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Title: Cálculo de la posición y tiempo GNSS mediante un algoritmo de Coarse-Time
Author: Villalba Castro, Miguel
Director: Cobo Rodríguez, Germán
Tutor: López Salcedo, José Antonio
Keywords: snapshot
Issue Date: 13-Jan-2020
Publisher: Universitat Oberta de Catalunya (UOC)
Abstract: Geolocation is one of the functionalities used in devices such as the known wearables or smartwatches and in many industries such as aeronautics, naval, etc. To do this, these devices must have GNSS receivers. Within GNSS receivers, there are so-called snapshot receivers that offer different functionalities compared to conventional receivers. The implementation and improvement of an algorithm that makes it possible to calculate the position and estimate the clock of a snapshot GNSS receiver is the main objective of this work. Initially, after a measurement of raw data, thanks to MatLab simulations from captures made with an API provided by Google, absolute pseudoranges, the Doppler effect and the signal carrier to noise ratio are calculated. This will allow the exposure of an algorithm based on the pseudoranges. Thanks to a modification of the absolute pseudoranges the ambiguous pseudoranges are obtained, and in this way a simulation of the operation of a snapshot GNSS receiver is achieved. Peterson's algorithm has been selected for use in different scenarios, proving to be highly sensitive to the initial conditions. Subsequently, a series of improvements have been implemented to obtain an increase in system stability and a reduction in the weaknesses found in the Peterson algorithm. Thanks to these improvements, it is possible to obtain the location in an agile way, starting from an a priori position, in addition to a clock stability of the order of = 25 ms.
Language: Spanish
Appears in Collections:Bachelor thesis, research projects, etc.

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