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A Method for Determining Time System Accuracy of Geostationary Orbit Remote Sensing Satellites

A technology for remote sensing satellites and geostationary orbits, applied in design optimization/simulation, calculation, computer-aided design, etc., can solve problems such as inability to accurately determine the time synchronization accuracy of geostationary orbit remote sensing satellites, achieve good use value, and realize simple Effect

Active Publication Date: 2020-11-20
BEIJING INST OF SPACECRAFT SYST ENG
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Problems solved by technology

[0006] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, to provide a method for determining the accuracy of geostationary orbit remote sensing satellite on-board time system, and to solve the problem that the prior art cannot accurately determine the on-board time synchronization accuracy of geostationary orbit remote sensing satellite , which can be used in the design, precision analysis, modeling and verification of the time synchronization system on geostationary remote sensing satellites

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  • A Method for Determining Time System Accuracy of Geostationary Orbit Remote Sensing Satellites
  • A Method for Determining Time System Accuracy of Geostationary Orbit Remote Sensing Satellites
  • A Method for Determining Time System Accuracy of Geostationary Orbit Remote Sensing Satellites

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Embodiment Construction

[0027] The on-board time synchronization process of geostationary remote sensing satellites is as follows: the star affairs computer uses the sine wave signal output by the satellite-borne high-precision clock source to generate a second pulse signal every second, and at the same time locks the whole second time corresponding to the second pulse, and transmits it through the 1553B bus The whole second time information is broadcast as the starting point for all time system users to work; the time service unit selects the second pulse signal as input, amplifies, splits and outputs each channel of second pulse signal to each time system user (camera, attitude measurement equipment), and then They use the received second pulse signal as the time scale signal, and use their own internal clocks to count, and finally calculate the absolute time corresponding to the data sampling time combined with the whole second time information. The specific process is attached figure 2 shown.

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Abstract

The invention discloses a method for determining on-satellite time synchronization precision of a remote sensing satellite on a stationary orbit. According to an on-satellite time synchronization principle of the remote sensing satellite on the stationary orbit, composition and influence factors of time service precision and time keeping precision are researched; a second pulse precision error anda second pulse signal transmission delay error are analyzed; time correction errors of links of a computer, an attitude measurement device (a star sensor or a gyroscope), a camera and the like are controlled; a set of method for determining the on-satellite time synchronization precision is established; the problem of incapability of accurately determining the on-satellite time synchronization precision in the prior art is solved; and the method can be used for design, precision analysis, modeling and verification work of an on-satellite time synchronization system of the remote sensing satellite on the stationary orbit.

Description

technical field [0001] The invention relates to a method for determining the precision of the on-board time system of a geostationary-orbit remote sensing satellite, which can be used for the design, precision analysis, modeling and verification of the on-board time synchronization system of the geostationary-orbit remote sensing satellite. Background technique [0002] In order to ensure the image quality of satellite imaging in geostationary orbit remote sensing satellites, cameras and attitude measurement equipment need to work under a unified time reference, so that the satellite imaging data and control measurement data have the same time base, and provide highly synchronized auxiliary data for ground image processing and image data to ensure the high precision of satellite image data. [0003] Because it operates in the geostationary orbit and is outside the downward coverage area of ​​GPS satellites, it is difficult and expensive to realize the method of hardware time...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F119/12
CPCG06F30/20G06F2119/12
Inventor 刘宁任晓航刘云鹤朱玛王丽俐汪精华鲁帆李乃海马健刘凤晶陈卓一孔祥皓史丽娟贺东雷刘鑫韦涌泉
Owner BEIJING INST OF SPACECRAFT SYST ENG
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