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数字式干涉仪测向采用的是高精度数字鉴相技术,与传统的模拟鉴相技术相比可以大幅度提高鉴相精度,从而满足高精度干涉仪测向的要求。简要分析了数字干涉仪时域鉴相算法,详细阐述了实现高精度数字鉴相技术的关键环节,包括A/D采样,数字下变频设计以及基于坐标旋转数字计算(CORDIC)算法的反正切函数的FPGA实现及优化处理。在Virtex5的vc5sx95t芯片上测试结果表明,可以将数字鉴相误差控制在1°以内。
Digital interferometer direction finding uses high-precision digital phase-detection technology, compared with the traditional analog phase-detection technology can greatly improve the phase identification accuracy, so as to meet the requirements of high-precision interferometer direction finding. A brief analysis of the digital interferometer time-domain phase-discrimination algorithm is given, and the key steps to realize the high-precision digital phase-discrimination technology are described in detail. These include A / D sampling, digital down conversion design and arc tangent function based on CORDIC FPGA implementation and optimization. Virtex5 vc5sx95t chip test results show that the digital phase error can be controlled within 1 °.