National Laboratory of Radar Signal Processing, Xidian University, Xi'an 710071, China.
Sensors (Basel). 2019 Sep 19;19(18):4040. doi: 10.3390/s19184040.
For improving the performance of multiple-target detection in a colocated multiple-input multiple-output (MIMO) radar system, a constant-modulus-waveform design method is presented in this paper. The proposed method consists of two steps: simultaneous multiple-transmit-beam design and constant-modulus-waveform design. In the first step, each transmit beam is controlled by an ideal orthogonal waveform and a weight vector. We optimized the weight vectors to maximize the detection probabilities of all targets or minimize the transmit power for the purpose of low intercept probability in the case of predefined worst detection probabilities. Various targets' radar cross-section (RCS) fluctuation models were also considered in two optimization problems. Then, the optimal weight vectors multiplied by ideal orthogonal waveforms were a set of transmitted waveforms. However, those transmitted waveforms were not constant-modulus waveforms. In the second step, the transmitted waveforms obtained in the first step were mapped to constant-modulus waveforms by cyclic algorithm. Numerical examples are provided to show that the proposed constant-waveform design method could effectively achieve the desired transmit-beam pattern, and that the transmit-beam pattern could be adaptively adjusted according to prior information.
为了提高共置多输入多输出（MIMO）雷达系统中多目标检测的性能，本文提出了一种恒模波形设计方法。该方法包括两步：同时多发射波束设计和恒模波形设计。在第一步中，每个发射波束由理想正交波形和权向量控制。我们优化了权向量，以最大化所有目标的检测概率或最小化发射功率，以在预定义的最坏检测概率情况下实现低截获概率。在两个优化问题中，还考虑了各种目标的雷达散射截面（RCS）波动模型。然后，最优权向量乘以理想正交波形得到一组发射波形。然而，这些发射波形并不是恒模波形。在第二步中，通过循环算法将第一步得到的发射波形映射到恒模波形上。数值示例表明，所提出的恒波设计方法可以有效地实现期望的发射波束图案，并且可以根据先验信息自适应地调整发射波束图案。
