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Efficient suppression of structural interference correlation receiver with autocompensator

DOI 10.18127/j20700784-201812-09

Keywords:

V.N. Bondarenko – Dr.Sc. (Eng.), Professor, Siberian Federal University (Krasnoyarsk)
E-mail: vnbondarenko@sfu-kras.ru
V.F. Garifullin – Ph.D. (Eng.), Associate Professor, Krasnoyarsk State Medical University Named After Prof. V.F. Voino-Yasenetsky
E-mail: vadimgar@mail.ru
T.V. Krasnov – Ph.D. (Eng.), Associate Professor, Siberian Federal University (Krasnoyarsk)
E-mail: krasnovtv@ya.ru
D.S. Feoktistov – Post-graduate Student, Siberian Federal University (Krasnoyarsk); Design Engineer, JSC «SPE «Radiosvyaz» (Krasnoyarsk)
E-mail: feoktistov-d-s@mail.ru


In radio navigation systems with code separation of signals, the level of mutual interference is determined by the correlation properties of the used noise-like signals. For medium-wave wide-band radio navigation system «Sprut» long-range dynamic range of signals of reference stations is 80 dB, which determines the requirements for suppression of mutual interference.
Data transmission to the radio navigation system «Sprut» is carried out in the format of a navigation signal combined navigation and communication channel. Additional phase manipulation of the navigation noise-like signal by digital message leads to deterioration of correlation properties of signals. The use of a combined channel is possible provided that the interfering signal exceeds the useful signal (the maximum remote reference station) by no more than 40 dB. This determines the need to limit the working area of the radio navigation system minimum range of 50 km.
To improve the efficiency of suppression of the adjacent-channel interference compensator must with high precision to carry out monitoring of the parameters adjacent-channel interference (time, carrier wave phase of adjacent-channel interference amplitude), as well as compensate adjacent-channel interference in real-time.
The efficiency of the compensator was evaluated on the basis of a simulation model of the functional scheme. The model simulates an additive mixture of useful noise-like signal and adjacent-channel interference with the given parameters (delay and phase, amplitude and information signal) in accordance with the given initial value, Doppler frequency shift and noise characteristics, and also implements the described algorithm of the compensator. The degree of suppression of the structural noise by the compensator is determined by the error of estimates of amplitude, delay and phase of adjacent-channel interference.
Using the compensator in 100% of the tests at the output of the useful signal receiver provides excess of the useful signal over the adjacent-channel interference at more than 1,11 dB. The 18% quantile of the γ distribution corresponds to the 4,61 dB.
The proposed adaptive compensator of adjacent-channel noise allows to increase the noise immunity of the noise-like signal receiver with MSK: the permissible level of structural noise due to the use of an adaptive compensator adjacent-channel interference increases from 40 dB to 80 dB, which corresponds to the dynamic range of signals of the support stations of radio navigation system «Sprut».

References:
  1. Bondarenko V.N. Sravnitel'nyj analiz sposobov peredachi dannyh v shirokopolosnyh radionavigacionnyh sistemah s chastotno-manipulirovannymi shumopodobnymi signalami // SFU: Tehnika i Tehnologii. 2008. T. 1. № 1. S. 92–100.
  2. Bondarenko V.N., Aleshechkin A.M., Kokorin V.I. i dr. Shirokopolosnaya radionavigacionnaya sistema dlya morskih potrebitelej / Trudy VI Ross. NTK «Sovremennoe sostoyanie i problemy navigacii i okeanografii» NO-2007. SPb. 23–25 maya 2007 g.
  3. Bondarenko V.N., Klevlin A.G. Korrelyacionnye svojstva shumopodobnyh signalov s minimal'noj chastotnoj manipulyaciej pri dopolnitel'noj cifrovoj modulyacii // Izvestia vuzov Rossii. Radioelektronika. 2008. V. 2. S. 3–10.
  4. Bondarenko V.N. Sistema kodovoj sinhronizacii priemnika periodicheskogo shumopodobnogo signala // Izvestia vuzov Rossii. Radioelektronika. 2008. V. 1. S. 3–13.

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