JPS601588B2 - Radar information display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention provides distance-height display (Ra increase e
The present invention relates to a radar information display device that improves the display of a marker signal in a daily eight indicator (RHI).

Conventionally, in so-called radar RHI, radar information and marker signals regarding distance and height have been displayed simultaneously in synchronization with radar beam scanning.

For this reason, marker signals related to distance and height were generated as analog signals and displayed together with information reflected from the target by a commercial radar. However, in such conventional RHI display devices, the radar information on the display is displayed by sequentially sweeping radially with the radar installation point set at center D. On the other hand, since the marker signal on the display is displayed in a grid pattern, it does not match the normal display sweep, and as a result, the marker signal display, which should be linear, is distorted. There was a drawback that it was not clearly depicted. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a radar information display device that can clearly display a marker signal together with a radar video signal. Embodiments of the present invention will be described in detail below with reference to FIGS. 1 to 5.

FIG. 1 shows an embodiment of a radar information display device according to the present invention.

That is, the antenna for transmitting and receiving radar waves is 1 and the radar device 2 is
connected to.

The radar device 2 derives a target reflection signal from the target, and the signal is supplied to a quantizer 3.

On the other hand, the angle in the elevation direction of the antenna 1, that is, the height angle, is detected by the height angle detector 4 of the antenna 1, and the height angle of the antenna obtained in this step is supplied to the height angle generator 5.

The height angle generator 5 generates an angle signal corresponding to the height angle of the antenna 1. This angle signal is supplied to the timing pulse generator 6, which derives a pulse signal corresponding to the rotation angle of the antenna 1. It is supplied to the quantizer 3.

Therefore, the quantizer 3 quantizes the radar information from the radar device 2 in the distance direction and in the video amplitude direction based on the timing pulse signal from the timing pulse generator 6.

The radar video signal quantized by the quantizer 3 is supplied to an analog-to-digital (A/D) converter 7, where it is converted into a digital signal and then supplied to a storage device 8. Since the timing stored in the storage device 8 is normally performed in synchronization with the quantization timing in the quantizer 3, the timing signal is supplied from the timing pulse generator 6 and stored sequentially. The radar information once stored in the storage device 8 is then sequentially read out and displayed, but the readout timing can be made asynchronously and completely independently of the radar scanning timing of the radar device 2. In order to perform so-called high-brightness display, reading and displaying is performed at high speed.

A green readout signal, which is the basis for the high-speed readout display, is obtained from a sweep oscillator 9, and is sequentially read out from the memory 8 based on a readout timing signal from the oscillator 9. The radar information sequentially read out from the memory 8 is supplied to a digital-to-analog (D/A) converter 10, converted into an analog signal for display, and supplied to a video switch 11.

On the other hand, the read timing signal generated by the sweep oscillator 9 serves as a basic signal that regulates the read timing of the memory 8 and at the same time controls the display timing. Therefore, the output signal of the sweep oscillator 9 is simultaneously supplied to the marker signal generator 12, the RHI signal generator 13, and the marker display sweep signal generator 14, respectively, to control the signal generation timing of each of these generators.

A marker signal generator 12 generates a video marker signal for display in the distance direction and height direction, and transmits the video marker signal to the video switch 1.
1 and mixed with the digital-to-analog converter 10 output.

Note that when the output of the marker signal generator 12 is obtained as a digital signal, it is not directly supplied to the video switching device 11, but is switched and supplied in advance via a digital-to-analog converter.

The RHI bridge signal generator 13 generates a sweep signal for displaying the radar video signal Rm from the digital-to-analog converter 10, and usually generates a horizontal X-axis sweep signal x and a vertical Y-axis sweep signal y, respectively. Derivation and display sliding door 1
Supply to 5.

Furthermore, the marker display sweep signal generator 14 is for actually displaying the display video marker signal from the marker signal generator 12, and generates a horizontal X-axis sweep signal x' and a vertical Y-axis sweep signal y'. are respectively derived and supplied to the display switching device 15. The display switch 15 switches the sweep signals from the Rm sweep signal generator 13 and the marker signal generator 14 and supplies them to the display 16. That is, the horizontal axis sweep signal x or x' and the vertical axis sweep signal y or y' from the display controller 15 are respectively supplied to the horizontal deflection plate and the vertical deflection plate of the display device 16 such as a cathode ray tube, and the RHI display When displaying a marker, a normal radar video is displayed, and when displaying a marker, a signal from the marker signal generator 12 is switched and displayed. The operation of one embodiment of the present invention configured as described above is illustrated in FIGS. 2 to 5.
This will be explained in more detail with reference to the drawings.

2 and 3 are diagrams showing the screen of the display 16 when RHI is displayed and the same screen of the display 16 when displaying a marker signal in the apparatus shown in FIG. 1, respectively.

First, the display screen shown in FIG. 2 shows how the RHI radar video signal from the digital-to-analog converter 10 is supplied to the display 16 via the video switch 11.

At this time, the sweep signals x and y from the RHI signal generator 13 are selected by the display panel 15 as the sweep signals for display on the display 16. That is, the display sweep signal from the display switching device 15 at this time is such that the signal x shown in the first frame period among the horizontal x axis sweep signals shown in FIG. 4a is the horizontal axis sweep signal. Further, among the vertical Y-axis sweep signals shown in FIG. 4B, the signal y shown in the first frame section is also supplied.

As a result, among the sweep signals shown in FIGS. 4a and 4b, the sweep signal shown in the first frame period is supplied to the display 16, so that the RHI is moved in the direction shown by the arrow A in FIG.
Information is displayed sequentially.

Next, when the display panel 15 displays a marker, it is a marker display signal generator that selects y' and supplies it to the display 16. Distance direction markers 1, 12, 13, 14 and height direction markers h, , h2, h3, . . . h5 are displayed. A feature of the present invention is that this marker display is performed at different times from the RHI display, and as shown in FIG.
The frames are alternated to provide the original RHI display.

That is, first, the horizontal axis sweep signal x' for marker display is as shown in Fig. 4a.
Similarly, the marker display vertical axis sweep signal y' is expressed as a linear sweep signal as shown in the second frame of FIG. 4B.

Therefore, at this time, during the second frame sweep, the marker signal generator 12 sends an altitude (height direction) marker signal as shown in FIG. 5a and a distance direction marker signal as shown in FIG. The display 161 is supplied via the display. Although the waveform shown in FIG. 5 is shown in a large size for convenience of explanation, in reality, only the linear marker signal shown in FIG. 3 is drawn, so the amount of marker signal shown in a frame is small.

Note that in FIGS. 4 and 5, the pause period t after the sweep period indicates the retrace period. The device of the present invention is configured as described above, and the marker signal is provided with a dedicated sweep display circuit for the marker signal, and is configured to be able to display normal RHI and Kirifusuma.
The display of the marker signal is significantly clearer and has better linearity than before. In particular, the device of the present invention is suitable for temporarily storing a video signal or the like in a memory device and subsequently reading out the stored information at high speed, and its practical effects are great when applied to high-brightness display devices. .

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the radar information display device according to the present invention, FIG. 2 is a waveform diagram showing a sweep wave of the RHI display of the device shown in FIG. 1, and FIG. 3 is the same as that shown in FIG. FIG. 4 is a waveform diagram showing an example of the marker display of the device shown in FIG. 1, and FIG.
FIG. 2 shows an output waveform diagram of the marker signal generator of the device shown in the figure. 1: Antenna, 2: Radar device, 3: Quantizer, 8: Memory, 9: Sweep oscillator, 11: Video switch, 12: Marker signal generator, 15: Display switch, 16: Display. ※′
Figure 2 Figure 2 Figure J Figure Figure 3

Claims (1)

[Claims] 1. A quantizer that quantizes the radar information from the target obtained by scanning the radar beam synchronously, a memory that stores the information quantized by this quantizer, and a A timing signal generator that determines information read timing, a marker signal generator that is connected to this timing signal generator and generates marker signals in the distance direction and height direction of radar information, and signals from this marker signal generator. a first switch that switches between and outputs the radar information from the memory; a sweep signal generator that generates a sweep signal for displaying the radar information from the memory; and a sweep signal generator that is provided separately from the sweep signal generator. a marker display sweep signal generator that generates a sweep signal for displaying the marker signal; and a marker display sweep signal generator that is supplied with a sweep signal from the marker display sweep signal generator and the sweep signal generator, and that outputs a marker signal from the first switch. a second switch that selects and outputs a sweep signal for displaying the marker signal when the marker signal is output; and a display that displays the first output signal after being swept by the output signal of the second switch. radar information display device.