基于GPS基准点的航空吊舱垂直下视目标定位方法研究

Abstract

Traditional UAS targeting technology uses space coordinate transformation theory to locate targets.It requires complicated calibration between INS benchmark,shock absorber base and optical turret coordinate.The accuracy of locating results is low due to the deviation of coordinate calibration and the latitude and longitude error of UAS.Errors brought by shock absorber can be eliminated thoroughly when INS and optical turret solid alliance installed in air pod.Using height value of airplane and laser distance measurement value,optical turret can work out the height of target in vertical down of view.It can also calculate GPS coordinate of target accurately using pixels relationship between target and GPS datum mark combined with the latitude and longitude of datum mark.Simulation test shows an accuracy result of ground target locating method based on GPS datum mark when air pod in vertical down of view status.Comparing with space coordinate transformation locating method,it saves complicated system calibration process,simplifies arithmetic formula,improves the locating accuracy and enhances the real-time feature of solution.