Method for angle of arrival determination on frequency hopping air interfaces
First Claim
1. A method of determining an angle of arrival of a frequency hopping communication signal comprising the steps of:
- obtaining a frequency hopping sequence of the communication signal;
receiving the communication signal over multiple hops of the same frequency;
injecting a calibration signal at one frequency of the frequency hopping sequence of the signal in response to receipt of said communication signal;
determining a calibration coefficient C1 for said one frequency; and
, determining the AOA of the signal based on the hops of the communication signal having said one frequency and the calibration coefficient C1.
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Abstract
A method for calibrating an antenna and signal processing system enabling angle or arrival (AOA) determination for a frequency hopping signal, in which a calibration coefficient is determined in response to one or more calibration signals injected into the system at one or more of the frequencies in the hopping sequence and proximate in time to reception of the communication signal. The calibration coefficients are reflective of a frequency and time dependent parameter of a path between the antenna and wireless location sensor. The AOA is determined as a function of the calibration coefficient and the radio frequency energy of the received communication signal. Several embodiment of the method are illustrated.
53 Citations
22 Claims
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1. A method of determining an angle of arrival of a frequency hopping communication signal comprising the steps of:
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obtaining a frequency hopping sequence of the communication signal;
receiving the communication signal over multiple hops of the same frequency;
injecting a calibration signal at one frequency of the frequency hopping sequence of the signal in response to receipt of said communication signal;
determining a calibration coefficient C1 for said one frequency; and
,determining the AOA of the signal based on the hops of the communication signal having said one frequency and the calibration coefficient C1. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of determining an angle of arrival of a frequency hopping communication signal comprising the steps of:
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obtaining a frequency hopping sequence of the communication signal;
injecting a calibration signal at one frequency of the frequency hopping sequence of the communication signal in response to receipt of said communication signal;
determining a calibration coefficient C1 for said one frequency;
storing said calibration coefficient C1;
receiving the communication signal over multiple hops of the same frequency; and
,determining the AOA of the signal based on the hops of the signal having said one frequency and the calibration coefficient C1. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. In a network overlay geolocation system, a method for locating a mobile appliance including determining the AOA of an uplink signal from the mobile appliance at a base station from measurements, by a wireless location sensor, of an attribute of the uplink signal and a frequency specific calibration of a path between a multi element antenna array and the wireless location sensor, the improvement comprising the steps of:
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(a) collecting segments of a frequency hopping signal associated with each frequency hop;
(b) calibrating the path, at a predetermined frequency, proximate in time to the collecting of each of the segments; and
,(c) estimating the AOA of a frequency hopping signal from the collected segments and the path calibrations at the predetermined frequency. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification