Aiming at the problem of cross-correlation interference in a terrestrial code division multiple access (CDMA) positioning system, this paper proposes a Pseudo-code Generation with Transform Coefficient (PGTC) model. When the receiver is trying to capture the weak signal, the working signal channel extracts code phase, Doppler frequency and other parameters from the strong signal tracking loop. By calculating the cross-correlation value of the strong and weak signals in the next cycle, the working signal channel can determine the local pseudo-code transform coefficient. The pseudo-code generator generates a new local replica pseudo-code, which tends to be orthogonal to the strong signal pseudo-code in the received signal, thereby suppressing cross-correlation interference, and the receiver can capture and track weak signal. This model comprehensively considers the working mechanism of the receiver code loop, and can simultaneously reduce the cross-correlation interference of the early, prompt and late codes of the code loop. Data bit transition will cause a non-linear change of the pseudo-code. With the assistance of AGPS providing navigation message data bits, PGTC model is suitable for the situation of data bit transition. The tracking effect of weak signal is evaluated through simulation, which shows that PGTC model can effectively suppress the cross-correlation interference.
Cross-correlation Interference Suppression Method Based on Pseudo-Code Transform Coefficient
Lect. Notes Electrical Eng.
China Satellite Navigation Conference (CSNC 2022) Proceedings ; Kapitel : 47 ; 529-540
2022-05-05
12 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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