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Method for autonomous access to low-orbit broadcast satellite without ephemeris

A technology of broadcasting satellites and ephemeris, applied in radio transmission systems, electrical components, transmission systems, etc., can solve the problem that terminal equipment cannot access low-orbit broadcasting satellites, etc., and achieve the effect of increasing application efficiency

Active Publication Date: 2019-04-16
10TH RES INST OF CETC
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Problems solved by technology

[0004] The purpose of the present invention is to address the deficiencies in the above-mentioned prior art, and provide a method for terminal receivers to autonomously access low-orbit broadcast satellites without ephemeris conditions, which can effectively solve the problem that terminal equipment cannot access low-orbit broadcast satellites without ephemeris conditions. The Problem with Orbiting Broadcast Satellites

Method used

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  • Method for autonomous access to low-orbit broadcast satellite without ephemeris
  • Method for autonomous access to low-orbit broadcast satellite without ephemeris

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Embodiment Construction

[0012] refer to figure 1 . According to the present invention, according to the following steps:

[0013] In the case of no ephemeris or ephemeris failure, the terminal equipment accesses the low-orbit broadcast satellite autonomously. The autonomous access is divided into three stages: the target search stage, the target fine tracking stage and the orbit data receiving stage.

[0014] In the target search phase, the terminal device performs target search in a full range traversal manner within the search range, sets the beam direction of the terminal according to the search results, uses the signal estimation algorithm to perform signal estimation on the received beam, and judges whether there is a signal, if there is no signal Then switch to the next beam pointing. When the satellite signal is searched, it will enter the target fine tracking stage, otherwise the search will be repeated until the external condition control terminates the search.

[0015] refer to figure 2...

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Abstract

The invention provides a method for autonomous access to a low-orbit broadcast satellite without ephemeris, aiming to solve a problem that a terminal device cannot access to a low-orbit broadcast satellite without ephemeris. The method is as follows: amid no ephemeris or ephemeris failure, the terminal device autonomously accesses to the low-orbit broadcast satellite, wherein autonomous accessingfalls into three stages: target search stage, target precise tracking stage and orbit data receiving stage, in the target search stage, a target is searched in a full-range traversing manner in a search spatial domain, after a satellite signal is found, target precise tracking stage is started, the terminal is guaranteed to receive the satellite signal constantly in a time period through orbit observation and extrapolation methods, after precise tracking for a fixed time, the orbit data receiving stage is started, a terminal receiver solves orbit data delivered by a satellite in a received data frame, and complete update of local ephemeris and access to subsequent circle by using new orbit data.

Description

technical field [0001] The invention relates to the field of low-orbit broadcast satellite access, and aims at a method for terminal equipment to independently access low-orbit broadcast satellites under the condition of no ephemeris. Background technique [0002] The low-orbit satellite communication system in the satellite communication system has the advantages of global coverage, low transmission delay, low power consumption, and strong invulnerability. The orbit height of low-orbit satellites is about 700-1500km. Due to the existence of multi-satellite coverage in the low-orbit satellite communication system, it is an important issue to be solved in the access strategy according to which criteria to select access satellites. The server in the satellite system generates precise ephemeris after calculating and processing the information received from the satellite navigation system (GPS system, Galileo system, Beidou system). The user terminal will download the precise ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/185
CPCH04B7/18523H04B7/18526
Inventor 曾富华高卫斌熊沛
Owner 10TH RES INST OF CETC
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