V.N. Bondarenko - Ph.D. (Eng.), Professor, «Radioelectronic systems» Department, Engineering Physics and Radioelectronics Institute, Siberian federal university (SFU), Krasnoyarsk. E-mail: vbondarenko@sfu-kras.ru
R.G. Galeev - Ph.D. (Eng.), General Director, «NPP «Radiosvyaz», Krasnoyarsk
V.F. Garifullin - Post-graduate Student, «Radioelectronic systems» Department, Engineering physics and radioelectronics institute, Siberian federal university (SFU), Krasnoyarsk. E-mail: vadimgar@mail.ru
Т.В. Краснов - Engineer, «Radioelectronic systems» Department, Engineering physics and radioelectronics institute, Siberian federal university (SFU), Krasnoyarsk. E-mail: krasnovtv@yandex.ru

A quasi-coherent accumulation algorithm is proposed for time delay search of spread spectrum signal burst with minimum shift keying consisting of pilot and information components. Pilot component quadrature constituents inverse modulation is eliminated within data estimation formed upon current coherent accumulation of pilot component at each i-th step (i=1,?,n). Each component (pilot and information) quadrature constituents accumulations are combined resulting in quadrature correlations that used to compute the correlation module. Analysis of proposed quasi-coherent accumulation algorithm is provided. Analysis results show that the efficiency of interperiod accumulation algorithm when using both of pilot and information signal components rises up with signal-to-noise ratio (SNR) increasing h in data-symbol band: when number of periods to accumulate is 10 and SNR equals 0 dB and 10 dB noise immunity loss is about 2 dB and 0.5 dB respectively in compare with optimal algorithm (no data modulation). The interperiod accumulation algorithm with use of pilot only component loses much to quasi-coherent accumulation algorithm when using both of pilot and information signal components: when number of periods to accumulate is 10 or more and SNR equals 0 dB and 10 dB noise immunity loss is about 1 dB and 3 dB respectively.

 

1. Bondarenko V.N., Kokorin V.I. Shirokopolosnye radionavigatsionnye sistemy s shumopodobnymi chastotno-manipulirovannymi signalami. Novosibirsk: Nauka. 2011. 263 s.
2. Bondarenko V.N. Optimal'nyy algoritm poiska shumopodobnogo signala s minimal'noy chastotnoy manipulyatsiey // Radiotekhnika i elektronika. 2008. T. 53. № 2. S. 238-244.
3. Bondarenko V.N., Galeev R.G., Garifullin V. F., Krasnov T. V. Kvazioptimal'nyy algoritm poiska shumopodobnogo signala s minimal'noy chastotnoy manipulyatsiey // Uspekhi sovremennoy radioelektroniki. 2012. №9. S. 85-911.
4. Bondarenko V.N., Galeev R.G., Garifullin V.F., Krasnov T.V. Poisk shumopodobnogo signala pri nalichii pomekhi-otrazheniya // Izvestiya vuzov Rossii. Ser. Radioelektronika. 2013. №1. S. 64-70.
5. Bondarenko V.N., Bogatyryev Ye.V., Garifullin V.F., Krasnov T.V. Pomekhoustoychivost' kvazioptimal'nogo korrelyatsionnogo priyemnika shumopodobnogo signala s minimal'noy chastotnoy manipulyatsiey // Radiotekhnika i elektronika. 2013. T. 58. № 12. S. 1236-1242.
6. Tyapkin V.N., Dmitriev D.D., Moshkina T.G. Potentsial'naya pomekhoustoychivost' navigatsionnoy apparatury potrebiteley sputnikovykh radionavigatsionnykh sistem // Vestnik SibGAU. 2012. № 3 (43). S. 113-119.