abstract
- Several established mapping function models are in the form of continued fractions that need many operations in calculation. That’s why the mapping function models need to be modified to allow faster calculation. There are 7 mathematical operations for UNBab mapping function for getting the mapping function value. The ability to calculate mapping function value down to 2 degree of elevation angle is the unique character for UNBab mapping function to be modified. Regression method can be used to modified the mapping function model and also can produce the same result. The sum of errors calculation shows that the deviation of the modified models from the original models is not significant.