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| title | chunk | source | category | tags | date_saved | instance |
|---|---|---|---|---|---|---|
| Automatic vehicle location | 2/2 | https://en.wikipedia.org/wiki/Automatic_vehicle_location | reference | science, encyclopedia | 2026-05-05T12:51:24.823671+00:00 | kb-cron |
=== Consumer and OEM services === OEM services Many modern vehicles are equipped with factory-installed (OEM) AVL systems. These provide a range of personal convenience features, such as the ability to locate your car in a large parking lot, receive remote diagnostics, and get emergency assistance via services like eCall. Stolen vehicle recovery A primary consumer application, AVL systems can be activated after a theft to help law enforcement locate and recover the vehicle. Usage-based insurance (UBI) Insurance companies use AVL data to offer policies with premiums based on a driver's actual mileage and driving habits.
=== Construction and heavy equipment === In the construction sector, AVL is used for asset tracking to track and trace high-value assets like heavy equipment and vehicles. This helps to prevent theft, monitor asset utilization to ensure machinery is being used efficiently, and improve overall project management.
=== Agriculture and smart farming === In modern precision agriculture, AVL is essential for managing and automating farm operations. The technology is installed on machinery like tractors and harvesters to provide location data. This enables automated steering systems that improve field efficiency, allows for the exact mapping of crop yields, and helps manage the fleet of equipment during planting and harvesting. This data forms the basis of a managing information system for precision farming, which helps optimize resource use and improve crop management.
== History of development == Automatic vehicle location technologies developed from early radio-based systems to the satellite-based standard used today.
=== Early radio-based systems === Before satellite navigation, early forms of AVL relied on terrestrial radio systems. One of the first methods was radio direction finding (RDF), which used triangulation to estimate the location of a vehicle's transmitter based on its signal's bearing from two or more fixed radio sites. While functional, its accuracy was limited. In the 1970s, some systems were developed that adapted the marine-based LORAN-C navigation system for vehicle use. A LORAN receiver in the vehicle would calculate its latitude and longitude and transmit the data via a two-way radio to a central dispatch, where the location would be plotted on a map. These systems were functional in coastal areas but were often susceptible to electrical interference in urban environments, which could disrupt the low-frequency radio signals.
=== Signpost systems === For vehicles operating on fixed routes, such as public transit buses or trains, signpost systems were an effective early solution. These systems used strategically placed transmitters, or "signposts," along a route. As a vehicle passed a signpost, a reader on the vehicle would receive a unique signal and transmit that event back to a central control system. This allowed dispatchers to track a vehicle's progress along its route and determine if it was on schedule. This method was particularly useful in tunnels or urban canyons where other radio signals were unreliable.
=== Advent of GPS and modern telematics === The widespread availability and decreasing cost of the Global Positioning System (GPS) changed AVL technology. GPS provided far greater accuracy and global coverage than previous systems and was largely immune to the electrical interference that plagued earlier radio-based methods. The modern AVL standard quickly became a GPS receiver in the vehicle that communicates its location data back to a dispatch center via cellular (GSM/GPRS) or satellite networks. This shift made AVL technology more reliable and affordable, which led to modern telematics, where simple location tracking evolved to include a wide range of data points such as driver behavior, fuel consumption, and vehicle diagnostics. This technology is now fundamental for managing large commercial fleets and providing mandated location data for emergency services like Enhanced 9-1-1.
== See also == Fleet telematics GPS tracking Intelligent transportation system Tracking system Vehicle tracking system Real-time locating system
== References ==