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

Abstract

The invention discloses a high-temperature-resistant 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 board are embedded and fastened at the tail of informatization ammunition through screws, the antenna housing can bear high-temperature and high-pressure environment conditions generated at the moment of ammunition launching, and in the ammunition rolling process, Ka-band linear polarization radio-frequency signals are received and pass through the waveguide opening antenna in an equal-amplitude and same-phase mode, and the high-temperature and high-pressure environment conditions are achieved. And the ammunition roll angle is analyzed and calculated after passing through the receiving system and the decoding processing system.

Description

Technical Field

[0001] The present invention belongs to the technical field of microwave antennas, and in particular relates to a high temperature and high pressure resistant embedded waveguide opening antenna used for roll angle measurement. Background Art

[0002] Informationized ammunition is an ammunition that can complete corrected or guided trajectory control through information acquisition and transmission, and efficiently achieve hits, damage or information confrontation. After being launched, informationized ammunition usually rotates forward and flies forward. It receives correction instructions sent by the guidance radar, combines its own roll angle information to make trajectory corrections, and continuously controls the servo to fly toward the target. The key to flight control lies in real-time reception of guidance radar instructions and real-time measurement of the projectile's own roll angle. Roll angle measurement is the basis of informationized ammunition flight control, and the measurement accuracy will directly affect the strike accuracy of guided artillery shells.

[0003] The existing roll angle measurement relies on gyroscopes, GPS and geomagnetism. The gyroscope will produce large accumulated errors during the rolling process of the ammunition and cannot work independently for a long time. The GPS data rate is low, it is easily interfered or blocked, and the initialization time is long. The geomagnetism has a blind spot and is easily interfered. The existing roll angle measurement methods cannot solve the roll angle measurement problem of informationized ammunition. Summary of the invention

[0004] The object of the present invention is to overcome the defects of the prior art and provide a high temperature and high pressure resistant embedded waveguide opening antenna for roll angle measurement.

[0005] The technical problem proposed by the present invention is solved in this way:

[0006] A high temperature and high pressure resistant embedded waveguide opening antenna used for roll angle measurement, comprising a radome 1, a waveguide opening antenna 2, a socket board 3 and a radio frequency connector 4, which are fixedly installed at the tail of an informationized ammunition and are connected in sequence;

[0007] The radome 1 is cylindrical, and a circular blind groove is provided at the bottom as an assembly hole for bonding the radome 1 to the waveguide opening antenna 2;

[0008] The waveguide opening antenna 2 comprises a shell and an inner cavity structure located inside the shell;

[0009] 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 the second-stage cylinder, and the outer wall of the second-stage cylinder is provided with four rectangular blind grooves for positioning 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;

[0010] 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, and both include 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;

[0011] The socket board 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 board 3 and the second-level cylinder; one end of the RF connector 4 is inserted into the blind hole of the first-level step through the opening of the socket board 3, and the other end is a SSMP-J interface.

[0012] Furthermore, the specific method of using the above antenna to realize the roll angle measurement of informationized ammunition is as follows:

[0013] The electromagnetic waves emitted by the guidance radar are horizontally polarized. The rolling angle of the ammunition is α, and 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 wavefront phase difference reaching antenna A and antenna B is where d ANT =(b+t)sinα, 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 respectively and is the unit vector in the horizontal direction of the earth, and E0 is the field strength of the arriving ammunition;

[0014] Then the electric fields received by antenna A and antenna B are:

[0015] E A =-E0sinα

[0016]

[0017] The amplitude expressions of the sum signal and the difference signal are constructed using the electric fields received by antenna A and antenna B. The roll angle of the ammunition is solved by substituting the amplitudes of the sum signal and the difference signal actually received into the above formula.

[0018] Furthermore, 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 environmental conditions generated at the moment of ammunition firing.

[0019] Furthermore, the outer diameter D of the radome 1 is 15 mm, the thickness L of the wave-transmitting 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] Furthermore, the total length l of the shell 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 is t It is 22.48mm.

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

[0022] Furthermore, the stepped waveguide-coaxial conversion structure adopts a three-step form.

[0023] The beneficial effects of the present invention are:

[0024] The waveguide opening antenna and the socket plate of the present invention are embedded and fastened at the tail of the informationized ammunition by screws. The antenna cover can withstand the high temperature and high pressure environmental conditions generated at the moment of ammunition launching. During the rolling process of the ammunition, the received Ka-band linearly polarized radio frequency signal passes through the waveguide opening antenna with equal amplitude and phase, and then passes through the receiving system and the decoding processing system, so as to realize the analytical calculation of the rolling angle of the ammunition. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structural composition of the waveguide opening antenna of the present invention;

[0026] Figure 2 It is a schematic structural diagram of the antenna cover in the antenna of the present invention;

[0027] Figure 3 It is a schematic diagram of the structure of the waveguide opening antenna in the antenna of the present invention;

[0028] Figure 4 This is a schematic diagram of an application scenario of the antenna of the present invention;

[0029] Figure 5 It is the sum and difference radiation pattern of the antenna described in the present invention. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0031] This embodiment provides a high temperature and high pressure resistant embedded waveguide opening antenna for roll angle measurement, which is fixedly installed at the tail of informationized ammunition. Figure 1 As shown, it includes a radome 1, a waveguide opening antenna 2, a socket board 3 and a radio frequency connector 4 which are connected in sequence.

[0032] The schematic diagram of the structure of the antenna cover 1 is as follows Figure 2As shown, it is a cylinder with a circular blind groove at the bottom as an assembly hole for bonding the radome 1 to the waveguide opening antenna 2; in this embodiment, the radome 1 is made of fused quartz ceramic with a density of 1.95±0.1g / cm3, which can withstand the high temperature and high pressure environment conditions generated by the moment of ammunition firing. The outer diameter D of the radome 1 is 15mm, the thickness L of the wave-transmitting area is 10mm, the diameter d of the assembly hole is 12mm, and the depth L' of the assembly hole is 2mm.

[0033] The structural diagram of the waveguide opening antenna 2 is shown in FIG. Figure 3 As shown, it includes a shell and an inner cavity structure located inside the shell;

[0034] The 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 t The outer wall of the second-stage cylinder is provided with four rectangular blind grooves for positioning the waveguide opening antenna 2 and the informationized ammunition. The length of the rectangular blind grooves is s l 16mm, width s w 3.5mm, depth s h The bottom of the second-stage cylinder is provided with a plurality of screw holes distributed on a circle with a diameter of 11.5 mm.

[0035] 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, and both include sequentially cascaded waveguides and a stepped waveguide-coaxial conversion structure. The stepped waveguide-coaxial conversion structure adopts a three-step form; a blind hole is opened on the first step.

[0036] In this embodiment, the wide side a of the waveguide cavity is 7.11 mm, the narrow side b is 3.56 mm, the thickness t of the partition is 0.65 mm, the step width w is 2 mm, the length l1 of the first step is 0.74 mm, the height h1 is 2.39 mm, the length l2 of the second step is 1.47 mm, the height h2 is 1.76 mm, the length l3 of the third step is 2.74 mm, and the height h3 is 0.88 mm. The blind hole diameter dd of the first 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 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 board 3 and the second-level cylinder; one end of the RF connector 4 is inserted into the blind hole of the first-level step through the opening of the socket board 3, and the other end is a SSMP-J interface.

[0038] During the rolling process of the ammunition, the high temperature and high pressure resistant embedded waveguide opening antenna used for rolling angle measurement described in this embodiment receives the Ka-band linearly polarized radio frequency signal.

[0039] Specifically, the received Ka-band linearly polarized RF signal passes through the waveguide opening antenna with equal amplitude and phase, and then passes through the receiving system and decoding processing system to realize the analytical calculation of the ammunition roll angle.

[0040] like Figure 4 As shown, the electromagnetic wave emitted by the guidance radar is horizontally polarized. Let the rolling angle of the ammunition be α, and the angle between the trajectory tangent and the guidance radar pointing be θ. Then the phase difference of the wavefront reaching antenna A and antenna B is where d ANT =(b+t)sinα, the wavefronts of the electric field emitted by the guidance radar reaching antenna A and antenna B are respectively and is the unit vector in the horizontal direction of the earth, and E0 is the field strength reaching the ammunition. The polarization directions of antenna A and antenna B are the same, respectively:

[0041]

[0042] Then the electric fields received by antenna A and antenna B are:

[0043]

[0044] The electric field received by antenna A and antenna B during the rolling process of the ammunition is a sinusoidal change. The amplitude expressions of the sum path signal and the difference path signal are constructed using the electric field received by antenna A and antenna B.

[0045] like Figure 5 As shown, the waveguide opening antenna A and antenna B can form a sum and difference pattern. The RF signal received by the antenna during the rolling process of the ammunition is the projection of the RF signal transmitted by the guidance radar in the polarization direction of the antenna. The sum path signal and the difference path signal also show sinusoidal changes during the rolling process of the ammunition. The amplitude of the received sum path signal and the difference path signal are substituted into the above formula to solve the rolling angle of the ammunition.

[0046] In the present invention, the waveguide opening antenna and the socket plate are embedded and fastened at the tail of the informationized ammunition by screws, and the antenna cover can withstand the high temperature and high pressure environmental conditions generated at the moment of ammunition launching. During the rolling process of the ammunition, the received Ka-band linearly polarized radio frequency signal passes through the waveguide opening antenna with equal amplitude and phase, and then passes through the receiving system and the decoding processing system, so as to realize the analytical calculation of the rolling angle of the ammunition.

Claims

1. A high temperature and high pressure resistant embedded waveguide aperture antenna for roll angle measurement, characterized in that: It comprises a device fixedly installed at the tail of an information-based ammunition, and comprises a radome (1), a waveguide opening antenna (2), a socket board (3) and a radio frequency connector (4) which are connected in sequence; The radome (1) is cylindrical, and has a circular blind groove at the bottom as an assembly hole for bonding the radome (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 a 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 realizing the 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, and both include 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 antenna to realize the roll angle measurement of informationized ammunition is as follows: The electromagnetic waves emitted by the guidance radar are horizontally polarized. The rolling angle of the ammunition is α, and 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 wavefront phase difference reaching antenna A and antenna B is where d ANT =(b+t)sinα, 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 respectively and is the unit vector in the horizontal direction of the earth, and E0 is the field strength of the arriving ammunition; Then the electric fields received by antenna A and antenna B are: E A =-E0sinα The amplitude expressions of the sum signal and the difference signal are constructed using the electric fields received by antenna A and antenna B. The roll angle of the ammunition is solved by substituting the amplitudes of the sum signal and the difference signal actually received into the above formula.

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) is fused quartz ceramic with a density of 1.95±0.1 g / cm3, and 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 D of the antenna cover (1) is 15 mm, the thickness L of the wave-transmitting 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.

5. The high temperature and high pressure resistant embedded waveguide aperture antenna for roll angle measurement according to claim 1, characterized in that: The total length l of the shell 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 is 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: The length of the rectangular blind groove of the second-stage cylinder is 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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