Ranging method, ranging device, location device and location method

• US 9,529,074 B2
• Filed: 10/10/2013
• Issued: 12/27/2016
• Est. Priority Date: 10/10/2013
• Status: Active Grant

• Current Assignee: DIZIC Co., Ltd.
• Original Assignee: DIZIC Co., Ltd.
• Inventors: Mastio, Daniel, Ianelli, Zbigniew
• Primary Examiner(s): Bythrow, Peter
• Assistant Examiner(s): SERAYDARYAN, HELENA H
• Application Number:
  US14/051,069
• Publication Number:
  US 20150102957A1
• Time in Patent Office: 1,174 Days
• Field of Search: 342/146
• US Class Current: 1/1
• CPC Class Codes: G01S 13/10 using transmission of interrupted, pulse modulated waves determination of distance by phase measurement G01S13/32
• CPC Class Codes: G01S 13/76 wherein pulse-type signals are transmitted
• CPC Class Codes: G01S 5/021 Calibration, monitoring or correction G01S5/0252 takes precedence
• CPC Class Codes: G01S 5/14 Determining absolute distances from a plurality of spaced points of known location
• CPC Class Codes: G01S 7/285 Receivers

Abstract

A ranging method, executed in a ranging device, comprising steps of: obtaining a trip time of a received wireless signal, wherein the received wireless signal is a wireless signal from an object; calculating a statistical value of a rising time of the received wireless signal; correcting the trip time according to the statistical value of the rising time; and estimating a distance between the object and the ranging device according to the corrected trip time.

Claims

1. A ranging device, comprising:

an antenna module, for receiving a wireless signal;

a medium access control module, connected to the antenna module;

a controller, connected to the medium access control module; and

a ranging module, connected between the medium access control module and the controller, for executing following steps;

obtaining a trip time of a received wireless signal, wherein the received wireless signal is a wireless signal from an object;

calculating a statistical value of a rising time of the received wireless signal;

determining whether the statistical value of the rising time of the received wireless signal is smaller than a specific value;

when the statistical value of the rising time of the received wireless signal is smaller than the specific value, estimating a distance between the object and the ranging device according to the trip time of the received wireless signal; and

when the statistical value of the rising time of the received wireless signal is not smaller than the specific value, estimating the distance between the object and the ranging device according to a corrected trip time, wherein the statistical value of the rising time of the received wireless signal corrects the trip time of the received wireless signal to generate the corrected trip time.

2. The ranging device according to claim 1, wherein while considering a noise is an additive white Gaussian noise, the statistical value of the rising time is a standard deviation of the rising time.

5. The ranging device according to claim 2, wherein the standard deviation of the rising time is calculated according to an effective bandwidth of the received wireless signal, energy of the received wireless signal, and a power spectral density of noise.

6. The ranging device according to claim 2, wherein the standard deviation of the rising time is calculated according to energy of the received wireless signal, a power spectral density of noise, a bandwidth of an intermediate frequency amplifier, and a duration of the received wireless signal.

7. The ranging device according to claim 1, wherein the wireless signal is a frequency band limited signal.

8. The ranging device according to claim 1, wherein the wireless signal is a complementary signal.

3. A location device, comprising:

an antenna module, for receiving a wireless signal;

a medium access control module, connected to the antenna module;

a controller, connected to the medium access control module; and

a location module, connected between the medium access control module and the controller, for executing following steps;

obtaining distances between the location device and objects; and

determining a location of the location device according to the distances;

wherein each distance between the location device and the object is obtained by following steps;

obtaining a trip time of a received wireless signal, wherein the received wireless signal is a wireless signal from an object;

calculating a statistical value of a rising time of the received wireless signal;

determining whether the statistical value of the rising time of the received wireless signal is smaller than a specific value;

when the statistical value of the rising time of the received wireless signal is smaller than the specific value, estimating a distance between the object and the location device according to the trip time of the received wireless signal; and

when the statistical value of the rising time of the received wireless signal is not smaller than the specific value, estimating the distance between the object and the location device according to a corrected trip time, wherein the statistical value of the rising time of the received wireless signal corrects the trip time of the received wireless signal to generate the corrected trip time.

4. The location device according to claim 3, wherein while considering a noise is an additive white Gaussian noise, the statistical value of the rising time is a standard deviation of the rising time.

9. The location device according to claim 4, wherein the standard deviation of the rising time is calculated according to an effective bandwidth of the received wireless signal, energy of the received wireless signal, and a power spectral density of noise.

10. The location device according to claim 4, wherein the standard deviation of the rising time is calculated according to energy of the received wireless signal, a power spectral density of noise, a bandwidth of an intermediate frequency amplifier, and a duration of the received wireless signal.

11. The location device according to claim 3, wherein the wireless signal is a frequency band limited signal.

12. The location device according to claim 3, wherein the wireless signal is a complementary signal.