摘要
为提高GPS接收机的灵敏度,采用模糊控制算法自适应调节接收环路的信号带宽,调和带内噪声控制与频率误差之间的矛盾。在GPS接收机设计中,通过降低环路带宽,抑制进入带内的噪声能量,提高环路信噪比,但在高动态环境下,为增加系统对频率误差的容忍度,就需适当提高环路带宽。采用模糊控制对接收环路的噪声带宽进行自适应调节,达到了提高接收机灵敏度的目的。仿真结果表明,该接收机系统性能比传统接收机在平方损耗及误码率等方面有不同程度的提高,使其更适用于高动态环境。
In order to improve the sensitive of GPS receiver,the bandwidth of received signal was adjusted adaptively through fuzzy control algorithm to make trade-off between noise power and frequency error.Generally,the bandwidth of received signal should be decreased to suppress the noise power and improved the SNR of tracking loop.But when GPS receiver was fast-moving,the tolerance of frequency error should be enhanced by reducing the bandwidth of received signal.Fuzzy control algorithm was used to accommodate this conflict.The simulation results show that： the bit error ratio and the square lost of this receiver have better performance than the traditional receiver,so this receiver was more suitable for fast moving environment.
出处
《现代电子技术》
2012年第9期48-51,56,共5页
Modern Electronics Technique
