基于后验数据辅助的雷达系统补偿方法

在警戒、精密跟踪雷达与逆合成孔径成像雷达中，准确地估计目标距离、速度和角度对目标捕获与跟踪至关重要。在实际的雷达系统中，由于实现电路的非理想性，生成的信号往往难以精确符合理论设计，导致目标距离、速度估计结果与理论真值存在不同程度的偏差；同时，雷达接收通道不可避免地存在由系统各部分相互耦合产生的幅相不一致性，对目标角度估计带来潜在影响，且常规补偿过程复杂，往往难以获得一套最优的补偿系数。本文结合某实际雷达系统，建立了典型目标参数估计方法的数学模型，理论分析了影响雷达目标参数估计结果的各类因素，提出了一种基于后验数据辅助的系统补偿方案，并通过实测数据与外场试验验证了方法的有效性。

Posterior Data-Aid Based Scheme for Radar System Compensation

The accurate estimations of range, radial velocity, and angle are significant for target capture and tracking in surveillance radar, precision tracking radar, and inverse synthetic aperture radar. Owing to the non-ideal behaviors of circuits in the practical radar systems, the properties of the generated signals may deviate from the desired designs. Consequently, the biases between the experimental results and the ground truth occur in range and velocity estimations. On the other hand, the inconsistencies of the amplitude and the phase are unavoidable in receiving channels, which may considerably affect the angle estimation. In addition, the optimal coefficients are usually difficult to obtain owing to the complicated processing for compensation. In this paper, the mathematical models for target parameter estimation with typical methods are derived based on a practical radar system, and the corresponding influences are analyzed theoretically. Furthermore, a posterior data-aid based scheme for radar system compensation is proposed. The superiority of the proposed method is investigated and verified by the collected data and experiments.