GMSK+PN的遥测与测距互干扰抑制方法  

Interference cancellation of telemetry and ranging for GMSK+PN technique

作　　者：张金荣[1] 吴岭[1] ZHANG Jinrong;WU Ling(Beijing Institute of Tracking and Telecommunication Technology,Beijing 100094,China)

机构地区：[1]北京跟踪与通信技术研究所,北京100094

出　　处：《系统工程与电子技术》2018年第8期1708-1712,共5页Systems Engineering and Electronics

摘　　要：针对基于最小高斯频移键控+伪码(pseudo-noise code,PN)测距的遥外测体制存在遥测数据和测距信号相互干扰问题,提出一种干扰抑制方法。接收机在遥测解调前,通过负反馈环路将本地重新生成的测距信号与接收信号进行相关处理,去除接收信号中的测距信号,以提高遥测信号信噪比;遥测数据解调后进行信道译码,降低误码率,提高重建的测距信号质量。经仿真得到了遥测误码率、PN捕获时间和测距精度。结果表明,采用干扰抑制方法后,有效抑制了测距信号对遥测的干扰,减小了遥测误码对测距性能的影响,提高了遥测误码率性能、PN捕获性能和测距精度。Aiming at the mutual interference problem which exists in a system based on Gaussian minimumshift keying （GMSK）＋ pseudonoise code（PN）technique, a interference cancellation technique is proposed. Firstly, the ranging signal is removed from the received signal before telemetry demodulation by subtracting the regenerated ranging signal, which improves the telemetry signal to noise ratio. Secondly, channel decoding is implemented to correct errors output by the telemetry demodulator, which ameliorates the reconstructed ranging signal. The proposed algorithm is simulated to obtain bit error rate of telemetry data, ranging precision and PN code capture performance. The simulation results show that the interference of the ranging signal on telemetry data is effectively restrained and the influence of telemetry data errors on the reconstructed ranging signal is suppressed. The telemetry data, ranging precision and PN code capture performance are improved.

关 键 词：遥测 测距 最小高斯频移键控 伪码 干扰抑制 

分 类 号：V556.1[航空宇航科学与技术—人机与环境工程]