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A novel system and method for computing the height accuracy of radio altimeter using differential global position system (dgps)
A novel system and method for computing the height accuracy of radio altimeter using differential global position system (dgps)
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机译：一种使用差分全球定位系统（dgps）计算无线电高度仪高度精度的新颖系统和方法
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ABSTRACT This invention presents a system employing a novel method to find the accuracy of height data, obtained from Radio Altimeter using DGPS. The system consists of a Data analysis system, Radio altimeter unit and DGPS system (DGPS airborne system, DGPS ground system). DGPS system consists of a ground station and airborne unit installed on the aircraft. The static ground based Reference Receiver positioned at a known location that has been previously surveyed. Both the airborne and the ground based receiver records that position data, which can be collected and stored for later processing. DGPS is based on the principle that receivers in the same vicinity will simultaneously experience common errors on a particular satellite ranging signal. In general, the airborne r eceivers us e measurements from the ground based to remove the common errors. The DGPS positioning equations are formulated so that the common errors are cancelled. With this method DGPS gives corrected altitude information along with latitude and longitude. Each time the aircraft moves slowly across the runway and runway altitude is monitored, this method is called runway profiling. After runway profiling, aircraft flies above runway i.e level flight and corresponding altitude of aircraft is monitored The difference of runway profiling altitude and level flight altitude gives the point to point, across runway terrain height. These heights are compared point to point with a radio altimeter computed altitude. The difference computed this way gives error in height computation by radio Altimeter.
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