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在实时扩频接收机中对码的捕获速度以及可靠性要求非常严格,文中通过对目前直扩系统中常用的捕获方法进行比较,在此基础之上介绍了一种非相干匹配滤波算法,利用现场可编程门阵列FPGA的可编程性,详细地将此算法模块化,并结合算法的优化以节省FPGA资源和提高捕获速率,最后在QuartusⅡ实现仿真验证。结果表明,该算法捕获效果良好,实现简单,满足对直扩系统的实时性及可靠性要求,随着FPGA的发展,本算法对于直扩系统具有一定的实用价值。
In the real-time spread spectrum receiver, the acquisition speed and reliability of the code are very strict. In this paper, we compare the commonly used acquisition methods in DSSS system. Based on this, we introduce a non-coherent matching filter algorithm, The FPGA programmability of field programmable gate array, in detail the algorithm modular, combined with the algorithm optimization to save FPGA resources and improve capture rate, and finally in the Quartus Ⅱ simulation and verification. The results show that this algorithm has a good capture effect, simple implementation and meets the real-time and reliability requirements of DSSS. With the development of FPGA, this algorithm has certain practical value for DSSS.