I.V. Chebotar – Dr.Sc.(Eng.), Scientific and Pedagogical Worker, 

Cherepovets Higher Military Engineering Order of Zhukov School of Radio Electronics

E-mail: cvviur6@mil.ru

I.V. Laptev – Ph.D.(Eng.), Scientific and Pedagogical Worker, 

Cherepovets Higher Military Engineering Order of Zhukov School of Radio Electronics

E-mail: cvviur6@mil.ru

V.V. Pechurin – Ph.D.(Eng.), Scientific and Pedagogical Worker, 

Cherepovets Higher Military Engineering Order of Zhukov School of Radio Electronics

E-mail: cvviur6@mil.ru

M.T. Baldychev – Ph.D.(Eng.), Scientific and Pedagogical Worker, 

Cherepovets Higher Military Engineering Order of Zhukov School of Radio Electronics

E-mail: cvviur6@mil.ru

I.G. Pivkin – Scientific and Pedagogical Worker, 

Cherepovets Higher Military Engineering Order of Zhukov School of Radio Electronics E-mail: cvviur6@mil.ru

The article proposes an approach aimed on determining the coordinates of pulsed radio signal sources on the Time Difference of Arrival (TDOA) basis. The main difference from known methods, that are based on finding the time delay by measuring the difference in the arrival time of relayed signals from two or more peripheral receiving points, the proposed one allows you to find coordinateinformative parameter (KIP) without relaying the signal and in conditions of using one receiving point - an unmanned aerial vehicle equipped with radio-frequency equipment (hereinafter UAV - sensor). The idea of reducing the number of receiving points in the implementation of TDOA to one UAV sensor is based on the use of the modes features of some pulse radio signals sources, namely the formation of a pulse signal with a constant pulse repetition period for a certain period of time. The main stages of finding the time delay by one UAV sensor include the stage of forming a grid of time stamps, the stage of forming final samples of signal-noise structures and the stage of the evaluation values of the coordinate-informative parameters. The basis of the time stamp grid generation phase includes four sequentially performed steps: pulse normalization and setting the detection threshold; measurement of the pulse start time; calculation of a grid of time stamps; setting an interrupt timer based on the quantum frequency standard. The stage of forming of final samplings includes recording in-phase and quadrature implementations of the detected pulsed radio signal at the first point and subsequent observation points, during the entire time the source is in operation. Estimating the value of the coordinateinformative parameter is to find the temporal offset of the correlation maximum derived from correlation processing of the final samples signal-to-noise constructions recorded during several time points, with the reference sample, recorded at the first point of observation. To do this, the final samples from the sampling block are fed to the digital correlator. In the correlator, the module of the cross - correlation function (CCF) of the final samples is calculated. CCF is computed by discrete convolution of finite samples. The obtained values of time delays are transmitted via communication channels to a ground control and processing point, where the position lines are constructed and their intersection points are calculated based on the formation of pairs of independent measurements taking into account the geometric factor and the angle of intersection of the tangents to the position lines at their intersection point.

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