was genau bringt das?
man muss doch auch angemeldet sein um seine position zu bestimmen oder? bei privaten gesperrten hotspots hat das dann ja keinen sinn?
erklärt mir doch bitte einmal wie das genau funktioniert? reicht da lediglich das finden des netzwerks?
mfg
cc
wifi-beacons werden min. 1x pro sekunde in die welt geswchickt, egal ob SSID an oder aus, oder verschlusselung an oder aus... das ist völlig unwichtig...!
die WPS positionsbestimmung interssiert nur die info im beacon, sprich mac-adresse und RSSI (signalstärke des wifi-routers)
info auf skyhookwireless.com, auszug:
http://www.skyhookwireless.com/howitworks/
"What is WPS?
Skyhook Wireless' Wi-Fi Positioning System (WPS) is a software-only location solution that allows any Wi-Fi-enabled mobile device to determine its position with an accuracy of 20 meters. Unlike GPS receivers, which use satellites to determine their location, WPS uses land-based Wi-Fi access points.
Over the past five years, tens of millions of Wi-Fi access points have been deployed in homes, businesses, academic institutions, and public buildings. All of these Wi-Fi base stations continuously broadcast a signal that typically reaches up to 150-200 meters in all directions. Because so many of these base stations are deployed in developed areas, their overlapping signals create a natural reference system that WPS exploits to determine location. Click here for more information about the growth of Wi-Fi.
The WPS location client identifies all of these existing Wi-Fi signals and calculates your current location using groundbreaking positioning algorithms developed by Skyhook Wireless. To deliver highly accurate results, WPS requires knowledge of the geographic location of each access point. This information is obtained by deploying hundreds of data specialists who scan and locate access points using proprietary scanning vehicles designed to build and maintain the reference database. The system also takes into account that access points are sometimes moved and helps to automatically heal the network by updating and improving the reference data in real-time.
How Does WPS Use Wi-Fi?
Because WPS leverages a network of wireless signals that grows organically as individuals and organizations deploy Wi-Fi, its coverage and accuracy is strongest in heavily populated areas, where there are more Wi-Fi signals.
Wi-Fi access points are deployed for private and public use to provide high speed wireless coverage in and around buildings. As a result, WPS has excellent coverage and performance indoors. This distinguishes WPS from other positioning systems, such as GPS, which struggle to deliver positioning information in "urban canyons" and indoor environments. Because consumers spend the vast majority of their time in these locations, WPS is the ideal system on which to base any location based service (LBS) aimed at consumers.
Within a Skyhook coverage area, WPS quickly and accurately acquires nearby access point signals, calculates the location, and returns it to the application that requested it in less than one second.
Reference Database
Skyhook Wireless has made a large investment in building an extensive coverage area for WPS in North America and is currently rolling out coverage in Europe and Asia. Users, developers, or device makers working with WPS never need to worry about the maintenance or consistency of the reference database. Skyhook frequently re-calibrates its reference data in order to maintain the same level of performance over time. In addition, the WPS location client fixes and expands the coverage area in real-time as it calculates users' locations. This unique "self-healing" mechanism of WPS addresses the continuously changing nature of this coverage network.
Configuration
WPS requires no new hardware to operate on a device - only a "thin" software client, which can be easily configured to run on any Wi-Fi-enabled device. This dramatically reduces the cost and time of deploying location-based applications or services in comparison with other positioning technologies. WPS complies with all location standards, simplifying the process of integrating with applications via standard interfaces, such as NMEA, and integrating within carrier networks via industry standards, such as SUPL. Device makers can employ many different configuration options to balance the needs for network availability, response time, and data storage in order to deliver the best user experience.
Click here to learn more about how WPS is configured to location-enable devices. Click here to see how WPS can add location to different applications and services.
Use Case
In one scenario, a mobile device user runs a location application - e.g., map navigation - to obtain directions to a business meeting. The mapping application launches the WPS client engine, which then scans the area for signals from Wi-Fi access points (APs). WPS compares each AP's unique "signature" with the reference database, which returns that AP's precise location. Typically, each scan will yield more than five signals. If a mobile device has access to a network connection, it compares the results of the scan against the central reference database; else, against a local cache of reference data. The location engine then filters out signals from access points that are not in the reference database or may have been recently moved. The resulting high confidence list of reference points is then fed into Skyhook's patented suite of positioning algorithms, which determines the user's current location to within 20 meters. The entire process takes roughly 50-100 milliseconds on mobile devices. The location result is either fed directly to the map navigation application or is combined with other positioning systems, such as GPS, for a hybrid location result."
http://www.skyhookwireless.com/howitworks/xps.php
Hybrid Offerings
WPS can be combined with one or more complementary technologies, depending on the capabilities of the device and the needs of the applications.
WPS + GPS
These two systems are complementary, because they balance each other’s strengths and weaknesses. GPS works extremely well in open, sparsely populated areas where Wi-Fi coverage is thin or non-existent. Conversely, WPS performs best in congested population centers and indoors, two difficult environments for GPS due to line-of-sight and multi-path signal issues. Devices that have both GPS and Wi-Fi hardware can deliver the best overall combined performance by deploying XPS from Skyhook Wireless.
WPS + IP Location
IP address databases have been used for many years as a crude representation of location. IP addressing can only locate a user within an Internet service provider’s service area, but its performance can be greatly improved by combining it with WPS. IP location techniques generally entail random sampling of a small set of IP addresses in order to validate location estimates. Because XPS can collect both an IP location and an accurate WPS location, it can not only improve the IP location scheme but also validate it in real time. The benefits include wider coverage for stationary Web applications and a zero-client deployment.
WPS + Cell Tower ID
Cell tower positioning has existed in several forms for more than a decade. Querying the network for the location of the tower providing wireless connectivity to a device at that moment provides the approximate location of the device. While not sufficient for most location-based services, this knowledge can be used to improve time-to-first-fix and expand overall coverage. XPS can combine cell ID and WPS to increase the location coverage for a wireless network without adding or modifying any hardware on the devices or the network.
WPS + WiMax
WiMax and Wi-Fi have many similarities, particularly in the area of base station identification. XPS can combine these two technologies, providing both the precision of WPS and the wider coverage area of WiMax.
