Patent
GPS receiver having improved signal acquisition at a low signal to noise ratio
TLDR
In this paper, a GPS receiver adjusts a local frequency for iteratively downconverting raw GPS signal samples to baseband GPS signal code data, combining a plurality of code epochs of the GPS signal data in chunks and super chunks for providing representative code epoch, and correlates the representative codes epochs to a replica code epoch for providing correlation times.Abstract:
A GPS receiver having a fast acquisition of a GPS signal having a low signal-to-noise ratio. The GPS receiver adjusts a local frequency for iteratively downconverting raw GPS signal samples to baseband GPS signal code data, combining a plurality of code epochs of the GPS signal code data in chunks and super chunks for providing representative code epochs, and correlates the representative code epochs to a replica code epoch for providing correlation times. A microcontroller processes the correlation times for providing the frequency corrections and computes a GPS pseudorange when the error in the corrected local frequency is less than a threshold. The GPS pseudoranges for several GPS satellites are transmitted back to the base for computing the GPS-based location of the GPS receiver.read more
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Patent
Methods and apparatuses for beacon assisted position determination systems
TL;DR: In this article, microcell beacons are used to broadcast location information and identification information to improve the precision of position solutions in a wide area position determination system (e.g., a GPS system, an AFLT system, or a hybrid system).
Patent
Ultra-tightly coupled gps and inertial navigation system for agile platforms
TL;DR: In this paper, an Ultra-Tightly Coupled GPS-inertial navigation system for use in a moving agile platform includes a range residual extractor that uses best curve fitting of a third order polynomial for estimating range residual.
Patent
Mobile handset with position calculation function
TL;DR: In this article, a mobile handset that is equipped with both position calculation means using radio waves from GPS satellites and position calculation mean using RF carriers from cellular base stations is presented, which is combined and weighted with GPS positioning reliability and cellular positioning reliability, and a weighted mean of these results is then output as a final position calculation result.
Patent
Method and System for Processing Positioning Signals Based on Predetermined Message Data Segment
TL;DR: In this article, a method and system for determining a geolocation of an object includes collecting a positioning signal including a predetermined message data segment, and a time of arrival of the message segment may be determined in the positioning signal.
Patent
GPS receiver using stored navigation data bits for a fast determination of GPS clock time
TL;DR: In this paper, the GPS receiver includes a signal processor for receiving GPS signals from GPS satellites and detecting current GPS data bits carried by the respective GPS signals, a chapter memory for storing a block of expected GPS data bit for each of the GPS satellites, and a GPS time detector for detecting a successful match when a chunk of the expected data bits within a selected search range within the block matches the current data bits, and using the successful match for determining the GPS clock time.
References
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Patent
GPS receiver having power management
TL;DR: In this article, a GPS receiver with a low power mode of operation in one embodiment includes an antenna which receives GPS signals at an RF frequency from in view satellites; a downconverter coupled to the antenna for reducing the RF frequency of the received GPS signals to an intermediate frequency (IF); a digitizer coupled to GPS signals and sampling the signals at a predetermined rate to produce sampled IF GPS signals.
Patent
Highly parallel GPS correlator system and method
TL;DR: In this article, a method and apparatus of acquiring and tracking satellite positioning system signals in a highly parallel correlator is described, where a pseudo-random noise correlation operation is performed on an input SRS signal to provide a correlated output.
Patent
Method and apparatus for adaptively processing GPS signals in a GPS receiver
TL;DR: In this article, a method and apparatus for adaptively processing Global Positioning System (GPS) signals in a GPS receiver is disclosed. But this method is limited to the use of a single GPS receiver.
Patent
Method for improving signal acquistion in a global positioning system receiver
TL;DR: In this paper, a method and system improves signal acquisition in a Global Positioning System (GPS) receiver by providing information to focus the acquisition search in the receiver, which can rapidly acquire satellites and compute its position in environments where conventional, stand-alone GPS receivers cannot.
Patent
Coaxial resonant slot antenna, a method of manufacturing thereof, and a radio terminal
Ken Takei,Mikio Kuwahara,Okabe Hiroshi,Hiroshi Kishida,Kazuyuki Hori,Yoshitaka Imakado,Nomura Tomonori +6 more
TL;DR: In this article, a coaxial resonant slot antenna has been proposed to further reduce the dimensions of radio terminals incorporating such an antenna, and a method of fabricating such a antenna and a radio terminal has been described.