CN109459736B - Radar target design method and device - Google Patents

Radar target design method and device Download PDF

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CN109459736B
CN109459736B CN201910006970.5A CN201910006970A CN109459736B CN 109459736 B CN109459736 B CN 109459736B CN 201910006970 A CN201910006970 A CN 201910006970A CN 109459736 B CN109459736 B CN 109459736B
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rectangular flat
double
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flat plate
station
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CN109459736A (en
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闫华
李焕敏
崔闪
李胜
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Beijing Institute of Environmental Features
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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

Abstract

The invention relates to a radar target design method and a device, wherein one embodiment of the method comprises the following steps: determining the included angle of the two rectangular flat plates according to the double standing angles in the index requirement; establishing a functional relation between a double-station RCS of a non-vertical dihedral angle and an incident azimuth angle as well as the area of a rectangular flat plate; acquiring the area of a rectangular flat plate corresponding to the peak value of the double-station RCS in the index requirement by utilizing the functional relation; and determining the length and the width of the common edge of the rectangular flat plate according to a preset rule and the acquired area of the rectangular flat plate. This embodiment can provide a new strong scatterer suitable for a two-station radar system to replace the conventional radar target.

Description

Radar target design method and device
Technical Field
The invention relates to the technical field of radars, in particular to a method and a device for designing a radar target.
Background
The radar target is based on target characteristics concerned by weapon system search, capture, tracking, confrontation and attack, and is a precondition and basis for weapon system, seeker equipment examination and test identification by approximating and equivalently simulating the target characteristics by a scientific method. The radar target is the smallest component of a radar target system and provides a point scattering property simulation of the target. The actual complex target generally has a multipoint source distribution characteristic, and electromagnetic scattering characteristic simulation of the whole target can be realized through combination of a plurality of radar targets.
Conventional radar targets are designed primarily for single station radar systems, which are typically implemented using scatterers with backward enhancement capability, such as vertical dihedral reflectors, trihedral reflectors, top hat structures, luneberg spheres, and the like. However, for a two-station radar system, the two-station scattering intensity of these strong backscatter targets is greatly reduced and cannot provide sufficient scattering magnitude.
It is therefore desirable to provide new strong scatterers suitable for dual-station radar systems to replace conventional radar targets.
Disclosure of Invention
The technical problem to be solved by the invention is how to provide a new strong scatterer suitable for a two-station radar system to replace the traditional radar target.
In order to solve the above technical problems, in one aspect, the present invention provides a radar target designing method.
The radar target design method provided by the embodiment of the invention is used for determining the non-vertical dihedral corner reflector meeting the index requirement as the target of the double-station radar; wherein the index requirements include: the non-vertical dihedral corner reflector comprises two rectangular flat plates with the same size; the method comprises the following steps: determining the included angle of the two rectangular flat plates according to the double standing angles; establishing a functional relation between a double-station RCS of a non-vertical dihedral angle and an incident azimuth angle as well as the area of a rectangular flat plate; acquiring the area of a rectangular flat plate corresponding to the peak value of the double-station RCS in the index requirement by utilizing the functional relation; and determining the length and the width of the common edge of the rectangular flat plate according to a preset rule and the acquired area of the rectangular flat plate.
Preferably, the determining the included angle of the two rectangular flat plates according to the double standing angles specifically includes: the included angle between the two rectangular flat plates is determined by the following formula:
Figure GDA0002639193850000021
wherein alpha is the included angle of the two rectangular flat plates, and delta phi is a double-station angle in the index requirement.
Preferably, the functional relationship is as shown in the following equation:
Figure GDA0002639193850000022
Figure GDA0002639193850000023
Δφ＝φr-φi
wherein σbisIs a two-station RCS, AeIs the effective area, λ is the electromagnetic wave wavelength, A is the area of the rectangular plate, phiiIs the incident azimuth angle phirTo receive the azimuth.
Preferably, the obtaining of the area of the rectangular flat plate corresponding to the peak value of the dual-station RCS in the index requirement by using the functional relationship specifically includes: and acquiring an expression when the double-station RCS takes the maximum value according to the functional relation, and substituting the double-station RCS peak value in the index requirement into the expression to obtain the rectangular flat plate area corresponding to the double-station RCS peak value.
Preferably, the area of the rectangular plate corresponding to the peak of the dual station RCS is determined according to the following equation:
Figure GDA0002639193850000024
wherein A is0Is the area of the rectangular plate corresponding to the peak of the dual station RCS, σbis,maxIs the dual station RCS peak.
Preferably, the determining, according to a preset rule and the obtained area of the rectangular flat plate, the length and the width of the common edge of the rectangular flat plate specifically include:
the common edge length and width of the rectangular plate are determined using the following equation:
Figure GDA0002639193850000031
wherein L is the length of the common side of the rectangular flat plate, and a is the width of the rectangular flat plate.
In another aspect, the present invention provides a radar target designing apparatus.
The radar target design device provided by the embodiment of the invention can be used for determining the non-vertical dihedral corner reflector meeting the index requirement as the target of the double-station radar; wherein the index requirements include: the non-vertical dihedral corner reflector comprises two rectangular flat plates with the same size; the apparatus may comprise: the included angle calculation unit is used for determining the included angle of the two rectangular flat plates according to the double standing angles; the area calculation unit is used for establishing a functional relation between the double-station RCS of the non-vertical dihedral angle and the incident azimuth angle as well as the area of the rectangular flat plate; acquiring the area of a rectangular flat plate corresponding to the peak value of the double-station RCS in the index requirement by utilizing the functional relation; and the length and width calculating unit is used for determining the length and the width of the common edge of the rectangular flat plate according to a preset rule and the acquired area of the rectangular flat plate.
Preferably, the included angle calculation unit may be further configured to: the included angle between the two rectangular flat plates is determined by the following formula:
Figure GDA0002639193850000032
the area calculation unit may be further operable to: establishing a functional relationship represented by the following formula:
Figure GDA0002639193850000033
Figure GDA0002639193850000034
Δφ＝φr-φi
wherein α is the included angle between two rectangular flat plates, Delta phi is the double standing angle in the index requirement, and sigmabisIs a two-station RCS, AeIs the effective area, λ is the electromagnetic wave wavelength, A is the area of the rectangular plate, phiiIs the incident azimuth angle phirTo receive the azimuth.
Preferably, the area calculation unit may be further configured to: obtaining an expression when the double-station RCS takes the maximum value according to the functional relation, substituting the double-station RCS peak value in the index requirement into the expression to obtain the rectangular flat plate area corresponding to the double-station RCS peak value; and
the area of the rectangular plate corresponding to the peak of the dual station RCS is determined according to the following equation:
Figure GDA0002639193850000041
wherein A is0Is the area of the rectangular plate corresponding to the peak of the dual station RCS, σbis,maxIs the dual station RCS peak.
Preferably, the length and width calculating unit may be further configured to: the common edge length and width of the rectangular plate are determined using the following equation:
Figure GDA0002639193850000042
wherein L is the length of the common side of the rectangular flat plate, and a is the width of the rectangular flat plate.
The technical scheme of the invention has the following advantages: in the embodiment of the invention, a non-vertical dihedral corner reflector is provided as a target of a double-station radar, and the high double-station scattering intensity can be realized, so that the problem that the conventional vertical dihedral corner reflector cannot provide a sufficient magnitude double-station radar scattering Cross section RCS (radar Cross section) is solved. Meanwhile, the invention establishes the functional relation between the double-station RCS and the geometric parameters of the non-vertical dihedral angle structure aiming at the index requirements of the double-station angle, the double-station RCS peak value and the like, shows the design process of the double-station radar target unit, provides the calculation formulas of parameters such as the dihedral angle included angle, the area of the rectangular flat plate, the length and the width of the common edge of the rectangular flat plate and the like, and realizes the simulation of the target double-station RCS under the condition of fixing the double-station angle.
Drawings
FIG. 1 is a schematic diagram of the main steps of a radar target design method according to an embodiment of the present invention;
FIG. 2 is a geometric schematic of a non-vertical dihedral corner reflector according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the principle of secondary specular reflection for a non-vertical dihedral corner reflector in accordance with embodiments of the present invention;
fig. 4 is an RCS curve for a non-vertical dihedral corner reflector according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
FIG. 1 is a schematic diagram of the main steps of a radar target design method according to an embodiment of the present invention, which can be used to determine a non-vertical dihedral corner reflector meeting the specification requirement as a target of a two-station radar; wherein, the index requirements include: the RCS peak (i.e., maximum) and the dual-station angle of the dual-station radar scattering cross-section. It is understood that the index requirement may be a specific value or an order of magnitude, and the technical solution of the present invention will be described below by taking the index requirement as a specific value as an example. The dual station angle refers to the difference between the receiving azimuth angle and the incident azimuth angle in the dual station radar system.
The non-vertical dihedral corner reflector is composed of two rectangular flat plates with the same size. FIG. 2 is a geometric schematic of a non-vertical dihedral corner reflector according to an embodiment of the present invention. As shown in fig. 2, the non-vertical dihedral corner reflector is composed of two rectangular flat plates 1 and 2 with equal size (i.e. equal length and width), both having a common edge with a length L and a width a, and the two rectangular flat plates have an included angle α, which may be an acute angle or an obtuse angle in a specific application.
The radar target design method provided by the embodiment of the invention can be specifically executed according to the following steps:
step S101: and determining the included angle of the two rectangular flat plates according to the double standing angles in the index requirement.
In this step, the included angle of the non-perpendicular dihedral angle can be calculated by using the double standing angles in the index requirement. The geometric relationship of the angles of the non-perpendicular dihedral structure can be as shown in fig. 3. FIG. 3 is a schematic diagram of the principle of secondary specular reflection for a non-vertical dihedral corner reflector of an embodiment of the present invention, where φ in FIG. 3iIs the incident azimuth angle phirTo receive azimuth angle, ΔPhi is a double standing angle in the index requirement,
Figure GDA0002639193850000051
in the direction of incidence of the radar,
Figure GDA0002639193850000061
for the direction of reception of the radar,
Figure GDA0002639193850000062
the angles in fig. 3 are analyzed to obtain the following formula for determining the included angle α between the two rectangular plates:
Figure GDA0002639193850000063
step S102: establishing a functional relation between a double-station RCS of a non-vertical dihedral angle and an incident azimuth angle as well as the area of a rectangular flat plate; and acquiring the area of the rectangular flat plate corresponding to the peak value of the double-station RCS in the index requirement by using the functional relation.
In practical applications, the following two-station RCS formula for non-equilateral dihedral angles can be derived, i.e. the functional relationship can be expressed:
Figure GDA0002639193850000064
Figure GDA0002639193850000065
Δφ＝φr-φi
wherein σbisIs a two-station RCS, AeIs the effective area, λ is the electromagnetic wave wavelength, A is the rectangular plate area, and min is the minimum value.
After the functional relationship is obtained, an expression when the double-station RCS takes the maximum value can be obtained according to the functional relationship, and the double-station RCS peak value in the index requirement is substituted into the expression, so that the rectangular flat plate area corresponding to the double-station RCS peak value is obtained, and the rectangular flat plate area can be determined according to the following formula:
Figure GDA0002639193850000066
wherein A is0Rectangular plate area, σ, for dual station RCS peakbis,maxIs the dual station RCS peak in the index requirement.
Step S103: and determining the length and the width of the common edge of the rectangular flat plate according to a preset rule and the acquired area of the rectangular flat plate.
In the embodiment of the present invention, the rule can be flexibly set according to actual requirements, for example, it can be set as a volume minimization principle, that is, the length and the width of the common edge of the rectangular flat plate are equal, and at this time, the length and the width can be calculated by the following formula:
Figure GDA0002639193850000071
thus, the reflector with the determined non-vertical dihedral angle structure can be obtained to be used as a target of the two-station radar system. Fig. 4 is a RCS curve for a non-vertical dihedral corner reflector according to an embodiment of the present invention, and it can be seen from fig. 4 that the dual-station RCS of the non-vertical dihedral corner reflector can be changed with the incident azimuth. In fig. 4, the abscissa is the incident azimuth, the ordinate is the RCS value (unit is dB square meter), the frequency is 10GHz, the double station angle is 60 °, the polarization mode is VV, the included angle of the rectangular flat plate calculated through the above process is 120 °, the area of the rectangular flat plate is 2.35 square meter, and the length and width of the common edge are both 1.533 meters.
In the embodiment of the invention, the invention further provides a radar target design device, which is used for determining the non-vertical dihedral corner reflector meeting the index requirement as the target of the double-station radar; wherein the index requirements include: the non-vertical dihedral corner reflector comprises two rectangular flat plates with the same size; the apparatus may comprise: the included angle calculation unit can be used for determining the included angle of the two rectangular flat plates according to the double standing angles; the area calculation unit can be used for establishing a functional relation between the double-station RCS of the non-vertical dihedral angle and the incident azimuth angle as well as the area of the rectangular flat plate; acquiring the area of a rectangular flat plate corresponding to the peak value of the double-station RCS in the index requirement by utilizing the functional relation; the length and width calculating unit can be used for determining the length and the width of the common edge of the rectangular flat plate according to a preset rule and the acquired area of the rectangular flat plate.
Preferably, the included angle calculating unit is further configured to: the included angle between the two rectangular flat plates is determined by the following formula:
Figure GDA0002639193850000072
the area calculation unit may be further operable to: establishing a functional relationship represented by the following formula:
Figure GDA0002639193850000081
Figure GDA0002639193850000082
Δφ＝φr-φi
wherein α is the included angle between two rectangular flat plates, Delta phi is the double standing angle in the index requirement, and sigmabisIs a two-station RCS, AeIs the effective area, λ is the electromagnetic wave wavelength, A is the area of the rectangular plate, phiiIs the incident azimuth angle phirTo receive the azimuth.
As a preferred solution, the area calculating unit may be further configured to: obtaining an expression when the double-station RCS takes the maximum value according to the functional relation, substituting the double-station RCS peak value in the index requirement into the expression to obtain the rectangular flat plate area corresponding to the double-station RCS peak value;
the area of the rectangular plate corresponding to the peak of the dual station RCS is determined according to the following equation:
Figure GDA0002639193850000083
wherein A is0Is a rectangular flat plate corresponding to the peak value of the dual-station RCSArea, σbis,maxIs the dual station RCS peak.
Furthermore, in an embodiment of the present invention, the length and width calculating unit may be further configured to: the common edge length and width of the rectangular plate are determined using the following equation:
Figure GDA0002639193850000084
wherein L is the length of the common side of the rectangular flat plate, and a is the width of the rectangular flat plate.
In summary, in the technical solution of the embodiment of the present invention, a non-vertical dihedral corner reflector is provided as a target of a dual-station radar, so that a large dual-station scattering intensity can be achieved, and a problem that a conventional vertical dihedral corner reflector cannot provide a sufficient magnitude of dual-station RCS is solved. Meanwhile, the invention establishes the functional relation between the double-station RCS and the geometric parameters of the non-vertical dihedral angle structure aiming at the index requirements of the double-station angle, the double-station RCS peak value and the like, shows the design process of the double-station radar target unit, provides the calculation formulas of parameters such as the dihedral angle included angle, the area of the rectangular flat plate, the length and the width of the common edge of the rectangular flat plate and the like, and realizes the simulation of the target double-station RCS under the condition of fixing the double-station angle.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A radar target design method is used for determining a non-vertical dihedral corner reflector meeting index requirements as a target of a double-station radar; wherein the index requirements include: the non-vertical dihedral corner reflector comprises two rectangular flat plates with the same size; characterized in that the method comprises:
determining the included angle of the two rectangular flat plates according to the double standing angles;
establishing a functional relation between a double-station RCS of a non-vertical dihedral angle and an incident azimuth angle as well as the area of a rectangular flat plate; acquiring the area of a rectangular flat plate corresponding to the peak value of the double-station RCS in the index requirement by utilizing the functional relation; and
and determining the length and the width of the common edge of the rectangular flat plate according to a preset rule and the acquired area of the rectangular flat plate.
2. The method according to claim 1, wherein determining an included angle between two rectangular flat plates according to the double standing angles specifically comprises:
the included angle between the two rectangular flat plates is determined by the following formula:
Figure FDA0002560294970000011
wherein alpha is the included angle of the two rectangular flat plates, and delta phi is a double-station angle in the index requirement.
3. The method of claim 2, wherein the functional relationship is represented by the following equation:
Figure FDA0002560294970000012
Figure FDA0002560294970000013
Δφ＝φr-φi
wherein σbisIs a two-station RCS, AeIs the effective area, λ is the electromagnetic wave wavelength, A is the area of the rectangular plate, phiiIs the incident azimuth angle phirTo receive the azimuth.
4. The method according to claim 3, wherein the obtaining the rectangular plate area corresponding to the peak of the dual-station RCS in the index requirement by using the functional relationship specifically comprises:
and acquiring an expression when the double-station RCS takes the maximum value according to the functional relation, and substituting the double-station RCS peak value in the index requirement into the expression to obtain the rectangular flat plate area corresponding to the double-station RCS peak value.
5. The method of claim 4, wherein the rectangular plate area corresponding to the peak of the dual station RCS is determined according to the following equation:
Figure FDA0002560294970000021
wherein A is0Is the area of the rectangular plate corresponding to the peak of the dual station RCS, σbis,maxIs the dual station RCS peak.
6. The method according to claim 5, wherein the determining the length and the width of the common edge of the rectangular flat plate according to the preset rule and the obtained area of the rectangular flat plate specifically comprises:
the common edge length and width of the rectangular plate are determined using the following equation:
Figure FDA0002560294970000022
wherein L is the length of the common side of the rectangular flat plate, and a is the width of the rectangular flat plate.
7. A radar target design device is used for determining a non-vertical dihedral corner reflector meeting index requirements as a target of a double-station radar; wherein the index requirements include: the non-vertical dihedral corner reflector comprises two rectangular flat plates with the same size; characterized in that the device comprises:
the included angle calculation unit is used for determining the included angle of the two rectangular flat plates according to the double standing angles;
the area calculation unit is used for establishing a functional relation between the double-station RCS of the non-vertical dihedral angle and the incident azimuth angle as well as the area of the rectangular flat plate; acquiring the area of a rectangular flat plate corresponding to the peak value of the double-station RCS in the index requirement by utilizing the functional relation; and
and the length and width calculating unit is used for determining the length and the width of the common edge of the rectangular flat plate according to a preset rule and the acquired area of the rectangular flat plate.
8. The apparatus of claim 7,
the included angle calculation unit is further configured to: the included angle between the two rectangular flat plates is determined by the following formula:
Figure FDA0002560294970000031
the area calculation unit is further configured to: establishing a functional relationship represented by the following formula:
Figure FDA0002560294970000032
Figure FDA0002560294970000033
Δφ＝φr-φi
wherein α is the included angle between two rectangular flat plates, Delta phi is the double standing angle in the index requirement, and sigmabis is a double station RCS, AeIs the effective area, λ is the electromagnetic wave wavelength, A is the area of the rectangular plate, phiiIs the incident azimuth angle phirTo receive the azimuth.
9. The apparatus of claim 8,
the area calculation unit is further configured to: obtaining an expression when the double-station RCS takes the maximum value according to the functional relation, substituting the double-station RCS peak value in the index requirement into the expression to obtain the rectangular flat plate area corresponding to the double-station RCS peak value; and
the area of the rectangular plate corresponding to the peak of the dual station RCS is determined according to the following equation:
Figure FDA0002560294970000041
wherein A is0Is the area of the rectangular plate corresponding to the peak of the dual station RCS, σbis,maxIs the dual station RCS peak.
10. The apparatus of claim 9, wherein the length and width calculating unit is further configured to: the common edge length and width of the rectangular plate are determined using the following equation:
Figure FDA0002560294970000042
wherein L is the length of the common side of the rectangular flat plate, and a is the width of the rectangular flat plate.
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