干旱区生态环境知识资源中心

This paper is concerned with the estimation of radio communication distance for wireless sensor networks when both the transmitters and receivers are arbitrarily distributed on a random rough surface such as desert, vegetation ground, sea surface and so on. First, we simulate electromagnetic wave propagation along the rough surface by; using the discrete ray tracing method (DRTM). Second, we determine three parameters necessary for evaluation of communication distance by conjugate gradient method combined with the method of least-squares. Finally we derive air analytical expression which can estimate the maximum communication distance when the input power of a transmitter and the minimum detectable electric intensity of a receiver are specified Numerical examples are also given for estimated communication distances with the deviation of rough surface height as a parameter.