Optimal Parameters for the Combination of Coherent and Non-coherent Acquisition of Weak GNSS Signals

R. Yang, K.V. Ling, E.K. Poh

Abstract:	An effective method to improve acquisition sensitivity for weak signals is to increase the integration time N. However, coherent integration is sensitive to the navigation data transition which constrains the limit that coherent integration time N cannot exceed 20ms. On the other hand non- coherent integration compensates for the loss of carrier phase and navigation data transition but introduces squaring loss. Meanwhile to keep false alarm probability low, the non-coherent integration time M cannot be too large. Hence, both non-coherent and coherent integration methods are typically used in weak signal acquisition. Different combinations of (N, M) will lead to different output Signal to Noise Ratio (SNR) and detection probability given a fixed total integration time N × M. The optimal choice of (N, M) is derived by numerical analysis that provides theoretical support for the rule of thumb guideline used in practice.
Published in:	Proceedings of the ION 2013 Pacific PNT Meeting April 23 - 25, 2013 Marriott Waikiki Beach Resort & Spa Honolulu, Hawaii
Pages:	1110 - 1116
Cite this article:	Yang, R., Ling, K.V., Poh, E.K., "Optimal Parameters for the Combination of Coherent and Non-coherent Acquisition of Weak GNSS Signals," Proceedings of the ION 2013 Pacific PNT Meeting, Honolulu, Hawaii, April 2013, pp. 1110-1116.
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