Abstract: In analysis of the serious interference, low accuracy and other drawbacks of the existing typical positioning methods,a location algorithm based on virtual signal strength was proposed. This algorithm technically introduces the concept of the virtual signal strength and constructs virtual space with a classic radio propagation model in location area. Besides, "Function is brought in our algorithm to reduce the shadow effect caused by Q, a standard deviation of normal random variable. The simulation experimental results show that compared with the classical LANDMARC and VIRE, our algorithm has high accuracy and effectively solves the actual interference problem brought in the deployment of hig卜density reference tags.

Key words: RFID, Virtual signal strength(VSS)，Indoor location