基于CAD的天测罗经差天体方位计算

Calculation of celestial body azimuth with compass error by celestial observation based on CAD

为提高天测罗经差天体计算方位的精度,提出采用计算机辅助设计(Computer-A idedDesign,CAD)的方法进行天测罗经差的天体方位计算.该方法综合考虑纬度误差、经度误差和赤纬误差所引起的计算方位误差,通过人机对话等方式,显示天体计算方位误差的变化曲线,选择观测天体罗方位的最佳时机,实现天体方位计算的精度要求.该方法提高罗经差的可靠性,可供船舶驾驶员借鉴.

In order to improve the precision of the celestial body＇s azimuth-calculation with the compass error by celestial observation, a method is proposed based on computer-aided design （CAD）. According to this method, the errors of the azimuth-calculation caused by latitude errors, longitude errors and declination errors are synthesized. By the help of the man-machine conversation, the variation curve of errors in the celestial body＇ s azimuth-calculation is showed on the computer, the best observing time about the celestial body＇ s azimuth can be selected, and the requirements of the precision of the celestial body＇ s azimuth-calculation can be satisfied. It improves the reliability of the compass error, and can be used by ship officers for reference.