基于空间-频率调制的雷达通信一体化波形性能分析

Performance Analysis of Space-Frequency Modulated Waveform for Integrated Radar and Communication System

为实现相互分立的电子设备多功能综合一体化,雷达通信一体化波形设计成为当下一体化领域的研究热点。空间-频率调制(SFM, space-frequency modulation)是一种将一维通信数据映射到空间和频率两维的调制技术,将该技术应用于雷达通信一体化波形设计中,可以得到同时实现探测和通信功能的SFM共用波形。空间-频率调制通过阵列天线设计带来探测性能的提升的同时,充分利用空域资源进行通信调制,有效提高了通信数据率。本文首先介绍了基于空间-频率调制的雷达通信一体化共用波形的设计过程,利用空间-频率调制生成一体化发射信号并结合阵列模型实现发射波束形成;然后,针对一体化信号的解调过程,提出一种基于排序的子阵阵元数估计优化算法。理论分析得到子阵规模越大对应误码率越容易受噪声影响,通过修正最大的子阵估计数值可以保证总估计阵元数与实际一致,有效降低误码率;最后,针对目前基于空间-频率调制的雷达通信一体化波形性能分析不够全面的问题,对一体化信号的通信性能和探测性能边界展开分析,基于探测和通信性能折中点为雷达适用不同场景提供依据。仿真结果表明,本文提出的误码修正方案能有效降低误码率,且通过调整一体化波形的关键参数,可以实现不同场景下雷达和通信性能之间的最佳折中。

In order to realize the multifunctional integration of electronic devices that develop separately,the integration of radar communication has become a hot spot in the field of integration research.Space-frequency modulation(SFM)is a modulation technology that can map one-dimensional communication data to two dimensions:space and frequency.When space-frequency modulation technology is applied to radar communication integrated waveform design,it can obtain spacefrequency modulation common waveform,which can realize radar detection and communication transmission functions at the same time,in addition,it can not only obtain the radar detection performance improvement brought by the scale gain of array antennas,but also obtain the improvement of the communication data rate after the use of airspace information for communication data modulation.In this paper,the design process of radar communication integrated common waveform based on space-frequency modulation was first introduced,which introduced that the integrated transmission signal is gen⁃erated by space-frequency modulation and the transmission beamforming is realized by combining the array model.And then,aiming at the demodulation process of integrated signal,a sequence-based subarray element estimation optimization algorithm was proposed.Theoretical analysis showed that the larger the scale of the subarray is,the more susceptible to the influence of noise can it be.On the basis of this conclusion,by modifying the maximum subarray estimation value,the total estimated number of elements can be guaranteed to be consistent with the reality,thereby effectively reducing the bit error rate.Finally,aiming at the problem that the current radar communication integrated waveform performance analysis based on space-frequency modulation is not comprehensive enough,the communication performance and detection perfor⁃mance boundary of radar communication integrated common waveform based on space-frequency modulation was analyzed,so as to provide a basis for this radar communication integrated waveform to apply to different scenarios based on the detec⁃tion and communication performance trade-offs.The simulation results showed that the bit error correction scheme pro⁃posed in this paper can effectively reduce the bit error rate,and by adjusting the key parameters of the integrated wave⁃form,the best compromise between radar and communication performance in different scenarios can be achieved.