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In this paper, a positioning technique based on Time Difference of Arrival (TDoA) measurements is analyzed. The proposed approach is designed to consent range and position estimation, using ultrasound transmissions of a stream of chirp pulses, received by a set of wireless nodes. A potential source of inaccuracy introduced by lack of synchronization between transmitting node and receiving nodes is...
Ultrasound represents a very compact, low cost method that is non-invasive and does not involve ionizing radiation. A new A-mode ultrasound pulser-receiver system, which digital control module is based on FPGA chip, has been designed and implemented. The pulser-receiver system consists of three parts: digital signal processing module, high frequency pulser and receiver module. The pulser was programmed...
The pinus is a type of wood that is widely used as feedstock for the production of softwood pulp and higher quality paper, boards, MDF (Medium Density Fiberboard), OSB (Oriented Standard Board), plywood, furniture and others. The main problem for the pinus is the attack by the wood wasps (Sirex noctilio F., 1793) (Hymenoptera; Siricidae) that damages the wood due to galleries built by the wasps larvae...
In this paper, we developed new real time human respiration analysis method with our proposed high time sampling gas concentration meter using ultrasound. Our proposed gas concentration sensor use 400 kHz ultrasound and realize 1 kHz gas concentration sampling speed for ppm level gas changes. This device reveals human specific about 50–200 millisecond H2O-CO2 gas concentration exchange and this result...
This paper proposes an innovative ultrasonic time of flight (TOF) measurement method with narrow-band transducers. By introducing the received ultrasonic wave peak time sequences (PTSs) of two slightly different frequencies, the relative TOF can be accurately identified with a much better resolution than a wave period. The new PTS TOF measurement is achieved in two steps. First, a PTS is built for...
Having access to accurate position information is a key requirement for many wireless sensor network applications. We present the design, implementation and evaluation of SpiderBat, an ultrasound-based ranging platform designed to augment existing sensor nodes with distance and angle information. SpiderBat features independently controllable ultrasound transmitters and receivers, in all directions...
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