Benefits of long coherent integration for CZT-based GPS signal acquisition

Bing Xu, Jie Dou, Lei Dou (Corresponding Author)

Research output: Journal article publicationJournal articleAcademic researchpeer-review


Due to its flexibility in calculating frequency spectrum, the chirp z-transform (CZT) has been used in various applications where high-frequency resolution is desirable, e.g. the acquisition of global positioning system (GPS) signals. However, the CZT is very time consuming when dealing with the very large size of input data. Thus, typically, only 1 ms data is used for GPS signal acquisition. In this Letter, the authors improve the acquisition precision and sensitivity of the CZT-based acquisition by extending coherent integration time. To reduce computation load, they introduce a down-sampling operation to the extended data without degrading acquisition performance. Results show that the CZT-based acquisition with a coherent integration time of 10 ms obtains a frequency error of 5.9 Hz for the carrier-to-noise ratio (CNR) of 25 dB-Hz and can acquire signals with a CNR down to 22 dB-Hz.
Original languageEnglish
JournalElectronics Letters
Issue number16
Publication statusPublished - 1 Aug 2018
Externally publishedYes


  • Global Position System (GPS)
  • Signal detection
  • Transforms
  • signal sampling
  • Frequency error
  • CNR
  • Carrier-to-noise ratio (CNR)
  • down-sampling operation
  • computation load reduction
  • coherent integration time
  • acquisition precision
  • Global Positioning System signals
  • high-frequency resolution
  • chirp z-transform
  • frequency spectrum
  • CZT-based GPS signal acquisition


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