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通过对CAPS卫星(GEO卫星)资源和信号特征的分析,估算了接收机天线端信号功率,提出了CAPS粗码接收机C变L+GPS套片的实现方案和CAPS双频精码接收机实现方案;设计了高灵敏度CAPS微带接收天线、粗码/精码射频前端和导航基带处理器,搭建了单频CAPS粗码接收机和双频CAPS精码接收机;在接收机硬件设计框架下,给出了软件处理流程,并对信号搜索、码环和载波环路算法、高度辅助算法、频率辅助下的双频频差测速技术和单频测速信源技术、CAPS时间改正算法等相关关键算法和关键技术进行了研究.最后,对定位误差进行分析和讨论.测试结果表明,CAPS粗码接收机静态平面定位精度20.5～24.6m;高程1.2～12.8m;测速精度0.13～0.30m/s.粗码接收机动态平面定位精度24.4m;高程3.0m;测速精度0.24m/s,定时精度200ns.CAPS精码接收机定位精度(1σ)南北5.0m,东西0.8m.
Based on the analysis of the resource and signal characteristics of CAPS satellite (GEO satellite), the signal power at the antenna of the receiver is estimated. The realization scheme of CPS L + A high-sensitivity CAPS microstrip receiving antenna, a coarse code / fine code radio frequency front end and a navigation baseband processor are designed, and a single-frequency CAPS coarse code receiver and a dual-frequency CAPS code receiver are set up. Under the framework of receiver hardware design, , Gives the software processing flow, and analyzes the key algorithms such as signal search, code loop and carrier loop algorithm, height aided algorithm, frequency-assisted dual-frequency frequency difference velocity measurement technology and single frequency speed measurement source technology, CAPS time correction algorithm And key technologies.Finally, the positioning error is analyzed and discussed.The test results show that the static plane positioning accuracy of CAPS coarse code receiver is 20.5 ~ 24.6m, the height is 1.2 ~ 12.8m, and the precision is 0.13 ~ 0.30m / s. Coarse code receiver dynamic plane positioning accuracy of 24.4m; elevation 3.0m; speed accuracy of 0.24m / s, timing accuracy of 200ns.CAPS precision receiver positioning accuracy (1σ) 5.0m north-south, east-west 0.8m.