Method for locating WSN distributed node based on wave arrive direction estimation

A technology of direction-of-arrival estimation and distributed nodes, applied to beacon systems using radio waves, electrical components, network topology, etc., can solve the problems of limited communication radius of ordinary nodes, increased cost and complexity of network positioning, and achieve Avoiding additional overhead, reducing hardware costs, and the effect of location privacy protection

Active Publication Date: 2009-05-27
XIAN HUAXUN TIANJI COMM TECH CO LTD
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Problems solved by technology

Although this method does not require the nodes to have an array antenna system, since the AOA estimation of the anchor node can only serve one node, in order to realize the positioning service of the whole network, the anchor node needs to provide AOA estimation for each node successively.
Therefore, this method is not a

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  • Method for locating WSN distributed node based on wave arrive direction estimation
  • Method for locating WSN distributed node based on wave arrive direction estimation
  • Method for locating WSN distributed node based on wave arrive direction estimation

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Embodiment Construction

[0033] see figure 1 , a large number of target nodes are randomly distributed in the network area, and the mobile anchor nodes are loaded in the aircraft and can move autonomously over the network. The anchor node can obtain its own geographical location by relying on GPS. At the same time, in order to assist the DOA estimation of the target node, the anchor node is equipped with an array antenna system, while the target node only needs to be equipped with a conventional single antenna system. Due to the high-altitude overlooking state, the signal transmitted by the anchor node to the network is basically in the line-of-sight (LOS) environment, so it can be considered that the impact caused by multipath is very small.

[0034] see figure 2 , each array element of the anchor node transmits mutually orthogonal signals, which can be obtained based on time division, frequency division, code division, etc., so that the target node can distinguish the transmitted signals of each a...

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Abstract

The invention discloses a WSN distributed type node positioning method based on DOA estimation. First a wireless network structure is established comprising a mobile anchor node and several randomly distributed target node to be positioned; target node adopts single antenna system; mobile anchor node is loaded in mobile carrier and acquires self position via GPS; second, anchor node corrects its multi-channel antenna as inphase state; third, array antenna of anchor node emits multiple mutually orthogonal signals and every target node performs multiple 'pseudo-snapshots' for the orthogonal signals and estimates wave direction using the snapshot result; last, anchor node moves to multiple location for repeating the above procedure and every target node acquires wave direction information of several groups and finally estimation result of self position combining location of anchor node for emitting orthogonal signal and array antenna posture.

Description

technical field [0001] The invention relates to a wireless sensor network node positioning method, in particular to a wireless sensor network distributed node positioning method based on DOA (Direction of Arrival) estimation. Background technique [0002] In many applications of Wireless Sensor Networks (WSN), the location of nodes plays a crucial role. Sensing information is always accompanied by the geographical location of the collected information, and monitoring messages without location information are often meaningless. In addition, many routing protocols and network management algorithms also depend on the location of nodes. The use of GPS is a means of obtaining location information, but there are many defects in applying it to WSN. Due to the constraints of energy consumption, cost, application environment and other factors, it is not suitable for low-cost, self-organizing sensor networks. . With the deepening of WSN research, WSN node positioning technology eme...

Claims

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Application Information

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IPC IPC(8): H04W84/18H04W64/00G01S1/02
Inventor 王文杰殷勤业张渭乐韩玮
Owner XIAN HUAXUN TIANJI COMM TECH CO LTD
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