Terrain aided navigation using PDAF

Terrain aided navigation (TAN) is the concept of using terrain height variations below the aircraft to render a position estimate that is used to bound the error in the INS. A new TAN approach using PDAF (probabilistic data association filter) has been proposed to overcome irresolvable ambiguities in the correlation function. The basic idea of this approach is convert correlation function value to the probability of position estimate being actual position of the aircraft. The data association problem between positions estimated and actual position is solved by PDAF technique. It's shown via a set of simulations that the method can improve the performance of TAN compare to TERCOM.