RADIO RANGING, NAVIGATION, AND LOCATION SYSTEM WITH CORRECTION FOR SYSTEMATIC ERRORS

摘要

A radio ranging system has at least one receiver which receives pulses over a direct path and over a longer delayed path from each of two or more fixed repeater stations. From the reception times of pulses which have traveled over these paths at different travel times from the fixed stations, a computer calculates the hyperbolic distances separating the passive receiver and the several fixed reference stations. By interchanging the roles of the various fixed stations, the computer compares the results of timing calculations of the same distances based on the different sets of data. From this comparison, the systematic timing errors of the system can be isolated and added or subtracted from the time measuring results, leaving differential time measurements without systematic error.