CN114488035A - Method for measuring speed measurement precision of automobile radar - Google Patents
Method for measuring speed measurement precision of automobile radar Download PDFInfo
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- CN114488035A CN114488035A CN202011265604.0A CN202011265604A CN114488035A CN 114488035 A CN114488035 A CN 114488035A CN 202011265604 A CN202011265604 A CN 202011265604A CN 114488035 A CN114488035 A CN 114488035A
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- radar
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- speed measurement
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/50—Systems of measurement based on relative movement of target
- G01S13/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention relates to the technical field of radar speed measurement, in particular to a method for measuring the speed measurement precision of an automobile radar, which can avoid the speed measurement error caused by directly using the radar installation height to convert in the traditional speed measurement mode in the process of converting the radial speed and the radial distance measured by the speed measurement radar into the actual horizontal speed when a vehicle is measured by the speed measurement radar, can enable the converted speed to be closer to the real speed value, can realize the high-precision detection of the speed measurement radar, ensure the speed measurement precision of the vehicle, and can not be influenced by the vehicle height, can provide the basis for the corresponding target vehicle speed measurement precision requirement when the system is designed, can provide the target vehicle speed error requirement allowed by a traffic system, can accurately know the requirement of the application on the system parameters from the angle evaluation system parameters of the application effect, has great practical value.
Description
Technical Field
The invention relates to the technical field of radar speed measurement, in particular to a method for measuring the speed measurement precision of an automobile radar.
Background
The speed measuring radar is used for detecting the speed and the distance of a vehicle in traffic monitoring and feeding back the measured vehicle information to the video snapshot. The radar that tests the speed is installed on the horizontal pole of certain height off the ground usually, and slant detects vehicle information down, and the radar that tests the speed is at the testing process, through radar transmission electromagnetic wave signal, via the vehicle reflection back, and echo signal is received to the radar, through handling echo signal, can be with the distance, the speed information of obtaining the vehicle, but this information is the vehicle in the detection information of radar radial direction, and the real-time motion information of vehicle still needs the information conversion such as the detection height based on the radar to the information in the aspect of the vehicle motion.
According to the traditional speed measuring radar speed measuring method, a speed measuring radar is installed at a position H meters away from the ground, when a vehicle drives from far to near to the detection range of the speed measuring radar, the speed measuring radar obtains the distance and speed information of the vehicle through signal processing, but the speed measuring radar detects the radial speed and distance of the vehicle, the actual requirement is the horizontal distance and the horizontal speed of the vehicle, and therefore the speed and the distance of the detected vehicle need to be converted. Therefore, the method for measuring the speed measurement precision of the automobile radar is provided.
Disclosure of Invention
Aiming at the problems, the invention provides a method for measuring the speed measurement precision of an automobile radar, which aims to solve the problem that the speed and the distance of a vehicle need to be converted because the speed measurement radar detects the radial speed and the distance of the vehicle and actually needs the horizontal distance and the horizontal speed of the vehicle.
The invention is realized by the following technical scheme:
a method for measuring the speed measuring precision of an automobile radar comprises the following steps,
(1) the radar measures the radial speed and the radial distance of a target vehicle to obtain the radial speed and the radial distance of the target vehicle;
(2) receiving a millimeter wave signal sent by an automobile radar by using a millimeter wave front-end module, carrying out down-conversion, converting the millimeter wave signal to an intermediate frequency, and outputting the intermediate frequency signal outwards;
(3) acquiring a frequency signal output by a radar and calculating the instantaneous acceleration of a target vehicle according to the frequency signal;
(4) and imaging the obtained radar data, respectively imaging the same synthetic aperture radar echo simulation data with the target vehicle speed of V0-n delta V and V0+ n delta V, and outputting a simulation point target image.
(5) And measuring the actual horizontal speed of the vehicle by the speed measuring radar according to the simulation image, and measuring the speed with precision by using the vertical distance between the radar and the target vehicle as the actual detection height of the radar during conversion.
Preferably, in the step (2), the intermediate frequency signal sent by the millimeter wave front-end module is received, and the intermediate frequency signal is conditioned; the control host dispatches and controls the millimeter wave front end module, and collects the intermediate frequency signals sent by the digital intermediate frequency receiver to analyze so as to obtain signal parameters.
Preferably, in the step (3), the actual acceleration of the target vehicle is calculated by a frequency signal feedback time interval output by the radar.
Preferably, in the step (4), imaging processing is performed according to the radar data to obtain the actual moving image of the target vehicle.
Preferably, in the step (5), the measurement results of the radar are respectively converted into the actual horizontal speed of the vehicle by using more than two consecutive times of measurement results of the radar, wherein the vertical distance between the radar and the target vehicle is used as the actual detection height of the radar during conversion, and the height of the vehicle and the actual instantaneous speed of the vehicle after each conversion are obtained through construction.
The invention has the beneficial effects that:
the invention is convenient and practical, when the speed measurement is carried out on the vehicle based on the speed measurement radar, the radial speed and the radial distance measured by the speed measurement radar are converted into the actual horizontal speed, the influence of the height of the vehicle on the radar detection is considered, the vertical distance between the radar and the target vehicle is used as the actual detection height of the radar to participate in the conversion, the speed measurement error caused by directly using the installation height of the radar to carry out the conversion in the traditional speed measurement mode can be avoided, the speed obtained by the conversion can be more close to the actual speed value, the high-precision detection of the speed measurement radar can be realized, the speed measurement precision of the vehicle is ensured, the measurement precision can not be influenced by the height of the vehicle, the method can provide the basis for the corresponding speed measurement precision requirement of the target vehicle in the system design, the speed error requirement of the target vehicle allowed by a traffic system can be provided, and the system parameter is evaluated from the angle of application effect, the requirements of the application on system parameters can be accurately known, and the method has great practical value.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1: flow chart of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to FIG. 1: a method for measuring the speed measurement precision of an automobile radar is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
(1) the radar measures the radial speed and the radial distance of a target vehicle to obtain the radial speed and the radial distance of the target vehicle;
(2) receiving a millimeter wave signal sent by an automobile radar by using a millimeter wave front-end module, carrying out down-conversion, converting the millimeter wave signal to an intermediate frequency, and outputting the intermediate frequency signal outwards;
(3) acquiring a frequency signal output by a radar and calculating the instantaneous acceleration of a target vehicle according to the frequency signal;
(4) and imaging the obtained radar data, respectively imaging the same synthetic aperture radar echo simulation data with the target vehicle speed of V0-n delta V and V0+ n delta V, and outputting a simulation point target image.
(5) And measuring the actual horizontal speed of the vehicle by the speed measuring radar according to the simulation image, and measuring the speed with precision by using the vertical distance between the radar and the target vehicle as the actual detection height of the radar during conversion.
Specifically, in the step (2), an intermediate frequency signal sent by the millimeter wave front-end module is received, and the intermediate frequency signal is conditioned; the control host dispatches and controls the millimeter wave front end module, and collects the intermediate frequency signals sent by the digital intermediate frequency receiver to analyze so as to obtain signal parameters.
Specifically, in the step (3), the actual acceleration of the target vehicle is calculated through the frequency signal feedback time interval output by the radar.
Specifically, step (4), imaging processing is carried out according to the radar data, and the actual moving image of the target vehicle is obtained.
Specifically, in the step (5), the measurement results of the radar are respectively converted into the actual horizontal speed of the vehicle by using the measurement results of the radar which are more than two times in succession, wherein the vertical distance between the radar and the target vehicle is used as the actual detection height of the radar during conversion, and the height of the vehicle and the actual instantaneous speed of the vehicle after each conversion are obtained through construction.
When the invention is implemented, when the speed measurement is carried out on the vehicle based on the speed measurement radar, the radial speed and the radial distance measured by the speed measurement radar are converted into the actual horizontal speed, the influence of the height of the vehicle on the radar detection is considered, the vertical distance between the radar and the target vehicle is used as the actual detection height of the radar to participate in the conversion, the speed measurement error caused by directly using the installation height of the radar to carry out the conversion in the traditional speed measurement mode can be avoided, the speed obtained by the conversion can be more close to the actual speed value, the high-precision detection of the speed measurement radar can be realized, the speed measurement precision of the vehicle is ensured, the measurement precision can not be influenced by the height of the vehicle, the method can provide a basis for the corresponding speed measurement precision requirement of the target vehicle during the system design, the speed error requirement of the target vehicle allowed by a traffic system can be provided, and the system parameters can be evaluated from the angle of application effect, the requirements of the application on system parameters can be accurately known, and the method has great practical value.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. A method for measuring the speed measurement precision of an automobile radar is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
(1) the radar measures the radial speed and the radial distance of a target vehicle to obtain the radial speed and the radial distance of the target vehicle;
(2) receiving a millimeter wave signal sent by an automobile radar by using a millimeter wave front-end module, carrying out down-conversion, down-converting the millimeter wave signal to an intermediate frequency, and outputting the intermediate frequency signal outwards;
(3) acquiring a frequency signal output by a radar and calculating the instantaneous acceleration of a target vehicle according to the frequency signal;
(4) and imaging the obtained radar data, respectively imaging the same synthetic aperture radar echo simulation data with the target vehicle speed of V0-n delta V and V0+ n delta V, and outputting a simulation point target image.
And 2, (5) obtaining the actual horizontal speed of the vehicle measured by the speed measuring radar according to the simulation image, and obtaining the speed measurement with precision by using the vertical distance between the radar and the target vehicle as the actual detection height of the radar during conversion.
3. The method for measuring the speed measurement precision of the automotive radar as claimed in claim 1, wherein the method comprises the following steps: in the step (2), receiving the intermediate frequency signal sent by the millimeter wave front-end module, and conditioning the intermediate frequency signal; the control host dispatches and controls the millimeter wave front end module, and collects the intermediate frequency signals sent by the digital intermediate frequency receiver to analyze so as to obtain signal parameters.
4. The method for measuring the speed measurement precision of the automobile radar as claimed in claim 1, wherein the method comprises the following steps: and (3) calculating the actual acceleration of the target vehicle according to the frequency signal feedback time interval output by the radar.
5. The method for measuring the speed measurement precision of the automotive radar as claimed in claim 1, wherein the method comprises the following steps: and (4) performing imaging processing according to the radar data to obtain the actual moving image of the target vehicle.
6. The method for measuring the speed measurement precision of the automotive radar as claimed in claim 1, wherein the method comprises the following steps: in the step (5), the measurement results of the radar are respectively converted into the actual horizontal speed of the vehicle by using the measurement results of more than two consecutive times, wherein the vertical distance between the radar and the target vehicle is used as the actual detection height of the radar during conversion, and the height of the vehicle and the actual instantaneous speed of the vehicle after each conversion are constructed and obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011265604.0A CN114488035A (en) | 2020-11-13 | 2020-11-13 | Method for measuring speed measurement precision of automobile radar |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011265604.0A CN114488035A (en) | 2020-11-13 | 2020-11-13 | Method for measuring speed measurement precision of automobile radar |
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| CN114488035A true CN114488035A (en) | 2022-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011265604.0A Withdrawn CN114488035A (en) | 2020-11-13 | 2020-11-13 | Method for measuring speed measurement precision of automobile radar |
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2020
- 2020-11-13 CN CN202011265604.0A patent/CN114488035A/en not_active Withdrawn
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Application publication date: 20220513 |