PCSS通信测距复合系统中一种改进的映射方法

为了提高通信测距复合系统的信息传输速率，实现数据与序列的完全映射，将并行组合扩频技术（parallel combinatory spread spectrum,PCSS）应用于复合系统,提出了一种改进的r_组合数据序列映射方法。在发送端采用所提出的映射方法实现数据的扩频传输，在接收端采用改进的广义互相关算法进行时延估计和数据解扩,同时实现了信息传输和距离测量。仿真结果表明，改进的数据序列映射方法实现了映射的唯一性，提高了数据的映射效率，提升了PCSS通信测距复合系统的信息传输速率；改进的广义互相关算法在低信噪比下具有更好的时延估计性能。因此，所提方法能使PCSS通信测距复合系统更有效地完成测距任务和通信任务,可为通信测距复合系统的理论研究和工程应用提供参考。

An improved sequence mapping method in PCSS communication and ranging composite system

In order to improve the information transmission rate of the communication and ranging composite system and realize the complete data-sequence mapping,the parallel combinatory spread spectrum (PCSS) technology was applied to the composite system,so that an improved r_combinatory data-sequence mapping method was proposed.The proposed mapping method was used to implement the data spreading transmission at the transmitter,and an improved generalized cross-correlation algorithm was adopted to estimate the transmission time delay and data despreading at the receiver then the information transmission and distance measuring were implemented at the same time.The simulation results show that the improved data-sequence mapping method realizes the uniqueness of mapping,improves the data mapping efficiency and the information transmission rate of the PCSS communication and ranging composite system.The improved generalized cross-correlation algorithm has better delay estimation performance under low signal-to-noise ratio (SNR).Therefore,the proposed method makes the PCSS communication and ranging composite system accomplish ranging tasks and communication tasks more effectively,which provides a reference for the theoretical research and engineering application of the composite system.