A high-temperature-resistant and high-pressure-resistant embedded waveguide opening antenna applied to roll angle measurement

Abstract

The application discloses a high-temperature and high-pressure resistant embedded waveguide opening antenna applied to roll angle measurement and belongs to the technical field of microwave antennas. The waveguide opening antenna and the socket plate are fastened in the tail of informationization ammunition through screws, and the antenna cover can withstand the high-temperature and high-pressure environmental conditions generated in the instant of ammunition launching. In the roll process of the ammunition, Ka-band linear polarization radio frequency signals are received by the waveguide opening antenna in equal amplitude and in phase, and then the signals are processed by a receiving system and a decoding processing system, so that the roll angle of the ammunition is calculated.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of microwave antennas, and particularly relates to a high-temperature and high-pressure embedded waveguide opening antenna applied to roll angle measurement. BACKGROUND

[0002] Information ammunition is ammunition capable of completing trajectory control through information acquisition and transmission, and efficiently realizing hitting, damage or information confrontation. After being launched, the information ammunition usually rotates to fly forward, receives a correction instruction sent by a guidance radar, combines with roll angle information of the information ammunition to perform trajectory correction, and continuously controls a rudder to fly to a target. The key of flight control lies in real-time reception of the instruction of the guidance radar and real-time measurement of the roll angle of the ammunition, wherein the roll angle measurement is the basis of flight control of the information ammunition, and measurement precision will directly affect hitting precision of the guided shell.

[0003] The roll angle measurement of the prior art relies on a gyroscope, GPS and geomagnetism. The gyroscope produces a large accumulated error in the roll process of the ammunition, and cannot work independently for a long time. The GPS has a low data rate, is prone to interference or shielding, and has a long initialization time. The geomagnetism has a measurement blind area and is prone to interference. The roll angle measurement methods of the prior art cannot solve the problem of roll angle measurement of the information ammunition. SUMMARY

[0004] The application aims to overcome the defects of the prior art, and provides a high-temperature and high-pressure embedded waveguide opening antenna applied to roll angle measurement.

[0005] The technical problem of the application is solved in the following manner:

[0006] A high-temperature and high-pressure embedded waveguide opening antenna applied to roll angle measurement comprises a radome 1, a waveguide opening antenna 2, a socket plate 3 and a radio frequency connector 4 which are connected in sequence and are fixedly installed at a tail of information ammunition.

[0007] The radome 1 is a cylinder, and a circular blind groove is formed at the bottom of the radome 1 as an assembly hole, which is used for bonding the radome 1 to the waveguide opening antenna 2.

[0008] The waveguide opening antenna 2 comprises an outer shell and an inner cavity structure located in the outer shell.

[0009] The outer shell is a two-stage cylinder which is connected in sequence. The cylinder adjacent to the radome 1 is marked as a first-stage cylinder, the diameter of the first-stage cylinder is smaller than that of a second-stage cylinder, four rectangular blind grooves are formed in the outer wall of the second-stage cylinder, and the rectangular blind grooves are used for positioning between the waveguide opening antenna 2 and the information ammunition. A plurality of screw hole positions are arranged at the bottom of the second-stage cylinder.

[0010] The inner cavity structure comprises two coaxial-waveguide antennas and a partition plate, the two coaxial-waveguide antennas are separated by the partition plate; the two coaxial-waveguide antennas are structurally identical, and each comprises a waveguide and a stepped waveguide-coaxial conversion structure connected in sequence, and a blind hole is formed on the first step of the stepped waveguide-coaxial conversion structure;

[0011] The socket plate 3 is perforated at the screw hole position of the bottom of the second-stage cylinder and the blind hole of the first step, and the antenna is inlaid and fastened at the tail of the informationized ammunition through the screw hole position of the socket plate 3 and the second-stage cylinder; one end of the radio frequency connector 4 is inserted into the blind hole of the first step through the perforation of the socket plate 3, and the other end is an SSMP-J interface.

[0012] Further, the specific way of measuring the roll angle of the informationized ammunition by using the above antenna is as follows:

[0013] The electromagnetic wave emitted by the guidance radar is horizontally polarized, the roll angle of the ammunition is denoted as α, and the included angle between the trajectory tangent and the pointing direction of the guidance radar is θ; the two coaxial-waveguide antennas in the waveguide opening antenna 2 are denoted as antenna A and antenna B respectively, and the phase difference of the wave front reaching the antenna A and the antenna B is wherein d ANT =(b+t)sinα, b is the narrow side of the waveguide inner cavity, and t is the thickness of the partition plate; the wave front of the electric field emitted by the guidance radar reaching the antenna A and the antenna B is respectively and is the unit vector in the horizontal direction of the earth, and E0 is the field strength reaching the ammunition;

[0014] Therefore, the electric fields received by the antenna A and the antenna B are respectively:

[0015] E A =-E0sinα

[0016]

[0017] The amplitude expression of the sum channel signal and the difference channel signal is constructed by using the electric fields received by the antenna A and the antenna B, and the roll angle of the ammunition is calculated by substituting the actual received amplitude of the sum channel signal and the difference channel signal into the above formula.

[0018] Further, the material of the antenna cover 1 is fused quartz ceramic with a density of 1.95±0.1 g / cm3, which can withstand the high temperature and high pressure environment conditions generated in the instant of ammunition launching.

[0019] Further, the outer diameter D of the antenna cover 1 is 15 mm, the thickness L of the wave-transparent area is 10 mm, the diameter d of the assembly hole is 12 mm, and the depth L' of the assembly hole is 2 mm.

[0020] Further, the total length l of the waveguide opening antenna 2 is 51.48 mm, the diameter d1 of the first-stage cylinder is 12 mm, the diameter d2 of the second-stage cylinder is 14 mm, and the length l of the second-stage cylinder t is 22.48 mm.

[0021] Further, the length s of the rectangular blind groove of the second-stage cylinder is 16 mm, the width s is 3.5 mm, and the depth s is 2.55 mm. l w h Further, the length s of the rectangular blind groove of the second-stage cylinder is 16 mm, the width s is 3.5 mm, and the depth s is 2.55 mm.

[0022] Further, the stepped waveguide-coaxial conversion structure is selected in a three-stage stepped form.

[0023] The beneficial effects of the present application are as follows:

[0024] The waveguide opening antenna described in the present application is fastened in the informationized ammunition tail through screws, the radome can withstand the high-temperature and high-pressure environmental conditions generated in the instant of ammunition launching, in the rolling process of the ammunition, the Ka-band linearly polarized radio frequency signal is received by the waveguide opening antenna with equal amplitude and in-phase, and then the rolling angle of the ammunition is calculated after the received signal is processed by the receiving system and the decoding system. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structural composition diagram of the waveguide opening antenna described in the present application;

[0026] Figure 2 is a structural diagram of the radome in the antenna described in the present application;

[0027] Figure 3 is a structural diagram of the waveguide opening antenna in the antenna described in the present application;

[0028] Figure 4 is a schematic diagram of the application scenario of the antenna described in the present application;

[0029] Figure 5 is the sum and difference patterns of the antenna described in the present application. DETAILED DESCRIPTION

[0030] The present application will be further described below in combination with the drawings and examples.

[0031] The present embodiment provides a high-temperature and high-pressure resistant embedded waveguide opening antenna applied to rolling angle measurement, which is fixedly installed at the tail of informationized ammunition, and a structural diagram thereof is as shown in Figure 1 which comprises a radome 1, a waveguide opening antenna 2, a socket plate 3 and a radio frequency connector 4 connected in sequence.

[0032] A structural diagram of the radome 1 is as shown in Figure 2 ​​As shown, it is a cylinder, the bottom is provided with a circular blind slot as an assembly hole for bonding the radome 1 on the waveguide opening antenna 2; in this embodiment, the material of the radome 1 is fused quartz ceramic with a density of 1.95±0.1 g / cm3, which can withstand the high temperature and high pressure environment conditions generated in the instant of ammunition launching. The outer diameter D of the radome 1 is 15 mm, the thickness L of the wave-transparent area is 10 mm, the diameter d of the assembly hole is 12 mm, and the depth L' of the assembly hole is 2 mm.

[0033] The structural schematic diagram of the waveguide opening antenna 2 is as shown in Figure 3 It includes an outer shell and an inner cavity structure located inside the outer shell.

[0034] The outer shell is a two-stage cylinder connected in sequence, with a total length l of 51.48 mm, a diameter d1 of the first-stage cylinder of 12 mm, a diameter d2 of the second-stage cylinder of 14 mm, and a length l of the second-stage cylinder of 22.48 mm. The outer wall of the second-stage cylinder is provided with four rectangular blind slots for realizing the positioning between the waveguide opening antenna 2 and the informationized ammunition, with a length s of the rectangular blind slot of 16 mm, a width s of 3.5 mm, and a depth s of 2.55 mm; the bottom of the second-stage cylinder is provided with a plurality of screw hole positions distributed on a circle with a diameter of 11.5 mm. t l w h

[0035] The inner cavity structure includes two coaxial-waveguide antennas and a partition plate, and the two coaxial-waveguide antennas are separated by the partition plate; the two coaxial-waveguide antennas are the same in structure and each includes a waveguide and a stepped waveguide-coaxial conversion structure connected in sequence. The stepped waveguide-coaxial conversion structure is selected in a 3-stage stepped form; a blind hole is formed on the first-stage step.

[0036] In this embodiment, the wide side a of the waveguide inner cavity is 7.11 mm, the narrow side b is 3.56 mm, the thickness t of the partition plate is 0.65 mm, the step width w is 2 mm, the length l1 of the first-stage step is 0.74 mm, the height h1 is 2.39 mm, the length l2 of the second-stage step is 1.47 mm, the height h2 is 1.76 mm, the length l3 of the third-stage step is 2.74 mm, and the height h3 is 0.88 mm. The diameter dd of the blind hole of the first-stage step is 0.2 mm, the height hh is 1.78 mm, and the depth ll is 0.4 mm.

[0037] The socket board 3 is provided with openings at the screw hole positions of the bottom of the second-stage cylinder and the blind hole of the first-stage step, and the antenna is fastened in the informationized ammunition tail through the screw hole positions of the second-stage cylinder and the socket board 3; one end of the radio frequency connector 4 is inserted into the blind hole of the first-stage step through the opening of the socket board 3, and the other end is an SSMP-J interface.

[0038] ​​​​In the rolling process of the ammunition, the high-temperature and high-pressure embedded waveguide opening antenna applied to the rolling angle measurement receives Ka-band linearly polarized radio frequency signals.

[0039] Specifically, for the received Ka-band linearly polarized radio frequency signals, the equal-amplitude and in-phase signals pass through the waveguide opening antenna, and then pass through a receiving system and a decoding processing system, so that the rolling angle of the ammunition is calculated.

[0040] As shown in Figure 4 , the electromagnetic wave emitted by the guidance radar is horizontally polarized, the rolling angle of the ammunition is denoted as alpha, the included angle between the trajectory tangent and the pointing direction of the guidance radar is denoted as theta, and the phase difference of the wave front reaching the antennas A and B is where d ANT =(b+t)sin alpha, the wave front of the electric field emitted by the guidance radar reaching the antennas A and B is and is the unit vector in the horizontal direction of the earth, E0 is the field strength reaching the ammunition, the polarization directions of the antennas A and B are the same, and are respectively:

[0041]

[0042] Therefore, the electric fields received by the antennas A and B are respectively:

[0043]

[0044] The electric fields received by the antennas A and B in the rolling process of the ammunition are sinusoidal changes. The amplitude expressions of the sum channel signal and the difference channel signal are constructed by using the electric fields received by the antennas A and B.

[0045] As shown in Figure 5 , the waveguide opening antennas A and B can form a sum-difference pattern. The radio frequency signals received by the antennas in the rolling process of the ammunition are the projections of the radio frequency signals emitted by the guidance radar in the polarization directions of the antennas, the sum channel signal and the difference channel signal also present sinusoidal changes in the rolling process of the ammunition, and the rolling angle of the ammunition is calculated according to the amplitude values of the received sum channel signal and difference channel signal.

[0046] In the application, the waveguide opening antennas and the socket plate are embedded and fastened in the informationized ammunition tail through screws, the antenna cover can withstand the high-temperature and high-pressure environmental conditions generated in the instant of ammunition launching, in the rolling process of the ammunition, the Ka-band linearly polarized radio frequency signals are received, the equal-amplitude and in-phase signals pass through the waveguide opening antennas, and then pass through a receiving system and a decoding processing system, so that the rolling angle of the ammunition is calculated.

Claims

1. A high-temperature and high-pressure resistant embedded waveguide aperture antenna for roll angle measurement, characterized in that: It includes a device fixedly mounted on the tail of an information-based ammunition, and includes a radome (1), a waveguide opening antenna (2), a socket board (3) and a radio frequency connector (4) connected in sequence; The antenna cover (1) is cylindrical, and a circular blind groove is opened at the bottom as an assembly hole for bonding the antenna cover (1) to the waveguide opening antenna (2); The waveguide opening antenna (2) comprises a shell and an inner cavity structure located inside the shell; The outer shell is a two-stage cylinder connected in sequence; the cylinder adjacent to the antenna cover (1) is marked as the first-stage cylinder, the diameter of the first-stage cylinder is smaller than that of the second-stage cylinder, and the outer wall of the second-stage cylinder is provided with four rectangular blind grooves for achieving positioning between the waveguide opening antenna (2) and the informationized ammunition; the bottom of the second-stage cylinder is provided with a plurality of screw hole positions; The inner cavity structure includes two coaxial-waveguide antennas and a partition, and the two coaxial-waveguide antennas are separated by the partition; the two coaxial-waveguide antennas have the same structure, both including sequentially cascaded waveguides and a stepped waveguide-coaxial conversion structure, and a blind hole is opened on the first step of the stepped waveguide-coaxial conversion structure; The socket plate (3) is opened at the screw hole position at the bottom of the second-level cylinder and the blind hole of the first-level step, and the antenna is embedded and fastened to the tail of the informationized ammunition through the screw holes of the socket plate (3) and the second-level cylinder; one end of the radio frequency connector (4) is inserted into the blind hole of the first-level step through the opening of the socket plate (3), and the other end is an SSMP-J interface.

2. The high temperature and high pressure resistant embedded waveguide aperture antenna for roll angle measurement according to claim 1, characterized in that: The specific method of using the above-mentioned waveguide aperture antenna to realize the roll angle measurement of informationized ammunition is as follows: The electromagnetic wave emitted by the guidance radar is horizontally polarized, and the rolling angle of the ammunition is α The angle between the trajectory tangent and the guidance radar direction is θ The two coaxial waveguide antennas in the waveguide opening antenna (2) are marked as antenna A and antenna B respectively. The phase difference of the wavefronts reaching antenna A and antenna B is , where the intermediate variable , b is the narrow side of the waveguide cavity, t is the thickness of the partition; the wavefronts of the electric field emitted by the guidance radar reaching antenna A and antenna B are and , is the unit vector in the horizontal direction of the earth, To reach the ammunition field strength; Then the electric fields received by antenna A and antenna B are: The electric fields received by antenna A and antenna B are used to construct the amplitude expressions of the sum signal and the difference signal. The actual amplitudes of the sum signal and the difference signal are substituted into the electric field formula received by line A and antenna B to solve the roll angle of the ammunition.

3. The high temperature and high pressure resistant embedded waveguide aperture antenna for roll angle measurement according to claim 1, characterized in that: The material of the radome (1) has a density of 1.95±0.1g / cm 3 The fused quartz ceramic can withstand the high temperature and high pressure environmental conditions generated at the moment of ammunition firing.

4. The high temperature and high pressure resistant embedded waveguide aperture antenna for roll angle measurement according to claim 1, characterized in that: The outer diameter of the radome (1) D The thickness of the wave-transmitting area is 15mm L The diameter of the mounting hole is 10 mm d The depth of the mounting hole is 12mm L’ 2mm.

5. The high temperature and high pressure resistant embedded waveguide aperture antenna for roll angle measurement according to claim 1, characterized in that: Total length of the housing of the waveguide opening antenna (2) l The diameter of the first-stage cylinder is 51.48 mm. d 1 is 12mm, the diameter of the second-stage cylinder d 2 is 14mm, the length of the second-stage cylinder l t It is 22.48mm.

6. The high temperature and high pressure resistant embedded waveguide aperture antenna for roll angle measurement according to claim 1, characterized in that: Length of the rectangular blind groove of the second-stage cylinder s l 16mm, width s w 3.5mm, depth s h It is 2.55mm.

7. The high temperature and high pressure resistant embedded waveguide aperture antenna for roll angle measurement according to claim 1, characterized in that: The stepped waveguide-coaxial conversion structure adopts a three-step form.

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