JPH0552919A - Monopulse antenna for guided missile - Google Patents

Abstract

PURPOSE:To obtain a monopulse antenna for guided missiles which can arrange a missile guiding means without trouble and can obtain information regarding the polarization of radio waves. CONSTITUTION:This monopulse antenna is provided with four antenna elements 7 each of which is constituted of rod-like elements which are arranged in parallel on a conductor plate and provided with nonreflective terminating ends on one ends and feeding points on the other ends, and then, moderately bent together with the conductor plate so as to adjust their beam characteristics. The four elements 7 are arranged on the outer peripheral surface of the head section of a guided missile 12 at 90 deg. intervals in the circumferential direction, with the direction of the elements 7 being made coincident with the axial direction of the missile 12 so that the beam direction can be made coincident with the advancing direction of the missile 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wideband monopulse antenna used for guiding an induction vehicle.

[0002]

2. Description of the Related Art Conventionally, a conical or spiral antenna has been used as a wideband monopulse antenna used to guide an induction vehicle.

[0003]

In the conventional guidance of the guided vehicle using such an antenna, it is necessary to dispose the antenna in front of the head of the guided vehicle, and mounting and mounting to provide other guiding means. It was a big obstacle in placement.
Further, there is a problem that information on the polarization of the received radio wave cannot be obtained by the conventional method. An object of the present invention is to provide a monopulse antenna that can eliminate the obstacle of the arrangement of the guiding means with respect to the guided flying object and can obtain the information regarding the polarization of the radio wave.

[0004]

In the monopulse antenna of the present invention, a rod-shaped element is arranged in parallel with a conductor plate,
This element has an antenna element in which a reflection-free termination is arranged at one end and a feeding point is arranged at the other end, and a rod-shaped element is gently bent together with a conductor plate to adjust the beam characteristics. Four antenna elements are guided. It is configured so that the machine axis direction and the element direction coincide with each other on the outer circumference of the head of the projectile, and they are arranged at intervals of 90 ° in the circumferential direction so that the beam direction coincides with the traveling direction of the guided projectile. .. Further, the four antenna elements arranged on the circumference are configured to be integrally rotated in the circumferential direction without changing the element direction.

[0005]

According to the present invention, by arranging the antenna element on the outer periphery of the guided vehicle, the front surface of the guided vehicle can be effectively used. Further, information on the polarization can be obtained by taking the sum and difference of the outputs of the four antenna elements arranged at 90 ° intervals.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing the overall configuration of an embodiment of the present invention, in which four antenna elements 7, the details of which will be described later, are mounted at 90 ° intervals in the circumferential direction of a cylindrical holding plate 19. A ring gear 11 is integrally provided on the cylindrical holding plate 19, and a rotational force is transmitted by a pinion 10 rotated by an electric motor 8 to rotate around a machine axis of the guided projectile 12. The rotation angle of the electric motor 8 is the angle measuring device 9
The angle signal is obtained. The output signals of the four antenna elements 7 are input to the signal processing unit 18 via the cable 17.
Further, there is nothing in the space inside and the front surface of the cylindrical holding plate 19, and it can be used for providing other guiding means.

As shown in the sectional structure of FIG. 2, the antenna element 7 has a rod-shaped element 1 arranged on a conductive plate 2, a power feeding connector 4 at one end and a non-reflective terminal 3 at the other end. It constitutes a traveling waveform antenna. The rod-shaped element 1 is held by a dielectric 5, is gently bent together with the conductive plate 2 to adjust the beam characteristics, and is protected by the radome 6. The beam direction of the antenna element 7 is aligned with the traveling direction of the guided flying body 12.

Next, a functional block configuration is shown in FIG. Although the antenna element 7 itself is a linearly polarized antenna,
Since the directions of the one antenna element 7 are displaced by 90 °, the addition and subtraction of these outputs is performed by the adder / subtractors 13 and 14 by a hybrid circuit or the like, and four kinds of Δ signals (ΔEL _V , ΔAZ _V , ΔEL _H , ΔAZ _H ) and 2
It is possible to obtain seed Σ signals (Σ _H , Σ _V ). Among them, Σ _H and Σ _V are Σ signals corresponding to orthogonal polarizations, but the average value of the products of the signals of Σ _H and Σ _V is zero so that the anti-phase or in-phase component of them is zero. If the electric motor 8 is driven by the signal S amplified by the amplifier 15 and the antenna is turned, the level difference and phase difference of Σ _H and Σ _V and the output φ of the angle measuring device 9 cause Information on types and directions can be obtained.

On the other hand, by rotating the four antenna elements by the antenna turning control, the four Δ signals (ΔEL _V , ΔAZ _V , ΔEL _H , ΔAZ _H ) are respectively Δ signals in the orthogonal directions with respect to the two orthogonal polarized waves. By converting this signal into the coordinate system of the guided projectile by the coordinate converter 16 using the output φ of the angle measuring device 9, Δ for the polarization orthogonal to the pitch axis and the yaw axis direction is obtained.
It becomes possible to obtain the signals (ΔP _V , ΔP _H and ΔY _V , ΔY _H ).

[0010]

As described above, according to the present invention, since the antenna element configured as a traveling wave antenna is arranged on the circumference of the guided vehicle, other elements are provided in the space inside and on the front surface of the guided vehicle. A device for providing the guiding means can be arranged. Further, by disposing the four antenna elements at 90 ° intervals, the sum and difference of the output signals from each element can be obtained, and the information on the polarization direction can be obtained based on these values. In particular, by allowing the four antenna elements to rotate in the circumferential direction, the arrangement of the antenna elements can be adjusted to the optimum positional relationship for obtaining the target signal in the polarization direction, and the turning angle of this antenna can be measured. By doing so, it is possible to obtain the information, and it is possible to obtain the information about the polarization in addition to the Δ signal and the Σ signal of the conventional monopulse antenna.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an overall configuration of an embodiment of a monopulse receiving antenna of the present invention.

2 is a cross-sectional view of the antenna element of FIG.

3 is a block diagram showing the circuit configuration of FIG. 1. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rod-shaped element 2 Conductive plate 3 Non-reflective terminal 4 Plug for feeding 7 Antenna element 8 Electric motor 9 Angle measuring device 12 Guided flying vehicle 13,14 Adder / subtractor 16 Coordinate converter 18 Signal processing part 19 Cylindrical holding plate

Claims (2)

[Claims] 1. A rod-shaped element is arranged in parallel with a conductor plate, a non-reflection end is arranged at one end of the element, and a feeding point is arranged at the other end, and the rod-shaped element is gently bent together with the conductor plate. It has an antenna element with adjusted beam characteristics, and four antenna elements are arranged on the outer circumference of the head of the guided vehicle with the direction of the axis and the direction of the element aligned, and at intervals of 90 ° in the circumferential direction. A monopulse antenna for a guided vehicle characterized by matching the beam direction with the traveling direction of the guided vehicle. 2. The monopulse antenna for an induction vehicle according to claim 1, wherein the four antenna elements arranged on the circumference are integrally rotated in the circumferential direction without changing the element directions.