基于时频融合的分布式目标的恒虚警率检测

CFAR Detection of Distributed Targets Based on Time-Frequency Fusion

从双门限检测理论出发,将时域、频域双门限检测法结合起来,推导出一种基于时频融合的分布式目标的恒虚警率检测方法。以同一目标的两个不同角域的距离像检测为例,通过仿真验证了时频融合检测法具有较好的检测性能,并将其与时域、频域双门限检测法和广义似然比检测法进行了性能比较。结果表明时频融合检测法优于广义似然比检测法;而与时域、频域双门限检测法相比,时频融合检测法对不同角域距离像具有良好的稳健性。

The dual-threshold detections in time and frequency are integrated based on the principle of dual-threshold detection. A method of CFAR detection of distributed targets based on time-frequency fusion is derived. A good performance of time-frequency fusion is proved by detecting two range profiles of the same target for different angle. And then its performance is compared with the dual-threshold detection of time and frequency and the GLRT detector. Simulation results show that the method of time-frequency fusion detection outperforms the GLRT detector; and compared with. the dual-thresholddetection of time and frequency, the method possesses a good robustness for range profiles of different angle.