一种扩频高度表的伪码同步方案

A Scheme for PN Code Synchronization of the Spread Spectrum Altimeter

由于机载扩频高度表应用于高动态、低信噪比的环境下,文中对数字化中频直扩接收机中的同步技术进行了研究,提出了适用于扩频高度表的伪码快速捕获及精密跟踪的方案,并阐述了方案的实现原理。该方案比传统方法大大地缩短了捕获时间和硬件复杂度。给出了基于Matlab和Simulink的数字化仿真模型,以及在跟踪部分实现的效果分析。

In view of the airborne spread spectrum altimeter is applied to the high-dynamic and low SNR environment, the synchronization of digitalized direct sequence spread system receiver was analyzed and the scheme of fast acquisition and precise tracking of PN code which applied to spread spectrum altimeter was proposed, and the realization principle of the scheme was explained. Compared with the traditional acquisition methods,the scheme can dramatically reduce the acquisition time and simplify the hardware complexity. The digital simulation model based on Matlab and Simulink was given.