This paper discusses propagation measurements and modeling for monitoring and tracking in animal husbandry application

The practical engineering plausibility of transmission-loss inversion methods using low-cost sensor network technologies for location and tracking of small ru minants is investigated experimentally. Trans mission loss is measured in representative outdoor environments using IEEE 802.15.4 technology. The simplest possible propagation model is shown to reflect the general features of the measured propagation data. Its absolute accuracy, however, is p robably inadequate for use in a location algorith m based on model inversion without optimization of its parameters. Model calibration to reflect inter-site variation of the propagation environment is suggested as a possible way o f realizing a location system with useful accuracy and adequate portability.