Enhance LANDMARC from the fundamentals

The LANDMARC system is a radio frequency identification (RFID) based location system and has attracted great attention recently. In our implementation of the LANDMARC system, we have observed that some unusual large errors occur in the traditional LANDMARC. Thus, in this study, we proposed ways of resolving these problems. There are two major ideas proposed in this study. The first one is to forsake the nearest reader with normalized weights to reduce the effects of nonlinear relationship between the tag distance and the received signal strength difference. The second one is to use another completely different calculation algorithm. This new approach is based on the distance where the traditional one is based on power. These two new methods can indeed improve accuracy apparently. It can be found that the distance based approach can have better performance than that of using forsaking the nearest reader with normalized weights.