GPS接收机抗射频干扰技术研究

Study of Anti Radio Frequency Interference Technique of GPS Receiver

GPS信号到达地面后十分微弱,极易受到射频干扰;为提高GPS接收机工作的可靠性,对射频干扰的来源和特点进行了研究;主要围绕载波噪声功率比分析了射频干扰对GPS接收机的影响,并据此解算出射频干扰的距离和功率组合;分析结果表明射频干扰会引起GPS接收机的码环、载波环精度下降,误码率升高;最后对目前存在的各种GPS抗射频干扰技术措施进行了介绍,指出通用GPS接收机主要采用自适应数字滤波器、自适应调零天线等时域、空域抗干扰技术。

As GPS signals arrive upon ground, usually they are very weak and susceptible to radio frequency interference. In order to enhance the working reliability of GPS receivers, a study of the sources and characteristics of the radio frequency interference was made. we analyse the impact of GPS receiver caused by the radio frequency interference mostly through the carrier noise power ratio, and according to this we can calculate the distance and power combination of the radio frequency interference. The results show that the accuracy of the code loop and carrier loop will decrease by radio frequency interference, and the interference also may causes high bit error rate. Finally we make an introduction of all kinds measures of current GPS anti radio frequency interference technique, pointting out that the current GPS receivers mainly adopt adaptive anti interference technique in the time domain, airspace like adaptive digital filter and adaptive hulling antenna.