Recommendation ITU-R P.1144-13 (11/2025) Guidelines for the application of numerical methods used in propagation methods of Radiocommunication Study Group 3
Foreword
Policy on Intellectual Property Right (IPR)
Scope
Annex
1a Bi-linear interpolation on a trapezoidal grid
1b Bi-linear interpolation on a square grid
2 Bi-cubic interpolation
3 Gaussian quadrature integration
     3.1 Single integral
     3.2 Double integral
     3.3 Algorithm to calculate Gaussian quadrature points (nodes) and weights