摘要
提出了和、差三通道雷达数字中频接收机的一种处理方法.该方法采用数字下变频将中频信号转换为正交视频信号,使用数字自动增益控制提高接收机的动态范围,通过相参积累和数字鉴频提取多普勒频率,根据和、差比幅提取方位和俯仰角误差,并以调节差通道本振初相的方式实现和、差通道幅相一致性校正.给出了用单片现场可编程门阵列实现数字中频接收机处理的具体方法.通过对接收机的实际测试表明,处理测量精度满足系统要求.
A method of processing is proposed for radar digital intermediate frequency （IF） receiver with sum-difference three channels. Digital down conversion（DDC） is used to transform the intermediate frequency signal to the orthogonal video frequency sig- nals. Digital automatic gain control（DAGC） is designed for enhancing dynamic range of IF digital receiver. Coherent accumulation and digital frequency discrimination are a- dopted to extract Doppler frequency. The angle errors of azimuth and pitch are meas- ured by comparing amplitude of sum-difference channels, and the correction of ampli- tude and phase imbalance of sum-difference channels is realized by changing initial pha- ses of local oscillator of difference channels. The realization of preprocessing of IF digit- al receiver based on single field-programmable gate array （FPGA） is introduced con- cretely. Actual testing on the digital receiver demonstrates that the measurement accu- racy of processing fits the need of system
出处
《电波科学学报》
EI
CSCD
北大核心
2014年第6期1212-1218,共7页
Chinese Journal of Radio Science
基金
部基金(9140A01040309BQ0101)
部预研项目(51301050202)
