference, 2013:1-5.

[12] [12] NGUYEN L. Signal processing techniques for stepped frequency ultra-wideband radar［J］. Proceedings of SPIE, 2014.doi:10.1117/12.2053026.