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Seamless positioning is now the key technology to meet the increasing requirements of Location Based Service (LBS). The handoff algorithm plays an important role in the seamless positioning. Current handoff algorithms are mainly based on the Received Signal Strength (RSS), and it is not reliable in complex scenarios. This paper presents a Euclidean distance(More)
The demand for LBS is increasing continuously, which makes ubiquitous LBS the future trend for the development of position technology. To realize ubiquitous LBS, multiple existing radio localization technologies should be combined for the purpose of better performance. Meanwhile, veritable ubiquitous LBS is hard to achieve without seamless positioning(More)
Fingerprint positioning is considered to be one of the most promising indoor positioning technique. The most significant technological bottleneck of fingerprint positioning technology is the high labor cost of the radio map establishing process. Many radio map fast establishing algorithms were proposed to solve this problem. There is no evaluation norm for(More)
In this paper a GPS signal acquisition circuit is designed based on FPGA and a new GPS signal frequency domain search strategy is proposed and implemented by combining the cyclic shift sweep and DDS sweep. The system frequency domain search speed is improved evidently. And TTFF (time to first fix) can be extremely reduced, with out to much extra hardware(More)
Fingerprint localization algorithm is widely used in indoor scenario positioning. Received Signal Strength (RSS) is commonly used as the signal feature of fingerprint algorithm. But RSS could be changed due to the temperature or environment reason, which makes it an unreliable signal feature. This paper proposes a novel positioning algorithm based on the(More)
The cognitive sensor (CS) can transmit data to the control center in the same spectrum that is licensed to the primary user (PU) when the absence of the PU is detected by spectrum sensing. However, the battery energy of the CS is limited due to its small size, deployment in atrocious environments and long-term working. In this paper, an(More)
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