GPS校频技术在船载频率源中的应用

Application of GPS Disciplined Clock in the Shipborne Frequency Source

采用GPS对船载频率源进行校准是一种新的尝试,其关键技术在于用GPS信号中的时间信息得到一个精准的时差信号。通过分析GPS校频技术的主要误差,硬件上采用单片机和可编程逻辑控制器等研制一种新型的校频电路,软件上采用卡尔曼滤波算法,克服了由GPS秒信号、铷频标秒信号的不稳定性以及测量噪声带来的影响,在较短的时间内获得较高的校频精度。技术已成功地应用于远望号测量船时频设备,为GPS校频技术拓展了新的应用领域。

It's a new try to use GPS to calibrate the shipborne Rb frequency source.The key of this technique is using the time information in the GPS signal to obtain an accurate time difference signal.Based on the error model of GPS disciplined clock,a new frequency calibration circuit is designed with SCM and CPLD.And a new Kalman filtering algorithm is developed to restrain the influence of instability of GPS 1pps signal,Rb frequency source and measurement noise.This design has been applied to the shipborne frequency device successfully,and the application opens a new field for the usage of GPS disciplined clock.