JPS6071973A - Phased array radar equipment - Google Patents

Abstract

PURPOSE:To continue searching and tracking a target even if a device is interfered with wide-band radio waves, by making it possible to transmit and receive microwaves of two kinds of frequency band simultaneously in the same direction. CONSTITUTION:Microwave signals corresponding to two kinds of frequency band A and B are synthesized in the first and the second mixing amplifiers 5a and 5b on the basis of signals from a reference signal generator 6 and the first and the second local oscillators 7a and 7b and are supplied to transmitting/receiving modules 2a and 2b corresponding to individual frequency bands through the first and the second transmission/reception switches 4a and 4b and the first and the second distributors/synthesizers 3a and 3b and are radiated simultaneously to the space from element antenna groups 1a and 1b. Reflected signals are received simultaneously by the first and the second element antenna groups 1a and 1b and pass the first and the second IF amplifiers 10a and 10b and are subjected to phase detection on a basis of an intermediate frequency reference signal 15 and are processed and synthesized by a signal processor 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a phased array radar device that electronically scans a beam by transmitting and receiving power from a large number of element antennas and controlling each phase of the power.

[Prior art]

FIG. 1 shows a block diagram of a conventional phased array radar device.

In the figure, (11 is an element antenna, (2) is a transmitting/receiving module, (31 is a combining distributor, (41 is a transmitting/receiving switch, (5)
) is a mixing amplifier, (6) is a reference signal generator, and (7) is a local oscillator.

(81 is the transmission pulse width, timing control section, (9) is the mixer, aα is the amplifier, (11) is the phase detector, a
z is a signal (2) processor, (131 is a display, a41 is a local oscillator output microwave signal, and ++!3 is an intermediate frequency reference signal.

Next, the operation will be explained.

First, during transmission, the microwave signal (I4 (frequency 9fL) output from the local oscillator (7) and the intermediate frequency reference signal QS (frequency tf
shall be. ) are mixed and amplified by a mixing amplifier (5) and pulse-modulated by the transmission pulse width and a signal from the timing control section (8) to become a pulsed transmission wave having a carrier frequency fJ and -1-fl. This transmitted wave is supplied to each transmitter/receiver module (2) via a transmitter/receiver switcher (4) and a distributor/combiner (3), and within each transmitter/receiver module (2) there is a phase change for beam steering. The power is amplified and radiated into space from each element antenna (1).

On the other hand, reflected waves from targets etc. are similarly reflected from each element antenna (11
The signal is received by the transmitter/receiver module (2) and amplified to the required level by a low noise amplifier. The outputs of these modules (2) are combined at a distribution combiner (31) and guided to a mixer (9) via a transmitter/receiver switcher (4), where they are mixed with the local oscillator output to generate an intermediate frequency ( IF) (3) This IF multiplied signal is amplified by IF amplifier Q (amplified by phase detector 01) and converted into intermediate frequency reference signal a.
The signal is phase-detected using the syr' reference and becomes a video signal, which undergoes target detection, tracking processing, etc. in the signal processor O2, and is displayed on the display a.

The conventional device is configured as described above, and the transmitted waves are S,
A single frequency pantone such as O,

For this reason, it has the disadvantage that radar cannot be used if it receives broadband radio wave interference that covers the entire frequency range used, but it is also disadvantageous against target loss (fading) due to multipath phenomena on the surface of the base or sea surface. Met.

[Summary of the invention]

This invention was made with the aim of improving this drawback.It uses a phased array antenna to transmit and receive two frequency bands at the same time, and processes and combines the received signals to generate radio waves (4). The present invention provides a phased array radar device that does not reduce its target detection ability even against interference, multipath phenomena on the ground surface, the sea surface, and the like.

[Embodiments of the invention]

FIG. 2 is a block diagram showing an embodiment of the invention.

In the figure, rla) and (1b) are the first. The second element antenna group (2a), (2b) is the first transmitting/receiving module group A, the second transmitting/receiving module group B, (3a), (3
b) is the whistle 1. Second distributing combiner, (4a), (4b)
is the first. The second transmission/reception switch, (5a) and (50) are the first
．． The second mixing amplifier (6) is the reference signal generator (7a
), (7b) are the first local oscillator A, the second local oscillator B, (9a), (91)) are the first mixer A, the second mixer B, (10a), (10b) are the 1. 2nd 'I'
P' amplifier, (11a), (111)) are the 1st and 2nd phase detectors, (12Fi signal processor, aj is the indicator, and the subscripts A and B of the name of each block are the frequency band A, respectively. and frequency band B (e.g. C band and
This indicates that it is a function (5) that has performance specifications corresponding to

In this example, the first element antenna (1a) group corresponding to frequency bands A and B, the first transmitting/receiving module (2
a) group, the second element antenna (1b), and the second transmitting/receiving module (2b) group are respectively 5 as shown in Fig. 3 (al).
．． Element antenna thinning (thinn) on the same antenna surface
ing) technology, or by mixing the
), all K frequency band groups of fidgets are arranged adjacent to each other. In FIG. 3, (IG is the antenna surface, (171 is the first element antenna (1a) group).

aS is the element antenna (1b) group, u9 is the (1a) group and (
1b) An example of a mixture of groups is shown as fidgeting.

In the radar apparatus configured as described above, the first ．． Second
Two types of frequency bands A and B are supported by the mixing amplifiers (5h) and (5b).

The microwave signals are combined into a first . 2nd transmission/reception switch (4h), (4b), 1st. Second distribution combiner (3
a), (3b) The signals are supplied to the transmitter/receiver module that corresponds to each frequency band (rN) via V, and are simultaneously radiated into space from a group of element antennas.

Similarly, the reflected signal is the first one. Second element antenna group (1a
), (1b) respectively. The second transmitting/receiving module (2a), (2b), the first. The second distributing combiner (3a), (3b), the first. A second transmission/reception switch (4a).

(4b), 1st. Second mixer (9a), (91))
, 1st. Second engineered F amplifier (ioa), (iob)
1st via v. Second phase detector (11a), (1
1b), the intermediate frequency reference signal t+5yr- is phase detected as a reference, and then processed and synthesized in the signal processor 02.

〔Effect of the invention〕

As described above, the radar device according to the present invention can transmit and receive microwaves of two different frequency bands in the same direction at the same time, and therefore has the following effects.

(1) Even if wideband radio interference is received, the interference rarely affects two frequency bands at the same time, so the reception system for the band where the interference was detected is automatically blanked and the reception system for the other band is switched on. Target detection and tracking can be continued by using signal (7) only.

(2) Fading caused by multipath phenomena on the ground or sea surface can also be minimized by combining the received signals using two frequency bands.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a conventional phased array radar device, FIG. 2 is a block diagram of a radar device showing an embodiment of the present invention, and FIG. 3 is a block diagram of an element antenna on a phased array antenna according to the present invention. The sequence is shown in Figure 3.
FIG. 3(a) shows an example in which element antennas for two types of frequency bands are mixed in one place. FIG. 3(b) shows an example in which elements for each frequency band are arranged adjacent to each other. In the figure, (1a) and (1b) are the first. The second element antenna (2a), (21)) is the first element antenna. The second transmitter/receiver module (5a), (3b) is connected to the first transmitter/receiver module (5a), (3b). A second distributing combiner. (4a) and (4b) are the first. Second transmitter/receiver switch, (5
a), (5b) are the first. The second mixing amplifier (6) is a reference signal generator. (8) (7a) and (7b) are the first. second local oscillator, (8
) is the transmission pulse width, timing control section, (9a), (
9b) is the first degree second mixer, (10a), (10b
) is the first. Second engineering F amplifier, (11a), (11b)
is the first. The second phase detector az is a signal processor, 031 is a display, (141 is a local oscillator output microwave signal,
09 is an intermediate frequency reference signal. In the drawings, the same or corresponding parts are designated by the same reference numerals. Agent Masuo Oiwa (9)

Claims (1)

[Claims] First and second element antenna groups that operate in different first and second frequency bands, and first and second transmitting/receiving module groups provided corresponding to the element antenna groups. an antenna arranged on the same plane, and the first and second antennas arranged on the same plane.
a local oscillator, and a generator for generating an intermediate frequency reference signal;
a first mixer inputting the output of the first local oscillator and an intermediate frequency reference signal and outputting a microwave signal corresponding to the first frequency band; a second mixer which inputs the frequency reference signal and outputs a microwave signal corresponding to the second frequency band; A first transmitter/receiver module that distributes power to a second transmitter/receiver module and also combines received power from the first and second transmitter/receiver modules.
Microwave signals of different frequency bands from the first and second antenna groups are transmitted simultaneously and in the same direction, and then reflected from the target and reflected from the first antenna group. and means for detecting, processing and combining received signals received by the second element antenna group for each frequency band.