JP2000019241A - Radar device and beam control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make extendable the maximum detection distance in a short reaction time by detecting the arrival direction of an interference wave by an auxiliary reception antenna or the like, and by concentrating, in a beam, a transmission wave where a specified control has been made in an arrival direction. SOLUTION: The radar device being operated under electronic interference (ECM) environment is provided with an exclusive auxiliary reception antenna 10 for reception that has a covered region being identical to the azimuth and elevation covered region of the radar device. Then, an interference wave received by the antenna 10 is amplified by an ECM receiver 11, and the information on the interference wave including an arrival direction or the like is detected by an interference-wave direction detection circuit 12 or the like. Based on the detection result, a beam controller A13 controls a transmission pulse generator 2 for controlling the integration value of a transmission pulse and the like, and a transmission beam being radiated from a fused array antenna 1 is directed to an interference direction. The interference wave may be received by the antenna 1, and an ESM azimuth search device may be used. Also, the beam control method can be applied to a device using a rotary-type antenna.

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 a beam control method in an electronic interference environment.

[0002]

2. Description of the Related Art In a radar, an electronic interference (ECM) for a transmission frequency thereof is used.
inter Measures) is a major obstacle to target detection. On the other hand, the radar operator directs the beam by focusing on the target by instructing the beam directing direction (BTD: Burn Through Detect).
The maximum detection distance of the target existing during the electronic disturbance (hereinafter referred to as a burn-through range (Bur
n (Through Range)).

In a general radar, the received power S from a target is
The relationship between n and the distance R to the target at that time is represented by the following equation (1).

[0004]

(Equation 1)

On the other hand, when an interfering wave from an interfering device existing in the same direction as a target is received by a radar, the interfering received power J is expressed by equation (2).

[0006]

(Equation 2)

Therefore, Sn / J is given by the following equation (3).

[0008]

(Equation 3)

In the above equations, Ptr: radar transmission power Br: radar reception bandwidth Ptj: jammer transmission power Bj: jammer radio wave bandwidth Gr: radar antenna gain Rj: radar and jammer Gj: Antenna gain of jammer σ: Target effective reflection area I (n): Integral gain at the time of integration number n λ: Wavelength of radar transmission wave Grj: Antenna gain in direction of jammer.

At this time, the burn-through range RB
Is as follows.

[0011]

(Equation 4)

However, in the above equation (4), (S /
J) min is the minimum detection S / N (signal to noise ratio) required for target detection.

Here, the integral number is set to m (n
<M), the burn-through range RB ′ is
It can be shown by equation (5).

[0014]

(Equation 5)

Here, I (n) <I (m). Therefore, Expression (6) is obtained from Expressions (4) and (5).

[0016]

(Equation 6)

From the above equation (6), the burn-through range can be extended by the beam concentration due to the increase of the integral number.

FIG. 13 shows “Radar technology” (supervised by Takashi Yoshida,
2 shows a functional system of a radar apparatus provided with a phased array antenna described in the Institute of Electronics, Communication and Communication Engineers of Japan. In FIG. 1, a phased array antenna 1 radiates a radar transmission radio wave into space, and this antenna receives a reflected wave from a target. The transmission pulse generator 2 generates a radar transmission seed signal, and the receiver 3
The signal received by the above antenna is amplified and detected.

A target detector 4 detects a target on the basis of the received signal detected by the receiver 3, and a radar indicator 5 allows the radar operator to visually recognize the detected target and a radar beam. This is for giving a control instruction. The beam controller 6 controls the beam directing direction of the phased array antenna 1 according to the above-described beam control instruction, and controls the integral number of the transmission signal by controlling the integral number control circuit A (30). . Note that reference numeral 7 denotes a target to be detected, and reference numerals 8 and 9 denote ESMs (described later) and ECMs of a jammer that hinders detection of the target 7, respectively.

The radar device having such a configuration irradiates a beam in the direction in which the target 7 exists by setting the beam directing direction of the phased array antenna 1 in accordance with the beam management by the beam controller 6. Further, the radar device can detect the position information of the target 7 by receiving the reflected wave from the target 7.

[0021]

However, in the above-mentioned radar apparatus, an ESM (Electronic Support) is provided in the main lobe direction where the target 7 exists.
Measurement), a radar wave analyzer called E.
CM (Electronic CounterMeas)
ure), a phased array antenna 1
The ESM 8 detects a transmission radio wave radiated from the ESM 8 and analyzes a frequency, a modulation method, and the like of the transmission radio wave. And EC
When an interference wave equivalent to the transmission radio wave is emitted from M9, this makes it difficult for the radar apparatus to detect the target 7, so that the maximum detection distance of the target is reduced.

On the other hand, the radar operator confirms the direction of arrival of the interfering wave on the radar indicator 5, and instructs the radar indicator 5 to direct the beam in order to concentrate the beam in the direction of the interfering wave. To instruct. According to this instruction information, the beam controller 6 directs the beam in the direction of arrival of the interfering wave and increases the integral number, thereby extending the burn-through range. However, this stretching requires a manual operation by a radar operator, and has a problem that the reaction time is reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to automatically control the beam directing direction in the direction of arrival of an interfering wave without the intervention of a radar operator. An object of the present invention is to provide a radar apparatus and a beam control method capable of performing beam concentration without reducing time and extending a burn-through range for a target existing in the direction of arrival of an interfering wave.

[0024]

In order to achieve the above object, the present invention provides a radar apparatus for detecting the position of a target based on a reflected wave from the target. And a first antenna for receiving the reflected wave, a second antenna for receiving an interference wave for the radio wave, and a direction of arrival based on the interference wave received by the second antenna. Detecting means for detecting, control means for performing predetermined control on a transmission pulse, beam forming means for forming a beam according to the control result, and directivity for directing the beam in the direction of arrival by the first antenna. Means, wherein the directing means provides a radar apparatus for concentrating a beam in the arrival direction according to the control result.

Preferably, the control means controls an integral number of the transmission pulse. Further, the integration number of the transmission pulse is adjusted according to the reception level of the interference wave. Further, the control means increases the pulse width of the transmission pulse according to the reception level of the interference wave, and the beam forming means increases the average power of the beam with the increase of the pulse width. .

According to another aspect of the present invention, the first antenna receives the interfering wave instead of the second antenna. The first antenna is a phased array antenna. The first antenna is a rotary antenna that outputs predetermined antenna orientation information.

According to another aspect of the present invention, the second antenna and the detecting means are replaced by an ESM direction finding device, and the directing means is arranged to detect the direction of the interfering wave from the ESM direction finding device. The beam is directed.

According to another aspect of the present invention, there is provided a beam control method used in a radar apparatus for detecting a position of a target based on a reflected wave from the target. First for receiving the reflected wave
Controlling the second antenna for receiving an interference wave with respect to the radio wave, and detecting the arrival direction based on the interference wave received by the second antenna. A control step of performing predetermined control on a transmission pulse; a beam forming step of forming a beam according to a control result of the transmission pulse; and a directivity of directing the beam in the arrival direction by the first antenna. A beam control method for converging a beam in the arrival direction according to the control result.

Preferably, the control step controls an integral number of the transmission pulse. Further, the integration number of the transmission pulse is adjusted according to the reception level of the interference wave. Preferably, the control step increases a pulse width of the transmission pulse according to a reception level of the interference wave, and the beam forming step increases an average power of the beam with an increase in the pulse width. .

[0030]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Embodiment 1 FIG. FIG. 1 is a block diagram showing a system of the radar device according to Embodiment 1 of the present invention. In the figure, the same components as those of the conventional radar device shown in FIG. 13 are denoted by the same reference numerals, and the description thereof will be omitted.

In the radar apparatus shown in FIG. 1, the auxiliary reception antenna 10 is a reception-only antenna having a coverage area equivalent to the azimuth and elevation coverage areas of the radar apparatus, and an interference wave arriving from outside the radar apparatus. To receive. ECM receiver 11
Amplifies the interference wave received by the auxiliary receiving antenna 10. Further, the interference wave direction detection circuit 12 detects the arrival direction of the interference wave received by the auxiliary reception antenna 10 by a method described later, and sends the detection result to the beam controller A (13). The beam controller A (13) controls the transmission pulse generator 2 based on the detection result from the interference wave direction detection circuit 12, and radiates from the phased array antenna 1 in the interference direction. Directs the beam of the transmitted radio wave.

In the radar apparatus according to the present embodiment, first, the beam controller A (13) switches the transmitter 2 to the non-transmission state, and determines that the apparatus itself is in a state capable of receiving the interference wave. The direction detection circuit 12 is notified. As described above, the interference wave received by the auxiliary receiving antenna 10 is the ECM
Since the signal is amplified by the receiver 11, a received signal having a predetermined level corresponding to the received wave is input to the interference wave direction detection circuit 12.

FIG. 2 is a diagram showing the signal level of the reception signal amplified by the ECM receiver 11 with respect to the auxiliary reception antenna azimuth. When the signal amplified by the ECM receiver 11 exceeds a preset threshold value as shown in FIG. 10, the interference wave direction detection circuit 12 recognizes the signal as an interference wave.

The interference wave direction detection circuit 12 determines the beam direction θ of the auxiliary reception antenna 10 at this time, that is,
The arrival direction of the interference wave is notified to the beam controller A (13). Therefore, the integral number control circuit A (30) controls the integral number under the control of the beam controller A (13). Then, the beam controller A (13) controls the beam directing direction of the phased array antenna 1 to the arrival direction of the interfering wave, and switches the transmission pulse generator 2 to the transmission state. At this time, the beam controller A (13) controls the integration number of the transmission pulse generated from the transmission pulse generator 2, and
Focus the beam in the direction of arrival of the jammer. The control of the integral number here will be described later.

FIG. 3 is a flowchart showing an outline of a control procedure in the radar apparatus according to the present embodiment. In step S1 of the figure, reception control, that is, control in which the ECM receiver 11 receives the signal through the auxiliary reception antenna 10, amplifies the output interference wave, and inputs the received signal to the interference wave direction detection circuit 12 I do.

In step S2, the interference wave direction detection circuit 1
Approval of the disturbance by 2 is performed. That is, the ECM receiver 1
As described above, it is determined whether the signal amplified in step 1 has a reception level equal to or higher than a certain level. If the determination in step S2 is YES, it is determined that the arriving wave is an interference wave (step S3), and in step S4, under the control of the beam controller A (13), the integration number control circuit A (3
Control of the integral number according to 0) is performed.

In step S5, control of the beam directing direction for the phased array antenna 1 (control of the antenna beam in the direction of arrival of the interfering wave) and
The control for switching the transmitter 2 to the transmission state is performed, and the beam is concentrated in the arrival direction of the interference wave.

However, in step S2, if the received signal has not reached the predetermined reception level, it is determined that the arriving wave is not an interfering wave (step S6), and the process is terminated.

FIG. 11 is a diagram for explaining a transmission pulse control method in the radar apparatus according to the present embodiment, and is a block diagram particularly showing an internal configuration of the integral number control circuit A. The control of the integral number is the control of the transmission timing for the transmission pulse generator 2, and in the present embodiment,
The integration number control circuit A (30) executes the “normal mode” and the “BT
It operates in two modes of "D mode" to control the integral number. Specifically, the normal mode is set when no interference wave is received, and the BTD mode is set when an interference wave is received.

As shown in FIG. 11, the integration number control circuit A
(30) is the transmission timing data (the integral number is n) 30a of the normal mode as the transmission timing in advance,
BTD mode transmission timing data (integral number is m) 3
0b is stored. In addition, the integral number control circuit A (30)
The transmission timing control circuit 30c incorporated in the controller receives a mode switching timing signal from the beam controller A (13), and reads any of the transmission timing data according to the signal. Then, the transmission timing control circuit 30c sends the read transmission timing data to the transmission pulse generator 2, and the transmission pulse generator 2 generates a transmission pulse according to the data.

As described above, according to the present embodiment, the direction of arrival of an interference wave is detected, and based on the result,
The beam controller increases the integration number of the transmission pulse and directs and concentrates the beam in the direction of arrival of the interference wave, thereby extending the burn-through range with respect to the target.

Further, since the manual operation by the radar operator is not required for the extension, the reaction time in the radar operation can be greatly reduced as compared with the conventional manual method.

Embodiment 2 Hereinafter, a radar device according to Embodiment 2 of the present invention will be described. FIG. 4 is a block diagram illustrating a system of the radar device according to the present embodiment. In the figure, the same components as those of the radar device according to the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted here.

In the radar apparatus according to the present embodiment, the integration number is controlled according to the level of the reception level of the interference wave, thereby increasing the target detection capability. In FIG. 4, the interference wave level / direction detection circuit 14 detects that the reception signal received by the auxiliary reception antenna 10 and amplified by the ECM receiver 11 exceeds a preset threshold.
It is recognized as an interference wave, and the reception level of the interference wave at this time is notified to the integral number control circuit B (15).

At the same time, the interference wave level / direction detection circuit 14
Is the beam pointing direction at the auxiliary receiving antenna 10, that is,
The arrival direction of the interference wave is notified to the beam controller A (13). Therefore, as described below, the integration number control circuit B (15) receives the control of the beam controller A (13) and obtains the interference wave from the preset integration number corresponding to the interference wave level. Control the number of integration according to the reception level of.

The beam controller A (13) controls the beam directing direction of the phased array antenna 1 to the arrival direction of the interference wave, switches the transmission pulse generator 2 to the transmission state, and sets the arrival direction of the interference wave. Focus the beam on the

FIG. 12 is a block diagram showing an internal configuration of the integral number control circuit B for describing a method of controlling a transmission pulse in the radar device according to the present embodiment. Also in the present embodiment, the integration number control circuit B (15) operates in two modes, a "normal mode" when no interfering wave is received and a "BTD mode" when an interfering wave is received. , Control of the integral number.

As shown in FIG. 12, the integral number control circuit B
(15) is transmission timing data (the integral number is n) 15a in the normal mode as transmission timing in advance,
It stores a BTD mode transmission timing data table 15b. The transmission timing data table 15b in the BTD mode has transmission timing data 1 (integration number m1) to transmission timing data k (integration number mk) corresponding to reception levels 1 to k.

The integration number control circuit B (15) has a built-in transmission timing control circuit 15c, which
A mode switching timing signal is received from (13). At the same time, the transmission timing control circuit 15c receives the notification of the interference wave reception level from the interference wave level / direction detection circuit 14 as described above. Then, the transmission timing control circuit 15c reads any of the transmission timing data according to the timing signal and the interference wave reception level.

As a result, the transmission timing control circuit 15c
Sends the read transmission timing data to the transmission pulse generator 2, and the transmission pulse generator 2 generates a transmission pulse according to the data.

As described above, in the present embodiment, by controlling the integration number in accordance with the reception level of the interference wave, it is possible to perform radar resource management for concentrating the beam more where the level of the interference wave is large. Becomes

Embodiment 3 FIG. Hereinafter, a radar device according to Embodiment 3 of the present invention will be described. FIG. 5 is a block diagram illustrating a system of the radar device according to the present embodiment. In the figure, the same components as those of the radar device according to the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted here.

In the apparatus according to the present embodiment, unlike Embodiments 1 and 2, the pulse width is increased according to the reception level of the interfering wave, instead of the beam concentration due to the increase in the number of integration, and the transmission average is increased. The beam is concentrated by increasing the power.

That is, in the radar device shown in FIG. 5, the interference wave level / direction detection circuit 14 notifies the beam controller A (13) of the beam directing direction (direction of arrival of the interference wave) in the auxiliary receiving antenna 10. Then, the beam controller A (13) receives the notification and controls the pulse width control circuit 16 to increase the pulse width according to the reception level of the interference wave.

Thereafter, the beam controller A (13) controls the beam directing direction of the phased array antenna 1 to the arrival direction of the interference wave, switches the transmission pulse generator 2 to the transmission state, and sets the arrival direction of the interference wave. Focus the beam on the

As described above, according to the present embodiment, the pulse width is increased according to the reception level of the interference wave, the transmission average power is increased, and the beam concentration is performed. Radar resource management that focuses the beam on places where the distance is large is possible.

Embodiment 4 FIG. Hereinafter, a radar device according to Embodiment 4 of the present invention will be described. FIG. 6 is a block diagram showing a system of the radar apparatus according to the present embodiment, and the same components as those of the radar apparatus according to the first embodiment shown in FIG. Therefore, the description thereof is omitted here.

The antenna in the first to third embodiments is the phased array antenna 1, whereas the radar device shown in FIG. 6 uses a rotary antenna 17.
In the device according to the present embodiment, first, the beam controller B
(18) switches the transmitter 40 to the non-transmission state, and notifies the interference wave direction detection circuit 12 that the apparatus is in a state capable of receiving the interference wave.

The interference wave received by the auxiliary receiving antenna 10 is amplified by the ECM receiver 11. When the amplified received signal exceeds a preset threshold, the interference wave direction detection circuit 12 recognizes the signal as an interference wave. Then, the interference wave direction detection circuit 12 notifies the beam controller B (18) of the beam directing direction (direction of arrival of the interference wave) of the auxiliary reception antenna 10 at this time.

On the other hand, the antenna direction detecting circuit 19 receives a signal (antenna direction information) from the rotary antenna 17 and
The direction is detected, and the result is used as the beam controller B (1).
Send to 8). Then, upon receiving the above notification, the beam controller B (18) switches the transmitter 40 to the transmission state, and when the antenna azimuth information from the antenna azimuth detection circuit 19 matches the arrival direction of the interfering wave, the integral number Control circuit A (3
The beam is controlled by the integral number set in advance by 0), and the beam is concentrated in the arrival direction of the interference wave.

The control of the integral number here is performed by the beam controller B (18) controlling the integral number of the transmission pulse generated from a transmission pulse generator (not shown) inside the transmitter.

As described above, according to the present embodiment, even when the antenna of the radar apparatus is a rotary antenna other than the phased array antenna, the integration number is controlled in accordance with the reception level of the interfering wave. Thereby, the beam can be more concentrated on the place where the level of the interference wave is large.

Embodiment 5 FIG. Hereinafter, a radar device according to Embodiment 5 of the present invention will be described. FIG. 7 is a block diagram illustrating a system of the radar device according to the present embodiment. In the figure, the same components as those of the radar apparatus according to Embodiment 1 shown in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted here.

The radar apparatus according to the present embodiment shown in FIG. 7 differs from the above embodiments in that the phased array antenna 1 is used instead of the auxiliary reception antenna 10 and the ECM receiver 11 Instead, the receiver 3 is used. In the figure, a beam controller A (13)
Switches the transmission pulse generator 2 to the non-transmission state, and notifies the interference wave direction detection circuit 12 that the device itself is in a state capable of receiving the interference wave.

On the other hand, the signal received by the phased array antenna 1 is amplified by the receiver 3 as described above.
When the received signal exceeds a preset threshold, the interference signal direction detection circuit 12 identifies the received signal as an interference signal, and determines the beam direction of the phased array antenna 1 (that is, the arrival direction of the interference signal) at this time. Notify the beam controller A (13).

The beam controller A (13) receiving this notification
Indicates the beam directing direction of the phased array antenna 1,
It controls the direction of arrival of the interfering wave,
Is switched to the transmission state. At this time, the beam controller A
(13) is similar to the first embodiment and the like, by controlling the integral number by the integral number control circuit A (30),
Focus the beam in the direction of arrival of the jammer.

As described above, in the present embodiment, a phased array antenna is used instead of the auxiliary receiving antenna,
In addition, by adopting a configuration using the antenna receiver instead of the ECM receiver, the circuit configuration of the device can be simplified.

Embodiment 6 FIG. Hereinafter, a radar device according to Embodiment 6 of the present invention will be described. FIG. 8 is a block diagram illustrating a system of the radar device according to the present embodiment. In the same figure, the same components as those of the radar apparatus according to Embodiment 4 shown in FIG. 6 are denoted by the same reference numerals, and the description thereof is omitted here.

The radar device according to the present embodiment shown in FIG. 8 is different from the device according to the fourth embodiment shown in FIG. 6 in that a rotary antenna 17 is used instead of the auxiliary receiving antenna 10.
This is an example in which the receiver 3 is used instead of the ECM receiver 11. Also in the device shown in FIG. 12, the beam controller B (18) switches the transmitter 40 to the non-transmission state,
The device itself notifies the interference wave direction detection circuit 12 that the interference wave can be received.

The signal received by the phased array antenna 1 serving as an auxiliary receiving antenna is
Amplified by If the received signal exceeds a preset threshold, the interference wave direction detection circuit 12 identifies the signal as an interference wave, and the beam direction of the phased array antenna 1 at this time (the arrival direction of the interference wave).
To the beam controller B (18).

The beam controller B (18) receiving this notification
Indicates the beam directing direction of the phased array antenna 1,
Control is performed in the direction of arrival of the interference wave, and the transmitter 40 is switched to the transmission state. Also at this time, the beam controller B (18)
Is an integral number control circuit A (3
By controlling 0), the integral number is controlled to concentrate the beam in the direction of arrival of the interfering wave.

As described above, also in the present embodiment, a phased array antenna is used instead of the auxiliary receiving antenna, and the receiver of this phased array antenna is used instead of the ECM receiver. Can be simplified.

Embodiment 7 Hereinafter, a radar device according to Embodiment 7 of the present invention will be described. FIG. 9 is a block diagram showing a system of the radar device according to the present embodiment. In the figure, the same components as those of the radar device according to the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted here.

The device according to the present embodiment shown in FIG.
In the apparatus according to the first embodiment, the auxiliary reception antenna 10, the ECM receiver 11, and the interference wave direction detection circuit 1
2 is a radar device using an ESM direction finding device 20 used in combination with the radar device.

The ESM direction finding device 20 shown in FIG. 9 detects the same function as the ESM 8 of the other party, that is, the direction of arrival of the interfering wave. The ESM direction finding device 20 notifies the beam controller A (13) of the detection result of the direction of arrival of the interfering wave, so that the beam controller A (13) changes the beam directing direction of the phased array antenna 1. , And controls the transmission direction of the transmission pulse generator 2 to a transmission state. At this time, the beam controller A (13) concentrates the beam in the arrival direction of the interfering wave by controlling the integral number by the integral number control circuit A (30), as in the first embodiment and the like.

By adopting such a configuration, that is, a configuration in which the auxiliary reception antenna, the ECM receiver, and the interference wave direction detection circuit are not incorporated, the radar apparatus according to the present embodiment has a very simple configuration. Thus, the beam can be concentrated in the direction of arrival of the interfering wave.

Embodiment 8 FIG. Hereinafter, a radar device according to Embodiment 8 of the present invention will be described. FIG. 10 is a block diagram showing a system of the radar device according to the present embodiment. In the figure, the same components as those of the radar device according to the fourth embodiment shown in FIG. 6 are denoted by the same reference numerals, and the description thereof will be omitted.

The device according to the present embodiment shown in FIG. 10 is different from the device according to the fourth embodiment in that a radar device is used instead of the auxiliary reception antenna 10, the ECM receiver 11, and the interference wave direction detection circuit 12. This is a radar device using the ESM direction finding device 20 used in combination with.

The ESM direction finding device 20 shown in FIG. 10 also detects the direction of arrival of the interference wave, and notifies the beam controller B (18) of the detection result of the direction of arrival of the interference wave, similarly to the ESM 8 of the other party. On the other hand, the antenna azimuth detecting circuit 19 receives a signal (antenna azimuth information) from the rotary antenna 17, detects the azimuth, and outputs the result to the beam controller B (18).
Send to

The beam controller B (1) receiving the above notification
8) Switching the transmitter 40 to the transmission state, and controlling the integral number control circuit A (30) in advance when the antenna direction information from the antenna direction detection circuit 19 coincides with the arrival direction of the interfering wave. The beam is controlled by the set integration number, and the beam is concentrated in the arrival direction of the interference wave.

Here, as in the fourth embodiment, the integral number is controlled by beam controller B (18) by the integral number of transmission pulses generated by a transmission pulse generator (not shown) inside the transmitter. Is performed by controlling.

As described above, by adopting a configuration in which the auxiliary reception antenna, the ECM receiver, and the interference wave direction detection circuit are not incorporated, the radar apparatus according to the present embodiment has a very simple Beam can be concentrated in the direction of arrival.

[0083]

As described above, according to the present invention,
By performing a predetermined control on the transmission pulse, forming a beam according to the control result, directing the beam in the direction of arrival of the interference wave, and concentrating the beam in the direction of arrival according to the control result, The target burn-through range can be extended even in an electronic interference environment. Further, since the beam directing direction can be controlled in the direction of arrival of the interfering wave without the intervention of a radar operator, the reaction time can be reduced as compared with the conventional manual control.

According to another aspect of the invention, by controlling the integration number according to the reception level of the interference wave, radar resource management according to the level of the interference wave becomes possible. Also, by controlling the pulse width according to the reception level of the interference wave, it is possible to perform radar resource management according to the level of the interference wave.

Also, when a rotary antenna is used as an antenna instead of a phased array antenna,
The beam can be concentrated more where the level of the interference wave is large.

Further, according to another aspect of the present invention, the second antenna and the detecting means are replaced with an ESM direction finding device, and the directing portion directs the beam based on the direction information of the interference wave from the ESM direction finding device. By doing so, the configuration of the device can be greatly simplified.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a system of a radar device according to Embodiment 1 of the present invention.

FIG. 2 is a diagram showing a reception signal level with respect to an auxiliary reception antenna azimuth;

FIG. 3 is a flowchart showing an outline of a control procedure in the radar device according to the first embodiment.

FIG. 4 is a block diagram showing a system of a radar device according to a second embodiment.

FIG. 5 is a block diagram showing a system of a radar device according to a third embodiment.

FIG. 6 is a block diagram showing a system of a radar device according to a fourth embodiment.

FIG. 7 is a block diagram showing a system of a radar device according to a fifth embodiment.

FIG. 8 is a block diagram showing a system of a radar device according to a sixth embodiment.

FIG. 9 is a block diagram showing a system of a radar device according to a seventh embodiment.

FIG. 10 is a block diagram showing a system of a radar device according to an eighth embodiment.

FIG. 11 is a block diagram showing an internal configuration of an integral number control circuit A of the radar device according to the first embodiment.

FIG. 12 is a block diagram showing an internal configuration of an integral number control circuit B of the radar device according to the second embodiment.

FIG. 13 is a diagram illustrating a functional system of a conventional radar device including a phased array antenna.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Phased array antenna, 2 ... Transmission pulse generator, 3 ... Receiver, 4 ... Target detector, 5 ... Radar indicator,
6: Beam controller, 7: Target, 8: ESM, 9: EC
M, 10: auxiliary receiving antenna, 11: ECM receiver, 12
... interference wave direction detection circuit, 13 ... beam controller A, 14 ...
Interference wave level / direction detection circuit, 15: integration number control circuit B, 16: pulse control circuit, 17: rotary antenna, 1
8: Beam controller B, 19: Antenna direction detection circuit, 2
0: ESM direction finding device, 30: integral number control circuit A, 40 ...
Transmitter

Claims (12)

[Claims] 1. A radar device for detecting a position of a target based on a reflected wave from the target, comprising: a first antenna for irradiating a predetermined radio wave to the target and receiving the reflected wave; A second antenna for receiving an interfering wave with respect to the radio wave, detecting means for detecting the direction of arrival based on the interfering wave received by the second antenna, and control means for performing predetermined control on the transmission pulse And a beam forming means for forming a beam according to the control result; and a directing means for directing the beam in the direction of arrival by the first antenna, wherein the directing means responds to the control result. A radar apparatus, wherein a beam is concentrated in the arrival direction. 2. The radar apparatus according to claim 1, wherein said control means controls an integral number of said transmission pulse. 3. The radar apparatus according to claim 2, wherein an integral number of the transmission pulse is adjusted according to a reception level of the interference wave. 4. The control unit increases the pulse width of the transmission pulse according to the reception level of the interference wave, and the beam forming unit reduces the average power of the beam with the increase in the pulse width. 2. The method according to claim 1, wherein the number is increased.
The described radar device. 5. The radar device according to claim 1, wherein the first antenna receives the interfering wave instead of the second antenna. 6. The radar device according to claim 1, wherein the first antenna is a phased array antenna. 7. The radar device according to claim 1, wherein the first antenna is a rotary antenna that outputs predetermined antenna orientation information. 8. The method according to claim 8, wherein said second antenna and said detecting means are E
Replaced with a SM direction finding device, and the pointing means is the ESM
8. The radar device according to claim 6, wherein the beam is directed based on direction information of the interfering wave from a direction finding device. 9. A beam control method for use in a radar apparatus for detecting a position of a target based on a reflected wave from the target, wherein the target is irradiated with a predetermined radio wave and the reflected wave is received. Controlling a first antenna for receiving an interference wave with respect to the radio wave, controlling a second antenna for receiving an interference wave with respect to the radio wave, A detection step of detecting a direction; a control step of performing predetermined control on a transmission pulse; a beam formation step of forming a beam according to a control result of the transmission pulse; and the first antenna A beam directing step of directing a beam, wherein the directing step focuses the beam in the arrival direction according to the control result. 10. The beam control method according to claim 9, wherein said control step controls an integral number of said transmission pulse. 11. The beam control method according to claim 10, wherein an integral number of the transmission pulse is adjusted according to a reception level of the interference wave. 12. The control step increases a pulse width of the transmission pulse according to a reception level of the interference wave, and the beam forming step reduces an average power of the beam with the increase of the pulse width. 10. The beam control method according to claim 9, wherein the number is increased.