Classifications

• • G—PHYSICS
  • G08—SIGNALLING
  • G08G—TRAFFIC CONTROL SYSTEMS
  • G08G5/00—Traffic control systems for aircraft, e.g. air-traffic control [ATC]
  • G08G5/0017—Arrangements for implementing traffic-related aircraft activities, e.g. arrangements for generating, displaying, acquiring or managing traffic information
  • G08G5/0026—Arrangements for implementing traffic-related aircraft activities, e.g. arrangements for generating, displaying, acquiring or managing traffic information located on the ground
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F41—WEAPONS
  • F41G—WEAPON SIGHTS; AIMING
  • F41G3/00—Aiming or laying means
  • F41G3/26—Teaching or practice apparatus for gun-aiming or gun-laying
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
  • G09B9/00—Simulators for teaching or training purposes
  • G09B9/003—Simulators for teaching or training purposes for military purposes and tactics
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
  • G09B9/00—Simulators for teaching or training purposes
  • G09B9/006—Simulators for teaching or training purposes for locating or ranging of objects
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
  • G09B9/00—Simulators for teaching or training purposes
  • G09B9/02—Simulators for teaching or training purposes for teaching control of vehicles or other craft
  • G09B9/08—Simulators for teaching or training purposes for teaching control of vehicles or other craft for teaching control of aircraft, e.g. Link trainer
  • G09B9/24—Simulators for teaching or training purposes for teaching control of vehicles or other craft for teaching control of aircraft, e.g. Link trainer including display or recording of simulated flight path

Definitions

• a device for real-time simulation A device for real-time simulation
• the present invention relates to a device for real-time simulation of the position of a possibly fictitious object in a three-dimensional coordinate system, comprising at least a first unit and a second unit, each one provided with a GPS-receiver for receiving position and time signals respectively from at least four satellites, furthermore a transmitter/receiver for communication between the first and second unit, preferably within the VHF- or UHF-radio frequencies, and a communication computer having memory capacity which connects the GPS-receiver and the transmitter/receiver.
• GPS-systems i.e. Global Positioning Systems
• satellites the position of which in relation to the earth is accurately determined
• possibilities of a very accurate determination of the position, also of objects in space have resulted in possibilities of a very accurate determination of the position, also of objects in space.
• the object of the present invention is thus to provide a device of the kind which is mentioned in the introduction and which is suited to many applications and has a relatively low cost when used.
• such a device is primarily characterized in that at least the first unit contains a simulation computer communicating with the communication computer and simulating the position in the coordinate system and in time of said object and communicating this information to the second unit.
• Such a device works well in the case where the number of objects is limited, i.e. if not more than some 3 - 4 objects are considered.
• STDMA Self-organizing Time Division Multiple Access
• This method is described in the International Patent Application PCT/SE92/00485 having the publication number WO 93/01576, published 21 January 1993, and in other documents.
• the communication computer in the first and second units is provided with a time base which is exactly controlled by timing signals from said satellites, said time base defining time blocks, which are standardized, are capable of being numbered and form a common, exact and predetermined repeated maximum frame, and furthermore with means for using a free time block in each maximum frame, and for automatically therein transmit a position signal between transmitter and receiver using the selected radio frequency.
• the details of the STDMA-method are exhaustively described in said International Patent Application and is only described in a summarizing way in the present context.
• the device according to the invention can be also used for collision warnings between at least a first unit and a second unit, in civil and military contexts.
• the device is characterized in that the simulation computer of the first unit both simulates the position of the first unit in the coordinate system and in time to a first table and also simulates, as guided by data communicated as to position and time for the second unit, the position of the second unit in the coordinate system in time to a second table, whereupon the simulation computer compares the first and the second tables and issues, for agreeing data as to position and time, a warning signal.
• Fig. 1 shows a principle diagram of a unit in the device according to the invention
• Fig. 2 shows a principle diagram of a simulation computer
• Fig. 3 schematically illustrates the use of the device.
• a unit according to the invention is called a transponder, and it is in Fig. 1 denoted by 1. It contains a GPS-receiver, denoted by 2, for receiving through an antenna 3 position and timing signals respectively from at least four satellites, in practical cases still more satellites.
• the GPS-system is supplemented with transmitters positioned on the ground in order to achieve full performance.
• a digital transmitter/receiver 4 is included for communication through an antenna 5 between this unit and other units, i.e. transponders, in this case within the VHF- or UHF-radio frequencies.
• a communication computer 6 having memory capacity is connected to the GPS-receiver 2 and the transmitter/receiver 4.
• a simulation computer 7 is connected to the communication computer.
• the communication computer is arranged to control the communication through the transmitter/receiver 4 according to the STDMA-method mentioned above.
• a repeated maximum time frame is schematically illustrated at the numeral 9. It comprises in the example illustrated 60 seconds, divided in 9000 time blocks, one of which being denoted by 10, each block thus comprising 6.67 ms.
• a large number of transponders can communicate their positions through an automatic allocation of the time blocks.
• the construction of the simulation computer i.e. its simulation protocol, is schematically illustrated in Fig. 2.
• the simulation core consists of a numerical integration schedule having six degrees of freedom, both for continuous and discrete dynamic systems.
• Data such as position reports from the communication computer are stored in an event input list denoted by 12.
• the event handler 13 is an input filter through which events pass before being processed in the simulation core.
• the model library 14 contains specific information on the simulation objects, e.g. robots such as Sidewinder, AMRAAM, RBS-15, Maverick, etc.
• the event output list 15 transmits data to the communication computer 16.
• a first aircraft is denoted by 16 and a second aircraft is denoted by 17, which are both provided with devices according to the invention, i.e. transponders.
• the first aircraft then continuously receives in real-time information on the path 18 of the second aircraft in the three-dimensional coordinate system.
• a firing of a robot along a path 19 is simulated, which is calculated to result in hitting a robot at a point 20 of impact.
• the information on the path 19 is transmitted to the transponder in the second aircraft and the pilot therein will, as guided by the information, change his path, so that a hit is avoided.
• the first aircraft then deviates along a path 21.
• Fig. 3 can also illustrate the use of the device for collision warnings.
• the two airplanes transmit through their transponders information to each other on their path in the three-dimensional coordinate system, as simulated forwards in time, so that the simulation computer of each transponder stores first and second tables listing the positions of the own aircraft and of the other aircraft respectively in the three- dimensional coordinate system in time, which data are illustrated by the paths 18 and 19.
• the simulation computer of each transponder stores first and second tables listing the positions of the own aircraft and of the other aircraft respectively in the three- dimensional coordinate system in time, which data are illustrated by the paths 18 and 19.
• the simulation computer By comparing the position and time data found in the two tables in the simulation computer it issues a warning signal in the case of agreeing position and time data (as is indicated by the numeral 20 in Fig. 3) and issues a warning signal, so that at least one of the aircrafts can change its path, as indicated by the numeral 21 in Fig. 3.

Landscapes

• Engineering & Computer Science (AREA)
• Theoretical Computer Science (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Business, Economics & Management (AREA)
• Educational Administration (AREA)
• Educational Technology (AREA)
• Aviation & Aerospace Engineering (AREA)
• Radar, Positioning & Navigation (AREA)
• General Engineering & Computer Science (AREA)
• Position Fixing By Use Of Radio Waves (AREA)

Priority Applications (6)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20403938

Family Applications (1)

Country Status (8)

Cited By (1)

Families Citing this family (10)

Citations (3)

Family Cites Families (1)

• 1996
  • 1996-09-18 SE SE9603411A patent/SE511553C2/sv not_active IP Right Cessation
• 1997
  • 1997-09-16 DK DK97942351T patent/DK0946934T3/da active
  • 1997-09-16 US US09/269,064 patent/US6114990A/en not_active Expired - Fee Related
  • 1997-09-16 AU AU44069/97A patent/AU4406997A/en not_active Abandoned
  • 1997-09-16 DE DE69703706T patent/DE69703706T2/de not_active Expired - Fee Related
  • 1997-09-16 WO PCT/SE1997/001566 patent/WO1998012687A1/en active IP Right Grant
  • 1997-09-16 EP EP97942351A patent/EP0946934B1/en not_active Expired - Lifetime
• 1999
  • 1999-03-17 NO NO991299A patent/NO991299L/no not_active Application Discontinuation

Patent Citations (3)

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