Page 24 - 中国仿真学会通讯2020第1期
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longest. The LoS from left bottom point to top right point are defined as Line1 and Line2 respectively.
and the LoS from right bottom point to top left
Fig.4.Two terrain tiles are pieced together starting with N04E01 and setting two lines of sight.
In experiments, the heights of viewpoints 1 and Table 2. The heights of occlusion points are
and targets are initialized to 500m, 1000m, lower than which of viewpoints and targets
1500m, 2000m, 2500m and 3000m respectively, because of the influence of the earth curvature.
and the computational results are shown in Table
Table 1. The computational results of Line1 for different heights of viewpoints and targets.
Line1 Heights( m)
from N04E01 to N05E03
500 1000 1500 2000 2500 3000
Occlusion point longitude( °) 1.20 1.47 - -
Occlusion point latitude( °) 4.10 4.23 1.53 1.81 - -
Occlusion point altitude( m) 67.45 138.63 4.27 4.40 - -
Computational number of GCS tiles 559.18 840.72 2 2
Intervisible 1 1 Yes Yes
No No 1 1
No No
Table 2. The computational results of Line2 for different heights of viewpoints and targets.
Line2 Heights( m)
from N04E03 to N05E01
500 1000 1500 2000 2500 3000
Occlusion point longitude( °) 3.00 2.91 - -
Occlusion point latitude( °) 4.00 4.05 2.70 2.24 - -
Occlusion point altitude( m) 499.84 784.94 4.15 4.38 - -
Computational number of GCS tiles 894.75 865.52 2 2
Intervisible 1 1 Yes Yes
No No 1 1
No No 21