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US 12,693,379 B2Granted
Method and apparatus for calibrating installation error in pitch angle of traffic radar, and storage medium
AssigneeZhejiang Uniview Technologies Co., Ltd.
InventorsNing Jiang, Ningning Cao
Life of this patent
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Abstract
Provided are a method and apparatus for calibrating an installation error in a pitch angle of a traffic radar, and a storage medium. The method includes changing the frequency of a traffic radar according to a preset strategy within a preset frequency range; acquiring energy values of echo signals of a preset target at different frequencies in sequence; and in response to determining that the acquired energy values of the echo signals satisfy a preset condition, determining the frequency corresponding to the maximum echo signal energy value as the operating frequency of the traffic radar to calibrate the installation error in the pitch angle of the traffic radar. The preset target is disposed on the ground.
Claims14
A method for calibrating an installation error in a pitch angle of a traffic radar, comprising:
- changing frequency of the traffic radar according to a preset strategy within a preset frequency range;
- acquiring energy values of echo signals of a preset target at different frequencies in sequence;
- and
- in response to determining that the acquired energy values of the echo signals satisfy a preset condition, determining frequency corresponding to a maximum energy value of the echo signals as operating frequency of the traffic radar to calibrate the installation error in the pitch angle of the traffic radar;
- wherein the preset target is disposed on the ground, and in a horizontal direction of the ground, a distance between the preset target and a projection point of the traffic radar in the horizontal direction is a length of a projection of a central beam of the traffic radar in the horizontal direction when the traffic radar is mounted at an expected pitch angle;
- wherein the preset frequency range is determined according to a preset maximum calibration angle and a preset minimum calibration angle of the traffic radar;
- wherein determining the preset frequency range according to the preset maximum calibration angle and the preset minimum calibration angle of the traffic radar comprises:
- determining a first wavelength when the preset maximum calibration angle is calculated according to a preset equation and determining a first frequency value according to the first wavelength;
- and
- determining a second wavelength when the preset minimum calibration angle is calculated according to the preset equation and determining a second frequency value according to the second wavelength;
- wherein the preset frequency range is a range from the first frequency value to the second frequency value, and the preset frequency range comprises the first frequency value and the second frequency value;
- the preset equation is as follows:
- θ
- =
- arcsin
-
- (
- λ
- λ
- g
- -
- λ
- L
- f
- +
- L
- P
- )
- ,
- wherein θ denotes the preset maximum calibration angle or the preset minimum calibration angle, Lf+Lp denotes a distance between oscillators of two adjacent radiating units of an antenna of the traffic radar, Lf denotes a feed line length between the two adjacent radiating units of the antenna of the traffic radar, Lp denotes a patch element length of a radiating unit of the antenna of the traffic radar, λ denotes a wavelength of a millimeter wave of the traffic radar in air, and λg denotes a wavelength of the millimeter wave of the traffic radar on a dielectric substrate.
27 more elements
An apparatus for calibrating an installation error in a pitch angle of a traffic radar, comprising:
- at least one processor;
- and
- a memory communicatively connected to the at least one processor;
- wherein the memory stores instructions executable by the at least one processor to cause the at least one processor to perform a method for calibrating an installation error in a pitch angle of a traffic radar, wherein the method comprises:
- changing frequency of the traffic radar according to a preset strategy within a preset frequency range;
- acquiring energy values of echo signals of a preset target at different frequencies in sequence;
- and
- in response to determining that the acquired energy values of the echo signals satisfy a preset condition, determining frequency corresponding to a maximum energy value of the echo signals as operating frequency of the traffic radar to calibrate the installation error in the pitch angle of the traffic radar;
- wherein the preset target is disposed on the ground, and in a horizontal direction of the ground, a distance between the preset target and a projection point of the traffic radar in the horizontal direction is a length of a projection of a central beam of the traffic radar in the horizontal direction when the traffic radar is mounted at an expected pitch angle;
- wherein the preset frequency range is determined according to a preset maximum calibration angle and a preset minimum calibration angle of the traffic radar;
- wherein determining the preset frequency range according to the preset maximum calibration angle and the preset minimum calibration angle of the traffic radar comprises:
- determining a first wavelength when the preset maximum calibration angle is calculated according to a preset equation and determining a first frequency value according to the first wavelength;
- and
- determining a second wavelength when the preset minimum calibration angle is calculated according to the preset equation and determining a second frequency value according to the second wavelength;
- wherein the preset frequency range is a range from the first frequency value to the second frequency value, and the preset frequency range comprises the first frequency value and the second frequency value;
- the preset equation is as follows:
- θ
- =
- arcsin
-
- (
- λ
- λ
- g
- -
- λ
- L
- f
- +
- L
- P
- )
- ,
- wherein θ denotes the preset maximum calibration angle or the preset minimum calibration angle, Lf+Lp denotes a distance between oscillators of two adjacent radiating units of an antenna of the traffic radar, Lf denotes a feed line length between the two adjacent radiating units of the antenna of the traffic radar, Lp denotes a patch element length of a radiating unit of the antenna of the traffic radar, λ denotes a wavelength of a millimeter wave of the traffic radar in air, and λg denotes a wavelength of the millimeter wave of the traffic radar on a dielectric substrate.
31 more elements
Dependencies are inferred from the claim text.