Error analysis in data fusion of airborne radar and ADS-B

In data fusion of airborne radar and ADS-B, data accuracy of these systems will directly determine accuracy of fusion result. As to decrease errors and obtain precise estimation trajectory, it is critical to analyze errors´ characteristics. The paper discusses errors of airborne radar occurred in the fusion process, which include coordinate conversion errors and kinematic errors. The difference of statistic characteristic between former errors and converted errors, and the relation between kinematic errors and positioning errors are analyzed. In addition, to account for the shortage of Kalman fusion algorithm during the period that GNSS breaks down, this paper also discuss a fixed coefficient K of radar slant-range error, method to calculate K and correction on radar data. Simulation result indicates that fusion errors are reduced by considering airborne radar errors and coefficient K.