Time synchronization method and synchronization system of lmccd camera

Abstract

The time synchronization method and synchronization system of LMCCD cameras relate to a time synchronization system, which solves the problem of positioning errors in the push-broom imaging of existing stereoscopic surveying and mapping cameras, which leads to low positioning accuracy of surveying and mapping images, and cannot meet the requirements of high time precision, etc. Problem, the present invention integrates the time scale generation function module and the sensor timing generation module into the same chip, reducing the time delay of obtaining time scale and the uncertain time of delay time; the time scale generation function module adopts the pure hardware working mode of the counter trigger mode , to avoid additional time errors caused by software; reduce timing deviation caused by crystal frequency drift through self-calibration working mode; calculate line period of line array CCD and area array CCD according to track height, pixel size, main distance and rendezvous angle frame period. In order to take into account the camera of area array CCD at the time of orientation and keep the synchronization of area array and line array CCD, the frame period adjustment strategy of area array CCD is stipulated.

Description

technical field [0001] The invention relates to a time synchronization system, in particular to a time synchronization system of an LMCCD camera. Background technique [0002] With the development of photogrammetry technology, transmission-type optical stereoscopic mapping satellites can overcome the short orbital life of returnable satellites due to the limitation of the number of films they carry due to their long-term in-orbit operation and the ability to quickly obtain three-dimensional geographic information. The lack of timeliness of information and the inability to directly form digital images have gradually become the mainstream of photogrammetry satellite development. Transmission-type three-line array optical imaging and photogrammetry belong to dynamic photography. The satellite takes pictures of the same target multiple times from different angles of view, and the three-dimensional spatial position information of the target can be determined through post-processi...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a time synchronization method and a synchronization system for LMCCD cameras to solve the problems of positioning errors in push-broom imaging of existing stereoscopic mapping cameras, which lead to low positioning accuracy of surveying and mapping images, and cannot meet the requirements of high time accuracy.

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