A positioning method based on distance estimation in wireless sensor network
A technology of wireless sensor network and positioning method, which is applied in the field of positioning based on distance estimation in wireless sensor network, and can solve the problems of reduced positioning accuracy, large distance estimation, error, etc.
Active Publication Date: 2016-03-16
重庆锐虎光电科技有限公司
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Problems solved by technology
When the unknown nodes are unevenly distributed due to factors such as terrain, environment, and climate, it will lead to a large distance estimation error, which will reduce the positioning accuracy; secondly, there is a certain error in the average distance per hop, when the unknown node to the anchor point When the number of hops is large, the cumulative effect of errors will greatly reduce the positioning accuracy
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[0056] The positioning method based on distance estimation in wireless sensor networks has the following steps (see figure 1 with figure 2 ):
[0057] 1) The anchor points and unknown nodes with autonomous positioning capabilities are randomly distributed in the positioning area, and the unknown nodes are sensor nodes that determine their positions by obtaining relevant information of the anchor points;
[0058] 2) Self-initialization of anchor points and unknown nodes;
[0059] 3) Each anchor point sends a data packet containing its own ID and its own coordinates to the surrounding unknown nodes, and sets the data recorded in the data packet to 0;
[0060] 4) The unknown node receives the data packet of each anchor point described in step 3), extracts the ID information in the data packet for judgment, if it is the first time to receive the data packet of the ID, record the data packet, and send the data packet Add 1 to the hop value and forward it to the surrounding unkn...
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The invention relates to a positioning method based on distance estimation in a wireless sensor network. According to the method, an optimal distance estimation anchor point is searched for according to the distance to be estimated by means of an unknown node each time when distance estimation is carried out, three types of distance estimation methods are available according to whether the optimal distance estimation anchor point exists and the type of the optimal distance estimation anchor point, each type of distance estimation method acquires the estimated distance in different ways to achieve positioning, and finally the weighted approach is carried out on multiple estimation coordinates of the same unknown node by means of a 'non-linear - hop' weighting factor to obtain the coordinates of the unknown node to achieve positioning. The positioning method based on distance estimation in the wireless sensor network is small in distance estimation error and high in positioning accuracy.
Description
technical field [0001] The invention relates to a positioning method in a wireless sensor network, in particular to a positioning method based on distance estimation in a wireless sensor network. Background technique [0002] In recent years, with the continuous increase of people's demand for unattended environmental monitoring, object tracking, and indoor navigation, the role of wireless sensor networks has become more and more obvious. [0003] Sensor nodes, data processing terminals, and gateway nodes are the basis of forming a wireless sensor network. Its networking method adopts multi-hop and peer-to-peer methods. The network topology is similar to that of a wireless Adhoc network, with dynamic changes such as self-organization and self-adaptation. characteristic. [0004] The sensor nodes are scattered in the designated sensing area, and they can read the data from the surrounding environment, but because these sensor nodes are small in size and have limited computin...
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IPC IPC(8): H04W64/00H04W84/18
Inventor 黄智勇张欣李新科胡国庆
Owner 重庆锐虎光电科技有限公司