JPS6157872A - Signal processor - Google Patents

Abstract

PURPOSE:To eliminate the miss of target detection due to an error in manual map specification by allowing only the area of a manual map to be specified on a radar equipment. CONSTITUTION:A function for setting only the area of the manual map independently in addition to a manual map setting function is given to a manual map setting circuit 54, and when a map area signal of symbol character data on only information regarding a map area is supplied though an output line 501, radar information on the map area is displayed on the CRT7 of an indicating device. The reception blanking of the specified map area, setting and switching of a high detection threshold level, etc., are performed corresponding to a clutter, etc., according to a map area specification end signal from the circuit 54 after confirmation by display observation, thereby eliminating the miss of target detection due to an error in manual map setting.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a signal processing device, and particularly to a signal processing device for a radar device.

[Prior art]

A signal processing device that detects a signal related to a radar target from a radar reception signal and further extracts azimuth information and distance information is well known.

The direction and distance information of the radar target extracted by this signal processing device undergoes predetermined data processing via a data processing device, etc., and is sent to the CRT (Cathode Ray Tube) of the indicating device as symbol data in digital format.
Usually, the general operation method is to display images using .

In addition to the radar target, the above-mentioned video display displays input received signals that exceed the detection threshold level, and also includes ground clutter caused by the ground and ground structures near the installation location of the radar equipment - weather clutter caused by weather conditions. -ya chaff
Reflected pulse inputs due to artificially deceptive reflectors such as the following are displayed.

For these unnecessary reflected pulses from reflectors other than the radar target, reception or detection is suppressed over the range of influence that can be determined by taking into consideration the CR and T display contents of the indicating device and the known operational conditions of the radar device. Negative measures will be taken. Specifically, in order to prevent the above-mentioned unnecessary reflected pulses from being displayed, the receiving device may apply reception blanking to suppress unnecessary reflected pulse input in the target range, or the signal processing device may set the threshold level for signal detection. It is commonly used to raise. In other words, the area as the receiving range of unnecessary reflections (
Direct specification of so-called manual maps is generally used, in which a user sets an area) and then manually performs reception blanking, high-level detection threshold settings, etc. for this area while monitoring the display video. has been done. Furthermore, the target detection level directly designated in this way on the manual map is also used as a detection reference level for detecting radar targets on the manual map.

However, in this type of conventional manual map direct designation, there is a drawback that a designation error in the input data to be designated in area setting is likely to occur, and as a result, the radar target may not be detected.

[Purpose of the invention]

The object of the present invention is to eliminate the above-mentioned drawbacks and to provide a signal processing device for a radar device, which is equipped with a manual map setting means that can also set only the area, and fundamentally eliminates mistakes in target detection due to incorrect manual map specification. It is about providing.

[Structure of the invention]

The device of the present invention is a signal processing device in a radar device, and is a manual map setting means that allows setting only the area of the manual map in setting the manual map for determining detection criteria for detecting a radar target. It is composed of:

〔Example〕

Next, the present invention will be described in detail with reference to the drawings.

The embodiment shown in FIG. 1 is an antenna 1. Transmission/reception switch 2゜Transmission device 3. Receiving device 4. Signal processing device5. Data processing device 6
Of these components, the signal processing device 5 is directly related to the present invention, and the others are devices that together with the signal processing device 5 constitute the radar device.

An antenna 1 receives a transmission pulse in a predetermined signal format from a transmitting device 3 via a transmission/reception switch 2, converts it into a transmission beam with a predetermined directional characteristic, and transmits it at a transmission rate corresponding to the distance range for the operational coverage area. While firing, the weapon normally rotates and fires at a predetermined rotation rate over a 360 degree azimuth. A received pulse obtained in response to this transmission is supplied to a receiving device 4 via a transmitting/receiving switch 2.

The signal processing device 5 includes a signal detection circuit 51. Direction detection circuit 52
．． It is comprised of a distance detection circuit 53, a manual map setting circuit 54, etc., and its basic operation is as follows.

That is, the received output of the receiving device 4 is supplied to the signal detection circuit 51 via the output line 401.

The signal detection circuit 51 extracts a component that is coherent with the transmission signal from the received output exceeding a preset detection threshold level, and supplies this to the direction detection circuit 52 and the distance detection circuit 53.

The direction detection circuit 52 and the distance detection circuit 53 detect the input direction and distance, respectively, and output lines 521 and 531.
The data is supplied to the data processing device 6 via.

Based on the direction and distance output thus input, the data processing device 6 converts the received signal detected by the signal detection circuit 51 into a video signal for each display pixel, and displays this on the CRT of the indicating device 7. In this case, what is displayed as an image on the CRT of the indicating device 7 is not only the reflected pulse from the radar target but also the reflected pulse from the aforementioned ground clutter, weather clutter 9, chaff, etc., which has coherency with the transmitted pulse. Moreover, if it is above the detection threshold level, it will be converted into a video signal and imaged on CB and T, similar to the reflected pulse from a radar target. To deal with this problem, a manual map is set so that the images in the relevant display range can be removed, taking into consideration the images on CR and T, the installation conditions of the radar device, etc. In this manual map, while monitoring the image of the radar device coverage area displayed on the CRT of the indicating device 7, the influence range of the above-mentioned clutter, etc., that is, the manual map area is set, and the signal for the reception input within this area is set. The video display caused by these clutters is suppressed by raising the detection threshold level, lowering the receiving sensitivity, or the like.

In this manual map setting, the map area is first manually set. For example, in the case of a ground clutter, a manual map setting signal in digital format is sent to the output line 501 based on the area and level of the ground clutter that have been obtained in advance from the radar installation conditions and the CRT display of the indicating device 7. Manual map setting circuit 54 via
From there, the ground clutter display within the map area is sent to the indicating device 7 to remove it. This operation is performed by reducing the receiving sensitivity within the map area in accordance with the ground clutter level. Also, in this case, the system reception sensitivity within the map area is set to a level that does not detect ground clutter, and this level is also set to a level that does not detect ground clutter.
As long as the images on the CRTs are displayed in the same state, it can also serve as a detection standard when detecting radar targets.

However, there is no problem with manual maps set in this way as long as the manual map setting signals are input correctly, but when manually inputting digital manual map setting signals, input errors are likely to occur. Depending on the details of the input error, a problem arises in that it becomes impossible to detect the radar target.

Therefore, in this embodiment, in addition to the above-mentioned conventional manual map setting function, the manual map setting circuit 54 is provided with a function that can independently perform only the region setting of the manual map, and the above-mentioned problem is solved as follows. We are trying to

That is, the manual map setting circuit 54 outputs the output line 501.
Of the manual map setting signals described above, only the latest information regarding the map area is sent via a preset symbol character.
The data is sent to the instruction device 7 as a map area setting signal and displayed in CI (T) as a temporary area (temporary setting area) in display cell units. is the display area.

When it is determined that the displayed map area is correct based on the display comparison between the map area pattern in the temporary area displayed by the symbol character on the CRT of the indicating device 7 and the ground clutter, the known radar installation conditions, etc. , the output line 50 from the manual map setting circuit 54.
Information regarding the map area and ground clutter is output on output line 603.1 under the control of a map area setting completion signal provided via output line 603. Data processing device 6. and is supplied to the signal detection circuit 51 via the output line 604,
Based on these data, the signal detection circuit 51 changes the detection threshold levels of the direction detection circuit 52 and the short separation detection circuit 53 in the ground clutter occurrence area to the extent that the display of the ground clutter can be masked. . Further, whether the map area symbol character on the display surface of the indicating device 7OCR,T is deleted or left can be arbitrarily determined by the manual map power setting circuit 54 as desired.

If it is determined that the above-mentioned temporary area is incorrectly set, the map area setting signal is corrected and the setting of the temporary area is repeated until one correct map area display is obtained.

Figure 2 is a typical manual map in the embodiment shown in Figure 1.
FIG. 4 is a manual map explanatory diagram for explaining an example.

In Figure 2, P is the image plane of CR and T, and Q is a map area set as a temporary area.If the setting of this map area is determined to be correct, the level of clutter, etc. included in this range will be adjusted. Manual map processing is performed, such as setting corresponding detection criteria.

In the embodiment shown in Fig. 1, the case of ground clutter was explained as an example, but this can be applied to any weather clutter, jamming material such as chaff, manual mapping that targets jamming materials such as chaff, radio waves, etc. It is clear that the same approach can be taken in any case. Further, the manual map setting circuit 54 can perform both temporary area setting and manual map setting as in the past, and which one to use can be arbitrarily selected in consideration of the operational purpose of the radar device, etc. .

It is also clear that the same effect can be achieved even if the receiving device 4 lowers the reception sensitivity in the map area instead of setting the detection threshold by the signal detection circuit 51 during manual map setting.

Furthermore, it is clear that the circuits constituting the signal device 5 shown in FIG. 1 may be configured by combining these circuits in any way.

[Effect of idea]

As explained above, according to the present invention, a signal processing device in a radar device is provided with a manual map setting means that can also set only the area, thereby fundamentally eliminating target detection errors caused by incorrect manual map specification. This has the effect that a processing device can be realized.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing one embodiment of the present invention, and Fig. 2 is an explanatory diagram of a manual map for explaining a typical example of the manual map in the embodiment of Fig. 1.・Antenna, 2... Transmission/reception switch, 3... Transmission device, 4... Receiving device, 5... Signal processing device, 6... Data processing device, 7...Instruction device, 5]...Signal detection circuit, 52...
... Direction detection circuit, 53 ... Distance detection circuit, 5
4...Manual map setting circuit.

Claims (1)

[Claims] A signal processing device for a radar device, characterized by comprising a manual map setting means that allows setting only the area of the manual map in setting the manual map for determining detection criteria for detecting a radar target. signal processing device.