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Mobile terminal high-precision distance and speed estimation method and system based on sound

A mobile terminal and speed estimation technology, applied in the direction of location information-based services, specific environment-based services, radio wave measurement systems, etc., can solve low-complexity and high-computational-complexity problems

Pending Publication Date: 2021-08-31
CHANGAN UNIV
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Problems solved by technology

Traditional signal parameter estimation methods often have high computational complexity, and low-complexity, high-precision distance and velocity estimation problems need to be solved urgently

Method used

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  • Mobile terminal high-precision distance and speed estimation method and system based on sound
  • Mobile terminal high-precision distance and speed estimation method and system based on sound
  • Mobile terminal high-precision distance and speed estimation method and system based on sound

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Embodiment Construction

[0040] In order to more clearly illustrate the purpose, technical solutions and advantages of the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of them. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0041] According to the theory of geometric acoustics, there are multipath fading sound channels between the receivers R of the sound source B, and the number of multipaths is L. In general, its impulse response (CIR, Channel Impulse Response) can be expressed as:

[0042]

[0043] where a i (t), τ i (t) and are the channel gain, channel delay and Doppler shift, respectively.

[0044] In ...

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Abstract

The invention provides a mobile terminal high-precision distance and speed estimation method and system based on sound. The method comprises the following steps of: acquiring a composite hyperbolic frequency modulation signal; performing time delay estimation on hyperbolic frequency-modulated signals of two different frequency bands of the composite hyperbolic frequency-modulated signal at the same time to respectively obtain time delay estimation values of the hyperbolic frequency-modulated signals of the two different frequency bands, resolving to obtain a Doppler factor and a time delay estimation value of the composite hyperbolic frequency-modulated signal, and calculating a distance estimation value and a speed estimation value according to the Doppler factor and the time delay estimation value of the composite hyperbolic frequency modulation signal. The prior information of a sound source signal is used as a reference signal, and the distance and speed information can be obtained at the same time only through two times of generalized cross-correlation or two matched filters, so that spectrum leakage is effectively inhibited, sound pollution is avoided, the signal-to-noise ratio of the signal is effectively ensured, the estimation accuracy and calculation complexity can meet the indoor positioning system requirements for the intelligent mobile terminal, and the mobile terminal high-precision distance and speed estimation method and system have good application and popularization values.

Description

technical field [0001] The invention belongs to the field of indoor positioning, and in particular relates to a sound-based high-precision distance and speed estimation method and system for a mobile terminal. Background technique [0002] With the popularization of smart phones, smart bracelets, smart speakers and household cleaning robots, the demand for positioning and navigation of smart mobile terminals in indoor space is getting stronger and stronger. The high-precision indoor positioning service for intelligent mobile terminals has broad market application prospects. Acoustic technology has the advantages of high positioning accuracy, low cost, good compatibility, strong versatility and universality, etc., and is the most potential solution for indoor positioning and navigation of intelligent mobile terminals. In the past few years, domestic and foreign scholars have developed many prototype systems based on acoustic technology, and distance-based localization method...

Claims

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Application Information

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IPC IPC(8): H04W4/33H04W4/021H04W64/00H04W56/00G01S11/14
CPCH04W4/33H04W4/021H04W64/006H04W56/001G01S11/14
Inventor 张磊区汉东王宁谢曙钊焦侃胡志新
Owner CHANGAN UNIV
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