| 摘要: |
| 地基伪卫星系统为克服远近效应影响，通常采用跳时（Time Hopping/Direct Sequence-Code Division Multiple Access，TH/DS-CDMA）信号进行伪距测量与定位，导致接收终端必须增加系统跳时序列相位估计的设计，降低捕获效能的同时也引入了接收终端的捕获复杂度。针对以上问题，提出了一种基于伪卫星跳时信号的联合捕获算法，利用跳时信号的时域正交特性与时隙分配特点，将多基站单脉冲信号捕获结果映射为使能时隙序列，通过循环截断相关完成跳时参数估计，有效缩短了跳时参数估计时间。仿真结果表明，该方法能够正确完成捕获阶段的参数估计，4个伪卫星的联合捕获耗时相较传统方法减少63.32%，为伪卫星跳时信号的快速捕获提供了有效方法。 |
| 关键词: 全球卫星导航系统（GNSS） 地基伪卫星 跳时信号 信号捕获 跳时参数估计 |
| DOI：10.20079/j.issn.1001-893x.220720002 |
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| 基金项目: |
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| A Joint Acquisition Method Based on TH/DS-CDMA Signals of Pseudolites |
| ZHAO Guangyao,CHEN Xiao,YUAN Hong,LUO Ruidan,ZHAO Hongyu |
| ((1.Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China;2.School of Electronic, Electrical and Communication Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;3.Logistics Department of Space Systems Division,Beijing 100193,China)) |
| Abstract: |
| Ground-based pseudolites systems usually use time hopping/direct sequence-code division multiple access(TH/DS-CDMA) signals for pseudo-range measurement and positioning in order to overcome near-far effect,which leads to the design of the receiving terminal must increase the phase acquisition of system TH sequences,reducing the capture efficiency and introducing the capture complexity of the receiving terminal.To address above problems,the authors propose a joint acquisition algorithm based on the pseudolites TH signals.Using the time-domain orthogonal characteristics of the TH signal and time slot allocation characteristics,the acquisition results of multi-station single-pulse signals are mapped to enable time slot sequences,and the acquisition of TH parameters is completed by circular truncation correlation,which effectively reduces the TH parameter estimation time.The simulation test results show that the method can correctly complete the parameter estimation in the acquisition phase,and the acquisition time of four pseudo-satellites combined is reduced by 63.32% compared with the traditional method.It provides an effective method for fast acquiring of pseudo-satellite TH signals. |
| Key words: global navigation satellite system(GNSS) ground-based pseudolites TH/DS-CDMA signal signal acquisition TH parameter acquisition |
