Patent Application
20100090891
Automatic dependent surveillance-broadcast (ADS-B) is used by an air vehicle (e.g., an airplane) to periodically broadcast its position. Other air vehicles and/or ground stations having ADS-B compatible equipment can receive these broadcasts. In general, the air vehicle determines its position, for example, using a global navigation satellite system (GNSS) and then broadcasts its position using the 1090 Extended Squitter of Mode S transponders (i.e., ADS-B).
Ground vehicles are used on the airport surface and vicinity to support various functions, but typically do not include ADS-B equipment. For example, these ground vehicles include aircraft tow vehicles, baggage/cargo tugs, fuel trucks, catering trucks, de-icing vehicles, maintenance vehicles, snow plows, emergency vehicles and so forth.
In one aspect, an air and ground vehicle tracking system includes a base station configured to transmit locations of air vehicles to a radio and a GPS receiver disposed in a ground vehicle and configured to derive a location of the ground vehicle. The radio is configured to receive locations of air vehicles, receive locations of other ground vehicles and broadcast a location of the ground vehicle to the base station. The system also includes a display configured to render locations of the air and ground vehicles.
In another aspect, a method to track vehicles includes receiving a location of a first ground vehicle, broadcasting the location of the first ground vehicle, receiving locations of air vehicles, receiving locations of other ground vehicles and rendering the locations of the air vehicles and the other ground vehicle.
In a further aspect, an article includes a machine-readable medium that stores executable instructions to track vehicles. The instructions cause a machine to receive a location of a first ground vehicle, broadcast the location of the first ground vehicle, receive locations of air vehicles, receive locations of other ground vehicles and render the locations of the air vehicles and the other ground vehicles.
In a still further aspect, an air and ground vehicle tracking system includes a base station configured to transmit locations of air vehicles to a radio and a GPS receiver disposed in a ground vehicle. The vehicle positions are rendered relative to the GPS location of the ground vehicle. The radio is configured to receive locations of air vehicles, receive locations of other ground vehicles and broadcast the GPS location of the ground vehicle to the base station and other ground vehicles.
Described herein are techniques to provide ground vehicles with air vehicle (e.g., aircraft) information such as air vehicle locations and identification (ID). In particular, aircraft reports from ADS-B, for example, and/or radar may be rebroadcast to ground vehicles. In one particular example, an operator of a ground vehicle may be able to determine locations of an air vehicle at an airport from a geographic display of the airport in the ground vehicle. Also described herein are techniques which enable other ground vehicles and/or a control tower to determine the locations of ground and air vehicles at the airport.
Referring to
The system 10 also includes a base station 40 to receive and provide messages to and from the ground vehicles (e.g., ground vehicles 22a-22c) using the wireless network 32. The base station 40 provides information including identification and location of the ground vehicles to a track server 44. In one example, the track server 44 aggregates and distributes vehicle track data (e.g., air vehicle data and ground vehicle data) to the display client 82a and 82b. In one example, the wireless network 32 is an Ultra High Frequency (UHF) time division multiple access (TDMA) network operating at assigned frequencies between 450 and 480 MHz.
The system 10 also includes access points 52 (e.g., access points 52a-52b) that receive identification and location information from ground vehicles (e.g., ground vehicles 22d-22e) through the wireless network 34. In one example, the access point 52a or 52b is an 802.11g or 802.11n wireless access point, which broadcasts an SSID and accepts connections from mobile wireless devices. Once connected to the access point 52a or 52b, a ground vehicle 22a sends encrypted location reports using TCP or UDP over IPv4 and 802.11 protocols, for example. In another example, the wireless network 34 is a WLMAX 5.1 GHz network. In other examples, the wireless network 34 may a digital cell 3GSM, Evolution-Data Optimized (EVDO) or a SATCOM provided by an Internet Service Provider (ISP).
The system 10 further includes detection components 60 to determine a location of air vehicles 24a-24b using the detection network 36 to detect non-participating vehicles. The detection components 60 include an Automatic Dependant Surveillance-Broadcast (ADS-B) sensor 62, and other detection components 68 including primary radar and electro-optical sensors for example. In one example, the ADS-B sensor 62 provides aircraft position reports which are used to provide an integrated display of aircraft and ground vehicles on an airport surface to vehicle dispatch and ramp operators, vehicle operators, a control tower and pilots of the air vehicles. In one example, the detection network 36 is a Secondary Search Radar (SSR) (e.g. ASR-9, ASR-11) operating at 1.03 and 1.09 GHz. Other detection components 68 may include Air Surveillance Radar (ASR) and Airport Surface Detection Equipment (ASDE) radar.
The track server 44, the access points 52a-52b and the detection components 60 are connected to a network 74. In one example, the network 74 is a local area network (LAN). In another example, the network 74 is a wide area network (WAN). The network 74 may be a wired, wireless or a combination of a wired and wireless network. In one particular example, the network 74 includes one or more Ethernet switches providing IPv4 connectivity between components connected to the network 74.
The network 74 is connected to display clients (e.g., a display client 82a and a display client 82b) and a Surface Management System (SMS) 84. The display client 82a-82b are configured to provide displays including geographical displays of an airport and further configured to render identification and location data on air and ground vehicles. The display clients 82a-82b may be located in a control tower, ramp operators facility and so forth.
Referring to
The GPS receiver 102 uses time difference of arrival techniques using timing signals from multiple GPS satellites through the GPS antenna 104 to determine the location of the ground vehicle 22′. The location of the ground vehicle 22′ is provided to the processor 108 (e.g., an embedded processor) connected to the GPS receiver 102. In one example, the GPS receiver 102 is a Wide Area Augmentation Services (WAAS) enabled Global Positioning System (GPS) receiver for improved position accuracy.
The radio 112 broadcasts and receives messages through the wireless antenna 114. In one example, the identification and location of the ground vehicle 22′ is broadcast to the base station 40 and also to other ground vehicles. In another example, the ground vehicle 22′ receives identification and locations from the other ground vehicles. In one particular example, the messages sent by the radio 112 are in the form of encrypted packets at a configured frequency using time division multiple access (TDMA) access control. The radio 112 may provide at least one of an Ultra High frequency (UHF), a WI-FI 802.16, a Worldwide Interoperability for Microwave Access (WIMAX), Evolution-Data Optimized (EVDO) or a High-Speed Downlink Packet Access (HSDPA) wireless link.
The radio 112 is also configured to receive identification and location information of air vehicles provided by the detection components 60 using the network 74 and the base station 40. In one example, the GPS receiver 102, the processor 108 and the radio 112 are a single unit (e.g., a Raveon Technologies Corporation RV-M7 wireless modem).
Referring to
In one example, the track server component 320 includes non-real time software written in Java running on a LINUX® (or WINDOWS®) processor. Upon initialization, the track server component 320 reads the configuration parameters from a local disk. In one example, the configuration parameters include the IP multicast address(es) used for vehicle reports, and the minimum and maximum update intervals for track updates. A first thread is provided to join the vehicle multicast group, receive position updates and update the corresponding record in the vehicle track file with the latest time and position. If the previous report is older than the minimum update interval, the track update is published. Tracks may be published to subscribing automation systems as Asterix category 11 messages or via web services as XML messages over a JMS transport. A second thread is provided to identify stale tracks. A periodic timer is set to the maximum update interval. When the periodic timer expires the second thread iterates through the track file and identifies records that have not been updated. These records are marked as stale, but are re-published. This is intended to support initialization of new clients without retransmission of the entire track file. In one example, the track server component 320 identifies duplicate vehicle identifiers based on conflicting positions. In another example, the track server component 320 supports Unicast UDP and/or TCP clients.
The software architecture 300 also includes a display client 330 for providing air and ground vehicle information using a Tactical Display Framework (TDF) 332. In one example, the TDF 332 is a TDF manufactured by Raytheon Solipsys. The software architecture 300 further includes an SMS client 340 for providing air and ground vehicle information to external SMS automation 342.
Referring to
The identification of the ground vehicle 22′ and the location of the ground vehicle are broadcast (506). For example, the processor 108 receives the location of the ground vehicle 22′ from the GPS receiver 102 and the identification and location of the ground vehicle 22′ is sent from the processor 108 for broadcast by the radio 112 using the antenna 114 to the base station 40.
The locations and IDs from other ground vehicles are received (510). For example, the radio 112 receives from the base station 40 the IDs and locations of the other vehicles.
Locations of air vehicle are received (514). For example, the detection components 60 determine the locations and IDs of the air vehicles 24a-24b and provide the locations and IDs to the network 74 for broadcast to other vehicles by the base station 40 using the network 112
Air vehicle information and ground vehicle information are integrated (516), for example, by the processor 108 and rendered (520). In one example, the air vehicle information includes locations and ID of the air vehicles and ground vehicle information includes locations and IDs of ground vehicles. The air and ground vehicles are rendered on the user interface 120, for example.
Referring to
In one example, the display 550 is disposed at one of the ground vehicles (e.g., a primary ground vehicle (not shown)). The display 550 may also render a symbol (e.g., a symbol 596) to indicate the position of the primary ground vehicle so that an operator of the primary ground vehicle may determine its position relative to other vehicles (e.g., 562a, 562b, 552a, 552b). The display 550 may also include a directional symbol 598 that indicates the direction the primary ground vehicle is traveling. In one example, symbols 596 and 598 may be combined into one symbol. In other examples, the display 550 is a moving map that moves as the primary ground vehicle moves.
In other examples, the other ground vehicles 552a, 552b include their own respective display that includes relative ground and air vehicle information.
Referring to
The processes described herein (e.g., process 500) are not limited to use with the hardware and software configuration shown in
The system may be implemented, at least in part, via a computer program product, (e.g., in a machine-readable storage device), for execution by, or to control the operation of, data processing apparatus (e.g., a programmable processor, a computer, or multiple computers)). Each such program may be implemented in a high level procedural or object-oriented programming language to communicate with a computer system. However, the programs may be implemented in assembly or machine language. The language may be a compiled or an interpreted language and it may be deployed in any form, including as a stand-alone program or as a module, component, subroutine, or other unit suitable for use in a computing environment. A computer program may be deployed to be executed on one computer or on multiple computers at one site or distributed across multiple sites and interconnected by a communication network. A computer program may be stored on a storage medium or device (e.g., CD-ROM, hard disk, or magnetic diskette) that is readable by a general or special purpose programmable computer for configuring and operating the computer when the storage medium or device is read by the computer to perform the processes described herein (e.g., process 500). The processes described herein may also be implemented as a machine-readable storage medium, configured with a computer program, where upon execution, instructions in the computer program cause the computer to operate in accordance with the processes.
The processes described herein are not limited to the specific embodiments described. For example, the process 500 is not limited to the specific processing order of
The processing blocks in
Elements of different embodiments described herein may be combined to form other embodiments not specifically set forth above. Other embodiments not specifically described herein are also within the scope of the following claims.
This application claims priority to provisional application Ser. No. 61/104,309, entitled “GROUND VEHICLE TRACKING SYSTEM,” filed Oct. 10, 2008, which is incorporated herein in its entirety.
| Number | Date | Country | |
|---|---|---|---|
| 61104309 | Oct 2008 | US |
