JPS5820005A - antenna device - Google Patents

Abstract

PURPOSE:To eliminate the effect of an undesired wave in a short time, by composing a zero point having the directivity in the arriving direction of a desired wave and then compounding a zero point of a radiation pattern to the angle in the arriving direction of the undesired wave detected by scanning a main beam. CONSTITUTION:The interference of an undesired wave is first detected by a detecting circuit 8 in case when the arriving direction is known for a desired wave. If the interference is detected, a judging circuit 9 applies a judging signal to an angle indicating circuit 10 to detect the arriving direction of the undesired wave. The circuit 1 indicates the arriving direction thetaS of the desired wave and an optional angle thetaN1 other than thetaS to the next arithmetic circuit 12. The circuit 12 forms a zero point in the direction thetaS based on the above-mentioned judging signal and an angle indication and then calculates an oscillating distribution to form a main beam to the angle thetaN1. The circuit 10 replaces successively the angle thetaN1 and detects the angle thetaN1 in the arriving direction of the undesired wave where the electric power received at a signal receiver 7 is minimum. For a radiation pattern obtained under such conditions, the main beam is turned toward the desired wave and zero point is composed in the arriving direction of the undesired wave. As a result, the effect of the undesired wave can be eliminated.

Description

[Detailed description of the invention] This is an antenna device that is influenced by military police radio waves such as communications, broadcasting, and radar. Amebutibu array antenna that automatically removes 9 individual element antennas 0 excitation vibration @, 111
1 phase was adjusted to optimize the signal-to-noise ratio from the phase of gI1 component and noise component) 1k, and the zero point of the directionality of the electric field was synthesized in the direction of arrival of the unwanted wave. In this method, the larger the number of element antennas, the longer it takes to converge to provide optimal excitation and distribution, and the more complex a single circuit configuration becomes, making it difficult to realize in terms of real-time processing and reliability.

In order to eliminate these drawbacks, this invention first synthesizes the directional zero point in that direction under the condition that the direction of arrival of the desired wave is known, and then scans with the main beam to find the direction of arrival of the unwanted wave. It is characterized by detecting the angle and compositing the zero point of the radiation pattern at that angle.The purpose is to remove unnecessary waves in a short time and with a simple configuration. The drawings will be explained in detail below.

FIG. 1 shows the operating procedure of this invention.
) is a diagram showing the radiation pattern before knowing the direction of arrival of the unwanted waves, and the side rope receives the 1PflN coming from the angle θ1. The first factor (1) 1 is a radiation pattern in which a directional null point is synthesized in the direction of arrival of the desired wave 08 in order to detect the direction of arrival of unnecessary waves, and only unnecessary waves are received. be. Keep the zero point of the directivity in the direction of arrival of the desired wave, scan the main beam, and detect the direction of arrival θ1 of the cine wave using a procedure of 0 or more, where both directions where the received power is maximum are the direction of arrival of the unwanted wave. If so, Mori, Figure 1 (0
), the excitation amplitude and excitation phase are adjusted to obtain a radiation pattern having a zero point at an angle of 01 K and a main beam in the direction of arrival of the desired wave ls lIc.

Next, Figure 2 shows how to obtain the excitation distribution to obtain a radiation pattern with the main beam and zero points at the desired angles as shown in Figures 1(b) and (G)K. (a
) is a pattern with the main beam at angle θ2, and angle e
It is assumed that sK zero points are synthesized. SL2 diagram (1)) is a radiation pattern with a main beam at an angle oIsk, and this reception level a1 is taken to be equal to the side rope level a1 at the peak angle θsK in Figure 2. By superimposing the radiation pattern in the opposite phase to the radiation pattern in FIG. 2 (1), a radiation pattern having a main level at an angle 02 and a zero point at an angle aS is obtained as shown in FIG. 2 ((1)K).

FIG. 3 shows an embodiment of the present invention (11 is an array antenna configured by arranging a plurality of element antennas (21), (3) is a plurality of amplitude variable devices (4) and a phase shifter ( 5)
An excitation distribution adjuster consisting of (6) is a sum circuit, (7
; is a receiver, (8) is an un*m detection circuit, (9I should detect the direction of arrival of unnecessary waves (unnecessary wave arrival direction detection mode), but should a zero point be synthesized in the direction of arrival of unnecessary waves? The axis is an angle indicating circuit that indicates the direction angle to direct the main beam and the direction angle to synthesize the zero point.
Wave detection port @ (81, judgment circuit (91, angle indication circuit 0.) constitutes the unnecessary wave detection device all. (to) is the excitation distribution calculation circuit, 0 is the control circuit, and a. is the drive circuit. .

The operating procedure under the condition that the direction of arrival of the desired wave is known is as follows: First, the detection t13 circuit (81) detects whether unnecessary waves are interfering, and if there is interference, k is a 1 judgment circuit (9). gives a judgment signal for detecting the direction of arrival of unwanted waves to the angle indication circuit (log). The angle indication circuit aO instructs the next excitation distribution calculation circuit uK to set an arbitrary angle θN other than the desired wave arrival direction θB and θ8. Calculation The circuit υ calculates an excitation distribution for forming a zero point in the direction of arrival of the desired wave 08 and a main beam at the angle θN based on the judgment signal and angle instruction. 3 controls the drive circuit I.

The necessary distribution is given to the finger width variable device (41) and the phase shifter (51). In this state, the angle indicating circuit (1G) successively updates the above angle ay1, and selects the angle at which the received power at the receiver (71) is the minimum. θold is detected. This angle is the arrival direction of the unnecessary wave. If the arrival direction θN of the unnecessary wave is detected, the 1 judgment circuit (9) directs the main beam in the arrival direction of the desired wave, and detects the arrival direction of the unnecessary wave. Based on the above judgment signal, the zero-order angle instruction circuit Ws controller, which gives a judgment signal to direct the zero point in the direction, synthesizes the desired wave arrival, next direction 00 and zero point as the angle at which the main beam should be synthesized. The arrival of the unnecessary wave and the direction θN are instructed to the next circuit.Based on this instruction and the above judgment signal, the excitation distribution calculation section calculates the required excitation distribution.From this calculation result, the control circuit (to) The drive circuit aa is controlled to give the necessary excitation distribution to the amplitude variable device (41° phase shifter 15).The radiation pattern of the antenna in this state is that the main beam is directed in the direction of the desired wave, and the unwanted wave is Since the zero point is synthesized in the direction of arrival, the detection circuit (8) does not detect any unnecessary waves and obtains a signal from which the influence of unnecessary waves has been removed.The direction of arrival of unnecessary waves is no longer ON.

When unnecessary wave interference is detected, the mode is immediately switched to unnecessary wave arrival direction detection mode, and the above operation is repeated to eliminate the influence of unnecessary waves.

As described above, according to the present invention, the influence of unnecessary waves can be eliminated by a simple structure mainly consisting of main beam operation and switching.

Note that when detecting the direction of arrival of interference waves, a method is also used in which when the scanning beam faces the direction of arrival of unnecessary waves, the main beam is switched to a monopulse beam to accurately detect the direction of arrival of unnecessary waves.

The embodiment is as shown in Fig. 4, in which two array antennas are used.
Divide and create each sum circuit (6a).

(6b), and (4a) by the hybrid circuit system.
.

It is divided into a signal of the sum of (6b) and a signal of the difference of (4a)I(6b), and a monopulse beam is formed by this difference signal, and the direction of arrival is detected with high accuracy.

Although the above description has been made regarding the case where the element antennas are linearly arranged, the present invention is not limited to this, but includes a planar arrangement, 9 a circular arrangement, and 0 a cylindrical arrangement.

This can be carried out in the same way for all arrays, such as a spherical array, one conical array, etc., and similar effects can be obtained.

[Brief explanation of the drawing]

FIG. 1 (IL) (11) (0) is a diagram showing the operating procedure of the present invention. Fig. 2(a)(t))(0) is a diagram showing the procedure for forming the desired angle [K zero point, Fig. 3 is a basic configuration diagram of an embodiment of the present invention, and Fig. 94 is a diagram showing the procedure for forming the desired angle [K zero point]. In the configuration diagram below,
(11 is an array antenna, 1 is an element antenna, (3)
is an excitation distribution adjuster, (4) is an amplitude variable device, (5) is a phase shifter, (6I is a sum circuit, ff+ is a receiver, (8) is a detection circuit, (91 is a judgment circuit, and is an angle indicator. Circuit. Wholesale is not included! Wave arrival direction detection device, a is a calculation circuit. fi9 is a control circuit, Q) is a drive circuit, a!1 is a difference circuit,
(6ai (6b) is a sum circuit, and a5+ is a hybrid circuit. In the figures, the same or equivalent parts are indicated by the same symbols. Agent Shin Kuzuno - Figure 2 (a) 211th> Sir U3 Figure 3 Figure 4

Claims (1)

[Scope of claims] and a circuit that calculates a phase distribution for forming a zero point of a radiation pattern in the unnecessary direction of arrival using the detection result by the above-mentioned non-em arrival direction detection device and the radiation characteristics of the element antenna stored in advance. In the antenna device 1, the non-I! wave arrival direction detection device forms a zero point of a radiation pattern in the direction of arrival of the desired wave, forms a main beam of the radiation pattern in other directions, and detects that the main beam is A device is used to send a signal to the control circuit to continuously change the phase of the element antenna so as to spatially scan it, and to determine the direction of arrival of unwanted waves from the direction of the main beam where the reception level is maximum. An antenna device characterized by: - It has a pulse signal #& field function as an unnecessary wave arrival direction detection device, and when the main beam faces the unwanted wave arrival direction, the main beam is switched to the above-mentioned main beam V% no pulse beam, and the unnecessary wave is detected. An antenna device according to the patent claim WJ all II, which is characterized by a human having an unnecessary wave arrival direction detecting device that accurately detects the arrival direction. Claim 11M11111111[
ff1ll107y? device.