JP2001159678A - Object judgment method by radar and radar device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radar device with small size and an excellent mobility capable of size-judging to a predetermined size of an object with no need an expensive large scale device such as a complicated object identifying device and large aperture antenna having high azimuth resolution. SOLUTION: The device comprises an object correlation processing part 9 that determines a range that each object exists and an expansion in a cross range direction (object range) from a threshold judgment result to object amplitude can be measured by the radar device and then a receiving echo length of an object length in a radar direction from the expansion in the range direction, a RCS(Radar Cross Section) computing process part 13 that determines RCSs of all range bins where the objects are detected from the object amplitude and distance, and then a maximum value of the RCSs in the object range of every object, and an object size judgment part 10 judging the object size from the object receiving echo length and the RCS maximum value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to radar target determination, and more particularly to a radar target determination method and radar apparatus for determining the size of a target.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram of a general radar device. Hereinafter, a method of determining the size of a target using the radar apparatus shown in FIG. 4 will be described. A transmitter 1 for generating a radar transmission signal, an antenna 1 for radiating the transmission signal in a target direction and searching for a space, a transmission / reception switch 2, and a receiver 5 for receiving a reflected wave from the antenna 1; Signal processing unit 6 for generating a radar video signal for display from the received signal
And a display unit 7 for displaying radar video.

In the conventional radar apparatus, it can be considered that the spread and brightness of the radar video displayed on the display unit 7 correspond to the target size. Therefore, when determining the size of the target from the size of the target, the operator of the radar apparatus visually checks the displayed radar video, and determines the size of the target while considering the target distance based on the spread and brightness. There is. In this method, two existing at the same distance
This is an effective method for determining the relative size of two targets.However, in order to determine the size of targets at different distances or to determine the absolute size of targets, considerable skill is required by the radar operator. Is required.

Next, an example in which the operator does not judge the size of the target but automatically makes it in the radar device will be described with reference to FIGS. 5 and 6. FIG.

FIG. 5 is a block diagram showing an example of a radar apparatus for automatically determining the magnitude of a target. Also, FIG.
FIG. 6 is a diagram illustrating a method of determining a target size in the radar device of FIG. 5. In general, if the performance of a radar apparatus has a high range resolution and a high azimuth resolution enough to obtain fragmented measurement data corresponding to the size of a target to be measured, as shown in FIG. Since the size and shape of the target itself can be imaged by the beam search in the direction of the reception echo length Le and the reception cross range θc, it is possible to determine the size of the target by calculating its area. The target determination shown in FIG. 5 is of this type. As a configuration of the radar apparatus, a target detection signal is output to the output side of a signal processing unit 6 which outputs a radar video signal and outputs an angle signal and a range clock signal. The target detection unit 21 to be output, the angle signal, the range clock signal, and the target detection signal are input, and a target area S, a center value Rm (center distance) of a target distance R and a target direction θ, which will be described later, It has a target correlation processing unit 22 including a target detection memory 11 that outputs θm (center direction) and a target area calculation unit 24, and a target size determination unit 23 that determines the size of the target. Hereinafter, the operation of the radar apparatus of FIG. 5 will be described.

The amplitude of the radar video signal output from the signal processing section 6 generally increases when a target exists, and decreases when no target exists. Utilizing this property, the target detection unit 8 sets a predetermined threshold level for the amplitude of the radar video to determine whether or not there is a target.
The determination result is output to the target correlation processing unit 9 as a target detection signal. At this time, the signal processing unit 6 outputs the angle signal of the radar transmission azimuth and the range clock signal to the target correlation processing unit 9 in synchronization with the target detection signal.

[0007] The target detection memory 11 of the target correlation processing section 9 is based on the angle signal of the radar transmission azimuth and the range clock signal input in synchronization with the target detection signal from the signal processing section 6 as shown in FIG. The target detection signals (target “1”, target “0”) are held for each range bin (range cell) corresponding to the target distance (range) and azimuth as shown.

Further, the target correlation processing section 9 searches for target detection data of a distance and an azimuth adjacent to a certain target detection data which is determined to be “present” and is stored in the target detection memory 11. Target detection data to be merged into one target as target detection data from the same target. Then, an integrated set of target detection data is regarded as one target, and the target area calculation unit 17 calculates the area (target area) S of the set by the area of each target detection data constituting the target (FIG. 6 (b)).

For example, the target data is stored in the target detection memory 1
In FIG. 1, when the target area exists as shown in FIG. 6B, the target area S is calculated by the following equation. Target area S = area of target distance R1 + area of target distance R2 + area of target distance R3 + area of target distance R4 where area of target distance Rn = ΔLe × ｛(Rn × SIN
(Δθ)) × θcn｝ ΔLe: distance equivalent to one range bin Δθ: minimum unit of angle resolution of the radar device (angle step width) θcn: number of angle steps of target data at distance Rn The calculated target area S is the target The target size determination unit 10 includes the center values Rm (center distance) and θm (center direction) of the target distance R and the target direction θ in the set of detection data.
Sent to

In the target size determination section 10, the target area S
Is compared with a database stored in advance, the magnitude of the target is determined, and the determination result is symbolized and output to the display unit 7 together with the center distance Rm and the center direction θm.

As described above, the operator can know the size of the target only by checking the type of the target symbol corresponding to the result of the target size determination without visually checking the display video on the display unit 7. However, in the radar device of FIG. 5,
As described above, as shown in FIG. 6B, it is necessary that the target detection memory 11 has a sufficiently high range resolution and a high direction resolution with respect to the target size so that the target size can be held in a somewhat imaged form. is important. Here, the high range resolution can be realized without increasing the scale of the entire radar apparatus by adopting a high pulse compression method by increasing the speed of the range clock and widening the transmission pulse. High azimuth resolution can be realized by employing a large aperture antenna or synthetic aperture processing.

[0012]

The conventional system described above has the following problems. That is, in the target size determination by the radar device shown in FIG. 4, since the device does not have an automatic function of performing the target size determination, the operator himself or herself performs the size determination, and the radar display unit A high degree of skill is required for the visual confirmation method.

Although the radar apparatus shown in FIG. 5 has an automatic function of judging the size of a target, it requires a high resolution for obtaining a target area sufficiently accurately as described above. In order to achieve high azimuth resolution, it is necessary to increase the size of the antenna, such as the use of a large aperture antenna, and to secure the space required for the use of synthetic aperture processing. Therefore, not only the mobility of the radar apparatus is poor, but also it becomes extremely expensive.

(Object of the Invention) An object of the present invention is to solve the above-mentioned problems, and a target determination method and a radar with excellent mobility which can determine the size of a target without using a large aperture antenna. It is to provide a device.

Another object of the present invention is to provide a target determination method and a radar apparatus using a radar capable of determining the size of a target by a method as simple and inexpensive as possible.

[0016]

According to the present invention, there is provided a method for determining a target by using a radar, the method comprising the steps of: performing threshold determination on a reception amplitude of a reflected wave from a target; By doing so, each set of range bins in which the presence of the target is detected is obtained, and a distance for each target from each set, a target range that is a range of azimuthal direction is obtained from each set, and the target range with respect to the radar direction of the target is obtained from the target range. The length of the received echo Le, which is the length, is obtained, and the RCS (Radar Cross) is set for every range bin in which the presence of the target is detected based on the reception amplitude and the target distance.
Section), the maximum value σm of the RCS in the target range is detected, and the reception echo length Le and the RC
The size of the target is determined by referring to a database on the size of the target using the maximum value σm of S as the reception echo length Le and the maximum value σm of the RCS as parameters.

Further, in the target determination method, an integrated value σi of RCS is detected in addition to the maximum value σm of RCS in the target range, and the reception echo length Le, the RCS
The maximum value σm of the RCS and the integrated value σi of the RCS to determine the size of the target by referring to a database on the size of the target using the reception echo length Le, the maximum value σm of the RCS and the integrated value σi of the RCS as parameters. It is characterized by.

According to the radar apparatus of the present invention, the distance for each target is set from each set of range bins in which the presence of the target is detected by the threshold determination for the reception amplitude of the target reflected wave.
A target correlation processing unit for obtaining a target range which is a range of azimuthal spread, a reception echo length Le which is a length of the target in the radar direction from the target range, and a reception amplitude and a target distance signal of the target reflected wave. RCS (Radar Cross Section) is calculated for every range bin in which the presence of the target is detected, and the maximum value of RCS within the target range is detected.
CS calculation processing unit, the target correlation processing unit and the RCS
From the maximum value σm of the reception echo length Le and RCS from the arithmetic processing unit, the maximum value σ of the reception echo length Le and RCS
a target size determination unit that determines the size of the target by referring to a database on the size of the target using m as a parameter.

In the radar device, the RC
The S calculation processing unit also detects the integrated value σi of the RCS in addition to the detection of the maximum value of the RCS within the target range, and the target magnitude determination unit performs the processing based on the target correlation processing unit and the RCS calculation processing unit. The reception echo length Le, the maximum value σm of RCS
And the integrated value σi of RCS, the received echo lengths Le, R
The size of the target is determined by referring to a database on the size of the target using the maximum value σm of CS and the integrated value σi of RCS as parameters.

More specifically, in the radar apparatus (FIG. 1) according to the present invention, it is assumed that the target reception echo length Le and the reception echo length Le are positioned as one element for determining the size of the target. , Target detection unit (8 in FIG. 1)
Is a target correlation processing unit (FIG. 1) for obtaining a range bin range (target range) for each target from the distance and azimuth directions of a plurality of range bins that have detected the presence of the target.
9). Further, it has an RCS calculation processing unit (13 in FIG. 1) for obtaining the target RCS positioned as another element for determining the size of the target, and calculates the target size from the target reception echo length and the RCS. It has a target size determination unit (10 in FIG. 1) having a determination function. Further, in the radar apparatus (FIG. 2) of the present invention, an RCS maximum value-integral value calculation unit for obtaining an integral value of RCS positioned as yet another element for determining the magnitude of the target in addition to the target RCS. (17 in FIG. 2), and a target size determination unit (18 in FIG. 2) having a function of determining the size of the target from the target reception echo length, the maximum value of RCS, and the integrated value of RCS.

(Operation) A target range, which is the range in which each target exists and the spread in the cross-range direction, is determined from the threshold determination result for the target amplitude that can be measured by the radar device, and from the spread in the range direction, the target radar direction is calculated. The length of the received echo, which is the length, and the maximum value of the target RCS (and the integrated value of the RCS) are measured, and the measurement result and the maximum value of the received echo length and the RCS (and the integrated value of the RCS) corresponding to the target size are measured. The value is compared with a database to determine the magnitude of the target size. As an element for determining the size of the target, RCS is measured instead of precisely measuring the reception cross-range width to obtain the target area. It is not necessary to increase the azimuth resolution of the radar device, and it is not necessary to reduce the size of the antenna or the synthetic aperture processing.

[0022]

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

FIG. 1 is a block diagram relating to a radar target determination method and a radar apparatus according to one embodiment of the present invention. In FIG. 1, a transmitter 1, a transmission / reception switch 2, an antenna 3, a receiver 5, a signal processing unit 6, and a display 7
Are basically the same as the respective configurations of the radar apparatuses shown in FIGS. 4 and 5 described in relation to the conventional example, and therefore description thereof is omitted. Note that the target detection unit 8 of the present embodiment is different from the configuration of FIG. 5 in that it outputs a target amplitude signal that is target amplitude information in addition to the target detection signal.

The major difference between the present embodiment and the prior art is that the target area calculation unit 1 is included in the target correlation processing unit 9.
7 has a reception echo length calculation unit 12 instead of
An RCS calculation processing unit 1 for obtaining a target RCS
3 is provided. The target correlation processing unit 9 includes a target detection memory 11 and a reception echo length calculation unit 12, and the RCS calculation processing unit 13 includes an RCS calculation unit 14,
CS-target position memory 15 and RCS maximum value detector 16
Is provided.

Next, an outline of the function of each unit in the block diagram shown in FIG. 1 will be described. The target correlation processing unit 9 temporarily stores the target detection signal input from the target detection unit 8 in the target detection memory 11 in the same manner as the target correlation processing unit 9 shown in FIG. The target detection data of the distance and the azimuth adjacent to the target detection data are searched, and the adjacent target detection data are integrated into one target as target detection data from the same target. Then, from the target detection data distributed over the plurality of integrated range bins, the center distance Rm and the center azimuth θm, the number of range bins Ren of the reception echo length (Le), and the angle step of the reception cross range width (θc) are determined for each target. Find the number θcn (Rm,
The spread in the range direction and the cross range direction where the target specified by θm, Len, and θcn exists is referred to as “target range”.
). Then, the reception echo length calculation unit 12 calculates the reception echo length Le by the following equation, and calculates Rm, θm
Is output to the target size determination unit 10.

Le = (distance corresponding to one range bin) × Len (1) Since the radar apparatus of FIG. 1 has a high range resolution similarly to the radar apparatus of FIG. 5, the reception echo length Le is shown in FIG.
Data with the same level of accuracy as that of the radar system. However, the accuracy of the reception cross range width θc is lower than that measured by the radar device of FIG. 5 because the azimuth resolution accuracy is coarser than the target size. For example, since the azimuth resolution is coarse (that is, the transmission beam width is wide), even when a beam is transmitted in an azimuth where no target exists, the target is actually detected, and as a result, the target looks large in the azimuth direction. Possibilities arise. In particular, this effect becomes more pronounced as the target distance increases, and this tendency does not change even if the azimuth resolution of the radar is high. Therefore, in the present invention, instead of accurately obtaining the angle step number θcn of the reception cross range width θc and accurately measuring the target area, an RCS (Radar Cross Section) that is a target-specific value that does not change with distance is used. Focusing on measurement, an RCS calculation processing unit 13 is provided.

Next, an outline of the functions of the RCS processing unit 13 will be described in detail. In an actual target, the relationship between the attitude angle with respect to the radar and the RCS value is generally complicated, and a slight change in the attitude angle may cause a large change in the RCS value. It is considered that there is a problem in calculating only one RCS value and using it as a target size determination element. Therefore, in the present embodiment, in order to avoid that the RCS of the target having a large RCS value is actually measured small and to make the method of acquiring the RCS value of each target fair, the RCS calculation processing unit 13 is used. The RCS calculation unit 14 first calculates RCS values for all range bins determined to have a target, and then calculates the maximum value of RCS within the target range notified from the target correlation processing unit 9 to the RCS maximum value detection unit 16. , And the maximum value of the RCS is used as a target size determination element.

The target RCS value σ in the radar device is
Generally given by the following equation from the radar equation. σ = (4π) ³ · Pr · R ⁴ / (Pt · Gt · Gr · λ ² ) (2) where Pt: transmission power Gt: transmission antenna gain Gr: reception antenna gain λ: free space wavelength R: Target distance Here, Pt, Gt, Gr, and λ are known values specific to the radar device. Further, R and Pr are calculated from an angle signal, a range clock signal, a target detection signal, and a target amplitude signal obtained from the signal processing unit 6 and the target detection unit 8.

In determining the relative magnitude of the target, it is not always necessary to accurately determine the absolute value of RCS.
When determining the absolute magnitude of the target, it is necessary to increase the measurement accuracy of the RCS, and it is necessary to minimize the influence of reflected waves from other than the target. As a method for this, it is desirable to measure in advance the relationship between the distance and the received power for a target whose RCS is known in a typical operational terrain, and to hold this as calibration data.

As described above, the target RCS measurement is:
In the radar system, it is possible in principle to use the distance and the received power, which are the target measurement results, to obtain the radar system without increasing the scale of the system. Therefore, it is necessary to precisely measure the reception cross-range width (θc). There is an advantage that it can be realized at a lower cost than when performing.

The plurality of RCS values for one target obtained for each range bin by the RCS calculating section 14 are RCS
-It is temporarily stored in the target position memory 15 together with the target position (distance, direction).

Then, the RCS maximum value detecting section 16 calculates the RCS for the target range notified from the target correlation processing section 9.
Search the target position memory 15 to detect the maximum value of RCS for each target.

The target magnitude judging section 10 compares the target reception echo length Le obtained from the target correlation processing section 9 and the maximum value σm of the RCS obtained from the RCS calculation processing section 13 with the target Le and σm stored in advance. The size of the target is determined by comparing it with the size database, and the result is output to the display unit 7 together with the target distance R and the target direction θ.

Here, it is not possible to determine the magnitude of the target from only one of the target RCS and the received echo length. The reason for this is that, for example, in the case where a target having a shape as shown in FIG. 2A is measured, when the angle θa takes a value near 0 degrees in the same figure, the RCS may be measured small. It is considered that the target may actually be large in the range direction. Also, when the angle θa in FIG. 2A takes a value near 90 degrees, the reception echo length is measured to be small, but the target may actually be large in the cross range direction. In the display unit 7, in addition to the radar video, the determination result is symbolized and displayed on the target distance and the azimuth input from the target size determination unit 10, so that the operator can immediately determine the size of the target from the symbol. be able to.

(Description of Operation) Next, the operation of the radar apparatus of the present invention shown in FIG. 1 will be described with reference to FIGS. The transmitter 1, the transmission / reception switch 2, the antenna 3, the receiver 5, the signal processing unit 6, and the display 7 of FIG. 1 are the same as those of the respective components shown in FIG. ,
The only difference is that the target detector 8 also outputs a target amplitude signal that is target amplitude information. Hereinafter, the operation will be described focusing on the target correlation processing unit 9 and the RCS calculation processing unit 13 which are different from the conventional radar device.

The target detection memory 11 of the target correlation processing unit 9 stores a target detection signal (a signal indicating the presence or absence of a target) as a result of performing a threshold determination on the amplitude of the radar video signal from the target detection unit 8. Is input at the same time as the range clock signal and the angle signal input from the signal processing unit 6 in synchronization with the target detection signal, as shown in FIG. The target detection signal is temporarily held. The target correlation processing unit 9
Then, similarly to the target correlation processing unit 9 of the radar device of FIG.
By searching the target detection memory 11 for target detection data at a distance and an azimuth adjacent to a certain target detection data, a target range (a center distance Rm, a center azimuth θm, a range bin of a reception echo length) in which each target exists. The number Len and the number of angle steps θcn) of the reception cross range width are obtained, and the RCS
Output to the arithmetic processing unit 13.

In the reception echo length calculation section 12 of the target correlation processing section 9, the target reception echo length Le is calculated by the above-mentioned equation (1), and the target size determination section 10 is set together with the center distance Rm and the center azimuth θm. Output to

Next, the operation of the RCS processing unit 13 shown in FIG. 1 will be described. RCS of RCS operation processing unit 13
The calculation unit 14 receives a range clock signal and an angle signal from the signal processing unit 6 and a target detection signal and a target amplitude signal synchronized with the range clock signal and the like from the target detection unit 8. The RCS calculator 14 calculates the center distance Rm from the range clock signal and the received power Pr from the target amplitude signal, and calculates the RCS value for each range bin only from the above-described formula (2) only for the range bin in which the target is detected. I do. The obtained RCS value for each range bin is temporarily stored in the RCS-target position memory 15 as a buffer memory together with the range bin data (distance data) and the azimuth data.

The RCS maximum value detector 16 in the RCS processor 13 stores the RCS-target position memory 15 based on the target range (Rm, θm, Len, θcn) input from the target correlation processor 9. Maximum value of retained RCS σm
And outputs it to the target size determination unit 10 together with the center distance Rm and the center direction θm.

In the target size determination unit 10, the center distance R input from the target correlation processing unit 9 and the RCS calculation processing unit 13 is used.
m, the received echo length L in the same target range from the center azimuth θm
e is associated with the maximum value σm of the RCS, and a database on the target size, which uses Le and σm as parameters, stored in advance, is searched, and the reception echo length Le of the same target range and the maximum value σm of the RCS are searched. Is compared with the database to determine the magnitude. Here, as the processing of the magnitude determination, for example, the reception echo length Le and the maximum value σm of the RCS
For each of the threshold values, a threshold value is set in relation to the target size, and a comparison with the threshold value is performed to determine the magnitude of the target size corresponding to each threshold value. Selection can be possible). Then, the judgment result is the center distance Rm, the center direction θm
And outputs the same to the display unit 7.

In the display unit 7, in addition to the display of the radar video, the determination result input from the target size determination unit 10 is symbolized and displayed in the target direction and distance specified by the center distance Rm and the center azimuth θm. .

The operator can immediately determine the magnitude of the target from the radar video display and the symbol display of the predetermined target direction and distance.

(Other Embodiments) In the above embodiment,
Although the example in which the reception echo length Le and the maximum value σm of the RCS are used to determine the size of the target size is shown, in addition to the maximum value σm of the RCS, the integrated value of the RCS in the target range is also used in the size determination. Thereby, the determination accuracy can be improved, and the hardware scale can be further reduced.

FIG. 2 is a diagram showing another embodiment of the present invention as described above.
A configuration is provided in which an RCS maximum value-integral value calculation unit 17 is provided instead of the maximum value detection unit 16. 2, the RCS maximum value-integral value calculation unit 17 has a function of not only obtaining the maximum value of the RCS of the target range input from the target correlation processing unit 9 but also performing the integration process of the RCS of the target range. However, other configurations and functions are basically the same as those in the embodiment of FIG.

The integrated value σi of the RCS in the present embodiment
For example, as an integration method for calculating the RCS value in the range direction for each azimuth minimum step angle, a target RCS value having a certain spread in the azimuth and range directions is calculated.
First, the result of the value addition is obtained, and the RCS in the range direction is obtained.
A method such as multiplying a result of addition of a value by a certain multiplier and then adding the respective values can be used. Where the multiplier is
For example, it can be selected so that the azimuth away from the center of the target range becomes smaller.

As described above, in the target size determination section 18 of the present embodiment, not only the reception echo length Le and the maximum value σm of the RCS but also the integration result σi of the RCS obtained from the RCS maximum value-integral value calculation section 17 are obtained. This can be used as an element for determining the size. Here, the criterion in the database for size determination held in the target size determination unit 18 and the integration method (multiplier and the like) in the RCS maximum value-integration value calculation unit 17 are based on a typical target having a known size. It is desirable that the radar apparatus measures in advance and decides so as to obtain a desired determination result.

In the description of the embodiment of the present invention, only the case where the measurement of the target is limited to two-dimensional distance-azimuth has been described, but data can also be obtained in the elevation direction. In this case, it is needless to say that the target range may be obtained by extending the target range to three-dimensional distance-azimuth-elevation, and the maximum value of RCS and the integrated value of RCS may be obtained.

[0048]

As described above, in the present invention,
Since the RCS is measured instead of precisely measuring the reception cross-range width to obtain the target area as an element for determining the size of the target, it is not necessary to increase the azimuth resolution of the radar apparatus. Can be reduced in size and the synthetic aperture processing can be dispensed with, and it is possible to configure a small-sized and inexpensive radar device having excellent target mobility determination function with excellent mobility.

In addition to using the integrated value of the RCS in the target range in addition to the maximum value σm of the RCS to determine the magnitude, the accuracy of the determination is improved, the hardware scale can be further reduced, and an inexpensive radar is used. The device can be configured.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a radar target determination method and a radar apparatus according to the present invention.

FIG. 2 is a diagram for supplementarily explaining a target size determination according to the present embodiment.

FIG. 3 is a block diagram showing another embodiment of the radar target determination method and the radar device according to the present invention.

FIG. 4 is a block diagram showing a conventional radar device.

FIG. 5 is a block diagram showing another example of a conventional radar device.

FIG. 6 is a diagram for supplementarily explaining the target size determination in the radar device of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transmitter 2 Transmission / reception switch 3 Antenna 5 Receiver 6 Signal processing part 7 Display part 8, 21 Target detection part 9, 22 Target correlation processing part 10, 23 Target magnitude detection part 11 Target detection memory 12 Reception echo length (Le) Calculation unit 13 RCS calculation processing unit 14 RCS calculation unit 15 RCS-target position memory 16 RCS maximum value detection unit 17 RCS maximum value-integral value calculation unit 18 Target size determination unit 24 Target area calculation unit

Claims (4)

[Claims] 1. A target determination method by a radar for determining the size of a target, wherein each set of range bins in which the presence of the target is detected by performing a threshold determination on a reception amplitude of a reflected wave from the target. From each set, the distance for each target, the target range which is the range of the azimuthal direction is obtained from the set, and the reception echo length which is the length in the radar direction of the target is obtained from the target range, and the reception amplitude, The RCS (Radar Cross Section) is calculated for every range bin in which the presence of the target is detected based on the distance of the target, the maximum value of the RCS in the target range is detected, and the reception echo length and the maximum value of the RCS are detected. The received echo length and RC
A target determination method using a radar, wherein the target size is determined by referring to a database relating to a target size using the maximum value of S as a parameter. 2. A set of range bins in which the presence of a target is detected by performing a threshold determination on a reception amplitude of a reflected wave from the target in a target determination method using a radar for determining the size of the target. From each set, the distance for each target, the target range which is the range of the azimuthal direction is obtained from the set, and the reception echo length which is the length in the radar direction of the target is obtained from the target range, and the reception amplitude, RCS (Radar Cross Section) is calculated for every range bin in which the presence of the target is detected based on the target distance, the maximum value of RCS and the integrated value of RCS in the target range are detected, and the reception echo length, The maximum value of the RCS and the R
A target determination method using a radar, wherein the target size is determined by referring to a database relating to a target size using the reception echo length, the maximum value of RCS, and the integration value of RCS as parameters based on the integrated value of CS. 3. A target range which is a range of a distance and an azimuth spread for each target is obtained from each set of range bins in which the presence of the target is detected by threshold determination with respect to the reception amplitude of the target reflected wave. A target correlation processing unit for obtaining a reception echo length which is a length in the radar direction of the target from the target range; and a RCS for every range bin in which the presence of the target is detected based on the reception amplitude of the target reflected wave and the target distance signal.
(Radar Cross Section), an RCS calculation processing unit that detects the maximum value of RCS within the target range, and a maximum value of the reception echo length and RCS from the target correlation processing unit and the RCS calculation processing unit. , Received echo length and R
A radar device comprising: a target size determination unit that determines a target size by referring to a database on a target size using a maximum value of CS as a parameter. 4. The RCS calculation processing unit detects an integrated value of RCS in addition to a maximum value of RCS within the target range,
The target size determination unit includes the target correlation processing unit and the R
Based on the received echo length, the maximum value of RCS and the integrated value of RCS from the CS calculation processing unit, the target is referred to by referring to the database relating to the target size with the received echo length, the maximum value of RCS and the integrated value of RCS as parameters. 4. The radar device according to claim 3, wherein the magnitude of is determined.