一种多普勒宽容的多址波形

提出了一种具有多址特性、对多普勒宽容的主动波形．HFM-Costas波形。这种波形是通过将宽带双曲调频波形在时间上切分为子脉冲，再根据Costas阵列编码重新排列而成．它结合了Costas编码的多址特性和双曲调频信号的多普勒宽容性。这种波形适于采用相干．非相干混合接收机进行处理，接收机结构简单，计算量小，检测鲁棒性好。详细说明了这种波形的生成方法、相应混合接收机结构，并分析了该波形的主要特性。最后．通过湖上试验进行了验证。

A multiaddress waveform with Doppler tolerance

A mulitaddress waveform with Doppler tolerance called HFM-Costas waveform is proposed. It is generated by cutting a broadband HFM （hyperbolic frequency modulation） waveform into a sequence of sub-pulses with equal length and rearranging together according to a selected Costas array code. The combined waveform inherits the multiaddress feature of Costas code and the Doppler tolerance characteristic of HFM waveform. The waveform can be detected by using a combined receiver with coherentnocoherent structure which is simple, cost effective and robust in performance. This work first details the technique of generating the waveform along with the combined receiver, and then analyses the major properties of the waveform which are finally verified with real data from a lake trial.