Distance measuring device and distance measuring method
A distance measurement and distance technology, applied in the field of distance measurement devices, can solve the problem that radio waves are not easy to reach indoors
Pending Publication Date: 2022-03-29
SONY SEMICON SOLUTIONS CORP
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Problems solved by technology
[0002] There is a problem that it is difficult to use GPS (Global Positioning System) for indoor positioning or distance measurement because radio waves from GPS satellites do not easily reach indoors
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no. 1 example
[0046] 2. The first embodiment of the present technology (distance measuring device)
[0047] 3. The second embodiment of the present technology (distance measuring method)
[0048]
[0049] Various distance measurement techniques are currently being investigated. Examples thereof include pedestrian dead reckoning (PDR) which measures the amount of movement of the user, a positioning method which performs matching to geomagnetic data, etc., and a time-of-flight (TOF) method which measures distance based on time-of-flight of light.
[0050] However, there is a problem with pedestrian dead reckoning that errors acquired from accelerometer sensors, gyro sensors, etc. accumulate and there is no way to correct for these errors. A positioning method that performs matching for geomagnetic data or the like has a problem in operation that a map needs to be created in advance and matching data needs to be recreated when the map, layout, etc. are changed. A problem with the TOF metho...
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Provided are a distance measurement device and a distance measurement method which are capable of accurately measuring a distance even when multipath occurs. The invention provides a distance measuring device. The distance measuring device comprises a first transceiving unit, a second transceiving unit, a response information acquisition unit, a filter unit and a distance calculation unit, the first transmit-receive unit transmits a first pulse signal to the second transmit-receive unit while performing frequency scanning. The second transceiver unit receives the first pulse signal transmitted from the first transceiver unit. The response information acquisition unit acquires response information based on a phase difference obtained by receiving the first pulse signal. The filter unit extracts initial response information, which is response information of an initial reception portion of the first pulse signal, from the response information. The distance calculation unit calculates a group delay based on the initial response information, and calculates a distance between the first transceiver unit and the second transceiver unit by multiplying the group delay by the light velocity.
Description
technical field [0001] The technology relates to a distance measuring device and a distance measuring method. Background technique [0002] There is a problem that it is difficult to use GPS (Global Positioning System) for indoor positioning or distance measurement because radio waves from GPS satellites do not easily reach indoors. Therefore, distance measurement techniques using wireless signals, such as Wi-Fi, Bluetooth (registered trademark), and the like, have recently been used. [0003] The use of distance measurement technology can enable indoor navigation, analyze the route of customers walking in the store, and so on. [0004] Patent Document 1 discloses "a distance measuring device that calculates a distance based on carrier phase detection, the distance measuring device includes: a calculation section for calculating the first device based on the phase information obtained by the first device and the second device and the distance between the second device, at ...
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IPC IPC(8): G01S11/02G01S13/76
CPCG01S13/76G01S11/02G01S7/006G01S7/282G01S13/282
Inventor 田中正幸中野裕章大前宇一郎
Owner SONY SEMICON SOLUTIONS CORP