CN113884977A - Correction method for one-dimensional interferometer direction finding cone effect - Google Patents
Correction method for one-dimensional interferometer direction finding cone effect Download PDFInfo
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- CN113884977A CN113884977A CN202110940663.1A CN202110940663A CN113884977A CN 113884977 A CN113884977 A CN 113884977A CN 202110940663 A CN202110940663 A CN 202110940663A CN 113884977 A CN113884977 A CN 113884977A
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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
- G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
- G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
- G01S3/14—Systems for determining direction or deviation from predetermined direction
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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
- G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
- G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
- G01S3/023—Monitoring or calibrating
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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
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The invention discloses a correction method for a one-dimensional interferometer direction-finding cone effect, based on the direction-finding principle of the one-dimensional interferometer, the arrival angle theta of a signal is as follows:
wherein, phi is phase difference achieved by two paths of signals, lambda is signal wavelength, l is antenna distance, when an incident signal and an antenna visual axis are not in the same plane, a cone effect exists, and the correction method comprises the following steps: based on the acquired signal pitch angle β and the measured signal arrival angle θ, the correction calculation of the azimuth angle α is completed by the following formula: alpha-sin‑1(sin θ/cos β). The invention can not be influenced by the cone effect caused by a large pitch angle, and can improve the accuracy of azimuth direction finding of the one-dimensional interferometer.
Description
Technical Field
The invention belongs to the technical field of electronics, and particularly relates to a correction method for a one-dimensional interferometer direction finding cone effect.
Background
In the electronic reconnaissance field, the interferometer direction finding is a mature direction finding system, the size and the direction finding precision of an antenna array can be considered, high-precision direction finding can be realized on a medium-small airborne platform, and along with the development of a high-speed digital processing technology, the intermediate frequency digital interferometer measuring technology generated by combining the direction finding technology and a digital technology has the advantages of high sensitivity, high direction finding precision, good stability, capability of realizing high-precision quick positioning by utilizing the phase change rate and the like, can adapt to a complex electromagnetic signal environment, and is very wide in application. However, the method is also limited by the limitations of the installed platform and hardware resources, and generally only one-dimensional interferometers are arranged, and if the common installed platform is only provided with a horizontal direction interferometer direction finding array, only one-dimensional direction finding can be performed. Under the influence of the cone effect, when a certain pitch angle visual angle exists due to the maneuvering of the aircraft or the altitude difference, the direction finding precision of the one-dimensional interferometer is seriously reduced (shore civil engineering 'influence of the pitch angle on the direction finding precision of the one-dimensional interferometer', ship electronic countermeasure, 10 months in 2012, volume 35, period 5), as shown in fig. 1.
At present, the method mainly carries out processing by reducing the height difference between a reconnaissance platform and a target, controlling the maneuvering range of a carrier, eliminating direction-finding values in a large maneuvering window and the like, limits application scenes, improves the tactical maneuvering or control difficulty of the carrier, cannot substantially improve direction-finding precision, limits the direction-finding application of a one-dimensional interferometer, and has a very limited practical application effect.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a correction method for the direction finding cone effect of a one-dimensional interferometer.
The purpose of the invention is realized by the following technical scheme:
a correction method for cone effect of direction finding of a one-dimensional interferometer is based on the direction finding principle of the one-dimensional interferometer, and the arrival angle theta of a signal is as follows:
wherein phi is phase difference of two paths of signals, lambda is signal wavelength, l is antenna distance, when the incident signal and the antenna visual axis are not in the same plane, a cone effect exists,
the correction method comprises the following steps: based on the acquired signal pitch angle β and the measured signal arrival angle θ, the correction calculation of the azimuth angle α is completed by the following formula:
α＝sin-1(sinθ/cosβ)。
according to a preferred embodiment, a first error correction table is constructed based on the relationship between the azimuth angle α and the elevation angle β and the arrival angle θ, and the first error correction table includes the elevation angle β, the arrival angle θ and a correction value, wherein the correction value is the azimuth angle α/the arrival angle θ.
According to a preferred embodiment, the first error correction table is: the arrival angle-pitch angle correction lookup table is shown in table 1:
TABLE 1 Angle of arrival-Pitch correction lookup Table
Wherein the units of the arrival angle theta and the pitch angle beta are degrees;
the measured value of the azimuth angle α is obtained by: firstly, measuring an arrival angle theta of a signal, then looking up a table 1 according to the arrival angle theta and a pitch angle beta value, when no corresponding angle value exists in the table, performing table look-up calculation by adopting a linear interpolation mode to obtain a correction value, and then correcting the theta by using the correction value to obtain a measurement value of an azimuth angle alpha.
According to a preferred embodiment, when the pitch angle β cannot be obtained directly, from the relationship between the pitch angle β and the ratio of the height difference to the distance:
thereby constructing a second error correction table based on the angle of arrival θ and the height/distance.
According to a preferred embodiment, the second error correction table is: angle of arrival-height/distance correction look-up table, see table 2:
TABLE 2 Angle of arrival-altitude/distance correction lookup table
Wherein the angle of arrival θ is in degrees.
According to a preferred embodiment, based on table 2, the measured value of the azimuth angle α is obtained by: firstly, measuring an arrival angle theta of a signal, then looking up a table 2 according to the arrival angle theta and the height/distance value, when no corresponding angle value exists in the table, performing table look-up calculation by adopting a linear interpolation mode to obtain a correction value, and then correcting the theta by using the correction value to obtain a measurement value of an azimuth angle alpha.
The main scheme and the further selection schemes can be freely combined to form a plurality of schemes which are all adopted and claimed by the invention; in addition, the non-conflict selections can be freely combined. The skilled person in the art can understand that there are many combinations, which are all the technical solutions to be protected by the present invention, according to the prior art and the common general knowledge after understanding the scheme of the present invention, and the technical solutions are not exhaustive herein.
The invention has the beneficial effects that: the invention can not be influenced by the cone effect caused by a large pitch angle, and can improve the accuracy of azimuth direction finding of the one-dimensional interferometer; the invention adopts a table look-up method to correct the direction-finding error without the operation of a trigonometric function, thereby saving the calculation resource.
Drawings
FIG. 1 is a plot of direction finding error caused by cone effect of a one-dimensional interferometer;
FIG. 2 is a schematic block diagram of a direction finding correction method of a one-dimensional interferometer of the present invention;
FIG. 3 is a schematic diagram of a one-dimensional interferometer direction finding;
fig. 4 is a schematic diagram of the cone effect of a one-dimensional interferometer.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations and positional relationships that are conventionally used in the products of the present invention, and are used merely for convenience in describing the present invention and for simplicity in description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
As shown in fig. 2 to 4, the present invention discloses a method for correcting a cone effect of a one-dimensional interferometer, which mainly comprises: firstly, looking up a table according to values of an actually measured signal arrival angle and a pitch angle, if the table has no corresponding value, performing table look-up calculation by adopting a linear interpolation mode to obtain a correction value, and correcting the arrival angle by using the correction value to obtain a measured value of an azimuth angle; and secondly, looking up a table according to actually measured values of the signal arrival angle and the ratio of the height to the distance, if no corresponding value exists in the table, performing table look-up calculation by adopting a linear interpolation mode to obtain a correction value, and correcting the arrival angle by using the correction value to obtain a measured value of the azimuth angle.
Signal pitch angle β: the included angle between the signal arrival line and the antenna visual axis plane; angle of arrival of signal θ: the included angle between the tangent of the signal arrival line cone and the antenna visual axis plane and the antenna array aiming line; azimuth angle α: the projection of the signal arrival line on the antenna visual axis plane forms an included angle with the antenna array aiming line.
Specifically, referring to fig. 3 to 4, based on the direction-finding principle of the one-dimensional interferometer, the signal arrival angle θ is:
wherein, phi is the phase difference of two paths of signals, lambda is the signal wavelength, l is the antenna spacing, and when the incident signal and the antenna visual axis are not in the same plane, the cone effect exists. As shown in fig. 4, the obtained arrival angle θ of the signal is:
θ＝sin-1(sinαcosβ)
the deviation exists between the azimuth angle alpha and the arrival angle theta, so that the obtained azimuth angle is inaccurate, and the correction needs to be carried out.
The correction method comprises the following steps: according to the principle of cone effect, based on the acquired signal pitch angle β and the measured signal arrival angle θ, the correction calculation of the azimuth angle α is completed by the following formula:
α＝sin-1(sinθ/cosβ)。
considering that the above formula is a trigonometric function, a general computer program is not easy to process or the consumption of computing resources is large, and in order to solve the problem, the invention adopts a table look-up mode to carry out error correction.
And constructing a first error correction table based on the relation between the azimuth angle alpha and the pitching angle of view beta and the arrival angle theta, wherein the first error correction table comprises the pitching angle beta, the arrival angle theta and a correction value, and the correction value is the azimuth angle alpha/the arrival angle theta.
The first error correction table is: the arrival angle-pitch angle correction lookup table is shown in table 1:
TABLE 1 Angle of arrival-Pitch correction lookup Table
Wherein the arrival angle theta and the pitch angle beta are in degrees. The measured value of the azimuth angle α is obtained by: firstly, measuring an arrival angle theta of a signal, then looking up a table 1 according to the arrival angle theta and a pitch angle beta value, when no corresponding angle value exists in the table, performing table look-up calculation by adopting a linear interpolation mode to obtain a correction value, and then correcting the theta by using the correction value to obtain a measurement value of an azimuth angle alpha.
In addition, the pitch angle β often cannot be directly obtained according to practical applications.
When the pitch angle beta cannot be directly obtained, according to the relationship between the pitch angle beta and the ratio of the height difference to the distance:
thereby constructing a second error correction table based on the angle of arrival θ and the height/distance.
The second error correction table is: angle of arrival-height/distance correction look-up table, see table 2:
TABLE 2 Angle of arrival-altitude/distance correction lookup table
Wherein the angle of arrival θ is in degrees.
Based on table 2, the procedure for obtaining the measured value of the azimuth angle α is: firstly, measuring an arrival angle theta of a signal, then looking up a table 2 according to the arrival angle theta and the height/distance value, when no corresponding angle value exists in the table, performing table look-up calculation by adopting a linear interpolation mode to obtain a correction value, and then correcting the theta by using the correction value to obtain a measurement value of an azimuth angle alpha.
Therefore, the invention can not be influenced by the cone effect caused by a large pitch angle, and can improve the accuracy of the azimuth direction finding of the one-dimensional interferometer; the invention adopts a table look-up method to correct the direction-finding error without the operation of a trigonometric function, thereby saving the calculation resource.
Examples
If a horizontal one-dimensional interferometer direction-finding array is additionally arranged on an electronic reconnaissance aircraft, the position is 10000m of flight height, and the direction-finding positioning is carried out on an electronic radiation source target on a certain sea surface 50km away from the direction of 45 degrees. The interferometer measures the signal arrival angle 43.90 degrees, estimates the target distance to be about 50km, according to the digital map of the area, the target altitude is about 0m, the ratio of the calculated altitude/distance difference is 0.2, the table 2 is looked up, the correction value obtained according to the linear interpolation mode is 1.13, the azimuth angle is corrected, the final output azimuth angle is 45.03 degrees, and the measurement error is reduced to 0.03 degrees from 1.1 degrees.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. A correction method for cone effect of direction finding of a one-dimensional interferometer is based on the direction finding principle of the one-dimensional interferometer, and the arrival angle theta of a signal is as follows:
wherein phi is phase difference of two paths of signals, lambda is signal wavelength, l is antenna distance, when the incident signal and the antenna visual axis are not in the same plane, a cone effect exists,
the correction method is characterized by comprising the following steps: based on the acquired signal pitch angle β and the measured signal arrival angle θ, the correction calculation of the azimuth angle α is completed by the following formula:
α＝sin-1(sinθ/cosβ)。
2. the correction method according to claim 1, wherein a first error correction table is constructed based on the relationship between the azimuth angle α and the pitch field angle β and the arrival angle θ, and the first error correction table includes the pitch angle β, the arrival angle θ and a correction value, wherein the correction value is the azimuth angle α/the arrival angle θ.
3. The correction method according to claim 2, wherein the first error correction table is: the arrival angle-pitch angle correction lookup table is shown in table 1:
TABLE 1 Angle of arrival-Pitch correction lookup Table
Wherein the units of the arrival angle theta and the pitch angle beta are degrees;
the measured value of the azimuth angle α is obtained by: firstly, measuring an arrival angle theta of a signal, then looking up a table 1 according to the arrival angle theta and a pitch angle beta value, when no corresponding angle value exists in the table, performing table look-up calculation by adopting a linear interpolation mode to obtain a correction value, and then correcting the theta by using the correction value to obtain a measurement value of an azimuth angle alpha.
4. A correction method according to claim 3, characterized in that, when the pitch angle β cannot be obtained directly, from the relationship between the pitch angle β and the ratio of the height difference to the distance:
thereby constructing a second error correction table based on the angle of arrival θ and the height/distance.
5. The correction method according to claim 4, wherein the second error correction table is: angle of arrival-height/distance correction look-up table, see table 2:
TABLE 2 Angle of arrival-altitude/distance correction lookup table
Wherein the angle of arrival θ is in degrees.
6. The calibration method according to claim 5, wherein the measured value of the azimuth angle α is obtained based on table 2 by: firstly, measuring an arrival angle theta of a signal, then looking up a table 2 according to the arrival angle theta and the height/distance value, when no corresponding angle value exists in the table, performing table look-up calculation by adopting a linear interpolation mode to obtain a correction value, and then correcting the theta by using the correction value to obtain a measurement value of an azimuth angle alpha.
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Cited By (4)
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| CN114415107A (en) * | 2022-04-01 | 2022-04-29 | 中国电子科技集团公司第二十九研究所 | Polarization measurement method and system for improving array direction finding precision and storage medium |
| CN114526673A (en) * | 2022-01-07 | 2022-05-24 | 华能巢湖发电有限责任公司 | Method for measuring coal storage of coal yard by reducing errors |
| CN114563756A (en) * | 2022-01-12 | 2022-05-31 | 中国电子科技集团公司第十研究所 | Linear interpolation method for direction finding sample of dual-channel correlation interferometer |
| CN114839587A (en) * | 2022-03-25 | 2022-08-02 | 中国电子科技集团公司第二十九研究所 | External correction method for interferometer system |
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| CN114526673A (en) * | 2022-01-07 | 2022-05-24 | 华能巢湖发电有限责任公司 | Method for measuring coal storage of coal yard by reducing errors |
| CN114563756A (en) * | 2022-01-12 | 2022-05-31 | 中国电子科技集团公司第十研究所 | Linear interpolation method for direction finding sample of dual-channel correlation interferometer |
| CN114839587A (en) * | 2022-03-25 | 2022-08-02 | 中国电子科技集团公司第二十九研究所 | External correction method for interferometer system |
| CN114839587B (en) * | 2022-03-25 | 2023-09-05 | 中国电子科技集团公司第二十九研究所 | External correction method for interferometer system |
| CN114415107A (en) * | 2022-04-01 | 2022-04-29 | 中国电子科技集团公司第二十九研究所 | Polarization measurement method and system for improving array direction finding precision and storage medium |
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