| Publication Date |
1990 |
| Personal Author |
Fried, W. R. |
| Page Count |
11 |
| Abstract |
The time-synchronous nature and excellent time-of-arrival (TOA) measurement accuracy of the Joint Tactical Information Distribution System (JTIDS) gives rise to its inherent capability to provide high accuracy relative and absolute navigation information to vehicles carrying JTIDS terminals. This is accomplished through the inclusion of the Relative Navigation (RELNAV) software in the terminal's operational computer program. This function has been called relative navigation because it is based on passive and active ranging to the other terminals in the net. If some of these terminals have knowledge of their geodetic position (which may be true for both stationary or moving terminals), the user can determine the absolute position in standard geodetic coordinates, as well as the relative position in an arbitrarily established grid. In order to provide the highest possible accuracy for high dynamic users, the JTIDS RELNAV function is typically interconnected with a dead reckoning system on the vehicle, such as an inertial navigation system. The dead reckoning data is mixed with the JTIDS TOA data in a recursive (e.g., Kalman) filter mechanization to determine the user's position, velocity, and time bias. The principles of operation and architecture of the JTIDS RELNAV function and the system configuration for a particular inertial interconnection are described. The RELNAV observation model, and coordinate systems are discussed. Finally, some simulation results of the system are presented. |
| Keywords |
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| Source Agency |
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| NTIS Subject Category |
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| Corporate Authors |
Hughes Aircraft Co., Fullerton, CA.; National Aeronautics and Space Administration, Washington, DC. |
| Supplemental Notes |
In AGARD, Analysis, Design and Synthesis Methods for Guidance and Control Systems 11 p. |
| Document Type |
Analytic Daughter |
| NTIS Issue Number |
199104 |
