| 摘要: |
| 针对应答脉冲信号的同步干扰（即混扰）造成二次雷达询问机解码错误的问题，提出了基于多通道阵列处理的混扰信号分选算法。首先建立了询问机天线使用多通道阵列的混扰信号模型，在此基础之上给出了应答机个数及其到达角估计算法，并提出了基于最大似然估计的应答信号分选算法。仿真结果表明，该算法能够从混扰信号中同时准确分离多个应答信号，性能明显优于FastICA算法。当信噪比高于10 dB时，所提算法的分离指数比FastICA算法至少低10 dB。 |
| 关键词: 二次雷达 混扰 多通道阵列处理 应答信号解码 |
| DOI： |
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| 基金项目:国家自然科学基金资助项目(61201379)；安徽省自然科学基金资助项目(1208085QF103) |
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| Separation of garbled secondary surveillance radar signal based on multichannel array processing |
| TANG Bo,CHENG Shui-ying,ZHANG Hao |
| () |
| Abstract: |
| To overcome the problem of decoding errors of secondary surveillance radar(SSR) due to the presence of garble,an algorithm for separating the garbled replies based on array processing is proposed.Firstly,a signal model for the garbled replies is established in which the transponder of SSR utilizes the uniform linear array. Then methods for the detection of the number of transponders and the estimation of their direction of arrival(DOA) are presented. Afterwards,a recovery algorithm of the garbled replies from the transponder based on maximum likelihood estimation is proposed. Numerical simulations show that the proposed method can accurately and simultaneously separate multiple replies,and it significantly outperforms the fast independent component analysis(FastICA) algorithm.The seperation performance of the proposed method is lower at least 10 dB than that of FastICA algorithm when SNR＞10 dB. |
| Key words: secondary surveillance radar garble array processing transponder signal decoding |
《电讯技术》编辑部 