CN110824449A - Automatic calibration test method for multi-frequency-point radar seeker - Google Patents
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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
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Abstract
The invention relates to an automatic calibration test method for a multi-frequency point radar seeker, which is used for solving the problems of long time consumption, large workload, frequent operation, easy error and incapability of covering a full-temperature zone when the multi-frequency point radar seeker calibrates angle measurement slope parameters. According to the method, the efficiency is improved by automatically traversing the frequency point through the seeker, and the seeker small signal recharging is performed to perform power-on automatic gain correction so as to ensure the angle measurement precision at different temperatures. The experimental result shows that the method can effectively solve the problem of angle measurement distortion caused by temperature change, greatly improve the calibration efficiency of the angle measurement curve of the multi-frequency-point radar seeker, reduce the requirements on operators and facilitate the calibration of large-batch products.
Description
Technical Field
The invention relates to the field of radar seeker parameter calibration, in particular to an automatic calibration test method for angular slope parameters of a multi-frequency-point radar seeker.
Background
The radar seeker mostly adopts single-pulse angle measurement, and an angle error original value is calculated by a difference signal amplitude ratio. The original value is a curved hyperbolic curve, and is in one-to-one correspondence with the true angle error in the linear angle measurement area. The real angle error is an included angle between a target line-of-sight angle and an electric axis, the output angle error of the radar seeker needs to be consistent with the real angle error as much as possible in guidance, the original value of the angle error is mapped to the real angle error by using a multi-order polynomial, and the polynomial coefficient is called as an angle measurement curve coefficient. Therefore, the radar seeker needs to calibrate the angle error before use to obtain the angle measurement curve coefficient, and the multi-frequency radar seeker needs to calibrate each frequency point for improving the angle measurement precision because the angle measurement curve coefficients of different emission frequency points are different.
In the conventional calibration process, as shown in fig. 1, a radar seeker antenna fixes a detection target pointing to a bullet axis direction, performs single-pulse angle measurement on the target to output an original value of an angle error, manually adjusts a rotary table to step and stay for 10 times to obtain a true angle error of a corresponding position, obtains a current frequency point angle measurement slope curve by comparison calculation according to the original value and the true value, updates radar angle measurement parameters in a seeker program to verify, controls the seeker to switch frequency points after completion, and repeats the process. This method has the following two disadvantages. Firstly, the calibration efficiency is low, and the workload is large and the error is easy to make. Taking a certain multi-frequency-point radar seeker as an example, the seeker has 64 different frequency points, each azimuth pitch has 64 angle measurement curves to be calibrated, a turntable needs to perform 128-turn movement for 1280 times of stay by using a traditional method, 128 groups of angle measurement curve coefficients are calculated and generated, an operator updates radar parameters for 128 times, and performs 128 times of angle measurement verification. Secondly, because the amplitude gain of the sum and difference channel is inconsistent with the temperature change, the calibration curve can only represent the relation between the original value and the true value at the current temperature, which leads to the distortion of the calibration angle measurement curve at different temperatures. For example, the angle measurement curve obtained by calibration at normal temperature is compressed or amplified by one time due to the relative change of the amplitude of the difference channel or the sum channel by 3db at high and low temperatures, so that the distortion of the angle measurement curve is misaligned, and the angle measurement accuracy is affected.
Therefore, the invention designs an automatic calibration system of a multi-frequency-point radar seeker, improves the defects, improves the efficiency by automatically traversing frequency points through the seeker, and ensures the angle measurement precision at different temperatures by performing power-on automatic gain correction through small signal recharging of the seeker.
Disclosure of Invention
Technical problem to be solved
The invention solves the main problem of calibrating the angle measurement curve of the multi-frequency point radar seeker, and provides an automatic calibration test method easy for engineering realization aiming at the characteristics of large workload and incapability of covering a full temperature zone of the original method.
Technical scheme
An automatic calibration test method for a multi-frequency-point radar seeker is characterized by comprising the following steps:
step 1: electrifying the radar seeker for self-checking;
step 2: the radar seeker performs small signal recharging, three-channel amplitude is collected through a signal processor, the ratio of the direction channel amplitude, the pitching channel amplitude and the sum channel amplitude is obtained and is used as a current frequency point gain correction factor, and all frequency point gain correction factors are obtained after frequency points are traversed; the small-power signal is the average value of the saturated power and the minimum detection power of the receiving branch of the transceiving component;
and step 3: tracking the target according to the instruction of the upper computer, correcting the original value of the angular error by using the gain correction factor calculated in the step (2), and outputting the error after correction to the upper computer;
and 4, step 4: the upper computer sends out a sequential frequency hopping instruction to control the seeker to traverse all frequency points and records output data of the seeker and the rotary table;
and 5: according to the frequency point traversal condition, the upper computer automatically controls the rotary table to move to the next position for staying;
step 6: the method comprises the steps that after a turntable traverses a designated position, all frequency point data of one-dimensional angle errors are acquired, frequency point angle measurement data at a certain moment are taken out according to frequency point numbers returned at the same moment, then the angle measurement data are distributed to the turntable according to the moment of an upper computer, the angle measurement data are arranged from negative to positive, the mean value of a number series is sequentially obtained, and least square fitting is carried out to obtain a correction polynomial coefficient;
and 7: repeating the steps 1-6 to calculate all frequency point angle measurement curves in another dimension;
and 8: reading the orientation and pitching angle measurement curve matrixes, writing a plurality of parameters in the obtained curves into a txt file to generate codes according to an agreed variable name and a grammatical expression, and updating the parameters of the radar seeker;
and step 9: and after the angle measurement curve coefficients are updated into the radar seeker, all frequency point angle measurement curve verification is completed by one-time movement.
Advantageous effects
The method solves the problems of long time consumption, large workload, frequent operation, easy error and incapability of covering a full temperature zone when the multi-frequency point radar seeker carries out angle measurement slope parameter calibration. According to the method, the efficiency is improved by automatically traversing the frequency point through the seeker, and the seeker small signal recharging is performed to perform power-on automatic gain correction so as to ensure the angle measurement precision at different temperatures. The experimental result shows that the method can effectively solve the problem of angle measurement distortion caused by temperature change, greatly improve the calibration efficiency of the angle measurement curve of the multi-frequency-point radar seeker, reduce the requirements on operators and facilitate the calibration of large-batch products.
The radar seeker is automatically calibrated by adopting the method, and the angle measurement curve is shown in figure 3. The test result shows that the automatic calibration method can effectively solve the problem of angle measurement distortion caused by temperature change, greatly improve the calibration efficiency of the angle measurement curve of the multi-frequency-point radar seeker, improve the calibration of a set of prototype before the calibration for 3 days, and improve the calibration of a set of prototype after the calibration for 3 hours, thereby reducing the requirements on operators and being beneficial to the calibration of mass products.
Drawings
FIG. 1 shows a flow chart of a manual calibration test of a radar seeker
FIG. 2 is a flow chart of an automatic calibration test of a radar seeker
FIG. 3 is a graph of the results of automatic calibration after the practice of the present invention
FIG. 4 example of implementation
Detailed Description
The flow of the automatic calibration testing method for the multi-frequency-point radar seeker is shown in fig. 2, and the automatic calibration testing method mainly comprises two parts, namely gain correction of each frequency point channel and calibration of an angle measurement curve coefficient, and specifically comprises the following steps:
firstly, gain correction of each frequency point is carried out, the pilot head is electrified for self-checking, the frequency synthesizer is put into a small signal mode, a small excitation signal is transmitted and enters an antenna test channel after being subjected to frequency conversion by a receiving and sending component, the test channel divides the small signal into three paths of constant amplitude signals and returns the three paths of constant amplitude signals to a receiving channel of the receiving and sending component, and therefore the difference of the three paths of amplitude values received by the radar pilot head represents the gain difference of each receiving branch. In the invention, a sum road is taken as an amplitude reference, and the azimuth difference amplitude and the pitch difference amplitude are divided by the sum road amplitude respectively to obtain the azimuth gain correction factor and the pitch correction factor of the current frequency point. The seeker automatically controls the frequency point to traverse, switch and circulate the process to obtain all frequency point gain correction factors. And dividing the original value of the measured angle error by the corresponding frequency point correction factor, namely obtaining the original value of the standard angle error under the condition that the gain of the sum channel and the gain of the difference channel are equal, and calibrating by using the corrected original value to obtain the coefficient of the standard angle measurement curve. When the radar seeker is actually used, small-signal recharging self-checking is completed each time the radar seeker is electrified to obtain a channel gain correction factor at the current temperature, an angle error original value is corrected, and then the radar seeker can be adapted to a laboratory calibration standard angle measurement curve, and angle measurement distortion caused by different channel gains at different temperatures is eliminated. And after the gain correction factor is obtained, starting to calibrate the coefficient of the automatic angle measurement curve, controlling the seeker to open-loop track an ideal target by the upper computer, controlling the seeker to sequentially switch frequency points after the seeker enters open-loop tracking, and outputting an original value of the gain correction rear angle error. The radar seeker in the system has the capability of switching the frequency points according to the CPI, the statistical accuracy is improved for increasing the sample size, each frequency point continuously stays for dozens of frames in the calibration process, and all frequency points cycle for one time and less than 1 minute when a single frequency point consumes less than 1 second. After all the frequency points at the position are circulated once, the upper computer sends out an instruction, and the rotary table moves to the next staying position to repeat the process. The original value of the angle error of a certain dimension of all frequency points and the real value data (reading the information of the rotary table) are obtained in one movement, the rotary table only needs to perform 2-turn movement for 20 times, polynomial fitting is performed twice after automatic identification by a matlab resolving program, and all the 128 angle measuring curves of 64 frequency point directions and pitching are calculated. After the calculation is finished, the angle measurement curve coefficients are respectively generated into azimuth and pitch coefficient matrixes, a matlab angle measurement code generation program is imported, and 512 parameters of the 128 curves are written into a txt file according to the agreed variable names and the syntax format. The tester copies the file content and replaces a specified position code in the radar seeker data processing software to finish the updating of all frequency point angle measurement curve parameters at one time, thereby avoiding the possibility of operation errors caused by manual input of a large number of parameters.
The invention will now be further described with reference to an embodiment, as shown in fig. 4:
1. electrifying the radar seeker for self-checking;
2. the radar seeker performs small signal recharging, three-channel amplitude is collected through a signal processor, the ratio of the direction channel amplitude, the pitching channel amplitude and the sum channel amplitude is obtained and is used as a current frequency point gain correction factor, and all frequency point gain correction factors are obtained after frequency points are traversed; the small-power signal is the average value of the saturated power and the minimum detection power of the receiving branch of the transceiving component;
3. and (3) tracking the ideal target according to the instruction of the upper computer, correcting the original value of the angular error by using the gain correction factor calculated in the step (2), and outputting the angular error after correction to the upper computer for recording.
4. And the upper computer sends a sequential frequency hopping instruction to control the seeker to traverse all frequency points and record output data of the seeker and the rotary table.
5. According to the frequency point traversal condition, the upper computer automatically controls the rotary table to move to the next position for staying;
6. the method comprises the steps that after a turntable traverses a designated position, all frequency point data of one-dimensional angle errors are obtained, automatic calculation software is called to calculate all frequency point angle measurement curves, the calculation software firstly returns frequency point numbers at the same moment to take out frequency point angle measurement data at a certain moment, then turntable angles are issued according to the moment of an upper computer to arrange the angle measurement data from negative to positive, the mean value of a number series is sequentially obtained, and least square fitting is carried out to obtain a correction polynomial coefficient;
7. repeating the steps 1-6 to calculate all frequency point angle measurement curves in another dimension;
8. reading the azimuth and elevation angle measurement curve matrix, calling code automatic generation software, enabling the code automatic generation software to read calculation software to generate a coefficient matrix file, writing 512 parameters of 128 curves into a txt file according to an agreed variable name and a syntax format to generate codes, and updating radar seeker parameters.
9. And after the angle measurement curve coefficients are updated into the radar seeker, all frequency point angle measurement curve verification is completed by one-time movement.
Claims (1)
1. An automatic calibration test method for a multi-frequency-point radar seeker is characterized by comprising the following steps:
step 1: electrifying the radar seeker for self-checking;
step 2: the radar seeker performs small signal recharging, three-channel amplitude is collected through a signal processor, the ratio of the direction channel amplitude, the pitching channel amplitude and the sum channel amplitude is obtained and is used as a current frequency point gain correction factor, and all frequency point gain correction factors are obtained after frequency points are traversed; the small-power signal is the average value of the saturated power and the minimum detection power of the receiving branch of the transceiving component;
and step 3: tracking the target according to the instruction of the upper computer, correcting the original value of the angular error by using the gain correction factor calculated in the step (2), and outputting the error after correction to the upper computer;
and 4, step 4: the upper computer sends out a sequential frequency hopping instruction to control the seeker to traverse all frequency points and records output data of the seeker and the rotary table;
and 5: according to the frequency point traversal condition, the upper computer automatically controls the rotary table to move to the next position for staying;
step 6: the method comprises the steps that after a turntable traverses a designated position, all frequency point data of one-dimensional angle errors are acquired, firstly, frequency point angle measurement data at a certain moment are taken out according to frequency point numbers returned at the same moment, then, the angle of the turntable is issued according to the moment of an upper computer, the angle measurement data are arranged from negative to positive, the mean value of a number series is sequentially obtained, and least square fitting is carried out to obtain a correction polynomial coefficient;
and 7: repeating the steps 1-6 to calculate all frequency point angle measurement curves in another dimension;
and 8: reading the orientation and pitching angle measurement curve matrixes, writing a plurality of parameters in the obtained curves into a txt file to generate codes according to an agreed variable name and a grammatical expression, and updating the parameters of the radar seeker;
and step 9: and after the angle measurement curve coefficients are updated into the radar seeker, all frequency point angle measurement curve verification is completed by one-time movement.
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| CN111628834A (en) * | 2020-04-08 | 2020-09-04 | 成都芯通软件有限公司 | EQ calibration and configuration method for multi-band HFC equipment |
| CN111796246A (en) * | 2020-06-12 | 2020-10-20 | 中国船舶重工集团公司第七二四研究所 | Azimuth multi-parameter combined correction method for wave beam offset of waveguide slot antenna |
| CN112051563A (en) * | 2020-08-29 | 2020-12-08 | 西安电子工程研究所 | Method for automatically acquiring monopulse angle measurement coefficient based on direct wave |
| CN113359093A (en) * | 2020-03-05 | 2021-09-07 | 华为技术有限公司 | Radar testing method and device |
| CN113466837A (en) * | 2021-06-23 | 2021-10-01 | 湖北三江航天万峰科技发展有限公司 | Calibration system and method for measurement precision of laser angle measurement device |
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| CN113466837A (en) * | 2021-06-23 | 2021-10-01 | 湖北三江航天万峰科技发展有限公司 | Calibration system and method for measurement precision of laser angle measurement device |
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