Method for calibrating an AOA location system for all frequencies in a frequency hopping signal
First Claim
1. A method of calibrating an antenna array and signal processing system for receiving a frequency hopping communication signal comprising the steps of:
- obtaining a frequency hopping sequence of the communication signal;
receiving the communication signal;
injecting a calibration signal at each of at least two frequencies of the frequency hopping sequence of the communication signal in response to receipt of said communication signal;
determining calibration coefficients C1 and C2 for said at least two frequencies;
applying C1 and C2 to a received signal, anddetermining the AOA of the communication signal based on said communication signal, C1, and C2.
17 Assignments
0 Petitions
Accused Products
Abstract
A method for calibrating an antenna and signal processing system enabling angle of 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.
-
Citations
22 Claims
-
1. A method of calibrating an antenna array and signal processing system for receiving a frequency hopping communication signal comprising the steps of:
-
obtaining a frequency hopping sequence of the communication signal; receiving the communication signal; injecting a calibration signal at each of at least two frequencies of the frequency hopping sequence of the communication signal in response to receipt of said communication signal; determining calibration coefficients C1 and C2 for said at least two frequencies; applying C1 and C2 to a received signal, and determining the AOA of the communication signal based on said communication signal, C1, and C2. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A method of calibrating an antenna array and signal processing system for receiving a frequency hopping communication signal comprising the steps of:
-
obtaining a frequency hopping sequence of the communication signal; injecting a calibration signal at each of at least two frequencies of the frequency hopping sequence of said communication signal; determining calibration coefficients C1 and C2 for said at least two frequencies; storing said calibration coefficients C1 and C2; receiving the communication signal; applying C1 and C2 to the communication signal, and determining the AOA of the communication signal based on said communication signal, C1, and C2. - View Dependent Claims (9, 10, 11)
-
-
12. A method of calibrating an antenna array and signal processing system for receiving a frequency hopping communication signal comprising the steps of:
-
periodically injecting calibration signals at frequencies of a known frequency band for the communication signal; determining and storing calibration coefficients for said frequencies; obtaining the frequency hopping sequence of the communication signal; receiving said communication signal; applying the stored calibration coefficients corresponding with the frequencies of the received communication signal to the received communication signal, and determining the AOA of the communication signal based on said communication signal and said stored calibration coefficients. - View Dependent Claims (13, 14)
-
-
15. A method of calibrating an antenna array and signal processing system for receiving a frequency hopping communication signal comprising the steps of:
-
periodically injecting calibration signals at frequencies of known hopping sequences; determining and storing calibration coefficients for said frequencies; determining relationships between the calibration coefficient of one frequency of said frequencies to the calibration coefficients of each of the other frequencies of said frequencies using the stored calibration coefficients; obtaining the frequency hopping sequence of the communication signal; receiving said communication signal; injecting a calibration signal at said one frequency in response to receipt of said communication signal; determining a calibration coefficient C1 for said one frequency; determining second calibration coefficients for said other frequencies based on the calibration coefficient for said one frequency and said determined relationships; applying the second calibration coefficients corresponding to the frequencies of the received signal to the received signal. - View Dependent Claims (16, 17, 18)
-
-
19. In a RF communication system where a signal changes frequency according to a predetermined sequence, and where the distortion of a multi-antenna element and signal processing system is a function of frequency and the derived accuracy of the multi-antenna element, and where the signal processing system requires portions of the signal to be independently calibrated, and where the time duration of the transition of the signal between any two particular frequencies is too short to allow for said independent calibrations to occur, a method for calibrating the communication system comprising the steps of:
-
receiving the signal; injecting calibration signals at frequencies of at least two frequencies of the predetermined sequence of the signal in response to receipt of said signal; determining calibration coefficients for each of the frequencies in the predetermined sequence from the injected calibration signals; applying the calibration coefficients to the received signal thereby independently calibrating the system for each frequency of the signal, and determining the AOA of the signal based on said signal and said calibration coefficients. - View Dependent Claims (20, 21, 22)
-
Specification