Keyless system positioning method based on Bluetooth RSSI

A positioning method and keyless technology, applied in the field of wireless communication and intelligent control, can solve problems such as less than ideal accuracy, and achieve the effect of improving positioning accuracy

Active Publication Date: 2017-09-01
DONGHUA UNIV
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AI Technical Summary

Problems solved by technology

[0004] However, the positioning accuracy of the existing keyless system is not ideal, how to improve the positio

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  • Keyless system positioning method based on Bluetooth RSSI
  • Keyless system positioning method based on Bluetooth RSSI
  • Keyless system positioning method based on Bluetooth RSSI

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[0056] The present invention will be further explained below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

[0057] Combine figure 1 This embodiment provides a Bluetooth RSSI-based keyless system positioning method. First, the attenuation model of the radio frequency signal inside and outside the car is studied, and the BP neural network is used to fit the signal strength RSSI-d nonlinear function inside the car for ranging , And then use the second weighted centroid segmentation algorithm based on the car environment to locate the smart car key....

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Abstract

The invention provides a keyless system positioning method based on a Bluetooth RSSI. The keyless system positioning method is characterized by comprising the following steps: firstly, initially judging whether a key is in or outside a car; establishing a car interior and exterior space coordinate system, setting up four base stations, separately installing the four base stations in the centers of four sides of the car, and when an intelligent key of the car receives signal strengths sent by the four base stations, sequentially comparing each strength to judge which quadrant the key is located; calculating the distances from the key to the four base stations according to the signal strengths and an in-car attenuation model, and further judging whether the key is in or outside the car; obtaining the corrected distances from the key to the four base stations by using an in-car attenuation neural network model or a free space attenuation model according to whether the key is in or outside the car; and then positioning the location of the key by using a twice-weighted centroid sectional positioning algorithm. By adopting the method provided by the invention, the positioning accuracy of the intelligent car key can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of wireless communication and intelligent control, in particular to a Bluetooth RSSI-based positioning method for a keyless system. Background technique [0002] The smart key is the core electronic device of the keyless system, and is favored by the majority of automobile manufacturers due to its humanized design and high security. At present, various products of keyless entry systems have appeared one after another at home and abroad, but because the keyless system is still a relatively advanced technology, the core technology is only controlled by a few manufacturers, so it is mainly used in high-end cars now. [0003] One of the key technologies of the keyless system is the area detection technology, which is used to locate the key position and determine whether it is within the set working range. The accuracy of area detection is an important parameter to measure the quality of a keyless system. Using ...

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Application Information

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IPC IPC(8): H04W4/02H04W64/00G01S5/14
CPCG01S5/14H04W4/023H04W64/003
Inventor 王谦单志勇卢勇杰王亚飞
Owner DONGHUA UNIV
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