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Synchronization method in satellite communication

A satellite communication and satellite technology, which is applied in the field of satellite communication, can solve the problems of large system delay, high complexity, and large resource consumption, and achieve the effect of simple structure, high relative accuracy, and strong real-time performance

Inactive Publication Date: 2013-04-10
BEIJING XINWEI TELECOM TECH
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  • Claims
  • Application Information

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Problems solved by technology

In addition, if the ground terminal receives the satellite broadcast ephemeris continuously, it will consume a lot of resources, and due to the complexity of the satellite communication link, some broadcast ephemeris may fail to be received, so it is very necessary for the terminal to extrapolate the necessary orbital parameters of
[0003] The application number is 200710176598.X, and the invention patent application titled "Global Positioning System positioning result smoothing and extrapolation method under signal loss" discloses a method for smoothing and extrapolating the output results of the GPS module. The method is passed The carrier phase method and the Kalman filter method calculate the receiver speed. According to the receiver speed, a smoothing window with an adaptive length is used for smoothing and a fitting polynomial with an adaptive order is used for extrapolation. Although the accuracy is good, the complexity is high , the system delay caused by calculation is relatively large
Since the satellite communication system has high requirements on cost and real-time performance, and the synchronization between the ground terminal and the satellite requires relatively low absolute accuracy of the satellite orbit parameters, the method disclosed in this patent application is not applicable to the satellite communication system. too applicable

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Embodiment Construction

[0014] The specific embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0015] The satellite communication synchronization method of this embodiment is as follows: figure 1 As shown, the specific process steps are as follows:

[0016] Step 101, the GPS module of the satellite outputs the ephemeris

[0017] The ephemeris mentioned in this embodiment (i.e. orbital parameters, including satellite position vector, velocity vector, etc.) is the ECI coordinate system (also called the inertial coordinate system, i.e. taking the center of the earth as the center of circle, the intersection line of yellow and red as the x axis, The north pole of the earth axis is the z-axis, and the value under the Cartesian coordinate system conforming to the right-hand system).

[0018] The ephemeris output by the satellite GPS module includes the current time t, the three-axis coordinates x, y, z of the satellite position vector at...

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Abstract

The invention provides a synchronization method in satellite communication. The synchronization method includes the following steps that a. a satellite conducts smooth calculation on an ephemeris output by a global positioning system (GPS) module to obtain a smoothened ephemeris; b. the satellite broadcasts and issues the smoothened ephemeris periodically, and a ground terminal starts ranging periodically; and c. the ground terminal conducts track extrapolation according to the received smoothened ephemeris and synchronizes with the satellite according to track extrapolation results and ranging results. The track extrapolation results are compensated through the ranging results so that relative precision is high. Compared with the prior art, the real-time performance is good, the structure is simple, and the cost is low.

Description

technical field [0001] The invention relates to the field of satellite communication, in particular to a synchronization method in satellite communication. Background technique [0002] In the satellite communication system, the satellite needs to broadcast the satellite's current ephemeris (that is, orbit parameters, including satellite position vector, velocity vector, etc.) output by its GPS module to the ground system to achieve system synchronization. However, due to the large instantaneous error in the output of the GPS module, the satellite needs to process the ephemeris output by the GPS (such as smoothing estimation, etc.) to obtain a more reliable ephemeris before broadcasting, so as to help the ground system to achieve more accurate Synchronize. In addition, if the ground terminal receives the satellite broadcast ephemeris continuously, it will consume a lot of resources, and due to the complexity of the satellite communication link, some broadcast ephemeris may ...

Claims

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Application Information

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IPC IPC(8): H04W56/00H04W84/06
Inventor 董源黄其华
Owner BEIJING XINWEI TELECOM TECH
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