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Evaluation of the effect of signal reflections from the earth's surface on the quality of work of air radio monitoring systems Difference-ranging type

Keywords:

V.I. Sergeev – Ph. D. (Eng.), Dr. Sc. Candidate, MESC «Zhukovsky–Gagarin Air Force Academy» (Voronezh)
E-mail: sergeev_v@bk.ru


A methodology for estimating the statistical characteristics of errors in measuring the arrival time of the radar signal on the radio monitoring equipment in the presence of reflections from the earth's surface is developed. The method is based on the approach to estimating the arrival time of the additive mixture of direct and reflected pulses, the essence of which is that the moment of arrival of a mixture of pulses is the time of reaching its level 0,5…0,7 from the maximum value at a given time interval. It is established that under standard conditions for the use of ground-based radars, the errors in measuring the time of arrival of a signal can reach 0,4…0,6 μs. Using the well-known mathematical model of the process of functioning of a spatially distributed monitoring system of radio emission sources under interference conditions using the obtained statistical characteristics of errors in measuring the arrival time of the signal as input data, it is shown that the presence of signal re-reflections from the earth's surface leads to errors in measuring the radar coordinates with standard deviation from units of hundreds of meters to units of kilometers.

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May 29, 2020

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