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Beam selection method for satellite terminal based on position information and motion trend
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A technology of position information and movement trend, applied in the field of satellite mobile communication, can solve problems such as risk, only considering beam signal quality, and ping-pong effect
Active Publication Date: 2021-09-14
军事科学院系统工程研究院网络信息研究所
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[0003] In Chinese patent CN111371486A, a method, system, equipment and storage medium for beam switching based on low-orbit satellites are proposed. By judging the beam signal quality, the beam with the strongest signal quality is selected for switching. This patent is mainly aimed at low-orbit satellite communications. The system is designed and only considers the beam signal quality, there is a risk of ping-pong effect
In the Chinese patent CN107852227B, a satellite communication position report and paging method based on distance threshold control is proposed, and whether to trigger a position report is determined by judging whether the difference between the current position of the user terminal and the expected position exceeds the distance threshold. The patent uses a fixed The distance threshold does not consider the influence of the direction of motion on the terminal's stay time in the beam
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Embodiment 1
[0029] Suppose the satellite terminal is covered by 3 beams at the same time, such as figure 2 As shown, the beam center points of the three beams are respectively recorded as beam center point 1, beam center point 2, and beam center point 3, L 1 , L 2 and L 3 are the distances between the satellite terminal and beam center point 1, beam center point 2 and beam center point 3 respectively, which can be calculated by the following formula:
[0030]
[0031] Among them, i=1,2,3, R is the radius of the earth, α u , are the longitude coordinates of satellite terminal and beam center point i respectively, β u , are the latitude coordinates of the satellite terminal and beam center point i, respectively.
[0032] Subsequently, for L 1 , L 2 and L 3 For comparison, suppose L 1 minimum, and L 2 and L 3 are greater than L 1 +ΔL, the satellite terminal selects beam 1 for camping, and then proceeds to the normal position update process.
Embodiment 2
[0034] Suppose the satellite terminal is covered by 3 beams at the same time, such as image 3 As shown, the distance L between the satellite terminal and beam center point 1, beam center point 2 and beam center point 3 1 , L 2 and L 3 Middle L 1 Minimal, L 2 meet L 2 ≤ L 1 +ΔL condition.
[0035] The satellite terminal obtains its own motion direction from the integrated angular accelerometer and accelerometer, that is, the angle θ between the velocity vector and the true north u, thus calculate the angle θ between the satellite terminal and the line connecting the beam center point 1 and beam center point 2 and the velocity vector of the satellite terminal 1 , θ 2 , calculated as follows:
[0036]
[0037] Among them, m=1,2.
[0038] Subsequently, the satellite terminal compares θ 1 with theta 2 the size of. Hypothesis θ 2 1 , it can be considered that the satellite terminal will move for a longer time on the beam (beam 2) to which the central point of the b...
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Abstract
The invention discloses a satellite terminal beam selection method based on position information and motion trend, which includes the following steps: firstly, the satellite terminal receives the longitude and latitude information of each beam center point from the broadcast message, combines its own position calculation with the beam center point Then, select the beam with the smallest distance to judge whether there are other beams with similar distances; if it exists, select the beam with the smallest angle with the direction of motion of the satellite terminal from the beams that meet the conditions as the selected beam; if not, then The beam with the smallest distance is designated as the selected beam; finally, the satellite terminal initiates the normal position update process. The method of the present invention can overcome the problem that the signal intensity from the center of the satellite beam to the edge is small, and it is difficult to select the beam according to the channel quality; it can alleviate the ping-pong effect, reduce the times of satellite terminal beam reselection and position update, reduce power consumption and prolong work time.
Description
technical field [0001] The invention relates to the technical field of satellite mobile communication, in particular to a satellite terminal beam selection method based on position information and motion trend. Background technique [0002] As the extension and supplement of terrestrial cellular mobile communication, satellite mobile communicationsystem is mostly used for communication and emergency communication in remote areas, which better solves the problem of limited coverage of terrestrial cellular mobile communication system in remote areas and sea areas. In a multi-beam satellite mobile communicationsystem, the gateway station will store the paging area information where each satellite terminal is located. When the satellite terminal is paged, the gateway station will page it in the paging area where the satellite terminal is located. Therefore, the satellite terminal needs to inform the gateway station of the paging area it is in in time when it is moving. For a ...
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