Satellite visibility judgment method combined with terrain influence

Abstract

The invention discloses a satellite visibility judgment method combined with terrain influence. The method comprises the following steps of step 1, selecting an observation area, determining a stationpoint, calculating a satellite elevation angle by utilizing satellite coordinates and position coordinates of the station point, and judging the visibility of a satellite in the observation area; andstep 2, introducing topographic influence, calculating elevation angles of topographic sampling points, performing comparative analysis with elevation angles of satellites, and judging the visibilityof satellites again. The method is advantaged in that after terrain shielding of the experimental area is considered, the number of visible satellites and positioning accuracy of the satellites are obviously reduced compared with those when terrain shielding is not considered.

Description

technical field [0001] The invention relates to a method for judging satellite visibility combined with terrain effects. Background technique [0002] In GPS positioning, multiple satellites are required to cover the survey area to obtain better measurement results. However, in actual work, the number of visible satellites is often reduced due to the influence of terrain. For example, the diversity of mountainous terrain and the influence of urban buildings make satellite signals blocked by tall buildings, overpasses, and natural terrain, resulting in a significant reduction in the number of visible satellites, and even the number of satellites cannot meet the minimum positioning standards. However, most satellite visibility analyzes ignore the influence of these factors, resulting in a large difference between the satellite visibility evaluation results and the actual situation. Contents of the invention [0003] Purpose of the invention: In order to more accurately eval...

AI Technical Summary

Problems solved by technology

[0002] In GPS positioning, multiple satellites are required to cover the survey area to obtain better measurement results. However, in actual work, the number of visible satellites is often reduced due to the influence of terrain.

For example, the diversity of mountainous terrain and the influence of urban buildings make satellite signals blocked by tall buildings, overpasses, and natural terrain, resulting in a significant reduction in the number of visible satellites, and even the number of satellites cannot meet the minimum positioning standard

However, most satellite visibility analyzes ignore the influence of these factors, resulting in a large difference between the satellite visibility evaluation results and the actual situation.

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