STRICT REVERSE NAVIGATION METHOD FOR OPTIMAL ESTIMATION AND FINE ALIGNMENT

摘要

A strict reverse navigation method for optimal estimation and fine alignment, comprising: establishing an adaptive control function; forward navigating a calculation process; reversely navigating the calculation process; and performing adaptive control on the number of times of forward and reverse calculation. The method shortens the alignment time of the optimal estimation and fine alignment on the basis of ensuring alignment accuracy, can effectively solve the problem that a filtering initial value error at the initial stage of the optimal estimation and fine alignment affects a subsequent convergence speed, performs forward and reverse navigation solution multiple times at the initial stage so as to reduce an initial value error as much as possible, improves a filtering convergence speed, and along with the increasing improvement of filtering accuracy at a subsequent stage, gradually reduces the number of forward and reverse times. Because reverse solution is a strict reverse process, an approximation error is effectively avoided, error enlargement is not caused after performing forward and reverse solution multiple times, and a subsequent convergence speed is accelerated. The method uses an adaptive mode to control the number of times of forward and reverse navigation solution, thereby controlling the amount of calculation.