Amplitude comparison monopulse systems encounter the target resolution problem when multiple targets occupy the same range-azimuth cell. To solve this problem, a new angle estimation approach is proposed. The traditional range-cell-based signal processing is improved by modeling the signal in the frequency domain. Thus, the range straddling loss and the range migration problem can be avoided. The closely spaced targets in the same range-azimuth cell can be well resolved by the jointly maximum likelihood estimation of the range and velocity of the targets. Then, the angle estimates are extracted by using the monopulse ratio technique with the estimated parameters of the resolved targets in the two channels. Furthermore, the RELAX algorithm is utilized to reduce the computational burden of the proposed approach. The performance of the proposed estimator is evaluated using Monte Carlo simulation.

中文翻译：

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使用多个观测值对多个目标进行单脉冲-雷达角度估计

当多个目标占据同一个距离-方位角单元时，幅度比较单脉冲系统会遇到目标分辨率问题。为了解决这个问题，提出了一种新的角度估计方法。通过在频域中对信号建模，改进了传统的基于范围单元的信号处理。因此，可以避免范围跨度损失和范围迁移问题。通过对目标范围和速度进行联合最大似然估计，可以很好地解决同一距离方位角单元中的近距离目标。然后，使用单脉冲比率技术将角度估计值与两个通道中已解析目标的估计参数一起提取。此外，RELAX算法被用来减少所提出方法的计算负担。