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US 12,724,113 B2Granted
Device and method for removing clutter in radar system
AssigneeAgency for Defense Development
InventorsJi Hwan Yoon, Yong Min Kim, Won Jin Lee, Jieun Roh
Life of this patent
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Abstract
The present disclosure relates to a radar system including a pulse Doppler radar. A method of removing clutter according to the present disclosure includes obtaining chirp rate information on a chirp rate applied to a transmission signal of the pulse Doppler radar, determining a reference Doppler frequency for removing a clutter signal by considering the chirp rate information, and removing a signal having a frequency less than or equal to the reference Doppler frequency.
Claims7
A method of removing clutter in a radar system including a pulse Doppler radar, the method comprising:
- obtaining chirp rate information on a chirp rate applied to a transmission signal of the pulse Doppler radar;
- obtaining calculation information including a movement speed of the pulse Doppler radar, an altitude of the pulse Doppler radar, a wavelength of an operating frequency of the pulse Doppler radar, a first beam steering angle of the pulse Doppler radar, and a beam width of an antenna of the pulse Doppler radar;
- determining a reference Doppler frequency for removing a clutter signal by:
- determining a first calculation value based on the movement speed, the altitude, the chirp rate information, and the wavelength of the operating frequency;
- determining a second calculation value from the first calculation value based on a function that derives a real value;
- determining a second beam steering angle based on the second calculation value;
- determining a first Doppler frequency for the second beam steering angle;
- determining a second Doppler frequency for an angle obtained by adding an angle corresponding to the beam width to the first beam steering angle;
- determining a third Doppler frequency for an angle obtained by removing the angle corresponding to the beam width from the first beam steering angle;
- determining a fourth Doppler frequency for the first beam steering angle;
- and
- determining the reference Doppler frequency based on the first, second, third, and fourth Doppler frequencies;
- and
- removing a signal having a frequency less than or equal to the reference Doppler frequency.
11 more elements
A clutter removal device in a radar system including a pulse Doppler radar, the clutter removal device comprising:
- a processor,
- wherein the processor is configured to;
- obtain chirp rate information on a chirp rate applied to a transmission signal of the pulse Doppler radar;
- obtain calculation information including a movement speed of the pulse Doppler radar, an altitude of the pulse Doppler radar, a wavelength of an operating frequency of the pulse Doppler radar, a first beam steering angle of the pulse Doppler radar, and a beam width of an antenna of the pulse Doppler radar;
- determine a reference Doppler frequency for removing a clutter signal by:
- determine a first calculation value based on the movement speed, the altitude, the chirp rate information, and the wavelength of the operating frequency,
- determine a second calculation value from the first calculation value based on a function that derives a real value,
- determine a second beam steering angle based on the second calculation value,
- determine a first Doppler frequency for the second beam steering angle,
- determine a second Doppler frequency for an angle obtained by adding an angle corresponding to the beam width to the first beam steering angle,
- determine a third Doppler frequency for an angle obtained by removing the angle corresponding to the beam width from the first beam steering angle,
- determine a fourth Doppler frequency for the first beam steering angle, and
- determine the reference Doppler frequency based on the first, second, third, and fourth Doppler frequencies;
- and
- remove a signal having a frequency less than or equal to the reference Doppler frequency.
12 more elements
A method of removing clutter in a radar system including a pulse Doppler radar, the method comprising:
- obtaining chirp rate information on a chirp rate applied to a transmission signal of the pulse Doppler radar;
- obtaining calculation information including a movement speed of the pulse Doppler radar, an altitude of the pulse Doppler radar, a wavelength of an operating frequency of the pulse Doppler radar, a first beam steering angle of the pulse Doppler radar, and a beam width of an antenna of the pulse Doppler radar;
- determining a reference Doppler frequency for removing a clutter signal by:
- determining a plurality of Doppler frequencies based on the calculation information and the chirp rate information;
- and
- determining the reference Doppler frequency based on the plurality of Doppler frequencies;
- and
- removing a signal having a frequency less than or equal to the reference Doppler frequency, wherein each of the plurality of Doppler frequencies is determined based on Equation 4 below,
- f
-
- (
- ψ
- ,
- V
- ,
- B
- ,
- k
- ,
- λ
- )
- )
- =
- 2
-
- V
- λ
- -
- 2
-
- kH
- c
- 0
-
- sin
-
- (
- ψ
- )
- Equation
-
- 4
- where f indicates a Doppler frequency, V indicates the movement speed, λ indicates the wavelength of the operating frequency, c0 indicates the speed of light, k indicates the chirp rate, H indicates the altitude, and v indicates a beam steering angle.
40 more elements
Dependencies are inferred from the claim text.