Coherent phase-coded pulse train with Doppler cascade-processing for detection of aircraft target in a HF radar

The effect of range-Dapper coupling caused by aircraft moving at very high speed makes trouble on selection of waveform parameters by using frequency-modulated interrupted continuous wave (FNHCW) or frequency-coded pulse (FCP). It also limits the increasing of coherent intergration time. In this paper, application of coherent phase-coded pluse train (CPCPT) solves range-Doppler coupling well. Relevant processing of CPCPT consists of three parts: Dopper preprocessing, pulse compression, and Doppler post-processing. The velocity information obtained by Doppler preprocessing is used for better pulse compression and range tracking. Doppler post-processing with range tracking could make longer coherent accumulation for better detection of target and higher velocity resolution. Finally, examples of data simulation are given to demonstrate the achievements mentioned above.