JPS61100677A - Radar equipment - Google Patents

Abstract

PURPOSE:To enhance the directionality of beam to an object in a predetermined direction, by freely moving element antennae radially attached to the outer surface of a circular antenna by a drive apparatus. CONSTITUTION:A judge circuit judges the direction to which an object is concentrated and the judge signal thereof is sent to an element antenna control circuit 15 which, in turn, performs control in order to direct an element antenna 1 to a direction, which maximizes the element emitting pattern of each element antenna 1, with respect to the object in a predetermined direction and the element antenna 1i s driven to the predetermined direction by an element antenna driving apparatus 16. Therefore, the element antenna 1 is directed to the direction, to which the object is concentrated, by the judge signal of the judge circuit and, therefore, the directionality of beam to the object in the predetermined direction is enhanced.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to, for example, a radar device for detecting, receiving, and tracking a target, and particularly relates to improving the beam directivity of a radar antenna. .

[Conventional technology]

Figure 3 is a block diagram showing a conventional circular array antenna as shown in, for example, the Antenna Engineering Handbook (published by the Institute of Electronics and Communication Engineers, Ohmsha, 1955). In Figure 1, (1) is an element antenna, (2) (3) is the semicircular outer surface of the antenna; (4) is the phase shifter that is connected to each element antenna and applies a predetermined amount of phase shift to the transmitted and received signals; 5) is a power divider that distributes power to each phase shifter; t(6) is a transmission/reception switch;
(7) is a receiver, and the signal caught by the receiver (7) passes through the signal processing circuit (8), and (9) a display consisting of a CRT screen or printer, and generates a transmission signal. It is a transmitter.

Furthermore, the transmitter α1. Phase shifter (4), transmission/reception switch (
6) The 1 indicator (9) is controlled (by the 1υ control circuit).

A conventional radar device is constructed as described above, and when a radar beam is directed in a certain direction from a circular array antenna of a side light fan.

The directivity angle of the beam is calculated by the control circuit I, and as a result, the signal is transmitted to the transmitter a1, which sends a signal for transmission to the power divider (5), each phase shifter (4), and the element antenna. (1)
It controls the phase of the radio waves radiated from the element antennas (11), and further combines the radio waves from each element antenna (11) in the air to direct the antenna's radiation beam in the direction of the target.

[Problem 9 to be solved by the invention Since the element antennas (1) are radially fixed to the circular antenna outer surface (3), one normal element antenna (11
The direction in which the radiation intensity of the element radiation pattern is maximum also spreads radially. Therefore, the radiation level toward the target of the element antenna (1) facing in a direction other than the direction of one target becomes small. Therefore, there is a problem in that the beam directivity seen from one direction is inferior to that of a planar array antenna.

This invention was made to solve this problem, and provides a radar device in which the beam directivity of one circular array antenna when viewed from one direction is on the same level as the beam directivity of a planar array antenna. aim to obtain
[Means for solving the problem] The radar device according to the present invention has an element antenna (
(1) for mechanically operating the element antenna (1), and an element antenna control record aS for controlling the drive of the element antenna (1), and if there are multiple targets, the threat level for the target is This is equipped with a determination circuit υ that determines the direction with the largest value and outputs the signal to the element antenna control circuit (a).

[Effect]

In this invention, the element antenna (1) radially attached to the circular antenna outer surface (3) can be moved freely due to the introduction of the element antenna drive device fαe, so that it can be moved in the direction where the target objects are concentrated. Each element antenna (1) in the direction that maximizes the antenna pattern of each element.
can be directed. Therefore, the multi-element antenna (1) is directed in the direction where the target objects are concentrated according to the determination signal of the 0 determination circuit 0, so that the directivity of the beam toward the target object in a predetermined direction is improved.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of the present invention (
ll to υ are exactly the same as the above-mentioned conventional device. a
a is the element antenna (1) connected to the antenna outer surface (3).
) is a rotation axis for freely rotating the object, a3 is a determination circuit that determines the direction in which the target object is concentrated, α5 is a determination circuit α
Element antenna (1
) is an element antenna control circuit that controls the direction of the element antenna (1) to maximize the element radiation pattern, αQ is based on the element antenna control circuit α signal transmitted from the coaxial cable (2). This is an element antenna driving device that drives an element antenna in a predetermined direction.

Note that I is shown in FIG. 2, and includes the phase shifter (4), the element antenna control circuit α1, and the element antenna drive device αe?
! -Each element antenna (1
) and mm.

In the radar device configured as described above, the 1 determination circuit αj determines the direction in which the targets are concentrated, and sends the determination signal to the element antenna control circuit α9 to determine the element radiation pattern of each element antenna (1). In order to direct the element antenna (1) toward a target in a predetermined direction in the direction in which the maximum drive.

〔Effect of the invention〕

This invention has been explained above) The element antenna +11 includes a driving device and a control circuit for controlling it.

Furthermore, with the simple structure of attaching a judgment circuit (to), a nine-circular array antenna can be used to move down to the left and right from the element antenna (1) that is closest to the element antenna (!) for a certain target. In addition to improving the problem that the radiation level of the element antenna (1) deteriorates as the radiation level decreases, by making the element antenna (1) a drive type and adding a judgment circuit, the element antenna Since the radiated power (radio waves) for the target object increases, the detection distance of the target object is extended and the detection ability is improved, and the tracking error is reduced, so the tracking accuracy is improved.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention. Figure 2
This figure is a block diagram showing the internal configuration of the module in FIG. 1, and FIG. 3 is a block diagram of a radar device showing a conventional circular array antenna. In the figure, (1) is the element antenna, (2) is the coaxial cable, (3) is the outer surface of the antenna, and ! 41Fi, phase shifter, (5) is power divider, (6) is transmitter/receiver switch, (7) is receiver, (8) is signal processing circuit, (9) is display, (I
I is the transmitter, the control circuit is the control circuit, α is the rotation axis, α1 is the judgment circuit, aJ is the module, ←9 is the element antenna control circuit, aS is the element antenna drive device, α is the transmission signal input terminal, all is a judgment signal input terminal. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] A plurality of element antennas that radiate radio waves are arranged in a circular or hemispherical shape, and behind each element antenna there is a coaxial cable for transmission, a phase shifter for changing the phase of the radiated radio waves, and a A power divider that distributes power to the element antennas, a transmitter that generates pulsed transmission radio waves, a receiver that amplifies and detects the reception signals received by each of the element antennas, and a transmission signal that is output from the transmitter. a transmission/reception switch that guides the received signal to the power divider and the received signal to the receiver, a signal processing circuit that determines whether the detected output of the receiver is a signal or not, and a display that displays the output of the signal processing circuit. and a control circuit that controls the transmitter, phase shifter, transmission/reception switch, and display,
A determination circuit that determines the direction in which the target is concentrated based on the output of the signal processing circuit and the status signal of the control circuit, and the above-mentioned element antenna in the direction in which the target is concentrated according to the command signal from this determination circuit. An element antenna drive device for directing the antenna and a control circuit for controlling the power supplied to each element antenna are added, and these phase shifters, the element antenna drive device, and the element antenna control circuit are configured as one module. A radar device characterized by: