一种扩频高度表的载波跟踪方案

Scheme for Carrier Tracking of the Spread Spectrum Altimeter

为了解决机载扩频高度表在高动态及低信噪比环境下易受干扰的缺点,并提高高度表工作性能,详细分析了频偏对伪码相关峰值的影响和载波相位误差对解调性能的影响,在此基础上提出了一种适用于扩频高度表的载波跟踪方案,并阐述了方案的实现原理,同时对方案进行了跟踪性能的分析;通过Matlab对方案进行了数字化仿真,给出了实现的部分效果分析;理论分析和仿真结果表明,该方案的运用能在动态环境下快速及精确地实现扩频高度表接收机的载波跟踪。

For resolving the Characteristics of the airborne spread spectrum altimeter is interfered easily in the high-dynamic and low SNR environment, increasing the working function, The article analysis in detail the influence of the frequency departure in the PC peak value and the influence of the carrier lagging error in the demodulate, presents the scheme of carrier tracking which applied to spread spectrum altimeter, and explains the realization principle of the scheme, meanwhile analysis the tracking characteristics; The article shows the digital simulation model based on Matlab, and some part of implementation. The analysis and simulation results indicate that this method could realize carrier tracking quickly and precisely.