JP2001201570A - Radar device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To clarify the relation between range-directional reflection intensity distribution and Doppler frequency to improve the recognition certainty of a vessel target by ISAR by vertically displaying an ISAR image and a range profile vertically in a line one above another while matching the ISAR image to the actual length of the range profile. SOLUTION: This radar device comprises a transmitter 1 for generating a transmission signal; an antenna 3 for transmitting the transmission signal and receiving a reflection signal from the target; a receiver 4 for receiving the reflection signal to generate a video signal; an ISAR processing part 5c for performing a synthetic aperture processing to the video signal to generate an ISAR image signal and the image signal of the range profile; and a display processing part 5d for generating a display signal for displaying these image signals on the same screen.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventional high resolution radar, ISAR
(Inverse SyntheticApertur
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, reference numeral 4 denotes a receiver that generates a transmission seed signal, 1 denotes a transmitter that amplifies the output of the receiver 4 to generate a transmission signal, and 2 denotes a transmitter. 1 is a circulator that supplies the output of the antenna 1 to the antenna 3 and supplies the reception signal from the antenna 3 to the receiver 4.

[0005] Reference numeral 5 denotes a signal processor for processing the radar video output from the receiver 4, and the signal processor 5 performs an ISAR processing section 5 c 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 controller 5a for calculating the antenna beam direction,
It comprises a display processing unit 5d for processing display data.

[0004] 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, and 7 denotes an antenna control for controlling an antenna beam azimuth by 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 emitted signal is reflected from 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 to increase the resolution in the range direction (distance direction from the antenna 3) in the receiver 4, and then becomes A / D-converted digital radar video. The radar video is quantized and stored in a range cell divided according to the distance from the radar. On the other hand, the ISAR achieves high resolution in a cross range direction (a direction orthogonal to the range direction) by performing synthesis on an aperture surface.

By increasing the resolution in the cross range direction by the ISAR processing and by increasing the resolution in the range direction by the above-described pulse compression, the ISAR processing section 5c
Generates a target image signal. The display processing unit 5d converts the image signal into a display signal, and outputs the display signal to the operation display unit 6 to output the image signal as shown in FIG.
The target is displayed as an image as shown in FIG. The tracking processing unit 5b detects a target from the radar video, performs a tracking calculation process using a tracking filter, and calculates the azimuths of the target AZ and EL.

The beam control unit 5a generates a beam control signal from the target azimuth consisting of AZ (azimuth direction) and EL (elevation direction) calculated by the tracking processing unit 5b and an angle signal from the antenna controller 7 to generate an antenna control signal. 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, an image of the range profile shown in FIG. 28B and an ISAR image shown in FIG. 28A are generated and displayed on the operation display section 6 shown in the basic configuration diagram of the radar of FIG.

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, range information after ISAR processing is displayed in the horizontal direction, and Doppler information is displayed in the vertical direction. The optical image corresponding to the range profile and the display mode of the ISAR image (bow and stern direction) is shown in FIG.
This is as shown in FIG.

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

Next, autofocusing is performed on the frequency axis based on time / frequency information, and a target Doppler frequency and a Doppler frequency are integrated based on a tracking speed to calculate a phase amount as a phase compensation amount. Based on the amount of phase compensation, the Doppler shift due to the movement of the target is compensated for the radar video data by complex multiplication. The FF is applied to the compensated radar video data.
Perform T (Fast Fourier Transform) and shake the target (roll,
Pitch, yaw frequency) components are discriminated. Then, the amplitude of the signal is detected, and an image signal is generated and output.

The image processing unit 5d converts and outputs the image signal to a display signal that matches the resolution, display luminance dynamic range, operation information, and the like of the operation display unit 6, and the operation display unit 6 performs, as shown in FIG. For an ISAR image, range information is displayed in the horizontal direction, Doppler information is displayed in the vertical direction, and reflection intensity is displayed as luminance.

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, and controls the antenna.
The above is the operation of the conventional radar device / ISAR.

[0016]

The conventional radar apparatus is configured as described above, and displays only the information of the range, Doppler, and reflection intensity because the ISAR image is displayed on the operation display unit in a single manner. However, there is a problem that the identification accuracy is small compared to the target identification by imaging the target, which is the original purpose of the ISAR.

The present invention has been made in order to solve the above-described problems, and has as its object 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 from a target (also referred to as a reception signal); A receiver that performs reception processing to generate 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 displays these image signals 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 generates a display signal for displaying an image arranged vertically in parallel by matching the actual length of the ISAR image with the actual length of the range profile.

The display processing unit according to the present invention generates a display signal for displaying an image obtained by superimposing an ISAR image and an actual length of a range profile together.

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 reflected signal from a target (also referred to as a received signal), and a video signal for receiving the reflected signal. A receiver that generates
A signal processor for performing a synthetic aperture process on the video signal to generate an ISAR image signal and a range profile image signal;
The image processing apparatus further includes a feature detection unit that detects and outputs feature information by performing an R process, and a display processing unit that generates a display signal for displaying each of the image signals and the feature information on the same screen.

The feature detecting section of the present invention outputs, as feature information, at least one of a bow, a stern, and a mast detected by Doppler processing detected by CFAR processing to a target ship by a vertical cursor.

The display processing unit according to the present invention superimposes the bow detected by the CFAR 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 matched by display by a vertical cursor. A display signal for displaying an image is generated.

The display processing unit according to the present invention displays an image obtained by superimposing the bow detected by the CFAR processing on the superimposed image obtained by matching the actual length of the range profile and the actual length of the range profile by displaying 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 a vertically aligned image displayed on the vertically arranged image corresponding to the actual length of the ISAR image and the range profile. A display signal for displaying an image is generated.

The display processing unit according to the present invention displays an image in which the stern detected by the CFAR processing is superimposed on the superimposed image obtained by matching the actual length of the range profile and the actual length of the range profile 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 vertically arranged images corresponding to the actual lengths of the ISAR image and the range profile. A display signal for displaying the displayed image is generated.

The display processing unit according to the present invention provides an image obtained by superimposing the bow and stern detected by the CFAR processing on a superimposed image obtained by matching the actual length of the range profile and the actual length of the range profile by displaying a vertical cursor. A display signal to be displayed is generated.

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

The display processing unit according to the present invention displays an image obtained by superimposing the mast detected by the Doppler processing on a superimposed image obtained by combining the ISAR image and the actual length of the range profile by a vertical cursor. A display signal is generated.

[0031] The display processing unit of the present invention includes, on an image arranged in parallel in the vertical direction in which the actual lengths of the ISAR image and the range profile are matched, the bow, stern, and mast detected by the CFAR processing. ,
This is to generate a display signal for displaying an image superimposed on the display by the vertical cursor.

The display processing section of the present invention uses a vertical cursor to detect the bow, stern, and mast detected by the Doppler processing detected by the CFAR processing on an image obtained by superimposing the actual length of the range profile and the ISAR image. This is to generate a display signal for displaying an image superimposed on the display.

[0033]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, a radar apparatus (ISAR) according to the present invention will be described 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 that generates a transmission seed signal, 1 is a transmitter that amplifies the output of the receiver 4 and generates a transmission signal, and 2 is a device that supplies the output of the transmitter 1 to the antenna 3 and outputs the signal from the antenna 3. A circulator that supplies a reception signal to the receiver 4.

Reference numeral 5A denotes a signal processor according to the present embodiment. The signal processor 5A performs an ISAR processing section 5c that performs high-resolution processing (ISAR processing) based on the output of the receiver 4.
It comprises a tracking processing unit 5b for tracking a target, a beam control unit 5a for calculating an antenna beam direction, and a display processing unit 5d for processing display data.

Reference numeral 6 denotes 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. Reference numeral 7 controls the antenna beam azimuth 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 transmission seed signal generated by the receiver 4 is amplified by 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 emitted signal is reflected from 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 to increase the resolution in the range direction (distance direction from the antenna 3) in the receiver 4, and then becomes A / D converted digital radar video. The radar video is quantized and stored in a range cell divided according to the distance from the radar.

On the other hand, the ISAR achieves high resolution in the cross range direction (direction orthogonal to the range direction) by performing synthesis on the aperture surface. By increasing the resolution in the cross-range direction by the ISAR processing and increasing the resolution in the range direction by the above-described pulse compression, the display processing unit 5c of the ISAR displays a range profile (see FIG. 28B) and an ISAR image ( FIG. 28 (a)
) Are generated for 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 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 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 ), 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, range information after ISAR processing is displayed in the horizontal direction, and Doppler information is displayed in the vertical direction. The optical image corresponding to the range profile and the display mode of the ISAR image (bow and stern direction) is shown in FIG.
(C).

Here, the contents of the ISAR process will be described with reference to FIG. The ISAR processing unit 5c tracks the target of the radar video data on the time axis based on the distance / amplitude information of the data, and calculates the amount of movement in units of range cells for each pulse hit as the amount of distance compensation. Based on the distance compensation amount, the deviation of the distance due to the movement of the target is distance compensated for the radar video in units of range cells. 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 the Doppler frequency are integrated based on the tracking speed to calculate a phase amount as a phase compensation amount. Based on the amount of phase compensation, the Doppler shift due to the movement of the target is compensated for the radar video data by complex multiplication. The FF is applied to the compensated radar video data.
T is performed to discriminate a target fluctuation (roll, pitch, yaw frequency) components. Then, the amplitude of the signal is detected and I
Generate and output a SAR image signal.

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

The display processing unit 5d adjusts the actual lengths of the image signals of the ISAR image and the range profile, arranges the two images so that they are displayed vertically in parallel, and sets the resolution of the operation display unit 6 and the display luminance dynamic range. , And converts and outputs a display signal that matches the operation information. In the operation display unit 6, as shown in FIG. 2, the ISAR image is arranged on the upper side and the range profile is arranged on the lower side. 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 controls the antenna 3 by generating an antenna drive signal from the beam control signal from the signal processor 5 and the angle signal from the antenna 3. The above is the operation of the radar device / lSAR of the first embodiment.

Embodiment 2 In the first embodiment, the ISAR image and the range profile are displayed vertically in parallel with the actual length, but in the present embodiment, the signal processing shown in the basic configuration diagram of the radar apparatus shown in FIG. The display processing unit 5d in the device 5B adjusts the vertical position by matching the actual lengths of the ISAR image and the range profile image signals, and generates a display signal for displaying an image in which both images are superimposed. Generate.

The operation display 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, as in the first embodiment, the relationship between the reflection intensity distribution in the range direction and the Doppler frequency becomes clear.

Embodiment 3 In the first embodiment, the ISAR image and the range profile are displayed vertically in parallel with the actual length, but in the present embodiment, the signal processor shown in the basic configuration diagram of the radar apparatus shown in FIG. The characteristic detecting unit 5e in 5c detects a bow by CFAR processing (GOCFAR for detecting an edge) and outputs the position of the bow as characteristic information.

The display processing unit 5d displays the ISAR image output from the ISAR processing unit 5c in parallel with the ISAR image output from the ISAR image processing unit 5c by adjusting the actual length of the range profile and the bow position. I displayed
CFA is added to both the SAR image and the range profile image.
A display signal of an image in which the bow detected by the R processing is arranged by a bow cursor is generated.

As shown in FIG. 6, the operation display 6 displays an ISAR image and a range profile in a vertically parallel manner as shown in FIG. 6, and displays an image in which a bow cursor is superimposed on both images. As a result, as in the second embodiment, 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 become clear.

Embodiment 4 In the first embodiment, the ISAR image and the range profile are displayed side by side with the actual length in the vertical direction.
Signal processor 5D in the basic configuration diagram of the radar device shown in FIG.
The feature detector 5e in the middle detects the bow by CFAR processing (GOCFAR for detecting edges) and outputs the position of the bow as feature information.

The display unit 5d performs vertical position adjustment on the ISAR image signal output from the ISAR processing unit 5c by adjusting the actual length of the range profile and the position of the bow. Further, a display signal for displaying an image by superimposing a bow cursor on an image in which both the ISAR image and the range profile image are superimposed is generated.

As shown in FIG. 8, the operation display unit 6 superimposes both the ISAR image and the range profile image on the basis of the display signal, and displays an image in which the bow cursor is superimposed on both images. As a result, as in the second embodiment, 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 become clear.

Embodiment 5 In the first embodiment, the ISAR image and the range profile are displayed vertically in parallel with the actual length, but in the present embodiment, the signal processor in the basic configuration diagram of the radar apparatus shown in FIG. The feature detection unit 5e in 5E detects a stern by CFAR processing (GOCFAR for detecting an edge) and outputs the position of the stern as feature information.

The display processing section 5d displays the actual lengths of the ISAR image and the range profile, and the position of the stern with each image, so that these images are displayed vertically one above the other. The stern force sensor generates a display signal for displaying the displayed image.

The operation display unit 6 displays the ISAR image and the range profile image vertically in parallel as shown in FIG. 10 according to the display signal, and displays an image in which the stern cursor is superimposed on the two images. As a result, as in the third embodiment, 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 become clear.

Embodiment 6 FIG. In the first embodiment, the ISAR image and the range profile are displayed vertically in parallel with the actual length, but the feature detector in the signal processor 5F in the basic configuration diagram of the radar apparatus shown in FIG. 5
e is CFAR processing (GOCFAR for detecting an edge)
And outputs the position of the stern as feature information.

The display processing unit 5d adjusts the vertical position by adjusting the actual lengths of the ISAR image signal and the range profile image signal.
On the image in which the SAR image and the range profile are superimposed,
A display signal for displaying the image on which the stern cursor is superimposed is generated.

As shown in FIG. 12, the operation display 6 superimposes and displays both the ISAR image and the range profile image according to the display signal, and displays an image in which the stern cursor is superimposed on both images. As a result, as in the fourth embodiment, 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 become clear.

Embodiment 7 In the first embodiment, the ISAR image and the range profile are displayed vertically in parallel with the actual length. However, the feature detection unit in the signal processor 5G in the basic configuration diagram of the radar apparatus shown in FIG. 5
e, CFAR processing (GOCF for detecting edges)
AR) to detect the bow and stern, and output the positions of the bow and stern as feature information.

The display processing unit 5d adjusts the actual lengths of both the ISAR image and the range profile image,
By matching the positions of the bow and stern to both images, ISAR
A display signal is generated in which both images of the image and the range profile are displayed so as to be vertically arranged in parallel, and an image in which the bow force and the stern cursor are arranged is displayed on both images.

As shown in FIG. 14, the operation display 6 displays both the ISAR image and the range profile vertically in parallel as shown in FIG. 14, and the bow cursor and the stern cursor 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 longitudinal direction from the bow, and the characteristic in the longitudinal direction from the stern are clarified.

Embodiment 8 FIG. In the first embodiment, the ISAR image and the range profile are displayed vertically in parallel with the actual length, but the characteristic in the signal processor 5H which can be shown in the basic configuration diagram of the radar apparatus shown in FIG. In the detection unit 5e, CFAR processing (GOC for edge detection) is performed.
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 feature information.

The display processing unit 5d adjusts the actual lengths of the two image signals based on the characteristic information, adjusts the vertical position, and adjusts the positions of the bow and stern to the two images to obtain the IS.
A display signal is generated for displaying an image in which both the AR image and the range profile image are superimposed on the bow cursor and the stern cursor.

The operation display 6 displays an image in which the bow and stern cursor are superimposed on the superimposed image of the ISAR image and the range profile as shown in FIG. As a result, similarly to the fourth and sixth embodiments, 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 become clear.

Embodiment 9 In the first embodiment, the ISAR image and the range profile are displayed side by side with the actual length in the vertical direction.
Signal processor 5I in the basic configuration diagram of the radar device shown in FIG.
The feature detector 5e in the middle detects the position where the Doppler frequency in the ISAR image signal is the highest, and outputs the position of the mast as feature information (assuming that the mast is the highest structure 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.

The display processing unit 5d adjusts the actual lengths of the ISAR image and the range profile, and also adjusts the positions of the masts with respect to the two images, so that the two images of the ISAR image and the range profile can be displayed vertically in parallel. And a display signal for displaying an image in which a mast cursor is superimposed on both images is generated. As a result, as shown in FIG.
The characteristics of the AR image, the range profile and the direction from the mast to the bow and stern direction become clear.

Embodiment 10 FIG. In the first embodiment,
In FIG. 1, the ISAR image and the range profile are displayed side by side with the actual length in the vertical direction.
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 where the Doppler frequency in the ISAR image signal is maximum, and outputs the position of the mast as feature information.

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

As shown in FIG. 20, the operation display 6
An image in which the mast cursor 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 from the mast to the bow and stern directions become clear.

Embodiment 11 FIG. In the first embodiment,
In FIG. 21, the ISAR image and the range profile are displayed vertically in parallel with the actual length, but in the present embodiment, the feature detection unit 5e in the signal processor 5K in the basic configuration diagram of the radar apparatus shown in FIG. , 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. .

The display processing unit 5d displays the actual lengths of the ISAR image and the range profile, and adjusts the positions of the bow, stern, and mast with respect to these images, and displays the ISAR image and the range profile so as to be displayed vertically. A display signal is generated to display an image in which a bow cursor, a stern cursor and a mast cursor are superimposed on the two images.

The operation display 6 displays an image in which a bow cursor, a stern cursor and a mast cursor are superimposed on the superimposed image of the ISAR image and the range profile as shown in FIG. As a result, similarly to Embodiments 7 and 9, the relationship between the reflection intensity distribution in the range direction and the Doppler frequency, the longitudinal characteristics from the bow, the longitudinal characteristics from the stern, and the bow and stern from the mast The characteristics of each direction become clear.

Embodiment 12 FIG. In the first embodiment,
In FIG. 23, the ISAR image and the range profile are displayed vertically in parallel with the actual length. In this embodiment, however, the feature detection in the signal processor 5L in the basic configuration diagram of the radar apparatus shown in FIG. The unit 5e detects the position where the Doppler frequency of the CFAR process is maximum, and outputs the position of the bow, stern, and mast as feature information.

The display processing section 5d adjusts the vertical position between the ISAR image and the range profile by matching the actual lengths of the two images. And a display signal for displaying an image in which the bower stern, the stern cursor and the mast cursor are superimposed on the superimposed image of the ISAR image and the range profile is generated.

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. 24 according to the display signal. As a result, as in Embodiments 8 and 10, the relationship between the reflection intensity distribution in the range direction and the Doppler frequency, the longitudinal characteristics from the bow, the longitudinal characteristics from the stern, and the bow and stern from the mast The characteristics of 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 becomes clear by displaying the ISAR image and the range profile vertically / parallel.
There is an effect that the accuracy of identification of a ship target by ISAR is improved.

According to the present invention, the relationship between the reflection intensity distribution in the range direction and the Doppler frequency is similarly clarified by superimposing and displaying the ISAR image and the range profile. In addition, there is an effect that the accuracy of identification of a ship target by ISAR is improved.

According to the present invention, an ISAR image,
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 bow are clarified by the vertical / parallel display of the range profile and the superimposed display of the bow cursor, and the ship target by ISAR This has the effect of improving the identification accuracy of.

According to the present invention, an ISAR image,
Similarly, the relationship between the reflection intensity distribution in the range direction and the Doppler frequency and the characteristics in the longitudinal direction from the bow are clarified by the superimposed display of the range profile and the bower cursor, and the accuracy of identification of the ship target by ISAR is improved There is an effect of doing.

According to the present invention, an ISAR image,
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 by the vertical / parallel display of the range profile and the superimposed display of the stern cursor, and the ship target by ISAR This has the effect of improving the identification accuracy of.

According to the present invention, an ISAR image,
Similarly, the relationship between the reflection intensity distribution in the range direction and the Doppler frequency and the characteristics in the longitudinal direction from the stern are clarified by the superimposed display of the range profile and the stern cursor, and the accuracy of identification of the ship target by ISAR is improved. There is an effect of doing.

According to the present invention, an ISAR image,
Similarly, the relationship between the reflection intensity distribution in the range direction and the Doppler frequency, the longitudinal characteristics from the bow, and the length from the stern are also shown by the vertical / horizontal display of the range profile and the superimposed display of the bow cursor and the stern cursor. There is an effect that the characteristics of the direction are clarified, and the accuracy of identification of the ship target by the ISAR is improved.

According to the present invention, an ISAR image,
Similarly, the relationship between the reflection intensity distribution in the range direction and the Doppler frequency, the longitudinal characteristics of the bows, and the longitudinal characteristics from the stern are clarified by the superimposed display of the range profile, the bow cursor and the stern cursor. And ISAR
Therefore, there is an effect that the identification accuracy of the ship target by the above is improved.

According to the present invention, an ISAR image,
Similarly, the relationship between the reflection intensity distribution in the range direction and the Doppler frequency, and the characteristics from the mast to the bow and stern direction are clarified by the vertical / parallel display of the range profile and the superimposed display of the mast cursor. There is an effect that the identification accuracy of the ship target is improved.

Further, according to the present invention, an ISAR image,
Range 7 lob. Similarly, the superimposed display of the aisle and mast carcer clarifies the relationship between the reflection intensity distribution in the range direction and the Doppler frequency, the characteristics from the mast in the bow and stern direction, and the accuracy of identification of the ship target by ISAR. There is an effect of improving.

According to the present invention, an ISAR image,
Range profile top / bottom / parallel display, bow cursor,
Similarly, the relationship between the reflection intensity distribution in the range direction and the Doppler frequency, and the characteristics in the longitudinal direction from the bow and the characteristics in the longitudinal direction from the stern are also shown by the superimposed display of the stern and mast cursors. The features in the bow and stern directions are clarified, and there is an effect that the accuracy of identification of a ship target by ISAR is improved.

According to the present invention, an ISAR image,
Similarly, the relationship between the reflection intensity distribution in the range direction and the Doppler frequency, the characteristics in the longitudinal direction from the bow, and the longitudinal Features are
The characteristics of the bow and stern from the mast have been clarified,
There is an effect that the accuracy of identification of a ship target by ISAR is improved.

[Brief description of the drawings]

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

FIG. 2 is an explanatory diagram of an 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 an 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 an image and a 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 an image and a 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 an image and a 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 an image and a 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 a 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 a 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 processing 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, 7 antenna controller.

Claims (15)

[Claims] 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 the 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. A radar device characterized by the following. 2. The radar according to claim 1, wherein the display processing unit matches the actual length of the ISAR image with the actual length of the range profile and generates a display signal for displaying an image arranged vertically in parallel. apparatus. 3. The display processing unit according to claim 1, wherein the display processing unit generates a display signal for displaying an image obtained by superimposing the ISAR image on the actual length of the range profile.
A radar device according to item 1. 4. A transmitter for generating a transmission signal, an antenna for emitting 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 a synthetic aperture process 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 each of the image signals and the feature information on the same screen. Radar equipment. 5. The feature detection unit outputs at least one of a bow, a stern, and a mast detected by a Doppler process detected by a CFAR process to a target ship by a vertical cursor as feature information. The radar device according to claim 4. 6. The display processing unit includes a bow detected by the CFAR 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.
The radar apparatus according to claim 4, wherein a display signal for displaying an image superimposed by display by a vertical cursor is generated. 7. The display processing unit according to claim 1, wherein the ISAR image is superimposed on an image obtained by superimposing the actual length of the range profile.
The radar apparatus according to claim 4, wherein a display signal for displaying an image in which a bow detected by the CFAR processing is superimposed on a display by a vertical cursor is generated. 8. The display processing unit according to claim 1, wherein the stern detected by the CFAR processing is added to an upper and lower parallel image obtained by matching the actual lengths of the ISAR image and the range profile.
The radar apparatus according to claim 4, wherein a display signal for displaying an image superimposed by display by a vertical cursor is generated. 9. The display processing unit according to claim 1, wherein the ISAR image is superimposed on an image obtained by superimposing the actual length of the range profile.
The radar apparatus according to claim 4, wherein a display signal for displaying an image in which a stern detected by the CFAR processing is superimposed on a display by a vertical cursor is generated. 10. The display processing unit superimposes the bow and stern detected by the CFAR processing on an image arranged in parallel in a vertical direction in which the actual lengths of the ISAR image and the range profile are matched, by displaying with a vertical cursor. The radar apparatus according to claim 4, wherein a display signal for displaying the displayed image is generated. 11. The display processing unit according to claim 1, wherein the image obtained by superimposing the bow and stern detected by the CFAR processing on the superimposed image obtained by combining the actual length of the range profile and the ISAR image by displaying the vertical cursor. The radar device according to claim 4, wherein a display signal to be displayed is generated. 12. The display processing unit superimposes a mast detected by the Doppler processing on an image arranged in parallel in an upper and lower direction according to an actual length of an ISAR image and a range profile by display by a vertical cursor. The radar device according to claim 4, wherein a display signal for displaying an image is generated. 13. The display processing unit displays an image in which a mast detected by the Doppler processing is superimposed on a superimposed image obtained by matching the actual length of an ISAR image and a range profile with a vertical cursor. The radar apparatus according to claim 4, wherein the radar apparatus generates a display signal. 14. The display processing unit according to claim 1, further comprising: a bow detected by the CFAR processing, on an image arranged in parallel in a vertical direction in which the actual lengths of the ISAR image and the range profile are combined.
The radar apparatus according to claim 4, wherein a display signal is generated to display an image in which a mast detected by stern and Doppler processing is superimposed by display by a vertical cursor. 15. The display processing unit according to claim 1, further comprising: a superimposed image obtained by combining the ISAR image and the actual length of the range profile with a bow, a stern, and a mast detected by Doppler processing detected by the CFAR processing. The radar apparatus according to claim 4, wherein a display signal for displaying an image superimposed on the display is generated.