一种延迟偏移的二进制正交线性调频信号调制方法

A Binary Orthogonal Chirp Signal Modulation Method with Delay Offset

在低时间带宽积条件下,二进制正交键控(BOK)匹配检测存在正负调频斜率互干扰和自匹配旁瓣幅度大的问题。为此,提出一种新的延迟偏移Chirp-BOK调制方法。通过在正负调频斜率符号间加入延迟偏移量,减少正负调频斜率信号间的互干扰,从而抑制旁瓣,提高峰值旁瓣比。对该调制方法的最佳延迟偏移量进行工程求解和仿真分析,结果表明,与窗函数加权旁瓣抑制方法相比,该方法在低时间带宽积条件下不改变Chirp匹配脉压滤波器的结构和带宽,大幅提高了系统检测性能。

In the case of low Time-Bandwidth（TB） product,there are two problems in the Binary Orthogonal Keying （BOK） matching detection, the mutual interference between the positive and negative frequency modulation slope and the large amplitude of the self-matching sidelobe. In order to solve these problems, a new modulation method of delay offset Chirp-BOK is proposed. It reduces the mutual interference between the positive and negative frequency modulation slope signals by adding delay offset between the positive and negative frequency modulation slope symbols, so as to suppress the sidelobe and improve the Peak-to-Side-Lobes Ratio（PSLR）. Through the engineering solution and simulation analysis for the best delay offset of this method, results show that, when compared with the commonly used side-lobe suppression method by the weighted window function, this method can dramatically improve the system detection performance without changing the structure of the Chirp matched filter and bandwidth under the condition of low TB product.