CN108919209B - Test platform for underwater acoustic simulation measurement of full-angle electromagnetic scattering characteristics of water surface target - Google Patents
Test platform for underwater acoustic simulation measurement of full-angle electromagnetic scattering characteristics of water surface target Download PDFInfo
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- CN108919209B CN108919209B CN201810497422.2A CN201810497422A CN108919209B CN 108919209 B CN108919209 B CN 108919209B CN 201810497422 A CN201810497422 A CN 201810497422A CN 108919209 B CN108919209 B CN 108919209B
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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
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Abstract
The invention relates to the field of radar target scattering characteristic testing, in particular to a test platform for measuring full-angle electromagnetic scattering characteristics of a water surface target through underwater sound simulation. The test platform comprises an instrument platform, a target suspension device, a wave generating device, an underwater vertical rotating device, a driving device and an underwater launching platform, wherein the instrument platform, the target suspension device, the wave generating device and the driving device are all arranged on the water surface, and the underwater vertical rotating device and the underwater launching platform are arranged below the water surface; the water surface target scaling model suspended on the target suspension device can rotate by 0-360 degrees, and the underwater vertical rotating device can rotate by 0-90 degrees. The test platform considers the influence of water surface fluctuation on the measurement of the radar scattering characteristics of the water surface target, can measure the radar scattering characteristics of the water surface target at a large incidence residual angle, considers the measurement requirement at a small incidence residual angle, and can measure and obtain the electromagnetic scattering characteristics of the water surface target at a full angle (a horizontal azimuth angle of 0-360 degrees and an incidence residual angle of 0-90 degrees).
Description
Technical Field
The invention relates to the field of radar target scattering characteristic testing, in particular to a test platform for measuring full-angle electromagnetic scattering characteristics of a water surface target through underwater sound simulation.
Background
The incidence complementary angle of radar waves when the shore-sea radar and the ship-borne radar are incident on a water surface or an aerial target is usually less than 3 degrees, but the incidence complementary angle of the radar waves emitted by a satellite-borne radar, an airborne radar, an anti-ship missile seeker and the like when the radar waves reach the target may be more than 3 degrees, such as: a maneuvering ballistic mode is generally adopted by a new generation of anti-ship missiles, the anti-ship missiles usually fly to approach a water surface target by sea skimming, jump when attacking the tail section and then dive to attack the water surface target. Therefore, research needs to be carried out on the radar scattering characteristics of the water surface target at a large incidence complementary angle.
The method for acquiring the electromagnetic scattering characteristics of the water surface target comprises two ways of theoretical calculation and test, and the test environment is difficult to accurately model during the theoretical calculation, so that calculation errors are caused. Currently, there are three methods for experimentally measuring the scattering characteristics of a water surface target: firstly, the external field actual measurement method has the defects that the required measurement field and target are difficult to meet, the measurement can only be carried out after the water surface target is built, the pointed appearance optimization suggestion cannot be provided for designers at the beginning of design, and the investment of capital, manpower and material resources is very large; the microwave darkroom method is a traditional method for measuring the electromagnetic scattering property of a water surface target in a current laboratory, and has the defects that firstly, for a large-size target such as a ship, the requirement on the working frequency of test testing equipment is very high, the realization is difficult, secondly, a fluctuating sea surface environment which has great influence on the measurement of the electromagnetic scattering property of the water surface target cannot be constructed, and the capital investment of the infrastructure of the method is very large; thirdly, an underwater acoustic simulation method is based on the similarity principle of acoustic waves and electromagnetic waves in target scattering, air-seawater reciprocity is carried out, a scale model of a water surface target scale model is placed below a near water surface, the scale model is irradiated by ultrahigh frequency acoustic signals meeting the similarity principle and optical scattering conditions, target radar echoes including scattering influences of a water surface interface are obtained, and the scattering characteristics of the water surface target when the water surface fluctuates are simulated and measured. At present, a test platform for measuring the electromagnetic scattering property of a water surface target through underwater acoustic simulation can only meet the condition that the incident complementary angle is less than 3 degrees.
Disclosure of Invention
In order to solve the problems, the invention provides the underwater acoustic simulation test platform for measuring the full-angle electromagnetic scattering characteristics of the water surface target, which is simple to operate and high in test efficiency.
The technical scheme adopted by the invention is as follows: the utility model provides an underwater acoustic analogue measurement surface of water target full angle electromagnetic scattering characteristic test platform, includes the instrument platform that is used for putting instrument equipment, is used for hanging the target linkage of surface of water target scaling model, is used for simulating the ripples device of making of surface of water stormy waves, vertical rotary device under water, is used for driving vertical rotary device pivoted drive arrangement under water and sets up the launching platform under water on vertical rotary device under water, its characterized in that: the instrument platform, the target suspension device, the wave generating device and the driving equipment are all arranged on the water surface, and the underwater vertical rotating device and the underwater launching platform are arranged below the water surface; the scale model of the water surface target suspended on the target suspension device can rotate 360 degrees in the horizontal direction, and the transducer on the underwater launching platform can rotate 360 degrees.
Preferably, the instrument platform comprises a platform bottom plate and a platform fixing frame, wherein the platform bottom plate is used for placing instrument equipment and also serves as a working place for personnel, and the platform fixing frame is used for fixing the platform bottom plate.
Furthermore, the target suspension device comprises a suspension bracket bottom plate, a dial plate bottom plate, a suspension bracket, a horizontal position dial plate, a rotating component, an adjusting nut and a target suspension rod, wherein the suspension bracket bottom plate is fixedly arranged on longitudinal beams at two sides of the platform bottom plate, so that the target suspension device and the instrument platform are integrally separated; the dial bottom plate is fixedly installed on the suspension support bottom plate through a suspension support, a horizontal position dial is arranged in the center of the dial bottom plate, the lower end of the rotating component penetrates through the horizontal position dial and is connected with the upper end of a target suspension rod through an adjusting nut, and a water surface target scaling model is suspended at the lower end of the target suspension rod; the rotating part can be driven to rotate by a motor, the water surface target scaling model is driven to rotate by the target suspension rod, and a pointer on the rotating part corresponds to the angle scale of the horizontal azimuth dial to indicate the horizontal azimuth angle of the water surface target scaling model.
Furthermore, the lower end of the suspension bracket is fixed with the suspension bracket bottom plate, the upper end of the suspension bracket is connected with the dial plate bottom plate through threads on the suspension bracket, and the upper nut and the lower nut on each suspension bracket on four feet of the dial plate bottom plate are adjusted to keep the dial plate horizontal, so that the scale model waterline of the water surface target scale in the water is ensured to be flush with the water surface, and the air target immersed in the water is kept horizontal with the water surface.
Preferably, the wave generating device comprises a fixed frame fixedly arranged and a fan arranged on the fixed frame, and the wind speed and the pitch angle of the fan are adjustable and are used for simulating water surface waves with different wind speeds and wind directions.
Furthermore, the underwater vertical rotating device comprises a rotating frame, the tops of two sides of the rotating frame are respectively hinged with two sides of the platform bottom plate, an underwater launching platform is arranged in the middle of the bottom, and a dial and a pointer for indicating a rotating angle are arranged on the side surface of the underwater launching platform; one side of the bottom of the rotating frame is connected with a driving device through a pull rope, and the driving device drives the rotating frame to rotate in a range of 0-90 degrees around hinge points on two sides through the pull rope.
Furthermore, the rotating frame comprises a connecting frame arranged on the side surface and a supporting frame arranged at the bottom, the connecting frame is arranged in a triangular shape, the supporting frame is arranged in a rectangular shape, the top end of the connecting frame arranged in the triangular shape is hinged to the platform bottom plate, the bottom end of the connecting frame is fixedly connected to the short edge of the supporting frame arranged in the rectangular shape, an underwater launching platform is arranged in the middle of the supporting frame, and the long edge of the supporting frame is connected with the driving device through a pull rope; the connecting frame is provided with a supporting rod which is used for reinforcing and obliquely arranged, and an oblique design is adopted for preventing sound waves emitted by the underwater transducer from being incident on the supporting rod, so that echo waves are generated to influence a test result.
Furthermore, the underwater launching platform comprises a transducer steering scale plate arranged at the bottom of the rotating frame, a launching platform support, an adjusting support, a transducer mounting frame, laser equipment and a transducer, wherein the transducer steering scale plate is horizontally arranged on the launching platform support through the adjusting support, and the transducer mounting frame is arranged in the middle of the transducer steering scale plate; the laser equipment is installed on the transducer installation frame and used for debugging the centering of the transducer and the water surface target scaling model center on the transducer installation frame, and the laser equipment is detached after debugging and installed on the transducer installation frame.
Preferably, the driving device comprises a fixed frame fixedly arranged on the water surface and a winch arranged on the fixed frame, wherein the winch is connected with the underwater vertical rotating device through a pull rope and is used for driving the underwater vertical rotating device and the underwater launching platform so as to change a complementary angle of the energy converter incident to the water surface target; the variable-speed motor can be used for driving, when the incidence complementary angle is changed in a large angle, the high-speed driving is used, the testing efficiency is improved, and when the incidence complementary angle is adjusted in a small angle, the low-speed driving is used, so that the adjusting precision is ensured.
The beneficial effects obtained by the invention are as follows:
1. the test platform adopts the wind-making device to generate waves, fully considers the influence of water surface fluctuation on the measurement of the scattering characteristics of the water surface target, provides test conditions which are more in line with the actual marine environment, and can simulate and measure the electromagnetic scattering characteristics of the water surface target under laboratory conditions;
2. the full-angle electromagnetic scattering characteristic of the water surface target can be simulated and measured, namely the azimuth angle of the target covers 0-360 degrees, and the incidence residual angle covers 0-90 degrees;
3. the motors with different speeds are comprehensively used for driving the winch to drive the underwater rotating device and the underwater launching platform, so that time and labor are saved, and the incident complementary angle is accurately controlled;
4. the test platform has compact structure, complete functions and convenient control, and is lower in manufacturing cost compared with other methods for measuring the radar scattering characteristics of the water surface target at present.
5. The invention has simple and practical structural design and simple and convenient operation, greatly reduces the influence of people and environment on the test, can simulate and measure the full-angle scattering characteristic of the water surface target when the influence of wind waves is considered, and has greater popularization value.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an exploded view of the target suspension arrangement;
FIG. 3 is an exploded view of an underwater launch platform;
FIG. 4 is a particular embodiment of a water surface target scaling model;
FIG. 5 is a mean range profile of the experiment;
FIG. 6 is a simulated target range profile.
Detailed Description
The invention will be further described with reference to the following drawings and specific embodiments.
As shown in fig. 1, the test platform for underwater acoustic simulation measurement of full-angle electromagnetic scattering properties of a water surface target of the present invention comprises an instrument platform for placing instrument equipment, a target suspension device for suspending a scale model 27 of the water surface target, a wave generating device for simulating water surface storms, an underwater vertical rotating device, a driving device for driving the underwater vertical rotating device to rotate, and an underwater launching platform arranged on the underwater vertical rotating device, wherein the instrument platform, the target suspension device, the wave generating device and the driving device are all arranged on the water surface, and the underwater vertical rotating device and the underwater launching platform are arranged under the water surface; the water surface target scaling model 27 suspended on the target suspension device can rotate 360 degrees in the horizontal direction, so that the full-angle electromagnetic scattering characteristic of the water surface target scaling model can be simulated and measured.
In this embodiment, the instrument platform includes a platform bottom plate 12 and a platform fixing frame 11, the platform fixing frame 11 is fixed on the measuring travelling crane, and the up-down position can be changed as required; the platform bottom plate 12 is fixed through a plurality of platform fixing frames 11, so that stability and firmness of the platform bottom plate are guaranteed, and the platform bottom plate 12 is used for placing instruments and equipment and is also used as a working place for personnel.
Referring to fig. 2, in the present embodiment, the target suspension device includes a suspension bracket bottom plate 28, a dial bottom plate 21, a suspension bracket 22, a horizontal direction dial 23, a rotating member 24, an adjusting nut 25, and a target suspension rod 26, and the suspension bracket bottom plate 28 is fixedly disposed on a longitudinal beam on the side of the platform bottom plate 12, so that the target suspension device is integrally separated from the instrument platform, and the influence on the test result due to the movement of personnel on the platform bottom plate 12 is avoided. The dial bottom plate 21 is fixedly installed on a suspension bracket bottom plate 28 through a suspension bracket 22, four feet of the dial bottom plate 21 are supported by the suspension bracket 22, a horizontal position dial 23 is arranged at the center of the dial bottom plate 21, the lower end of a rotating component 24 penetrates through the horizontal position dial 23 and is connected with the upper end of a target suspension rod 26 through an adjusting nut 25, and a water surface target scaling model 27 is fixedly suspended at the lower end of the target suspension rod 26; the motor drives the rotating part 24 to rotate, the water surface target scaling model 27 is driven to rotate in a full angle range of 360 degrees through the target suspension rod 26, and the pointer on the rotating part 24 corresponds to the angle scale of the horizontal azimuth dial 23 to indicate the current rotating azimuth angle of the water surface target scaling model 27.
In one embodiment, the lower end of the suspension bracket 22 is fixed with the suspension bracket bottom plate 28, the upper end of the suspension bracket is connected with the dial bottom plate 21 through threads on the suspension bracket, and the upper nut and the lower nut on each suspension bracket 22 of the four legs of the dial bottom plate 21 are adjusted to keep the dial bottom plate 21 horizontal, so that a water surface target scale model waterline which is placed in the water in a falling mode is flush with the water surface, and an aerial target which is immersed in the water is kept horizontal with the water surface.
In this embodiment, the wave generating device includes a fixing frame 41 and a fan 42, the fan 42 is mounted on the fixing frame 41, and the wind speed and the pitch angle of the fan 42 can be adjusted according to the actual wind wave requirement, so as to meet the simulation requirements of wind waves with different wind forces (wind speeds) in different directions.
Referring to fig. 3, in this embodiment, the underwater vertical rotation device includes a rotation frame, the tops of two sides of the rotation frame are respectively hinged to two sides of the platform bottom plate 12, an underwater launching platform is disposed in the middle of the bottom, and a dial and a pointer for indicating a rotation angle are disposed on the side surface of the rotation frame, so as to observe and indicate the incident complementary angle of the underwater transducer array to the water surface target; one side of the bottom of the rotating frame is connected with a driving device through a pull rope, and the driving device drives the rotating frame to rotate in a range of 0-90 degrees around hinged points on two sides through the pull rope 7 so as to simulate an incident complementary angle of radar waves to a target in a range of 0-90 degrees.
In one embodiment, the rotating frame is similar to a swing structure and comprises a connecting frame 31 (equivalent to a swing arm of the swing) and a supporting frame 32 (equivalent to a bottom plate of the swing) which are symmetrically arranged on the side surface and arranged on the bottom, wherein the connecting frame 31 is arranged in a triangular shape, the supporting frame 32 is arranged in a rectangular shape, the top end of the connecting frame 31 arranged in the triangular shape is hinged on the platform bottom plate 12, the bottom end of the connecting frame 31 is fixedly connected to the short side of the supporting frame 32 arranged in the rectangular shape, an underwater launching platform is arranged in the middle of the supporting frame 32, and the long side of the supporting frame 32 is connected with a; the connecting frame 31 is provided with the supporting rod 33 which is used for reinforcing and obliquely arranged, the supporting rod 33 adopts an oblique design, the structural strength of the connecting frame 31 can be increased, and the phenomenon that the emitted sound waves are incident on the supporting rod 33 to generate reflection can be avoided, so that the problem that the echo waves influence the test result is generated.
In this embodiment, the transmitting platform includes a transmitting platform support 52, a transducer turning scale plate 51, a transducer mounting bracket 54, a laser device and a transducer, the transmitting platform support 52 is disposed in the middle of the bottom of the support frame 32 of the swivel mount, the transducer turning scale plate 51 is horizontally disposed on the transmitting platform support 52 through an adjusting support 53, and the transducer mounting bracket 54 is disposed in the middle of the transducer turning scale plate 51. Before the transducer is installed, the laser equipment is installed on the transducer installation frame 54, the posture of the laser equipment is adjusted through the adjusting support 53, so that the light beam of the laser equipment is aligned to the center of the water surface target scaling model 27, and the purpose of adjusting the sound wave to be aligned to the center of the target is achieved; after commissioning, the laser device is removed and the transducer is mounted on the transducer mounting bracket 54 for testing.
In one embodiment, the driving device comprises a fixed frame 61 and a winch 62, the winch 62 is installed on the fixed frame 61, and the winch 62 is connected with the supporting frame 32 through a pull rope 7 and is used for driving the underwater vertical rotating device and the underwater launching platform so as to change the complementary angle of the transducer incident to the water surface target; the variable-speed motor is adopted for driving, when the incidence complementary angle is changed in a large angle, the rapid driving is adopted, the test efficiency is improved, and when the incidence complementary angle is adjusted in a small angle, the slow driving is adopted, so that the adjustment precision is ensured. Meanwhile, in order to meet the requirements of some special tests, manual driving can be adopted.
As shown in fig. 4, in one embodiment: the test platform of the invention is utilized to carry out a radar one-dimensional distance image underwater sound simulation measurement test on a water surface target in a pool, the target is a simplified ship model (see figure 4), the model is made of metal, the target is placed under the water surface in an inverted mode, so that an underwater sound receiving and transmitting transducer emits linear frequency modulation signals with the central frequency of 2MHz, the bandwidth of 200kHz and the pulse width of 1ms to the target at an incident complementary angle of 2.44 degrees with the water surface, a fan is adopted to generate waves so as to simulate the wave fluctuation of the actual water surface, the water surface is disturbed to generate a random multipath propagation sound field, and the target is enabled to generate swing.
Fig. 5 and 6 are graphs comparing the underwater acoustic simulation average measurement result and the one-dimensional range profile modeling simulation result when the angle between the incident acoustic wave and the stern is 180 °, and it can be seen from the final test one-dimensional range profile data that 4 obvious peak values exist in the target echo, which correspond to the stern flat plate 271, the rear dihedral angle 272, the middle sphere 273, and the front dihedral angle 274 of the target, respectively, and the consistency of the test measurement result and the theoretical simulation result is good. The results of fig. 5 illustrate that the underwater acoustic simulation method for measuring the one-dimensional distance image of the water surface target is feasible, and the practicability of the test platform designed by the invention is also proved.
The foregoing shows and describes the general principles and principal structural features of the present invention. The present invention is not limited to the above examples, and various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The utility model provides an underwater acoustic analogue measurement surface of water target full angle electromagnetic scattering characteristic test platform, is including the instrument platform that is used for putting instrument equipment, the target linkage that is used for hanging surface of water target scaling model (27), the ripples device of making that is used for simulating surface of water stormy waves, vertical rotary device under water, be used for driving vertical rotary device pivoted drive arrangement under water and set up the launching platform under water on vertical rotary device under water, its characterized in that: the instrument platform, the target suspension device, the wave generating device and the driving equipment are all arranged on the water surface, and the underwater vertical rotating device and the underwater launching platform are arranged below the water surface; the water surface target scaling model (27) suspended on the target suspension device can rotate 360 degrees in the horizontal direction;
the instrument platform comprises a platform bottom plate (12) used for placing instrument and equipment and also used as a working place for personnel, and a platform fixing frame (11) used for fixing the platform bottom plate (12);
the underwater vertical rotating device comprises a rotating frame, the tops of two sides of the rotating frame are respectively hinged with two sides of a platform bottom plate (12), an underwater launching platform is arranged in the middle of the bottom, and a dial and a pointer for indicating a rotating angle are arranged on the side surface of the underwater vertical rotating device; one side of the bottom of the rotating frame is connected with driving equipment through a pull rope (7), and the driving equipment drives the rotating frame to rotate in a range of 0-90 degrees around hinge points on two sides through the pull rope (7).
2. The underwater acoustic simulation measurement test platform for full-angle electromagnetic scattering properties of the water surface target according to claim 1, characterized in that: the target suspension device comprises a suspension bracket bottom plate (28), a dial plate bottom plate (21), a suspension bracket (22), a horizontal position dial plate (23), a rotating component (24), an adjusting nut (25) and a target suspension rod (26), wherein the suspension bracket bottom plate (28) is fixedly arranged on longitudinal beams on two sides of the platform bottom plate (12) so that the target suspension device and the instrument platform are integrally separated; the dial bottom plate (21) is fixedly installed on a suspension bracket bottom plate (28) through a suspension bracket (22), a horizontal azimuth dial (23) is arranged in the center of the dial bottom plate (21), the lower end of the rotating component (24) penetrates through the horizontal azimuth dial (23) and is connected with the upper end of a target suspension rod (26) through an adjusting nut (25), and a water surface target scaling model (27) is suspended at the lower end of the target suspension rod (26); when the rotating component (24) rotates, the water surface target scaling model (27) is driven to rotate through the target suspension rod (26), and the pointer on the rotating component (24) corresponds to the angle scale of the horizontal azimuth dial (23) to indicate the horizontal azimuth angle of the water surface target scaling model (27).
3. The underwater acoustic simulation measurement test platform for full-angle electromagnetic scattering properties of the water surface target according to claim 2, characterized in that: the lower end of the suspension bracket (22) is fixed with a suspension bracket bottom plate (28), the upper end of the suspension bracket is connected with the dial plate bottom plate (21) through threads on the suspension bracket (22), and the upper nut and the lower nut on each suspension bracket (22) on four legs of the dial plate bottom plate (21) are adjusted to keep the dial plate bottom plate (21) horizontal, so that a water surface target scaling model waterline which is arranged in water in a toppled mode is enabled to be flush with the water surface.
4. The underwater acoustic simulation measurement test platform for full-angle electromagnetic scattering properties of the water surface target according to claim 1, characterized in that: the wave generating device comprises a fixed frame (41) and a fan (42), wherein the fixed frame (41) is fixedly arranged, the fan (42) is installed on the fixed frame (41), and the wind speed and the pitch angle of the fan (42) are adjustable and are used for simulating water surface waves with different wind speeds and wind directions.
5. The underwater acoustic simulation measurement test platform for full-angle electromagnetic scattering properties of the water surface target according to claim 1, characterized in that: the rotary frame comprises a connecting frame (31) arranged on the side surface and a supporting frame (32) arranged at the bottom, the connecting frame (31) is arranged in a triangular mode, the supporting frame (32) is arranged in a rectangular mode, the top end of the connecting frame (31) arranged in the triangular mode is hinged to the platform bottom plate (12), the bottom end of the connecting frame is fixedly connected to the short side of the supporting frame (32) arranged in the rectangular mode, an underwater launching platform is arranged in the middle of the supporting frame (32), and the long side of the supporting frame (32) is connected with a driving device through a pull rope (7); and a supporting rod (33) which is used for reinforcing and obliquely arranged is arranged on the connecting frame (31).
6. The underwater acoustic simulation measurement test platform for full-angle electromagnetic scattering properties of the water surface target according to claim 1, characterized in that: the underwater launching platform comprises a transducer steering scale plate (51) arranged at the bottom of a rotating frame, a launching platform support (52), an adjusting support (53), a transducer mounting frame (54), laser equipment and a transducer, wherein the transducer steering scale plate (51) is horizontally arranged on the launching platform support (52) through the adjusting support (53), and the transducer mounting frame (54) is arranged in the middle of the transducer steering scale plate (51); the laser equipment is installed on the transducer installation frame (54) and used for debugging the alignment of the transducer on the transducer installation frame (54) and the center of the water surface target scaling model, the laser equipment is detached after debugging, and the transducer is installed on the transducer installation frame (54).
7. The underwater acoustic simulation measurement test platform for full-angle electromagnetic scattering properties of the water surface target according to claim 1, characterized in that: the driving device comprises a fixed frame (61) fixedly arranged on the water surface and a winch (62) arranged on the fixed frame (61), wherein the winch (62) is connected with the underwater vertical rotating device through a pull rope (7) and is used for driving the underwater vertical rotating device and the underwater launching platform so as to change the complementary angle of the energy converter incident to the water surface target.
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| CN112611921B (en) * | 2020-12-09 | 2022-12-23 | 上海无线电设备研究所 | Atmospheric sound field simulation device and electromagnetic scattering characteristic test method thereof |
| CN113848034B (en) * | 2021-08-26 | 2022-07-08 | 哈尔滨工程大学 | Centrifuge scaling test device and method for simulating deep sea underwater launching |
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