Multiarray digital coherent combing technology for real-time target speckle correction in heterodyne detection

Abstract

The practical application of active laser heterodyne detection is significantly constrained by the decoherence effects induced by target speckles. Therefore, this study proposes a multiarray digital coherent combing method based on the sequential algorithm (SA) for real-time target speckle correction in heterodyne detection. Experiments show that the SA can compensate for phase differences between the array heterodyne signals without any prior knowledge, thereby achieving real-time and accurate compensation for target speckles. Thus, the proposed method contributes to the development of active laser heterodyne detection applications, such as synthetic aperture lidar, long-distance coherent lidar, and laser vibrometry.