一类具有低距离旁瓣的多相码“波形对”

A Kind of Polyphase Coded"Waveform Pair" with Low-Range Sidelobe

本文在文献［１］研究Ｐ码波形自相关函数旁瓣结构的基础上，从Ｐ码波形导出了一类能实现低距离旁瓣的多相码“波形对”。在零多普勒频移的条件下，该类“波形对”能以少量信噪比损失为代价使脉压输出波形的主旁瓣比与码序列长度相等，也就是说，从主旁瓣比的角度讲，该类“波形对”可以等效为相应长度的多相巴克码波形。另外，我们还研究了该类“波形对”的多普勒特性，数字仿真结果表明，由Ｐ３或Ｐ４码导出的“波形对”脉压结果的主旁瓣比对多普勒不敏感，在ｆｄ＝０～０．０５Ｂ范围内，最大Ｓ／Ｎ损失为３ｄＢ，最小Ｓ／Ｎ损失为０．８７ｄＢ，呈现周期性。

Based on the result about the sidelobe structure of the compressed waveform autocorrelation function in literature[1], this paper derives a kind of polyphase coded' waveform Pair' from FM-derived Polyphase coded waveforms. Under the condition of zero Doppler frequency shifts,this kind of a waveform pair' is equivalent to Polyphase Barker coded waveform at a small amount of loss in signal-to-noise ratio and widening of the bottom of mainlobe. Finally, computer simulation results show that Doppler property of this 'waveform pair' is superior to that of the corresponding FM-derived polyphase code waveform