基于GPS校准的皮卫星高精度时间系统方案  

The High-Precisiontime System Design of Pico-Satellite Based on GPS Receiver

作　　者：苏星[1] 王慧泉[1] 金仲和[1] 

机构地区：[1]浙江大学微小卫星研究中心,杭州310027

出　　处：《传感技术学报》2016年第8期1200-1204,共5页Chinese Journal of Sensors and Actuators

基　　金：国家杰出青年基金项目(61525403)

摘　　要：许多实际应用任务对皮卫星星上时间系统有较高的精度要求,传统采用实时时钟芯片(RTC)的时间系统方案难以满足需求,基于GPS的皮卫星星上时间系统应运而生。受能源限制,皮卫星携带的GPS接收机一般采用间歇性开机方式工作。本文设计实现了一种基于GPS校准的星上时间系统方案,提出了分级校正算法,并对算法中的参数进行了优化,实验表明,每天GPS接收机仅需开机1 024 s,即可保证优于1 ms/d的星上时间精度。整个方案实现简单,且已应用于浙江大学研制的ZDPS-2皮卫星,满足了任务载荷5 ms时间精度的要求。High-precision system time is usually required in many missions of pico-satellite. Traditional solution of timing system based on real-time clock（RTC）chip in pico-satellite cannot meet thisrequirement,therefore GPS re？ceiver（GPSR）is applied in the design of timing system. However,GPSR in pico-satellite cannot work for long time because of the energy limitaiton. Then a design of a timing system based on GPSR which only need to be powered on for a short time has been presented in this paper. An algorithm to calibrate system time for long-term is provided. Experiment shows that the time accuracy is better than 1 ms/d when GPSR works for 1 024 seconds per day. Thisde？sign has been applied in ZDPS-2 satellite,and qualified the mission requirements of 5 ms/d.

关 键 词：皮纳卫星 时间系统 GPS接收机 秒脉冲 FPGA 

分 类 号：V423.43[航空宇航科学与技术—飞行器设计]