Method and system for locating mobile device relative to vehicle
A technology for positioning mobile devices and vehicles, applied to systems that determine direction or offset, services based on location information, services based on specific environments, etc., and can solve problems such as damage and uncertainty
Active Publication Date: 2020-04-10
GM GLOBAL TECH OPERATIONS LLC
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- Application Information
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However, low frequency waves are generally audible to humans and are therefore destructive
High frequency waves, on the other hand, are generally inaudible to humans, but introduce a certain amount of uncertainty in terms of the location of the mobile device, especially if the associated speakers / microphones are not spaced closely enough
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[0014] The systems and methods described herein provide for positioning a mobile device relative to a vehicle using mechanical wave and modulation techniques. In one example, a high frequency carrier, normally inaudible to humans, is modulated with a low frequency baseband signal that provides precise positioning to generate a modulated signal. In contrast to electromagnetic (EM) waves, the modulated signals are mechanical or pressure waves, which are generated or emitted by one or more speakers and received by one or more microphones. For example, by transmitting a modulated signal from a speaker on the mobile device to a plurality of microphones mounted on the vehicle and specially spaced apart, the method and system can establish a plurality of positioning paths that can then be used to determine the position of the mobile device relative to the vehicle. Location. As used herein, the term "localization path" refers to the path propagating from a loudspeaker to a ...
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A system and method for locating a mobile device relative to a vehicle using mechanical waves and modulation techniques. A high frequency carrier wave that is generally inaudible to humans is modulated with a low frequency baseband signal that provides for accurate localization in order to generate a modulated signal. The modulated signal is a mechanical or pressure wave, as opposed to an electromagnetic (EM) wave, that is transmitted by one or more speaker(s) and is received by one or more microphone(s). In one example, the modulated signal is transmitted from a speaker on the mobile device (e.g., a smart phone) to a number of microphones mounted on the vehicle at specific distances apart, so as to establish multiple localization paths whose differences in phase can be used to determine the location of the mobile device, relative to the vehicle.
Description
technical field [0001] The present invention generally relates to positioning a mobile device relative to a vehicle, such as when a user carrying the mobile device approaches the vehicle in a parking lot or parking structure with multiple other vehicles. Background technique [0002] For many existing vehicles, the user can control certain vehicle functions using a mobile device such as a smartphone or key fob. For example, users are known to use an app on a smartphone or key fob to unlock the doors or remotely start the vehicle. [0003] For some applications, such as applications in which the vehicle uses a direction-of-arrival (DOA) approaching the user to activate some vehicle functions, it may be necessary to determine the location of the mobile device relative to the vehicle. This is sometimes called "positioning". To accurately determine the location of an approaching mobile device, low frequency waves can be used. However, low frequency waves are generally audible...
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IPC IPC(8): G01S5/26
CPCG01S5/26H04W4/40H04W12/06H04W4/023G07C9/00174G01S1/753G01S3/808G01S5/24G07C2009/00801G07C2209/63G01S5/0027G01S5/0054
Inventor E·蒂泽凯尔-汉考克N·沙巴泰N·拉维
Owner GM GLOBAL TECH OPERATIONS LLC