JPS62153785A - Hybrid radar for ship - Google Patents

Abstract

PURPOSE:To enhance tracking capacity and to eliminate effect due to sea clutter, by dividing a radar picture into two areas and alternately synthesizing the half of Ka-band radar video and that of X-band radar video on each area at the same time to perform display. CONSTITUTION:A band antenna consisting of a Ka-band antenna 1 and an X-band antenna 2 is rotated and a radio wave is transmitted and received by a Ka-band transmitter-receiver 4 and a X-band transmitter-receiver 5. Ka- band radar video and X-band radar video are inputted to a correlation coupler 6 which in turn takes the correlation of the Ka-band radar video and X-band radar video not only to remove or reduce sea clutter but also to perform phase adjustment so as to be capable of alternately displaying the half of the Ka-band radar video and that of the X-band radar video on each of an area of 0-180 deg. and an area of 180-360 deg. obtained by dividing a radar picture to form a synthetic video signal.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hybrid radar suitable for use in navigation of ships.

(Prior Art) Various types of conventional marine radars emit radio waves output from a transmitter/receiver through an antenna that is rotationally driven by a rotational drive device, receive the reflected signal, and process it as a radar video. The radar video is displayed on the radar indicator.

(Problem to be Solved by the Invention) However, in such a marine radar, the number of rotations of the radar antenna is approximately 2 Or, p, m, and the time required for one rotation of the radar antenna, that is, one rotation of the sweep line. The time required is relatively long, approximately 3 seconds, so in the case of a motor boat traveling at high speed or a vessel that navigates in a curve or turns even at low speed, the reflected signals received by the radar may be discrete. This made it difficult to track other ships. Further, although it is sufficient to use two independent radars for the purpose of improving the ability to track other ships, it is difficult to equip two radars in the limited space on the radar mast. Furthermore, since the radar video displayed on the radar indicator includes sea clutter caused by waves, it is extremely difficult to identify a small vessel if it is present in the sea clutter. Ta.

The present invention was made to solve the above-mentioned problems, and it aims to improve the ability to track other ships without using two radars, and also improves the ability to identify small ships, etc. by eliminating the influence of sea clutter. The purpose of the present invention is to provide a hybrid radar for ships that can improve the

[Means for solving problems]

Therefore, in the marine hybrid radar according to the present invention, K
An antenna in which an a-band antenna and an a Ka-band transceiver for processing the video as Ka-band radar video;
an X-band transceiver that transmits radio waves and receives reflected signals via the X-band antenna of the antenna and processes them as an X-band radar video; the Ka-band antenna;
a double rotary joint forming dedicated waveguides between the A-band transceiver and the X-band antenna and the X-band transceiver, respectively;
The Ka-band radar video and the X-band radar video, each processed by a band transceiver, are input, and these two band radar videos are correlated to remove or reduce sea clutter, and the radar screen is divided into two.○°
Ka-band radar video corresponding to a region of ~180°, X-band radar video corresponding to a region of 180° to 360°, and Ka-band radar video corresponding to a region of 180° to 360° and region of O° to 180° The present invention is characterized by comprising a correlation combiner that forms a composite radar video by alternately combining X-band radar videos corresponding to There is.

[Effect]

Therefore, according to the marine hybrid radar configured as described above, the radar screen can be divided into two to obtain an angle of 0° to 18°.
0° and 180° to 360” (7) Half of the Ka-band radar video and half of the The radar video is updated every time the radar rotates 180°, which doubles the data rate. At the same time, correlating the Ka radar band radar video with the X radar band radar video eliminates sea clutter. or decrease, resulting in radar video with high discrimination ability.

〔Example〕

An embodiment of the marine hybrid radar according to the present invention will be described below with reference to the drawings. FIG. 1 is a block circuit diagram of a marine hybrid radar, and FIG. 2 is a diagram of its equipment configuration. In Figures 1 and 2, 1 is Ka
The band antenna 2 is an X-band antenna, and these Ka-band antenna 1 and X-band antenna 2 are combined back to back to form an integral radar antenna, which is rotated by a rotational drive mechanism built into a double rotary joint 3. It is designed to be driven. Also, 4 is a Ka band transmitter/receiver, 5
is an X-band transceiver, and these two band transceivers operate independently and transmit each Ka-band airborne signal through a dedicated waveguide in the dual rotary joint 3. ! 1 and the X-band antenna 2, and receive the reflected signals.
It is processed as A-band radar video and X-band radar video. Further, reference numeral 6 denotes a correlation combiner to which the Ka-band radar video and the X-band radar video processed by the Ka-band transceiver 4 and the X-band transceiver 5 are input, respectively.

It has a function that takes advantage of the difference in sea clutter between Ka-band radar video and X-band radar video and correlates both band radar videos. and 180" ~ 3
The composite radar video is created by adjusting the phase so that 1/2 of the Ka-band radar video and 1/2 of the X-band radar video can be displayed alternately on the 60").7
is a radar indicator that displays the composite radar video output from the correlation combiner 6.

In a marine hybrid radar with such a configuration,
A band antenna consisting of a Ka band antenna 1 and an
, m, when the Ka-band transceiver 4 and X
When radio waves are emitted from the band transceiver 5 via a band antenna and the reflected wave signals are received, the received signals are transmitted to the Ka band transceiver R4 and the X band transceiver 5, respectively, for Ka band radar video and X band radar video. The signal is then processed and input to the correlation combiner 6. The correlation combiner 6 correlates the Ka-band radar video and the
The phases are adjusted so that half of the Ka-band radar video and half of the X-band radar video can be displayed alternately in each region of 80° and 180° to 360°, thereby forming a composite video.

Then, this composite video is output to the radar indicator 7, so that the Ka-band radar video and X
Half of the band radar dodeo (0° to 180° or 180
360") are alternately synthesized and displayed simultaneously.

Therefore, the rotation speed of the radar antenna was reduced to approximately 2°r, p,
l'I1. Even if it is as it is, the rotation speed is about 4 Or, p, 1
．． This is equivalent to the time required for one rotation of the radar antenna when the radar antenna is raised to a maximum height, and the time required for updating the radar video can be shortened from about 3 seconds to about 1.5 seconds.

As described above, according to the marine hybrid radar according to this embodiment, the following effects can be obtained.

(1) Since the radar video can be updated in 1/2 the time compared to conventional methods without reducing the number of pulse hits per revolution of the radar antenna (the data rate can be doubled), the tracking ability of the target vessel is increased, and the intelligence etc. It can be applied to radars dedicated to unmanned ships, etc.

2) Since only one rotary drive device is required, the limited space on the radar mast can be handled in the same manner as before.

(3) When two radars are used, they must be synchronized and coordinates must be corrected due to differences in the equipment positions, but they are configured as one radar. So there is no need for that at all.

(4) Unlike when using two radars, radio waves are emitted from one point, so the direction of other ships at close range can be determined.

Accurate capture of distance, etc.

(5) Since sea clutter can be removed or reduced, the ability to identify small ships is improved, and it can be applied to radars for unmanned ships such as intelligent other ships.

It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, and it goes without saying that the present invention can be implemented with various modifications without changing the gist thereof.

〔Effect of the invention〕

As described above, according to the present invention, half of the Ka-band radar video and the half of the The radar data is displayed in a composite manner so that even if the rotational speed of the antenna rotation drive device remains the same, the radar data is updated every time the radar antenna rotates 180 degrees, thereby doubling the data rate. It is possible to improve the ability to track other ships without using two radars, and sea clutter can be eliminated or reduced by correlating the Ka radar band radar video and the X radar band radar video. Therefore, it is possible to provide a marine hybrid radar that can eliminate the influence of sea clutter and improve the ability to identify small ships and the like.

[Brief explanation of drawings]

1 and 2 show an embodiment of a hybrid radar for ships according to the present invention, respectively. FIG. 1 is a block circuit diagram thereof, and FIG. 2 is a diagram showing the equipment configuration. 1...Ka band antenna, 2...X band antenna, 3...double rotary joint,
4...Ka band transceiver, 5...X
Band transceiver, 6...Correlation combiner, 7...
...Radar indicator. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure 2

Claims (1)

[Claims] An antenna in which a Ka-band antenna and an X-band antenna are combined back to back and are integrally rotationally driven by a rotational drive device, and transmits radio waves and receives reflected signals thereof through the Ka-band antenna of this antenna. a Ka-band transceiver for processing Ka-band radar video;
an X-band transceiver that transmits radio waves and receives reflected signals via the X-band antenna of the antenna and processes them as an X-band radar video; the Ka-band antenna;
a double rotary joint forming dedicated waveguides between the A-band transceiver and the X-band antenna and the X-band transceiver, respectively;
The Ka-band radar video and the X-band radar video, each processed by a band transceiver, are input, and the two band radar videos are correlated to remove or reduce sea clutter, and the radar screen is divided into two to obtain 0°.
Ka-band radar video corresponding to an area of ~180°, X-band radar video corresponding to an area of 180° to 360°, and Ka-band radar video corresponding to an area of 180° to 360° and an area of 0° to 180° The present invention is characterized by comprising a correlation combiner that forms a composite radar video by alternately combining X-band radar videos corresponding to Hybrid radar for ships.