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Topic: Assisted GPS

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	Instant Positioning Anytime with Assisted GPS and AssistNow
		Assisted GPS, or A-GPS, is a service that enables immediate positioning on demand, 24 hours a day, 7 days a week.
		Assisted GPS services enable applications that provide on the go, accurate and reliable location information with minimal maintenance.
		A-GPS can now be offered to a much broader public and the provision of instant positioning services is soon to become the next must-have feature for leisure and professional GPS-enabled devices.
	www.embeddedstar.com /weblog/2006/06/19/instant-positioning-anytime-with-assisted-gps-and-assistnow (1052 words)

	Assisted GPS - Wikipedia, the free encyclopedia
		GPS uses a network of 24 satellites to triangulate a receiver’s position and provide latitude and longitude coordinates.
		In A-GPS networks, the receiver, being limited in processing power and normally under less than ideal locations for position fixing, communicates with the assistance server that has high processing power and access to a reference network.
		Assisted GPS describes a system where outside sources, such as assistance server (Mobile Location Server) via a network, help a GPS receiver perform the tasks required to make range measurements and position solutions.
	en.wikipedia.org /wiki/Assisted_GPS (475 words)

	Radio-Electronics.Com :: Assisted GPS A-GPS
		In particular Assisted GPS (A-GPS) has been chosen as the front runner of the possible location services to be used for cell phone applications where the E911 directive has mandated the accurate location of mobile phones by the emergency services.
		The system known as Assisted GPS or A-GPS uses the mobile phone network to assist the GPS receiver in the mobile phone to overcome the problems associated with TTFF and the low signal levels that are encountered under some situations.
		This can be achieved by incorporating a GPS receiver into the base station itself, and as this is sufficiently close in position to the mobile the data received by the base station is sufficiently accurate to be transmitted on to the mobiles.
	www.radio-electronics.com /info/cellulartelecomms/location_services/assisted_gps.php (1002 words)

	GPS Terminology (Site not responding. Last check: 2007-11-02)
		The GPS carrier frequencies (1227.6 MHz and 1575.42 MHz) are in the L band.
		For GPS use, quadrifilar antennas are typically half-wavelength or quarter-wavelength size and encased in a plastic cylinder for durability.
		A GPS receiver system that would allow the receiver to detect incorrect signals being transmitted by the satellites by comparing solutions with different sets of satellites.
	www.tycoelectronics.com /gps/terminology.asp (3947 words)

	AAS Feature: Assisted GPS and the future of smartphones
		Assisted GPS, as demonstrated this week on the Nokia N95, speeds up the TTFF significantly in two ways.
		The received GPS signals are shifted in frequency due to the relative receiver-satellite motion (Doppler shift).
		Because the GPS receiver has fewer frequencies to search, it can dwell on each for a greater period of time, increasing the effective sensitivity and enabling the GPS to use signal strengths below the normal thresholds to make range measurements (for example in built-up areas where many satellites are blocked by obstructions).
	www.allaboutsymbian.com /features/item/The_future_of_GPS-equipped_smartphones.php (877 words)

	New approaches in GPS based location systems
		This server-aided GPS approach has been pioneered by Snaptrack (The company is now a part of Qualcomm) and improved upon conventional GPS performance by sharing processing and database functions between the mobile GPS receiver/processor (client) and a remote infrastructure (the server and reference network).
		The result is a highly sensitive, cost-effective, low-power, GPS receiving system that provides first fixes in a few seconds from a cold start, even when conventional GPS is unworkable or unreliable.
		Assisted GPS utilizes the complimentary nature of both approaches to overcome situational weaknesses experienced by either network or GPS approaches working alone.
	www.gisdevelopment.net /technology/gps/ma04061b.htm (457 words)

	[No title] (Site not responding. Last check: 2007-11-02)
		In assisted GPS location systems, assistance data is transmitted from a GPS ref- erence network to the concerned mobile terminal to thereby increase performance of the GPS sensor.
		If the GPS receiver at the mobile terminal device 1 does not know its approximate location, it will not be able to determine the visible satellites or estimate the range and Doppler frequency of these satellites.
		A network element for providing an assisted location service in a cellular network, said network element (10) being arranged to select at least one of predetermined reserved time portions when a location messages is to be transmitted, and to broadcast said location message within said selected time portion.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=03/28392.030403&ELEMENT_SET=DECL (3010 words)

	news aktuell GmbH :: u-blox Announces Assisted GPS Services for Faster Signal Acquisition
		A-GPS uses mobile phone networks to access satellite location data transmitted to and collected by a global monitoring network of u-blox GPS receivers.
		The benefit of A-GPS is that users receive this location information instantly rather than having to wait for the GPS receiver to acquire Ephemeris data for visible satellites, which can take from 30 seconds up to several minutes depending on conditions.
		The A-GPS service is ideal for emergency call purposes, where a users' position must be established immediately, or in weak signal environments, such as inner city urban canyons where high-rise buildings obstruct direct views to satellites making autonomous satellite acquisition very difficult.
	sev.prnewswire.com /computer-electronics/20060203/3090595en-1.html (394 words)

	PRESS RELEASE NemeriX Licenses CEVA GPS 4000 IP and Announces Assisted GPS Chipset Targeting Mobile Phone Market (Site not responding. Last check: 2007-11-02)
		Where traditional GPS systems require several minutes, time to first fix (TTFF) is accomplished in less than 1 second outdoors or 8 seconds indoors thanks to unique multi-path mitigation and over-deterministic software from CEVA.
		CEVA's GPS 4000 solution, the tenth generation of GPS technology from CEVA, delivers instant and exceptionally accurate location information to within 5 meters, even in harsh environments such as indoors and urban canyons where GPS signals are weak and satellite coverage is partial.
		GPS 4000 also slashes the "time to first fix" to 2.5 seconds when a system is first powered up.
	www.marketwire.com /mw/release_html_b1?release_id=72908 (773 words)

	Locate Networks: Our Service
		Global Positioning System (GPS) is a constellation of NAVigation Satellites with Time And Ranging (NAVSTAR), established by the U.S. Department of Defense, whose primary function is to provide measurements of location via GPS receivers.
		GPS provides satellite signals that can be processed in a GPS receiver, enabling the receiver to compute position, velocity and time.
		Wireless Assisted GPS™ tightly integrates GPS receiving capability in a wireless device with a terrestrial wireless network.
	www.locatenetworks.com /aboutus/faq.html (688 words)

	A-GPS
		The mobile receiver picks up signals from some of the GPS satellites that are simultaneously seen by a reference GPS receiver, connected to the wireless network.
		A-GPS coverage and accuracy is typically excellent just about anywhere a subscriber can go, degrading only deep inside buildings or in dense urban areas where Cell ID may still be able to produce a position.
		Assisted GPS (A-GPS) technology enhances Bell Mobility’s Roadside Assistance service by combining the accuracy of both cell sector location technology and GPS technology.
	www.gps-practice-and-fun.com /a-gps.html (4195 words)

	Session C1, Paper #1
		Network-assisted GPS method is basically a variation of differential GPS (DGPS), in which the cellular network transmits correction signal to the user equipment (UE).
		The GPS provides estimates of the camera's position at the exposure stations and the digital magnetic compass/inclinometer provides estimates of the camera's attitude.
		The GPS is also used to precisely time-tag the attitude angles and the times of exposure.
	www.ion.org /ionsite/meetings/ntm2002/C1.html (2488 words)

	Assisted GPS: A Low-Infrastructure Approach - GPS World
		GPS cell phones will enable wireless location-based services (LBS), which are emerging as a new opportunity for mobile network operators to generate new revenues.
		A cellular telephone network can assist a GPS receiver (b) by providing an initial approximate position of the receiver and the decoded satellite ephemeris and clock information.
		Assisted GPS describes a system where outside sources, such as an assistance server and reference network, help a GPS receiver perform the tasks required to make range measurements and position solutions.
	www.gpsworld.com /gpsworld/article/articleDetail.jsp?id=12287 (1447 words)

	GPS 2002: Session F6 Abstracts (Site not responding. Last check: 2007-11-02)
		SiRF meanwhile are the world´s leading suppliers of GPS enabled platforms, sit at the fore front of A-GPS development and this paper offers a rare opportunity to hear their view of the market and the key technical issues being faced.
		One key GPS receiver disadvantage is the intermittency or unreliability in indoor and difficult outdoor environments.
		GPS is compatible and interoperable with numerous other systems and sensors, and this will be also the case for Galileo.
	www.ion.org /ionsite/meetings/gps2002/F6.cfm (7314 words)

	[No title]
		Sprint further clarified that assisted GPS is its preferred long-term approach, but that it would like to have multiple mechanisms to be comfortable with E911, such as GPS with AFLT fallback.
		Sprint replied that the assisted GPS technology works well based on the trials they have participated in, but the problem is getting GPS out in the market.
		Sprint also expressed concern that assisted GPS has never been deployed or tested on a broad commercial scale and therefore, it is difficult to say definitively how well it would work in a real-life deployment.
	www.fcc.gov /911/enhanced/releases/meetingsummary062900.txt (2818 words)

	EXN.ca \| Technology
		For the technically-minded, the new hybrid wireless assisted GPS patent covers inventions for the combination of GPS and wireless network time measurements when performing position location calculations.
		In addition to the new hybrid wireless assisted GPS patent, SnapTrack says it has also been issued a patent concerning the ability to tightly integrate both GPS signal and cellular signal processing tasks within a common microprocessing unit aboard a wireless device.
		As reported previously, while traditional GPS receivers may take several minutes to provide a location fix, SnapTrack's system can locate callers in under a few seconds to within 20 meters of the true position, and in situations where standard GPS would not work.
	www.exn.ca /Stories/2000/01/04/05.asp (507 words)

	TCS Awarded Patent for Assisted GPS Precise Location Determination \| Telematics Journal
		As a user moves his or her wireless GPS device from one location to another, the locations relative to the satellites change.
		GPS devices attempting to determine their position can only communicate with a limited number of the total GPS satellites at any given time.
		In the past, the time required for lock-in and location determination using a conventional GPS receiver could take several minutes, which is unsatisfactory for many applications, and a longer time than the average wireless phone call's duration.
	www.telematicsjournal.com /content/newsfeed/6020.html (654 words)

	Wired News: GPS to Help the Blind Navigate
		Current navigation systems based on GPS provide accuracy that ranges from a couple of meters to as many as 15 meters -- too wide a range for safety, given Tormes' purpose.
		To increase accuracy, Tormes taps the space agency's own satellite navigation system, called Egnos, which verifies that signals received from GPS satellites are accurate.
		Long said devices based on GPS have given people like a blind friend of his freedom and mobility that wasn't possible before, letting them do things other people take for granted, like navigating large open areas or parking lots.
	www.wired.com /news/medtech/0,1286,59174,00.html (625 words)

	Guardian 8200 Hybrid Assisted GPS
		The Guardian 8200 uses the emergency cellular location system, called Hybrid Assisted GPS, to provide tracking capability in the most difficult of conditions where normal GPS simply won’t work.
		Autonomous GPS receivers determine their own location by internally calculating distance measurements from at least three satellites.
		A device using assisted GPS gets an “assist” signal from the wireless network, used in calculating the device’s location.
	www.equiplocate.com /guardian_8200.htm (454 words)

	Cell phone glitch throws off GPS \| CNET News.com
		A-GPS (Assisted Global Positioning System), as it's known, determines a location using a combination of software on the phone and information from satellites and the cell phone network.
		Because the A-GPS fails to boot up, any features that rely on the phone's location, including some emergency calls, Nextel's fleet locating service or its real-time weather updates, are affected to various degrees.
		A prevailing theory is that a time reference used in GPS databases reached its maximum preset number Friday, then reset to zero.
	news.com.com /2100-1039_3-5278267.html (868 words)

	Trimble Outdoors - Download Hikes and Plan Adventures Like a Backpacker Pro
		Assisted GPS offers superior performance over most conventional recreational GPS receivers when you are in the Nextel coverage area.
		When in the Nextel coverage area the GPS receiver in the phone is assisted by the cellular network.
		Faster re-acquisition: if you obstruct the sky and block some GPS satellites from a view to your phone antenna, Assisted GPS allows you to re-acquire the satellites faster when you emerge from the obstructed area.
	www.trimbleoutdoors.com /backpacker/assistedgps.aspx (336 words)

	Assisted-GPS could be the next big thing for cellphones \| TG Daily (Site not responding. Last check: 2007-11-02)
		A-GPS could cut the time drastically with the cellular telephone company performing most of the computations with an "assistance server".
		GPS is great for finding an exact location, but it can take a long time to get a position "fix" and once users receive the fix there is no way of sending the information out.
		With A-GPS' fast location fixes and the ability to upload information, phone manufactures can integrate a "panic button" on their phones - which could alert law enforcement and rescue authorities of a users' position.
	www.tgdaily.com /2005/10/31/assisted_gps (525 words)

	GPS World: Assisted GPS: using cellular telephone networks for GPS anywhere (Site not responding. Last check: 2007-11-02)
		The integration of GPS into cellular telephones enables a potentially vast array of new applications ranging from consumer gimmicks through efficiency multipliers for enterprises to lifesaving safety and security applications.
		The advantage in terms of simplifying the handset is questionable given the computational capacity of modern cell-phone and GPS chipsets.
		Of course, this time will contain an error equal to the communication latency between the network and the handset, but it is more than adequate as precise time assistance for the AGPS purposes described in the previous section.
	www.findarticles.com /p/articles/mi_m0BPW/is_5_16/ai_n13824876 (1445 words)

	SnapTrack - FAQ
		GPS signal processing is done primarily in software rather than using conventional hardware correlators.
		SnapTrack's A-GPS technology can operate in difficult environments, such as inside buildings, inside moving automobiles, under dense foliage and in urban canyons, where traditional GPS is unreliable or inoperable.
		Furthermore, when operating in a hybrid A-GPS mode, SnapTrack’s solution will always be able to return a position fix by using network ranging information to determine the location of a wireless handset should GPS information be unavailable.
	www.snaptrack.com /technology/faq.jsp (1608 words)

	CellPoint and SiRF Partner... (Site not responding. Last check: 2007-11-02)
		With this agreement, SiRF's Assisted GPS (A-GPS*) technology will be integrated with CellPoint's network-based Enhanced Cell-ID (E-Cell-ID) location platform technology, providing consumers and wireless network operators the best of both location-information systems.
		A hybrid of GPS and network-based technology offers constant, accurate location information anytime, anywhere: GPS technology can pinpoint location to within 5 to 15 meters; however, the satellite signals can be blocked in certain environments, such as inside buildings, while network-based systems, such as CellPoint's E-Cell-ID can supplement in these environments.
		GPS, Global Positioning System, uses satellites to calculate positions of devices equipped with GPS chips, on or near the earth.
	www.sirf.com /aug7.html (782 words)

	CEVA Products - Application Platforms - GPS
		A flexible, silicon-proven GPS application delivering significant advances in cost reduction, power dissipation and location performance to GPS enabled devices for the handset / telematics / automotive and consumer electronics industries.
		CEVA GPS 3000 - an assisted-GPS solution powered by a CEVA DSP core or RISC processor, combining the features of the Baseband, RF and software to enable high performance, low cost solutions for cellular, automotive and telematics.
		With it's unique coldstart performance capabilities, CEVA GPS 4000 is ideally suited for autonomous / stand-alone applications such as highly-integrated multimedia telematic systems and next generation wireless handsets.
	www.parthus.com /products/platforms/gps.php (151 words)

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