Open AccessFrequency ambiguity free tiered differential‐polyphase codes for GNSS signal design
Author(s) -
Han S.K.,
Kim J.B.,
Kim J.K.,
Han A.,
Kim K.J.,
Song K.W.,
Lee S.J.,
Ahn J.M.
Publication year - 2017
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2016.3680
Subject(s) - polyphase system , frequency offset , pulse repetition frequency , computer science , algorithm , offset (computer science) , decoding methods , mathematics , estimator , electronic engineering , telecommunications , statistics , engineering , radar , orthogonal frequency division multiplexing , programming language
To resolve frequency ambiguity of tiered polyphase code (TPC), a differential encoding method to the secondary code of the TPC is proposed. By performing differential decoding, the frequency ambiguity is removed and the code sequence boundary is correctly found. In addition, the correlation results at the receiver can be used as a frequency offset estimator. Analysis on the receiver operations and the simulation results show that the proposed tiered differential‐PC makes the code sequence boundary detection correctly under the frequency offset of up to several hundred hertz. The root mean squared error of the frequency offset estimation is reduced to <10 Hz under operating signal‐to‐noise power ratio which is about −35 dB.