罗兰-C脉冲信号周期的联合识别方法

Joint cycle-identification method for Loran-C signal

针对目前罗兰-C接收机周期识别方法的不足,提出了一种载波跟踪信息与包络峰值检测相结合的罗兰-C脉冲信号周期的联合识别方法,并从基于峰值检测的周期识别原理、DLL峰值检测方法、联合判决方式等方面描述了该方法.仿真验证了DLL峰值检测的有效性,分析了联合识别方法的抗包周差性能和抗噪性能,最后通过将该方法运用于罗兰-C接收机设计,进一步验证了该方法对标准过零点的识别与跟踪性能.试验结果表明:联合识别方法具有良好的抗包周差性能,且在信噪比大于20 dB时,该方法能够准确无误地进行周期识别,满足现代罗兰-C数字化接收机设计指标要求.

To solve the disadvantages of the current techniques for cycle-identification in Loran-C receivers,a new method was proposed with the considerations of carrier tracking information and envelope peak detection.The method was described based on the principle of cycle-identification for peak detection,DLL peak detection method and joint decision pattern.The effectiveness of the DLL peak detection was verified by simulating,and the performance of anti-ECD and anti-noise of the method was analyzed.The identification and tracking performance of the method for standard zero-crossing point was verified by applying the method to the design of Loran-C receivers.The test result shows that the method has good performance of anti-ECD,and the method can identify the cycle accurately when the SIR is greater than20 dB.The proposed method can completely satisfy the modern Loran-C digital receiver design parameters.