JP2834059B2 - Precision approaching radar display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precision approach radar display device, and more particularly, to a precision approach radar display device for controlling landing guidance of an aircraft.

[0002]

2. Description of the Related Art A landing guidance control system for an aircraft uses a radio wave beam having a wavelength of about 3 cm to measure the distance, azimuth, elevation angle, etc. of an aircraft near an approach path within about 8 NM (Nautical Mile) from a landing point. Approach radar system (Precision Approach Radar;
PAR) is used. Conventionally, as shown in FIG. 5, based on three-dimensional radar information acquired from an aircraft in a landing position, a display device of the precise measurement approach radar device includes:
On the same cathode ray tube surface, an elevation screen EL displaying the relative altitude of the aircraft and an azimuth screen AZ displaying the relative orientation of the aircraft with respect to the runway are displayed together. (Japanese Patent Laid-Open No. 2-10)
285).

As shown in FIG. 1, a glide path cursor GC indicating a height approach road, a range mark RM as a distance scale, and a safety limit cursor SC indicating a safe altitude limit are displayed on the height screen EL. Along with
PAR video TA showing the location of aircraft to be controlled
Is displayed as a bright point on the sweep line SL corresponding to the elevation antenna beam scanning of the precision approaching radar device. On the other hand, the azimuth screen AZ has a course line cursor CC indicating the approach direction of the aircraft, and a range mark R as a distance scale.
M is displayed and the PAR of the aircraft to be controlled
The video TA is displayed as a bright spot on the sweep line SL corresponding to the azimuth direction antenna beam scanning of the precision approaching radar device. Therefore, the sweep line SL of each screen EL, AZ is
Each one is a straight line, but is drawn radially as a whole, and the center point corresponds to the position of the antenna of the precision approaching radar device. The X axis having the origin at each center point indicates the distance from the antenna, and the Y axis indicates the altitude on the high / low screen EL and the relative azimuth based on the runway on the azimuth screen AZ. .

[0004] When such a landing guidance control system is in operation, the reflected radio signal P from the aircraft obtained is acquired.
AR video TA goes up and down approach road (glide path cursor G
C) and a heading approach (course line cursor CC) are enlarged and displayed on the CRT of the display device. The controller looks at the CRT screen and monitors the relative heading of the aircraft and the deviation of the height, and VHF or UHF. While contacting the pilot with the band's radio telephone, the driver is instructed to get on the indicated approach and guides the aircraft to the runway.

[0005]

However, in the above-described conventional precision approaching radar display device, the aircraft PA
Since the R video TA is displayed as a minute bright spot (dot) on one fine sweep line corresponding to the antenna beam scanning of the precision approaching radar device, the PAR video T of the aircraft is displayed.
The visibility of A was not very good, which caused a health problem that tired the controller's eyes, and there was a risk that the position of the aircraft could be lost for a moment and delay the correct instruction to the pilot. there were. Also, the visibility of the screen
However, it is also a problem that individuals differ. That is,
The screen is easy to see for one controller, but very good for another.
Sometimes the screen is difficult. Furthermore, unnecessary tables
Overlapping indications will tire the controller's eyes and should be avoided
It is.

[0006] The present invention has been made in view of the above-mentioned circumstances, and provides a PAR video with good visibility and unnecessary display.
It is an object of the present invention to provide a precision approaching radar display device capable of preventing overlap .

[0007]

According to a first aspect of the present invention, there is provided a video display of an aircraft approaching an airfield based on radar information provided from a precision approaching radar receiver. According to the precision approaching radar display device, video is displayed by bringing a plurality of interpolated sweep lines close to video display on one main sweep line corresponding to input of beam angle data at the time of antenna beam scanning. a video interpolation unit for performing display interpolation, the double
Several interpolation sweep lines use the start point of the main sweep line as the center of rotation.
Displayed within a predetermined minute angle range, and
The starting point of the interpolation sweep line, which is farther from the
It is characterized in that it is set so as to be away from the starting point of the line .

According to a second aspect of the present invention, there is provided the precision approaching radar display apparatus according to the first aspect, wherein a setting means for arbitrarily setting or changing the display angle, the number, and the starting point position of the interpolation sweep lines are provided. It is characterized by being provided.

According to a third aspect of the present invention, there is provided a precision approaching radar display device according to the first or second aspect, wherein the video interpolation processing means includes means for receiving the beam angle data provided from the precision approaching radar receiving device. Display interpolation control means for generating the main sweep line angle data, the interpolation sweep line angle data, the interpolation start point position data and the video control signal based on the input of the radar trigger pulse, and the video signal supplied from the display interpolation control means. A video display for generating video display data on the main sweep line and video display data on each of the interpolated sweep lines based on one sweep of video data provided from the precision approaching radar receiver at the input timing of the control signal. Data creation means.

According to a fourth aspect of the present invention, there is provided a precision approaching radar display apparatus for displaying a video of an aircraft approaching an airfield based on radar information provided from the precision approaching radar receiving apparatus. one for the video display of the main sweep line, the video interpolation processing means for displaying interpolated video by causing accompanied proximate the plurality of interpolated sweep line corresponding to the input of the beam angle data at the time, the Specify the display angle, number, and start point of the interpolation sweep line.
And setting means for setting or changing the setting .

According to a fifth aspect of the present invention, there is provided the precision approaching radar display device according to the fourth aspect, wherein the plurality of interpolated sweep lines have a predetermined minute distance from a starting point of the main sweep line as a rotation center. It is characterized in that it is displayed within an angle range.

[0012]

According to the structure of the present invention, a plurality of (k) interpolated sweep lines accompany each of the normal sweep lines, so that each of the normal sweep lines has a fan-shaped width. Will be displayed. Therefore, since the video of the aircraft to be controlled is displayed over a plurality of sweep lines (a normal sweep line and a plurality of interpolation sweep lines) that apparently constitute a fan-shaped sweep line, the area of the bright spot increases. Thus, a clearer video display with higher density can be obtained. Therefore, the visibility is significantly improved. Addition
In addition, since the display interpolation is not started from the distance ONM,
Unnecessary due to overlapping of multiple sweep lines near ONM
Efficient circuit operation can be realized without drawing update etc.
It does not tire the eyes of the controller. Therefore, there is no
Instructions to the Ilot will be faster and more accurate. In addition,
According to the configuration described in claim 4, the display angle of the interpolation sweep line
Since the number and starting point position can be set or changed arbitrarily,
The display condition can be adjusted to the personal preference of the controller.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. The description will be specifically made using an embodiment. FIG. 1 is a block diagram showing an electrical configuration of a precision approaching radar display device (hereinafter, also simply referred to as a radar display device) according to an embodiment of the present invention, and FIG. 2 is a diagram showing a main interpolation control in the radar display device. FIG. 3 is a block diagram showing an electrical configuration of the video interpolation processing circuit 2 which performs the above-mentioned operations. FIG. 3 is a timing chart showing the interpolation control operation.
FIG. 4 is a schematic diagram schematically showing an example of a PAR video display screen by the radar display device. The radar display device of this example uses a plurality of (k) interpolated sweep lines in close proximity to each regular sweep line (main sweep line) to thereby provide a PAR for an aircraft or the like.
1. An apparatus for performing video display interpolation, comprising an angle data buffer 1 and a video interpolation processing circuit 2 as shown in FIG.
, A range counter 3, a video buffer 4, a scan conversion processing circuit 5, frame memories 6a and 6b, a lookup & D / A converter 7, and a display unit 8.

The angle data buffer 1 is connected to a precision approaching radar receiver (not shown) via a cable, and stores PAR angle data (φ _m , θ _m ) supplied from the precision approaching radar receiver in a predetermined manner. Is output to the video interpolation processing circuit 2 at the timing shown in FIG. Here, φ _m indicates azimuth data of the aircraft in azimuth direction antenna beam scanning, and θ _m
Indicates elevation data of the aircraft in the elevation antenna beam scanning.

The video interpolation processing circuit 2 receives the input PA
On the basis of the R angle data (φ _m , θ _m ), sweeping angle data (φ _m , θ _m + kβ) including interpolation is generated and output to the scan conversion processing circuit 5, and the precision measurement incoming radar is received. At the input timing of the PAR trigger pulse given from the device, a count start signal is generated and output to the range counter 3. The PAR trigger pulse is supplied from the precision approaching radar receiving apparatus to the video interpolation processing circuit 2 at the timing when the precision approaching radar transmitting apparatus emits a radio wave beam from the scanning antenna.

Since the video interpolation processing circuit 2 is a main part of the radar display device of this example, it will be described in more detail with reference to FIGS. Video interpolation processing circuit 2 of this example
Is, as shown in FIG. 2, P
Interpolation number control circuit 21 capable of receiving an AR trigger pulse
And an angle addition circuit 22 to which PAR angle data (φ _m , θ _m ) is supplied from the precision approaching radar receiver via the angle data buffer 1, and a start point position control circuit 23. The interpolation number control circuit 21 repeats a count start signal ((b) in the figure) corresponding to a preset interpolation number (k) starting from the input of the PAR trigger pulse (see FIG. 3 (a)). Occur. The count start signal is supplied to the range counter 3, the angle addition circuit 22, and the start point position control circuit 23 as the start timing of the sweep line including the interpolation. The angle addition circuit 22 outputs the PAR angle data (φ) given from the angle data buffer 1 for each count start signal input from the interpolation number control circuit 21.
_m , θ _m ) and interpolation angle data (kβ) (β is an interpolation angle interval, k is an integer from 0 to the number of interpolations k), and the addition results (φ _m , θ _m ), (φ _m , θ _m + β), (φ _m , θ _m +
2β),..., (Φ _m , θ _m + kβ) are output to the scan conversion processing circuit 5 as sweep line display angle data (FIG. 4D). Here, (φ _m , θ _m ) is P given from the precision approaching radar receiver via the angle data buffer 1.
AR angle data (φ _m , θ _m ), that is, normal sweep line angle data. (Φ _m , θ _m + β) indicates the angle data of the first interpolated sweep line forming a small angle β with the normal sweep line, and (φ _m , θ _m + 2β) similarly indicates the normal (Φ _m , θ _m + kβ) is the angle data of the k-th interpolated sweep line forming the minute angle kβ with the normal sweep line, and the angle data of the second interpolated sweep line forming the minute angle 2β with the sweep line. Are respectively shown.

The start point position control circuit 23 loads the start point position data S ₁ , S ₂ ,..., S _k set in advance for each interpolation sweep line at the timing of a count start signal given from the interpolation number control circuit 21. Is output to the range counter 3. Here, the start point position data indicates the distances S ₁ , S ₂ ,..., S _k from the start point of the normal sweep line corresponding to the antenna position (0 NM) to the start point of the interpolation sweep line. Is set such that the farther away from the normal sweep line, the farther the start point of the interpolation sweep line is from the start point of the normal sweep line (see FIG. 4).

Further, as shown in FIG. 1C, the range counter 3 starts a counting operation by using a count start signal as a trigger, and scans the counter value which is the range data R for sweeping including interpolation by a scan conversion processing circuit. 5 and
The output of the video buffer 4 is controlled by giving the counter value to the video buffer 4. In the range counter 3, starting position data S _1, S ₂ from the start point position control circuit 23, ..., if S _k is given, the start point position data S _1, S _2, ... ..., loads S _k After that, the counting operation is started ((c) in the figure).

The video buffer 4 receives and holds the PAR video data of one sweep (normal sweep line) demodulated and output by the precision approaching radar receiver, and stores the PAR video data for a predetermined number of times according to the control of the range counter 3. Output to the repetition frame memory 6a. That is, the video buffer 4
Each time the range data R to be swept from the range counter 3 is given as a control signal, the PA corresponding to the range data is output.
The R video data is output to the frame memory 6a (FIG. 7E). In this example, since K interpolation sweep lines accompany each normal sweep line in a close state, the same PAR video data is repeatedly written to the frame memory 6a in accordance with "K + 1" times of the description of the sweep lines. Is output.

The scan conversion processing circuit 5 includes sweep angle data (φ _m , θ _m +
kβ) and the range data R for sweeping including interpolation from the range counter 3, and the received R / φ coordinate data and R / θ coordinate data are coordinate-converted into X / Y coordinates to perform raster scan. A scan conversion process for display is performed to generate a write address to the frame memory 6a. The frame memories 6a and 6b are image memories configured so as to correspond one-to-one to the display pixels of the display unit 8 of the bit map system. The PAR video TA is drawn based on the given write address and one sweep of PAR video data given from the video buffer 4. Further, as described in the related art section (see FIG. 5), the frame memory 6b is provided with a glide path cursor (high / low approach path) for the high / low screen EL based on digital graphic data provided from an external storage device (not shown). GC,
Safety limit cursor SC, range mark RM,
And a course line cursor (azimuth approach road) CC and a range mark RM for the azimuth screen AZ are drawn.

The look-up & D / A converter 7 includes PAR video display data for one sweep line read from the frame memory 6a at the TV scanning timing, a glide path cursor GC and the like read from the frame memory 6a at the same TV scanning timing. Course line cursor C
The display data such as C is synthesized, color conversion is performed with reference to a look-up table, and after digital / analog conversion, an analog display signal is output to the display unit 8. The display unit 8 is composed of a raster scan type CRT, and displays a high / low screen EL and an azimuth screen AZ based on an analog display signal given from the look-up & D / A converter 7, and displays each of the screens EL and AZ. PA
The R video is displayed.

Next, the operation of this example will be described. When a PAR trigger pulse is supplied from the fine-measurement approach radar receiving apparatus to the interpolation number control circuit 21 of the video interpolation processing circuit 2, the sweep is started. Interpolation number control circuit 2
Reference numeral 1 indicates that, starting from the input of the PAR trigger pulse (see FIG. 3A), a count start signal (FIG. 3B) corresponding to a preset number of interpolation lines (k) is repeatedly generated. The count start signal is supplied to the range counter 3, the angle addition circuit 22, and the start point position control circuit 23 as the start timing of the sweep line including the interpolation. Angle addition circuit 2
2 is a PA given from the angle data buffer 1 for each count start signal input from the interpolation number control circuit 21.
The interpolation angle data (kβ) is added to the R angle data (φ _m , θ _m ), and the addition results (φ _m , θ _m ), (φ _m , θ _m + β),
(Φ _m , θ _m + 2β),..., (Φ _m , θ _m + kβ) are output to the scan conversion processing circuit 5 as sweep line display angle data (FIG. 4D).

The start point position control circuit 23 loads the start point position data S ₁ , S ₂ ,..., S _k set in advance for each interpolation sweep line at the timing of a count start signal given from the interpolation number control circuit 21. Is output to the range counter 3. Here, the starting point position data is set such that the farther the interpolated sweep line is from the normal sweep line, the farther the start point of the interpolated sweep line is from the start point of the normal sweep line.
The range counter 3 starts a count operation by using a count start signal as a trigger, outputs a counter value which is range data R for sweeping including interpolation to the scan conversion processing circuit 5, and supplies the counter value to the video buffer 4. Thus, the output of the video buffer 4 is controlled ((c) in the figure). In the range counter 3, starting position data S _1, S ₂ from the start point position control circuit 23, ..., if S _k is given, the start point position data S _1, S _2, ... ...,
Load the S _k, load data _{S 1, S 2, ... ...} , starts counting from the number corresponding to S _k (FIG. (C)).

The video buffer 4 receives and holds the PAR video data of one sweep (regular sweep line) demodulated and output by the precision approaching radar receiver, and holds the PAR video data for a predetermined number of times under the control of the range counter 3. Output to the repetition frame memory 6a. In this example, since K interpolation sweep lines are closely associated with one normal sweep line, the same P
The AR video data is repeatedly output to the frame memory 6a in accordance with “K + 1” times of the description of the sweep line. Here, when drawing the interpolation sweep line, the range counter 3 start position data S _1, S _2, ... ..., the count operation is started from the S _k, range data R is also the starting point position data S
₁ , S ₂ ,..., S _k . Therefore, P corresponding to the interval from the start point of the normal sweep line to the start point of the interpolation sweep line is obtained.
The AR video data is not output to the frame memory 6a (see FIG. 4). The scan conversion processing circuit 5 scans the angle data (φ _m ,
θ _m + kβ) and the sweep range data R including interpolation from the range counter 3, and the received R / φ coordinate data and R / θ coordinate data are converted into X / Y coordinates by coordinate conversion. A scan conversion process for performing raster scan display is performed, and a write address to the frame memory 6a is generated.

The frame memory 6a draws a PAR video TA on the basis of a write address given from the scan conversion processing circuit 5 and one sweep of PAR video data given from the video buffer 4. In addition, the frame memory 6b stores the glide path cursor GC for the high / low screen EL, the safety limit cursor SC, the range mark RM, the course line cursor CC for the azimuth screen AZ, and the range based on digital graphic data given from an external storage device. The mark RM is drawn. The look-up & D / A converter 7 transmits the TV data from the frame memory 6a to the TV.
PAR video pixel data for one sweep line read at the scanning timing and TV data from the frame memory 6a.
The image data is combined with graphic pixel data read at the scanning timing, color conversion is performed with reference to a look-up table, digital / analog conversion is performed, and then an analog pixel signal is output to the display unit 8. The display unit 8 displays a high / low screen EL and an azimuth screen AZ based on an analog pixel signal given from the look-up & D / A converter 7.
And a PAR video is displayed.

As described above, according to the above configuration, a plurality of (k) interpolated sweep lines are closely adjacent to each of the normal sweep lines, so that each of the normal sweep lines is shown in FIG. Thus, the display has a fan-shaped width. Therefore, the PAR video TA of the aircraft to be controlled is displayed over a plurality of sweep lines (a normal sweep line and a plurality of interpolated sweep lines) that apparently constitute a fan-shaped sweep line. And a higher density and clearer PAR video display can be obtained. Therefore, the visibility is significantly improved. Also,
It is expected that the instructions to the pilot will be quicker and more accurate without causing the controller's eyes to be tired. Further, as shown in an enlarged manner in FIG. 4, the starting point of the interpolation sweep line is controlled, and the display interpolation is not started from the distance 0 NM.
Efficient circuit operation can be realized without performing unnecessary drawing update or the like due to overlapping of a plurality of sweep lines in the vicinity. In the vicinity of the distance 0 NM, a bright point is generated over a plurality of normal sweep lines that are close to each other, so that a PAR video display with high visibility can be obtained even if the display interpolation is not started from the distance 0 NM.

Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and there are design changes and the like that do not depart from the gist of the present invention. Is also included in the present invention. For example, the number of interpolation sweep lines, the interpolation angle interval, and the starting point position are arbitrary, and the visibility of the screen may vary from person to person. The angle, the number of interpolation lines, and the start point position may be set or changed arbitrarily.

[0028]

As described above, according to the precision approaching radar display apparatus of the present invention, a plurality of (k)
Since the interpolated sweep lines of (1) and (2) are adjacent to each other, each of the normal sweep lines has a display having a fan-shaped width. Therefore, since the video of the aircraft to be controlled is displayed over a plurality of sweep lines (a normal sweep line and a plurality of interpolation sweep lines) that apparently constitute a fan-shaped sweep line, the area of the bright spot increases. Thus, a clearer PAR video display with higher density can be obtained. Therefore, the visibility is significantly improved. Addition
In addition, since the display interpolation is not started from the distance ONM,
Unnecessary due to overlapping of multiple sweep lines near ONM
Efficient circuit operation can be realized without drawing update etc.
It does not tire the eyes of the controller. Therefore, there is no
Instructions to the Ilot will be faster and more accurate. In addition,
According to the configuration described in claim 4, the display angle of the interpolation sweep line
Since the number and starting point position can be set or changed arbitrarily,
The display condition can be adjusted to the personal preference of the controller.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an electrical configuration of a precision approaching radar display device according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating an electrical configuration of a video interpolation processing circuit that performs main interpolation control in the precision measurement approach radar display device.

FIG. 3 is a timing chart showing the interpolation control operation.

FIG. 4 is a schematic diagram schematically showing an example of a PAR video display screen by the precision measurement approach radar display device.

FIG. 5 is a diagram showing an example of a display screen of a conventional precision approaching radar display device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Angle data buffer 2 Video interpolation processing circuit (a part of video interpolation processing means and display interpolation control means) 21 Interpolation number control circuit 22 Angle addition circuit 23 Start point position control circuit 3 Range counter (Video interpolation processing means and display interpolation control means) 4) Video buffer (part of video interpolation processing means, video display data creation means) 5 Scan conversion processing circuit (part of video interpolation processing means, display interpolation control means) 6a, 6b Frame memory (video display data) 7) Lookup & D / A converter 8 Display section EL High / low screen AZ azimuth screen

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-63-19577 (JP, A) JP-A-4-283677 (JP, A) JP-A-3-273184 (JP, A) JP-A-62-1987 245172 (JP, A) JP-A-5-45443 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G01S 7/00-7/42 G01S 13/00-13/95

Claims (5)

(57) [Claims] 1. A precision approach radar display device for displaying a video of an aircraft approaching an airfield based on radar information provided from a precise approach radar receiving device, wherein input of beam angle data during antenna beam scanning. Video interpolation processing means for performing video display interpolation by bringing a plurality of interpolated sweep lines in close proximity to a video display on one main sweep line corresponding to the plurality of interpolated sweep lines. Rotates the starting point of the main sweep line
The starting point of the interpolation sweep line , which is displayed within a predetermined minute angle range with respect to the center and is farther from the main sweep line,
Is set so as to be away from the starting point of the main sweep line . 2. The precision approaching radar display device according to claim 1, further comprising setting means for arbitrarily setting or changing the display angle, the number, and the starting point position of the interpolated sweep lines. 3. The video interpolation processing means, based on the beam angle data and the radar trigger pulse input from the precision approaching radar receiver, receives the main sweep line angle data, the interpolation sweep line angle data, and the interpolation. Start point position
A display interpolation control means for generating the over data and video control signal, at the input timing of the video control signal supplied from the display interpolation control means, based on the video data for one sweep component given from the precision approach radar receiving device 3. The precision approaching radar according to claim 1, further comprising video display data generating means for generating video display data on the main sweep line and video display data on each of the interpolation sweep lines. Display device. 4. A precision approach radar display apparatus for displaying a video of an aircraft approaching an airfield based on radar information provided from the precision approach radar receiving apparatus, wherein beam angle data is input during antenna beam scanning. one for the video display of the main sweep line, the video interpolation processing means for displaying interpolated video by causing accompanied proximate the plurality of interpolated sweep line, the display angle of the interpolation sweep lines corresponding to, Arbitrary number and starting point
A precision approaching radar display device, comprising: setting means for setting or changing the setting . 5. The apparatus according to claim 4, wherein the plurality of interpolated sweep lines are displayed within a predetermined minute angle range around the Air point of the main sweep line as a center of rotation. Precision approaching radar display device.