Pulse Delay Compensation for High Velocity Moving Vehicle Accurate Localization in Low Frequency Positioning System

The purpose of this paper is to provide a positioning algorithm for high-velocity moving vehicles by a low frequency local positioning system, such as Loren-C navigation system. The performance of the Linear Digital Averaging (LDA) depends on similarity of the reception period of consecutive pulses (i.e. Pulse Code Interval (PCI)). The velocity of the receiver changes the period of pulse reception in each PCI and distorts the average pulse. The distortion of the average pulse depends on the number of pulses and the amount of pulse delays (i.e. the difference between pulse reception period and PCI). In this paper, pulse delay threshold and consequently the velocity of receiver threshold of the acceptable average pulse distortion is analyzed. It is shown that the determined threshold of the velocity of receiver is very low for a wide variety of applications. The proposed solution to increase the velocity threshold is to compensate the pulse delays using the last estimation of the location and the velocity vector of the receiver. The proposed algorithm can be applied to design receivers for high-velocity vehicles. The simulation results confirm the convergence of the proposed positioning algorithm and the feasibility of increasing the velocity threshold by means of pulse delay compensation before the LDA.