JPS62153787A - Radar automatic change-over apparatus for ship - Google Patents

Abstract

PURPOSE:To obtain high quality video over an entire area, by synthesizing videos obtained from S-band radar, Ka-band radar and X-band radar and synthesizing the video of each radar allotted according to distance. CONSTITUTION:The video of each band is inputted to a video synthesizer 40 using S-band radar 10, Ka-band radar 20 and X-band radar 30 respectively taking charge of specific distance fields. In this video synthesizer 40, the videos of the radars 10, 20, 30 allotted according to respective distances are synthesized. When intensive clutter is generated due to weather conditions and ocean weather conditions, said clutter is detected by intensive clutter detectors 25, 35 to send out a band change-over signal to the distance selector 43 of the video synthesizer 40.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a marine radar automatic switching device suitable for use in safe navigation of a marine vessel.

(Conventional technology) Ka-band radar is a conventional marine radar.

There are various types of radar such as X-band radar and S-band radar, but they are all used independently, and when clutter is strong, the navigator manually switches the X-band radar to S.
I used to switch to band radar and use it.

(Problem to be solved by the invention) By the way, the above-mentioned marine radar is one of the most important navigational instruments!
Ik is an important item, and is essential for collision prevention during night navigation, narrow waterways, and navigation within ports. but,
Depending on the degree of marine weather conditions, g-clutter and rain clutter may be so strong that it may be difficult to recognize obstacles with medium- to short-range radar. Therefore, in such a case, it is necessary to switch the radar as expected and to switch the radar back to its original state when the environmental conditions are restored, but this requires manual switching work. Therefore, in order to promote labor saving and unmanned operation, it is necessary to automate this switching work, but in order to do so, it is necessary to automatically supply reliable, high-quality video signals to the collision prevention system at all times, so that it can be unmanned. It must be possible to navigate safely by

The present invention was made to solve the above-mentioned problems, and it is possible to always synthesize and display videos with less clutter while making use of the distance distribution unique to each of the Ka-band, X-band, and S-band radars, and with high quality. An object of the present invention is to provide a radar automatic switching device for a ship that can greatly contribute to safe navigation by unmanned operation by providing a video signal of the collision prevention device to a collision prevention device.

[Means for solving problems]

The automatic radar switching device for ships according to the present invention includes an antenna, a transceiver that emits radio waves via the antenna, receives the reflected wave signal, and outputs radar video, and stores the radar video output from the transceiver. An S-band radar equipped with a buffer memory, an antenna, a transceiver that emits radio waves via the antenna, receives reflected wave signals, and outputs radar video, and processes the radar video output from the transceiver. an X-band radar and a Ka-band radar each including a strong clutter detector for detecting the presence or absence of strong clutter; and a buffer memory for storing radar video output from the transceiver; and a radar video output from the buffer memory of each of the band radars. A timing matcher that matches the entire radar video, a coordinate converter that converts the radar video of each band matched by this timing matcher into one coordinate, and each band whose coordinates have been transformed by this coordinate converter. At the same time, the outputs of the strong clutter detectors of the X-band radar and Ka-band radar are input, and when strong clutter is detected by the strong clutter detector of the X-band radar, the X-band radar video and the S The boundary of the reception distance of the band radar video is automatically shifted to the short distance side, and when strong clutter is detected by the strong clutter detector of the Ka band radar, the reception of the Ka band radar video and the X band radar video is performed. A distance selector that automatically shifts the distance boundary to the short distance side, and a display memory that combines and stores the radar video of each band output from this distance selector into one screen according to the receiving distance range. The video synthesizer is equipped with a video synthesizer, and a radar indicator that displays a synthesized video according to the receiving distance range of the radar video of each band stored in the display memory of the video synthesizer.

[Effect]

According to the marine radar automatic switching device having such a configuration, when the strong clutter detector of the X-band radar detects strong clutter, the distance selector of the video synthesizer narrows the maximum distance range that the X-band radar can accept, and the clutter is detected. Clutter is reduced by reducing the minimum distance range for the S-band radar, which is strong against clutter, and when the strong clutter detector of the Ka-band radar detects strong clutter, the distance selector of the video synthesizer is used to reduce the range of the Ka-band radar for clutter. Reduce the maximum distance range,
It is possible to reduce clutter by reducing the minimum distance range supported by the X-band radar, and therefore the composite video of the S-band, X-band, and Ka-band radar videos output from the distance selector has less clutter. In addition, the display memory can always provide a high quality video signal with a high S/C ratio to the radar indicator and output it to the collision prevention ¥R1.

(Embodiment) An embodiment of the marine radar automatic switching device according to the present invention will be described below with reference to the drawings. Fig. 1 is a block circuit diagram of the marine radar automatic switching device, and Fig. 2 is a device configuration diagram thereof. In Figures 1 and 2, 1o is an S-band radar that has good transmittance for rain and snow and is suitable for long distances, but has poor resolution. A transceiver 12 that emits radio waves, receives the reflected signal, and outputs radar video.Interference from radio waves from other ships is removed from the radar video output from this transceiver 12.

It is comprised of a video processor 13 that performs CFAR processing, integral processing, etc., and a buffer memory 14 that stores the radar video processed by this video processor 13. Reference numeral 20 is a Ka-band radar which has poor transmittance through rain, snow, etc. and is suitable for short distances, but has good resolution. A transmitter/receiver 22 that receives wave signals and outputs radar video.The radar video output from this transmitter/receiver 22 is used to remove interference caused by radio waves from other ships.C
A video processor 23 that performs FAR processing, integral processing, etc. A buffer 24 stores the radar video processed by the video processor 23, and processes the radar video output from the transceiver 22 (autocorrelation detection, correlation threshold).

It is comprised of a strong clutter detector 25 that detects the presence or absence of strong clutter using a strong clutter (intensity threshold). Reference numeral 30 denotes an X-band radar with characteristics intermediate between the S-band radar 10 and the Ka-band radar 20. memory 34
and a strong clutter detector 35. Also,
40 is a video synthesizer, and this video synthesizer 40 is connected to the buffer memory 14. of each band radar 10.20.30.
24. A timing matching device 41 that matches the timing of the entire radar video output from 34. The timing matching device 41 adjusts the timing of the entire radar video output from 34. The radar video of each band matched by this timing matching device 41 has different coordinates depending on the installation position of the radar. a coordinate converter 42 for converting the coordinates to match one coordinate. A distance i1 selector 43 to which the radar video of each band coordinate-transformed by the coordinate converter 42 is input, and the outputs of the strong clutter detectors 35 and 25 of the X-band radar 30 and Ka-band radar 20 are respectively input. and a display memory 44 that stores the radar video of each band output from the distance selector 43. Here, when strong clutter is detected by the strong clutter detector 35 of the X-band radar 30, the distance selector 43 automatically changes the receiving distance boundary between the X-band radar video and the S-band radar video to the short distance side. When strong clutter is detected by the strong clutter detector 25 of the Ka-band radar 20, the boundary between the receiving distances of the Ka-band radar video and the X-band radar video is automatically shifted to the short-range side. In addition, the display memory 44 combines and stores the radar video of each band output from the distance selector 43 into one screen according to the receiving distance range, and the combined video signal is used for collision prevention@ It can be supplied at any location. Furthermore, 50 is a radar indicator that displays a composite video according to the receiving distance range of the radar video of each band stored in the display memory 44 of the video composite device 40.

Next, the operation of the marine radar automatic switching device configured as described above will be described.

S-band radar 10. In the Ka-band radar 20 and the X-band radar 30, when radio waves are emitted from each transmitter/receiver 12° 22.32 via the antennas 11, 21.31 and the reflected wave signals are received, the received signals are Video processed by video processing machine 13.23.33
is output to.

These video processing units 113, 23, and 33 remove interference from radio waves from other ships with respect to the video.

CFAR11! 14, 24, and 34, respectively. The video output from the buffer memory 14, 24, 34 enters the video composition 140, where the timing matcher 41 first matches the overall timing, and then the coordinate converter 42
The distance selector 43 converts the different coordinates due to the difference in the installation position of the radar into one coordinate, and selects the distance using the distance selector 43.

In other words, the coverage distance range of each radar is determined, and the result is combined into one screen and stored in the display memory 44.

When the composite video stored in the display memory 44 is read out, it is displayed on the radar indicator 5o and is also output to a collision prevention device (not shown). Here, in the KaS band radar 20 and the Since it is stored in the display screen 44 as a composite video corresponding to a specific distance field, it is displayed on the radar indicator 50 in each band range as shown in the center of the figure. Further, when the strong clutter detector 25 of the KaS band radar 20 detects strong clutter, the distance selector 4 of the video synthesizer 40 is connected to the strong clutter detector 25.
3 is given a Ka band to X band switching signal. Therefore, the distance selector 43 stores the synthesized video in the display memory 44 as a composite video in which the A-band coverage distance boundary is made smaller and the X-band coverage distance boundary is widened, so the radar indicator 50 Each band range as shown in the diagram is displayed, and a composite screen with less clutter as a whole is automatically maintained.On the contrary, when the strong clutter detector 35 of only the X-band radar 30 detects strong clutter In this case, since the strong clutter detector 35 gives the X-band S-band switching signal to the [1 selector 43 of the video synthesizer 40, the distance 11 selector 43 reduces the receiving distance boundary of the X band. In addition, it is stored in the display memory 44 as a composite video in which the reception distance boundary of the S band is expanded, and therefore, although not shown in the figure, the composite screen of each band with less clutter as a whole is automatically maintained in the radar indicator 50. Zarani KaS band radar 20 and X band radar 3
When both strong clutter detectors 25.35 of 0 detect strong clutter, signals of Ka band to x band, Since the switching signal is given, this distance selector 43 stores in the display memory 44 as a composite video in which the range boundaries of the Ka band and Each band range as shown on the left side of the figure is displayed on the device 50, and a synthesized screen with less clutter as a whole is automatically maintained.

In this example, video of each band is synthesized using the S-band radar, the KaS-band radar 20, and the X-band radar 30, each of which is responsible for its own distance field.
0, and here the videos of each radar distributed according to their respective distances are combined, so this composite video can be made into a high quality video over the entire area. In addition, even if strong clutter occurs depending on weather and ocean conditions, the KaS
The strong clutter detectors 25 and 35 built into each of the band radar 20 and the X-band radar 30 automatically detect the strong clutter and send a band switching signal to the distance selector 43 of the video composition 11140. (The X-band radar 30 may temporarily take over part or all of the coverage distance of the S-band radar 20, or
Since the video of each radar is synthesized as a distance range in which the S-band radar 40 temporarily covers a part of the coverage distance of S-band radar 40, the synthesized video always has a high S/C ratio. Can be maintained automatically.

Therefore, a high quality video signal can always be automatically supplied to a collision prevention device in a streamlined ship or an unmanned ship, greatly contributing to safe navigation.

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 various modifications can be made without changing the gist of the invention.

〔Effect of the invention) As mentioned above, according to the present invention, the Ka band.

By making use of the unique handling distances of X-band and S-band radars, we are able to always synthesize and display videos with less clutter and provide high-quality video signals to collision prevention devices, thereby increasing safety through unmanned operation. It is possible to provide an automatic radar switching device for ships that can greatly contribute to navigation.

[Brief explanation of drawings]

1 and 2 show an embodiment of an automatic radar switching device for ships according to the present invention, with FIG. 1 being a block circuit diagram thereof, and FIG. 2 being a device configuration diagram. 10...S band radar, 20...K
A-band radar, 30...X-band radar, 1
1,21゜31・・・Aerial, 12.22.32
...Transmitter/receiver, 13.23.33...
Video processor, 14, 24° 34... Buffer memory, 4o... Video composite machine, 41...
...Timing matcher, 42...Coordinate converter, 43
...Immediate release selector, 44...Display memory, 5
0...Radar indicator.

Claims (1)

[Claims] an S-band radar comprising an antenna, a transceiver that emits radio waves via the antenna and receives reflected wave signals to output radar video, and a buffer memory that stores the radar video output from the transceiver; An antenna, a transceiver that emits radio waves through the antenna, receives the reflected wave signal, and outputs radar video, and a strong clutter that processes the radar video output from the transceiver to detect the presence or absence of strong clutter. An X-band radar and a Ka-band radar each having a detector and a buffer memory for storing radar video output from the transceiver, and a timing matching device for aligning the entire radar video output from the buffer memory of each band radar. , 1 for each band radar video matched by this timing matcher.
A coordinate converter converts the coordinates into two coordinates, the radar video of each band whose coordinates have been converted by this coordinate converter is inputted, and the outputs of the strong clutter detectors of the X-band radar and Ka-band radar are respectively inputted, and the X-band When strong clutter is detected by the strong clutter detector of the radar, the boundary between the receiving distances of the X-band radar video and the S-band radar video is automatically shifted to the short range side, and the strong clutter detector of the Ka-band radar A distance selector that automatically shifts the receiving distance boundary between Ka-band radar video and X-band radar video to the short-range side when strong clutter is detected; A video composite machine equipped with a display memory that combines and stores one screen worth of data according to the receiving distance range, and a video composite machine that combines radar video of each band stored in the display memory of this video composite machine according to the receiving distance range. 1. A radar automatic switching device for ships, comprising a radar indicator that displays a composite video.