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Doppler Shift Characterization of Chinese Area Positioning System

机译：中国地区定位系统的多普勒换档特征

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The Chinese Area Positioning System (CAPS) is a Navigation System based on commercial communication satellites invented by scientists from Chinese Academy of Sciences. Its constellation consists of geostationary Earth orbit (GEO) and slightly inclined geostationary orbit (SIGSO) satellites, which are different from the other navigation satellite system, such as GPS and GLONASS. To achieve centimeter-level ranging accuracy, a triplefrequency signals method for CAPS is proposed to eliminate the ionosphere errors by the chosen phase-code combinations. The optimized three frequencies from Cband are 3826.02MHz, 3979.47MHz and 4143.15MHz. Considering the system specification of CAPS constellation and frequencies, its Doppler characterization is studied. The Doppler shift of two GEO satellites (87.5°E and 110.5°E) and two SIGSO satellites (51.5°E and 142°E) with three optimal frequencies is simulated. Since the Doppler shift is produced by the relative motion of the satellite with respect to the user, the satellite and user position, the direction and magnitude of satellite and user velocity all influence the value of Doppler shift. In the simulation, the satellite velocity vector is computed using CAPS satellites ephemeris information and six CAPS stations are applied as user location. The simulation results show that the Doppler shift of the GEO satellites is no more than ±25 Hz and that of the SIGSO satellites no more than ±600 Hz for the stationary user. When the user velocity is less than 100 m/s, the GEO satellite Doppler shift is limited within ±1.3 kHz and the SIGSO satellite Doppler is within ±1.9 kHz. The Doppler shift of CAPS is mainly caused by the user velocity.
机译：中国地区定位系统（CAPS）是基于中国科学院科学家发明的商业通信卫星的导航系统。它的星座由地球静止地球轨道（地理）和略微倾斜的地球静止轨道（Sigso）卫星组成，其与其他导航卫星系统不同，例如GPS和Glonass。为了实现厘米级测距精度，提出了一种用于帽的三重信号方法，通过所选的阶段代码组合消除电离层误差。来自C频带的优化三个频率为3826.02MHz，3979.47MHz和4143.15MHz。考虑到CAPS星座和频率的系统规范，研究了其多普勒表征。模拟两个地理卫星（87.5°E和110.5°E）和两个Sigso卫星（51.5°E和142°E）的多普勒偏移，具有三种最佳频率。由于多普勒移位由卫星相对于用户的相对运动，卫星和用户位置，卫星和用户位置的方向和幅度都影响多普勒偏移的值。在模拟中，使用帽卫星星历信息来计算卫星速度向量，并将六个盖子站应用于用户位置。仿真结果表明，Geo卫星的多普勒偏移不超过±25Hz，硅胶卫星不超过±600Hz的静止用户。当用户速度小于100米/秒时，Geo卫星多普勒频率在±1.3 kHz内受限，Sigso卫星多普勒在±1.9 kHz内。帽的多普勒偏移主要由用户速度引起。

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