JPH10268033A - Radio wave interference device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continue an effective interference effect, even if a missile approaches. SOLUTION: The distance information of a missile is inputted to an operator 20 via a remote control receiver 19 of a radio wave interference shot. In this case, a distance with J(an interference wave)/S(a radar reflection wave) being equal to 1 is calculated, and the output of a pulse generation circuit 15 is switched to a continuous wave when the distance is reached, thus performing continuous wave interference. An HOJ (home on jamming) that is an interference source tracking function that the missile has is induced by the continuous wave interferene, thus an effective interference effect is continued, even if J/S is equal or less than 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio wave jamming device that jams or deceives a radio guided missile (hereinafter, referred to as a missile) that poses a threat to radar bases, surface ships, and the like.

[0002]

2. Description of the Related Art In order to avoid missile attacks on radar bases and surface ships, a type of radio wave jamming device that jams or deceives missiles is launched from a launch tube and is used in the air by parachutes or hovering rockets. There is a radio wave jamming device that emits jamming radio waves while floating on the sea. The operation of such a radio interference device will be described with reference to FIG. 1 in the figure
Is a missile, 2 is a radio wave jammer, 3 is a radio wave detector that detects the radio wave of the missile 1, 4 is a radar device that detects and tracks the missile 1, and 5 is a remote controller that remotely controls the radio wave jammer 2 after launch Reference numeral 6 denotes a launch tube for projecting the radio wave jamming bullet 2 to a distant place, and reference numeral 7 denotes a control panel for launching and controlling the radio wave jamming beam 2.

In the conventional radio wave detection device, the radio wave detection device 3 detects the radio wave of the missile 1, and the missile 1 is tracked by the radar device 4, and based on the information, the radio wave from the launch tube 6 is determined by the operator. Injects obstruction bullet 2. After reaching the predetermined altitude, the emitted radio wave jamming bomb 2 floats in the air with a parachute, a hovering rocket, or the like, and transmits a jamming wave toward the missile 1. The remote controller 5 transmits information such as the flying azimuth and frequency of the missile 1 to the floating radio wave jamming bomb 2. The radio jamming bomb 2 transmits the jamming and deceiving radio waves in the designated direction and frequency designated by the remote controller 5 so that the tracking center of the missile 1 can be moved from the radar base or the target of the surface ship to the radio wave jamming bomb. Transfer to
It protects radar bases and surface ships.

FIG. 6 is a block diagram showing a conventional radio jamming bullet. In the figure, 8 is an amplifier for amplifying a received signal, 9 is a mixer, 10 is a frequency memory, 11 is a power amplifier for amplifying a transmitted wave, 12 is a directional coupler, 13 is a transmitting / receiving antenna, 14 is a local oscillator, 15 Is a pulse generation circuit.

[0005] In a conventional radio wave jammer, a radio wave from the missile 1 is input from the transmission / reception antenna 13 to the amplifier 8 via the directional coupler 12. By mixing the output signal of the amplifier 8 and the local signal of the local oscillator 14 with the mixer 9, an intermediate frequency is extracted and input to the frequency memory 10. The frequency memory 10 can store this intermediate frequency and output it at a required timing. The output signal of the frequency memory 10 is converted into the same frequency as the original missile transmission frequency by mixing with the local signal of the local oscillator 14 by the mixer 9. Thereafter, the jamming radio wave is transmitted from the antenna 13 to the missile 1 via the power amplifier 11. Here, the output signals of the frequency memory 10 and the power amplifier 11 are subjected to predetermined pulse modulation by the pulse generation circuit 15 to hinder the tracking of the missile 1.
Form a radio wave to deceive.

[0006]

SUMMARY OF THE INVENTION A radio jammer is used as a decoy from a remote location to avoid missiles flying toward radar bases and surface ships.
It is a device that transmits deceptive radio waves. The problem of such a radio wave jamming device will be described with reference to FIG. In FIG. 7A, reference numeral 16 denotes a missile radar receiver, and reference numeral 17 denotes a target such as a radar base or a surface ship. When a radio wave detection device or a radar device installed at a radar base or the like detects that a missile has flew, it will emit a radio wave jamming
Transmit deceptive radio waves. Here, the missile receives the jamming and deceiving radio waves from the radio jamming bullet and the tracking center shifts to the radio jamming bullet, so that the missile's flight path deviates from the target. In this way, radar bases and surface ships can be defended. Here, the missile radar receiver 16 is receiving two signals. One is that the radar wave transmitted by the missile itself is the target 1
7 is a radar reflected wave S that has been reflected, and the other is an interfering wave J from an electric wave jamming bomb. The relationship between the received power and the distance is obtained by the following equation, as is well known.

[0007]

(Equation 1)

[0008] Here, Ptr is the transmission power of the radar, Pt
j is the transmission power of the jammer, Gr is the antenna gain of the radar, Gj is the antenna gain of the jammer, σ is the radar effective reflection area of the target, λ is the wavelength, and R is the distance between the target and the missile. . FIG. 7B shows the relationship between the received power of the missile and the distance obtained from the above equation. As is apparent from this equation, the radar reflected wave S is 1 / R ⁴ and the interfering wave J is 1 / R 4.
^The received power changes along ² . In a distance range shorter than the distance where J / S = 1, the interfering wave J is lower than the radar reflected wave S, and it is difficult to cause the missile to track and transfer. As an example, Ptr = 77d
Bm, Ptj = 43 dBm, Gr = 30 dB, Gj = 2
If 0 dB, σ = 46 dBm ² , and λ = 17-17.3 dB, the distance R at which J / S = 1 is about 9 km. Here, assuming that the jamming is started by the radio wave jamming when the missile reaches about 20 km, the effect of the jamming is lost from a distance within about 9 km. In this way, despite the fact that the jamming bullets continue to transmit jamming radio waves,
There was a problem that the obstruction effect was not exhibited within about 1/2 of the missile handling distance.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem. Even when a missile approaches a distance where J / S = 1, the jamming transmission of the radio wave jamming is continued. While it is in effect, it is intended to ensure that the effective jamming effect continues. Generally, recent missiles receive continuous wave jamming, and as a countermeasure, Homon
It has a guiding function called Jamming (hereinafter referred to as HOJ). The HOJ is a function that operates when a missile receiver receives radio waves having a certain power or more, so as to perform angle tracking with respect to the interference source. For such a missile with a HOJ function, the jamming radio wave itself becomes an induction signal, so that the jamming radio wave cannot be transmitted carelessly. However, the radio wave jamming device described in the present invention can actively induce HOJ by transmitting radio waves from a remote place as a "decoy".

[0010]

According to a first aspect of the present invention, there is provided a radio wave jamming device which transmits a distance information to a missile detected by a radar base or a surface ship to a radio wave jamming device by a remote control radio wave.
When the distance at which S = 1 is reached, the modulation mode of the pulse generation circuit is switched from pulse modulation to continuous wave, thereby positively inducing HOJ of the missile.

[0011] Further, the radio wave jamming device according to the second invention is characterized in that:
A timer circuit that counts the elapsed time of operation is provided for radio jamming bombs,
At the time when it is estimated that J / S = 1 has been reached, the pulse generation circuit is switched to a continuous wave, thereby similarly inducing HOJ.

Further, the radio wave jamming device according to the third invention is
A computer is installed at the radar base and on the surface of the ship to control radio wave jamming, and J / S is calculated based on the missile distance information obtained by the radar system.
= 1 is calculated, the output is transmitted to a radio wave jammer via a remote controller, and a continuous wave is switched in the same manner as above to induce HOJ.

Further, the radio wave jamming device according to the fourth invention is
Input the radio wave data such as the transmission frequency, pulse width, pulse repetition frequency, etc. of the missile obtained by the radio wave detection device to the above computer, automatically identify the type of missile, and the most effective jamming / deception of radio jamming bombs The control is performed to further induce HOJ.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a block diagram of a radio wave jammer showing a first embodiment of the present invention. Reference numerals 8 to 15 are exactly the same as those of the above-mentioned conventional device, and reference numeral 18 denotes a remote control receiving antenna.
9 is a remote control receiver, and 20 is an arithmetic unit.

[0015] In the radio jamming bullet configured as described above,
The operator identifies from the experience and knowledge based on the radio wave detection device of the radar base and the surface ship and the information of the missile detected by the radar device, and transmits the distance information of the missile by remote control radio wave. This remote control radio wave is transmitted to the remote control receiving antenna 18.
, And is input to the remote control receiver 19 to obtain the transmission frequency, the output power, the antenna gain, the distance information, etc., which are specific to the missile, from time to time. These pieces of information are input from the remote control receiver 19 to the arithmetic unit 20, and the distance at which J / S = 1 is calculated from the above-described equation. On the other hand, the timing at which the modulation of the jamming radio wave is switched from the pulse modulation to the continuous wave is a time when the distance information of the missile transmitted from time to time by the remote control radio wave reaches the distance obtained above. The level at which the missile induces HOJ is shown in FIG. As shown in the figure,
Since the HOJ induction level is exceeded at a distance farther than the distance where J / S = 1, the missile induces the HOJ from the point of time when the disturbance wave is switched to the continuous wave.

Embodiment 2 FIG. 2 is a block diagram of a radio-jamming bullet showing a second embodiment of the present invention. Numerals 8 to 15 are exactly the same as those of the above-mentioned conventional device, and 21 is a timer circuit.

In the first embodiment, the disturbance is switched to the continuous wave based on the specific data of the missile and the distance information. In this embodiment, the operation elapsed time from the launch is counted by the timer circuit 21 and J / S When the time estimating that = 1 has elapsed, a trigger signal is transmitted to the pulse generation circuit 15 to switch the modulation of the interference wave to a continuous wave. In this embodiment, it is necessary to obtain information such as the speed and the distance of the missile before launching the jamming bullet, and set the time of the timer circuit in advance. It is not necessary to add a device, and a reduction in size and weight can be achieved.

Embodiment 3 FIG. 3 is a diagram of a radio wave jamming device according to a third embodiment of the present invention. Numerals 3 to 7 are exactly the same as those of the above-mentioned conventional device, and numeral 22 is a computer.

In the first embodiment and the second embodiment, the arithmetic unit and the timer circuit are provided inside the radio wave jamming bullet. In the third embodiment, however, the computer 22 is provided on the radar base or the surface ship side.
And calculates the distance J / S = 1 from the distance and speed of the missile detected and tracked by the radar device, and sends the information to switch the jamming of the jamming beam to continuous wave via the remote controller. Is to be transmitted. In this embodiment, there is no need to add a new circuit to the jammer,
This method has little impact on changes in flight characteristics due to an increase in the size and mass of a conventional jamming bullet or a shift in the position of the center of gravity.

Embodiment 4 FIG. 4 is a diagram of a radio wave jamming device according to a fourth embodiment of the present invention. Numerals 3 to 7 and 22 are exactly the same as those of the conventional device, and numeral 23 is a computer database.

In the third embodiment, a computer is installed at a radar base or a surface ship, and the distance at which J / S = 1 is calculated. In this embodiment, the computer 22 has a radar device 4 and a radio wave detection device. Data of the detected missiles such as distance, speed, azimuth, radio wave data, etc. are input and collated with a database 23 prepared in advance to automatically identify the type of the missile. In the conventional apparatus, the most suitable interference technique relied on the experience and knowledge of the operator, but according to the present invention, information on the characteristics of the missile (for example, information indicating the relationship between the speed, the transmission frequency and the type of the missile) And effective jamming methods (for example, jamming frequency, PRF, pulse width, etc. corresponding to the type of missile) are stored as a database, so that effective jamming techniques are automatically obtained without the intervention of an operator and controlled automatically. I can do it.

[0022]

According to the first aspect of the invention, the radio wave information and the distance information of the missile are transmitted by the remote control radio wave, and the distance provided by the arithmetic unit provided inside the radio wave jamming becomes J / S = 1. Is calculated, and when this distance is reached, the modulation of the interference wave is switched to a continuous wave, so that the HOJ is induced in the missile, and the effective interference effect can be continued.

According to the second aspect of the present invention, a timer circuit is provided inside the radio wave jamming body to measure a time estimated to have reached J / S = 1, and at this time, the jamming wave is converted into a continuous wave. By switching, a similar effect is obtained.

According to the third aspect of the present invention, a computer is provided at a radar base or a surface ship, and the distance at which J / S = 1 is obtained from the distance and speed of the missile detected and tracked by the radar apparatus, and the remote control is performed. The information for switching the jamming wave of the radio wave jamming wave to the continuous wave is transmitted by the device, and a similar jamming effect is obtained.

According to the fourth aspect of the present invention, the type of the missile is identified by inputting the distance and the radio wave data of the missile detected by the radar device and the radio wave detection device to the computer, and collating the missile type with a database prepared in advance. Then, the same jamming effect is obtained by transmitting the optimum jamming method to the radio jamming bullet via the remote controller.

[Brief description of the drawings]

FIG. 1 is a first embodiment of a radio wave jamming device according to the present invention;
FIG.

FIG. 2 is a second embodiment of the radio wave jamming device according to the present invention;
FIG.

FIG. 3 is a third embodiment of the radio wave jamming device according to the present invention;
FIG.

FIG. 4 is a fourth embodiment of a radio wave jamming device according to the present invention;
FIG.

FIG. 5 is a diagram illustrating the operation of a conventional radio wave jamming device.

FIG. 6 is a block diagram of a conventional radio jammer.

FIG. 7 is a diagram illustrating a problem of a conventional radio wave jamming device.

[Explanation of symbols]

1 missile, 2 jammer, 3 radio detector, 4
Radar device, 5 remote controller, 6 launch cylinder, 7 control panel, 8 amplifier, 9 mixer, 10 frequency memory, 1
1 power amplifier, 12 directional coupler, 13 transmitting / receiving antenna, 14 local oscillator, 15 pulse generating circuit,
16 radar receiver, 17 target, 18 remote control receiving antenna, 19 remote control receiver, 20 arithmetic unit, 2
1 Timer circuit, 22 computer, 23 database.

Claims (4)

[Claims] 1. A remote control receiver for receiving a radio guided missile distance information or the like inside a radio wave jamming missile, wherein the radio wave jamming missile is suspended in the air and interferes with the radio guided missile. And an arithmetic unit for inputting the distance information and the like to perform an operation necessary for controlling the interference wave, and a pulse generating circuit for switching the modulation to a continuous wave by an output signal of the arithmetic unit. apparatus. 2. A device for suspending a radio wave jammer in the air against a radio guided missile and interfering with the radio wave missile, wherein a timer circuit for counting an operation elapsed time from the emission of the radio wave jammer is provided inside the radio wave jammer. A pulse generating circuit for switching the modulation to a continuous wave according to an output signal of the timer circuit. 3. A radio wave detecting device for detecting radio waves of a radio guided missile, a radar device for detecting the distance and speed of the missile, and inputting output information of the radar device to control a radio-jam. And a control panel for inputting output information of the computer and the output information of the radio wave detection device to control radio wave jamming. 4. A computer for inputting the output information of the radar device and the output information of the radio wave detection device, respectively, and controls the radio wave jamming by collating with a database in which the types of missiles possessed by the computer and the jamming method are stored. Perform the necessary calculations for
The radio wave jamming device according to claim 3, further comprising a control panel for controlling a radio wave jamming bullet with the output information.