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从应答着陆系统的基本测角原理入手,设计了系统角度测量的数字电路实现方案。分析了数字下变频和高精度数字鉴相等关键技术。以FPGA为平台,采用CORDIC算法设计数字鉴相器,并在QuartusⅡ环境下进行方案的计算机仿真分析。结果表明,该方案是可行、有效的,能满足系统的精度要求,且易于实现。
Starting from the principle of answering the basic angle measurement of landing system, a digital circuit implementation scheme of system angle measurement was designed. The key technologies of digital down-conversion and high-precision digital detection are analyzed. Taking FPGA as a platform, the digital phase detector is designed by CORDIC algorithm and the computer simulation of the scheme is carried out in Quartus Ⅱ environment. The results show that this scheme is feasible and effective, can meet the precision requirements of the system, and is easy to implement.