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Non-cooperative location method for wireless network system on basis of signal arrival time

A wireless network system and time-of-arrival technology, applied in the field of target positioning, can solve problems such as degradation of positioning accuracy

Inactive Publication Date: 2014-08-06
NINGBO UNIV
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Problems solved by technology

However, this method ignores the second-order noise term, which may lead to a severe degradation of its localization accuracy at high noise levels and in the presence of outliers in the measurement.

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  • Non-cooperative location method for wireless network system on basis of signal arrival time
  • Non-cooperative location method for wireless network system on basis of signal arrival time
  • Non-cooperative location method for wireless network system on basis of signal arrival time

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Embodiment Construction

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0031] The present invention proposes a positioning method based on signal arrival time, figure 2 A schematic diagram of its overall flow is given, which mainly includes the following steps:

[0032] (1) First establish a plane or space coordinate system in the wireless network environment as the reference coordinate system. Suppose a target source, a transmitter and N receivers exist in the wireless network, and the coordinates of the transmitter in the reference coordinate system are marked for s 0 , the coordinates of the receiver in the reference coordinate system are marked as s 1 ,...,s N , the coordinates of the target source in the reference coordinate system are marked as x, the transmitter transmits a signal to the target source, and the signal is received by the receiver after being reflected by the target source, and the time t...

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Abstract

The invention discloses a non-cooperative location method for a wireless network system on the basis of signal arrival time. The method is characterized in that a weighting least square relational expression is constructed according to positions of an arranged transmitter and all receivers, measurement noise power of each base station and the time for transmitting signals from the emitter to each receiver, then a Lagrange function is constructed, a bisection method is utilized for obtaining the optimal Lagrange multiplier, and finally a final location value of the position of a target source is obtained by utilizing the optimal Lagrange multiplier. The method has the advantages of being capable of ensuring that the globally optimal solution is obtained without being influenced by local convergence, and the locating precision is high and steady; moreover, only a non-linear equation of one parameter needs to be solved, and therefore computation complexity of the method can be lowered.

Description

technical field [0001] The invention relates to a target positioning method, in particular to a non-cooperative positioning method based on signal arrival time. Background technique [0002] In the study of radar and sonar, target location is a classic research topic. In the past 30 years, especially after the September 11 incident, people have higher and higher requirements for location services, so that target location has received more and more attention. Target positioning technology has broad application prospects in military reconnaissance, traffic surveillance, industrial and agricultural control, biomedicine, environmental monitoring, emergency rescue and disaster relief, and remote control of dangerous areas. Therefore, it is of great significance to study positioning methods. [0003] In the traditional time-of-arrival-based cooperative localization problem, all sensors are transmitters or receivers, and the target must cooperate with the sensors to measure the ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/00
CPCG01S13/06
Inventor 何杉王刚金明李有明
Owner NINGBO UNIV
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