CN110568413A - test system and method integrating radar calibration, active transceiving and measurement parameters - Google Patents
test system and method integrating radar calibration, active transceiving and measurement parameters Download PDFInfo
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- CN110568413A CN110568413A CN201910851521.0A CN201910851521A CN110568413A CN 110568413 A CN110568413 A CN 110568413A CN 201910851521 A CN201910851521 A CN 201910851521A CN 110568413 A CN110568413 A CN 110568413A
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- 238000012360 testing method Methods 0.000 title claims abstract description 32
- 238000005259 measurement Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000001228 spectrum Methods 0.000 claims abstract description 16
- 230000005855 radiation Effects 0.000 claims abstract description 10
- 238000013028 emission testing Methods 0.000 claims abstract description 7
- 238000004088 simulation Methods 0.000 claims abstract description 6
- 230000010287 polarization Effects 0.000 claims abstract description 4
- 230000008569 process Effects 0.000 claims description 7
- 239000011358 absorbing material Substances 0.000 claims description 6
- 230000003993 interaction Effects 0.000 claims description 6
- 238000010998 test method Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000001934 delay Effects 0.000 claims description 3
- 230000036544 posture Effects 0.000 claims description 3
- 230000008054 signal transmission Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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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
- 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
- G01S7/4004—Means for monitoring or calibrating of parts of a radar system
- G01S7/4008—Means for monitoring or calibrating of parts of a radar system of transmitters
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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
- G01S7/4004—Means for monitoring or calibrating of parts of a radar system
- G01S7/4021—Means for monitoring or calibrating of parts of a radar system of receivers
Abstract
the invention relates to a test system and a method integrating radar angle calibration, active transceiving and measurement parameters, wherein a reflecting plate is used for converting spherical waves and quasi-plane waves; the DUT turntable is used for controlling the relative angle of the radar to be detected and realizing the simulation of the relative angle; the feed source antenna is arranged on the independent radio frequency module and used for receiving and transmitting radiation signals, and the independent radio frequency module is connected with the radar target simulator; the feed source antenna rotary table is used for polarization switching of the feed source antenna; the radar target simulator is used for simulating the relative distance and the relative speed of the radar; the spectrum analyzer is connected with the radar target simulator and is used for active emission testing; and the signal generator is connected with the radar target simulator and is used for active receiving test. The invention has the advantages that: 1. built in a smaller space. 2. The problem of alignment difficulty under far field condition is solved.
Description
Technical Field
the invention relates to a test system and a method integrating radar angle calibration, active transceiving and parameter measurement.
background
the prior art mainly builds a far-field camera bellows environment, and a test environment main body comprises a shielding camera bellows, a tested object rotary table and a corner reflector for target simulation. The far-field condition (distance between the measured object and the corner reflector) is calculated according to the size of the measured object, and theoretically, the phase of the signal reaching the measured antenna surface can be considered to be consistent only if the far-field condition is infinite. When the maximum phase difference in the antenna aperture is 22.5 degrees, the far field condition iswith frequency of 77GHz as an example, the quilt with different calibersthe far field conditions for the measured object sizes are shown in the table below:
it can be seen that under the same frequency condition, the far field condition increases with the geometric grade of the caliber of the measured object.
The larger the object to be tested is, the farther the required far-field condition is, so that the larger the test field is, and the construction cost of the shielding darkroom is greatly increased. Meanwhile, the farther the far field condition is, the higher the free space loss is, which affects the dynamic range of the test system. And the alignment is also a great problem when testing under far-field conditions, and especially in the case of narrow-beam antennas, the alignment often consumes a lot of manpower and time when the requirement on angular accuracy is high.
the millimeter wave is electromagnetic wave with the wavelength of 1-10mm, the wavelength is short, the frequency band is wide, narrow wave beams are easy to realize, the radar resolution is high, and interference is not easy to occur. Millimeter wave radar is the high accuracy sensor of measuring measured object relative distance, relative velocity, azimuth and angle of pitch, is applied to the military field in early days, and along with the development and the progress of radar technique, millimeter wave radar sensor begins to be applied to a plurality of civilian fields such as car, unmanned aerial vehicle, intelligent transportation, security protection and industry.
For the use of radar, the coverage, distance measurement, speed measurement, angle measurement accuracy and resolution of the radar are often concerned. The quality of these parameters directly affects the actual use of the radar.
In addition, because the frequency of the millimeter wave frequency band is high, the wavelength is short, and the phase change is fast, in the case of 77GHz, the wave path difference changes by 0.1mm, and the phase changes by 9.24 degrees. And the angle measurement of the radar is calculated by detecting the phase difference of the different receiving antennas. The phase difference is affected by PCB process errors and chip phase inconsistency, so that each radar needs to be calibrated in angle before being actually used, and the influence is reduced as much as possible.
for the above test contents, the conventional method is performed in the far-field shielding darkroom mentioned above, but as mentioned above, the construction of the test environment tends to consume more money, time and manpower.
disclosure of Invention
in order to overcome the defects of the prior art, the invention provides a test system and a method integrating radar angle calibration, active transceiving and measurement parameters, and the technical scheme of the invention is as follows: a test system integrating radar calibration, active transceiving and measurement parameters is characterized by comprising
The reflecting plate is used for converting spherical waves and quasi-plane waves;
the DUT turntable is used for controlling the relative angle of the radar to be detected and realizing the simulation of the relative angle;
The feed source antenna is arranged on the independent radio frequency module and used for receiving and transmitting radiation signals, and the independent radio frequency module is connected with the radar target simulator;
the feed source antenna rotary table is used for polarization switching of the feed source antenna;
The radar target simulator is used for simulating the relative distance and the relative speed of the radar;
the spectrum analyzer is connected with the radar target simulator and is used for active emission testing;
the signal generator is connected with the radar target simulator and is used for active receiving test;
The DUT turntable is accessed to the control computer through the turntable controller; the radar target simulator is connected to a control computer;
the reflector, the DUT turntable, the feed source antenna turntable and the independent radio frequency module are all arranged in the shielding darkroom; the radar target simulator, the spectrum analyzer, the signal generator, the rotary table controller and the control computer are all installed outside the shielding darkroom.
the DUT turntable and the reflecting plate are oppositely arranged and are positioned on the same horizontal plane, and the feed source antenna is positioned on the focal point of the reflecting plate.
the control computer is connected with the turntable controller through an RJ45 or USB interface, a control command is issued to the turntable controller through the interface, and the turntable controller controls the DUT turntable according to the command; the tested radar is arranged on the DUT rotary table, and the conversion of various postures of the tested radar is realized by controlling the DUT rotary table; the DUT turntable simultaneously feeds back the state signal to the turntable controller, and the turntable controller feeds back the fed-back state signal to the control computer.
the radar target simulator is connected with the radar target simulator through an RJ45 or USB interface based on a control computer, and issues a control command to the radar target simulator through the interface, so that interaction between the control computer and the radar target simulator is realized; and the radar target simulator performs test signal interaction with the independent radio frequency module, the spectrum analyzer and the signal generator.
a test method integrating radar calibration, active transceiving and measurement parameters comprises the following steps:
(1) A step of active emission testing;
(2) a step of active reception testing;
(3) and testing the transceiving parameters.
The step (1) is specifically as follows:
a. Installing a radar to be tested on a DUT turntable, wherein the radar works in an active transmitting mode;
b. The measured radar radiates signals to all directions, the signals hitting the reflecting plate can be focused to the feed source antenna through the reflecting plate, and the radiation signals in other directions can be absorbed by the wave-absorbing material on the inner surface of the shielded darkroom;
c. after receiving the signal, the feed source antenna transmits the signal to an independent radio frequency module connected with the radar target simulator, and the independent radio frequency module down-converts the high-frequency signal into an intermediate-frequency signal and transmits the intermediate-frequency signal to the radar target simulator;
d. the radar target simulator outputs the received signal to the spectrum analyzer, and the spectrum analyzer outputs a test result;
and e, changing the angle of the DUT turntable to realize the measurement of different angles of the radar.
The step (2) is specifically as follows:
a. installing a radar to be detected on a DUT rotary table, wherein the radar works in an active receiving mode;
b. the signal generator transmits the intermediate frequency signal to the radar target simulator;
c. the radar target simulator transmits the intermediate frequency signal to the independent radio frequency module;
d. The independent radio frequency module converts the signal into a high-frequency signal and transmits the high-frequency signal to the feed source antenna;
e. After the signal is sent out from the feed source antenna, the signal is transmitted to the radar to be detected through the reflecting plate, and the radar processes the signal and outputs a result after receiving the signal;
And f, changing the angle of the DUT turntable to realize the measurement of different angles of the radar.
the step (3) is specifically as follows:
a. installing a radar to be detected on the DUT turntable, wherein the radar works in a normal mode;
b. The measured radar radiates signals to all directions, the signals hitting the reflecting plate can be focused to the feed source antenna through the reflecting plate, and the radiation signals in other directions can be absorbed by the wave-absorbing material on the inner surface of the shielded darkroom;
c. after receiving the signals, the feed source antenna transmits the signals to an independent radio frequency module of the radar target simulator, and the independent radio frequency module converts high-frequency signals into intermediate-frequency signals and transmits the intermediate-frequency signals to the radar target simulator;
d. the radar target simulator delays and Doppler frequency offsets of received signals, and simulates actual distance and speed;
e. The radar target simulator transmits the processed signals to the independent radio frequency module again;
f. The independent radio frequency module up-converts the signal to a high-frequency signal and transmits the high-frequency signal to the feed source antenna;
g. after the signal is sent out again from the feed source antenna, the signal is retransmitted to the radar to be detected through the reflecting plate, and the signal transmission in the whole process is completed;
and h, replacing the radar angle of the DUT turntable to realize measurement of different angles.
the invention has the advantages that:
1. built in a smaller space.
2. the problem of alignment difficulty under far field condition is solved.
3. a higher dynamic range and better far-field test conditions can be obtained.
4. the test of millimeter wave radar active transmission, active reception, angle calibration and system transceiving parameters can be simultaneously met.
drawings
fig. 1 is a schematic view of the main structure of the present invention.
Detailed Description
the invention will be further described with reference to specific embodiments, and the advantages and features of the invention will become apparent as the description proceeds. These examples are illustrative only and do not limit the scope of the present invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications may be made without departing from the spirit and scope of the invention.
referring to fig. 1, the invention relates to a test system integrating radar calibration, active transceiving and measurement parameters, comprising
the reflecting plate 2 is used for converting spherical waves and quasi-plane waves;
The DUT rotary table 6 is used for controlling the relative angle of the radar to be detected and realizing the simulation of the relative angle;
the feed source antenna 3 is arranged on an independent radio frequency module and is used for receiving and transmitting radiation signals, and the independent radio frequency module is connected with the radar target simulator;
a feed antenna turntable (not shown) for switching polarization of the feed antenna;
A radar target simulator 9 for simulation of relative distance and relative velocity of the radar 5;
the spectrum analyzer 10 is connected with the radar target simulator and is used for active emission testing;
The signal generator 11 is connected with the radar target simulator and used for active receiving test;
the DUT turntable 6 is connected with the control computer through a turntable controller 7 (the model is a Mohua industrial personal computer 650); the radar target simulator is connected to a control computer;
The shielding darkroom 1 is characterized in that the reflecting plate, the DUT rotary table, the feed source antenna rotary table and the independent radio frequency module are all arranged in the shielding darkroom; the radar target simulator, the spectrum analyzer, the signal generator, the rotary table controller and the control computer are all installed outside the shielding darkroom.
The DUT turntable and the reflecting plate are oppositely arranged and are positioned on the same horizontal plane, and the feed source antenna is positioned on the focal point of the reflecting plate.
The control computer is connected with the turntable controller through an RJ45 or USB interface, a control command is issued to the turntable controller through the interface, and the turntable controller controls the DUT turntable according to the command; the tested radar is arranged on the DUT rotary table, and the conversion of various postures of the tested radar is realized by controlling the DUT rotary table; the DUT turntable simultaneously feeds back the state signal to the turntable controller, and the turntable controller feeds back the fed-back state signal to the control computer.
the radar target simulator is connected with the radar target simulator through an RJ45 or USB interface based on a control computer, and issues a control command to the radar target simulator through the interface, so that interaction between the control computer and the radar target simulator is realized; and the radar target simulator performs test signal interaction with the independent radio frequency module, the spectrum analyzer and the signal generator.
The invention also relates to a test method integrating radar calibration, active transceiving and parameter measurement, which comprises the following steps:
(1) A step of active emission testing;
(2) a step of active reception testing;
(3) And testing the transceiving parameters.
The step (1) is specifically as follows:
a. installing a radar to be tested on a DUT turntable, wherein the radar works in an active transmitting mode;
b. The measured radar radiates signals to all directions, the signals hitting the reflecting plate can be focused to the feed source antenna through the reflecting plate, and the radiation signals in other directions can be absorbed by the wave-absorbing material on the inner surface of the shielded darkroom;
c. after receiving the signal, the feed source antenna transmits the signal to an independent radio frequency module connected with the radar target simulator, and the independent radio frequency module down-converts the high-frequency signal into an intermediate-frequency signal and transmits the intermediate-frequency signal to the radar target simulator;
d. the radar target simulator outputs the received signal to the spectrum analyzer, and the spectrum analyzer outputs a test result;
And e, changing the angle of the DUT turntable to realize the measurement of different angles of the radar.
The step (2) is specifically as follows:
a. Installing a radar to be detected on a DUT rotary table, wherein the radar works in an active receiving mode;
b. The signal generator transmits the intermediate frequency signal to the radar target simulator;
c. the radar target simulator transmits the intermediate frequency signal to the independent radio frequency module;
d. the independent radio frequency module converts the signal into a high-frequency signal and transmits the high-frequency signal to the feed source antenna;
e. After the signal is sent out from the feed source antenna, the signal is transmitted to the radar to be detected through the reflecting plate, and the radar processes the signal and outputs a result after receiving the signal;
and f, changing the angle of the DUT turntable to realize the measurement of different angles of the radar.
The step (3) is specifically as follows:
a. Installing a radar to be detected on the DUT turntable, wherein the radar works in a normal mode;
b. the measured radar radiates signals to all directions, the signals hitting the reflecting plate can be focused to the feed source antenna through the reflecting plate, and the radiation signals in other directions can be absorbed by the wave-absorbing material on the inner surface of the shielded darkroom;
c. After receiving the signals, the feed source antenna transmits the signals to an independent radio frequency module of the radar target simulator, and the independent radio frequency module converts high-frequency signals into intermediate-frequency signals and transmits the intermediate-frequency signals to the radar target simulator;
d. The radar target simulator delays and Doppler frequency offsets of received signals, and simulates actual distance and speed;
e. the radar target simulator transmits the processed signals to the independent radio frequency module again;
f. The independent radio frequency module up-converts the signal to a high-frequency signal and transmits the high-frequency signal to the feed source antenna;
g. after the signal is sent out again from the feed source antenna, the signal is retransmitted to the radar to be detected through the reflecting plate, and the signal transmission in the whole process is completed;
And h, replacing the radar angle of the DUT turntable to realize measurement of different angles.
Claims (8)
1. a test system integrating radar calibration, active transceiving and measurement parameters is characterized by comprising
The reflecting plate is used for converting spherical waves and quasi-plane waves;
the DUT turntable is used for controlling the relative angle of the radar to be detected and realizing the simulation of the relative angle;
the feed source antenna is arranged on the independent radio frequency module and used for receiving and transmitting radiation signals, and the independent radio frequency module is connected with the radar target simulator;
the feed source antenna rotary table is used for polarization switching of the feed source antenna;
The radar target simulator is used for simulating the relative distance and the relative speed of the radar;
the spectrum analyzer is connected with the radar target simulator and is used for active emission testing;
the signal generator is connected with the radar target simulator and is used for active receiving test;
the DUT turntable is accessed to the control computer through the turntable controller; the radar target simulator is connected to a control computer;
the reflector, the DUT turntable, the feed source antenna turntable and the independent radio frequency module are all arranged in the shielding darkroom; the radar target simulator, the spectrum analyzer, the signal generator, the rotary table controller and the control computer are all installed outside the shielding darkroom.
2. The system of claim 1, wherein the DUT turret and the reflector plate are disposed opposite to each other and on the same horizontal plane, and the feed antenna is located at the focal point of the reflector plate.
3. The system of claim 1 or 2, wherein the control computer is connected to the turntable controller via an RJ45 or USB interface, and issues control commands to the turntable controller via the interface, and the turntable controller controls the DUT turntable according to the commands; the tested radar is arranged on the DUT rotary table, and the conversion of various postures of the tested radar is realized by controlling the DUT rotary table; the DUT turntable simultaneously feeds back the state signal to the turntable controller, and the turntable controller feeds back the fed-back state signal to the control computer.
4. the system of claim 1 or 2, wherein the radar target simulator is connected to the radar target simulator through an RJ45 or USB interface based on a control computer, and issues a control command to the radar target simulator through the interface to realize interaction between the control computer and the radar target simulator; and the radar target simulator performs test signal interaction with the independent radio frequency module, the spectrum analyzer and the signal generator.
5. a test method integrating radar calibration, active transceiving and parameter measurement is characterized by comprising the following steps:
(1) a step of active emission testing;
(2) a step of active reception testing;
(3) and testing the transceiving parameters.
6. The integrated test method for radar calibration, active transceiving and measurement parameters according to claim 5, wherein the step (1) specifically comprises:
a. installing a radar to be tested on a DUT turntable, wherein the radar works in an active transmitting mode;
b. the measured radar radiates signals to all directions, the signals hitting the reflecting plate can be focused to the feed source antenna through the reflecting plate, and the radiation signals in other directions can be absorbed by the wave-absorbing material on the inner surface of the shielded darkroom;
c. After receiving the signal, the feed source antenna transmits the signal to an independent radio frequency module connected with the radar target simulator, and the independent radio frequency module down-converts the high-frequency signal into an intermediate-frequency signal and transmits the intermediate-frequency signal to the radar target simulator;
d. the radar target simulator outputs the received signal to the spectrum analyzer, and the spectrum analyzer outputs a test result;
and e, changing the angle of the DUT turntable to realize the measurement of different angles of the radar.
7. the integrated test method for radar calibration, active transceiving and measurement parameters according to claim 5, wherein the step (2) specifically comprises:
a. installing a radar to be detected on a DUT rotary table, wherein the radar works in an active receiving mode;
b. the signal generator transmits the intermediate frequency signal to the radar target simulator;
c. the radar target simulator transmits the intermediate frequency signal to the independent radio frequency module;
d. the independent radio frequency module converts the signal into a high-frequency signal and transmits the high-frequency signal to the feed source antenna;
e. after the signal is sent out from the feed source antenna, the signal is transmitted to the radar to be detected through the reflecting plate, and the radar processes the signal and outputs a result after receiving the signal;
and f, changing the angle of the DUT turntable to realize the measurement of different angles of the radar.
8. The integrated test method for radar calibration, active transceiving and measurement parameters according to claim 5, wherein the step (3) specifically comprises:
a. installing a radar to be detected on the DUT turntable, wherein the radar works in a normal mode;
b. the measured radar radiates signals to all directions, the signals hitting the reflecting plate can be focused to the feed source antenna through the reflecting plate, and the radiation signals in other directions can be absorbed by the wave-absorbing material on the inner surface of the shielded darkroom;
c. after receiving the signals, the feed source antenna transmits the signals to an independent radio frequency module of the radar target simulator, and the independent radio frequency module converts high-frequency signals into intermediate-frequency signals and transmits the intermediate-frequency signals to the radar target simulator;
d. The radar target simulator delays and Doppler frequency offsets of received signals, and simulates actual distance and speed;
e. The radar target simulator transmits the processed signals to the independent radio frequency module again;
f. the independent radio frequency module up-converts the signal to a high-frequency signal and transmits the high-frequency signal to the feed source antenna;
g. after the signal is sent out again from the feed source antenna, the signal is retransmitted to the radar to be detected through the reflecting plate, and the signal transmission in the whole process is completed;
and h, replacing the radar angle of the DUT turntable to realize measurement of different angles.
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Application publication date: 20191213 |