Narrowlane: is it worth it?

The narrowlane (NL) linear carrier phase combination is commonly used to obtain the highest positioning accuracy using the Global Positioning System because it is capable of mitigating the effect of measurement noise and multipath. However, after reviewing the effect of various error sources on linear carrier phase combinations, it is shown herein that it is theoretically possible to obtain marginally better positioning accuracy using the L1 and L2 carrier phase data independently. Numerical results indicate no difference in performance. With this in mind, the paper investigates the practical benefits of the L1 and L2 approach over the NL combination including; less reliance on L2 phase continuity; easier ambiguity resolution; and simpler navigation filter development.

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