An Analysis of LORAN Errors for Simulation.
Research and development technical rept. (Final),
ARMY ELECTRONICS COMMAND FORT MONMOUTH NJ
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The report discusses the modeling of a LORAN chain for purposes of simulation as a component subsystem within a hybrid navigation system. Three areas are treated first, the basic principles and current operational practices of LORAN are reviewed second, the basic error sources and limitations of LORAN are presented and, third, a programmable error model is presented. The primary objective of the report is to evaluate the key error sources and identify causative mechanisms for those errors when LORAN is used as the position fix in the augmentation of an inertial navigation system. The basic errors discussed are atmospheric noise, chain instability, geometric dilution, and receiver dynamics. The problem of propagation anomalies warp is discussed briefly but does not figure into this particular simulation context since insufficient statistical data exists for a proper model to be constructed and, in addition, the proposed hybrid system cannot compensate for this class of error input. These errors are then formulated in terms of error mechanisms easily programmable in ALGOL for implementation on the Burroughs B-5500 computer.
- Navigation and Guidance