电讯技术2017，Vol.57Issue(10)：1205-1212,8.DOI:10.3969/j.issn.1001-893x.2017.10.017
卫星导航中XFAST捕获的降计算量去模糊处理算法
An Ambiguity Resolving Algorithm for XFAST Acquisition with Less Computational Amount in Satellite Navigation
摘要
Abstract
In satellite navigation system,extended replica folding acquisition search technique ( XFAST) is used to capture long PN-code directly,but the aligned code phase obtained after coarse acquisition has o-verlapped ambiguity. In order to reduce the computational amount of resolving ambiguity and to speed up acquisition process, a new method is proposed. Firstly, local code chips are arranged according to the coarsely captured aligned code phase,segmented and shifted circularly within separate segments,and then all new local code sub-segments are folded together. Further,the received code and the new local folded code are performing circular correlation operations through FFT-IFFT,and the precise code sub-segment of the aligned code phase can be determined. Thus the ambiguity of coarse acquisition can be solved. Theo-retical analysis and simulation results demonstrate that, under the condition that the number of sub-seg-ments and the length of the sub-segment satisfy certain relations,the proposed algorithm can reduce the computational amount of resolving ambiguity and operating time to speed up acquisition process greatly with the detection performance meeting the system requirements.关键词
卫星导航系统/长码直捕/快速捕获/去模糊/计算量/折叠相关Key words
satellite navigation system/direct acquisition of long code/rapid acquisition/ambiguity resolu-tion/computational amount/folded correlation分类
信息技术与安全科学引用本文复制引用
赵盼盼,姚彦鑫..卫星导航中XFAST捕获的降计算量去模糊处理算法[J].电讯技术,2017,57(10):1205-1212,8.基金项目
国家自然科学基金资助项目(61302073) （61302073）
北京市自然科学基金资助项目(4172012,Z160002) （4172012,Z160002）
北京市教委面上项目(KM201711232010) （KM201711232010）
