Method for predicting outdoor three-dimensional space field intensity through expanded COST-231-Walfisch-Ikegami propagation model

The invention relates to a method for predicting outdoor three-dimensional space field intensity through an expanded COST-231-Walfisch-Ikegami propagation model. The method comprises the following steps: building a three-dimensional scene model from a transmitter station to a prediction regional space; carrying out field measurement according to a certain resolution ratio within a prediction region and recording wireless signal intensity information in a position, one meter far away from the ground, of the region; obtaining a vertical cross section from the transmitter station to a receiving point in a height one meter far away from the ground, and obtaining average roof height, average street width and average building spacing from the vertical cross section; predicting the intensities of signals received from measuring points; correcting the propagation models of the measuring point according to the difference delta of measured date and predicted results; obtaining vertical cross sections from the transmitter station to receiving points in other heights of the measuring points, and filtering out buildings outside a Fresnel ring from the vertical cross sections, obtaining average roof height, average street width and average building spacing again, and calculating intensities of signals received from other heights of the measuring points.