Measurement technique for Loran-C pulse wave distortion measures and performance in an environment of noise

The Loran-C system suffers an individual additional secondary factor (ASF) error on each propagation path from a transmitter to a receiver. The authors propose a method to predict ASF error values using self-contained pulse distortion measures (change of half cycle length and envelope-to-cycle difference) on the received waves and show that the ASF error over mixed propagation paths can be reduced by these distortion measures. They describe a measurement technique for Loran-C pulse wave distortion measures and present analysis and simulation results of the performances of those measures in an environment of AWGN (additive white Gaussian noise) models