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Positioning method, device and system for for mobile terminal of low-orbit communication satellite

A technology of communication satellites and mobile terminals, applied in the field of satellite positioning, to achieve the effect of improving positioning accuracy, precise positioning and avoiding errors

Pending Publication Date: 2021-04-02
XIAN SPACE STAR TECH IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the current low-orbit communication satellites cannot achieve accurate position positioning of ground terminals

Method used

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  • Positioning method, device and system for for mobile terminal of low-orbit communication satellite
  • Positioning method, device and system for for mobile terminal of low-orbit communication satellite
  • Positioning method, device and system for for mobile terminal of low-orbit communication satellite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] See figure 1 , figure 1 It is a schematic diagram of a positioning method for a low-orbit communication satellite mobile terminal provided by an embodiment of the present invention, which is used for a ground central station, including:

[0041] S1. Send an access control command to the target terminal, so that the target terminal transmits an access request to the low-orbit communication satellite at full power at the first moment t'; wherein, the target terminal can be various types of mobile terminals with positioning functions, Such as mobile phones, locators, handheld stations, etc. For the convenience of access, the target terminals mostly use L and S bands. In addition, ground mobile terminals using phased array antennas can track multiple satellites at the same time, and mostly use C, ku, and ka bands.

[0042] S2. Receive the local transmission delay reported by the satellite, wherein the local transmission delay is based on the second time t" when the satel...

Embodiment 2

[0053] See figure 2 , figure 2 It is another module block diagram of a positioning device for a low-orbit communication satellite mobile terminal provided by an embodiment of the present invention, which is used for a ground central station, including:

[0054] An access request control unit, configured to send an access control command to the target terminal, so that the target terminal transmits an access request to the low-orbit communication satellite at full power at the first moment t';

[0055] The transmission delay receiving unit is configured to receive the local transmission delay reported by the satellite, wherein the local transmission delay is according to the second time t" when the satellite receives and detects the access request signal transmitted by the target terminal, the target terminal The first moment t' of the full power transmission access request and the satellite processing delay t 0 get;

[0056] The transmission distance calculation unit is u...

Embodiment 3

[0065] See image 3 , image 3 It is a schematic diagram of a positioning system for low-orbit communication satellite mobile terminals provided by an embodiment of the present invention, including a ground center station and at least three satellites; when the ground center station locates a target terminal, it executes the above-mentioned A positioning method for mobile terminals of low-orbit communication satellites.

[0066] When the system performs a complete positioning method, see Figure 4 , including the following process:

[0067] Step 1, the ground central station NCC instructs the ground target terminal to send an access request at time t';

[0068] Step 2, when the ground target terminal arrives at time t', transmit an access request;

[0069] Step 3, the satellite completes the detection of the access request signal at time t";

[0070] Step 4. The satellite calculates the local transmission delay t i ;

[0071] Step 5. The satellite reports to the ground ...

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Abstract

The invention discloses a positioning method for a mobile terminal of a low-orbit communication satellite, which is used for a ground central station and comprises the steps of S1, sending an access control command to a target terminal so as to enable the target terminal to transmit an access request to the low-orbit communication satellite in a full-power manner at a first moment t'; S2, receiving local transmission time delay reported by the satellite, wherein the local transmission time delay is obtained according to a second moment t'' when the satellite receives and detects an access request signal transmitted by the target terminal, the first moment t' when the target terminal transmits the access request in a full-power mode and satellite processing time delay t0; S3, when the localtransmission time delay reported by at least three satellites is received, calculating the transmission distance L between the target terminal and each satellite according to the local transmission time delay ti of each satellite; and S4, calculating the position coordinate MT of the target terminal according to the transmission distance L and the coordinate Ms of the satellite at the second moment. Accurate positioning of the position of the ground terminal can be realized by means of the ground central station.

Description

technical field [0001] The invention belongs to the field of satellite positioning, and in particular relates to a positioning method, device and system for a low-orbit communication satellite mobile terminal. Background technique [0002] In recent years, the technology of low-orbit communication satellites has developed rapidly, and many companies have proposed construction plans for the construction of low-orbit communication satellite constellations. Most of these low-orbit satellite constellation plans are to provide communication access services to terminals on the ground in the overhead arc segment by constructing hundreds of satellites operating on multiple orbital planes in the low-earth orbit of the earth. [0003] Unlike geostationary satellites, low-orbit satellites have low orbits and high speeds, so it is difficult to provide signal coverage / access services for the same area for a long time. Therefore, the low-orbit communication satellite constellation genera...

Claims

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Application Information

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IPC IPC(8): G01S19/42G01S19/03G01S19/24G01S5/02G01S19/25
CPCG01S19/42G01S19/03G01S19/24G01S19/256G01S5/02
Inventor 陈昱良郭伟李京娥党金瑞张骞丹
Owner XIAN SPACE STAR TECH IND GRP