Locata‟s positioning technology provides positioning solutions via a network of time synchronised ground-based “pseudolite ” transceivers which can operate where GNSS is challenged. However, as Locata‟s signal propagates through the lowest atmospheric layer, tropospheric error effects are different from the case of GNSS and should be modelled properly. The aim of this research is to analyse published tropospheric delay models and propose an appropriate model for Locata. Tropospheric delay models for pseudolite-type positioning technology as well as a “length ratio ” based tropospheric model are investigated. A modified length ratio based tropospheric model, referred to here as the Locata Tropospheric Model (LTC), is introduced for use with Locata technology. Each of these models are implemented and experiments conducted to carry out performance analysis. Results show that tropospheric correction is not required for static point measurement when the “known point ” ambiguity resolution method is used. On the other hand, LTC performs better than other tropospheric models when the Locata receiver is not at a known point.
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Choudhury et al. (2009) studied this question.