基于OFDM随机步进频的雷达通信一体化信号模型

为了解决雷达通信一体化系统中的雷达信号与通信信号较难分离的问题,在正交频分复用(OFDM)雷达的基础上,提出了一种基于OFDM脉间随机步进频的雷达通信一体化信号模型,通过频率捷变将数据信息加载到雷达信号上,利用随机的步进频率传输数据,从而使一体化信号能同时实现雷达探测和数据通信功能,避免了信号分离。同时设计了雷达通信一体化方案,在雷达接收端,运用相关法实现一维距离成像;在通信接收端,通过带通滤波器组检测频率点解调数据。仿真实验结果表明,一体化信号能实现分米级的距离高分辨和速率为Mbit/s级的数据通信,能够满足大批量数据传输的要求。

A signal model for integration of radar and communication based on random stepped-frequency OFDM radar pulses

To solve the problem of signal separation in the system of integration of radar and communication, a signal model based on random stepped-frequency Orthogonal Frequency Division Multiplexing(OFDM) radar pulses is proposed. By the frequency agility, the communication data is modulated on the radar pulses and then transmitted through random stepped-frequency pulses. Thus, the target range image can be acquired from the correlation of the echo signal and the reference signal, while the communication data is demodulated by means of frequency detection through bandpass filter group without signal separation. Finally, simulation results show that the designed signal realizes decimeter range resolution imaging and high-rate data transmitting in Mbit per second, which can satisfy the requirements of transmitting the mass data.