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With A-GPS global positioning system applications to improve performance-GPS, Global Positioning Sy by wgverbv dfbdfb
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With A-GPS global positioning system applications to improve performance-GPS, Global Positioning Sy by WGVERBV DFBDFB
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| Article Posted: 02/26/2011 |
| Article Views: 89 |
| Articles Written: 1361 - MORE ARTICLES FROM THIS AUTHOR |
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With A-GPS global positioning system applications to improve performance-GPS, Global Positioning Sy |
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Use of A- GPS , Receivers do not have to download and decode the navigation data from GPS satellites, it could have more time and processing power to track the GPS signal, this can reduce the time to first fix, with the largest increase in sensitivity, and availability.
GPS is a satellite-based positioning system, it was originally designed by the U.S. military and is subject to U.S. military control, free of charge for anyone to use. The system is composed of the middle ring in 6 orbit 24 satellites, orbiting a satellite around the time of the week close to 12 hours. Each satellite continuously sent on the current time, all the satellite location and the like calendar (almanac) and the ephemeris (ephemeris) data that some of the information. GPS receivers use this information to calculating the distance between itself and the satellite. To determine the location, GPS receivers must receive signals from at least three satellites.
Figure 1: Control at the level of A-GPS
First Fix (TTFF) depends very much on the receiver's receive sensitivity, and the number of visible satellites, each satellite signal strength, the distribution of satellites in the sky and the receiver's perspective on the sky. In an adverse environment, such as the signal is weak or indoor urban high-rise space, in some cases take several minutes to calculate the position. This local service (LBS), or emergency call (E911) is unacceptable that these circumstances require a faster access time. To this end, it developed the assisted-GPS (A-GPS) to address the adverse environment TTFF problem.
A-GPS A-GPS development in part by the U.S. Federal Communicate Commission (FCC) of the E911 mandatory to provide cellular phones for emergency caller location driven. The purpose of A-GPS or improve TTFF, or when it can not improve the TTFF to locate operations when possible.
In the past few years, the key words in the A-GPS under developed different concepts and solutions, many of which are patent protected. These different concepts can be divided into supportive GPS (aidedGPS) and two types of assisted-GPS (assisted GPS).
Figure 2: The user level of the A-GPS
1. Supportive GPS Support GPS by type Mobile The network to send calendar, ephemeris, a rough location and time to improve the TTFF. This type of data you can support the control level (controlplane) to send, or mobile network, user level (userplane) on. Most occurred in computing the location of mobile devices.
2. Assisted-GPS Assisted-GPS position calculated making use of fast TTFF possible. To achieve this, using as the time synchronization more accurate location, Doppler and frequency of this additional information is used to determine the location. This additional information can be controlled by using the mobile network infrastructure level to gain, as senior forward link trilateration (AFLT) This mechanism is used to determine mobile device location. Here, the signal sent from a mobile device, several mobile base stations to receive and measure. Calculation of position occurred in the mobile device (mobile device-based) or mobile network Server On the (web-based).
Supporting mobile devices based on GPS solutions for mobile network to receive additional support to GPS data, but on mobile devices for location calculation. This means that LBS or E911 service must be from the current location of mobile devices.
Use Web-based assisted-GPS solutions, mobile device sends raw GPS data to GPS mobile network the secondary server. The network server can use directly from the network assisted GPS information to calculate the additional position. In the calculation, the location data is sent to the receiver. LBS or E911 service can directly access the network server location database.
A-GPS benefits is to improve the TTFF, increase agility and to maximize the availability of the existence of these advantages is that the receiver will no longer have to download and decode the navigation data from GPS satellites, the receiver can use more a lot of time and processing power to track the GPS signals.
Control level based on A-GPS Figure 3: ANTARIS 4 Block Diagram
Level program control functions using a wireless network, and signaling layer to obtain location information from the network, such as cell ID, AFLT or time synchronization mechanism.
CDMA And GSM cellular sector for the control plane are A-GPS messages developed a standard (respectively TIA/IS-801-1 and 3GPPTS25.331), the definition of the user equipment performance metrics (respectively, TIA 916 and 3GPP TS25 .171). These standards describe the location information from wireless networks to access, and how this information is used A-GPS.
When the control level when using A-GPS positioning measurement unit used in mobile devices, several base transceiver stations and mobile switching center measurement between the signal transmission to obtain location information. Serving mobile location center to collect these data and based on the location of the network has several reference from GPS receiver A-GPS server data, such auxiliary data is sent to mobile devices, enabling mobile devices to calculate the exact location. LBS can be the gateway mobile location center to obtain the location data.
Level by control methods, based on network or location-based mobile computing system is possible. Control level based on A-GPS system is very complex and costly to install, because a lot of additional hardware needed to handle the complex agreement, but this A-GPS system will have most of the benefits of position calculations.
Based on user-level A-GPS User level, the program is in the A-GPS server and mobile devices are based on the communication between IP data links all A-GPS system, independent of wireless signaling layer (based on GPRS-IP). The appropriate standard by the Open Mobile Alliance (OMA) to develop, known as user level security orientation (SUPL).
When the user level when using A-GPS with GPS receivers for mobile devices in the mobile network via a user level IP with A-GPS connection. A-GPS server information from several GPS receivers to collect supporting data, such as ephemeris and almanac. The server sends the requested data to mobile devices. Mobile devices using GPS receivers I am China Agriculture Net writer, reports some information about parker pen company , tech solutions paper shredder.
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