Estimating moment the location of an object between the transmitter and receiver in forward-scattering radar systems
One of the relevant directions of radar equipment enhancement is its angular resolution increasing. It is especially relevant in case of malicious disabling noise interference affecting the radar. The paper shows that the problem can be solved by the additional processing of the received oscillations and the extraction of the information which is not in use at the moment. The method of selection of the desired impulse signal from the continuous noise interference which affects the monopulse radio locator through the main lobe of a directional diagram. The method is based on the selection procedure of the signal amplitude fluctuation of direction finder angle error occurring at the moment of simultaneous reception of a desired signal and an interference. The proposed algorithm requires successive implementation of the three most essential operations: process discrete counting ratings of cumulative channel by similar ratings of the difference channel discrete process, incoherent intrapulsing signal accumulation and incoherent interperiodic accumulating. The paper considers the processing algorithm, the construction pattern of the device implementing this algorithm in a digital form is suggested, the detection quality values received in the course of statistical investigation are given, the analysis of the expected benefits is conducted by evaluating signal-to-noise ratio improvement factor. For the case of simultaneous monitoring of the signal sources and the interference the paper includes output direction-finding relief diagram, alternatives of a two-dimensional relief view of the output result in co-ordinates «an angle - time delay», detection curve charts at a single and train probing signal, alternatives of a raster-type variable-intensity indicator in conventional processing and on the basis of suggested method. It is concluded that the considered algorithm of additional processing of output signals of multipulse direction finder receiver allows: to provide effective noise interference cancellation; to enhance angular resolution of a direction finder 10 times higher than the limit corresponding to of Rayleigh criterion; to locate the signal source to resolution element by angle and distance.