Spaceborne Passive Localization Method for PCMA signals

Le résumé fourni par la source

Paired carrier multiple access (PCMA) is a new secure technology for satellite communication systems. In electronic reconnaissance, because the earth stations of PCMA systems share the same frequency bands and time slots, PCMA signals captured by the third party are time- and frequency-domain aliased. Therefore, this study proposes a spaceborne passive localization algorithm based on the CLEAN method, which simultaneously achieves Doppler parameter estimation for mixed PCMA signals and utilizes Doppler parameters to locate the earth stations. Terminal 1 is analyzed using binary phase-shift keying (BPSK) modulation, and Terminal 2 is assessed using quadrature phase-shift keying modulation. First, the square spectrum and short-time Fourier transform are utilized to extract the Doppler signal of Terminal 1. Second, suppression of the BPSK-modulated Doppler signal is achieved through the time–frequency-domain CLEAR method. Therefore, the Doppler signal of Terminal 2 can be extracted through the fourth-order spectrum. Estimation of the Doppler slope and zero Doppler time is realized by Hough transform. Last, the Doppler parameters are used to locate the earth stations.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.