Abstract
DGPS는 GPS위성배열의 기하학적인 특성에 따라 수평면 정확도에 비해 고도 정확도가 좋지 않다. DGPS고도를 보정하기위해 두 개의 기압고도계를 사용하였고 각각 이동국과 기준국에 설치하여 차분된 고도를 얻어냈다. 이 차분된 고도는 DGPS 고도측정치와 칼만필터로 결합하여 향상된 고도를 추정한다. 이와 같은 차분된 고도는 기존의 상대고도에 기반을 두고 있지만 압력 고도가 아닌 절대고도를 주는 것에 차이가 있다. 또한 기저선의 변화에 따라 차분된 고도가 얼마나 정확성을 갖고 있는지 실제 실험을 통해 확인한다. DGPS provides less altitude accuracy than horizontal accuracy according to geometric characteristics of GPS satellite arrangement. To assist DGPS altitude measurements, two barometric altitude sensors were used and set up at the mobile and the reference station respectively to get the differential altitude. This differential altitude is coupled with the DGPS altitude measurement by a Kalman filter so that the improved altitude is estimated. The differential altitude is based on the relative altitude measurement but results in providing the absolute altitude. The precision of this differential altitude is verified by experiments in accordance with a baseline length.
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More From: Journal of the Korean Society for Aeronautical & Space Sciences
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