MEASUREMENT OF ENERGY POTENTIAL (SIGNAL-TO-NOISE RATIO) IN DIGITAL GLOBAL NAVIGATION SATELLITE SYSTEMS RECEIVERS

摘要

The energy potential of a receiver receiving signals from a navigation satellite is calculated according to an algorithm which is a function of an estimate of the mean and an estimate of the variance of a correlation signal. Improving the accuracy of measuring the energy potential may be achieved by improving the variance estimate. The variance estimate may be determined from measurements of the correlation signal over long time intervals during operation of the receiver. The variance estimate may also be determined during a calibration procedure, or by mathematical modelling of the receiver.