Long Base Real Time Positioning of Airborne Sensors

摘要

The determination of instantaneous positions with high accuracy is of great importance for several applications in the earth science domain. One example is airborne gravimetry and altimetry. In many of these applications, especially over sea areas, long baselines are involved, and all the problems which arise from this fact. This is still a matter which causes several difficulties in most of the differential GPS techniques developed and implemented. The demand for real time positioning introduces also some more constraints which must be taken into account from the start of the algorithm development to the end of its implementation.rnThis paper presents a technique that, taking advantage of the availability of other instrumentation, produces real time positions for a GPS antenna which can easily be more than 100Km away from the reference station. It is based on L1 and L2 carrier phase processing with ambiguity determination. The additional instruments are an Inertial Measurement Unit (IMU), additional antennas mounted on the body of the rover, and several reference stations spread over a large area.