Abstract:
A reconfigurable downconverter (10) for a multi-band positioning receiver is operable with an RF synthesizer (18) with fixed output frequency, and a fixed wideband RF input (28). The downconverter (10) includes an RF mixer (12) operable to accept a range of frequencies that encompass the GPS and Galileo frequency bands and to output a downconverted IF signal (32). A fixed frequency local oscillator signal (34) is coupled to the RF mixer (12). At least one IF processor 14 further downconverts the downconverted IF signal (32) to at least one baseband signal (22). At least one of the IF processors (14) is reconfigurable for different frequency bands.
Abstract:
A multiple channel receiver (200) includes a communications receiver synthesizer (204) and at least one numerically controlled oscillator (NCO) (406) that produce local oscillator signals that are derived from a common reference oscillator (202). A DSP (212) and CPU (214) perform automatic frequency control (AFC) by adjustment of the reference oscillator (202) based upon a signal received by a receive channel using the local oscillator signal produced by the communications receiver synthesizer (204). The CPU (214) also provides a synchronous indication of adjustments to the reference oscillator (202) to control circuitry for the at least one NCO (406) so that the configuration of the NCO (406) can be altered so as to maintain a substantially constant frequency output during the adjustment of the reference oscillator (202).
Abstract:
A method in a satellite positioning system receiver having stored almanac data including determining information for a satellite using ephemeris data (710), determining information for the same satellite using the stored almanac data (722), determining an error between the satellite information determined from the ephemeris data and the satellite information determined from the stored almanac data (730), and updating the stored almanac data based upon the error (734).
Abstract:
A mobile wireless communication device for extracting time from a spread spectrum signal including a repeating short chip code and a repeating long chip code, a ratio of the long and short chip is a non-integer having a remainder bit that accumulates over successive intervals of the chip codes. The device includes a receiver for receiving (710) the spread spectrum signal, means for determining corresponding bit numbers (720) of the long and short chip codes at a particular time, means for determining a number of accumulated remainder bits (730) as a function of the bit numbers of the long and short chip codes, and means for determining time (740) as a function of the number of accumulated remainder bits.
Abstract:
A reconfigurable downconverter (10) for a multi-band positioning receiver is operable with an RF synthesizer (18) with fixed output frequency, and a fixed wideband RF input (28). The downconverter (10) includes an RF mixer (12) operable to accept a range of frequencies that encompass the GPS and Galileo frequency bands and to output a downconverted IF signal (32). A fixed frequency local oscillator signal (34) is coupled to the RF mixer (12). At least one IF processor 14 further downconverts the downconverted IF signal (32) to at least one baseband signal (22). At least one of the IF processors (14) is reconfigurable for different frequency bands.
Abstract:
A method (200, 600) and an apparatus (700) for a wireless portable communication device (102) for determining coarse position information are provided. The wireless portable communication device (102) receives information about a plurality of visible satellites (106, 108, 110), and determines a coarse position of the wireless portable communication device (102) and uncertainty parameters expected at the coarse position, using the determined coarse position and uncertainties to acquire satellites.
Abstract:
"mensagens de assistência de gps e identificadores de emissão de dados em redes celulares de comunicações e métodos para os mesmos". mensagem de assistência de gps e identificadores de emissão de dados para transmissão para estações móveis habilitadas por gps (104) em redes celulares de comunicações (100) e métodos para os mesmos. os identificadores de emissão de dados de gps indicam se os dados de gps, por exemplo dados de efemérides e de calendário correspondentes, armazenados na estação móvel, necessitam atualização. na arquitetura de 3 geração exemplificativa (w-cdma/umts), a mensagem de assistência de gps é um bloco de informações sobre sistema (sib) e o identificador de dados de efemérides de gps e correspondente identificador de satélite é codificado em uma etiqueta de valores incluída em um bloco principal de informações (mib).
Abstract:
"mensagens de assistência de gps e identificadores de emissão de dados em redes celulares de comunicações e métodos para os mesmos". mensagem de assistência de gps e identificadores de emissão de dados para transmissão para estações móveis habilitadas por gps (104) em redes celulares de comunicações (100) e métodos para os mesmos. os identificadores de emissão de dados de gps indicam se os dados de gps, por exemplo dados de efemérides e de calendário correspondentes, armazenados na estação móvel, necessitam atualização. na arquitetura de 3 geração exemplificativa (w-cdma/umts), a mensagem de assistência de gps é um bloco de informações sobre sistema (sib) e o identificador de dados de efemérides de gps e correspondente identificador de satélite é codificado em uma etiqueta de valores incluída em um bloco principal de informações (mib).
Abstract:
A method for eliminating or reducing interference in a receiver, for example, interference in a satellite positioning system receiver caused by a co-located TDMA transmitter, including detecting (210) the presence of a jamming signal, generating a synchronous blanking signal (220), and reducing the jamming signal by blanking (230) the receiver with a blanking signal. In one embodiment, the jamming signal is detected in the receiver, for example, at a correlator output of a satellite positioning system receiver.