CN111398921A - Method for reducing uncertainty of radar photoelectric difference calibration - Google Patents
Method for reducing uncertainty of radar photoelectric difference calibration Download PDFInfo
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- CN111398921A CN111398921A CN202010324082.0A CN202010324082A CN111398921A CN 111398921 A CN111398921 A CN 111398921A CN 202010324082 A CN202010324082 A CN 202010324082A CN 111398921 A CN111398921 A CN 111398921A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000005259 measurement Methods 0.000 abstract description 6
- 230000003287 optical effect Effects 0.000 description 4
- 238000001259 photo etching Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 239000006185 dispersion Substances 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
- 230000009897 systematic effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4004—Means for monitoring or calibrating of parts of a radar system
- G01S7/4026—Antenna boresight
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4004—Means for monitoring or calibrating of parts of a radar system
- G01S7/4026—Antenna boresight
- G01S7/4034—Antenna boresight in elevation, i.e. in the vertical plane
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention relates to the technical field of radar angle measurement, in particular to a method for reducing uncertainty of radar photoelectric difference calibration. The method comprises the following steps: 1) the radar antenna is aligned to a calibration source in the state of the correcting mirror, the beacon is automatically tracked on the tower at the erecting position of the antenna, and the azimuth and pitch angle values displayed on the radar PDU are recorded
、
(ii) a And (3) lowering high voltage, lifting the antenna on the personnel A, observing the personnel A through a telescope, directing the personnel B to rotate the antenna, enabling the center of the cross reticle of the radar to coincide with the center of the cursor at the position of the positive image of the antenna, and recording the angle value displayed on the radar PDU
、
(ii) a 2) Inverting the mirror, aligning the radar antenna with the calibration source in the inverted state, adopting the step 1) at the inverted image position of the antenna, enabling the center of the cross reticle of the radar to coincide with the center of the cursor at the inverted image position of the antenna, and recording the angle value
(ii) a 3) Using formulas
，
Calculating the photoelectric difference KZAnd Kn。
Description
Technical Field
The invention relates to the technical field of radar angle measurement, in particular to a method for reducing uncertainty of radar photoelectric difference calibration.
Background
The photoelectric difference is a systematic error which needs to be corrected in the radar angle measurement process, and is defined as the 'non-parallelism of the radar electric axis and the optical axis, which is expressed by the deviation angle between the radar electric axis and the optical axis'. The photoelectric difference can be divided into azimuth error K according to the direction of the electric axis deviating from the optical axisAAnd pitch error KE. The uncertainty is defined as: due to the existence of measurement errors, the uncertainty of the measured value cannot be determined, and both the measuring instrument and the calibration method can influence the process of calibrating the radar photoelectric difference. The currently used method for calibrating the photoelectric difference of the radar adopts a telescope positive and negative mirror to observe a calibration source to obtain an error value. The test method comprises the following steps:
1) the radar antenna is aligned with the calibration source, the transmitter is applied with high voltage, and after tracking the stable electric mark, the radar antenna is obtainedAzimuth pitch value to this time
;
2) Locking the antenna, and determining the deviation from the center of the cursor to the center of the telescope by using a cursor scale
，
；
3) The antenna is provided with a reverse mirror to track the electric mark, and the azimuth pitch value of the reverse mirror at the moment is obtained
；
4) Locking the antenna, and determining the deviation from the center of the cursor to the center of the telescope by using a cursor scale
，
；
5) The photoelectric difference was calculated as follows:
the above method has the following 2 disadvantages:
1) locking the antenna results in a change in angle. When the antenna is locked, the driving motor of the antenna is powered off, and the brake is locked. In the process, because the servo system does not correct the angle and act on the braking force, the angle of the antenna can be changed to a certain extent, the amplitude is about 0.003-0.005 degrees, the direction is random, and the angle of the antenna is changed, so that when the deviation amount of a cursor is read, the antenna does not really align with an electric axis, the deviation angle is large, and the introduction of the data dispersion degree during photoelectric difference calibration is caused.
2) The data interpretation is difficult, resulting in large interpretation errors.
When the cursor is observed through the telescope, the scale lines are dense, the size of the cursor is large, and the cursor deviates from the center of the telescope cross scale far under the common condition, so that certain deviation can be caused in the observation process, and the accurate scale value corresponding to the center of the cursor is difficult to distinguish accurately. In addition, the cursor fades and the telescope scale is unclear, so that a large interpretation error is easily introduced during reading.
As shown in fig. 1, the interpretation error is very easy to bring large discreteness to the calibration data.
Disclosure of Invention
The invention aims to provide a method for reducing uncertainty of radar photoelectric difference calibration, which reduces errors.
In order to solve the technical problems, the technical scheme of the invention is as follows: a method for reducing uncertainty of radar photoelectric difference calibration comprises the following steps:
1) the radar antenna is aligned to a calibration source in the state of the correcting mirror, the beacon is automatically tracked on the tower at the erecting position of the antenna, and the azimuth and pitch angle values displayed on the radar PDU are recorded
、
；
And (3) lowering high voltage, lifting the antenna on the personnel A, observing the personnel A through a telescope, directing the personnel B to rotate the antenna, enabling the center of the cross reticle of the radar to coincide with the center of the cursor at the position of the positive image of the antenna, and recording the angle value displayed on the radar PDU
、
；
2) The method comprises the steps of inverting the mirror, aligning a radar antenna to a calibration source in an inverted mirror state, carrying out beacon self-tracking on a tower at an inverted image position of the antenna, and recording azimuth and pitch angle values displayed on a radar PDU (protocol data Unit)
、
；
When the high voltage is applied, the person A goes up the antenna, the person A observes through the telescope and instructs the person B to rotate the antenna, the center of the cross reticle of the radar is coincided with the center of the cursor at the inverted image position of the antenna, and the angle value is recorded
、
；
3) Using formulas
，
Calculating the photoelectric difference KZAnd Kn。
Preferably, the erect position is not pitched more than 90 °.
Preferably, the inverted position is not less than 90 ° in pitch.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, on the premise of not locking the antenna, the interpretation scale is changed into a cross-shaped division line of the interpretation center. The cross division line of the telescope scale plate is thicker, the telescope scale plate is clearer in visual field and easy to observe, the correspondence between the scale value and the center cross division line is found, meanwhile, the photoetching degree interpretation is changed into the radar PDU interpretation, the ultra-high precision radar PDU reading is fully utilized, the calculation is carried out by using a new formula, the angle interpretation is changed from the photoetching degree interpretation into the radar PDU interpretation, namely, the radar photoelectric difference calibration value is connected with the PDU reading,
by using the method, the uncertainty of radar photoelectric difference calibration can be reduced, and the measurement accuracy of the radar can be improved.
Drawings
FIG. 1 is a diagram illustrating an interpretation error in the background art;
FIG. 2 is a schematic diagram of a telescope cross center line alignment cursor black and white division line of the present invention;
FIG. 3 is a comparison graph of the type A uncertainty of the present invention and the background art;
FIG. 4 is a flow chart of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Referring to fig. 2 and 4, a method for reducing uncertainty of calibration of radar with a photoelectric difference according to the present invention includes the following steps:
firstly, 1) correcting the mirror, aligning the radar antenna to a calibration source in the state of the correcting mirror, automatically tracking the beacon on the tower at the erecting position (the pitching is not more than 90 degrees) of the antenna, and recording the azimuth and pitching angle values displayed on the radar PDU
、
；
In order to reduce interpretation error and avoid observing the position of the center of the cursor, the cross center line of the telescope is aligned with the position of the black and white division line of the cursor as shown in figure 2, then, high voltage is applied, the antenna is arranged on the personnel A, the personnel A observes through the telescope and instructs the personnel B to rotate the antenna, the center of the radar cross line is coincided with the center of the cursor at the positive image position of the antenna, and the radar is recordedUp to the angle value displayed on the PDU
、
；
2) Inverting the mirror, aligning the radar antenna to the calibration source in the inverted mirror state, automatically tracking the beacon on the tower at the inverted image position (the pitching is not less than 90 degrees) of the antenna, and recording the azimuth and pitch angle values displayed on the radar PDU
、
；
When the high voltage is applied, the person A goes up the antenna, the person A observes through the telescope and instructs the person B to rotate the antenna, the center of the cross reticle of the radar is coincided with the center of the cursor at the inverted image position of the antenna, and the angle value is recorded
、
；
3) Using formulas
，
Calculating the photoelectric difference KZAnd Kn。
And then, after the calibration times are enough, the arithmetic mean value of the calibration results of the N times is obtained, and finally, the operation is finished.
By the method, compared with the A-type uncertainty of the photoetching degree interpretation input quantity, the A-type uncertainty of the input quantity is generally lower and is greatly lower than the input quantity interpreted by the optical scale. Here, the direction input amount of the positive mirror cursor is taken as an example, and the photoetching degree is judgedRead
The invention is
The class-a uncertainty pair is shown in fig. 3, and it can be known from fig. 3 that uncertainty components introduced by randomness factors such as visual errors, difficulty in determining the cursor center, and unclear telescope scales are greatly reduced, and meanwhile, the calculated extended uncertainty (class-B uncertainty) is reduced by 65.9%.
Therefore, the method can reduce the uncertainty of errors generated in calibration, improve the reliability of calibration data, and avoid the introduction of system errors caused by higher uncertainty, so that the accuracy of the final radar angle measurement correction data can not meet the requirement.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (3)
1. A method for reducing uncertainty of radar photoelectric difference calibration is characterized by comprising the following steps:
1) the radar antenna is aligned to a calibration source in the state of the correcting mirror, the beacon is automatically tracked on the tower at the erecting position of the antenna, and the azimuth and pitch angle values displayed on the radar PDU are recorded
、
；
When the high voltage is applied, the person A goes up the antenna, the person A observes through the telescope and instructs the person B to rotate the antenna, and the center of the cross reticle of the radar and the center of the cursor are enabled to be positioned at the positive image position of the antennaCoincidence of centers, recording angle values displayed on radar PDU
、
；
2) The method comprises the steps of inverting the mirror, aligning a radar antenna to a calibration source in an inverted mirror state, carrying out beacon self-tracking on a tower at an inverted image position of the antenna, and recording azimuth and pitch angle values displayed on a radar PDU (protocol data Unit)
、
；
When the high voltage is applied, the person A goes up the antenna, the person A observes through the telescope and instructs the person B to rotate the antenna, the center of the cross reticle of the radar is coincided with the center of the cursor at the inverted image position of the antenna, and the angle value is recorded
、
；
3) Using formulas
，
Calculating the photoelectric difference KZAnd Kn。
2. The method for reducing radar photoelectric difference calibration uncertainty of claim 1, characterized by: the erect position is not pitched more than 90 °.
3. The method for reducing radar photoelectric difference calibration uncertainty of claim 1, characterized by: the inverted position is not less than 90 ° in pitch.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010324082.0A CN111398921A (en) | 2020-04-22 | 2020-04-22 | Method for reducing uncertainty of radar photoelectric difference calibration |
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| CN202010324082.0A CN111398921A (en) | 2020-04-22 | 2020-04-22 | Method for reducing uncertainty of radar photoelectric difference calibration |
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Citations (6)
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|---|---|---|---|---|
| CN101135726A (en) * | 2007-09-21 | 2008-03-05 | 北京航空航天大学 | Satellite carried SAR inner marking signal processing platform system and realization method thereof |
| JP2012205213A (en) * | 2011-03-28 | 2012-10-22 | Mitsubishi Electric Corp | Tracking antenna device adjustment method and tracking antenna device |
| CN103676621A (en) * | 2013-12-18 | 2014-03-26 | 哈尔滨工程大学 | Method and device for measuring electric signal transmission time in phase-type wire |
| CN104581067A (en) * | 2014-12-31 | 2015-04-29 | 中国人民解放军63680部队 | Radar antenna calibration telescope electronic imaging system |
| CN105812096A (en) * | 2016-03-15 | 2016-07-27 | 华中科技大学 | Method for improving decoding precision of physical layer of receiver by using check information of data link layer |
| CN108490406A (en) * | 2018-04-16 | 2018-09-04 | 中国人民解放军92941部队 | A kind of radar the match of electric axis with light axis detecting system and method |
-
2020
- 2020-04-22 CN CN202010324082.0A patent/CN111398921A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101135726A (en) * | 2007-09-21 | 2008-03-05 | 北京航空航天大学 | Satellite carried SAR inner marking signal processing platform system and realization method thereof |
| JP2012205213A (en) * | 2011-03-28 | 2012-10-22 | Mitsubishi Electric Corp | Tracking antenna device adjustment method and tracking antenna device |
| CN103676621A (en) * | 2013-12-18 | 2014-03-26 | 哈尔滨工程大学 | Method and device for measuring electric signal transmission time in phase-type wire |
| CN104581067A (en) * | 2014-12-31 | 2015-04-29 | 中国人民解放军63680部队 | Radar antenna calibration telescope electronic imaging system |
| CN105812096A (en) * | 2016-03-15 | 2016-07-27 | 华中科技大学 | Method for improving decoding precision of physical layer of receiver by using check information of data link layer |
| CN108490406A (en) * | 2018-04-16 | 2018-09-04 | 中国人民解放军92941部队 | A kind of radar the match of electric axis with light axis detecting system and method |
Non-Patent Citations (2)
| Title |
|---|
| 毛南平 等: ""船载雷达光机轴偏差的动态标校"", 《电讯技术》, vol. 54, no. 9, pages 1210 - 1215 * |
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