一种非相干扩频信号跟踪中HPK-P位同步捕获法  

A Half-period Kokkonen-Pietila(HPK-P)Bit Synchronization Capture Method for Incoherent Spread Spectrum Signal Tracking

作　　者：胡一皓 刘才瑞 王晋阳 曾艳文 梁显锋 HU Yihao;LIU Cairui;WANG Jinyang;ZENG Yanwen;LIANG Xianfeng(National Space Science Center,Chinese Academy of Sciences,Beijing 100190,China;School of Electronic,Electrical and Communication Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;College of Physical Science and Technology,Central China Normal University,Wuhan 430079,China)

机构地区：[1]中国科学院国家空间科学中心,北京100190 [2]中国科学院大学电子电气与通信工程学院,北京100049 [3]华中师范大学物理科学与技术学院,武汉430079

出　　处：《电讯技术》2024年第5期748-753,共6页Telecommunication Engineering

基　　金：国家重点研发计划(2021YFC2800203)。

摘　　要：星载非相干扩频应答机在接收非相干扩频信号时,特别是在低信噪比条件下,信号跟踪环路中积分结果会因比特翻转而衰减严重,从而影响跟踪环路性能。针对上述问题,提出了一种HPK-P(Half-period Kokkonen-Pietila)位同步捕获法,将位同步时钟捕获精度缩短至半个伪码周期长,降低积分值衰减量,提高了跟踪前期的环路性能。仿真结果表明,与K-P法、半周期直方图法相比,HPK-P法更适合-24 dB低信噪比下的环路跟踪。在现场可编程门阵列(Field Programmable Gate Array,FPGA)上对HPK-P法进行测试,在信噪比为-24 dB,多普勒频偏范围为±1.5 kHz,多普勒加速度为+2.5 kHz/s条件下验证了该设计的可行性。When receiving non-coherent spread spectrum signals,especially under low signal-to-noise ratio(SNR)conditions,the integration results in the signal tracking of the spaceborne non-coherent spread spectrum responders will decay severely due to bit flipping,which affects the performance of the tracking loop.To solve the above problem,a Half-period Kokkonen-Pietila(HPK-P)bit synchronization capture method is proposed,which shortens the bit synchronization clock capture accuracy to half a length of pseudocode period,reduces the attenuation of the integration value and improves the performance in the early stage of the tracking loop.Through simulation,the HPK-P method is compared with the K-P method and half-period histogram method,and the results show that HPK-P method is more suitable for loop tracking under the SNR of-24 dB.The feasibility of this design has been verified on field programmable gate array(FPGA)by testing HPK-P method under the conditions of Doppler range of±1.5 kHz and Doppler acceleration of±2.5 kHz/s when the SNR is-24 dB.

关 键 词：非相干扩频 信号跟踪 HPK-P 位同步 

分 类 号：TN914.4[电子电信—通信与信息系统]