METHOD AND APPARATUS FOR TRANSMITTER GEO-LOCATION IN MOBILE PLATFORMS

• US 20160381498A1
• Filed: 06/29/2015
• Published: 12/29/2016
• Est. Priority Date: 06/29/2015
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel IP Corporation (Intel Corporation)
• Inventors: Bar-Shalom, Ofer, Kasher, Assaf
• Granted Patent: US 9,872,136 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01S 3/46 using antennas spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems
• CPC Class Codes: G01S 3/74 Multi-channel systems specially adapted for direction-finding, i.e. having a single antenna system capable of giving simultaneous indications of the directions of different signals systems in which the directions of different signals are determined sequentially and displayed simultaneously G01S3/04, G01S3/14
• CPC Class Codes: H04W 4/02 Services making use of location information
• CPC Class Codes: H04W 4/029 Location-based management or tracking services

Abstract

Described herein are architectures, platforms and methods for implementing a direct estimation of a transmitter'"'"'s position based upon raw radio frequency (RF) signals that are received by a portable device. A mathematical operation such as a maximum-likelihood estimation (MLE) algorithm, which utilizes collected snapshots from the received raw RF signals as variables, is implemented to perform direct estimation.

Claims

1. A method of estimating a transmitter position, the method comprising:

receiving radio frequency (RF) signals by at least one antenna array;

phase shifting the received RF signal at each element of the least one antenna array;

combining the phase shifted RF signals and transforming the combined phase shifted RF signals into baseband signals;

converting the baseband signals into digital baseband signals; and

generating snapshots of the received digital baseband signals with a maximum likelihood estimation (MLE) operation to generate an estimated transmitter position.

2. The method as recited in claim 1, wherein the phase shifting of the received of the RF signals comprises generating phase shifts from a row of a Hadamard matrix.

3. The method as recited in claim 1, wherein the converting into digital baseband signals comprises using a single analog to digital (A/D) converter per antenna array.

4. The method as recited in claim 1, wherein the generating snapshots comprises generating separate snapshots per antenna array, and gathering the separate snapshots for all antenna arrays.

5. The method as recited in claim 1 further comprising filtering and amplifying the received RF signals prior to the phase shifting.

6. The method as recited in claim 1, wherein the converting into digital baseband signals comprises using different local oscillators per antenna array.

7. The method as recited in claim 6, wherein the antenna array is synchronized separate from any other antenna array.

8. The method as recited in claim 1, wherein the MLE is operation is based on a Gaussian additive noise.

9. The method as recited in claim 1, wherein the estimated position comprises an azimuth and an elevation of the transmitter position.

10. A device comprising:

at least one antenna array configured to receive radio frequency (RF) signals;

a phase-shifter component configured to each element of the at least one antenna array, the phase-shifter component is configured to shift phase of the received RF signal at each element of the least one antenna array;

a first combiner component configured to combine the phase shifted RF signals;

a converter component configured to transform the combined phase shifted RF signals into baseband signals;

an analog to digital (A/D) converter component configured to convert the baseband signals into digital baseband signals; and

a position estimator component configured to generate snapshots of the received digital baseband signals, with a maximum likelihood estimation (MLE) operation to generate an estimated transmitter position.

11. The device as recited in claim 10, wherein the phase-shifter component is configured to generate phase shifts from a row of a Hadamard matrix.

12. The device as recited in claim 10, wherein the converter component comprises a single analog to digital (A/D) converter per antenna array.

13. The device as recited in claim 10 further comprising a local oscillator configured to supply a down-converting signal to the converter component.

14. The device as recited in claim 13, wherein the antenna array is synchronized separate from any other antenna array.

15. The device as recited in claim 10, wherein the position estimator component is configured to calculate the MLE based on a Gaussian additive noise.

16. A receiver circuit comprising:

at least one antenna array with multiple elements configured to receive radio frequency (RF) signals on each element;

a phase-shifter component at each element of the at least one antenna array, the phase-shifter component configured to shift phase of the received RF signal at each element of the least one antenna array;

a first combiner component configured to combine the phase shifted RF signals from each element of the at least one antenna array;

a converter component configured to transform the combined phase shifted RF signals into baseband signals;

an analog to digital (A/D) converter component configured to convert the baseband signals into digital baseband signals; and

a position estimator component configured to perform a maximum likelihood estimation (MLE) operation on the received digital baseband signals to generate an estimated transmitter position.

17. The receiver circuitry as recited in claim 16, wherein the phase-shifter component is configured to generate phase shifts from a row of a Hadamard matrix.

18. The receiver circuitry as recited in claim 16, wherein the converter component comprises a single analog to digital (A/D) converter per antenna array.

19. The receiver circuitry as recited in claim 16 further comprising a local oscillator configured to supply a down-converting signal to the converter component.

20. The receiver circuitry as recited in claim 16 wherein the position estimator component is configured to calculate the MLE based on a Gaussian additive noise.