JPS61270682A - Wave display device of ship radar - Google Patents

Abstract

PURPOSE:To display and discriminate the height of waves in real time together with the moving direction by removing the distance component between waves and a transmitter-receiver from the level of its received radio wave signal and converting it into wave data having a signal level corresponding to the sectional area of reflection. CONSTITUTION:A radio wave transmitted by the transmitter-receiver 2 is reflected by waves on the sea surface and received. A distance correcting circuit 5 removes the distance component between the waves and transmitter-receiver from its received radio wave signal and converts it into the wave data having the signal level corresponding to the sectional area of the reflection. This wave data is stored in a memory 7 and past stored wave data are read out and reduced in signal level to 1/n by a 1/n multiplying circuit 8, so that the resulting data are inputted to a comparator 6. The comparator 6 compares the signal level of the past wave data reduced to 1/n with the signal level of the wave data outputted from the circuit 5 to input a higher-level signal to the memory 7 and also output it to a raster scan color display 9, thereby making a display where data are classified by colors according to the signal level.

Description

[Detailed Description of the Invention] [Industry-■2 Field of Application] The present invention processes reflections from waves No. 4.1 by a ship 1/-da, and displays the size and direction of the waves on the same screen 1-. This invention relates to a wave size device that can display wave size.

[Conventional technology]

Ship radars include, for example, STC (Sensitive
ityTime Control), CF A R (
Constant False AlarmRate)
and so on. However, their original purpose is to detect objects such as other ships and obstacles in the waves. Therefore, the configuration is such that information about waves from the ship's radar is canceled as unnecessary. Therefore, the size and direction of waves cannot be determined. However, recently, in order to prevent marine accidents caused by waves, technologies have been developed that actively utilize information from ship radars regarding waves.

For example, JP-A-60-22681 and JP-A-60-2
Japanese Patent No. 5468 discloses a technology related to processing wave information signals in a ship radar.

[Problem that the invention seeks to solve]

The present invention utilizes the technology disclosed in the publication No. 1-1 to provide a device that can simultaneously display the size and moving direction of waves, which has not existed in the past, and that is easy to observe. ] −1.

[Step-f to solve the problem]

The energy of received radio waves reflected by waves is affected by the reflection cross section of the waves (parameter of wave size) and the distance from the waves to the receiving device. 17 Therefore, by removing the distance component from the energy of the received radio waves, the intensity of the reflected radio waves at the wave reflecting surface (proportional to the reflection cross section) can be determined, and the size of the waves can be determined. The present invention has been made based on this knowledge.

Hereinafter, the configuration of the present invention will be explained using FIG. 1 corresponding to an embodiment.

As shown in the figure, the wave display device for a ship radar according to the present invention includes transmitting/receiving devices 1 and 2, a distance correction circuit 5, and a memory.
I am looking at l/n i8 circuit 8, comparator 6, and Rusk scan fist color display 1/i9.

The transmitting/receiving devices 1 and 2 are devices that transmit 7L waves toward the sea surface and receive the waves when they are reflected by 100-plane waves. The distance correction circuit 5 is a circuit that subtracts the distance component between the wave reflecting the radio waves from the sea surface and the transmitting/receiving device from the intensity of the received radio signal. The output is converted into wave data with a signal strength corresponding to the reflection cross section of the wave. The memory is a circuit that stores wave data input via the comparator 6. The 1/n multiplication circuit 8 reads out the wave data stored in the memory and calculates the signal strength as l
/nfi and manually operates the comparator 6. The comparator 6 compares the signal strength of the past wave data multiplied by l/n with the reliability strength of the wave data output from the distance correction circuit 5, and selects the stronger signal as the memory and raster scan color. Enter the information on the display 9. The raster scan color display 9 is a display device that displays colors according to the signal strength output from the comparator 6.

[Effect]

Since the configuration is as shown in 1-1, the strength of the received radio waves reflected by the waves does not include the distance parameter due to the distance correction circuit 5. In other words, the reflection cross section of the waves (i.e. This shows the size of the waves.

Therefore, the RuskScan Φ color display 9 displays images in different colors depending on the size of the waves.

Since there is a loop of memoria → l/n multiplication circuit 8 → comparator 6, as shown in FIG. Later, I/n times the past wave f(%
1/2X 152 is displayed.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a wave display device for a ship radar to which the present invention is applied.

As shown in the figure, a transmitting/receiving device is constituted by a radar antenna 1 and a transmitting/receiving device 2. On the output side of the transceiver 2, P P I (Plane Po5tionIn
An indicator 3 is connected to a distance correction circuit 5 via an A/D (analog/digital) converter 4. The output of the distance correction circuit 5 is connected to the negative input of the comparator 6. The output of the comparator 6 is connected to a video RAM 7 and a raster scan color display 9. An I/n multiplication circuit 8 is connected to the video RAM 7, and the 1/n multiplication circuit 8 is connected to the other input side of the comparator 6, which is different from the input mentioned above.

The transmitter/receiver 2 has a characteristic of logarithmically amplifying and detecting received radio waves, and having this characteristic improves the compatibility with the distance correction circuit 5. That is, since the strength of the received radio signal is inversely proportional to the cube of the distance from the waves to the antenna, it is easier to perform distance correction in the logarithmic domain. The distance correction circuit 5 performs distance correction based on the intensity signal and the distance signal of the input received radio waves, and is essentially a circuit that logarithmically calculates the cube of the distance to the intensity. The RuskScan φ color display 9 sorts the signal bullets IW output from the comparator 6 into eight stages 1 to 1 on the CRT display device 1i/f.
R-G-B according to the color signal specified for each signal bullet Ja
The pyroxene control is performed to form a color image (17). Note that the device 3 used for the finger if < device 3 can be a device used in a normal ship's rotor.

FIG. 2 is a diagram illustrating the movement of the wave display device for a ship's radar having the configuration described in 1 above. 20 to 22 indicate wave amplitude and intensity waveforms that can be outputted from the distance compensator 11 circuit 5 on the sgyan (one image plane) irj, respectively. Waves are on the horizontal axis T direction15
Move to 11Vl of 1 → 152 → 1.53 1, Teyu. 2
3 to 25 are the output waveforms of the comparator 6 at that time. The output waveform 23 does not include excessive wave data. In other words, the wave 151 is directly selected by the comparator 6. Wave 15 in output waveform 24
2 and read out the past wave 15 from the video RAM 7. is l/n (in i's circuit 8)/n times (n = 2 in the figure) I/2(n-) waves 1/2X
It has been reduced to 1.5 +. Furthermore, output waveform 2
5, the wave 152 in the output waveform 24 moves to the wave 153 12, and the past wave 1 read from the video RAM 7
Wave 1/2×15 where 52 is multiplied by I/n by l/n multiplication circuit 8
2, and the previous wave 1/2X 15 + also read out from the video RAM 7 is multiplied by 1/n by the l/n multiplication circuit 8 1/2X l/2X 1
Shown as 5+.

Therefore, on the RuskScan color display 9 to which the output waveforms 23 to 25 of the comparator 6 are input, current waves are displayed in different colors according to the magnitude of the input, and past waves are displayed according to the movement of the waves. As if the tail was trailing (
24 and 25), so the moving direction of the waves can also be identified.

〔Effect of the invention〕

As described in 1- above, the wave display device for a ship radar according to the present invention can display and identify the size of waves as well as the moving direction of the waves in real time. Therefore, safe navigation of ships,
This will contribute to efficient continuity and prevention of maritime accidents. In addition to waves, the moving direction of a single object can also be identified by display 17, so it can be used for purposes such as Lucky Sog.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a wave display device for a ship radar to which the present invention is applied, and FIG. 2 is a signal waveform diagram illustrating its operation. 1 radar antenna, 2 transceiver, 5,
2 distance complement IT circuits, 6 comparators, 7 memory, 8. ,,, 1/n times circuit, 9
Raster scan color display. □ ba) ('J

Claims (1)

[Claims] 1. A transmitting/receiving device that receives the transmitted radio waves after being reflected by waves on the sea surface, and subtracting the distance component between the sea waves and the transmitting/receiving device from the intensity of the received radio signal; A distance correction circuit that converts wave data to have a signal strength according to the reflection cross section, a memory that stores the wave data, and reads past wave data stored in the memory.
a circuit that multiplies the signal strength by 1/n; a comparator that compares the signal strength multiplied by 1/n of the past wave data with the signal strength of the wave data output from the distance correction circuit; and the comparator. 1. A wave display device for a ship radar, comprising a raster scan color display that displays colors according to the signal strength output from the ship radar.