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A joint centroid localization method based on error correction for wireless sensor network node localization
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A wireless sensor and network node technology, which is applied in the direction of location information-based services, positioning, and radio wave measurement systems, can solve the problems of high power consumption of nodes, high computational complexity, and small positioning range, so as to improve positioning accuracy Effect
Active Publication Date: 2016-03-23
严格集团股份有限公司
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[0007] The purpose of the present invention is to propose a joint centroid positioning method based on error correction suitable for wireless sensor network node positioning, so as to solve the problem of low accuracy of position coordinate information obtained by the existing distributed sensor positioning method, large amount of calculation, and large number of nodes. Large power consumption, high computational complexity, small positioning range, poor positioning accuracy of unknown nodes in areas with few anchor nodes (sensor nodes with known positions), and even some edge nodes cannot be located
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specific Embodiment approach 1
[0061] Specific Embodiment 1: An error-correction-based joint centroid positioning method suitable for wireless sensor network node positioning described in this embodiment is implemented according to the following steps:
[0062] Step 1. Use the error probability distribution to realize high-precision positioning of some unknown nodes. The specific process is:
[0063] Step 1 (1): Calculate the distance between the unknown node and □ anchor nodes by receiving signal strength, where n represents the number of anchor nodes within the communication radius of the unknown node;
[0064] Step 1 (2): Solve the coordinates of the unknown nodes and derive the error function;
[0065] Step 1 (3): Obtain the error probability density function through measurement;
[0066] Step 1 (4): Use the function obtained in Step 1 (3) to calculate the joint probability distribution:
[0067] The distance from each anchor node to the unknown node is measured independently, and the joint probabilit...
specific Embodiment approach 2
[0094] Specific implementation mode 2: The difference between this implementation mode and specific implementation mode 1 is that the process of solving the coordinates of unknown nodes described in step 1 (2) is:
[0095] The distance between any two anchor nodes within the communication radius of the unknown node is calculated as follows:
[0096] m i = ( x i - x ) 2 + ( y i - ...
specific Embodiment approach 3
[0104] Specific implementation mode three: this implementation mode is different from specific implementation mode one or two in that: the process of deriving the error function described in step one (two) is:
[0105] Since the error is very small relative to the distance, the error of the square term of the error is smaller and can be ignored. From (18) and (19) formulas can be obtained
[0106] x = 1 4 [ ( d i 2 + 2 d i λ i + λ ...
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Abstract
The invention belongs to the technical field of wireless sensor positioning, and discloses a joint centroid positioning method suitable for wireless sensor network node positioning based on error correction to solve the problems that according to an existing distribution type sensor positioning method, the precision of the obtained position coordinate information is not high, the calculation quantity is large, the power consumption of nodes is large, calculation complexity is high, the positioning range is small, the positioning precision of unknown nodes in the area where the number of anchor nodes is small is poor, and even some edge nodes cannot be positioned. The method comprises the steps that part of the unknown nodes in the anchor nodes are positioned through the existing anchor nodes in the wireless sensor network, secondary positioning is carried out according to the centroid positioning algorithm, position information is corrected through the error probability distribution, and high-precision positioning of the unknown nodes in an anchor node poor area is achieved. The joint centroid positioning method is suitable for underwater sensor positioning and specific application scenes such as forest fireproofing.
Description
technical field [0001] The invention relates to a positioning method for a wireless sensor network node, belonging to the technical field of wireless sensor positioning. Background technique [0002] The localization problem in wireless sensor networks is a very active research field. At present, there have been many reviews and papers published in this direction at home and abroad. The authors of these documents discuss the localization methods in wireless sensor networks in various situations, analyze and evaluate the advantages and disadvantages of these methods and the applicable conditions. [0003] In many applications, one of the most important uses of wireless sensor networks is to obtain event location information, such as underwater sensor positioning, forest fire prevention and other specific application scenarios, because it is necessary to know more accurate location information for these events, otherwise The parameters obtained by the sensor are meaningless. ...
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