Wireless sensor positioning method based on round focal point
A technology of wireless sensing and positioning method, which is applied in the direction of location information-based services, wireless communication, electrical components, etc., and can solve the problem of high node hardware dependence
Inactive Publication Date: 2016-02-10
TIANJIN UNIVERSITY OF TECHNOLOGY
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The Range-Base algorithm has relatively high accuracy, but it is highly dependent on the hardware of the node and requires additional hardware assistance from the node
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[0064] The Dv-Hop algorithm is one of the more concerned non-ranging positioning algorithms at present. The estimated distance from the unknown node to each anchor node is calculated by the Dv-Hop algorithm. actual distance d i , the ranging error is
[0065] The specific positioning process of the present invention:
[0066] We take the positioning of an unknown node N(x,y) as an example, and find out the coordinates of the node to describe the positioning process of the design algorithm in detail. Deploy 3 anchor nodes in a 20×20 area, A(1.3,5)B(3.1,14)C(15,18.7), the node to be tested N, the real coordinates (10,10), the distance error is 0.2, The estimated distances from A, B, and C to the unknown node N(x,y) are 9.8, 7.8, and 9.8, respectively.
[0067] 1. Calculate the focus of all circles with the unknown node N(x,y) as the center and the estimated distance as the radius;
[0068] The coordinates of the 3 anchor nodes, where n=3; it is known that the measured and...
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The invention relates to a wireless sensor positioning method based on a round focal point. A positioning technology in a wireless sensor network is the main support technology for development of a wireless network technology; node positioning in the wireless sensor network can be divided into two processes: firstly, an unknown node calculates the distance or the angle between the unknown node and an anchor node by utilizing a distance measurement method; in the past, after obtaining the distance or the relative angle between the unknown node and the anchor node, the unknown node calculates the position itself through the schemes including a maximum likelihood method, a triangle measurement method and a trilateration; by means of the wireless sensor positioning method based on the round focal point provided by the invention, a focal point intensive set possibly contains a point to be detected can be known by calculating the focal point of a circle, which takes the anchor node as the circle centre and a corresponding estimation distance as the radius; the triangle positioning algorithm is replaced by an intensity algorithm for calculating the focal point of the circle, which takes the anchor node as the circle centre and the corresponding estimation distance as the radius; therefore, influence due to a loop can be avoided well; and the positioning precision is effectively increased.
Description
【Technical field】 [0001] The invention belongs to the technical field of combining computer application and wireless sensor network. 【Background technique】 [0002] Node positioning technology in Wireless Sensor Network (WSN) is one of the core technologies of wireless sensor network technology. In many applications, the accuracy of location information is the premise of the practicality of node data information. Under the premise of the cost limitation of network nodes, it is of great significance to improve the accuracy of wireless sensor node self-location. [0003] The positioning technology in the wireless sensor network generally has four characteristics: the first is low energy consumption and high efficiency: the energy consumption of the node is as low as possible during self-positioning, and the transmission and communication overhead is low, which is one of the basic hardware requirements for node construction , usually the computing power and storage space of th...
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Login to View More IPC IPC(8): H04W4/02H04W64/00
CPCH04W4/023H04W64/00
Inventor 张德干刘思李可赵德新明学超
Owner TIANJIN UNIVERSITY OF TECHNOLOGY