Passive localization method based on multi-channel energy measurement in wireless sensor network
A wireless sensor and energy measurement technology, applied in the field of wireless networks, can solve the problems of passive positioning methods without multi-channel noise problems, and achieve the effects of reducing channel switching delay, improving real-time performance, and alleviating negative effects
Active Publication Date: 2019-10-11
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology
[0004] At present, there is no passive positioning method to deal with the problem of multi-channel noise
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[0053] The present invention will be further described below in conjunction with the accompanying drawings.
[0054] A passive positioning method based on multi-channel energy measurement in wireless sensor networks can be divided into four stages: data collection, online monitoring, path estimation, and target positioning.
[0055] 1. Data Collection
[0056] (1.1) Arrange the wireless sensor on a support 1 meter above the ground, and arrange it around the monitoring area. Figure 4 shown. The number of sensor nodes depends on the size of the area to be measured, but it should be ensured that each node can receive wireless signals from other nodes. The sensor node used in the present invention is a TelosB node, which can work in the 2.4GHz ISM frequency band and follows the IEEE 802.15.4 protocol standard. The TelosB node has 16 channels in the 2.4G frequency band (channels 11 to 26). When the node is started, it runs on channel 11. The channel switching sequence is 11-12-...
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The invention discloses a passive location method based on multi-channel energy measurement of a wireless sensor network. The method comprises the steps that 1, a sink sends instructions to start a system; 2, sensor nodes successively send data packets after receiving the instructions, and after the final node finishes sending data, all nodes are switched to next channels for repeating the data sending and collecting processes; 3, the sink monitors wireless signal transmission constantly and sends the data to a computer in real time; 4, the computer stores the collected data in an unmanned state as a comparison sample, and the system starts monitoring an appointed region; 5, the computer continuously receives the received signal strength data of the links in different channels and speculates propagation paths possibly influenced by targets according to a signal multi-path propagation formula for the data in a time window; and 6, the computer takes speculation results of multiple links into comprehensive consideration and calculates positions of people.
Description
technical field [0001] The invention belongs to the technical field of wireless networks, relates to a passive positioning method for a wireless sensor network, belongs to a positioning method for determining a target position by using a target to affect wireless signal transmission, and specifically relates to a passive positioning method based on multi-channel energy measurement of a wireless sensor network. positioning method. Background technique [0002] There are two types of methods for locating targets using wireless sensor networks. One type requires the target to carry special wireless devices, such as wireless sensors and radio frequency identification tags (RFID), which are called active positioning methods, and the other type does not require the target to carry any special devices, known as passive location methods. The target of passive positioning is people. The basic principle is that people affect the propagation of wireless signals. Through real-time moni...
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IPC IPC(8): H04W64/00H04W84/18
Inventor 朱小军吴盼陈兵
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS