IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0144873
(2002-05-13)
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발명자
/ 주소 |
- Hager, James R.
- Jordan, Lavell
- Burlet, Todd R.
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출원인 / 주소 |
- Honeywell International Inc.
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
9 인용 특허 :
45 |
초록
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A method for processing radar return data to determine a physical angle, in aircraft body coordinates to a target, is disclosed. The radar return data includes a phase difference between radar return data received at an ambiguous radar channel and a left radar channel, a phase difference between rad
A method for processing radar return data to determine a physical angle, in aircraft body coordinates to a target, is disclosed. The radar return data includes a phase difference between radar return data received at an ambiguous radar channel and a left radar channel, a phase difference between radar return data received at a right radar channel and an ambiguous radar channel, and a phase difference between radar return data received at a right radar channel and a left radar channel. The method includes adjusting a phase bias for the three phase differences, resolving phase ambiguities between the three phase differences to provide a signal, and filtering the signal to provide a physical angle to the target in aircraft body coordinates.
대표청구항
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1. A method for processing radar return data to determine a physical angle, in aircraft body coordinates to a target, the radar return data including a phase difference between radar return data received at an ambiguous radar channel and a left radar channel, a phase difference between radar return
1. A method for processing radar return data to determine a physical angle, in aircraft body coordinates to a target, the radar return data including a phase difference between radar return data received at an ambiguous radar channel and a left radar channel, a phase difference between radar return data received at a right radar channel and an ambiguous radar channel, and a phase difference between radar return data received at a right radar channel and a left radar channel, said method comprising:adjusting a phase bias for the three phase differences; resolving phase ambiguities between the three phase differences to provide a signal; and filtering the signal to provide a physical angle to the target in aircraft body coordinates. 2. A method according to claim 1 wherein resolving phase ambiguities comprises:determining a plurality of physical angle solutions for each received phase difference; and determining an unambiguous physical angle based upon physical angle solutions which are approximately equal from each received phase difference. 3. A method according to claim 2 wherein determining a plurality of physical angle solutions for each received phase difference comprises:determining physical angle solutions according to Φ=sin?1(θ1/K1), where θ1, is determined as θ1=θLA, θ1=(θLA?360), and θ1=(θLA+360), K1 is [(360×SLA)/λ], where SLA is a separation between a left antenna element and an ambiguous antenna element in feet, λ is a wavelength of the radar signal in feet, and θLA is a received electrical phase angle difference between a left radar channel and an ambiguous radar channel; determining physical angle solutions according to Φ=sin?1(θ1/K2), where θ1, is determined as θ1=θAR, θ1=(θAR?720), θ1=(θAR?360), θ1=(θAR+360), and θ1=(θAR+720), K2 is [(360×SAR)/λ], where SAR is a separation between an ambiguous antenna element and a right antenna element in feet, λ is a wavelength of the radar signal in feet, and θAR is a received electrical phase angle difference between an ambiguous radar channel and a right radar channel; and determining physical angle solutions according to Φ=sin?1(θ1/K3), where θ1, is determined as θ1=θLR, θ1=(θLR?1080), θ1=(θLR?720), θ1=(θLR?360), θ1=(θLR+360), θ1=(θLR+720), and θ1=(θLR+1080), K3 is [(360×SLR)/λ], where SLR is a separation between a left antenna element and a right antenna element in feet, λ is a wavelength of the radar signal in feet, and θLR is a received electrical phase angle difference between a left radar channel and a right radar channel. 4. A method according to claim 3 wherein SLA is about 0.2917 feet, SAR is about 0.7083 feet, SLR is about one foot, and λ is about 0.2291 feet.5. A processor configured to:resolve phase ambiguities between multiple received phase difference signals by determining a plurality of physical angle solutions for each received phase difference; and determine a physical angle in aircraft body coordinates to a target based upon the resolved phase ambiguities, the phase difference signals having been determined based upon radar return data received at each of an ambiguous radar channel, a left radar channel, and a right radar channel. 6. A processor according to claim 5 wherein to determine a physical angle in aircraft body coordinates to a target said processor is configured to determine which physical angle solutions provide an unambiguous physical angle to the target.7. A processor according to claim 6 wherein the unambiguous physical angle is an angle which is a solution for at least one of the phase angle solutions for each received phase difference.8. A processor according to claim 5 wherein said processor is configured to determine the plurality of phase angle solutions according to:Φ=sin?1(θ1/K1), where θ1, is determined as θ1=θLA, θ1=(θLA?360), and θ1=(θLA+360), K1 is [(360×SLA)/λ], where SLA is a separation between a left antenna element and an ambiguous antenna element in feet, λ is a wavelength of the radar signal in feet, and θLA is a received electrical phase angle difference between a left radar channel and an ambiguous radar channel; Φ=sin?1(θ1/K2), where θ1, is determined as θ1=θAR, θ1=(θAR?720), θ1=(θAR?360), θ1=(θAR+360), and θ1=(θAR+720), K2 is [(360×SAR)/λ], where SAR is a separation between an ambiguous antenna element and a right antenna element in feet, λ is a wavelength of the radar signal in feet, and θAR is a received electrical phase angle difference between an ambiguous radar channel and a right radar channel; and Φ=sin?1(θ1/K3), where θ1, is determined as θ1=θLR, θ1=(θLR?1080), θ1=(θLR?720), θ1=(θLR?360), θ1=θLR+360), θ1=(θLR+720), and θ1=(θLR+080), K3 is [(360×SLR)/λ], where SLR is a separation between a left antenna element and a right antenna element in feet, λ is a wavelength of the radar signal in feet, and θLR is a received electrical phase angle difference between a left radar channel and a right radar channel. 9. A radar signal processing circuit comprising:a radar gate correlation circuit configured to sample radar return data from left, right, and ambiguous radar channels at a sampling rate; a correlation bass pass filter configured to stretch the sampled radar return data to a continuous wave (CW) signal; a mixer configured to down sample an in-phase component and a quadrature component of the CW signal to a doppler frequency; a band pass filter centered on the doppler frequency; a phase processor configured to receive processed radar return data from said band pass filter, said phase processor further configured to determine a phase difference between radar return data from an ambiguous channel and a left channel, a phase difference between radar return data from an right channel and the ambiguous channel, and a phase difference between radar return data from the right channel and the left channel; and a processing unit configured to receive the three phase differences, adjust a phase bias for the three phase differences, resolve phase ambiguities between the three phase differences to provide a signal, and filtering the signal to provide a physical angle to a target in aircraft body coordinates. 10. A radar signal processing circuit according to claim 9 wherein said processing unit is configured to resolve phase ambiguities by determining a plurality of physical angle solutions for each received phase difference.11. A radar signal processing circuit according to claim 10 wherein to provide a physical angle in aircraft body coordinates to a target said processing unit is configured to determine which physical angle solutions provide an unambiguous physical angle to the target.12. A radar signal processing circuit according to claim 11 wherein said processing unit configured to determine an unambiguous physical angle which is an angle that provides a solution for at least one of the phase angle solutions for each received phase difference.13. A radar signal processing circuit according to claim 10 wherein said processing unit is configured to determine a plurality of physical angle solutions for each received phase difference according toΦ=sin?1(θ1/K1), where (θ1, is determined as θ1=θLA, θ1=(θLA?360), and θ1=(θLA+360), K1 is [(360×SLA)/λ], where SLA is a separation between a left antenna element and an ambiguous antenna element in feet, λ is a wavelength of the radar signal in feet, and θLA is a received electrical phase angle difference between a left radar channel and an ambiguous radar channel; Φ=sin?1(θ1/K2), where θ1, is determined as θ1=θAR, θ1=(θAR?720), θ1=(θAR?360), θ1=(θAR+360), and θ1=(θAR720), K2 is [(360×SAR)/λ], where SAR is a separation between an ambiguous antenna element and a right antenna element in feet, λ is a wavelength of the radar signal in feet, and θAR is a received electrical phase angle difference between an ambiguous radar channel and a right radar channel; and Φ=sin?1(θ1/K3) where θ1, is determined as θ1=θLR, θ1=(θLR?1080), θ1=(θLR?720), θ1=(θLR?360), θ1=(θLR+360), θ1=(θLR+720), and θ1=(θLR+1080), K3 is [(360×SLR)/λ], where SLR is a separation between a left antenna element and a right antenna element in feet, λ is a wavelength of the radar signal in feet, and θLR is a received electrical phase angle difference between a left radar channel and a right radar channel. 14. A radar signal processing circuit according to claim 13 Wherein said processing unit is configured an SLA of about 0.2917 feet, an SAR of about 0.7083 feet, an SLR of about one foot, and λ of about 0.2291 feet.
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