A positioning method for estimating departure angle by using wifi field strength
A technology of angle estimation and positioning method, applied in wireless communication services, electrical components, wireless communication and other directions, can solve the problem of low accuracy of distance positioning algorithm, achieve good scalability and practicability, reduce positioning error, and high positioning accuracy Effect
Active Publication Date: 2017-12-08
XI AN JIAOTONG UNIV
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Its core is that, according to the characteristics of field strength distribution, a simple algorithm is used to estimate the departure angle and then realize the node position estimation, which solves the problem of low accuracy based on the distance positioning algorithm, and avoids the establishment of the database and the use of spatial WIFI fingerprint technology. The update process, and this distributed position estimation has nothing to do with the density of nodes in the network, and the positioning network has good scalability
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[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0022] A positioning method utilizing WIFI field strength to estimate departure angle, comprising the following steps:
[0023] (1) The sending node sends a signal: according to figure 1 As shown in the positioning principle diagram, the network includes two sending nodes a and b, and the position coordinates are (x 1 ,y 1 ,z 1 ) and (x 2 ,y 2 ,z 2 ), and each sending node is equipped with nine directional antennas, which are responsible for sending 802.11 protocol radio frequency Beacon signals with different SSIDs on nine beams. The structure of the directional antennas is exactly the same, and the placement method is: make the main beam direction of one of the directional antennas vertically downward, and the other eight directional antennas are placed at an angle of 45° between the horizontal directions ( figure 2 ) obliqu...
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The invention discloses a positioning method for estimating the departure angle by using WIFI field strength, including: (1) the sending node uses a constant sending power to send several directional broadcast signals in time division and performs rotation switching, and the sending nodes on different beams The signal is distinguished by the network identifier SSID; (2) The node to be tested detects the broadcast signal sent in each direction, and records the field strength information separately, and estimates the departure angle of itself relative to the sending node through the distribution of the field strength (including azimuth θ and pitch angle); (3) In the context of practical applications, the node to be measured combines the position of the sending node with the estimated departure angle of itself relative to the sending node to perform position estimation. The present invention finally realizes the position estimation of the node according to the departure angle estimation, and has the advantages of high precision, simple equipment and low computational complexity.
Description
technical field [0001] The invention relates to a WIFI positioning method, in particular to a relatively high-precision positioning for angle estimation using WIFI field strength characteristics. Background technique [0002] WIFI is a wireless data communication method that can connect terminals such as personal computers and handheld devices (such as PADs and mobile phones) to each other in a wireless manner, and has been widely used at present. The location information of wireless nodes in wireless networks is very important. GPS and TDOA positioning systems in mobile communications need to be equipped with special receivers (GPS receivers or ultrasonic signal receivers) on the nodes to be tested, which will be limited by cost and power consumption , and the GPS receiver cannot work indoors. The existing wireless network positioning methods can be roughly divided into distance-independent positioning algorithms and distance-based positioning algorithms. Distance-indepen...
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IPC IPC(8): H04W4/04H04W64/00
Inventor 王文杰王波张渭乐李骛董建云
Owner XI AN JIAOTONG UNIV