Research And Application Of Kalman Filter In Loran-C System

Long Range Navigation System (Loran-C) is a kind of terrestrial radio navigation system, which is widely used in the navigation domain. How to reduce the measurement error as far as possible and improve the precision of position is a key point to study. So this paper launches the discussion to this respect.This paper is focused on the processing of time difference (TD) signal with Kalman Filter. Firstly, it introduces the Loran-C system and its principle of work, analyzes the factors which affect the position precision of receiver. Secondly, it analyzes the relation between carrier moving state and time difference signal variance, presents some Kalman Filter models and the performance of Kalman Filter is discussed too; furthermore, according to the character of time difference signal variance, the project application of the filter algorithm in is analyzed. At last, it presents the hardware realization and a series of test data of the algorithm, proposes the modified two-order open loop Kalman filter algorithm which solves the problem of "Jumping Cycle".