Device and method for measuring sensitivity of tracking and targeting system to beacon spot displacement

Abstract

The invention discloses a device and a method of measuring beacon light spot displacement sensitivity by a tracking and pointing system. The device adopts a wavelet transform-based data processing method, a long-distance light source displacement with a fixed frequency and regularly-changed amplitude is generated through simulation by a laser, a piezoelectric actuator, a piezoelectric ceramic quick mirror, a collimator and the like, the amplitude and the frequency of the light source displacement are set in advance, a to-be-detected system detects the light source, a working computer carries out wavelet transform and other data processing on the detected information, and thus, the beacon light spot displacement sensitivity by the to-be-detected system can be obtained. Interference on the measurement device by jitter of the measurement platform can be effectively suppressed, and the device and the method of the invention are simple, convenient and easy.

Description

Technical field: [0001] The invention relates to high-precision system sensitivity measurement, in particular to a measurement of the displacement sensitivity of a tracking and targeting system to a beacon light spot, which can be used for system testing and system evaluation of a tracking and targeting system of space laser communication. Background technique: [0002] The core technology of space laser communication is capture, tracking, and aiming technology, while suppressing the irregular jitter of the satellite platform and realizing tracking and aiming technology at the micro-arc level are the difficulties. After the development of a set of satellite laser communication terminal is completed, it is very important to test and evaluate the performance of the tracking system. The irregular jitter of the satellite platform has the characteristics of low frequency, high amplitude, and high frequency, low amplitude. Therefore, the displacement sensitivity of the tracking sy...

AI Technical Summary

Problems solved by technology

The irregular jitter of the satellite platform has the characteristics of low frequency, high amplitude, and high frequency, low amplitude. Therefore, the displacement sensitivity of the tracking system to the beacon spot is an important parameter for evaluating the satellite platform’s irregular jitter suppression ability. However, the following problems make it difficult to Accurately measure the displacement sensitivity of the tracking and targeting system to the beacon spot:

[0003] 1. In order to achieve tracking and aiming accuracy at the micro-ardian level, the tracking and aiming system needs to have a sensitivity to the displacement of the light spot to reach the sub-micro-ardian level or even higher, and it is difficult to generate the sub-micro-radian-level spot displacement under laboratory conditions ;

[0004] 2. In order to measure the displacement sensitivity of the tracking and aiming system to the spot, the traditional method is to accurately set the spot displacement of different amplitudes under laboratory conditions, and then use the system under test to detect the spot displacement respectively. Such a process operation is relatively cumbersome;

[0005] 3. The test platform in the laboratory itself has irregular vibrations on the order of tens or even tens of urads. For the sensitivity of the tracking and aiming system to the sub-micro-radius level of spot displacement, this irregular vibration will introduce a huge amount to the measurement. error

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