User-executable antenna array calibration

• US 8,264,408 B2
• Filed: 11/20/2007
• Issued: 09/11/2012
• Est. Priority Date: 11/20/2007
• Status: Active Grant

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Corporation
• Inventors: Kainulainen, Antti Paavo Tapani, Richter, Andreas, Belloni, Fabio
• Primary Examiner(s): LIU, HARRY K
• Application Number:
  US12/743,594
• Publication Number:
  US 20100277363A1
• Time in Patent Office: 1,757 Days
• Field of Search: 342/417
• US Class Current: 342/417
• CPC Class Codes: G01S 3/023 Monitoring or calibrating

Abstract

A system used for calibrating a direction-finding system. A device may include a signal receiver array. The signal receiver array may be utilized to determine the direction of arrival for signals emitted by other devices, and therefore, may be used to resolve the direction towards another device using the received signal. For example, an external tag may be utilized to emit a wireless signal usable inducing a response in each signal receiver of the signal receiver array. The device may also include one or more sensors usable in determining device orientation and/or a change in device orientation. The combined signal receiver response information and orientation information may be recorded at various instants as the device is moved for use in calibrating the antenna array.

Claims

1. A method, comprising:

activating a calibration operation in a device;

identifying calibration signal sources based on signals received in the device;

displaying an identification on the device for each of the calibration signal sources, the identification being derived from the received signals;

if more than one calibration signal source was identified, selecting a calibration signal source from the calibration signal sources displayed on the device;

displaying instructions on the device for orienting the device relative to the calibration signal source;

receiving a signal from the calibration signal source into the device via a signal receiver array coupled to a direction-finding system in the device;

measuring a signal response induced by the signal in each signal receiver of the signal receiver array;

determining, based on the signal response, if the received wireless signal quality is sufficient for use in calibration;

if the quality of the received signal is sufficient for use in calibration, determining orientation information for the device when the signal response is measured;

storing the signal response and the orientation information at various instances while moving the device in accordance with instructions displayed on the device; and

calibrating the direction-finding system in the device based on the stored signal response and the orientation information.

2. The method of claim 1, wherein the signal comprises packets, the device identifying the calibration signal sources based on packet address information.

3. The method of claim 1, wherein the signal quality is determined based on at least one of signal to noise ratio or signal power level.

4. The method of claim 1, wherein the orientation information includes at least a rotational angle provided by a sensor in the device, the sensor being at least one of an acceleration sensor configured to measure rotational acceleration or a compass.

5. The method of claim 1, wherein moving the device comprises at least one of rotating the wireless communication device around a center point in the device or a user holding the wireless communication device while rotating their body in a circle.

6. The method of claim 5, wherein the device takes into account interference caused by the user when holding the device.

7. The method of claim 1, wherein the stored signal response and the orientation information are used to create a matrix of calibration values in the device.

8. A computer program product comprising computer executable program code recorded on a computer readable non-transitory storage medium, the computer executable program code comprising:

code configured to activate a calibration operation in a device;

code configured to cause the device to identify calibration signal sources based on signals received in the device;

code configured to cause the device to display an identification on the device for each of the calibration signal sources, the identification being derived from the received signals;

code configured to, if more than one calibration signal source was identified, cause the device to receive the selection of a calibration signal source from the calibration signal sources displayed on the device;

code configured to cause the device to display instructions for orienting the device relative to the calibration signal source;

code configured to cause the device to receive a signal from the calibration signal source into the device via a signal receiver array coupled to a direction-finding system in the device;

code configured to cause the device to measure a signal response induced by the signal in each signal receiver of the signal receiver array;

code configured to cause the device to determine, based on the signal response, if the received wireless signal quality is sufficient for use in calibration;

code configured to, if the quality of the received signal is sufficient for use in calibration, cause the device to determine orientation information for the device when the signal response is measured;

code configured to cause the device to store the signal response and the orientation information at various instances while moving the device in accordance with instructions displayed on the device; and

code configured to cause the device to calibrate the direction-finding system in the device based on the stored signal response and the orientation information.

9. The computer program product of claim 8, wherein the signal comprises packets, the code being further configured to cause the device to identify the calibration signal sources based on packet address information.

10. The computer program product of claim 8, wherein the code is further configured to cause the device to determine the signal quality based on at least one of signal to noise ratio or signal power level.

11. The computer program product of claim 8, wherein the orientation information includes at least a rotational angle provided by a sensor in the device, the sensor being at least one of an acceleration sensor configured to measure rotational acceleration or a compass.

12. The computer program product of claim 8, wherein moving the device comprises at least one of rotating the wireless communication device around a center point in the device or a user holding the wireless communication device while rotating their body in a circle.

13. The computer program product of claim 12, wherein the code further causes the device to take into account interference caused by the user when holding the device.

14. The computer program product of claim 8, wherein the code is further configured to cause the apparatus to create a matrix of calibration values in the device using the stored signal response and the orientation information.

15. A module, comprising:

at least one communication component coupled to a signal receiver array, and

at least one direction-finding component coupled to the communication component, the at least one direction-finding component being configured to;

identify calibration signal sources based on signals received in the device;

display an identification on the device for each of the calibration signal sources, the identification being derived from the received signals;

if more than one calibration signal source was identified, receive the selection of a calibration signal source from the calibration signal sources displayed on the device;

receive a signal from a signal source into the signal receiver array;

measure a signal response induced by the signal in each signal receiver of the signal receiver array;

determine, based on the signal response, if the received wireless signal quality is sufficient for use in calibration;

if the quality of the received signal is sufficient for use in calibration, determine orientation information for the device when the signal response is measured;

store the signal response and the orientation information at various instances while moving the device in accordance with instructions displayed on the device; and

calibrate the direction-finding system in the device based on the stored signal response and the orientation information.

16. The module of claim 15, wherein the signal receiver array is an antenna array.

17. The module of claim 15, wherein the orientation information is provided by a sensor coupled to the module and configured to provide at least one of orientation or acceleration information.

18. A device, comprising:

at least one processor; and

at least one memory including executable instructions, the at least one memory and the executable instructions being configured to, in cooperation with the at least one processor, cause the device to perform at least the following;

receive an activation of a calibration operation in the device;

identify calibration signal sources based on signals received in the device;

display an identification on the device for each of the calibration signal sources, the identification being derived from the received signals;

if more than one calibration signal source was identified, receive the selection of a calibration signal source from the calibration signal sources displayed on the device;

display instructions to a device user for orienting the device relative to the calibration signal source;

receive a signal from the calibration signal source into the device via a signal receiver array;

measure a signal response induced by the signal in each signal receiver of the signal receiver array;

determine, based on the signal response, if the received wireless signal quality is sufficient for use in calibration;

if the quality of the received signal is sufficient for use in calibration, determine orientation information for the device when the signal response is measured;

store the signal response and the orientation information at various instances while moving the device in accordance with instructions displayed on the device; and

calibrate the direction-finding system in the device based on the stored signal response and the orientation information.

19. The device of claim 18, wherein the signal receiver array is an antenna array.

20. The device of claim 18, wherein the orientation information is provided by a sensor integrated within the device and configured to provide at least one of orientation or acceleration information.

21. A system, comprising:

a device including at least a direction-finding system, a signal receiver array and a sensor; and

one or more signal sources;

the device receiving an activation of a calibration operation in the device;

the device identifying calibration signal sources based on signals received in the device and displaying an identification on the device for each of the calibration signal sources, the identification being derived from the received signals;

if more than one calibration signal source was identified, the device further receiving the selection of a calibration signal source from the calibration signal sources displayed on the device;

the device displaying instructions for orienting the device relative to the calibration signal source;

the device receiving a signal from the calibration signal source into the device via a signal receiver array, measuring a signal response induced by the signal in each signal receiver of the signal receiver array, and determining, based on the signal response, if the received wireless signal quality is sufficient for use in calibration;

if the quality of the received signal is sufficient for use in calibration, the device further determining orientation information for the device when the signal response is measured and storing the signal response and the orientation information at various instances while moving the device in accordance with instructions displayed on the device; and

the device calibrating the direction-finding system in the device based on the stored signal response and the orientation information.