基于GPS的目标飞行时间异地高精度测量技术  

Technology of High-precision Measurement of Target's Flight-time in Long-distance Based on GPS

作　　者：黄战华[1,2] 孟南[1,2] 赵杰[1,2] 蔡怀宇[1,2] 

机构地区：[1]天津大学精密仪器与光电子工程学院 [2]光电信息技术科学教育部重点实验室,天津300072

出　　处：《光电工程》2010年第8期1-4,11,共5页Opto-Electronic Engineering

基　　金：国家863计划资助项目

摘　　要：针对远程目标异地作用的特性以及异地时间测量对时间统一标准的严格要求,提出了一种基于GPS的高精度异地目标光信号时间测量系统。该系统将GPS授时与本地温补晶振时钟结合起来,利用GPS授时秒脉冲1pps进行时间同步,由本地时钟结合GPS的标准时间测量出飞行目标启动和停止的精确时间及时间间隔;同时设计了高精度的授时方案,对GPS秒脉冲进行监控和补偿,有效提高了系统的可靠性。实验表明,该系统测量在400s内所产生的累积测量误差小于300μs,等效精度达到7.5×10-7。For the characters of long-distance flight target and the stringent requirements of time synchronization standard in time-measurement of different locations,we put forward a high-precision time-measurement system based on GPS.The system combines GPS time service with local crystal oscillator clock,which uses GPS second pulse to make time synchronization and local crystal oscillator clock to measure precise time of the start and stop of flight target.Meanwhile,it gives a way to realize high-precision time synchronization from monitoring and compensating GPS second pulse.Experiments show that the system is able to control the deviation less than 300 μs within 400 s＇ measurement,and the equivalent precision can reach 7.5×10^-7.

关 键 词：GPS授时 本地温补晶振时钟 时间同步 异地目标飞行时间测量 

分 类 号：TP722.4[自动化与计算机技术—检测技术与自动化装置]