Gps sirf
The results and architecture used for these tests demonstrate the feasibility of the SiRFstarl/LX GPS receiver as a low power, reliable navigation component for vehicle location information as part of an ITS system.
![gps sirf gps sirf](https://p.globalsources.com/IMAGES/PDT/BIG/829/B1050874829.jpg)
These results were obtained in a GPS only environment with further improvements expected through data sharing via vehicle motion sensors and spatial map information. Other GPS receivers tested showed lesser navigation availability under the same conditions. Multiple test data will show that the navigation solution availability with the SiRFstarl and the SiRFstarl/LX GPS receiver maintain the near 100 percent contiguous coverage. The data was then analyzed under varying scenarios to investigate the ability of this Low power generation GPS technology to provide similar performance to the SiRFstarl and superior performance to the competition. To ensure fairness of performance, several platforms well as competitive GPS receivers were operated under the same navigation environment.
![gps sirf gps sirf](https://www.dhresource.com/albu_237746339_00/1.0x0.jpg)
To ensure that the previously achieved benchmarks for tracking and performance set by the SiRFstarl (GSP1, GRF1) were not degraded due to lower power versions SiRFstarl/LX, a test vehicle was used to collect GPS position data under normal traffic conditions in downtown San Francisco (a difficult urban area for signal reception). The GRF1LX chip (55 Ma 3.3 V) enjoys a decrease in power consumption by over 15 % compared to its predecessor the GRF1 (65 ma 5V) for a combined overall decrease of 71 % for the SiRFstarl/LX while maintaining continuous 1Hz measurements and all enhanced features of the receiver. The improvements to the GSP1 (175 ma 5 v) digital chip to the low power version, GPS1LX (50 ma 3.3 V) created an decrease in required power by 71 %. Taking advantage of already on board memory and processors, chip level integration of navigation technology can be achieved.
#Gps sirf software
Recent advances in silicon, GPS chipset architecture and software technology have enabled new methods to increase the signal availability (through rapid signal acquisition), accuracy and use of GPS solutions in difficult satellite tracking environments (using 1or 2 satellites for updates). Most GPS systems have been designed as stand-alone board level solutions that can be used in high-level system integration. Due to limited market availability of key components and low demand, the SiRF-4 family of GPS products is no longer supported. This improved chip set architecture enables lower power consumption without sacrificing tracking or navigation performance specifically in difficult urban canyons. to develop the SiRFstan/LX GPS chip set (GSP1LX and GRF1LX).
![gps sirf gps sirf](https://www.rlocman.ru/i/Image/2010/07/06/4.jpg)
Increased pressure on in-vehicle sensor power consumption has driven SiRF Technology Inc. The Global Positioning System (GPS) has been proposed as a potential technology to provide this information but has been hampered by poor performance (in urban environments) and power hungry board level solutions. Intelligent Transportation Systems (ITS) require reliable location information with emphasis being put on sensor level integration and low power consumption.