V.A. Ufaev – Dr.Sc.(Eng.), Senior Research Scientist, Leading Research Scientist, 

MESC «Zhukovsky–Gagarin Air Force Academy» (Voronezh)

E-mail: andreyuff@mail.ru

M.P. Belyaev – Ph.D.(Eng.), Head of Department

MESC «Zhukovsky–Gagarin Air Force Academy» (Voronezh) 

E-mail: belyaev_mp@mail.ru

The known method of spaced pulse radar based on the reception of a probing radio pulse by an antenna oriented to the transmitter and a signal reflected from the target by a scanning antenna is not applicable for continuous radio beacons because of the impossibility of recording the moments of arrival of signals, these signals are not solvable at the angles of arrival due to the significantly higher power density of the beacon signal, scan the side lobes of the scanning antenna pattern, relative to the reflected from the target. At the same time, the principle of spaced radar with appropriate modernization is applicable in the mode of continuous radiation, what determines the relevance of the relevant development.

Purpose of article – development of a method of radar with continuous radiation of radio beacons.

On the basis of the use of the receiving antenna array under the assumption of independence of the complex envelopes of the reflected from the target and the direct beacon signal, a method of continuous radiation radar was developed.

The task of radar is reduced to a joint assessment of the envelope of radio signals of the beacon and the target, as well as the angular coordinates of the latter. Using the methods of processing a set of frequency-inseparable signals, algorithms for joint estimation of the angular coordinates of the target, the envelope of its radio signals and the beacon have been developed.

A sequential treatment procedure is proposed, which includes the determination of the angular spectrum of the received signals and, as the position of its maximum, bearing to a target, spatial synchronous filtering of beacon signals and reflected from the target with controlled zero to the target and the beacon and measurement of the delay between the filtered signals with the calculation of the range to the target.

Formulas for calculating the potential accuracy of estimates, frequency Doppler shift, field strength at the receiving point, reflection coefficient from the target and simulation results are presented. The physical interpretation of the processes of space-time processing is given, a variant of the technical implementation of the radar system is proposed.

It is established that in the direction of the lighthouse and the surrounding sector, a non-working zone is formed, where the errors of bearing and filtration sharply increase. As the signal-to-noise ratio increases, the sector narrows in the limit to a straight line. The maximum field strength from the target is achieved when it is located between the beacon and the receiving point, three times the minimum falls on the opposite direction from the receiving point. The field strength of the beacon is 65−74 dB higher than that of the target, which prevents the use of the known version of the location using scanning antennas.

The proposed method provides the location of air targets by continuous radiation of beacons while reducing the time of location. The article contains 10 figures, a list of references from 10 sources.

Ufaev V.A., Belyaev M.P. Method of radar with continuous radiation of radio beacons. Electromagnetic waves and electronic systems. 2020. V. 25. № 1–2. P. 12−21. DOI: 10.18127/j15604128-202001-2-02 (in Russian).

1. Mashkov V.G. Tekhnicheskaya ekspluatatsiya radiotekhnicheskikh sredstv poleta aviatsii: Uchebnik. Voronezh: VUNTs VVS «VVA im. Prof. N.E. Zhukovskogo i Yu.A. Gagarina». 2014 (in Russian).
2. Teoreticheskie osnovy radiolokatsii. Pod red. Ya.D. Shirmana. M.: Sov. radio. 1970 (in Russian).
3. Sychev M.I. Prostranstvenno-vremennaya obrabotka radiosignalov na osnove parametricheskogo spektralnogo analiza. Antenny. 2001. № 1(47). S. 70−77 (in Russian).
4. Ufaev V.A. Potentsialnye tochnosti dvukhsignalnogo pelengovaniya. Antenny. 2011. № 5(168). S. 44−53 (in Russian).
5. Patent RF № 2 692 467. Sposob radiolokatsii. Rospatent. 2019. Byul. № 18 (in Russian).
6. Venttsel E.S. Teoriya veroyatnostei. M.: Vysshaya shkola. 2002 (in Russian).
7. Ufaev V.A., Volobuev M.F. Izmerenie vremennogo i chastotnogo sdviga radiosignalov s primeneniem diskretnykh preobrazovanii Fure. Informatsionno-izmeritelnye i upravlyayushchie sistemy. 2016. T. 14. № 11. S. 16−21 (in Russian).
8. Korostylev A.A., Klyuev N.F., Melnik Yu.A. i dr. Teoreticheskie osnovy radiolokatsii. Pod red. V.E. Dulevicha. M.: Sov. radio. 1978 (in Russian).
9. Dolukhanov M.P. Ot milligerts do teragerts. L.: Sudostroenie. 1970 (in Russian).