JP2000075016A - Radar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently track or detect a target by erasing only an echo trail of a designated region, and allowing the trail of the object to be tracked or detected to remain as it is. SOLUTION: A trail erasing area displaying image memory 8 for displaying a set echo trail erasing range is provided. A trail erasing data image memory 9 for storing '0' level data in a set echo trail erasing range and '1' level data except it is provided. An AND gate AG for executing an AND operation of new trail data TDN and data read from the memory 9 during the trail erasing period retaining the new trail data TDN as it is and outputting it as updating trail data TDRN during a period except it, and a switch circuit SW2 are provided. A controller 10 for controlling the respective units is provided and its operating function is added to an operating unit 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a radar device,
In particular, the present invention belongs to a radar apparatus having an echo rail function for displaying a trajectory of an echo over time in a radar image.

[0002]

2. Description of the Related Art When a trajectory of an echo over time is displayed in a radar image, it is easy to determine whether or not the target is a detection target from the trajectory. FIG. 3 shows a block diagram of an example of a conventional radar apparatus having an echo trail function for displaying a trajectory (trail) of such an echo over time. The radar device includes a line buffer memory 1 for storing and transmitting (VDr) polar coordinate type video data VD for one transmission and reception, and a storage area for video data for one screen of a radar image. The video data VDr read from the line buffer memory 1 is sequentially stored in accordance with the input XY address signal ADxy, while the stored video data for one screen of the radar image is stored in an address signal for radar image display ( 3 (not shown in FIG. 3), and an XY coordinate type video of video data VDr read from the line buffer memory 1 based on the video image memory 2 (VDs) and the antenna rotation signal RA. XY address signal for generating and outputting an XY address signal ADxy designating a storage position in the image memory 2 for use. And a storage area for trail data for one screen of a radar image. The trail data TDr stored at the designated address of the input XY address signal ADxy is read out, and the designated address is read. While the stored contents are updated with the update trail data TDRN, the stored trail data for one screen of the radar image is read out according to the radar image display address signal (TDs). The trail image memory 5 and the line buffer memory 1 It is determined whether the value of the level of the video data VDr read out from the memory is larger than a predetermined threshold value Vt4, and if it is larger, the XY address signal ADxy of the trail image memory 5 is determined.
Trail data TDr read from the specified address
(TDr + α) is added to the value of the level (assumed to be the same TDr as the symbol) and output as new trail data TDN, and if not, the predetermined second value trail level control unit 4 that subtracts β (TDr−β) and outputs it as new trail data TDN
When the echo trail function is "ON", the new trail data TDN is used as the update trail data TDRN, and when the "ecourt rail function" is "OFF", the "L" level data is used as the update trail data TDRN.
, The video data VDs read from the video image memory 2, and the trail data TDs read from the trail image memory 5.
Exceeds a predetermined threshold value Vt6, the echo image data EDx including the level information at that time (color information for color display, luminance information for monochrome display)
6x for outputting the image data and the echo image data EDx
And a display device 7 for displaying a radar image based on the information.

In the encoder 6x, both the video data VDs and the trail data TDs
When the time exceeds t6, the video data VDs is displayed on the display 7 with priority. In FIG. 3, RP3 and RP5 of the video image memory 2 and the trail image memory 5 indicate random ports based on an XY address signal ADxy, and SP3 and SP5 indicate serial ports based on an address signal for radar image display. Show.

FIG. 4 is a diagram showing an example of a radar image (monochrome) displayed on the display 7 when the echo rail function is turned "ON" (when the switch circuit SW1 is connected to the "A" side). It is. If the values of α and β in the trail level control section 4 are large and β is small, the trail disappears quickly, and in the opposite case, the trail remains long.
Also, if β = 0, the trail will not disappear,
It continues to be displayed (solid memo display). FIG. 4 also shows actual echoes and trails of the sea clutter CS and the rain clutter CR and trails caused by interference with other radar devices, in addition to the targets. When the echo rail function is set to "OFF" (SW1 is connected to the "B" side), all the trailing image memory 5 stores "L" level data, and the read data also becomes "L" level. And encoder 6
From x, the video data VDs from the video image memory 2
Is output and displayed on the display 7. Therefore, no trail is displayed.

[0005]

In this conventional radar device, when the echo rail function is "ON", even if the video data VDr from the line buffer memory 1 is an echo to be detected or a target echo to be tracked. In addition, even if unnecessary clutter, rain clutter, or interference waves with other radar devices are detected, the trail level control unit 4 similarly controls the level and rewrites (updates) the trail image memory 5 in the trail image memory 5. Since the trail is also displayed on unnecessary echoes other than the target to be detected and tracked, the radar image becomes chaotic, and it becomes impossible to distinguish between the trail of the target and the trail of the unnecessary echo, and the tracking of the target And the detection becomes difficult. In order to display the radar image clearly,
If FF "is set, the trail of the target to be tracked and the target to be detected also disappears, which hinders tracking and detection of the target.

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the prior art, it is an object of the present invention to leave a trail of an echo to be tracked and a detection target, and to erase a trail of a designated area other than the trail, thereby tracking a target. And to provide a radar device capable of performing detection efficiently.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a radar apparatus having an echo rail function for displaying a trajectory of an echo over time in a radar image. It is characterized by having a configuration. (B) A line buffer memory for storing and reading video data for one transmission / reception (b) A storage area for video data for one screen of the radar image is provided, and video data read from the line buffer memory is inputted. While the video data is sequentially stored according to the first address signal, the video data for one screen of the stored radar image is read out according to the second address signal for displaying the radar image. A first address generating unit for generating and outputting the first address signal; and (d) a storage area for trail data for one screen of the radar image, wherein the stored trail data is read in accordance with the first address signal. After that, while updating with the trail data for update, the stored trail data for one screen of radar image is (E) determining whether or not the level of video data read from the line buffer memory is greater than a predetermined threshold value; Adding a predetermined first value to the level value of the trail data read from the trail image memory in accordance with the first address signal and outputting the result as new trail data; A trail level control unit for subtracting a predetermined second value from the level value of the trail data read from the trail image memory in accordance with the first address signal and outputting the result as new trail data; A method for setting an erase range of an echo rail in a radar image and displaying the set erase range in the radar image. Trail erasure range setting / data generation means for generating erasure range display data (g) Erasure range display data from the trail erasure range setting / data generation means having a storage area for erasure range display data for one screen of the radar image A trail erasure range display image memory in which the stored erasure range display data is read out in accordance with the second address signal; and (h) a storage area for one bit data of one screen of the radar image. The "0" level data is stored in all storage areas within the erasure range set by the trail erasure range setting / data generation means, and the "1" level data is stored in all storage areas other than the erasure range. Trail erase data image memory from which stored data is read in accordance with a first address signal, and trail erase data image Data writing means for writing the "0" level data and the "1" level data into the memory (i) new trail data from the trail level control unit and the image memory for the trail erase data during a predetermined trail erase period AND processing control means for performing an AND process with the data read from the memory and outputting the same as the update trail data, and outputting the new trail data as it is as the update trail data during periods other than the trail erasing period. A control unit for controlling the operation of the trail erase range setting / data generating means, the operation control of the trail erase data image memory and the data writing means, and the operation control of the AND processing control means; Read out according to
A display for displaying the radar image based on the video data from the video image memory, the trail data from the trail image memory, and the erasure range display data from the trail erasure range display image memory

Further, the control unit sets the trail erasure range setting / data generation means to set an erasure range of an echo rail in a radar image, generate the erasure range display data, and simultaneously store the erasure range display data. After generating an address and controlling the output to the trail erasure range display image memory, and controlling the trail erasure data image memory to a write state, a data writing unit to the trail erasure data image memory includes: The address of all storage areas within the erasure range set by the trail erasure range setting / data generation means is "0" level data, and the address of all storage areas other than the set erasure range is "1" level data. Control to generate and output such data and address signals to the trail erase data image memory. The trail erase data image memory is controlled so as to be in a read state according to the first address signal after the writing of the "0" level data and the "1" level data is completed. After the writing of the “0” level data and the “1” level data is completed, the trail erasing period is set and the A
Controlling the ND processing control means to perform processing within the trail erasing period; and setting the trail erasing period set by the control unit based on the antenna rotation signal,
It is configured as a period during which the antenna makes one rotation.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention relates to a conventional radar apparatus, which includes a trail erase range setting / data generating means, a trail erase range display image memory, a trail erase data image memory, and a trail erase data. Means for writing data to the image memory for data, AND processing control means,
A control unit for controlling these operations is newly provided, and the display unit has video data from the video image memory, trail data from the trail image memory, and erasure from the trail erasure range display image memory. The radar image based on the range display data is displayed, and the following newly provided and changed means configuration operates as follows. First, the trail erasure range setting / data generating means sets the erasure range of the echo rail in the radar image, and outputs erasure range display data for displaying the erasure range in the radar image. The trail erasure range display image memory stores the above erasure range display data, and reads out the stored erasure range display data according to the second address signal for radar image display.

[0010] By means of data writing to the trail erase data image memory, "0" level data is stored in the trail erase data image memory in all storage areas within the above erase range, and all data except the erase range is stored. "1" in the area
After storing the level data, the data stored in the trail erase data image memory is read according to the first address signal generated based on the antenna rotation signal.

Then, during a predetermined trail erasing period, the AND processing control means performs an AND process on the new trail data from the trail level control unit and the data from the trail erase data image memory to update the data for updating. Is input to the trail image memory. As a result, "0" level data is written in the above-mentioned erasure range of the trail image memory, and the "0" level data read from the trail image memory in accordance with the second address signal causes the data in the radar image to be read. The echo rail in the above range is erased. Accordingly, since only the erased erase rail can be erased, and the trail of the echo to be tracked and detected can be left, the tracking and detection of the target can be performed efficiently.

[0012]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of the present invention. This embodiment is different from the conventional radar device shown in FIG. 3 in that a new radar device is added to the conventional radar device.
Trail erase area display image memory 8, trail erase data image memory 9, controller 10, AND gate A
G, and switch circuits SW2 and SW3 are provided.
1 has a function of generating an erasing range setting signal EAS, an erasing data writing signal EAW, and a trail erasing signal EAE, and the encoder 6 reads out the serial port SP8 of the trail erasing area display image memory 8 from the serial port SP8. The function of additionally controlling the data and outputting the data to the display unit 7 is added. The details of these units are as follows.

The control unit 10 and the operation unit 11 include the operation unit 1
The erasure range of the echo rail in the radar image is set by the track ball (the output signal TB thereof) provided in the unit 1, and the erasure range setting signal EAS is set to the “0” level. And a trail erasure range setting / data generating means for generating an erasure range display data EADr for displaying the data therein and an address signal ADr8 for designating a write address of the erasure range display data EADr. The trail erase area display image memory 8 stores the erase area display data EA for one radar image.
An area for storing Dr is provided to store the erasure range display data EADr from the control unit 10, while the stored data is stored in the serial port SP8 according to an address signal (second address signal, not shown) for displaying a radar image. (EADs). The trail erase data image memory 9 has an area for storing 1-bit data for one screen of a radar image, and the control circuit 10 sets the switch circuit SW3 to the B side so that the trail erase data T
In accordance with the EW and the address signal ADr9, "0" level data is stored in all storage areas within the erasure range set by the trail erasure range setting / data generation means, and "0" level data is stored in all storage areas other than the set erasure range. After storing the 1 "level data, the control unit 10 controls the switch circuit SW3
Is connected to the A side, and stored data is read out according to the XY address signal ADxy (TER).

When the erase data write signal EAW from the operation unit 11 becomes "ON" by the control unit 10, the operation unit 11, and the switch circuit SW3, the switch circuit SW
3 is connected to the B side so that trail erase data TEW of “0” level data, “1” level data and address signal A
Data writing means for generating Dr 9 and writing it to the trail erase data image memory 9 is configured. The control unit 10
When the data writing to the trail erase data image memory 9 is completed and the trail erase signal EAE from the operation unit 11 goes to the “ON” level, a trail erase period is set, and during this trail erase period, the switch circuit SW2 is switched to the B side. To transmit the trail erasure data TER read from the trail erasure data image memory 9 to the AND gate AG.
The ER and the new trail data TDN from the trail level control unit 4 are AND-processed and supplied to the trail image memory 5 as the updated trail data TDRN.
During periods other than the trail erasing period, the switch circuit SW2
To the A side to transmit "H" level ("1" level) data to the AND gate AG,
Supplies the new trail data TDN as it is to the trail image memory 5 as the updated trail data TDRN. The encoder 6 adds the erasure range display data EADs read from the serial port SP8 of the trail erasure area display image memory 8 to the processing result for the video data VDs and the trail data TDs, and supplies the display result to the display 7.

As a result, the erasure range setting signal EAS is first set to the "ON" level to set the erasure range with a trackball or the like in the radar image of the display device 7 as shown in FIG.
As shown in (b), the trail erasure range frame EAF is displayed. When the erasure range is determined, the erasure data write signal EAW is set to the “ON” level, and “0” is set in the erasure range of the trail erasure data image memory 9. After writing the data, the trail erase signal EAE is set to the “ON” level, thereby erasing the coat rail (sea clutter SC including the trail) in the trail erase range frame EAF as shown in FIG. 2C. And the actual echo E of the target outside the erasure range
t and its trail TRt are displayed as they are. In other words, while leaving the echo of the target to be tracked and the trail of the echo to be detected, it is possible to erase only the echo trail in the other specified area, so that tracking of the target and detection of a new target can be performed. It can be performed efficiently.

The control unit 10 starts the trail erasing period as soon as the trail erasing signal EAE from the operation unit 11 goes to the “ON” level, and simultaneously performs one rotation of the antenna based on the antenna rotation signal RA. When the detection is made and the antenna makes one rotation, the trail erasing period ends. During the trail erasing period, the echo trail is not displayed in the trail erasing range frame EAF, so that if the trail erasing period is long, it is difficult to grasp the continuity of the echo,
The detection capability of the target within the range is reduced, but by setting the trail erasing period in this way, the erasing period of all the echo rails in the trail erasing range frame EAF and the period in which the echo rail is not displayed can be minimized. The control unit 10 can be easily configured by a microcomputer or the like.

[0017]

As described above, according to the present invention, a range in which an erase rail is desired to be erased is set and only the erase rail within this range is erased, so that only unnecessary echo rails are erased. This makes it possible to clear the radar image and leave necessary echo rails, so that tracking of a target and detection of a new target can be easily performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a diagram showing a radar image before the operation of an echo rail erasing function, at the time of setting an echo rail erasing range, and at the time of erasing an echo rail, for explaining the operation and effect of the embodiment shown in FIG. 1;

FIG. 3 is a block diagram illustrating an example of a conventional radar device.

FIG. 4 is a diagram showing a radar image for explaining an echo rail function of the radar device shown in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Line buffer memory 2 Video image memory 3 XY address generation part 4 Trail level control part 5 Trail image memory 6, 6x encoder 7 Display 8 Trail erase area display image memory 9 Trail erase data image memory 10 Control Unit 11 Operation unit AG AND gate SW1 to SW3 Switch circuit

Claims (3)

[Claims] 1. A radar apparatus having an echo rail function for displaying a trajectory of an echo over time in a radar image, the radar apparatus having the following components. (B) A line buffer memory for storing and reading video data for one transmission / reception (b) A storage area for video data for one screen of the radar image is provided, and video data read from the line buffer memory is inputted. While the video data is sequentially stored according to the first address signal, the video data for one screen of the stored radar image is read out according to the second address signal for displaying the radar image. A first address generating unit for generating and outputting the first address signal; and (d) a storage area for trail data for one screen of the radar image, wherein the stored trail data is read in accordance with the first address signal. After that, while updating with the trail data for update, the stored trail data for one screen of radar image is (E) determining whether or not the level of video data read from the line buffer memory is greater than a predetermined threshold value; Adding a predetermined first value to the level value of the trail data read from the trail image memory in accordance with the first address signal and outputting the result as new trail data; A trail level control unit for subtracting a predetermined second value from the level value of the trail data read from the trail image memory in accordance with the first address signal and outputting the result as new trail data; A method for setting an erase range of an echo rail in a radar image and displaying the set erase range in the radar image. Trail erasure range setting / data generation means for generating erasure range display data (g) Erasure range display data from the trail erasure range setting / data generation means having a storage area for erasure range display data for one screen of the radar image A trail erasure range display image memory in which the stored erasure range display data is read out in accordance with the second address signal; and (h) a storage area for one bit data of one screen of the radar image. The "0" level data is stored in all storage areas within the erasure range set by the trail erasure range setting / data generation means, and the "1" level data is stored in all storage areas other than the erasure range. Trail erase data image memory from which stored data is read in accordance with a first address signal, and trail erase data image Data writing means for writing the "0" level data and the "1" level data into the memory (i) new trail data from the trail level control unit and the image memory for the trail erase data during a predetermined trail erase period AND processing control means for performing an AND process with the data read from the memory and outputting the same as the update trail data, and outputting the new trail data as it is as the update trail data during periods other than the trail erasing period. A control unit for controlling the operation of the trail erase range setting / data generating means, the operation control of the trail erase data image memory and the data writing means, and the operation control of the AND processing control means; Read out according to
A display for displaying the radar image based on video data from the video image memory, trail data from the trail image memory, and erasure range display data from the trail erasure range display image memory 2. The controller according to claim 1, wherein said trail erasure range setting / data generating means sets an erasure range of an echo trail in a radar image, generates erasure range display data, and stores the erasure range display data. After generating an address and controlling the output to the trail erasure range display image memory, and controlling the trail erasure data image memory to a write state, a data writing unit to the trail erasure data image memory includes: "0" level data is used for addresses of all storage areas within the erase range set by the trail erase range setting / data generation means, and "1" is used for addresses of all storage areas other than the set erase range.
A data and an address signal which become level data are generated and controlled so as to be output to the trail erase data image memory, and the trail erase data image memory is stored as "0" level data and "1" level data. After the writing is completed, control is performed so as to be in a reading state according to the first address signal, and the trail erasing period is set after the writing of “0” level data and “1” level data to the trail erasing data image memory is completed. And said AND
2. The radar device according to claim 1, wherein the processing control means controls the processing to be performed within the trail erasing period. 3. The radar device according to claim 2, wherein the trail erasure period set by the control unit is a period during which the antenna makes one rotation based on the antenna rotation signal.