Abstract: The differences among the gun-target distances and directions calculated using the space geodetic coordinate system and the Gauss plane rectangular coordinate system are quantitatively analyzed, and the influences of BJS54 and CGCS2000 on distance calculation accuracy are also analyzed. The results show that, due to projection distortion, the gun-target distance error calculated using the Gauss plane rectangular coordinate system is up to 1‰, and the gun-target direction error is larger at a farther gun-target distance. When BJS54 and CGCS2000 are used to calculate the gun-target distance, the difference between the calculated results is less than the actual distance of 0.05‰, which can be ignored.

Key words: ordnance science and technology, artillery combat, coordinate system, projection distortion, gun-target distance, gun-target direction