No-key entry and no-key start system positioning method

A technology of keyless start and keyless entry, which is applied in the fields of radio wave measurement system, wireless communication, transportation and packaging, etc. It can solve the problems that the ranging results are greatly affected, and the characteristics of RSS signal changes are not fully considered.

Active Publication Date: 2018-12-11
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0004] The existing technology does not fully consider the variation characteristics of RSS signals b

Method used

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  • No-key entry and no-key start system positioning method
  • No-key entry and no-key start system positioning method
  • No-key entry and no-key start system positioning method

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Embodiment Construction

[0086] The following describes several preferred embodiments of the present invention with reference to the accompanying drawings, so as to make the technical content clearer and easier to understand. The present invention can be embodied in many different forms of embodiments, and the protection scope of the present invention is not limited to the embodiments mentioned herein.

[0087] In the drawings, components with the same structure are denoted by the same numerals, and components with similar structures or functions are denoted by similar numerals. The size and thickness of each component shown in the drawings are shown arbitrarily, and the present invention does not limit the size and thickness of each component. In order to make the illustration clearer, the thickness of parts is appropriately exaggerated in some places in the drawings.

[0088] Such as figure 1 As shown, this embodiment provides a positioning method for a keyless entry and keyless start system based...

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Abstract

The invention discloses a no-key entry and no-key system positioning method, and relates to the technical field of wireless communication and positioning. The method comprises the following main steps: 1, extending the Kalman algorithm distance estimation, and achieving the tracking and positioning of a smart key through extending the Kalman algorithm according to an RSS signal; 2, performing theadaptive updating of the RSS signal distance model parameters, and performing the real-time correction of the RSS signal distance model parameters based on a distance measurement value of the smart key at step 1; 3, performing the positioning based on an improved logistic regression location fingerprint algorithm. The method solves a key problem of the positioning of the smart key of the no-key entry and no-key system based on the extended Kalman filter algorithm and the improved internal and external identification algorithm based on improved logistic regression, and can effectively improve the positioning accuracy and positioning range of the smart key based on low power Bluetooth RSS signal, and improves the robustness of the no-key entry and no-key start system.

Description

technical field [0001] The invention relates to the technical field of wireless communication and positioning, in particular to a positioning method for a keyless entry and keyless start system. Background technique [0002] The smart phone-based keyless entry and start system (Passive Entry & Passive Start, PEPS) is an important development direction of the next generation of automotive PEPS. This technology is a positioning technology based on smart phones and low-power Bluetooth, which aims to replace the existing high-low frequency PEPS system technical solutions. Bluetooth PEPS technology can use the user's smartphone to achieve keyless entry and start, thereby eliminating the need for a special key for the car. There are still many problems to be studied in the keyless entry and start based on Bluetooth low energy, such as the precise identification of the interior and exterior of the car, the distance estimation between the car and the smart key, and so on. [0003]...

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Application Information

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IPC IPC(8): G01S11/06H04W64/00H04W4/40H04W4/80
CPCH04W4/40H04W4/80H04W64/00G01S11/06Y02D30/70
Inventor 赵忠华曹一文鲁兴龙晏懿琳吉小军杨剑庞晓峰李达
Owner SHANGHAI JIAO TONG UNIV
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