CN111426702A - Calibration method of radar reflectivity test system of stealth material RCS method - Google Patents
Calibration method of radar reflectivity test system of stealth material RCS method Download PDFInfo
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- CN111426702A CN111426702A CN202010434403.2A CN202010434403A CN111426702A CN 111426702 A CN111426702 A CN 111426702A CN 202010434403 A CN202010434403 A CN 202010434403A CN 111426702 A CN111426702 A CN 111426702A
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- 238000002310 reflectometry Methods 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 50
- 238000012360 testing method Methods 0.000 title claims abstract description 45
- 239000000463 material Substances 0.000 title claims abstract description 21
- 229910052751 metal Inorganic materials 0.000 claims abstract description 119
- 239000002184 metal Substances 0.000 claims abstract description 119
- 238000005259 measurement Methods 0.000 claims abstract description 33
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 239000011358 absorbing material Substances 0.000 abstract description 3
- 238000012545 processing Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N22/00—Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more
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Abstract
The invention relates to a calibration method of a radar reflectivity test system by a stealth material RCS method, which comprises the steps of setting instrument parameters; selecting corresponding blank metal plates and standard metal plates; measuring the reflected power of the system background; measuring the reflected power of the blank metal plate; measuring the reflected power of the standard metal plate; the test system calculates to obtain a standard metal plate reflectivity measurement value according to the reflection power of the system background, the reflection power of the blank metal plate and the reflection power of the standard metal plate; taking the arithmetic mean value of the 6 repeated measurement results as a standard metal plate reflectivity measured value, and calculating according to the standard metal plate reflectivity measured value and the standard metal plate reflectivity standard value to obtain a reflectance measurement result indication value error of the test system; and calculating the repeatability of the measurement result according to a Bessel formula. The invention is economical and practical and is simple and convenient to operate; the calibration accuracy is high; the accuracy of the measurement result of the RCS method radar reflectivity test system can be guaranteed, and the performance reliability of the radar wave-absorbing material can be guaranteed.
Description
Technical Field
The invention belongs to the field of calibration of radar reflectivity measurement systems, and particularly relates to a calibration method of a radar reflectivity test system by a stealth material RCS (radar scattering cross section) method.
Background
The stealth material is the most important technical approach for weapon equipment to realize stealth, and the radar reflectivity is a direct quantitative index for measuring the stealth performance of the stealth material. The radar cross section method is a commonly used radar reflectivity test method, and is a structural schematic diagram of an RCS method radar reflectivity test system according to an embodiment of the present invention, as shown in fig. 1. The radar reflectivity testing system by the RCS method mainly comprises: a compact range 1 (or a horn transmitting and receiving antenna) arranged in a microwave dark room, an alignment device 2, a support 3, a laser positioning rotary table 4, a signal transmitting and receiving device 5, a vector network analyzer 6, a computer 7, a laser positioning rotary table driving controller 8, test software and the like.
The accuracy of the test result of the radar reflectivity test system by the RCS method is of great significance, so that the radar reflectivity test system by the RCS method needs to be calibrated. However, at present, no calibration method for the whole radar reflectivity test system by the RCS method exists in China, the quantity value tracing can be realized only by respectively calibrating each component of the system, and the accuracy of the measurement result of the whole test system cannot be ensured due to the single normal operation of each component.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide a calibration method for a radar reflectivity testing system by a stealth RCS method, which solves the problem that the testing system cannot be calibrated integrally.
In order to explain the technical content of the present invention, some technical terms referred to in the present invention are described below:
reflected power of system background: the unit of the power of the radar wave reflected by the environment where the measured material plate is located is dBmW.
Blank metal sheet: the device is made of a good metal conductor with a smooth surface, and provides zero reference for the measurement process for total reflection of radar waves.
Reflected power of blank metal plate: the unit is dBmW, which refers to the power of the radar wave reflected back after the radar wave with certain power is projected on the blank metal plate.
Standard metal plate: the radar wave reflection rate measuring device is made of a good metal conductor with the same smooth surface as a blank metal plate, and can generate different radar wave reflection rate values according to different sizes.
Reflected power of standard metal plate: the unit is dBmW, which refers to the power of the radar wave reflected back after the radar wave with certain power is projected on a standard metal plate.
Standard sheet metal reflectance measurements: the standard metal plate has different standard reflectivity values according to different side lengths, and the reflectivity measurement value of the standard metal plate to be measured can be measured by using the calibrated reflectivity test system to measure the standard metal plate, wherein the unit is dB. The difference between the measured value and the standard value is the measurement error of the test system.
The invention is realized by the following technical scheme:
a calibration method of a radar reflectivity testing system of a stealth material RCS method comprises the following steps:
(1) setting instrument parameters of a test system;
(2) selecting corresponding blank metal plates and standard metal plates according to the calibration frequency range and the calibration points;
(3) measuring the reflected power of the system background;
(4) placing a blank metal plate on a bracket and aligning, and measuring the reflected power of the blank metal plate;
(5) taking the blank metal plate down, placing the standard metal plate on the bracket and aligning, and measuring the reflected power of the standard metal plate;
(6) the test system calculates to obtain a standard metal plate reflectivity measurement value according to the reflection power of the system background, the reflection power of the blank metal plate and the reflection power of the standard metal plate;
(7) calculating the repeatability of the measurement result by using a Bessel formula usually adopts repeated measurement for 6 times, repeating the steps (3) to (6) for 6 times, taking the arithmetic mean value of the 6 repeated measurement results as a measured value of the reflectivity of the standard metal plate, and calculating according to the measured value of the reflectivity of the standard metal plate and the standard value of the reflectivity of the standard metal plate to obtain the error of the indicated value of the reflectivity measurement result of the test system;
(8) the measurement repeatability was calculated according to the bessel formula based on the 6 repeated measurements.
The standard value of the reflectivity of the standard metal plate is calculated by the side lengths of the blank metal plate and the standard metal plate according to the following formula:
wherein:
s-standard metal plate reflectivity standard value, unit dB;
l1-standard metal plate side length in mm;
l2blank metal sheet side length, unit mm.
The blank metal plate and the standard metal plate related by the invention are made of the following materials: aluminum or copper. The two materials have good conductivity, easy processing and low cost.
The blank metal plate and the standard metal plate related by the invention have smooth and flat surfaces and parallel two side surfaces. If the surface is not smooth and uneven, the electromagnetic wave irradiates the surface of the metal plate and is reflected to other directions, and the accuracy of the calibration result is seriously influenced.
The blank metal plate and the standard metal plate are square flat plates. The reflectivity values of the square metal plates can be calculated theoretically. This is also a sample processing requirement for reflectance measurements.
The blank metal plate related by the invention has the side length of 40-200 mm.
The blank metal plate related by the invention has the thickness of 2-4 mm.
The standard metal plate related by the invention has the side length of 20-150 mm.
The standard metal plate related to the invention has the thickness of 2-4 mm.
The sizes of the blank metal plate and the standard metal plate are designed to meet the sample processing requirement of an RCS method test system in a GJB2038A-2011 radar absorbing material reflectivity test method and meet the magnitude requirement in a calibration process.
The invention has the beneficial effects that:
1) the calibration of the radar reflectivity test system by the RCS method can be realized only by two metal plates, and the method is economical, practical and simple and convenient to operate;
2) the method can realize the integral calibration of the radar reflectivity test system by the RCS method, and has high calibration accuracy;
3) the method can guarantee the accuracy of the measurement result of the RCS method radar reflectivity test system and the performance reliability of the radar wave-absorbing material.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are specific embodiments of the invention, and that other drawings within the scope of the present application can be obtained by those skilled in the art without inventive effort.
FIG. 1 is a schematic structural diagram of an RCS method radar reflectivity testing system according to an embodiment of the present invention;
in the figure, 1-compact range, 2-laser positioning alignment device, 3-support, 4-turntable, 5-signal transceiver, 6-vector network analyzer, 7-computer and 8-turntable driving controller.
Detailed Description
The calibration method according to the present invention is further illustrated below with reference to specific examples, which are the values of-5 dB, -10dB and-15 dB, respectively, and are commonly used technical indicators of reflectivity performance of stealth materials, but the present invention is not limited to these examples.
Example one
A calibration method of a radar reflectivity testing system of a stealth material RCS method comprises the following steps:
(1) setting the test frequency to be 6 GHz-18 GHz, and calibrating the indicating value error of the radar reflectivity to be-10 dB.
(2) Selecting a blank metal plate with the size of 180.00mm × 180.00.00 mm × 4.00.00 mm (the length is × mm and the width is × mm), selecting a standard metal plate with the size of 101.22mm × 101.22mm × 4.00.00 mm (the side is × and the side is × mm), and setting the standard reflectivity value s of the standard metal plate to-10.0 dB;
(3) measuring the background reflected power of the system;
(4) placing a blank metal plate on a bracket and aligning, and then measuring the reflected power of the blank metal plate;
(5) taking the blank metal plate down, placing the standard metal plate on the bracket and aligning, and then measuring the reflected power of the standard metal plate;
(6) calculating a standard metal plate reflectivity measurement value a according to the background reflected power, the blank metal plate reflected power and the standard metal plate reflected power;
(7) repeating the steps (3) to (6)6 times, and calculating the arithmetic mean value of the results of the 6 measurements
Is the measured value of the reflectivity of the standard metal plate.
(8) Measurement result indication error of-10 dB in range of 6 GHz-18 GHz of test system
Example two
A calibration method of a radar reflectivity testing system of a stealth material RCS method comprises the following steps:
(1) setting the test frequency to be 18 GHz-40 GHz, and calibrating the indicating value error of the radar reflectivity to be-15 dB.
(2) Selecting a blank metal plate with the size of 85.00mm × 85.00.00 mm × 4.00.00 mm (the side × and the side × are thick), selecting a standard metal plate with the size of 35.84mm × 35.84.84 mm × 4.00.00 mm (the side × and the side × are thick), and setting the standard reflectivity value s of the standard metal plate to-15.0 dB;
(3) measuring the background reflected power of the system;
(4) placing a blank metal plate on a bracket and aligning, and then measuring the reflected power of the blank metal plate;
(5) taking the blank metal plate down, placing the standard metal plate on the bracket and aligning, and then measuring the reflected power of the standard metal plate;
(6) calculating a standard metal plate reflectivity measurement value a according to the background reflected power, the blank metal plate reflected power and the standard metal plate reflected power;
(7) repeating the step (3) to the step (6)6 times, wherein the arithmetic mean value of the 6 times of measurement results is the measured value of the reflectivity of the standard metal plate;
(8) measurement result indication error of-15 dB in the range of 18 GHz-40 GHz of test system
EXAMPLE III
A calibration method of a radar reflectivity testing system of a stealth material RCS method comprises the following steps:
(1) setting the test frequency to be 40 GHz-110 GHz, and calibrating the indicating value error of the radar reflectivity to be-5 dB.
(2) Selecting a blank metal plate with the size of 60.00mm × 60.00.00 mm × 3.00.00 mm (the side × and the side × are thick), selecting a standard metal plate with the size of 45.00mm × 45.00.00 mm × 3.00.00 mm (the side × and the side × are thick), and setting the standard reflectivity value s of the standard metal plate to-5.0 dB;
(3) measuring the background reflected power of the system;
(4) placing a blank metal plate on a bracket and aligning, and then measuring the reflected power of the blank metal plate;
(5) taking the blank metal plate down, placing the standard metal plate on the bracket and aligning, and then measuring the reflected power of the standard metal plate;
(6) calculating a standard metal plate reflectivity measurement value a according to the background reflected power, the blank metal plate reflected power and the standard metal plate reflected power;
(7) repeating the steps (3) to (6)6 times, and calculating the arithmetic mean value of the results of the 6 measurements
Is a measured value of the reflectivity of a standard metal plate;
(8) the measurement result indication error of the test system is-5 dB within the range of 40 GHz-110 GHz
Finally, it is to be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the technical solutions of the present invention, and the scope of the present invention is not limited thereto. Those skilled in the art will understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein.
Claims (7)
1. A calibration method of a radar reflectivity testing system of a stealth material RCS method is characterized by comprising the following steps:
(1) setting instrument parameters of a test system;
(2) selecting corresponding blank metal plates and standard metal plates according to the calibration frequency range and the calibration points;
(3) measuring the reflected power of the system background;
(4) placing a blank metal plate on a bracket and aligning, and measuring the reflected power of the blank metal plate;
(5) placing a standard metal plate on a bracket and aligning, and measuring the reflected power of the standard metal plate;
(6) the test system calculates to obtain a standard metal plate reflectivity measurement value according to the reflection power of the system background, the reflection power of the blank metal plate and the reflection power of the standard metal plate;
(7) repeating the steps (3) to (6) for 6 times, wherein the arithmetic mean value of the 6 repeated measurement results is used as a standard metal plate reflectivity measured value, and the error of the measured value of the reflectivity of the test system is obtained by calculation according to the standard metal plate reflectivity measured value and the standard metal plate reflectivity standard value;
(8) the measurement repeatability was calculated according to the bessel formula based on the 6 repeated measurements.
2. The method for calibrating the RCS radar reflectivity test system for the stealth material as recited in claim 1, wherein the standard reflectivity value of the standard metal plate is determined by the side lengths of the blank metal plate and the standard metal plate according to a formula
Calculating to obtain;
wherein: s-standard metal plate reflectivity standard value, unit dB; l1-standard metal plate side length in mm; l2Blank metal sheet side length, unit mm.
3. The calibration method of the radar reflectivity testing system of the stealth material RCS method according to claim 2, wherein the blank metal plate and the standard metal plate are made of: aluminum or copper.
4. The calibration method of the RCS method radar reflectivity test system of the stealth material as recited in claim 3, wherein the blank metal plate and the standard metal plate have smooth and flat surfaces and parallel sides.
5. The method for calibrating a radar reflectivity testing system of a stealth material RCS method according to claim 4, wherein the blank metal plate and the standard metal plate are square flat plates.
6. The calibration method of the RCS method radar reflectivity measuring system of the stealth material as claimed in any one of claims 1 to 5, wherein the blank metal plate has a side length of 40mm to 200mm and a thickness of 2mm to 4 mm.
7. The calibration method of the RCS method radar reflectivity testing system of the stealth material as claimed in any one of claims 1 to 5, wherein the standard metal plate has a side length of 20mm to 150mm and a thickness of 2mm to 4 mm.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102305799A (en) * | 2011-05-25 | 2012-01-04 | 北京航空航天大学 | Standard reflecting plate for measuring errors among different testing systems and manufacturing method for standard reflecting plate |
| CN204269566U (en) * | 2014-12-01 | 2015-04-15 | 成都飞机工业（集团）有限责任公司 | A kind of portable microwave absorbing coating reflectivity self calibration test probe |
| CN106226260A (en) * | 2016-08-10 | 2016-12-14 | 武汉大学 | A kind of combination microwave and the Soil Moisture Inversion method of infrared remote sensing image |
| CN107247249A (en) * | 2017-07-12 | 2017-10-13 | 周浩 | A kind of alternating current-direct current ammeter tester calibrating installation and calibration method |
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2020
- 2020-05-20 CN CN202010434403.2A patent/CN111426702A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102305799A (en) * | 2011-05-25 | 2012-01-04 | 北京航空航天大学 | Standard reflecting plate for measuring errors among different testing systems and manufacturing method for standard reflecting plate |
| CN204269566U (en) * | 2014-12-01 | 2015-04-15 | 成都飞机工业（集团）有限责任公司 | A kind of portable microwave absorbing coating reflectivity self calibration test probe |
| CN106226260A (en) * | 2016-08-10 | 2016-12-14 | 武汉大学 | A kind of combination microwave and the Soil Moisture Inversion method of infrared remote sensing image |
| CN107247249A (en) * | 2017-07-12 | 2017-10-13 | 周浩 | A kind of alternating current-direct current ammeter tester calibrating installation and calibration method |
Non-Patent Citations (1)
| Title |
|---|
| 中国人民解放军总装备部: "《GJB2038A-2011雷达吸波材料反射率测试方法》", 31 August 2011 * |
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Application publication date: 20200717 |