| Citation: | ZHANG Kunwei, WANG Kedong. Judgement criterion for terrain false matching based on joint probability of multiple reference points[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(7): 1562-1568. doi: 10.13700/j.bh.1001-5965.2017.0499(in Chinese)
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Since the terrain contour matching (TERCOM) algorithm is easy to mismatch due to measurement error and terrain self-similarity, an on-line false matching judgement criterion based on the joint probability of multiple reference points in a correlation plane was proposed by taking mean square difference (MSD) as an example. Firstly, the MSD correlation plane was calculated by the correlation of the measured elevation data with the reference elevation data. Then, the MSD probability distribution density function of the candidate matching points was derived by analyzing the statistical distribution of elevation measurement error. Finally, the multi-point joint probabilities were calculated for all the candidate points in the correlation plane so that they are compared with a threshold to judge the matching of the point with the minimum MSD value false or not. The simulation results show that 97% false matching points can be detected and 90% correct matching points can be preserved when the threshold is set to 0.9, implying that false matching can be avoided to a great extent.
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