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Beam switching method and device

A technology of beam switching and beam, which is applied in the field of satellite communication, can solve the problems of increasing the residence time of communication terminals, and achieve the effect of increasing the residence time of beams and reducing the number of switching times

Active Publication Date: 2019-08-30
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the performance of the satellite communication system, it is of great research significance to increase the residence time of the communication terminal in a single beam and reduce the number of beam switching times. However, no better solution has been proposed so far.

Method used

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  • Beam switching method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 of the present invention provides a beam switching method, see figure 1 The flow chart of the beam switching method shown, the method includes the following steps:

[0034] The beam switching method designed in the embodiment of the present invention mainly considers the relative motion relationship between satellites and communication terminals, and can be applied to non-stationary orbit satellite systems using fixed multi-beam antennas, and fixed multi-beam geostationary systems that provide services for high-speed moving communication terminals satellite communication system. This strategy has no special requirements on the shape and arrangement of the beam of the satellite, and is applicable to various beam arrangements.

[0035] Step S102, when the communication terminal is located within the coverage of multiple beams, respectively determine a first relative positional relationship between the multiple beams and the satellite, and a second relative p...

Embodiment 2

[0072] Embodiment 2 of the present invention provides a beam switching method, see Figure 5 As shown in the schematic diagram of an example of earth station beam switching, the specific implementation steps of the method are as follows:

[0073] The constellation orbit parameters of the non-geostationary orbit satellite communication system are: a total of 8 satellites, the semi-major axis is 26561.78km, the orbital period is 1 / 2 sidereal day, the inclination is 53.13°, the eccentricity is 0, and the right ascension interval of the ascending node is 45°, and the mean anomaly angle difference is 90°; 642 earth stations are evenly distributed in the world by equal-area division method, the minimum working elevation angle of the earth station is 10°, and each earth station always chooses the one with the best elevation angle One beam access in the satellite, each satellite has 121 circular fixed spot beams.

[0074] Select the time of one orbital period as the simulation total ...

Embodiment 3

[0087] Embodiment 3 of the present invention provides a beam switching device, see Figure 6 The schematic block diagram of the structure of the beam switching device shown, the device includes the following modules:

[0088] The positional relationship module 61 is used to determine the first relative positional relationship between the multiple beams and the satellite and the second relative positional relationship between the communication terminal and the satellite when the communication terminal is located within the coverage of multiple beams; the relative positional relationship vector module 62, for calculating the relative positional relationship vectors between the communication terminal and the plurality of beams respectively according to the first relative positional relationship and the second relative positional relationship; the tangential velocity vector module 63, for determining the tangential position of the communication terminal relative to the satellite T...

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Abstract

The invention provides a beam switching method and a beam switching device, and relates to the technical field of satellite communications. The method comprises the following steps: when a communication terminal is located in the coverage area of a plurality of beams, respectively determining a first relative position relationship between the plurality of beams and the satellite, and a second relative position relationship between the communication terminal and the satellite; respectively calculating relative position relationship vectors between the communication terminal and the plurality ofbeams according to the first relative position relationship and the second relative position relationship; determining a tangential velocity vector of the communication terminal relative to the satellite; respectively calculating angles between the tangential velocity vector and the relative position relationship vectors, and selecting the beam corresponding to the smallest angle for access. Thebeam switching method and the beam switching device can select appropriate beams for access by considering the relative motion of the satellite and the communication terminal, thereby increasing the beam dwell time and reducing the number of times of switching.

Description

technical field [0001] The invention relates to the technical field of satellite communication, in particular to a beam switching method and device. Background technique [0002] For geostationary satellites, since they are always stationary relative to the ground, the coverage of fixed multi-beam antennas on the satellite is also fixed, similar to the ground cellular communication system. For mobile communication terminals, beam switching can be implemented with reference to ground technology. Applying a fixed multi-beam antenna to a non-geostationary orbit satellite communication system, since the non-geostationary orbit satellite is moving relative to the ground, and its attitude changes with time, the coverage wave position of its multi-beam antenna on the ground will also move and rotate accordingly . Especially for low-orbit satellites, due to their fast movement speed, ground communication terminals will frequently switch beams. For fixed multi-beam satellite syste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/185
Inventor 靳瑾李婷晏坚匡麟玲
Owner TSINGHUA UNIV
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