Revising M-Layer: complex exponent representation.
Yin, Yuan Han
Ziomek, Lawrence J.
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The waveguide mode tropospheric propagation effect prediction program, M-Layer, originally written by Naval Command Control and Ocean Surveillance Center, Research, Development, Test and Engineering Division (NRaD), is revised for greater accuracy, speed and stability. The accuracy improvement is achieved first by converting the extended complex number representation into the representation by the complex exponent then by re-writting the group of Airy function computation subroutines. This accuracy improvement makes it possible to implement a selfchecking procedure for determining the proper method to evaluate the height gaing function. Finally, a new mode locating algorithm is introduced which improves the efficiency of mode search and eliminates the looping problem observed. The revision has been documented and the new program source code has been delivered to NRaD. It is also recommended that the mode search protocol, not just the mode locating algorithm introduced in in this revision, be completely revised for better performance.
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