A Precise Timing Method of Integral Time Based on Second Pulse

Abstract

The present invention is an accurate and punctual method for integral time based on second pulses. The satellite integrated electronic manager generates integral time data and its transmission time scale and sends them to the management controller through the CAN bus; The difference calculation is performed on the time scale, and the time scale of the sending time scale is incremented by 10ms to obtain the integration time of the difference; after the management controller compares the updated UTC time with the time scale of the integration time, the transmission time scale is accurately compared and synchronized, and then integrates the synchronized difference The time is sent; while the local clock in the management controller is performing us timing, the hardware second pulse is used as the trigger of the local clock us timing, and the current hardware second pulse count is compared with the adjacent adjacent hardware second pulse count difference, according to The difference adjusts the timing of the local clock us in the management controller, compensates the clock drift cycle error, and realizes accurate timing.

Description

technical field [0001] The invention relates to a precise time-keeping method for integral time based on second pulses, which belongs to the technical field of aerospace optical remote sensing information processing. Background technique [0002] With the increasing image quality of optical remote sensing satellites, the accuracy of image registration and image spectrum registration requires higher and higher precision of imaging integration time and time synchronization. At present, the time synchronization of commonly used video circuits mainly includes hardware second pulse compensation high-precision timing and bus time synchronization timing. This paper proposes a high-precision timing and compensation scheme for on-orbit imaging acquisition to meet the requirements of high-precision time synchronization. High-precision time synchronization for orbital target imaging. [0003] At present, most infrared radiation characteristic measurement systems adopt integration time...

AI Technical Summary

Problems solved by technology

[0004] At present, the commonly used video circuit integration time adjustment is mainly the adjustment of the whole star online command. After the camera receives the command to change the integration time, it will first store the command, and analyze and package the current image sequence to the drive circuit. According to the different sending time of the command, The degree of out-of-synchronization of the integration time at different times is not the same, and the time scale of the current image frame does not match the integration time, which is equivalent to the introduction of additional image motion during TDICCD push-broom imaging

After the signal processor downloads the image integration time data with time scale to the ground and other integration time data with time scale after geometric correction, there are certain differences in the integration time time scale data at the same time, and the link error and delay in the transmission process It greatly affects the timeliness of integration time

Images