{"id":77764,"date":"2018-03-09T23:23:21","date_gmt":"2018-03-09T23:23:21","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/a-fast-acquisition-and-tracking-architecture-for-a-gps-handheld-receiver-based-on-ffts\/"},"modified":"2018-03-09T23:23:21","modified_gmt":"2018-03-09T23:23:21","slug":"a-fast-acquisition-and-tracking-architecture-for-a-gps-handheld-receiver-based-on-ffts","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/tecnologia-de-las-telecomunicaciones\/a-fast-acquisition-and-tracking-architecture-for-a-gps-handheld-receiver-based-on-ffts\/","title":{"rendered":"A fast acquisition and tracking architecture for a  gps handheld receiver based on ffts"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Oihana Otaegui Madurga <\/strong><\/h2>\n<p>Titulo: a fast acquisition and tracking architecture for a gps handheld receiver based on ffts   los receptores de gps requieren un tiempo elevado para realizar la adquisici\u00f3n de la se\u00f1al. Esto es debido a que los m\u00e9todos tradicionales utilizados para estos fines requieren de un gran n\u00famero de operaciones. La adquisici\u00f3n se realiza mediante el c\u00e1lculo de la convoluci\u00f3n entre la se\u00f1al del sat\u00e9lite y la r\u00e9plica generada en el receptor. Esta convoluci\u00f3n puede ser substituida mediante una transformada discreta de fourier y calcular as\u00ed la adquisici\u00f3n en el dominio frecuencial. El objetivo de esta tesis es proponer nuevo algoritmo capaz de reducir el tiempo de adquisici\u00f3n de la se\u00f1al de gps, implement\u00e1ndolo despu\u00e9s en un prototipo de receptor dise\u00f1ado especialmente para este prop\u00f3sito. El algoritmo propuesto en el presente trabajo est\u00e1 basado en la transformaci\u00f3n al dominio frecuencial. En los \u00faltimos a\u00f1os y debido a la latente necesidad de reducir el tiempo de posicionamiento, el dominio frecuencial ha ganado gran popularidad en los receptores basados en software. Este tipo de receptores realizan todas las operaciones con se\u00f1ales almacenadas y por lo tanto no son capaces de proporcionar una posici\u00f3n en tiempo real. Adicionalmente y debido al gran n\u00famero de datos que deben procesar requieren de un pc para realizar todos os c\u00e1lculos dificultando as\u00ed la portabilidad del receptor. Hoy en d\u00eda existen algunos receptores hardware que utilizan dfts de un n\u00famero reducido de puntos obteniendo una adquisici\u00f3n con una baja resoluci\u00f3n frecuencial sobrecargando as\u00ed la fase de seguimiento de la se\u00f1al tambi\u00e9n conocido como tracking. El presente m\u00e9todo utiliza una transformada r\u00e1pida de fourier (fft) para obtener la precisi\u00f3n necesaria en la adquisici\u00f3n y no sobrecargar los lazos de control. Teniendo en cuenta que se necesita reproducir una convoluci\u00f3n, la arquitectura presentada en esta tesis necesita al menos un par de fft\/iffts . La fft de la r\u00e9plica puede ser almacenada directamente en el receptor sin necesidad de tener que calcularla y as\u00ed reducir los costes de c\u00e1lculo del algoritmo. Para mantener trackeada la se\u00f1al adquirida se necesitan como m\u00ednimo dos lazos de control. En esta tesis se presenta una arquitectura que contiene al menos dos lazos de control activos en todo momento. Pll\/fll para poder seguir la frecuencia de la portadora y un lazo dll para poder decodificar el mensaje de navegaci\u00f3n. Finalmente y para verificar tanto el algoritmo de r\u00e1pida adquisici\u00f3n propuesto como la arquitectura de seguimiento de la se\u00f1al se ha dise\u00f1ado un prototipo del receptor completo en hardware permitiendo as\u00ed verificar los algoritmos y obtener no solo el error en t\u00e9rminos de adquisici\u00f3n sino en t\u00e9rminos de la posici\u00f3n final que proporciona receptor. gps receivers spend a large amount of time performing the acquisition. This is due to the large number of operations required to perform a satellite search by using traditional searching methods. A convolution operation is necessary to acquire the signal but it can be substituted by a discrete fourier transform operation using the frequency domain transforms. In this thesis, a new method for a real time acquisition based on the frequency domain transformation is described. Due to the need of a faster acquisition of the satellite signals, the frequency domain has gained some popularity in the field of software receivers. The software implementation of the acquisition carries out all operations \u00aboff-line\u00bb by using a powerful microprocessor or a pc. The method presented in this thesis makes use of hardware ffts in order to reach high accuracy within the lowest acquisition time. The acquisition achieves a higher estimation accuracy of both code and frequency offsets. These are key factors in fast positioning. Regarding the frequency transformation, the acquisition requires at least one pair of fft\/ifft. The replica fft can be pre-calculated and stored within the memory. The tracking architecture needed to keep the visible satellites tracked in order to recover the navigation information contained in the signal is al so presented in this thesis. A common pll\/fll and dll tracking structure is used to correct the remaining signal errors: code-phase and the doppler-frequency. Finally, to verify the gps receiver with the proposed acquisition and tracking, positioning measurements are presented<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>A fast acquisition and tracking architecture for a  gps handheld receiver based on ffts<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 A fast acquisition and tracking architecture for a  gps handheld receiver based on ffts <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Oihana Otaegui Madurga <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Navarra<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 14\/12\/2005<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Andoni Irizar Picon<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: pedro Crespo bofill <\/li>\n<li>Jos\u00e9 Antonio Pe\u00f1aranda marques (vocal)<\/li>\n<li>gunter Rohmer (vocal)<\/li>\n<li>Francisco Javier Arregui san martin (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Oihana Otaegui Madurga Titulo: a fast acquisition and tracking architecture for a gps handheld receiver based on 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