V.A. Nenashev1

1 St. Petersburg State University of Aerospace Instrumentation (SUAI) (St. Petersburg, Russia)

When forming the radar situation of the earth's surface, in order to increase its information content and extract useful information, multi-position systems for integrating radar images of different angles formed by small-sized airborne radars are used. In this case, each radar station of the multi-position system as a probing signal must have its own unique marked signal, which will allow the signals reflected from ground objects and zones to be “tied” to a specific receiving-transmitting position of the multi-position system. This requirement follows from the fact that each transceiver position emits one probing signal, and then receives all the signals reflected from the underlying surface, emitted by other radar devices of the multi-position system. Such an organization of multi-position systems requires the development of specialized systems of marked code structures of probing signals for their identification in a joint channel for complex processing of radar data. Thus, the task is to search and study new marked code structures used to generate a system of probing signals, the use of which will allow it to be «attached» to a specific receiving-transmitting position of a multi-position on-board system and identify them in a joint channel for complex data processing when forming radar images.

When solving the set scientific problem, the methodology for constructing multi-position airborne radar systems, the theory of generation and reception of marked broadband signals, methods of correlation analysis, as well as methods of simulation modeling and numerical study of echo signal systems on a computer were used.

Conduct a study on the choice of a system of probing signals with a low level of side lobes of autocorrelation functions and a uniformly distributed level of values of the cross-correlation function.

The choice of a system of probing signals has been made and the autocorrelation and cross-correlation characteristics of radar signal systems have been evaluated for the implementation of mapping modes based on complex data processing in a multi-position system of small-sized airborne radars.

The proposed systems of broadband signals are aimed at implementation in systems of high-precision determination of coordinates, as well as at providing high-probability detection of a useful signal in a complex interference environment in multi-position systems of airborne radars with high resolution in detecting physical objects, as well as in the formation of radar images. The advantages of the obtained signal systems are discussed in terms of improving the characteristics of signal compression, their detection, resolution and noise immunity in joint radio channels of distributed multiposition systems.

Nenashev V.A. Marked structures of probing signals for identification in joint channel of complex processing radar data in multiple-position system of small onboard radar. Achievements of modern radioelectronics. 2023. V. 77. № 8. P. 40–49. DOI: https://doi.org/10.18127/j20700784-202308-06 [in Russian]

1. Nenashev V.A., Sentsov A.A., Shepeta A.P. Formation of radar image the earth's surface in the front zone review two-position systems airborne radar. 2019 Wave Electronics and its Application in Information and Telecommunication Systems (WECONF). SPb. Russia. 2019. P. 1–5. http://doi.org/10.1109/weconf.2019.8840641.
2. Nenashev V.A., Sentsov A.A. Prostranstvenno-raspredelennye sistemy radiolokatsionnogo i opticheskogo monitoringa: Monografiya. SPb.: GUAP. 2022. ISBN 978-5-8088-1685-5. [in Russian]
3. Sorokin A.V., Shepeta A.P., Nenashev V.A., Wattimena G.M. Comparative characteristics of anti-collision processing of radio signal from identification tags on surface acoustic waves. Informatsionno-upravliaiushchie sistemy [Information and Control Systems]. 2019. № 1. P. 48–56. http://doi.org/10.31799/1684-8853-2019-1-48-56.
4. Nenashev V.A. Comparative characteristics of the accuracy of determining azimuthal coordinates of objects in a two-position system of small-sized airborne radars. High-tech technologies. 2021. V. 22. № 8. P. 26–33. DOI: 10.18127/j19998465-202108-05.
5. Grigor'ev E.K., Nenashev V.A., Sergeev A.M., Samokhina E.V. Poisk i modifikatsiya kodovykh posledovatel'nostey na osnove persimmetrichnykh kvaziortogonal'nykh tsirkulyantov. Telekommunikatsii. 2020. № 10. S. 27–33. [in Russian]
6. Sergeev A.M., Nenashev V.A., Vostrikov A.A. Shepeta A.P., Kurtyanik D.V. Discovering and analyzing binary codes based on mono-cyclic quasi-orthogonal matrices. Smart Innovation, Systems and Technologies. 2019. V. 143. P. 113–123. DOI: 10.1007/978-981-13-8303-8_10.
7. Mahafza B.R. Radar systems analysis and design using MATLAB. V. 3. Chapman and Hall/CRC (2016). Available from: DOI: 10.1201/b14904.
8. Mathuranathan V. Wireless Communication Systems in MATLAB: Second Edition, independently published (2020).
9. Nenashev V.A., Sinitsyn V.A., Strakhov S.A. Issledovanie vliyaniya industrial'nykh pomekh na kharakteristiki szhatie fazo-manipulirovannykh signalov v pervichnykh RLS. Innovatsionnye tekhnologii i tekhnicheskie sredstva spetsial'nogo naznacheniya: Trudy IX obshcheross. nauch.-praktich. konf. V 2-kh tomakh. SPb. 16-18 noyabrya 2016 g. SPb: Baltiyskiy gosudarstvennyy tekhnicheskiy universitet «Voenmekh». 2017. S. 351–355. [in Russian]
10. Ryzhov K.Yu., Nenashev S.A. Podavlenie bokovykh lepestkov szhatogo signala. Mezhdunarodnyy zhurnal informatsionnykh tekhnologiy i energoeffektivnosti. 2022. T. 7. № 4-1(26). S. 31–34. [in Russian]
11. Nenashev V.A., Sergeev A.M., Kapranova E.A. Issledovanie i analiz avtokorrelyatsionnykh funktsiy kodovykh posledovatel'nostey, sformirovannykh na osnove monotsiklicheskikh kvaziortogonal'nykh matrits. Informatsionno-upravlyayushchie sistemy. 2018. № 4(95). S. 9–14. DOI: 10.31799/1684-8853-2018-4-9-14. [in Russian]
12. Sergeev M.B. Nenashev V.A., Sergeev A.M. Vlozhennye kodovye konstruktsii Barkera–Mersenna–Ragkhavarao. Informatsionno-upravlyayushchie sistemy. 2019. № 3 (100). S. 71–81. DOI: 10.31799/1684-8853-2019-3-71-81. [in Russian]
13. Svid. o gos. reg. programmy dlya EVM № 2016618938 RF. Modelirovanie sposoba szhatiya FM signala pri vliyanii ak-tivnoy pomekhi dlya resheniya zadach pomekhoustoychivosti. Shepeta A.P., Nenashev V.A., Yudin I.A., Kaplin A.Yu. Zayavl. 14.06.2016. Opubl. 10.08.2016. [in Russian]
14. Nenashev V.A., Grigor'ev E.K., Sergeev A.M., Samokhina E.V. Strategii vychisleniya persimmetrichnykh tsiklicheskikh kvaziortogonal'nykh matrits kak osnovy kodov. Elektrosvyaz'. 2020. № 10. S. 58–61. DOI: 10.34832/ELSV.2020.11.10.008. [in Russian]
15. Nenashev V.A., Sergeev A.M., Vasil'ev I.A. Modelirovanie slozhnykh kodo-modulirovannykh signalov dlya sovremennykh sistem obnaruzheniya i peredachi informatsii. Sb. dokladov nauchnoy sessii, posvyashchennoy Vsemirnomu dnyu aviatsii i kosmonavtiki. V 3-kh chastyakh. Sankt-Peterburg. 08–12 aprelya 2019 g. Ch. II. SPb: GUAP. 2019. S. 413–417. [in Russian]