Frequency ambiguity free tiered differential‐polyphase codes for GNSS signal design
Electronics Letters2017Vol. 53(9), pp. 598–600
Citations Over TimeTop 18% of 2017 papers
Shuangfeng Han, Jeong-Been Kim, Jin‐Kyung Kim, Ahmed Muddassir Han, Kee Joo Kim, Katherine Song, Sang Jeong Lee, Jae-Min Ahn
Abstract
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.
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