Coherent integration time limit of a mobile receiver for indoor GNSS applications |
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Authors: | Ali Broumandan John Nielsen Gérard Lachapelle |
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Institution: | (1) Schulich School of Engineering, Position Location and Navigation (PLAN) Group, University of Calgary, 2500 University Drive, NW, Calgary, AB, T2N 1N4, Canada |
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Abstract: | There is an emerging requirement for processing global navigation satellite system (GNSS) signals indoor where the signal
is very weak and subjected to spatial fading. Typically, longer coherent integration intervals provide the additional processing
gain required for the detection and processing of such weak signals. However, the arbitrary physical motion of the handset
imputed by the user limits the effectiveness of longer coherent integration intervals due to the spatial decorrelation of
the multipath-faded GNSS signal. In this paper, limits of coherent integration due to spatial decorrelation are derived and
corroborated with experimental verification. A general result is that the processing gain resulting from direct coherent integration
saturates after the antenna has moved through a certain distance, which for typical indoor propagation, is about half a carrier
wavelength. However, a refined Doppler search coupled with a prolonged coherent integration interval extends this limit, which
is effectively a manifestation of selective diversity. |
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Keywords: | |
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