| 摘要: |
| QAM-OFDM(Quadrature Amplitude Modulation-Orthogonal Frequency Division Multiplexing)雷达通信共享信号因携带随机通信信息，其脉压旁瓣的随机性较大，类似噪声的影响。针对该问题，采用基于Keystone变换的长时间相参积累算法抑制其旁瓣。在共享信号模型的基础上，分析了其脉压旁瓣受随机通信信息的影响以及采用长时间相参积累抑制其旁瓣的可行性，然后采用Keystone变换校正其长时间相参积累产生的距离单元走动，并进行多普勒模糊补偿处理。理论分析和仿真结果表明，该方法使得回波能量积累集中，能有效实现共享信号脉压旁瓣的抑制。 |
| 关键词: 正交频分复用（OFDM） 雷达通信共享信号 Keystone变换 相参积累 |
| DOI： |
|
| 基金项目:国家自然科学基金资助项目（61271454） |
|
| Long-time coherent integration of QAM-OFDM radar communication integrated sharing signal |
| YANG Yongjun,MEI Jinjie,HU Dengpeng,LEI Yunlong |
| (Early Warning Intelligence Department,Air Force Early Warning Academy,Wuhan 430019,China) |
| Abstract: |
| Because quadrature amplitude modulation(QAM)-orthogonal frequency division multiplexing(OFDM) radar communication integrated sharing signal carries random communication information,its pulse compression sidelobe is more random,similar to the effect of noise.To solve this problem,a long-time coherent integration algorithm based on Keystone transform is used to suppress the sidelobe.Based on the sharing signal model,the influence of random communication information on the pulse compression sidelobe is analyzed,and the feasibility of suppressing the sidelobe by long-time coherent accumulation is analyzed.Then the Keystone transform is used to correct the moving of the distance unit generated by the long-time coherent accumulation,and the Doppler fuzzy compensation processing is carried out.The theoretical analysis and simulation results show that this method can effectively suppress the pulse compression sidelobe of sharing signal by concentrating the echo energy accumulation. |
| Key words: orthogonal frequency division multiplexing(OFDM) radar communication integrated sharing signal Keystone transform coherent integration |
