Measuring apparatus and measuring method of spot centroid extraction accuracy

Abstract

The present invention discloses a measuring apparatus and method of spot centroid extraction accuracy. The apparatus uses a displacement high-frequency modulation method. A fast steering mirror, a collimating device, and the like actuated by a laser device and a piezoelectric ceramics actuator generate remote high-frequency small-amplitude light source displacement in a simulation manner, an amplitude and a frequency of the light source displacement are set in advance, a spot centroid extraction system detects the light source displacement, a working computer processes data obtained through detection, and to-be-measured spot centroid extraction accuracy may be obtained. According to the measuring apparatus and method of spot centroid extraction accuracy, interference of measuring platform jitter on spot centroid extraction accuracy measurement can be effectively restrained, and the measuring apparatus and method is simple and convenient.

Description

Technical field: [0001] The invention relates to high-precision measurement of system accuracy, in particular to a measurement of spot centroid extraction accuracy, which can be used for tracking and aiming accuracy testing in space laser communication capture, tracking and aiming systems and integration and assembly of corresponding systems. Background technique: [0002] The core technology of satellite laser communication is acquisition, tracking and aiming technology, and the tracking and aiming technology at the micro-arc level is the difficulty. After a set of satellite laser communication terminal is successfully developed, its performance should be tested and evaluated before the official launch. Among them, the centroid extraction accuracy of the beacon spot of the terminal is an important indicator. However, the following problems make it difficult to measure the accuracy of its beacon spot centroid extraction: [0003] 1. The centroid extraction accuracy of the b...

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Problems solved by technology

However, the following problems make it difficult to measure the accuracy of its beacon spot centroid extraction:

[0003] 1. The centroid extraction accuracy of the beacon spot of the general satellite terminal machine should reach the sub-micro radian level. According to the principle of the test, the accuracy of the test device for the centroid extraction accuracy should reach within 1urad, which puts forward very high requirements for the test device

[0004] 2. The test platform in the laboratory itself has irregular vibrations in the order of tens or even tens of urads. For the measurement of the centroid extraction accuracy of the light spot at the sub-micro-radiance level, this irregular vibration will introduce a great impact on the measurement system. error

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