M-layer: NPS version

Abstract

The M-Layer program developed by NOSC has been substantially revised into a Naval Postgraduate School (NPS) version. The mode locating algorithm was re-written to take advantage of local analyticity of the mode function. The exponential complex number representation was adopted to simplify multiplication and to improve accuracy when adding two complex numbers which nearly cancel each other. A consistency condition was formulated to assure accurate and efficient evaluation of the height-gain function. As a result, this NPS version executes faster with greater stability.