Method for implementing split-second precision synchronism using spread-spectrum answering machine

A spread spectrum transponder and time synchronization technology, applied in the field of satellite measurement and control, can solve the problem of not finding reports and other problems, and achieve the effects of saving on-board resources, high precision, and ensuring accuracy

Active Publication Date: 2009-07-29
AEROSPACE DONGFANGHONG SATELLITE
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  • Method for implementing split-second precision synchronism using spread-spectrum answering machine
  • Method for implementing split-second precision synchronism using spread-spectrum answering machine
  • Method for implementing split-second precision synchronism using spread-spectrum answering machine

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[0027] The equipment participating in this method includes an on-board time reference device, a spread spectrum transponder, and ground measurement and control testing equipment. The on-board time Ts; the spread spectrum transponder adopts S-band spread spectrum transponder. The ground measurement and control test equipment is S-band spread spectrum measurement and control test ground equipment. The manufacturers include Beijing Telemetry Technology Research Institute, Shijiazhuang Communication Measurement and Control Technology Research Institute (CLP 54) and Southwest Electronic Technology Research Institute (CLP 10). Before introducing the method of the present invention, first briefly introduce the spread spectrum transponder in the above-mentioned equipment.

[0028] The S-band spread spectrum transponder used in the spread spectrum transponder in this embodiment is mainly composed of a receiving channel, a transmitting channel, a digital baseband, a lower computer, etc....

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Abstract

The invention relates to a method for realizing high-precision time synchronization by utilizing a spread spectrum transponder. The method comprises the following steps: (1) test equipment for ground test and control transmits an up measuring frame to the spread spectrum transponder; (2) the spread spectrum transponder carries out sampling to the up measuring frame, extracts up pseudo-range information and inserts the up pseudo-range information to a down measuring frame and then transmits the down measuring frame to the test equipment for ground test and control; (3) the test equipment for ground test and control obtains the time Ts on the satellite from the down measuring frame, records the ground time Tg corresponding to a falling edge or a rising edge of a certain position of frame synchronous code of the down measuring frame, simultaneously measures transmission time delay DeltaTR of the up measuring frame and the down measuring frame and calculates the transmission time delay tauR of one-way distance; (4) Tg-Ts-tauR is calculated to obtain the time difference DeltaT of the satellite and the ground; and (5) the test equipment for ground test and control transmits an up modulation signal containing DeltaT to the spread spectrum transponder; and time reference equipment on the satellite carries out relevant adjustment according to the DeltaT sent by the spread spectrum transponder. The invention realizes time synchronization of the satellite and the ground of nano second level.

Description

technical field [0001] The invention relates to a satellite time synchronization system, in particular to a nanosecond-level high-precision time synchronization system for a small satellite constellation, which belongs to the field of satellite measurement and control. Background technique [0002] With the development of small satellite technology, a constellation system composed of multiple small satellites replaces large satellites for space activities, thereby enhancing the flexibility, accuracy and safety of satellite activities has become a development trend. Some of the functions of the constellation system, such as target positioning, require nanosecond-level high-precision time synchronization between stars. [0003] At present, in the field of domestic satellite measurement and control, there is only a time synchronization method with millisecond-level precision for a single satellite to ground through satellite-ground telemetry links, and there is no nanosecond-le...

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Application Information

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IPC IPC(8): H04B7/185G01S5/02G01S5/14H04B1/69
Inventor 朱雪萍刘锐梅贾涛陶成华汪勃
Owner AEROSPACE DONGFANGHONG SATELLITE
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