JP3380509B2 - Radar equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radar device, and more particularly to an inverse synthetic aperture radar device which is a high resolution radar.

[0002]

2. Description of the Related Art ISAR, which is a conventional high resolution radar
(Inverse Synthetic Aperture
The operation of e Radar (Inverse Synthetic Aperture Radar) will be described with reference to the accompanying drawings. FIG. 25 is a basic configuration diagram of a conventional ISAR. In FIG. 25, 4 is a receiver that generates a transmission type signal, 1 is a transmitter that amplifies the output of the receiver 4 and generates a transmission signal, and 2 is a transmitter. It is a circulator that supplies the output of 1 to the antenna 3 and supplies the reception signal from the antenna 3 to the receiver 4.

Reference numeral 5 is a signal processor for processing the radar video output from the receiver 4. The signal processor 5 is an ISAR processing section 5c for performing high resolution processing (ISAR processing) based on the output of the receiver 4. Tracking processing unit 5 for tracking a target
b, a beam control unit 5a for calculating the antenna beam azimuth,
The display processing unit 5d is configured to process display data.

Reference numeral 6 denotes an operation display for displaying a target high resolution image based on the output of the signal processor 5 by an operator's operation. Reference numeral 7 denotes antenna control for controlling the antenna beam azimuth according to an angle signal output from the signal processor 5. It is a vessel.

Next, the operation of the conventional ISAR will be described. The transmitter 1 amplifies the transmission seed signal generated by the receiver 4 to generate a high frequency signal (RF signal). The RF signal is radiated from the antenna 3 to the free space via the circulator 2. Then, the radiated signal is reflected by a target (not shown). The reflection echo from the target received by the antenna 3 is input to the receiver 4 via the circulator 2.

The reflection echo is pulse-compressed in the receiver 4 in order to improve the resolution in the range direction (distance direction from the antenna 3) and then becomes an A / D converted digital radar video. The radar video is quantized and stored in range cells divided according to the distance from the radar. On the other hand, ISAR achieves high resolution in the cross-range direction (direction orthogonal to the range direction) by performing synthesis on the aperture plane.

Due to the high resolution in the cross range direction due to the ISAR processing and the high resolution in the range direction due to the above-described pulse compression, the ISAR processing section 5c.
At, the target image signal is generated. The display processing unit 5d converts the image signal into a display signal and outputs the display signal to the operation display unit 6 and
As shown in 6, the target is displayed as an image. The tracking processing unit 5b detects a target from the radar video, performs a tracking calculation process using a tracking filter, and calculates the AZ and EL directions of the target.

The beam control unit 5a generates a beam control signal from a target azimuth consisting of AZ (azimuth direction) and EL (elevation angle direction) calculated by the tracking processing unit 5b and an angle signal from the antenna controller 7 to generate an antenna. Output to the controller 7.
The antenna controller 7 sends a drive signal to the antenna 3 according to the control signal, and drives the antenna 3 toward the target direction.

Next, the positional relationship between the target and the radar and the form of the image will be described. As shown in FIG. 27, the start-time distance Ro synthetic aperture to synthetic aperture end R _E, if the ship target approaches the radar, radar near (near)
The range is the bow and the far range is the stern.

Then, the range profile image shown in FIG. 28B and the ISAR image shown in FIG. 28A are generated and displayed on the operation display unit 6 shown in the basic configuration diagram of the radar shown in FIG.

Here, in the two-dimensional display of the range profile, the range information of the radar reception signal is displayed horizontally and the intensity information is displayed vertically. In the two-dimensional display of the ISAR image, the range information after the ISAR processing is displayed in the horizontal direction and the Doppler information is displayed in the vertical direction. The optical image corresponding to the display form of the range profile and the ISAR image (in the bow and stern direction) is shown in FIG.
This is as shown in (c).

Here, the contents of the ISAR processing will be described with reference to FIG. The ISAR processing unit 5c tracks the target of the radar video data based on the distance / amplitude information of the data on the time axis, and calculates the movement amount in the range cell unit for each pulse hit as the distance compensation amount. Based on the distance compensation amount, the radar video is distance-compensated in units of range cells for the distance shift due to the movement of the target. As a result, the target can be treated as if it were stationary.

Next, autofocus is performed on the frequency axis based on the time / frequency information, and the target Doppler frequency and Doppler frequency are integrated from the tracking speed to calculate the phase amount as the phase compensation amount. With the phase compensation amount, the radar video data is compensated by complex multiplication of the Doppler shift due to the movement of the target. FF for radar video data after the compensation
T (Fast Fourier Transform) is performed to move the target (roll,
Discriminate pitch and yaw frequency components. Then, the amplitude of the signal is detected, and the image signal is generated and output.

The image processing unit 5d converts / outputs the image signal into a display signal which matches the resolution of the operation display unit 6, the display brightness dynamic range, the operation information, etc., and the operation display unit 6 displays the image signal as shown in FIG. For the ISAR image, the range information is displayed in the horizontal direction, the Doppler information is displayed in the vertical direction, and the reflection intensity is displayed as the brightness.

Further, the antenna controller 7 generates an antenna drive signal from the beam control signal from the signal processor 5 and the angle signal from the antenna to control the antenna.
The above is the operation of the conventional radar device / ISAR.

[0016]

The conventional radar device is configured as described above, and since the ISAR image is displayed singly on the operation display unit, only the information of range, Doppler, and reflection intensity can be expressed. However, there is a problem that the identification accuracy is small in comparison with the target identification by imaging the target which is the original purpose of ISAR.

The present invention has been made to solve the above problems, and an object thereof is to obtain a radar device capable of improving the identification accuracy.

[0018]

According to the present invention, there is provided a transmitter for generating a transmission signal, an antenna for radiating the transmission signal and receiving a reflection signal (also referred to as a reception signal) from a target, and the reflection signal for the reflection signal. A receiver that receives and processes a video signal, a signal processor that performs synthetic aperture processing on the video signal to generate an ISAR image signal and an image signal of a range profile, and these image signals are displayed on the same screen. And a display processing unit that generates a display signal to be displayed.

The display processing unit according to the present invention is for generating a display signal for displaying an image in which the ISAR image and the actual length of the range profile are aligned and the images vertically arranged in parallel are displayed.

The display processing unit of the present invention generates a display signal for displaying an image in which the ISAR image and the actual length of the range profile are superposed together.

According to the present invention, a transmitter for generating a transmission signal, an antenna for radiating the transmission signal and receiving a reflected signal (also referred to as a received signal) from a target, and a video signal for receiving and processing the reflected signal. A receiver that produces
A signal processor for performing synthetic aperture processing on the video signal to generate an ISAR image signal and an image signal of a range profile, and at least one or more characteristics of the target are CFA.
The image processing apparatus is provided with a feature detecting section that detects the characteristic information by the R process and outputs the characteristic information, and a display processing section that generates a display signal for displaying the respective image signals and the characteristic information on the same screen.

The feature detection unit of the present invention outputs at least one of the bow, stern, and mast detected by the Doppler process by the CFAR process to the target ship as the feature information by the vertical cursor.

The display processing unit according to the present invention superimposes the bow detected by the CFAR processing on the images arranged in parallel in the vertical direction in which the actual lengths of the ISAR image and the range profile are combined, in the display by the vertical cursor. A display signal for displaying an image is generated.

The display processing unit according to the present invention displays an image in which the bow detected by the CFAR processing is superimposed on the superimposed image in which the actual length of the ISAR image and the range profile are superimposed by the display by the vertical cursor. A display signal is generated.

The display processing unit according to the present invention superimposes the stern detected by the CFAR processing on the image arranged in parallel vertically with the actual lengths of the ISAR image and the range profile being displayed by a vertical cursor. A display signal for displaying an image is generated.

The display processing unit of the present invention displays an image in which the stern detected by the CFAR processing is superimposed on the superimposed image in which the actual length of the ISAR image and the range profile are combined by the display by the vertical cursor. A display signal is generated.

The display processing unit according to the present invention superimposes the bow and stern detected by the CFAR processing on the images arranged in parallel at the top and bottom of the actual lengths of the ISAR image and the range profile in a display by the vertical cursor. A display signal for displaying the selected image is generated.

The display processing unit of the present invention displays an image in which the bow and stern detected by the CFAR processing are superimposed on the superimposed image in which the actual length of the range profile and the actual length of the range profile are superimposed by the display by the vertical cursor. A display signal to be displayed is generated.

The display processing unit according to the present invention superimposes the mast detected by the Doppler processing on the image arranged in parallel vertically with the actual lengths of the ISAR image and the range profile combined, in the display by the vertical cursor. A display signal for displaying an image is generated.

The display processing unit of the present invention displays an image in which the mast detected by the Doppler processing is superimposed on the superimposed image in which the ISAR image and the actual length of the range profile are combined by the vertical cursor display. A display signal is generated.

The display processing unit according to the present invention includes the masts detected by the bow, stern and Doppler processing detected by the CFAR processing in the images arranged in parallel vertically with the actual lengths of the ISAR image and the range profile combined. ,
A display signal for displaying an image superimposed by the display by the vertical cursor is generated.

The display processing unit according to the present invention uses the vertical cursor to detect the mast detected by the CFAR processing, the stern, and the mast detected by the Doppler processing on the superimposed image in which the actual lengths of the ISAR image and the range profile are combined. A display signal for displaying an image superimposed on the display is generated.

[0033]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. A radar device (ISAR) according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a diagram showing a basic configuration of the radar device according to the first embodiment. In the figure, 4 is a receiver for generating a transmission seed signal, 1 is a transmitter for amplifying the output of the receiver 4 to generate a transmission signal, and 2 is for supplying the output of the transmitter 1 to the antenna 3 and the antenna 3 It is a circulator that supplies a reception signal to the receiver 4.

Reference numeral 5A is a signal processor according to the present embodiment, and this signal processor 5A carries out high resolution processing (ISAR processing) based on the output of the receiver 4, ISAR processing section 5c,
It is composed of a tracking processing unit 5b for tracking a target, a beam control unit 5a for calculating an antenna beam azimuth, and a display processing unit 5d for processing display data.

Reference numeral 6 is an operation display for displaying a target high resolution image based on the output of the signal processor 5A under the operation of an operator, and reference numeral 7 is an antenna beam azimuth control by an angle signal output from the signal processor 5A. It is an antenna controller.

Next, the operation of this embodiment will be described. The transmitter 1 signal generated in the receiver 4 is amplified in the transmitter 1 to generate a high frequency signal (RF signal). The RF signal is radiated from the antenna 3 to the free space via the circulator 2. Then, the radiated signal is reflected by a target (not shown). The reflected echo from the target received by the antenna 3 is input to the receiver 4 via the circulator 2.

The reflected echo is pulse-compressed in the receiver 4 in order to improve the resolution in the range direction (distance direction from the antenna 3) and then becomes a digital radar video which is A / D converted. The radar video is quantized and stored in range cells divided according to the distance from the radar.

On the other hand, ISAR achieves high resolution in the cross-range direction (direction orthogonal to the range direction) by synthesizing aperture surfaces. Due to the higher resolution in the cross range direction due to this ISAR processing and the higher resolution in the range direction due to the aforementioned pulse compression, the range profile (see FIG. 28B) and the ISAR image (see FIG. 28B) are displayed in the display processing unit 5c of the ISAR. FIG. 28 (a)
Two image signals are generated for the target and the target. The display processing unit 5d converts these two image signals into display signals and outputs them to the operation display unit 6.

The tracking processing section 5b detects a target from the radar video and performs a tracking calculation process using a tracking filter to calculate the AZ and EL directions of the target. The beam control unit 5a generates a beam control signal from the target directions of AZ and EL calculated by the tracking processing unit 5b and the angle signal from the antenna controller 7.

Next, the positional relationship between the target and the radar and the form of the image will be described. As shown in FIG. 27, the start-time distance Ro synthetic aperture to synthetic aperture end R _E, if the ship target approaches the radar becomes radar near range bow, _far range and stern, Fig 28 (b ), And an ISAR as shown in FIG.
An image is generated and displayed on the operation display unit 6 shown in the basic configuration diagram of the radar.

Here, in the two-dimensional display of the range profile, the range information of the radar reception signal is displayed in the horizontal direction and the intensity information is displayed in the vertical direction. In the two-dimensional display of the ISAR image, the range information after the ISAR processing is displayed in the horizontal direction and the Doppler information is displayed in the vertical direction. The optical image corresponding to the display form of the range profile and the ISAR image (in the bow and stern direction) is shown in FIG.
It is as shown in (c).

Here, the contents of the ISAR processing will be described with reference to FIG. The ISAR processing unit 5c tracks the target of the radar video data based on the distance / amplitude information of the data on the time axis, and calculates the movement amount in the range cell unit for each pulse hit as the distance compensation amount. Based on the distance compensation amount, the radar video is distance-compensated in units of range cells for the distance shift due to the movement of the target. As a result, the target can be treated as if it were stationary.

Next, autofocus is performed on the frequency axis from the time / frequency information, and the target Doppler frequency and the Doppler frequency are integrated from the tracking speed to calculate the phase amount as the phase compensation amount. With the phase compensation amount, the radar video data is compensated by complex multiplication of the Doppler shift due to the movement of the target. FF for radar video data after the compensation
T is performed to discriminate target fluctuation (roll, pitch, yaw frequency) components. Then, the amplitude of the signal is detected and I
Generates and outputs a SAR image signal.

Further, the image signal of the range profile is generated by integrating the amplitude values in the same range direction for the synthetic aperture time. Then, the amplitude of the signal is detected, and the ISRA image signal is generated and output. Further, the image signal of the range profile is generated by integrating the amplitude values in the same range direction for one synthetic aperture time.

In the display processing section 5d, the actual lengths of both the image signals of the ISAR image and the range profile are matched, and both images are arranged so as to be displayed in parallel vertically, and the resolution of the operation display section 6 and the display brightness dynamic range are set. , The display signal corresponding to the operation information is converted and output, and in the operation display unit 6, the ISAR image is arranged on the upper side and the range profile is arranged on the lower side as shown in FIG. , The Doppler information is displayed in the vertical direction, and the reflection intensity is displayed in the luminance.

By displaying both images with the ISAR image on the upper side and the range profile on the lower side, the relationship between the reflection intensity distribution in the range direction and the Doppler frequency becomes clear.

Further, the antenna controller 7 generates an antenna drive signal from the beam control signal from the signal processor 5 and the angle signal from the antenna 3 to control the antenna 3. The above is the operation of the radar device / lSAR of the first embodiment.

Embodiment 2. In the first embodiment described above, the ISAR image and the range profile are displayed in parallel vertically with the actual lengths matched, but in the present embodiment, the signal processing shown in the basic configuration diagram of the radar device shown in FIG. 3 is performed. In the display processing unit 5d in the device 5B, the vertical position is adjusted by matching the actual lengths of both the ISAR image and the range profile image signal, and a display signal for displaying an image in which both images are superimposed is displayed. To generate.

The operation display unit 6 displays an image in which the ISAR image and the range profile are superimposed as shown in FIG. 4 according to the display signal. As a result, the relationship between the reflection intensity distribution in the range direction and the Doppler frequency becomes clear as in the first embodiment.

Embodiment 3. In the first embodiment, the ISAR image and the range profile are displayed in parallel vertically with the actual lengths matched, but the present embodiment shows the signal processor shown in the basic configuration diagram of the radar device shown in FIG. In the feature detection unit 5e in 5c, the bow is detected by CFAR processing (GOCFAR for detecting edges), and the position of the bow is output as feature information.

In the display processing unit 5d, the actual length of the range profile is adjusted to the position of the bow of the ISAR image output from the ISAR processing unit 5c so that the IAR image can be displayed vertically in parallel and in parallel. I displayed
CFA for both SAR image and range profile image
A display signal of an image in which the bow detected by the R processing is arranged by the bow cursor is generated.

The operation display 6 displays the ISAR image and the range profile in parallel vertically as shown in FIG. 6 according to the display signal, and displays an image in which the bow cursor is superimposed on both of these images. As a result, similarly to the second embodiment, the relationship between the reflection intensity distribution in the range direction and the Doppler frequency and the feature in the length direction from the bow become clear.

Fourth Embodiment In the first embodiment described above, the ISAR image and the range profile are displayed in parallel vertically with the actual lengths matched, but in the present embodiment, FIG.
Signal processor 5D in the basic configuration diagram of the radar device shown in FIG.
In the inside characteristic detection unit 5e, the bow is detected by CFAR processing (GOCFAR for detecting edges), and the position of the bow is output as characteristic information.

The display unit 5d adjusts the vertical position by matching the actual length of the range profile and the position of the bow to the ISAR image signal output from the ISAR processing unit 5c. Further, a bow signal is superimposed on the image obtained by superimposing the ISAR image and the range profile image to generate a display signal for displaying the image.

The operation display unit 6 superimposes both the ISAR image and the range profile image as shown in FIG. 8 on the basis of the display signal, and displays the image in which the bow cursor is superposed on the both images. As a result, similarly to the second embodiment, the relationship between the reflection intensity distribution in the range direction and the Doppler frequency and the feature in the length direction from the bow become clear.

Embodiment 5. In the first embodiment, the ISAR image and the range profile are displayed in parallel vertically with the actual lengths being matched. However, in the present embodiment, the signal processor in the basic configuration diagram of the radar device shown in FIG. 9 is used. The feature detecting unit 5e in 5E detects the stern by the CFAR process (GOCFAR for detecting an edge) and outputs the position of the stern as feature information.

The display processing unit 5d displays the ISAR image and the actual length of the range profile, and the positions of the stern on the respective images so that these images are displayed vertically in parallel and both images are displayed in parallel. The stern force generator generates a display signal for displaying the displayed image.

The operation display unit 6 displays the ISAR image and the range profile image in parallel in the vertical direction as shown in FIG. 10 according to the display signal, and displays the image in which the stern curser is superimposed on the both images. As a result, similarly to the third embodiment, the relationship between the reflection intensity distribution in the range direction and the Doppler frequency and the characteristic in the length direction from the stern become clear.

Sixth Embodiment In the first embodiment, the ISAR image and the range profile are displayed in parallel vertically with the actual lengths matched, but the feature detection unit in the signal processor 5F in the basic configuration diagram of the radar device shown in FIG. 5
e is CFAR processing (GOCFAR for detecting edges)
The stern is detected and the position of the stern is output as feature information.

In the display processing unit 5d, the actual lengths of the ISAR image and the image signals of the range profile are adjusted to adjust the position in the vertical direction, and the stern position is adjusted to I and I.
On the image in which the SAR image and the range profile are superimposed,
A display signal for displaying an image on which the stern cursor is superimposed is generated.

The operation display 6 displays both the ISAR image and the range profile image as shown in FIG. 12 in a superimposed manner by the display signal, and displays the image in which the stern cursor is superimposed on both of these images. As a result, similar to the fourth embodiment, the relationship between the reflection intensity distribution in the range direction and the Doppler frequency and the characteristic in the length direction from the stern become clear.

Embodiment 7. In the first embodiment described above, the ISAR image and the range profile are displayed in parallel vertically with the actual lengths matched, but the feature detection unit in the signal processor 5G in the basic configuration diagram of the radar device shown in FIG. 5
e, CFAR processing (GOCF for detecting edges)
AR) detects the bow and stern, and outputs the positions of the bow and stern as characteristic information.

The display processor 5d matches the actual lengths of both the ISAR image and the range profile image, and
By aligning the positions of the bow and stern with both images, ISAR
A display signal is generated in which both the image and the range profile image are displayed vertically in parallel, and an image in which the bow force and the stern curser are arranged is displayed in the both images.

As shown in FIG. 14, both the ISAR image and the range profile image are displayed in parallel vertically on the operation display 6 as shown in FIG. 14, and the bow and stern cursers are superimposed on these images. Display an image. As a result, similarly to the third and fifth embodiments, the relationship between the reflection intensity distribution in the range direction and the Doppler frequency, the characteristic in the length direction from the bow, and the characteristic in the length direction from the stern become clear.

Embodiment 8. In the first embodiment described above, the ISAR image and the range profile are displayed in parallel vertically with the actual lengths matched, but the features of the signal processor 5H that can be included in the basic configuration diagram of the radar device shown in FIG. In the detection unit 5e, CFAR processing (GOC for detecting an edge)
The bow and stern are detected by FAR), and the positions of the bow and stern are output to the display processing unit 5d as characteristic information.

In the display processing unit 5d, the actual lengths of both image signals are adjusted on the basis of the characteristic information to adjust the position in the vertical direction, and the positions of the bow and stern of the images are adjusted to match the IS.
A display signal for displaying an image in which both the AR image and the range profile image and the bow and stern cursers are superimposed is generated.

In response to the display signal, the operation display unit 6 displays an image in which the bow and the stern cursor are superimposed on the superimposed image of the ISAR image and the range profile as shown in FIG. As a result, as in the fourth and sixth embodiments, the relationship between the reflection intensity distribution in the range direction and the Doppler frequency, the characteristic in the length direction from the bow, and the characteristic in the length direction from the stern become clear.

Ninth Embodiment In the first embodiment, the ISAR image and the range profile are displayed in parallel vertically with the actual lengths matched, but in the present embodiment, FIG.
Signal processor 5I in the basic configuration diagram of the radar device shown in FIG.
In the inside characteristic detection unit 5e, the position where the Doppler frequency in the ISAR image signal is the maximum is detected, and the position of the mast is output as the characteristic information (it is assumed that the structure has the highest mast in the ship target. Since the Doppler frequency is proportional to the radius of gyration according to the principle of ISAR, the Doppler frequency of the mast having the largest (highest) radius of gyration is maximized.

In the display processing unit 5d, the actual lengths of the ISAR image and the range profile are matched, and the positions of the masts are matched to the both images, so that both the ISAR image and the range profile are displayed vertically in parallel. And a display signal for displaying an image in which the mast curser is superposed on both images. As a result, on the operation display 6, as shown in FIG.
Features in the bow and stern direction from the AR image, range profile and mast become clear.

Tenth Embodiment In addition, the first embodiment
In this case, the ISAR image and the range profile are displayed in parallel vertically with the actual lengths being matched.
The signal processor 5 in the basic configuration diagram of the radar device shown in FIG.
The feature detection unit 5e in J detects the position of the maximum Doppler frequency in the ISAR image signal and outputs the position of the mast as feature information.

The display processing unit 5d adjusts the position in the vertical direction by adjusting the actual lengths of the image signals of the ISAR image and the range profile, and adjusts the position of the mast to these images to adjust the ISAR image and the range profile. And a display signal for displaying an image in which a mast curser is superimposed on both images.

As shown in FIG. 20, the operation display 6 is an IS display.
An image in which the mast curser is superimposed on the superimposed image of the AR image and the range profile is displayed. As a result, as in the second and ninth embodiments, the relationship between the reflection intensity distribution in the range direction and the Doppler frequency and the characteristics in the bow and stern directions from the mast become clear.

Eleventh Embodiment In addition, the first embodiment
In FIG. 21, the ISAR image and the range profile are displayed in parallel vertically with the actual lengths being matched. However, in the present embodiment, the feature detection unit 5e in the signal processor 5K in the basic configuration diagram of the radar device shown in FIG. In, the bow and stern are detected by CFAR processing (GOCFAR for detecting edges), the position where the Doppler frequency in the ISAR image signal is maximum is detected, and the positions of the bow, stern and mast are output as characteristic information. .

In the display processing section 5d, the actual lengths of the ISAR image and the range profile are aligned, and the positions of the bow, stern and mast are aligned with these images, and the ISAR image and range profile are displayed in parallel vertically. A display signal for displaying an image in which the bow cursers, the stern cursers, and the mast cursers are superimposed on both images is generated.

The operation display unit 6 displays the image in which the bow curser, the stern curser and the mast curser are superimposed on the superimposed image of the ISAR image and the range profile as shown in FIG. 22 according to the display signal. As a result, similar to the seventh and ninth embodiments, the relationship between the reflection intensity distribution in the range direction and the Doppler frequency, the characteristic in the length direction from the bow, the characteristic in the length direction from the stern, and the bow and stern from the mast The characteristics in each direction become clear.

Twelfth Embodiment In addition, the first embodiment
In FIG. 23, the ISAR image and the range profile are displayed in parallel vertically with the actual lengths matched, but in the present embodiment, the feature detection in the signal processor 5L in the basic configuration diagram of the radar device shown in FIG. 23 is detected. The unit 5e detects the position where the Doppler frequency of the CFAR process is the maximum, and outputs the positions of the bow, stern, and mast as characteristic information.

The display processing unit 5d adjusts the vertical position between the ISAR image and the range profile by adjusting the actual lengths of the images, and also adjusts the bow, stern, and mast of these images. And a display signal for displaying an image in which the bow curser, the stern curser, and the mast curser are superimposed on the superimposed image of the ISAR image and the range profile.

In response to the display signal, the operation display 6 displays an image in which the bow, stern and cursor are superimposed on the superimposed image of the ISAR image and the range profile as shown in FIG. As a result, similar to the eighth and tenth embodiments, the relationship between the reflection intensity distribution in the range direction and the Doppler frequency, the characteristic in the longitudinal direction from the bow, the characteristic in the longitudinal direction from the stern, and the bow and stern from the mast. The characteristics in each direction become clear.

[0079]

According to the present invention, the relationship between the reflection intensity distribution in the range direction and the Doppler frequency can be clarified by the vertical / parallel display of the ISAR image and the Renny profile.
There is an effect that the identification accuracy of the ship target by ISAR is improved.

Further, according to the present invention, the relationship between the reflection intensity distribution in the range direction and the Doppler frequency becomes clear by superimposing the ISAR image and the range profile. , ISAR has the effect of improving the identification accuracy of the ship target.

Further, according to the present invention, an ISAR image,
The vertical / parallel display of the range profile and the superimposed display of the bow cursor also clarify the relationship between the reflection intensity distribution in the range direction and the Doppler frequency, and the characteristics in the length direction from the bow. This has the effect of improving the identification accuracy of.

Further, according to the present invention, an ISAR image,
By superimposing the range profile and the bow-cursor, the relationship between the reflection intensity distribution in the range direction and the Doppler frequency is similarly clarified, and the characteristics in the length direction from the bow are clarified, and the identification accuracy of the ship target by ISAR is improved. There is an effect of doing.

Further, according to the present invention, an ISAR image,
The vertical / parallel display of the range profile and the superimposed display of the stern curver also clarify the relationship between the reflection intensity distribution in the range direction and the Doppler frequency, and the characteristics in the length direction from the stern. This has the effect of improving the identification accuracy of.

Further, according to the present invention, an ISAR image,
By superimposing the range profile and the stern curver, similarly, the relationship between the reflection intensity distribution in the range direction and the Doppler frequency and the characteristics in the length direction from the stern are clarified, and the identification accuracy of the ship target by ISAR is improved. There is an effect of doing.

Further, according to the present invention, an ISAR image,
Similarly, the relationship between the reflection intensity distribution in the range direction and the Doppler frequency can be shown by the vertical / parallel display of the range profile and the superimposed display of the bow and stern cursers, the characteristics in the length direction from the bow, and the length from the stern. This has the effect of clarifying the characteristics of the direction and improving the identification accuracy of the ship target by ISAR.

Further, according to the present invention, an ISAR image,
By superimposing the range profile, bow cursers and stern cursers, similarly, the relationship between the reflection intensity distribution in the range direction and the Doppler frequency, as well as the characteristics in the length direction of the bows and the characteristics in the length direction from the stern are clarified. And ISAR
This has the effect of improving the identification accuracy of the ship target.

Further, according to the present invention, an ISAR image,
By the vertical / parallel display of the range profile and the superimposed display of the mast carcass, similarly, the relationship between the reflection intensity distribution in the range direction and the Doppler frequency becomes clear, and the characteristics in the bow and stern directions from the mast become clear. This has the effect of improving the identification accuracy of the ship target.

According to the present invention, the ISAR image,
Range 7 rob. By superimposing the aisle and mast carcass, similarly, the relationship between the reflection intensity distribution in the range direction and the Doppler frequency becomes clear, and the characteristics in the bow and stern direction from the mast become clear, and the identification accuracy of the ship target by ISAR is improved. It has the effect of improving.

Further, according to the present invention, an ISAR image,
Vertical / horizontal display of range profile, bow cursor,
By superimposing the stern and mast carcass, similarly, the relationship between the reflection intensity distribution in the range direction and the Doppler frequency, the characteristics in the length direction from the bow, and the characteristics in the length direction from the stern can be calculated from the mast. The features in the bow and stern directions are clarified, and the identification accuracy of the ship target by ISAR is improved.

Further, according to the present invention, an ISAR image,
By superimposing the range profile, bow cursers, stern cursers, and mast cursers, similarly, the relationship between the reflection intensity distribution in the range direction and the Doppler frequency, the characteristics in the length direction from the bow, and the characteristics in the length direction from the stern The feature is
The characteristics from the mast to the bow and stern are clarified,
There is an effect that the identification accuracy of the ship target by ISAR is improved.

[Brief description of drawings]

FIG. 1 is a basic configuration diagram of a radar device according to a first embodiment.

FIG. 2 is an explanatory diagram of image display according to the first embodiment.

FIG. 3 is a basic configuration diagram of a radar device according to a second embodiment.

FIG. 4 is an explanatory diagram of image display according to the second embodiment.

FIG. 5 is a basic configuration diagram of a radar device according to a third embodiment.

FIG. 6 is an explanatory diagram of an image and a cursor display according to the third embodiment.

FIG. 7 is a basic configuration diagram of a radar device according to a fourth embodiment.

FIG. 8 is an explanatory diagram of an image and a cursor display according to the fourth embodiment.

FIG. 9 is a basic configuration diagram of a radar device according to a fifth embodiment.

FIG. 10 is an explanatory diagram of images and cursor display according to the fifth embodiment.

FIG. 11 is a basic configuration diagram of a radar device according to a sixth embodiment.

FIG. 12 is an explanatory diagram of images and cursor display according to the sixth embodiment.

FIG. 13 is a basic configuration diagram of a radar device according to a seventh embodiment.

FIG. 14 is an explanatory diagram of an image and a cursor display according to the seventh embodiment.

FIG. 15 is a basic configuration diagram of a radar device according to an eighth embodiment.

FIG. 16 is an explanatory diagram of an image and a cursor display according to the eighth embodiment.

FIG. 17 is a basic configuration diagram of a radar device according to a ninth embodiment.

FIG. 18 is an explanatory diagram of an image and a cursor display according to the ninth embodiment.

FIG. 19 is a basic configuration diagram of a radar device according to a tenth embodiment.

FIG. 20 is an explanatory diagram of images and cursor display according to the tenth embodiment.

FIG. 21 is a basic configuration diagram of a radar device according to an eleventh embodiment.

FIG. 22 is an explanatory diagram of images and cursor display according to the eleventh embodiment.

FIG. 23 is a basic configuration diagram of a radar device according to a twelfth embodiment.

FIG. 24 is an explanatory diagram of an image and cursor display according to the twelfth embodiment.

FIG. 25 is a basic configuration diagram of a conventional radar device.

FIG. 26 is an explanatory diagram of conventional image display.

FIG. 27 is an explanatory diagram of a positional relationship between a target and radar.

FIG. 28 is a diagram illustrating a relationship between a ship target and a processed image.

FIG. 29 is an explanatory diagram of a conventional ISAR processing flow.

[Explanation of symbols]

1 transmitter, 2 circulator, 3 antenna, 4 receiver, 5A to 5L signal processor, 5a beam control unit,
5b Tracking processing unit, 5c ISAR processing unit, 5d Display processing unit, 5e Feature detection unit, 6 Operation display unit, 7 Antenna controller.

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G01S ⁷ /00-7/42 G01S 13/00-13/95

Claims (15)

(57) [Claims] 1. A transmitter that generates a transmission signal, an antenna that radiates the transmission signal and receives a reflected signal from a target, a receiver that receives and processes the reflected signal to generate a video signal, and A signal processor for performing synthetic aperture processing on a video signal to generate an ISAR image signal and an image signal of a range profile, and a display processing unit for generating a display signal for displaying these image signals on the same screen are provided. A radar device characterized by. 2. The radar according to claim 1, wherein the display processing unit generates a display signal for displaying an image in which the ISAR image and the actual length of the range profile are aligned and the images vertically arranged in parallel are displayed. apparatus. 3. The display processing unit generates a display signal for displaying an image in which an ISAR image and an actual length of a range profile are superposed together.
The radar device according to 1. 4. A transmitter for generating a transmission signal, an antenna for radiating the transmission signal and receiving a reflected signal from a target, a receiver for receiving and processing the reflected signal to generate a video signal, A signal processor for performing synthetic aperture processing on a video signal to generate an ISAR image signal and an image signal of a range profile;
A feature detection unit that detects the above features by CFAR processing and outputs feature information, and a display processing unit that generates a display signal for displaying the image signals and the feature information on the same screen are provided. Radar device. 5. The feature detecting unit outputs, as feature information, at least one of a bow, a stern detected by CFAR processing and a mast detected by Doppler processing for a target ship by a vertical cursor. The radar device according to claim 4. 6. The display processing unit displays the bow detected by the CFAR processing on an image arranged in parallel above and below in which the actual lengths of the ISAR image and the range profile are combined,
The radar device according to claim 4 or 5, wherein a display signal for displaying an image superimposed by the display by the vertical cursor is generated. 7. The display processing unit adds an ISAR image and an image obtained by superimposing an actual length of a range profile together,
The radar device according to claim 4 or 5, wherein a display signal for displaying an image in which the bow detected by the CFAR processing is superimposed by a display by a vertical cursor is displayed. 8. The stern detected by the CFAR processing is added to the images arranged in parallel above and below the actual lengths of the ISAR image and the range profile,
The radar device according to claim 4 or 5, wherein a display signal for displaying an image superimposed by the display by the vertical cursor is generated. 9. The display processing unit adds an ISAR image and an image obtained by superimposing an actual length of a range profile to each other,
The radar apparatus according to claim 4 or 5, wherein a display signal for displaying an image in which the stern detected by the CFAR processing is superimposed by display by a vertical cursor is displayed. 10. The display processing unit superimposes the bow and stern detected by the CFAR processing on an image arranged in parallel above and below in which the actual lengths of the ISAR image and the range profile are combined, in a display by a vertical cursor. The radar device according to claim 4 or 5, wherein a display signal for displaying the selected image is generated. 11. The display processing unit displays an image in which the bow and stern detected by the CFAR processing are superimposed on a superimposed image in which the actual lengths of the ISAR image and the range profile are combined by a vertical cursor display. The radar device according to claim 4 or 5, wherein a display signal to be displayed is generated. 12. The display processing unit superimposes the mast detected by the Doppler processing on an image arranged in parallel in the vertical direction in which the actual lengths of the ISAR image and the range profile are combined, in a display by a vertical cursor. The radar device according to claim 4 or 5, wherein a display signal for displaying an image is generated. 13. The display processing unit displays an image in which the mast detected by the Doppler processing is superimposed on the superimposed image in which the actual lengths of the ISAR image and the range profile are superimposed, by a vertical cursor display. The radar device according to claim 4, wherein the radar device generates a display signal. 14. The display processing unit includes a bow detected by the CFAR processing on an image arranged in parallel above and below in which actual lengths of an ISAR image and a range profile are combined,
The radar device according to claim 4, wherein a display signal for displaying an image in which the mast detected by the stern and Doppler processing is superimposed by the display by the vertical cursor is generated. 15. The display processing unit displays, on a superimposed image in which the actual lengths of the ISAR image and the range profile are combined, the mast detected by the bow, stern, and Doppler processing detected by the CFAR processing by a vertical cursor. The radar device according to claim 4 or 5, wherein a display signal for displaying an image superimposed on the display is generated.