JPH0138538Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention relates to a display device that displays a PPI screen of a radar, sonar, etc. in color.

[Prior Art] Generally, when displaying a radar or sonar PPI screen in color, it is common to display the PPI screen in different colors depending on the strength of the detection signal.

In addition, Japanese Patent Laid-Open No. 50-40091 discloses a method for identifying signals of a target by using signals in which the continuous length of each signal in these detection signals is longer than the continuous length estimated from the size of the object. taught by.

[Problems to be solved by the invention] There are many points in which it is unreasonable to identify all targets using only the above-mentioned discrimination means. Furthermore, although it is simple to display the signals in different colors based only on signal strength, it is also unreasonable.

Therefore, it would be convenient for observers to have a practical device that appropriately combines these.

This invention is intended to solve the problem of providing this convenient device at low cost with a simple configuration.

[Means for solving the problem] This invention examines the degree of continuation of the detected signal at a specific intensity level or above, displays the signal in different colors, and also displays the lowest continuation of the continuation degree of the detected signal. By providing a means to display the following signals in different colors according to their intensity,
This is designed to solve the above problems.

Furthermore, it is possible to make things more convenient by making the color separation display based on continuity and the color separation display based on intensity different in tone, or by providing a means to switch between these color separation displays. , which can be provided.

[Example] Examples will be described below with reference to the drawings.

In FIG. 1, the detection signal received by a receiver 1 is generally a polar coordinate signal in radar or sonar, so it is converted to rectangular coordinates through a scan converter 2, etc., converted to a digital signal by an AD converter 3, and then stored in a storage device 4. to be recorded.

On the other hand, in synchronization with the scanning of the color display, records of the corresponding point and its surroundings are constantly read out from the recording device 4, and the digital signal has a certain digital value or more, that is, each signal of the detection signal has a certain intensity level. (hereinafter referred to as a specific intensity level), the continuity discrimination circuit 5 checks the degree of continuity, and the corresponding color is determined and displayed on the color display 6.

FIG. 2 shows an example of the recorded contents of the storage device.

Here, the diagonally shaded portion represents a recording of "1", ie, that a received signal was received, and the white portion represents a recording of "0", that is, that there was no received signal. A is a record corresponding to land, and B and C are records corresponding to a ship.

This is read out and displayed in order from the left end in accordance with the scanning of the display 6. For example, when displaying a point corresponding to point a, the continuity identification circuit 5 records the point a in the storage device 4 and displays it. Read and count the connected records in order over a certain range and check how many are consecutive. For example, if there are 8 or more consecutive records, it will be brown, if 4 to 7 consecutive records, it will be yellow, and if there are 3 or less records, it will be yellow. It is displayed on the color display 6 as red.

Such a continuity identification circuit can be constructed using a computer or the like. Therefore, when the record shown in FIG. 2 is displayed on the color display 6, the land area A is displayed in brown, and the ship areas B and C are displayed in red, so that the land area and the ship area are clearly separated. The edge of the land near point b may turn yellow depending on the method used to identify continuity.
When displaying point a, it is ideal to check continuity in a certain area centered on point a, but
It is generally satisfactory to check the continuity of columns and/or rows containing points.

Now, suppose that the records in the storage device 4 are read out in order from left to right in FIG.
Continuity identification in the row direction can be constructed relatively easily as shown in FIG.

In FIG. 3, signals read from the storage device 4 are sequentially input into an 8-bit shift register 51.

It is assumed that the signal is shifted to the right every time a new signal is read out, and is shifted out from the right end and disappears.

There are an 8-bit consecutive detection circuit 53 and a 4-bit consecutive detection circuit 52 connected to the output of each digit of the shift register 51, which detect 8 consecutive bits and 4 bits consecutively, respectively, and connect a flip-flop 55 for detecting 8 bits or more and a flip-flop for detecting 4 bits or more. 54
Set. In addition, flip-flops 54, 5
5, if the flip-flop 55 is reset when the right end of the shift register 51 becomes "0", the flip-flop 55 will be reset when the head reaches the right end of the shift register 51 when the signal "1" continues for 8 or more bits. When a continuous signal passes and the right end of the shift register 51 becomes "0", it is reset to "0". Similarly, when a continuous signal of 4 bits or more is received, the flip-flop 54 becomes "1" while the signal continues.

The rightmost outputs of the flip-flops 54 and 55 and the shift register 51 are put into a color-coded circuit 56 consisting of a simple AND circuit, so that when 8 bits or more are consecutive, the output from terminal B displays brown, and from 4 bits Continuous 7 bits are output from the Y terminal and displayed in yellow, and 3 or less bits are output from the R terminal and displayed in red to identify continuity.

Two other examples of continuity identification circuits are shown in FIGS. 4 and 5. The example shown in FIG. 4 is an example in which a one-shot multivibrator is used.The one-shot multivibrator 510 is triggered (T terminal) at the rising edge of a signal and outputs a pulse having a pulse width of, for example, 4 consecutive bits. If the signal becomes "0" during this time, the one-shot multivibrator 510 is reset and the pulse disappears. When the AND circuit 511 performs a logical product of the negative output of the multivibrator 510 and the input signal, the output becomes "1" when the input signal is 4 bits or more consecutively. This detects 4 or more consecutive bits, but has the disadvantage that the first 4 bits are multiplied, but it has an extremely simple circuit configuration.

The example shown in FIG. 5 is an example configured with a counter. The counter 520 is an up-down counter, and counts positively when the signal is "1", and counts when the signal is "0".
shall be counted negatively. Also, the maximum count value is, for example, up to "4", and any more than that, the signal is "1".
It is assumed that the signal remains at "4" even if the signal is received, the minimum count value is "0", and even if the signal "0" is received any more, it remains at "0". When counter 520 reaches “4”, flip-flop 5
21, and reset when it becomes "0".
In this way, when the signal "1" is substantially continuous for 4 bits or more, the output becomes "1", and when the signal "0" is substantially continuous for 4 bits or more after that, the output becomes "0". In this case, the signal is integrated by a counter, so it is resistant to noise.

As described above, for things above a specific intensity level, the continuity is identified, and the degree of continuity in the identification of the continuity is less than the lowest continuous bit, that is, the degree of continuity is less than the value specified as the lowest continuous value. The color corresponding to each signal intensity is determined by the intensity classification circuit 7 and displayed on the color display 6. In this case, it is preferable that the color tone when continuity is identified is different from the color tone for each intensity. Further, by providing a switching operation 8 or the like, it is also possible to switch between color classification based on intensity and color classification based on continuity.

As illustrated in FIGS. 4 and 5, the continuity identification circuit 5 can be used to identify land and ships in one step, as shown in FIGS. 4 and 5, but if necessary, as shown in FIG. The identification may be performed in two or more stages, and the number of consecutive bits may be determined as appropriate depending on the size of the target object, the roughness of the screen, etc.

Further, the color tone may be appropriately selected so that the contrast object can be intuitively recognized.

[Effects of the invention] According to this invention, for example, in the case of radar, different colors can be displayed for land areas, ships, etc. where the intensity level of the detection signal is above a certain level by color-coding for continuity identification, and Signals with a relatively short continuity similar to or similar to those of ships include signals from large and small ships, birds, buoys, etc. These signals can be displayed in different colors according to their strength, making it convenient for observers. It's convenient.

In addition, the signals mentioned above, which have a relatively large number of types and have a short continuity, are color-coded by intensity, and the signals, which have a small number of types, such as land and ships, are color-coded by continuous length, so the configuration of the continuity identification circuit, etc. It has the advantage of being easy to complete and providing accurate color display through stable identification.

Further, it is unnecessary to explain that the method can be similarly applied to underwater detection signals such as sonar, and signals of detection targets such as fish, plankton, and the seafloor.

[Brief explanation of the drawing]

The drawings show an embodiment, and FIG. 1 is a block configuration diagram.
FIG. 2 is a schematic diagram of the memory contents, and FIGS. 3 to 5 are circuit configuration diagrams of main parts. 1...Receiver, 2...Scan converter,
3...AD converter, 4...Storage device, 5...Continuity identification circuit, 51...Shift register, 52...
...4-bit continuous detection circuit, 53...8-bit continuous detection circuit, 54...Flip-flop for detecting 4 bits or more, 55...Flip-flop for detecting 8 bits or more, 56...Color-specific circuit, 510...One-shot multivibrator, 511 ...Logic product circuit, 520...Counter, 521...Flip-flop, 6...Color display, 7...Intensity-based circuit, 8...Switching operation, A...Record corresponding to land, B, C... Records corresponding to the ship, a, b...Record points in the storage device.

Claims (1)

[Claims for Utility Model Registration] A color display device for displaying detection signals of radar, sonar, etc., which: a) identifies the continuity of each signal in the detection signals having a specific intensity level or higher; (b) intensity-based color separation means for color-coding and displaying signals according to intensity, for signals whose degree of continuity for identifying continuity is equal to or less than a value defined as the lowest continuous value; A color detection display device comprising: