摘要: From Distance Measurement Equipment (DME) data recorded during Microwave LandingSystem (MLS) flight trials, the positions of the aircraft was determined by postprocessing and compared with the MLS and Instrument Landing System (IL... 展开 From Distance Measurement Equipment (DME) data recorded during Microwave LandingSystem (MLS) flight trials, the positions of the aircraft was determined by postprocessing and compared with the MLS and Instrument Landing System (ILS) derived positions. An empirical determination of the expected accuracy of a rho-rho DME solution is reported. The difference between the DME position and the MLS (or ILS) position is presented. The predicted DME position error deviates slightly from the data analysis results. The main characteristics of the model was reflected by the results at an intersection angle between the distances of about 30 degrees. The position error is about four times larger than at an intersection angle of 90 degrees. When using a rho-rho DME position solution to navigate in the vicinity of an airfield at low altitudes, reliability problems with the used DME distances can be experienced due to line of sight problems. Depending on the intersection angle between the distances, the position determination error will be in the order of 500 to 1000 m. Compared with an MLS derived position, the DME position error is at least an order of magnitude larger. 收起