A Review on Sensor Network Issues and Robotics <s> Ultrawideband and FM Radio Based <s> The advances in localization based technologies and the increasing importance of ubiquitous computing and context-dependent information have led to a growing business interest in location-based applications and services. Today, most application requirements are locating or real-time tracking of physical belongings inside buildings accurately; thus, the demand for indoor localization services has become a key prerequisite in some markets. Moreover, indoor localization technologies address the inadequacy of global positioning system inside a closed environment, like buildings. Based on this, though, this paper aims to provide the reader with a review of the recent advances in wireless indoor localization techniques and system to deliver a better understanding of state-of-the-art technologies and motivate new research efforts in this promising field. For this purpose, existing wireless localization position system and location estimation schemes are reviewed, as we also compare the related techniques and systems along with a conclusion and future trends. <s> BIB001 </s> A Review on Sensor Network Issues and Robotics <s> Ultrawideband and FM Radio Based <s> Localization plays an essential role in many ubiquitous computing applications. While the outdoor location-aware services based on GPS are becoming increasingly popular, their proliferation to indoor environments is limited due to the lack of widely available indoor localization systems. The de-facto standard for indoor positioning is based on Wi-Fi and while other localization alternatives exist, they either require expensive hardware or provide a low accuracy. This paper presents an investigation into localization system that leverages signals of broadcasting FM radio stations. The FM stations provide a worldwide coverage, while FM tuners are readily available in many mobile devices. The experimental results show that FM radio can be used for indoor localization, while providing longer battery life than Wi-Fi, making FM an alternative to consider for positioning. <s> BIB002
Technique. To achieve high bandwidth connections with low-power consumption ultrawideband is the best communication method. Ultrawideband wireless radios send short signal pulses over broad spectrum [43] . This technology has been used in a variety of localization tasks requiring higher accuracy 20-30 cm than achievable through conventional wireless technologies, for example, radio frequency identification (RFID), WLAN, and so forth BIB001 . The limitation with this technique is that it requires specialized hardware and dedicated infrastructure, resulting in high costs for wide adoption BIB002 . 