便携式甚小口径地球站快速寻星技术研究

Study on GEO-satellite fast-finding technic of PVSAT

针对便携式甚小口径终端(PVSAT)应用中的快速寻星问题,在GEO通信卫星系统平台下,对AEP型天线座架的寻星原理进行了深入研究,分析了PVSAT站寻星的数学本质。基于低成本的MEMS三轴加速度计和三轴磁场计,搭建了替代调平机构的数字捷联平台,并推导了适用于AEP型天线座架快速寻星的轴角计算算法。测试及研究结果表明,基于数字捷联平台的寻星方法简化了PVSAT站寻星操作步骤,大大提高了其寻星速度,可以将寻星时间缩短为2 min以内;并且该方法省去了调平机构,有效改善了PVSAT站的便携性能。

Aiming at the fast-finding technic issue in portable very small aperture terminal（PVSAT） application, the GEO-satellite finding principle of the AEP type antenna pedestal was studied based on the GEO communication satellites system platform, and the mathematical essence of GEO-satellite finding was analyzed also. The digital strapdown platform based on low cost MEMS accelerometer and magnetometer was built, which can replace the traditional leveling mechanism, and the novel algorithm of AEP type antenna pedestal was derived. The results indicate that the novel method promote the speed of GEO-satellite finding by simplifying the operation procedures, and reduce the GEO- satellite finding time to 2 minutes in PVSAT applications. At the same time, the weight of the PVSAT is reduced by removing of leveling mechanism, and the portability of PVSAT is effectively improved.