恒包络OFDM雷达通信一体化研究

Research on Integrated Radar and Communication System Based on Constant Envelope OFDM

提出一种新的OFDM雷达通信一体化系统模型,通过DFT预编码和交织式子载波映射解决了OFDM信号峰均功率比较高的问题,实现了OFDM信号的包络恒定。同时,给出一体化系统信号处理方案,在通信接收端,通过传统的OFDM信号解调得到通信数据。在雷达接收端,通过二维联合搜索和时域相位测量进行目标速度的估计;结合相关处理和频域相位测量,实现雷达的高精度测距。仿真结果表明,在保证通信传输功能的前提下,一体化系统能够实现厘米级别的测距精度和米每秒级别的测速精度。

This paper proposes a new radar and communication integrated system model based OFDM.With DFT pre-coding and interleaved subcarrier mapping,the high peak-to-average power ratio problem is overcome,which achieves constant signal envelope.Simultaneously,the integrated signal processing scheme is given.At the communication receive end,the communication data is obtained by use of the traditional OFDM demodulation method.At the radar receive end,the target velocity is estimated by the two-dimensional joint search and time-domain phase measurement.Combining with correlation processing and frequency-domain phase measurement,high distance measurement accuracy is realized.The simulation results shows that the integrated system can achieve centimeter-level distance measurement accuracy and meter-per-second speed measurement accuracy under the premise of ensuring the communication transmission function.