高动态环境下高阶双二进制偏移载波信号的精确捕获  

Accurate Acquisition of High Order Double Binary Offset Carrier Signals for High Dynamic Environment

作　　者：张天骐[1] 袁帅 刘董华 李群 ZHANG Tianqi, YUAN Shuai, LIU Donghua ,LI Qun(Chongqing Key Laboratory of Signal and Information Processing, Chongqing University of Posts and Telecommunications, Chongqing 400065, China)

机构地区：[1]重庆邮电大学信号与信息处理重庆市重点实验室,重庆400065

出　　处：《电子与信息学报》2018年第11期2728-2735,共8页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(61671095;61371164;61702065;61701067;61771085);信号与信息处理重庆市市级重点实验室建设项目(CSTC2009CA2003);重庆市研究生科研创新项目(CYS17219);重庆市教育委员会科研项目(KJ1600427;KJ1600429)~~

摘　　要：针对高动态环境下双二进制偏移载波(DBOC)调制信号无法精确捕获的问题,该文提出一种基于部分匹配滤波结合快速傅里叶变换(PMF-FFT)的捕获方法。又针对捕获过程中相关损失和扇贝损失引起的检测性能降低问题,提出一种改进的捕获方法。该方法首先利用离散多项式相位变换(DPT)去除接收信号的高阶动态项,然后针对DBOC信号重新设计PMF-FFT算法;最后利用频谱校正法对FFT后的功率谱最大值进行校正。仿真结果表明,在同一条件下,该方法将检测概率提高了2 dB左右,并且有效缩短了捕获时间。For the problem of without accurate acquisition of Double Binary Offset Carrier （DBOC） modulated sigual for high dynamic environment, a method which is based on Partial Matched Filtering （PMF） - Fast Fourier Transform （FFT） is proposed. According to the problem of low detection performance caused by the related loss and scallop loss, a new improved acquisition scheme is proposed. Firstly, the Discrete Polynomial phase Transform （DPT） is used to remove the high order dynamic term of the received signal, and then the PMF-FFT algorithm is redesigned for the DBOC signal. Finally, the spectrum correction method is used to correct the maximmn power spectrum after FFT. Simulation results show that, under the same conditions, the proposed scheme improves the detection probability by about 2 dB, and shortens effectively the acquisition time.

关 键 词：信号处理 高动态环境 双二进制偏移载波 离散多项式相位变换 频谱校正 部分匹配滤波-快速傅里叶变换 

分 类 号：TN911[电子电信—通信与信息系统]