Apparatus and processes for realistic simulation of wireless information transport systems

• US 5,794,128 A
• Filed: 09/20/1995
• Issued: 08/11/1998
• Est. Priority Date: 09/20/1995
• Status: Expired due to Fees

• Current Assignee: United States Of America As Represented By The Secretary Of The Army (Government of the United States of America)
• Original Assignee: The United States Of America As Represented By The Secretary Of The Army
• Inventors: Pasirstein, Joseph, Wood, Richard W., Brockel, Kenneth H., Procopio, Victor J. Jr., Vigants, Arvids, Major, Paul A.
• Primary Examiner(s): Faile, Andrew
• Assistant Examiner(s): MOE, AUNG SOE
• Application Number:
  US08/530,921
• Time in Patent Office: 1,056 Days
• Field of Search: 455/67.1, 455/67.3, 455/67.6, 455/52.3, 455/65, 455/63, 455/67.7, 395/500, 364/578, 364/514 R, 364/514 C
• US Class Current: 455/67.11
• CPC Class Codes: H04B 17/3912 Simulation models, e.g. distribution of spectral power density or received signal strength indicator [RSSI] for a given geographic region

Abstract

Realistic models and processes for simulation of wireless information transport systems are provided which replicate all time and frequency dynamics effects on stationary and mobile communications systems. The preferred embodiment is a realsitic modeling apparatus for simulation of wireless information transport systems comprising a data entry module, a communications traffic selection module, a driver database, and voice and data input modules furnishing a simulation input to a network simulation module. The network simulation module having communications realism effects, a DIS structure, a channel error-burst model to transmit random errors, and a multipath modeling module to integrate deterministic and stochastic effects. The multipath modeling module, having a digital radio model and a Terrain-Integrated Rough Earth Model, influences the simulation inputs forming a multipath output, which is adjusted by voice and data inputs to provide a realistic, real-time simulation output signal to a display module portraying the simulated communications network and link connectivity. The network simulation module, channel error-burst model and multipath modeling module comprise a number of computer programs. A method for realistic simulation of wireless information transport systems in real-time utilizing modeling techniques and computer programs is also disclosed.

Claims

1. A realistic modeling apparatus for simulation of wireless information transport systems comprising:

a data loading means enters a plurality of data inputs and a plurality of communications performance characteristics to a communications traffic selection means, said communications traffic selection means having a plurality of command databases, a plurality of mission thread databases and a traffic scenario database;

a plurality of communications protocol parameter input selections made from said communications traffic selection means provides a selection means database output to a driver database;

said driver database converts said selection means database output into a plurality of statistical data forming a driver data output, said driver database output being transmitted to a network data input module connected to a network simulation means;

a plurality of voice inputs from an operator are sent to a voice input module, said voice input module and said network data input module providing a plurality of simulation inputs to said network simulation means;

said network simulation means, being rule-driven and multi-network capable, simulates a plurality of stationary and moving digitized communications platforms;

said network simulation means having access to a multipath modeling means, said multipath modeling means, having an ITEMM software program and a digital radio model;

said ITEMM software program integrates a plurality of deterministic communications effects and a plurality of stochastic communications effects with said plurality of stationary and moving digitized platforms;

said multipath modeling means cooperates with said network simulation means to influence said plurality of simulation inputs, converting said plurality of simulation inputs and said plurality of stationary and moving digitized platforms into a multipath output;

said digital radio model transmits said multipath output to a data terminal port, said data terminal port adjusts said multipath output and transmits a data adjusted output to said multipath modeling means;

said digital radio model transmits said multipath output to a radio control port, said radio control port adjusts said multipath output and transmits a voice adjusted output to said multipath modeling means;

a display means; and

said multipath modeling means combines said data adjusted output and said voice adjusted output with said multipath output to provide a realistic, real-time simulation output signal to said display means.

2. The realistic modeling apparatus for simulation of wireless information transport systems as recited in claim 1, further comprising said voice input module receiving a plurality of voice inputs from a plurality of operators.

3. The realistic modeling apparatus for simulation of wireless information transport systems recited in claim 2, further comprising:

said multipath modeling means providing a terrain map background displayed on said display means; and

said multipath modeling means displays said plurality of stationary and moving digitized communications platforms on said terrain map background.

4. The realistic modeling apparatus for simulation of wireless information transport systems recited in claim 3, further comprising:

said network simulation means simulates a plurality of simultaneous voice, data and imagery information exchanges;

said plurality of simultaneous voice, data and imagery information exchanges being at intranetwork and internetwork levels among said plurality of stationary and moving digitized communications platforms; and

said network simulation means combines a plurality of circuit, packet and asynchronus transfer mode switches and a plurality of net radios.

5. The realistic modeling apparatus for simulation of wireless information transport systems recited in claim 4, further comprising:

said network simulation means permits the operator to modify said selection means database output and said driver data output based on the possible scenarios encountered during simulation; and

said network simulation means is plug-and-play compatible.

6. The realistic modeling apparatus for simulation of wireless information transport systems recited in claim 5, wherein said network simulation means is configured to operate at a real-time speed, a faster than real-time speed and a near real-time speed.

7. The realistic modeling apparatus for simulation of wireless information transport systems recited in claim 6, further comprising:

said network simulation means having a Distributed Interactive Simulation (DIS) Interface structure;

said network simulation means having a DIS network for interoperability among said plurality of operators during simulation; and

said DIS network complying with a plurality of underlying DIS performance requirements and a plurality of DIS protocols.

8. The realistic modeling apparatus for simulation of wireless information transport systems recited in claim 7, further comprising:

said network simulation means provides a plurality of simulation outputs;

said plurality of simulation outputs include a plurality of network, behavior and grade of service outputs; and

said plurality of simulation outputs further comprising a plurality of message transmission delays, a plurality of network-access delays, a plurality of intranetwork routing data, a plurality of internetwork routing data and a graphic display on said computer display means.

9. The realistic modeling apparatus for simulation of wireless information transport systems recited in claim 8, further comprising:

said network simulation means providing a plurality of realistic communications effects for both stationary and on-the-move voice, data and imagery communications; and

said plurality of realistic communications effects includes a plurality of terrain error bursts, a plurality of fading error bursts in both fixed and hopping frequencies and a plurality of combined error bursts and error burst impacts with countermeasures.

10. The realistic modeling apparatus for simulation of wireless information transport systems recited in claim 9, further comprising:

said multipath modeling means having a channel error-burst model;

said channel error burst model providing a plurality of Received Signal Strength (RSS) effects caused by error bursts in the digital bit stream due to both short and long-term variations of RSS; and

said plurality of RSS effects includes a plurality of time rate RSS variations which increase with vehicle speed.

11. The realistic modeling apparatus for simulation of wireless information transport systems recited in claim 10, further comprising said network simulation means having a means for simulating radio attributes, a means for simulating countermeasure signals, a means for simulating platform environment, a propagation variability means and a noise variability means.

12. The realistic modeling apparatus for simulation of wireless information transport systems recited in claim 11, wherein:

said multipath modeling means computes in real-time a plurality of error-burst effects, a plurality of link margins and a plurality of terrain-shadowing effects combined with a plurality of multipath effects;

said ITEMM software program of the multipath modeling means simulates a plurality of real-time, link-level communications impairments for voice or date bytes transported over said digital radio model; and

said plurality of real-time, link-level communications impairments include error bursts, signal fades, signal propagation interference due to terrain shadowing, destructive multipath effects and moving platforms.

13. The realistic modeling apparatus for simulation of wireless information transport systems recited in claim 12, further comprising said display means displays a pictorial representation of link connectivity to the operator.

14. The realistic modeling apparatus for simulation of wireless information transport systems recited in claim 13, wherein said network simulation means, said channel error-burst model, said digital radio model and said multipath modeling means are computer programs.

15. The realistic modeling apparatus for simulation of wireless information transport systems recited in claim 14, wherein:

said network simulation means is a Real-Time Communications Network Simulator (RTCNS); and

said multipath modeling means is an Integrated Terrain-Environment Multipath Model (ITEMM).

16. The realistic modeling apparatus for simulation of wireless information transport systems recited in claim 3, wherein said terrain map background is provided by a Terrain-Integrated Rough Earth Model of said multipath modeling means.

17. A method for realistic simulation of wireless information transport systems comprising the steps of:

entering a plurality of data inputs and a plurality of network performance characteristics into a communications traffic selection means, said communications traffic selection means having a plurality of command databases, a plurality of mission thread databases and a traffic scenario database;

making a plurality of communications protocol parameter input selections from said communications traffic selection means;

providing a selection means database output from said communications traffic selection means database to a driver database;

converting said selection means database output in said driver database into a plurality of statistical data, and transmitting a driver database output from said driver database to a network data input module connected to a network simulation means;

inputting a plurality of voice information from an operator to a voice input module, said voice input module-and said network data input module providing a plurality of simulation inputs to said network simulation means;

said network simulation means, being rule-driven and multi-network capable, simulates a plurality of stationary and moving digitized communications platforms, said network simulation means having access to a multipath modeling means, said multipath modeling means having an ITEMM software program and a digital radio model;

converting said plurality of simulation inputs and said plurality of stationary and moving digitized communications platforms into a multipath output, within said ITEMM software program, by integrating a plurality of deterministic communications effects and a plurality of stochastic communications effects with said plurality of stationary and moving digitized platforms, said network simulation means cooperating with said multipath modeling means;

transmitting said multipath output from said digital radio model to a data terminal port;

adjusting said multipath output in said data terminal port and transmitting a data adjusted output to said multipath modeling means;

transmitting said multipath output from said digital radio model to a radio control port;

adjusting said multipath output in said radio control port and transmitting a voice adjusted output to said multipath modeling means;

connecting said network simulation means and said multipath modeling means to a display means; and

combining said data adjusted output and said voice adjusted output with said multipath output in said multipath modeling means to provide a realistic, real-time simulation output signal to said display means.

18. The method for realistic simulation of wireless information transport systems recited in claim 17, further comprising receiving a plurality of voice inputs in said voice input module from a plurality of operators.

19. The method for realistic simulation of wireless information transport systems recited in claim 18, further comprising:

displaying a terrain map background from said multipath modeling means on said display means; and

displaying said plurality of stationary and moving digitized communications platforms on said terrain map background of the multipath modeling means.

20. The method for realistic simulation of wireless information transport systems recited in claim 19, further comprising:

simulating a plurality of simultaneous voice, data and imagery information exchanges in said network simulation means;

said plurality of simultaneous voice, data and imagery information exchanges being at intranetwork and internetwork levels among said plurality of stationary and moving digitized communications platforms; and

said network simulation means combining a plurality of circuit, packet and asynchronus transfer mode switches and a plurality of net radios.

21. The method for realistic simulation of wireless information transport systems recited in claim 20, further comprising:

permitting the operator to modify said selection means database output and said driver data output, using said network simulation means, based on the possible scenarios encountered during simulation; and

said network simulation means is plug-and-play compatible.

22. The method for realistic simulation of wireless information transport systems recited in claim 21, further comprising configuring said network simulation means to operate at a real-time speed, a faster than real-time speed and a near real-time speed.

23. The method for realistic simulation of wireless information transport systems recited in claim 22, further comprising:

said network simulation means having a Distributed Interactive Simulation (DIS) Interface structure;

said network simulation means having a DIS network for interoperability among said plurality of operators during simulation; and

said DIS network complying with a plurality of underlying DIS performance requirements and a plurality of DIS protocols.

24. The method for realistic simulation of wireless information transport systems recited in claim 23, further comprising:

providing a plurality of simulation outputs from said network simulation means;

said plurality of simulation outputs include a plurality of network, behavior and grade of service outputs; and

said plurality of simulation outputs further comprising a plurality of message transmission delays, a plurality of network-access delays, a plurality of intranetwork routing data, a plurality of internetwork routing data and a graphic display on said computer display means.

25. The method for realistic simulation of wireless information transport systems recited in claim 24, further comprising:

providing a plurality of realistic communications effects from said network simulation means for both stationary and on-the-move voice, data and imagery communications; and

said plurality of realistic communications effects includes a plurality of terrain error bursts, a plurality of fading error bursts in both fixed and hopping frequencies and a plurality of combined error bursts and error burst impacts with countermeasures.

26. The method for realistic simulation of wireless information transport systems recited in claim 25, further comprising:

providing a plurality of Received Signal Strength (RSS) effects caused by error bursts in the digital bit stream due to both short and long-term variations of RSS from a channel error-burst model of said multipath modeling means; and

said plurality of RSS effects includes a plurality of time rate RSS variations which increase with vehicle speed.

27. The method for realistic simulation of wireless information transport systems recited in claim 26, further comprising said network simulation means having a means for simulating radio attributes, a means for simulating countermeasure signals, a means for simulating platform environment, a propagation variability means and a noise variability means.

28. The method for realistic simulation of wireless information transport systems recited in claim 27, further comprising:

computing a plurality of error-burst effects, a plurality of link margins and a plurality of terrain-shadowing effects combined with a plurality of multipath effects in real-time in said multipath modeling means;

simulating within said ITEMM software program a plurality of real-time, link-level communications impairments for voice or data bytes transported over said digital radio model; and

said plurality of real-time, link-level communications impairments include error bursts, signal fades, signal propagation interference due to terrain shadowing, destructive multipath effects and moving platforms.

29. The method for realistic simulation of wireless information transport systems recited in claim 28, further comprising displaying a pictorial representation of link connectivity to the operator on said display means.

30. The method for realistic simulation of wireless information transport systems recited in claim 29, wherein said network simulation means, said channel error-burst model, said digital radio model and said multipath modeling means are computer programs.

31. The method for realistic simulation of wireless information transport systems recited in claim 30, wherein

said network simulation means is a Real-Time Communications Network Simulator (RTCNS);

and

said multipath modeling means is an Integrated Terrain-Environment Multipath Model (ITEMM).

32. The method for realistic simulation of wireless information transport systems recited in claim 19, wherein said terrain map background is provided by a Terrain-Integrated Rough Earth Model of said multipath modeling means.