CN114152924A - Quick detection method and device for performance of Doppler radar module - Google Patents
Quick detection method and device for performance of Doppler radar module Download PDFInfo
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- CN114152924A CN114152924A CN202111505588.2A CN202111505588A CN114152924A CN 114152924 A CN114152924 A CN 114152924A CN 202111505588 A CN202111505588 A CN 202111505588A CN 114152924 A CN114152924 A CN 114152924A
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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
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Abstract
The invention discloses a method and a device for quickly detecting the performance of a Doppler radar module, belonging to the field of millimeter wave radar testing.A Doppler radar module to be tested is horizontally arranged right opposite to a fan, the fan rotates at a constant speed, and the Doppler radar module sends out a detection signal to detect a detection target; when a detection signal reaches the detection target, generating an echo signal, wherein the echo signal comprises RCS strength and speed components of each point in the fan blade; and the Doppler radar module receives the echo signal and evaluates the channel performance of the Doppler radar module according to the RCS strength and the velocity component of each point in the fan blade. The method simulates a moving target with a specific speed by utilizing the uniform motion characteristic of the fan, modulates and demodulates the RCS strength and the speed component of the fan blade, can judge the sensitivity of the radar module by comparing the RCS strength and the speed component detected by the standard radar module under the scene, and is integrated, simple to operate, cost-saving and suitable for batch production.
Description
Technical Field
The invention relates to the field of millimeter wave radar testing, in particular to a quick detection method and device for performance of a Doppler radar module.
Background
The millimeter wave radar is a radar which works in a millimeter wave band (millimeter wave) for detection, and the frequency domain is 30-300 GHz. The civil millimeter wave frequency ranges mainly include 24G, 60G, 77G and the like, and the principle is that relevant data of a detected target is modulated and demodulated by transmitting and receiving returned electromagnetic waves.
With the improvement of the semiconductor process level, the millimeter wave radar chip is developed and popularized in a large quantity and is rapidly popularized in the fields of automobile automatic driving radars, life detection radars and the like; the Doppler radar has the characteristics of simple design, low cost, wide application and the like, and has a large application market. Because the doppler radar can only detect the moving target, it is difficult to provide multiple expensive motion simulation instruments in laboratories and production sites during research, development, and production processes, and therefore, in order to meet the application requirements, a simple moving target testing device with small volume and low cost needs to be proposed.
According to the Doppler principle, electromagnetic waves irradiate on a moving metal target, the frequency of reflected waves generated on the surface of the metal can be changed, and if the moving target is far away, the frequency of the reflected waves can be lowered; if the moving object is close, the frequency of the reflected wave becomes high. A doppler radar is a radar that detects the position and relative movement velocity of a moving object using the doppler effect. When the radar transmits a pulse wave with fixed frequency to scan the space, if a moving object is encountered, the radar can receive a reflected wave with the frequency changed by being reflected by the moving object and output a difference frequency signal by frequency mixing in the radar; the relative motion speed of the moving object can be calculated by using the frequency of the difference frequency signal; in addition, the amplitude of the difference frequency signal can reflect the size and distance of a moving target, and the sign of the difference frequency signal can also reflect the relative movement direction of the target; only when the target moves, the Doppler radar can output signals, and when the target is static, the output is zero; when the target moves at a constant speed, the radar outputs a difference frequency signal with stable frequency. Therefore, during the process of doppler radar debugging and performance evaluation, a real target or a simulated target moving at a constant speed needs to be provided.
In the existing Doppler radar test, one is to adopt a radar simulator, a frequency spectrograph, a vector network analyzer and other special equipment to simulate a moving target, but the equipment has high value, the test process is complex, and the test period is long; the other is field testing using application scenarios, which is time and labor consuming, and can present situations where environmental conditions are not controllable, and not practical for mass production.
Disclosure of Invention
The invention aims to overcome the problems of Doppler radar testing in the prior art and provides a quick detection method and device for the performance of a Doppler radar module.
The purpose of the invention is realized by the following technical scheme:
a fast detection method for the performance of a Doppler radar module is provided, and the method comprises the following steps:
the method comprises the following steps of (1) horizontally setting a Doppler radar module to be tested over a fan, and keeping the horizontal distance between the Doppler radar module and the fan unchanged;
rotating the fan at a constant speed, and enabling the Doppler radar module to send a detection signal to detect a detection target;
when the detection signal reaches the detection target, generating an echo signal, wherein the echo signal comprises RCS strength and speed components of each point in the fan blade;
and the Doppler radar module receives the echo signal and evaluates the channel performance of the Doppler radar module according to the RCS strength and the velocity component of each point in the fan blade.
As an option, a method for fast detection of performance of a doppler radar module, which evaluates channel performance of the doppler radar module according to RCS strength and velocity components of each point in the fan, comprises:
and judging the sensitivity of the Doppler radar module to be detected by comparing the RCS intensity and the speed component detected by the standard radar module under the scene.
As an option, a method for quickly detecting the performance of a Doppler radar module is provided, wherein the instantaneous rotating speed component of each point in the fan blade relative to the radar is v1Where v is k r, k represents the rotation speed of the fan, r represents the distance of each point of the fan from the center of the fan, and θ represents the deflection angle of each point of the fan.
As an option, a fast detection method for the performance of the Doppler radar module is provided, wherein the rotating speed k of the fan is changed, and the RCS strength and the speed component of each point in the fan blade at different specific speeds are measured.
As an option, a method for quickly checking the performance of the doppler radar module changes the horizontal distance between the doppler radar module and the fan, and measures the performance of the doppler radar module at different distances.
The invention also provides a device for quickly detecting the performance of the Doppler radar module, which comprises:
a base;
the fan is arranged on the base and used for simulating a moving target with a specific speed;
the Doppler radar module that awaits measuring, the Doppler radar module sets up on the base, and just right the fan, the Doppler radar module is used for to the motion of fan flabellum is surveyed.
As an option, a device is examined soon to doppler radar module performance, the device still includes metal shielding cover, metal shielding cover sets up between doppler radar module and the fan.
As an option, the device is examined soon of Doppler radar module performance, the Doppler radar module pass through module support piece with the base is connected, still be equipped with the motor on the base, the motor with the fan is connected, the motor pass through motor support piece with the base is connected.
As an option, the module supporting piece and the motor supporting piece are connected with the base through self-locking sliding blocks below the module supporting piece and the motor supporting piece.
As an option, the device for quickly detecting the performance of the Doppler radar module is characterized in that windows are formed in two ends of the metal shielding cover, the Doppler radar module and the fan are respectively arranged at the windows in the two ends of the metal shielding cover, and the Doppler radar module is opposite to the center of the fan.
It should be further noted that the technical features corresponding to the above options can be combined with each other or replaced to form a new technical solution without conflict.
Compared with the prior art, the invention has the beneficial effects that:
(1) the method simulates a moving target with a specific speed by utilizing the uniform motion characteristic of the fan and the difference of the rotating speed of each point of the fan blade relative to the radar, modulates and demodulates the RCS strength and the speed component of the fan blade, can judge the sensitivity of the radar module by comparing the RCS strength and the speed component detected by the standard radar module under the scene, has fixed distance between the fan and the radar module, and can realize the evaluation of the performance of a radar channel without moving the moving target back and forth.
(2) The testing device is integrated, is simple to operate, saves cost, has the testing time of a single module less than 5 seconds, and greatly improves the feasibility of full testing in the batch production process of the radar module.
(3) The influence of the environment on the sensitivity test is weakened through the metal shielding cover, the cost of the metal shielding cover is far lower than that of a microwave darkroom, the volume is smaller, and the metal shielding cover is easier to apply in batches.
(4) The testing device of the invention ensures that the centers of the Doppler radar module and the fan blade 2 are consistent through the module support piece and the motor support piece, thereby ensuring the testing accuracy.
(5) The testing device can adjust the horizontal distance between the Doppler radar module and the fan through the self-locking sliding block, and simulate and measure the performance of the Doppler radar module at different distances.
Drawings
FIG. 1 is a schematic flow chart of a fast detection method for performance of a Doppler radar module according to the present invention;
FIG. 2 is a schematic diagram illustrating the calculation of the relative rotation speed between the fan blades and the radar during the rotation of the fan according to the present invention;
FIG. 3 is a schematic structural diagram of a fast detection apparatus for performance of a Doppler radar module according to the present invention;
FIG. 4 is a schematic structural diagram of a quick test device with a metal shielding case according to the present invention;
fig. 5 is a schematic structural diagram of the quick test device with the self-locking slider according to the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood 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.
In the description of the present invention, it should be noted that directions or positional relationships indicated by "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are directions or positional relationships described based on the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention mainly tests the detection performance of the radar on a moving target, utilizes the uniform motion characteristic of the fan to simulate the moving target with a specific speed, and in the rotation process of the fan, the rotating speeds of various points of fan blades are different relative to the radar, the rotating speeds of various points are different relative to the radar, and the strength (equivalent RCS) of signals with different rotating speeds is related to the distance between the radar and the fan, the size of the fan blades, the rotating speed and the like. In the whole machine scheme, the test platform is integrated and realizes the performance of the radar receiving and transmitting channel with high efficiency.
Example 1
In an exemplary embodiment, a fast detection method for performance of a doppler radar module is provided, as shown in fig. 1, the method includes:
the method comprises the following steps of (1) horizontally setting a Doppler radar module to be tested over a fan, and keeping the horizontal distance between the Doppler radar module and the fan unchanged;
rotating the fan at a constant speed, and enabling the Doppler radar module to send a detection signal to detect a detection target;
when the detection signal reaches the detection target, generating an echo signal, wherein the echo signal comprises RCS strength and speed components of each point in the fan blade;
and the Doppler radar module receives the echo signal and evaluates the channel performance of the Doppler radar module according to the RCS strength and the velocity component of each point in the fan blade.
The invention utilizes the uniform motion characteristic of the fan and the different rotating speeds of all points of the fan blade relative to the radar to simulate the moving target with specific speed, in the rotating process of the fan, the rotating speeds of all points of the fan blade relative to the radar are different, the rotating speeds of all points relative to the radar are different, the strength (equivalent RCS) of signals with different rotating speeds is related to the distance between the radar and the fan, the size of the fan blade, the rotating speed and the like, but for the fan with constant speed, the strength of an echo signal with specified speed is unchanged, and the strength of a radar receiving signal is only related to the strength of a radar transmitting signal and the gain of a radar receiving channel, so that the invention can be used for evaluating the performance of a radar channel.
RCS intensity and speed components of fan blades are modulated and demodulated, the sensitivity of the radar module can be judged by comparing the RCS intensity and the speed components detected by the standard radar module under the scene, the distance between the fan and the radar module is fixed, and the performance of a radar channel can be evaluated without moving a moving target back and forth.
Furthermore, because the rotating speed of the fan is fixed, the shape of the fan blade, the relative position of the fan and the radar and the like are fixed, and the strength value of the specific speed signal received by the radar is determined under the condition that the parameters such as the radar signal transmitting power, the transmitting-receiving antenna efficiency, the radar receiving channel gain and the like of the tested radar are determined. The test system can provide a test data range of qualified radar signals through test calibration, so that radar test is realized.
Further, the radar test calibration method comprises the following steps:
1) under the given test system and implementation conditions, the rotating speed of the constant-speed fan is determined to be k; determining parameters (including fan blade shape, length, deflection angle and the like) of the fan blade; determining the installation distance d between the radar and the fan;
2) testing a batch of radars with qualified parameters under the conditions, wherein the number of the radars is n; collecting parameters (motion amplitude A and maximum speed V) of each radar output motion target;
3) and carrying out statistical analysis on the acquired data, and determining the parameter intervals of the radar parameters A and V, namely realizing the calibration work of the test system.
Further, the estimating the channel performance of the doppler radar module according to the RCS strength and the velocity component of each point in the fan blade includes:
and judging the sensitivity of the Doppler radar module to be detected by comparing the RCS intensity and the speed component detected by the standard radar module under the scene.
Further, as shown in fig. 2, the fan rotates at a constant speed, the radar is placed on the front surface of the fan, the fan has a deflection angle, and the instantaneous rotational speed component of each point in the fan blade relative to the radar is v1Where v is k r, k represents the rotational speed of the fan, and r represents the position of each point of the fan blade relative to the center of the fanThe distance θ represents the deflection angle of each point of the fan blade. Let the highest point of the fan blade be v1The range of the rotation speed of each point relative to the radar is 0-v1。
Further, the rotation speed k of the fan is changed, and the RCS intensity and the speed component of each point in the fan blade under different specific speeds are measured.
Furthermore, the horizontal distance between the Doppler radar module and the fan is changed, and the performance of the Doppler radar module under different distances is measured.
Example 2
In another embodiment, a fast detection apparatus for performance of a doppler radar module is provided, as shown in fig. 3, the apparatus includes:
a base 1;
the fan 2 is arranged on the base 1, and the fan 2 is used for simulating a moving object with a specific speed;
the Doppler radar module 3 that awaits measuring, Doppler radar module 3 sets up on the base 1, and just right fan 2, Doppler radar module 3 is used for to the motion of 2 flabellums of fan is surveyed.
Specifically, according to the doppler principle, electromagnetic waves are irradiated on a moving metal target, the frequency of reflected waves generated on the metal surface changes, and if the moving target is far away, the frequency of the reflected waves becomes low; if the moving object is close, the frequency of the reflected wave becomes high. A doppler radar is a radar that detects the position and relative movement velocity of a moving object using the doppler effect. Moving objects are moved back and forth on the base as in prior art CN 113534080A.
And the device of this application is when testing, fixes the doppler radar module 3 and the fan 2 that awaits measuring respectively on base 1 for the distance between doppler radar module 3 and the fan 2 remains unchanged in a test, need not let fan 2 come back and forth relatively on base 1, and the selection fan 2 of making a new way is as the motion target, has utilized the at the uniform velocity motion characteristic of fan, simulates the motion target of specific speed. Specifically, in the rotation process of the fan, the rotating speeds of all points of the fan blade relative to the radar are different, and the rotating speeds of all points relative to the radar are different, so that the relative motion between the target and the radar is realized under the condition that the horizontal distance is not changed.
Further, the strength (equivalent RCS) of signals with different rotating speeds is related to the distance between the radar and the fan, the size of fan blades, the rotating speed and the like, but for the fan with the fixed speed, the strength of a specified speed echo signal is unchanged, and the strength of a radar receiving signal is only related to the strength of a radar transmitting signal and the gain of a radar receiving channel, so that the strength can be used for evaluating the performance of a radar channel.
Example 3
Based on embodiment 2, a device for quickly detecting the performance of a doppler radar module is provided, as shown in fig. 4, the device further includes a metal shielding cover 4 and a module interface board 6, and the metal shielding cover 4 is disposed between the doppler radar module 3 and the fan 2.
Particularly, the influence of the environment on the sensitivity test is weakened through the metal shielding cover, the cost of the metal shielding cover is far lower than that of a microwave darkroom, the volume is smaller, and the metal shielding cover is easier to apply in batches. The module interface board 6 is used for receiving and processing the detection information of the doppler radar module 3.
Example 4
Provide a device is examined soon of doppler radar module performance based on embodiment 3, as shown in fig. 5, doppler radar module 3 pass through module support piece 31 with base 1 is connected, still be equipped with motor 5 on the base 1, motor 5 with fan 2 is connected, motor 5 pass through motor support piece 51 with base 1 is connected. The module support 31 includes a turning support 312 and a base support 311. Make the doppler radar module unanimous with the center of flabellum 2 through module support piece and motor support piece, guarantee the accuracy of test.
Further, the module supporting piece 31 and the motor supporting piece 51 are connected with the base 1 through self-locking sliders 7 below the quick detection device for the performance of the Doppler radar module. The testing device can adjust the horizontal distance between the Doppler radar module and the fan through the self-locking sliding block, and simulate and measure the performance of the Doppler radar module at different distances.
Further, a device is examined soon to doppler radar module performance, 4 both ends of metallic shield cover are windowed, doppler radar module 3 and fan 2 are established respectively the window department at 4 both ends of metallic shield cover, doppler radar module 3 is just to the center of fan 2.
The above detailed description is for the purpose of describing the invention in detail, and it should not be construed that the detailed description is limited to the description, and it will be apparent to those skilled in the art that various modifications and substitutions can be made without departing from the spirit of the invention.
Claims (10)
1. A method for fast detection of performance of a Doppler radar module is characterized by comprising the following steps:
the method comprises the following steps of (1) horizontally setting a Doppler radar module to be tested over a fan, and keeping the horizontal distance between the Doppler radar module and the fan unchanged;
rotating the fan at a constant speed, and enabling the Doppler radar module to send a detection signal to detect a detection target;
when the detection signal reaches the detection target, generating an echo signal, wherein the echo signal comprises RCS strength and speed components of each point in the fan blade;
and the Doppler radar module receives the echo signal and evaluates the channel performance of the Doppler radar module according to the RCS strength and the velocity component of each point in the fan blade.
2. The method of claim 1, wherein the estimating the channel performance of the doppler radar module according to the RCS strength and velocity components of each point in the fan comprises:
and judging the sensitivity of the Doppler radar module to be detected by comparing the RCS intensity and the speed component detected by the standard radar module under the scene.
3. According toA method as claimed in claim 1, wherein the instantaneous rotational speed component of each point in the sector with respect to the radar is v1Where v is k r, k represents the rotation speed of the fan, r represents the distance of each point of the fan from the center of the fan, and θ represents the deflection angle of each point of the fan.
4. The method of claim 3, wherein the RCS intensity and velocity components at different points in the fan blade at different specific speeds are measured by varying the speed k of the fan.
5. The method of claim 1, wherein the performance of the Doppler radar module is measured at different distances by varying the horizontal distance between the Doppler radar module and the fan.
6. An apparatus for fast detection of performance of a doppler radar module, the apparatus comprising:
a base (1);
the fan (2), the said fan (2) is set up on the said base (1), the said fan (2) is used for imitating the movement target of the particular speed;
the Doppler radar device comprises a Doppler radar module (3) to be detected, wherein the Doppler radar module (3) is arranged on the base (1) and just opposite to the fan (2), and the Doppler radar module (3) is used for detecting the movement of fan blades of the fan (2).
7. A device for fast detection of the performance of a Doppler radar module according to claim 6, characterized in that said device further comprises a metal shield (4), said metal shield (4) being arranged between said Doppler radar module (3) and said fan (2).
8. The device for rapidly detecting the performance of the Doppler radar module according to claim 7, wherein the Doppler radar module (3) is connected to the base (1) through a module support member (31), the base (1) is further provided with a motor (5), the motor (5) is connected to the fan (2), and the motor (5) is connected to the base (1) through a motor support member (51).
9. The device for rapidly testing the performance of the Doppler radar module according to claim 8, wherein the module support member (31) and the motor support member (51) are connected to the base (1) through self-locking sliders (7).
10. The device for rapidly detecting the performance of the doppler radar module according to claim 8, wherein windows are formed at two ends of the metal shielding case (4), the doppler radar module (3) and the fan (2) are respectively disposed at the windows at two ends of the metal shielding case (4), and the doppler radar module (3) faces the center of the fan (2).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111505588.2A CN114152924A (en) | 2021-12-10 | 2021-12-10 | Quick detection method and device for performance of Doppler radar module |
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| CN202111505588.2A CN114152924A (en) | 2021-12-10 | 2021-12-10 | Quick detection method and device for performance of Doppler radar module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114415136A (en) * | 2022-03-29 | 2022-04-29 | 南京气象科技创新研究院 | Method and system for online calibrating echo intensity by continuous wave weather radar |
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2021
- 2021-12-10 CN CN202111505588.2A patent/CN114152924A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114415136A (en) * | 2022-03-29 | 2022-04-29 | 南京气象科技创新研究院 | Method and system for online calibrating echo intensity by continuous wave weather radar |
| CN114415136B (en) * | 2022-03-29 | 2022-06-10 | 南京气象科技创新研究院 | Method and system for online calibrating echo intensity by continuous wave weather radar |
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