An Improved Hybrid Positioning Weighted Method Based on LS Weighted Estimation

We study the advantages of the DOA and TDOA methods in passive locating algorithm. DOA method is simple and less computation, but the precision is relatively poor; TDOA method has high precision, but the demand of time unification is very high for each observation station, the system is more complex, however the positioning error is high for low altitude target. So an improved hybrid positioning LS weighted method is presented. First we calculate the target localization by a master station and a secondary station measurement information in turn with LS estimation, then fuse several positioning results which are calculated with different secondary station measurement information. Through the introduction of appropriate weighting factor, we get the final radiation source location coordinates. The simulation result shows the effectiveness of the improved LS weighted method.