A system and method for extracting vibration characteristic parameters based on distributed lidar

Abstract

The invention provides a system for extracting vibration characteristic parameters based on distributed laser radars. The system is a single-transmitter multi-receiver type multi-station distributed detection system, and comprises a main transmitting laser radar and a plurality of receiving laser radars. The receiving laser radars are coplanar with the main transmitting laser radar, and the main transmitting laser radar is located in the center of the plane.

Description

technical field [0001] The invention relates to the technical field of distributed optical system detection, in particular to a system and method for extracting vibration characteristic parameters based on distributed laser radar. Background technique [0002] Vibration is a common movement form of various moving objects in the world. Whether it is the fragments that traverse across the vast universe, or the rockets that go straight to the sky in space exploration and the equipment they carry, as well as people and insects in nature, there is a certain degree of motion characteristic of vibration. Vibration is closely related to the quality, material type and structure distribution of moving objects. Through the measurement and extraction of the vibration parameters of the vibration target, on the one hand, based on the vibration frequency and other characteristics, it can provide a basis for the identification of the vibration target; support, thereby reducing implementat...

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Problems solved by technology

From the perspective of the detection system, the existing extraction method is based on the electromagnetic radar detection system, and there is only one electromagnetic radar for detection, and it cannot meet the spatial detection resolution requirements for centimeter-level moving targets; In terms of method, the traditional method of extracting vibration characteristic parameters is based on the transmission and reception data of an electromagnetic radar for detection. It can only obtain the vibration frequency in the projection direction of the line of sight, and cannot extract the real vibration frequency of the moving target in three-dimensional space. Fine characteristic parameters such as vibration azimuth, vibration amplitude, initial phase, direction angle and pitch angle; From the perspective of vibration detection implementation, although lidar has great advantages in improving detection accuracy, the existing vibration characteristic parameter extraction In the process of the method, the complexity of the distributed system layout is increased by the coherent processing method of the optical transmission of the local oscillator.

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