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To enable accurate location of an acoustic source in a large field using the lowest possible number of sensors (sensor nodes), we propose the use of a 10-element microphone array with the time delay of arrival (TDOA) method. The 10-element microphone array consists of a small five-element spatial sub-array and an external five-element planar sub-array. The former sub-array is used to calculate the...
With the rapid development of wireless sensor network, the networks become more complex. Original synchronicity algorithms may not work efficiently for complex mesh network. In this paper, we present a new firefly-inspired stochastic coupled synchronicity strategy with simplified discrete phase model in wireless sensor network. It is a software-based strategy, which can more fully utilize the communication...
Time synchronization is a crucial component of WSN. As the rapid development of mesh network, firefly-inspired synchronization algorithm comes out for solving the synchronization issue of large-scale networks. But it usually has a short cycle for improving the sync rate. In this paper, a multiscale cycle synchronization strategy is proposed based on firefly-inspired algorithm for long cycle. First,...
It is common that the deformation of an excavation slope leads to the displacement or even destruction of the surrounding buildings. An effective way to put an end to such accidents is to have adequate knowledge on the trigger factors of the deformation and failure of excavation slopes. Herein, taking the foundation pit slope at the Cultural Square in Badong County, China as an example, we carried...
In test-range tracking, traditional machine vision systems are composed of a frame grabber and a host PC, which cannot meet the requirement of real-time processing. In this paper, we present a real-time locating system based on FPGA (Field Programmable Gate Array) to solve problems caused by high-speed and low-sharpness of the target in field testing. FPGA, as the system processing core, captures...
In this paper, the method of two TDI (Time Delay Integration) CCD intersection is proposed to achieve the location of light target in a large field. Frame difference method combined with OTSU threshold segmentation algorithm is proposed to identify the image with light target. Besides, in order to reduce the storage capacity, we carry out binarization processing on target image. For getting the position...
Attitude control is crucial for small-scale unmanned helicopter autonomous flight, and attitude model is the basis for attitude control. This paper presents an attitude modeling method for small-scale unmanned helicopter. First-principle approach is applied to analyze and construct the structural attitude model with consideration of the coupling effects between different channels. The PEM parameter...
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