基于数字接收机技术的RDSS通道零值测试方法  

Delay Measurement of RDSS Channel Based on Digital Receiver

作　　者：崔小准[1] 毕少筠 钟兆丰[1] 刘天雄[1] 王健[1] 

机构地区：[1]中国空间技术研究院总体部,北京100094

出　　处：《测试技术学报》2014年第1期1-6,共6页Journal of Test and Measurement Technology

基　　金：国家重大科技专项资助项目(DHZX01A02004)

摘　　要：用于变频器群时延的测试方法不适合传输扩频信号的无线电测定业务(RDSS)通道零值测试;用示波器直接观察RDSS通道传输信号波形来实现零值测试的方法精度很差;本文提出方法采用数字接收机技术,用真实的RDSS信号作为测试信号,对RDSS通道输入和输出进行同步过采样,然后对采样后的输入和输出信号分别进行基于扩频相关的数字接收机处理,获取RDSS输入和输出数据中伪随机码起始点,最后根据采样周期、连接电缆、衰减器和功分器的时延,得到RDSS业务通道零值.分析和仿真结果表明:测试不确定度优于0.2ns,其准确性和测试精度也得到实验系统验证.The group delay measurement method for frequency-converting devices is not suitable for radio de- termination satellite service （RDSS） channel in which spread spectrum signal is transmitted. The accuracy of observing the transmitting signal waveform in RDSS channel by using an oscilloscope is very poor. Here we propose a method based on digital receiver technology. With the real RDSS signal as a test signal, the input and output of RDSS channel are oversampled in synchronization. The start point of the PRN （pseudo random noise） code for the sampled signal data were determined by using correlation technique of digital receiver. Ac- cording to the sampling period and the delay of the cables, attenuator and divider, the absolute delay of the RDSS channel can be obtained. Analysis and simulation results show that the calibration precision is high and the calibration uncertainty is better than 0.2 ns. The accuracy of the proposed method has been verified with the experimental system.

关 键 词：导航卫星 无线电测定业务 时延 零值测试 数字接收机 

分 类 号：V448.251[航空宇航科学与技术—飞行器设计]