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High-precision spaceborne time transfer system

A time transfer and high-precision technology, which is applied to radio-controlled timers, instruments using atomic clocks, instruments, etc., can solve problems such as poor time synchronization accuracy and inability to meet high target positioning requirements, so as to reduce drift and avoid sampling errors. Determinism, the effect of improving long-term stability

Inactive Publication Date: 2017-12-26
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The present invention provides a high-precision spaceborne timekeeping system to solve the problems that existing spaceborne surveying and mapping cameras and star sensors use positioning system second pulses and crystal oscillators to keep time. delivery system

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  • High-precision spaceborne time transfer system

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specific Embodiment approach 1

[0020] Specific implementation mode 1. Combination figure 1 Description of this embodiment, the high-precision spaceborne time transfer system includes a spaceborne platform, a star sensor unit, and an imaging unit. The spaceborne platform mainly includes a positioning system, a space controller, an atomic clock, a band-pass amplifier, a comparator, Phase-locked loop; star sensor unit mainly includes star controller and star sensor; imaging unit mainly includes camera controller and camera sensor. The time scale and second pulse generated by the positioning system are sent to the star affairs controller, and the star affairs controller domesticates the atomic clock with the second pulse sent in, and generates a new atomic clock second pulse and a low-amplitude sine clock of the tamed atomic clock;

[0021] The low-amplitude sinusoidal clock is amplified by a band-pass amplifier, then converted into a square wave by a comparator, and finally debounced and multiplied by a phase-...

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Abstract

The high-precision space-borne time transfer system relates to a space-borne time system, which solves the problem that existing space-borne surveying and mapping cameras and star sensors use positioning system second pulses and crystal oscillators to keep time, and have poor time synchronization accuracy, which leads to failure to meet high goals Positioning requirements and other issues. The invention organically combines long-term and short-term stability time reference sources, and constructs a high-precision satellite time transfer system based on a simplified white rabbit protocol with an accuracy better than 0.1 μs. The process of generating the multiplied clock is that after the atomic clock is domesticated by the second pulse output by the positioning system, the output sine clock is converted into a square wave and then de-jittered and multiplied; at the same time, the jump between the multiplied clock and the generated GPS second pulse is guaranteed The edge is determined. All the signals of this system are based on the multiplied clock to avoid the sampling uncertainty that occurred in the previous asynchronous system. At the same time, the round-trip reception of time information is used to measure the delay of the transmission path and correct the delay changes caused by factors such as temperature.

Description

technical field [0001] The invention relates to a satellite-borne time system, in particular to a high-precision satellite-borne time transmission system. Background technique [0002] Today’s spaceborne surveying and mapping cameras and star sensors use positioning system (GPS or Beidou) second pulses and crystal oscillators to keep time, and finally obtain the attitude parameters of the satellite at the corresponding shooting time according to the time stamp of the camera image, and the time synchronization accuracy is about 100μs. Can not meet the requirements of high target positioning accuracy. [0003] In the past, the time reference of the small satellite satellite service system used a separate external clock to provide the timing reference. The computer of the star service center sent the entire satellite time through the first-level CAN bus in the form of broadcast, and the relevant time system users received the entire satellite time through the CAN bus. After co...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G04F5/14G04R20/02
CPCG04F5/14G04R20/02
Inventor 余达刘金国郭疆王冶张贵祥王国良张艳鹏
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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