Method of and apparatus for reducing cycle slippage errors in loran-C and similar radio-frequency signal reception, particularly in vehicles undergoing acceleration.

摘要

Method and apparatus of obviating cycle-locking slippage errors in reception of Loran-C and similar radio-frequency signals caused by receiver location acceleration effects and other distortion effects simulating the same, that comprises, receiving the radio-frequency signals and sampling and tracking the cycles of the signal with a time-constant filter sufficiently fast to accommodate for the largest acceleration to be experienced by the receiver location to avoid cycle slippage in locating a predetermined cycle zero crossing, and independently post-filtering sufficiently slowly to smooth the data and without interaction with said sampling.