METHOD FOR DETECTING AND EVALUATING RADIO-NAVIGATION SIGNAL PARAMETERS OF A SPACE NAVIGATION SYSTEM, SCATTERED BY THE AIR PURPOSE, AND DEVICE FOR ITS IMPLEMENTATION

摘要

1. A method for detecting and evaluating the radio navigation parameters of a signal from a space-based navigation system scattered by an airborne target, based on the reception of a navigation signal, two-channel correlation detection and evaluation of its parameters, while the first channel searches, detects and determines the parameters of the most powerful direct propagation signal, and in the second channel, based on the estimates of the parameters obtained in the first channel, the influence of a powerful direct propagation signal by temporarily rejecting the main th lobe of its correlation function, they search, detect and determine parameters of a less powerful scattered signal, characterized in that they remember the received input implementation, after detecting the signal in the first channel, they monitor the direct signal, form accurate estimates of its parameters, on the basis of which the signal is restored direct propagation, and in the second channel, the search, detection and evaluation of the parameters of the scattered signal are carried out as a result of correlation processing of the difference of the input implementation and the reconstructed direct propagation signal, while the range of possible delay values when searching for the scattered signal is limited on the left to the value of the preliminary estimate of the delay of the direct signal shifted to the right by the duration of one element of the ranging code of the navigation signal. 2. A device for detecting and evaluating radio navigation parameters of a signal from a space navigation system scattered by an air target, consisting of a radio frequency unit and two channels: a direct signal channel and a channel