CN109581307B - Echo intensity Z parameter calibration method and device, computer equipment and storage medium - Google Patents
Echo intensity Z parameter calibration method and device, computer equipment and storage medium Download PDFInfo
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- CN109581307B CN109581307B CN201811398625.2A CN201811398625A CN109581307B CN 109581307 B CN109581307 B CN 109581307B CN 201811398625 A CN201811398625 A CN 201811398625A CN 109581307 B CN109581307 B CN 109581307B
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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
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
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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
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
- G01S7/4082—Means for monitoring or calibrating by simulation of echoes using externally generated reference signals, e.g. via remote reflector or transponder
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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Abstract
The invention relates to an echo intensity Z parameter calibration method, a device, computer equipment and a storage medium, wherein the method comprises the steps of selecting a standard metal ball, enabling the standard metal ball to move at a high speed along the radial direction of a radar through ground erection to form a Doppler echo, and detecting the echo amplitude of the standard metal ball; acquiring the radial movement speed of a standard metal ball; calculating a Z parameter corresponding to a distance library in which the standard metal ball is located according to the acquired parameters of the radar and the parameters of the standard metal ball; carrying out simulated target transmitting power processing according to the distance library where the standard metal ball is located; calibrating the full-distance measuring range by using the simulation target; calculating the echo intensity Z parameter correction value of each distance library for each calibrated distance library; establishing a correction parameter table according to the echo intensity Z parameter correction value of each distance library; when the radar echo intensity calibration value is used, the radar measured value is corrected by using the correction parameter table so as to obtain the echo intensity Z parameter calibration value. The invention realizes the improvement of the precision and the accuracy of the calibration.
Description
Technical Field
The invention relates to the technical field of radar, in particular to a method and a device for calibrating an echo intensity Z parameter, computer equipment and a storage medium.
Background
The strong convection weather forecast early warning is an important task for weather disaster prevention and reduction, and is sudden, rapid in movement, severe in change and extremely strong in destructive power, and often accompanied by severe weather such as lightning thunder, wind heavy rain and the like, so that houses are knocked down, crops and trees are destroyed, telecommunication traffic is damaged, even casualties are caused. The advanced numerical prediction mode is gradually used, the Doppler weather radar network is gradually improved, and the optimal prediction means and method are provided for the short-term prediction of strong convection weather.
The echo intensity Z parameter is one of the core parameters of the weather radar, the measurement error comprises a system error and a fluctuation error, the system error is the mean value of error samples, the fluctuation error is the root mean square value obtained by subtracting the mean value from the error samples, the error samples are the measured value minus the true value, most radars equivalently obtain the true value in an analog mode due to the lack of true value measurement equipment, obtain the error samples, calculate the root mean square error and use the true value as the precision. If the system error is not accurately calibrated, the accuracy or the accuracy is not guaranteed, but if the system error can be measured by using a true value and corrected, the accuracy is equal to the accuracy, so that the radar measurement system error is calibrated by providing an objective target true value to form a system error correction table, and the correction of a target parameter in radar detection is the main content of Z parameter calibration.
At present, Z parameter calibration methods proposed at home and abroad are about four types, namely satellite calibration, unmanned aerial vehicle calibration, airborne balloon calibration and receiver injection simulation target calibration. The satellite calibration is characterized in that the satellite calibration is far away, the distribution states of atmospheric components, cloud fog and the like are uncertain, the calculation error of atmospheric propagation loss can reach more than 1dB, the calibration precision is at least three times of the precision of measurement parameters according to a true value, the measurement precision is usually 1dB, the calibration precision does not meet the requirement of radar on the target measurement precision, meanwhile, the beam shape loss caused by beam shape weighting can be caused by the relative motion between a radar beam and a satellite calibration antenna beam in the calibration state, and can reach 3dB, the calibration method is a subjective signal amplitude method rather than an objective target detection method, namely, the calibration is carried out by radiating and injecting standard signal amplitude into each radar, no real target objective reference exists, and the calibration precision and the calibration accuracy are not high; the unmanned aerial vehicle calibration method is similar to the satellite calibration method, is a subjective signal amplitude calibration method, but the unmanned aerial vehicle still has platform stability errors and also has antenna beam waveform loss errors when the radar scans and tracks the unmanned aerial vehicle; the airborne balloon adopts an angle reflector or a standard metal sphere, and belongs to an objective target method compared with the method, namely, the standard target is measured and calibrated, the standard target is an objective reflector and has the same characteristics for all radars, but the airborne balloon flutters with the wind and is unstable in position, the radar is difficult to ensure the detection in the direction of the maximum value of an antenna beam when detecting the balloon, the wave form loss of the antenna beam is large, the maximum possibility exceeds 3dB, and the requirement of the radar on the target measurement precision is not met; the calibration of the receiver injected simulation target is the most applied calibration method at present, all weather radars must design the built-in echo intensity calibration method of the simulation target injected from the receiver according to the regulations, the method can only calibrate the intensity measurement consistency of different distance libraries of the radar, a simulation target injection power for calculating equivalent intensity is provided for built-in calibration, but the measurement accuracy of the objective target cannot be guaranteed, and according to the current statistical condition, when all radars adopting the simulation target receiver to inject the calibration are used, the difference of the detection intensity of adjacent radar stations in the same area is more than 10dB at most.
Therefore, it is necessary to design a new method to improve the precision and accuracy of calibration.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an echo intensity Z parameter calibration method, an echo intensity Z parameter calibration device, computer equipment and a storage medium.
In a first aspect, an embodiment of the present invention provides a method for calibrating an echo intensity Z parameter, including:
selecting a standard metal ball, and erecting the standard metal ball on the ground to enable the standard metal ball to move at a high speed along the radial direction of the radar so as to form a Doppler echo;
detecting the echo amplitude of the standard metal ball by using Doppler echo;
acquiring the radial movement speed of a standard metal ball;
acquiring parameters of a radar and parameters of a standard metal ball;
calculating a Z parameter corresponding to a distance library in which the standard metal ball is located according to the parameter of the radar and the parameter of the standard metal ball to obtain an echo intensity Z parameter calibration value of the distance library in which the standard metal ball is located;
carrying out simulated target transmitting power processing according to a distance library where the standard metal ball is located to obtain simulated target signal transmitting power of the equivalent standard metal ball of the erection point;
calibrating the full-distance measuring range by using the simulation target;
calculating the echo intensity Z parameter correction value of each distance library for each calibrated distance library;
establishing a correction parameter table according to the echo intensity Z parameter correction value of each distance library;
when the radar echo intensity calibration value is used, the radar measured value is corrected by using the correction parameter table so as to obtain the echo intensity Z parameter calibration value.
In a second aspect, the embodiment of the present invention further provides an echo intensity Z parameter calibration apparatus, which includes a unit for performing the above method.
In a third aspect, an embodiment of the present invention further provides a computer device, which includes a memory and a processor, where the memory stores a computer program, and the processor implements the above method when executing the computer program.
In a fourth aspect, the present invention also provides a computer-readable storage medium, where a computer program is stored, where the computer program includes program instructions, and the program instructions, when executed by a processor, can implement the method described above.
Compared with the prior art, the invention has the beneficial effects that: the method includes erecting standard metal balls moving along the radial direction of a radar at a high speed on the ground, correspondingly simulating target output amplitude through the standard metal balls, calculating the standard metal ball simulation target amplitude from distance base to distance base along the radial distance direction of the radar, realizing radar echo intensity Z parameter calibration, forming a correction parameter table according to Z parameter measurement system error combinations obtained from each distance base, and correcting each radar measured value in actual application by using the correction parameter table to improve calibration precision and accuracy.
The invention is further described below with reference to the accompanying drawings and specific embodiments.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic view of an application scenario of an echo intensity Z parameter calibration method provided in an embodiment of the present invention;
fig. 2 is a schematic flowchart of a calibration method for an echo intensity Z parameter according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a calibration instrument provided in an embodiment of the present invention;
fig. 4 is a schematic diagram of an explosive structure of the calibration instrument provided in the embodiment of the present invention;
FIG. 5 is a diagram illustrating Doppler filtering according to an embodiment of the present invention;
FIG. 6 is a graph of the relationship between the RCS and the radius of a standard metal ball according to an embodiment of the present invention;
FIG. 7 is a schematic block diagram of an echo intensity Z parameter calibration apparatus provided in an embodiment of the present invention;
fig. 8 is a schematic block diagram of a computer device provided in an embodiment of the present invention.
Detailed Description
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.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic view of an application scenario of an echo intensity Z parameter calibration method according to an embodiment of the present invention. Fig. 2 is a schematic flow chart of an echo intensity Z parameter calibration method according to an embodiment of the present invention. The echo intensity Z parameter calibration method is applied to a server. The server can be one server in a distributed service platform, a calibration platform is deployed in the server, and the radar measurement value is sent to the server, so that the server can correct the radar measurement value.
It should be noted that fig. 2 only illustrates one server, and in the actual operation process, a plurality of servers may perform correction of a plurality of radar measurement values at the same time.
Fig. 2 is a schematic flow chart of a method for calibrating an echo intensity Z parameter according to an embodiment of the present invention. As shown in fig. 2, the method includes the following steps S110 to S200.
S110, selecting the standard metal ball 50, and enabling the standard metal ball 50 to move at a high speed along the radial direction of the radar through ground erection to form a Doppler echo.
The diameter of the standard metal ball 50 is the minimum diameter of the standard metal ball 50 for calibration, and a standard metal ball 50 smaller than the minimum diameter cannot be used for calibration, and since the electromagnetic wave reflection characteristics are divided into a rayleigh region, a resonance region and an optical region, only the optical region can be accurately calibrated. The standard metal ball 50 is selected according to the radar working wavelength to be calibrated, RCS partition conditions of the radar on the target are detected, and the diameter of the standard metal ball 50 is calculated according to the optical area starting conditions and 3-time redundancy.
The standard metal ball 50 is selected according to the radar working wavelength to be calibrated, and the diameter of the metal ball is calculated according to the RCS partition condition of the radar on target detection. Due to perfect radial symmetry, an ideal conductor sphere is the simplest scatterer in all three-dimensional structures, the geometrical shape is simple, echo does not change along with orientation, but RCS obviously changes along with electrical size, and RCS is divided into RayleighZone, resonance zone and optical zone, as shown in FIGS. 5 and 6, the parameter ka being the circumference of the sphere in terms of wavelength, then
a is the radius of the sphere and lambda is the working wavelength; when ka is more than or equal to 0 and less than or equal to 1, RCS is in a Rayleigh region and rapidly increases along with the increase of ka; when ka is more than or equal to 1 and less than or equal to 10, the size of RCS in a resonance area is changed violently, and the resonance amplitude is converged gradually along with the increase of ka; when ka ≧ 10, RCS stability increases with ka, and considering triple design redundancy, taking ka as 30, the metal sphere radius is
For S-band radar, a is not less than 48cm, C-band radar, a is not less than 26cm, X-band radar, a is not less than 15cm.
Specifically, referring to fig. 3 and 4, a doppler echo is formed by a calibration instrument, the calibration instrument includes a ground frame and a standard metal ball 50, the ground frame includes a leveling frame 30, a leveling structure, a mounting chassis 20 and a sliding structure, the leveling structure is connected to the leveling frame 30, the mounting chassis 20 is connected above the leveling frame 30, the standard metal ball 50 and the mounting chassis 20 move through the sliding structure, and the sliding structure is mounted at a position such that the standard metal ball 50 moves at a high speed in a radar radial direction; the calibration instrument further comprises a first calibration antenna 60 and a second calibration antenna 70, wherein the first calibration antenna 60 and the second calibration antenna 70 are respectively connected with the mounting chassis 20 through a rotating structure, the first calibration antenna 60 and the second calibration antenna 70 are respectively located on two sides of the standard metal ball 50, and when the standard metal ball 50 does high-speed reciprocating motion along the slide rail 51, the first calibration antenna 60 and the second calibration antenna 70 do not work; the standard metal ball 50 is stationary and the first calibration antenna 60 and the second calibration antenna 70 rotate perpendicular to the mounting chassis 20.
The sliding structure includes a sliding rail 51 located on the mounting base plate 20, a sliding block 52 connected to the standard metal ball 50, and a power source connected to the sliding block 52, wherein the sliding block 52 is connected to the sliding rail 51, and the power source includes, but is not limited to, a servo motor 74.
The rotating structure comprises a motor 74, a transmission structure, two supports, an antenna mounting plate 71 and an encoder 75, wherein the motor 74 is connected with the mounting base plate 20, the two supports are connected with the mounting base plate 20, the motor 74 is connected with the transmission structure, the transmission structure is connected with the antenna mounting plate 71, the antenna mounting plate 71 is connected with the encoder 75 through a rotating shaft, the rotating shaft penetrates through one of the supports, the transmission structure comprises a master gear 73 and a slave gear 72, the master gear 73 is connected with an electrode, the slave gear 72 is connected with the antenna mounting plate 71 through the rotating shaft, the first calibration antenna 60 and the second calibration antenna 70 are respectively positioned on the antenna mounting plate 71, the master gear 73 is driven to rotate by the motor 74, the slave gear 73 drives the slave gear 72 to rotate, the slave gear 72 drives the antenna mounting plate 71 to rotate through the rotating shaft, and the rotation angle of the antenna mounting plate 71 is detected by the encoder 75. The rotation process for both the first calibration antenna 60 and the second calibration antenna 70 is identical to the above process. The motor 74 is fixedly attached to the mounting plate 20 by a mounting bracket 76.
The mounting base plate 20 is provided with a support, the power source is connected to the support, and the support is further provided with a receiving horn antenna.
The leveling structure comprises a plurality of leveling feet, the leveling feet comprise telescopic pillars 42 and supporting components located at two ends of the telescopic pillars 42, each adjusting component comprises a supporting disk 41 and a plurality of adjusting screws, the supporting disks 41 are connected with the telescopic pillars 42 through the adjusting screws, and the leveling degree of the supporting disks 41 is realized by adjusting the tightness of the adjusting screws.
The number of the leveling feet is 3, and the leveling degree of the supporting plate 41 is realized through the 3 leveling feet which are arranged in a triangular mode.
The calibration instrument further comprises a radome 10, wherein the radome 10 is located on the mounting chassis 20, and the first calibration antenna 60, the second calibration antenna 70 and the standard metal ball 50 are located inside the radome 10.
And selecting a proper diameter of the standard metal ball 50 to enable the radar to work in the optical area, so that the reflecting area is stable when the radar detects the standard metal ball 50, and the calculated echo intensity Z parameter is stable.
And S120, detecting the echo amplitude of the standard metal ball 50 by using Doppler echo.
The calibration method is based on a ground erection method for the standard metal ball 50 moving at a high speed along the radial direction of the radar, the standard metal ball 50 is fixedly erected on the ground, so that the radar can be aligned to a detected object, the loss of the antenna beam shape is eliminated, the influence of the ground clutter on an echo is eliminated by high-speed movement, the influence of the ground clutter is eliminated by using radar Doppler filtering, and the echo amplitude of the standard metal ball 50 is effectively detected.
And S130, acquiring the radial movement speed of the standard metal ball 50.
Specifically, 2-time redundancy is adopted according to the minimum Doppler velocity detected by the radar, the linear velocity of the standard metal ball 50 is designed, 2-time redundancy is adopted according to the period of the CPI detected by the radar, and the length of the moving path of the standard metal ball 50 is designed.
The calculation of the radial movement speed of the standard metal ball 50 is based on the radar working parameters, and the Doppler modulation frequency generated by the movement speed of the standard metal ball 50 in the radar echo is 3 times higher than the radar Doppler frequency resolution bandwidth.
The Doppler modulation frequency generated by the movement speed of the standard metal ball 50 in the radar echo is
v d The radial movement speed of the standard metal ball 50 relative to the radar is positive, the movement speed of the standard metal ball 50 towards the radar is positive, the doppler frequency is positive, the deviation movement speed is negative, and the doppler frequency is negative.
The detection resolution of the radar to the Doppler frequency depends on the radar working parameters, and when the radar is in full-coherent operation, the bandwidth of a radar Doppler filter is
N is the number of FFT points or the number of coherent accumulated pulses, T r The pulse repetition period is detected.
The radar filters ground clutter through a Doppler filter, detects the echo of a standard metal ball 50, and considers the design redundancy of 3 times, wherein the target motion speed corresponds to the Doppler frequency f d Not less than 3 delta f, the minimum moving speed of the standard metal ball 50 is
Taking the X wave band as an example, the lambda is 3.2cm, the N is 64 r Take 1000 μ s, then v d Is + -0.75 m/s. Taking the C wave band as an example, taking lambda as 5.5cm, taking N as 64 r Take 1000 μ s, then v d Is +/-1.3 m/s. For example, in the S band, λ is 10cm, N is 64, T is r Take 1000 μ s, then v d Is + -2.3 m/s. Taking L band as an example, the lambda is 30cm, the N is 64 r Take 1000 μ s, then v d Is + -9.4 m/s.
The purpose of calculating the radial movement speed of the standard metal ball 50 is to determine the minimum movement speed, so that the standard metal ball 50 can be detected by a radar, the reflected echo of the standard metal ball 50 is submerged by ground clutter when the standard metal ball is stationary, the radar can detect a ground moving target through Doppler filtering, namely, the ground clutter is filtered by using Doppler frequency shift of the moving target, the moving target is detected, and the radar detection performance can be calibrated by using the standard echo intensity of the standard metal ball 50 only when the standard metal ball 50 is detected.
And S140, acquiring parameters of the radar and parameters of the standard metal ball 50.
In this embodiment, the parameters of the radar include a radar wavelength, a radar distance, a radar antenna azimuth beam width, and a radar antenna elevation beam width; the parameters of the standard metal ball 50 include the metal ball radius. When calibrating a known radar, the radar wavelength, the radar antenna azimuth beam width and the pitch beam width are known, the radar distance refers to the detection distance of the radar to the standard metal ball 50, and the radar distance refers to the distance between the standard metal ball 50 and the radar when the radar detects the standard metal ball 50 and is obtained through double-difference GPS measurement.
S150, calculating a Z parameter corresponding to the distance library in which the standard metal ball 50 is located according to the parameters of the radar and the parameters of the standard metal ball 50 to obtain a calibrated value of the Z parameter of the echo intensity of the distance library in which the standard metal ball 50 is located.
In this embodiment, the calibrated value of the callback strength Z parameter of the distance library where the standard metal ball 50 is located is the true value of the radar reflectivity coefficient.
In one embodiment, the step S150 may include steps S151 to S153.
S151, calculating a standard echo intensity Z parameter of a distance library where the standard metal ball 50 is located according to the distance between the metal ball and the radar parameter;
s152, subtracting the standard echo intensity Z parameter of the corresponding distance library from the parameter of the radar to form a distance library error sample in which the standard metal ball 50 is located;
s153, calculating an error sample mean value according to the error sample of the distance library where the standard metal ball 50 is located, so as to obtain a parameter calibration value of the echo intensity Z of the distance library where the standard metal ball 50 is located.
According to the meteorological radar equation of
Wherein, P r G is the radar antenna gain, theta is the radar antenna azimuth beam width,
the pitch beam width of the radar antenna, c is the speed of light, r is the target distance, tau is the width of the transmitted pulse, | K 2 Is constant, and the | K- 2 About 0.93, zero incidence of | K 2 And the value is approximately equal to 0.2, Z is the radar reflectivity coefficient, and lambda is the radar working wavelength.
Wherein the content of the first and second substances,
beta is a constant dependent on radar system parameters, r is the radial distance of the target from the radar, and σ is the radar target cross-sectional area RCS. σ = η V, η being the radar reflectivity in units of target cross-sectional area per unit volume, V being the volume sampled by the radar,
n is the number of scattering elements per unit volume, σ i Is the backscattering cross-sectional area of the ith scatterer.
In the formula | K ∞ 2 Is constant, and the | K | (R) counts when the particles are in the water state at the temperature of 0-20 DEG C 2 About 0.93, | K shadingin ice state 2 ≈0.2，D i For the ith particle diameter, radar reflectance coefficient:
since millimeter is usually used as the diameter D of the water drop i 1m should be considered 3 The sum occurring per unit volume, and therefore typically Z, is in mm 6 /m 3 . For ice particles, di is the diameter of the water droplet when the ice particles are completely melted into water droplets.
In addition, the first and second substrates are,
the radar cross-sectional area RCS, expressed as σ, is equivalent to the projected area of a standard metal sphere 50 with an equal echo: σ = π a 2 (ii) a The true value of the radar reflectivity coefficient is:
namely, the echo intensity Z parameter calibration value of the distance library where the standard metal ball 50 is positioned is
The calibration value of the echo intensity Z parameter of the distance library where the standard metal ball 50 is located is in direct proportion to the radius of the standard metal ball 50 and the radar wavelength and in inverse proportion to the product of the azimuth beam width, the pitch beam width, the radar distance and the radar pulse width of the radar antenna.
And S160, performing simulated target transmitting power processing according to the distance library where the standard metal ball 50 is located to obtain simulated target signal transmitting power of the erection point equivalent standard metal ball 50.
The power of the standard metal ball 50 received by the radar is counted each time, the actual value of the radar when the simulated target transmitting power is transmitted is counted according to theory, the simulated target power received by the radar is counted, the difference value of the average power counted by the simulated target and the average power counted by the standard metal ball 50 is calculated and used as a calibration parameter, the originally set simulated target transmitting power is calibrated, and the simulated target signal transmitting power of the erection point equivalent standard metal ball 50 is obtained.
In one embodiment, the step S160 may include steps S161 to S166.
S161, obtaining the echo signal power of the standard metal ball 50 received by the radar;
s162, calculating the corresponding simulated target transmitting power of the standard metal ball 50;
s163, replacing the standard metal ball 50 with the simulation target to transmit a simulation target signal to the radar;
s164, adjusting the transmitting power of the simulated target to enable the transmitting power of the target to be equal to the echo amplitude of the standard metal ball 50;
s165, reading a radar signal processing result;
and S166, adjusting the transmitting power of the simulated target according to the radar signal processing result to obtain the transmitting power of the simulated target signal of the erection point equivalent standard metal ball 50.
Specifically, the calculation is performed according to the radar equation, the conversion is performed to the simulated target transmitting power, and the radar measurement adjustment is performed to obtain the simulated target signal transmitting power of the erection point equivalent standard metal ball 50.
Transmitting simulated target signal power P to radar from the position of standard metal ball 50 a Analog target transmit antenna gain G a Effective aperture area of radar antenna is A e The radar receives the insertion loss L of the feeder line, the parameters are all given by a calibrated radar, and the amplitude P of a simulated target received by the radar ra ：
The standard metal ball 50 has a receiving signal power P corresponding to radar r The simulated target is made to transmit corresponding to the receiving power P of the radar receiver by correction ra ＝P r Then the simulated target amplitude is equal to the standard metal ball 50 radar echo amplitude and the standard metal ball 50 can be replaced with the simulated target.
Calculating the corresponding simulated target transmitting power of the standard metal ball 50 as follows:
and transmitting a simulation target signal to the radar according to the power setting, counting and measuring the deviation of the simulation target, and correcting the calculated value to obtain accurate simulation target transmitting power during each calibration.
The actually measured average power of the simulated target signal emitted by the radar for N times is as follows:
the average power of the radar receiving simulation target signal is as follows:
the average power of the radar receiving metal ball signal is as follows:
calculating a correction error: delta pa ＝P a -P r ；
The simulated target transmitting power adjusted according to the correction error is as follows: p a0 ＝P a -δ pa 。
And S170, calibrating the full-distance measuring range by using the simulation target.
In this embodiment, the full range refers to all range bins within the range of the radar.
Specifically, the simulated target transmitting power corresponding to the standard metal ball 50 is calculated along the radar radial distance direction by the distance library.
Simulating the transmitting power of a target according to the distance library where the standard metal ball 50 is located, calculating the transmitting power of the simulated target according to the distance ratio square by the distance library, equivalent the echo power of the standard metal ball 50 of the distance library, and calculating the Z parameter true value of the distance library.
Because the erection point of the standard metal ball 50 cannot cover the full-distance range, the full-distance range is calibrated by using the emission simulation target, the emission power of the simulation target on the distance library where the erection point of the standard metal ball 50 is located is calculated and measured according to the calibration mode of the step S160, so that the emission power of the simulation target is equal to the echo amplitude of the standard metal ball 50, and other distance libraries are calculated according to the corrected emission power of the simulation target by the same method.
And S180, calculating the echo intensity Z parameter correction value of each distance library for each calibrated distance library.
And acquiring the echo intensity Z parameter correction value of each distance library so as to establish a correction parameter table and ensure the accuracy of the radar measurement parameters.
In one embodiment, the step S180 may include steps S181 to S183.
S181, obtaining a true value of a reflectivity coefficient of each distance bin by emitting a simulated target signal calibrated by the standard metal ball 50;
and S182, reading radar measurement results of each distance library and simulated target transmitting power monitoring results.
In this embodiment, the radar measurement result of each range bin includes an output reflectance coefficient and a true reflectance coefficient value; the monitoring result of the simulated target transmitting power comprises a simulated target transmitting power average value, a simulated target transmitting power correction coefficient and echo intensity Z parameter deviation caused by the correction coefficient
And S183, calculating the reflectivity coefficient measurement system error according to the read radar measurement result of each range bank and the simulation target transmitting power monitoring result to obtain the echo intensity Z parameter correction value of each range bank.
And obtaining the sum of the deviation of the echo intensity Z parameter caused by the correction coefficient of the simulated target transmitting power and the deviation of the radar output reflectivity coefficient and the reflectivity coefficient true value to form the echo intensity Z parameter correction value of each distance library.
Specifically, the corrected erection point simulation target transmitting power is set to be P a0 Corresponding to the simulated target power received by the radar as P ra0 Distance r between the metal ball mounting point and the radar a From the radar equation:
simulation of target transmitting power P by jth distance bin j0 (ii) a The power of the simulated target received by the corresponding radar is P rj0 (ii) a Then
Further obtain
It indicates that the target transmitting power P is simulated by the jth range bin rj0 Transmitting a simulated target signal to the radar, wherein the amplitude of the simulated target signal is equal to that of a signal received by the high-speed motion radar of the standard metal ball 50 in the jth range bin, and transmitting P rj0 And realizing the intensity calibration of the jth distance library. And calculating a true value of the radar reflectivity coefficient of the jth range bin as follows:
and obtaining the real value of the transmitting power and the reflectivity coefficient of the simulated target of each distance bin according to the mode.
And (3) transmitting a simulated target signal to the radar by each distance bank according to the obtained true value of the simulated target transmitting power and the reflectivity coefficient of each distance bank, and correcting the simulated target power which is actually transmitted by monitoring the actual simulated target transmitting power because an actual parameter of the simulated target transmitting power which is set each time has an error with a set parameter. The radar quantifies the minimum unit of the distance detection as the length of a distance bank, the length of one distance bank is different from that of the other radar, the length of the distance bank depends on the bandwidth of a radar signal, the length of the 1Mhz bandwidth distance bank is 150m, for example, the maximum detection distance of the radar is 400Km, and 2666 distance banks are provided, and the detection distance of the radar is represented by the number of the distance banks. Because the intensity parameters of the same standard metal ball 50 in different distance bins are different, the transmitting power of the equivalent simulation target is calculated according to a formula, the equivalent simulation target is transmitted to the radar, the measured intensity of the radar is read out, and the distance bins are calculated and calibrated.
Taking the jth range bin as an example, the jth range bin is set to simulate the target transmitting power P j And obtaining the average value of the simulated target transmitting power through k times of transmission:
the simulation target transmitting power correction coefficient is as follows:
echo intensity deviation by correction factor: delta. For the preparation of a coating j0 ＝10logK j 。
The calibration instrument transmits a simulation target signal to the radar, and the radar receives the simulation target signal and outputs a reflectivity coefficient Z j True value of reflectance coefficient of Z j0 Counting the N times of measurement results to obtain the deviation delta between the measured reflectivity coefficient and the true value of the jth distance library zj1 . The Z parameter measurement deviation of the jth distance library is:
wherein Z is jk And the reflectivity coefficient output for the kth measurement of the jth distance bank. The Z parameter measurement system error of the jth range bin is the sum of the measurement deviation caused by the simulated target transmitting power and the deviation of the radar output measured value and the true value, namely delta zj ＝δ zj0 +δ zj1 (ii) a According to the mode, a Z parameter system error table, namely a correction parameter table, is obtained by calibrating the distance bins one by one and is stored in the display control terminal, when the radar outputs the measurement parameters, the table is looked up and the system error is subtracted, the calibrated measurement parameters are obtained, and the jth distance bin outputs Z parameters as follows: z j1 ＝Z j -δ zj 。
S190, establishing a correction parameter table according to the echo intensity Z parameter correction value of each distance library;
and forming a correction parameter table according to all the acquired Z parameter measurement system errors, and correcting each radar measurement value in actual application by using the correction parameter table.
S200, correcting the radar measured value by using the correction parameter table to obtain the echo intensity Z parameter calibration value.
And monitoring the emission power of the simulated target and the radar receiving measurement Z parameter in real time to form a simulated target emission power system error and a radar measurement system error, comprehensively forming an error sample mean value to obtain a system error correction table, and subtracting the system error when the radar is measured to realize Z parameter calibration.
The method is based on a ground-based standard metal ball 50 calibration method which moves along the radial direction of a radar at a high speed, the ground is fixedly provided with the standard metal ball 50 to enable the radar to be aligned to a detected object, the antenna beam shape loss is eliminated, the high-speed movement enables echoes to be separated from ground clutter, the ground clutter influence is eliminated by utilizing the radar Doppler filtering function, and the standard metal ball 50 is effectively detected, so that the method belongs to an objective target calibration method, different radar detection performances are scientifically calibrated by utilizing standard objective objects, the selected standard metal ball 50 has isotropic reflection performance, and the method is an international universal radar reflection area standard reference object. The military and civil integration market also needs a calibration instrument capable of executing a quick calibration task, a target identification technology based on RCS measurement needs to calibrate the RCS measurement performance of a radar frequently, and the calibration method has good popularization and application prospects in the field of civil and military integration in the future, such as stealth aircraft, stealth tanks and other wave-absorbing coating fading characteristic measurement.
The calibration method can realize the calibration of the echo intensity Z parameters of various weather radars, not only can be in a maneuvering mode, but also can be fixedly erected for on-line calibration, and the calibration instrument designed by the method is configured to each on-line weather radar, so that the current situation that the intensity calibration is not carried out in the use stage of the current weather radar can be changed, the radar detection data quality and the weather forecast quality are greatly improved, and the economic benefit and the social benefit are higher.
According to the echo intensity Z parameter calibration method, the standard metal ball 50 moving along the radial direction of the radar at a high speed is erected on the ground, the standard metal ball 50 corresponds to the output amplitude of the simulated target, the simulated target amplitude of the standard metal ball 50 is calculated one by one along the radial distance direction of the radar, the radar echo intensity Z parameter calibration is realized, a correction parameter table is formed according to the error combination of Z parameter measurement systems obtained from all distance databases, each radar measurement value can be corrected in practical application by using the correction parameter table, and the accuracy and precision of the calibration are improved.
Fig. 7 is a schematic block diagram of an echo intensity Z parameter calibration apparatus 300 according to an embodiment of the present invention. As shown in fig. 7, the present invention further provides an echo intensity Z parameter calibration apparatus 300 corresponding to the above echo intensity Z parameter calibration method. The echo intensity Z parameter calibration apparatus 300 includes a unit for executing the above-described echo intensity Z parameter calibration method, and the apparatus may be configured in a server.
Specifically, referring to fig. 7, the echo intensity Z parameter calibration apparatus 300 includes:
a doppler echo forming unit 301 for selecting the standard metal ball 50, and making the standard metal ball 50 move at a high speed along the radar radial direction by ground erection to form a doppler echo;
a speed obtaining unit 302 for obtaining the radial movement speed of the standard metal ball 50;
an echo amplitude detection unit 303, configured to detect an echo amplitude of the standard metal ball 50 by using a doppler echo;
a parameter obtaining unit 304, configured to obtain parameters of the radar and parameters of the standard metal ball 50;
a first calibration value obtaining unit 305, configured to calculate, according to the parameter of the radar and the parameter of the standard metal ball 50, a Z parameter corresponding to the distance library in which the standard metal ball 50 is located, so as to obtain a calibration value of the echo intensity Z parameter of the distance library in which the standard metal ball 50 is located;
a transmission power obtaining unit 306, configured to perform simulated target transmission power processing according to the distance library in which the standard metal ball 50 is located, so as to obtain simulated target signal transmission power of the erection site equivalent standard metal ball 50;
a calibration unit 307, configured to calibrate a full-distance range by using the simulation target;
a correction value obtaining unit 308, configured to calculate an echo intensity Z parameter correction value of each distance library for each calibrated distance library;
a correction parameter table establishing unit 309, configured to establish a correction parameter table according to the echo intensity Z parameter correction value of each range bin;
and a second calibration value obtaining unit 310, configured to modify the radar measurement value by using the modification parameter table to obtain the calibration value of the echo intensity Z parameter.
In an embodiment, the first calibration value obtaining unit 305 includes:
the first parameter calculating subunit is used for calculating a standard echo intensity Z parameter of a distance library where the standard metal ball 50 is located according to the distance between the metal ball and the radar and the parameter of the radar;
the first error sample acquisition subunit is used for subtracting the standard echo intensity Z parameter of the corresponding distance library from the parameter of the radar to form a distance library error sample in which the standard metal ball 50 is located;
and the first calibration value obtaining subunit is configured to calculate an error sample mean value according to the error sample of the distance library in which the standard metal ball 50 is located, so as to obtain a calibration value of the echo intensity Z parameter of the distance library in which the standard metal ball 50 is located.
In an embodiment, the transmission power obtaining unit 306 includes:
the echo signal power acquiring subunit is used for acquiring the echo signal power of the standard metal ball 50 received by the radar;
the power calculation subunit is used for calculating the corresponding simulated target transmitting power of the standard metal ball 50;
the transmitting subunit is used for transmitting a simulation target signal to the radar by replacing the standard metal ball 50 with a simulation target;
the first adjusting subunit is used for adjusting the simulated target transmitting power to enable the target transmitting power to be equal to the echo amplitude of the standard metal ball 50;
the reading subunit is used for reading a radar signal processing result;
and the second adjusting subunit is used for adjusting the transmission power of the simulated target according to the radar signal processing result so as to obtain the transmission power of the simulated target signal of the erection point equivalent standard metal ball 50.
In one embodiment, the correction value obtaining unit 308 includes:
a true value obtaining subunit, configured to obtain a true value of a reflectivity coefficient of each range bin by emitting a simulated target signal calibrated by the standard metal ball 50;
the result acquisition subunit is used for reading radar measurement results of each range bin and simulated target transmitting power monitoring results;
and the error calculation subunit is used for calculating the reflectivity coefficient measurement system error according to the read radar measurement result of each range bank and the simulated target transmitting power monitoring result so as to obtain the echo intensity Z parameter correction value of each range bank.
It should be noted that, as can be clearly understood by those skilled in the art, the specific implementation process of the echo intensity Z parameter calibration apparatus 300 and each unit may refer to the corresponding description in the foregoing method embodiment, and for convenience and simplicity of description, details are not repeated herein.
The above-mentioned echo intensity Z parameter calibration apparatus 300 may be implemented in the form of a computer program, which can be run on a computer device as shown in fig. 8.
Referring to fig. 8, fig. 8 is a schematic block diagram of a computer device according to an embodiment of the present application. The computer device 500 is a server, and the server may be an independent server or a server cluster composed of a plurality of servers.
Referring to fig. 8, the computer device 500 includes a processor 502, memory, and a network interface 505 connected by a system bus 501, where the memory may include a non-volatile storage medium 503 and an internal memory 504.
The non-volatile storage medium 503 may store an operating system 5031 and a computer program 5032. The computer program 5032 comprises program instructions that, when executed, cause the processor 502 to perform an echo intensity Z parameter calibration method.
The processor 502 is used to provide computing and control capabilities to support the operation of the overall computer device 500.
The internal memory 504 provides an environment for the execution of the computer program 5032 in the non-volatile storage medium 503, and when the computer program 5032 is executed by the processor 502, the processor 502 may be caused to perform an echo intensity Z parameter calibration method.
The network interface 505 is used for network communication with other devices. Those skilled in the art will appreciate that the configuration shown in fig. 8 is a block diagram of only a portion of the configuration relevant to the present teachings and does not constitute a limitation on the computer device 500 to which the present teachings may be applied, and that a particular computer device 500 may include more or less components than those shown, or combine certain components, or have a different arrangement of components.
Wherein the processor 502 is configured to run the computer program 5032 stored in the memory to implement the following steps:
selecting a standard metal ball 50, and erecting the standard metal ball 50 on the ground to enable the standard metal ball 50 to move at a high speed along the radial direction of a radar so as to form a Doppler echo;
detecting the echo amplitude of the standard metal ball 50 by using Doppler echo;
acquiring the radial movement speed of the standard metal ball 50;
acquiring parameters of a radar and parameters of a standard metal ball 50;
calculating a Z parameter corresponding to a distance library in which the standard metal ball 50 is located according to the parameters of the radar and the parameters of the standard metal ball 50 to obtain an echo intensity Z parameter calibration value of the distance library in which the standard metal ball 50 is located;
performing simulated target transmitting power processing according to a distance library where the standard metal ball 50 is located to obtain simulated target signal transmitting power of the erection point equivalent standard metal ball 50;
calibrating the full-distance measuring range by using the simulation target;
calculating the echo intensity Z parameter correction value of each distance library for each calibrated distance library;
establishing a correction parameter table according to the echo intensity Z parameter correction value of each distance library;
when the radar echo intensity calibration value is used, the radar measured value is corrected by using the correction parameter table so as to obtain the echo intensity Z parameter calibration value.
In an embodiment, when the processor 502 implements the step of calculating the Z parameter corresponding to the distance library in which the standard metal ball 50 is located according to the parameter of the radar and the parameter of the standard metal ball 50 to obtain the calibration value of the echo intensity Z parameter in the distance library in which the standard metal ball 50 is located, the following steps are specifically implemented:
calculating a standard echo intensity Z parameter of a distance library where the standard metal ball 50 is located according to the distance between the metal ball and the radar parameter;
subtracting the standard echo intensity Z parameter of the corresponding distance library from the parameter of the radar to form a distance library error sample of the standard metal ball 50;
and calculating the mean value of the error samples according to the error samples of the distance library where the standard metal ball 50 is located so as to obtain the parameter calibration value of the echo intensity Z of the distance library where the standard metal ball 50 is located.
In an embodiment, when the processor 502 implements the step of performing the simulated target transmitting power processing according to the distance library in which the standard metal ball 50 is located to obtain the simulated target signal transmitting power of the erection point equivalent standard metal ball 50, the following steps are specifically implemented:
acquiring the echo signal power of a radar receiving standard metal ball 50;
calculating the corresponding simulated target transmitting power of the standard metal ball 50;
a simulated target is used for replacing the standard metal ball 50 to transmit a simulated target signal to the radar;
adjusting the simulated target transmitting power to enable the target transmitting power to be equal to the echo amplitude of the standard metal ball 50;
reading a radar signal processing result;
and adjusting the transmitting power of the simulated target according to the radar signal processing result to obtain the transmitting power of the simulated target signal of the erection point equivalent standard metal ball 50.
In an embodiment, when the processor 502 performs the step of calibrating the full-range measurement range by using the simulation target, the following steps are specifically performed:
and calculating the corresponding simulated target transmitting power of the standard metal ball 50 along the radial distance direction of the radar by the distance library.
In an embodiment, when the step of calculating the echo intensity Z parameter correction value of each distance library by using the calibrated distance libraries is implemented by the processor 502, the following steps are specifically implemented:
obtaining a true value of a reflectivity coefficient of each distance library by emitting a simulated target signal calibrated by a standard metal ball 50;
reading radar measurement results and simulated target transmitting power monitoring results of each distance library;
and calculating the error of the reflectivity coefficient measurement system according to the read radar measurement result of each range bank and the simulated target transmitting power monitoring result so as to obtain the echo intensity Z parameter correction value of each range bank.
The radar measurement result of each distance library comprises an output reflectivity coefficient and a reflectivity coefficient true value; the monitoring result of the simulated target transmitting power comprises a simulated target transmitting power average value, a simulated target transmitting power correction coefficient and the deviation of the echo intensity Z parameter caused by the correction coefficient.
In an embodiment, when implementing the step of calculating the reflectivity coefficient measurement system error according to the read radar measurement result of each range bin and the simulated target transmission power monitoring result to obtain the echo intensity Z parameter correction value of each range bin, the processor 502 specifically implements the following steps:
and obtaining the sum of the deviation of the echo intensity Z parameter caused by the correction coefficient of the simulated target transmitting power and the deviation of the radar output reflectivity coefficient and the reflectivity coefficient true value to form the echo intensity Z parameter correction value of each distance library.
It should be understood that in the embodiment of the present Application, the Processor 502 may be a Central Processing Unit (CPU), and the Processor 502 may also be other general-purpose processors, digital Signal Processors (DSPs), application Specific Integrated Circuits (ASICs), field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, and the like. Wherein a general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
It will be understood by those skilled in the art that all or part of the flow of the method implementing the above embodiments may be implemented by a computer program instructing associated hardware. The computer program includes program instructions, and the computer program may be stored in a storage medium, which is a computer-readable storage medium. The program instructions are executed by at least one processor in the computer system to implement the flow steps of the embodiments of the method described above.
It will be understood by those skilled in the art that all or part of the processes in the methods of the above embodiments may be implemented by hardware related to instructions of a computer program, and the computer program may be stored in a storage medium, which is a computer-readable storage medium. In the embodiment of the present invention, the computer program may be stored in a storage medium of a computer system and executed by at least one processor in the computer system to implement the steps of the process including the embodiments of the method for calibrating the Z parameter of each echo intensity as described above.
The storage medium may be a usb disk, a removable hard disk, a Read-Only Memory (ROM), a magnetic disk, or an optical disk, which can store various computer readable storage media.
Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative. For example, the division of each unit is only one logic function division, and there may be another division manner in actual implementation. For example, various elements or components may be combined or may be integrated in another system or some features may be omitted, or not implemented.
The steps in the method of the embodiment of the invention can be sequentially adjusted, combined and deleted according to actual needs. The units in the device of the embodiment of the invention can be merged, divided and deleted according to actual needs. In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a storage medium. Based on such understanding, the technical solution of the present invention essentially or partly contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a terminal, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. The method for calibrating the Z parameter of the echo intensity is characterized by comprising the following steps:
selecting a standard metal ball, and erecting the standard metal ball on the ground to enable the standard metal ball to move at a high speed along the radial direction of the radar so as to form a Doppler echo;
detecting the echo amplitude of the standard metal ball by using Doppler echo;
acquiring the radial movement speed of a standard metal ball;
acquiring parameters of a radar and parameters of a standard metal ball;
calculating a Z parameter corresponding to a distance library in which the standard metal ball is located according to the parameter of the radar and the parameter of the standard metal ball to obtain an echo intensity Z parameter calibration value of the distance library in which the standard metal ball is located;
carrying out simulated target transmitting power processing according to a distance library where the standard metal ball is located to obtain simulated target signal transmitting power of the equivalent standard metal ball of the erection point;
calibrating the full-distance measuring range by using the simulation target;
calculating the echo intensity Z parameter correction value of each distance library for each calibrated distance library;
establishing a correction parameter table according to the echo intensity Z parameter correction value of each distance library;
when in use, the radar measured value is corrected by using the correction parameter table to obtain the echo intensity Z parameter calibration value;
the method for processing the simulated target transmitting power according to the distance library of the standard metal ball to obtain the simulated target signal transmitting power of the equivalent standard metal ball of the erection point comprises the following steps:
acquiring the echo signal power of a radar receiving standard metal ball;
calculating the corresponding simulated target transmitting power of the standard metal ball;
a simulation target replaces a standard metal ball to transmit a simulation target signal to the radar;
adjusting the simulated target transmitting power to enable the target transmitting power to be equal to the echo amplitude of the standard metal ball;
reading a radar signal processing result;
adjusting the transmission power of the simulated target according to the radar signal processing result to obtain the transmission power of the simulated target signal of the equivalent standard metal ball of the erection point;
the calibration of the full-distance measuring range by using the simulation target comprises the following steps:
and calculating the transmitting power of the simulated target corresponding to the standard metal ball by the distance library along the radial distance direction of the radar.
2. The method for calibrating the echo intensity Z parameter according to claim 1, wherein the step of calculating the Z parameter corresponding to the distance library in which the standard metal ball is located according to the radar parameter and the standard metal ball parameter to obtain the echo intensity Z parameter calibration value in the distance library in which the standard metal ball is located comprises:
calculating a standard echo intensity Z parameter of a distance library where a standard metal ball is located according to the distance between the metal ball and the radar and the parameter of the radar;
subtracting the standard echo intensity Z parameter of the corresponding distance library from the parameter of the radar to form a distance library error sample in which the standard metal ball is positioned;
and calculating the mean value of the error samples according to the error samples of the distance library of the standard metal ball to obtain the echo intensity Z parameter calibration value of the distance library of the standard metal ball.
3. The method for calibrating the echo intensity Z parameter according to claim 1, wherein the calculating the echo intensity Z parameter correction value of each distance library for each calibrated distance library includes:
obtaining a real value of a reflectivity coefficient of each distance library by emitting a simulated target signal after standard metal ball calibration;
reading radar measurement results and simulated target transmitting power monitoring results of each distance library;
and calculating the error of the reflectivity coefficient measurement system according to the read radar measurement result of each range bank and the simulated target transmitting power monitoring result so as to obtain the echo intensity Z parameter correction value of each range bank.
4. The method for calibrating Z parameter of echo intensity according to claim 3, wherein the radar measurement result of each range bin includes an output reflectance coefficient and a true reflectance coefficient value; the monitoring result of the simulated target transmitting power comprises a simulated target transmitting power average value, a simulated target transmitting power correction coefficient and the deviation of the echo intensity Z parameter caused by the correction coefficient.
5. The method for calibrating the Z parameter of echo intensity according to claim 4, wherein the step of calculating the reflectivity coefficient measurement system error according to the read radar measurement result of each range bin and the simulated target transmission power monitoring result to obtain the Z parameter correction value of echo intensity of each range bin comprises the following steps:
and obtaining the sum of the deviation of the echo intensity Z parameter caused by the correction coefficient of the simulated target transmitting power and the deviation of the radar output reflectivity coefficient and the reflectivity coefficient true value to form the echo intensity Z parameter correction value of each distance library.
6. Echo intensity Z parameter calibration device, its characterized in that includes:
the Doppler echo forming unit is used for selecting a standard metal ball, and enabling the standard metal ball to move at a high speed in the radial direction of the radar through ground erection so as to form a Doppler echo;
the speed acquisition unit is used for acquiring the radial movement speed of the standard metal ball;
the echo amplitude detection unit is used for detecting the echo amplitude of the standard metal ball by using Doppler echo;
the parameter acquisition unit is used for acquiring parameters of the radar and parameters of the standard metal ball;
the first calibration value acquisition unit is used for calculating a Z parameter corresponding to a distance library in which the standard metal ball is located according to the parameter of the radar and the parameter of the standard metal ball so as to obtain a calibration value of the echo intensity Z parameter of the distance library in which the standard metal ball is located;
the transmitting power obtaining unit is used for carrying out simulated target transmitting power processing according to the distance library where the standard metal ball is located so as to obtain simulated target signal transmitting power of the erection point equivalent standard metal ball;
the calibration unit is used for calibrating the full-distance measuring range by utilizing the simulation target; calculating the transmitting power of the simulated target corresponding to the standard metal ball along the radial distance direction of the radar by distance library;
the correction value acquisition unit is used for calculating the echo intensity Z parameter correction value of each distance library for each calibrated distance library;
the correction parameter table establishing unit is used for establishing a correction parameter table according to the echo intensity Z parameter correction value of each distance library;
the second calibration value acquisition unit is used for correcting the radar measured value by using the correction parameter table during use so as to obtain the calibration value of the echo intensity Z parameter;
the transmission power acquiring unit includes:
the echo signal power acquiring subunit is used for acquiring the echo signal power of the standard metal ball 50 received by the radar;
the power calculation subunit is used for calculating the corresponding simulated target transmitting power of the standard metal ball 50;
the transmitting subunit is used for transmitting a simulation target signal to the radar by replacing the standard metal ball 50 with a simulation target;
the first adjusting subunit is used for adjusting the simulated target transmitting power to enable the target transmitting power to be equal to the echo amplitude of the standard metal ball;
the reading subunit is used for reading a radar signal processing result;
and the second adjusting subunit is used for adjusting the transmission power of the simulated target according to the radar signal processing result so as to obtain the transmission power of the simulated target signal of the erection point equivalent standard metal ball 50.
7. A computer arrangement, characterized in that the computer arrangement comprises a memory having stored thereon a computer program and a processor implementing the method according to any of claims 1-5 when executing the computer program.
8. A storage medium, characterized in that the storage medium stores a computer program which, when executed by a processor, implements the method according to any one of claims 1 to 5.
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