JP4130419B2 - Radio transmitter / receiver - Google Patents

Description

  The present invention relates to a radio wave transmission / reception apparatus for performing radio wave interference, and more particularly to a technique for controlling transmission power of jamming radio waves.

  2. Description of the Related Art Conventionally, a radio wave transmission / reception device that is mounted on a mother body such as an aircraft or a ship and that conceals itself by blocking radio waves transmitted by a radio wave source such as a radar device is known. In general, such a radio wave transmission / reception device transmits a jamming radio wave with the maximum transmission power possible with the radio wave transmission / reception device, regardless of the distance to the radar device to be irradiated with the jamming radio wave or the radar system. .

  As one of such radio wave transmission / reception devices, a reception jamming device that transmits a pseudo jamming target radio wave (jamming wave) to a required target by analyzing the incoming radio wave and identifying the target is known (for example, , See Patent Document 1). The reception jamming apparatus includes a plurality of pseudo target generation circuits that generate a pseudo jamming target and a plurality of modulators that perform jamming modulation for each of the plurality of pseudo jamming targets. In addition, an azimuth correction control circuit that performs azimuth synchronization correction and a timing correction control circuit that performs timing synchronization correction are provided to approximate the movement of the pseudo-interference target to a true echo. According to this reception jamming apparatus, a plurality of modulators are arranged corresponding to a plurality of pseudo target generation circuits, and the jamming modulation mode can be changed for each pseudo jamming target according to target characteristics and jamming conditions. It is possible to improve the disturbance effect when the pseudo disturbance target is generated. Furthermore, since the azimuth correction control circuit and the timing correction control circuit are provided, the movement of the pseudo-jamming target becomes smooth and it becomes difficult to distinguish the pseudo-jamming target from the true echo, so that the deception effect can be improved. .

  In addition, as another technology for controlling transmission power, it is not a technology related to a radio wave transmission / reception device for performing radio interference, but transmission at the time of search of a tracking radar device according to distance information of a flight target acquired by a search radar device An anti-target radar system that controls electric power and searches for a flight target is known (see Patent Document 2). According to this anti-target radar system, conventionally, the tracking radar device always transmits and searches the maximum transmission power toward the flight target regardless of the target distance. In this case, it is possible to solve the problems that power is wasted and tracking radar devices are easily discovered.

Japanese Patent Laid-Open No. 9-270772 JP 2000-155166 A

  However, the conventional radio wave transmitter / receiver described above has a problem that power consumption and heat generation increase because the jamming radio wave is transmitted with the maximum transmission power. Moreover, since the jamming radio wave is transmitted with a large electric power, there is a problem that the secrecy of the radio wave is impaired. Furthermore, in the reception jamming device disclosed in Patent Document 1, it is necessary to know the contents of the processing performed on the radar device side, and the radar device that calculates the detection distance by the round trip time of the radio wave to the target, etc. Cannot be expected to be faithfully simulated, and the interference effect may not be obtained depending on the radar system employed in the target radar apparatus.

  The present invention has been made to solve the above-described problems, and is effective for radio wave sources that employ various radar systems while reducing power consumption and heat generation and improving radio wave confidentiality. An object of the present invention is to provide a radio wave transmitter / receiver capable of transmitting various jamming radio waves.

In order to achieve the above object, a radio transmission / reception device according to the present invention includes a receiving unit that receives radio waves from a radio source that is a disturbance target, reception power of radio waves received by the receiving unit, and transmission power of the radio source. The distance calculation unit that calculates the distance to the radio wave source based on the difference between the transmission power and the transmission power that calculates the minimum transmission power required to interfere with reception at the radio wave source present at the distance calculated by the distance calculation unit A calculation unit and a transmitter that transmits the jamming radio wave toward the radio wave source with the transmission power calculated by the transmission power calculation unit.
In addition, a modulation scheme determination unit that determines a modulation scheme in the radio wave source is further provided, and when the modulation scheme determined by the modulation scheme determination unit is a modulation scheme that implements fraud interference with a high degree of frequency matching, transmission power calculation The unit calculates a transmission power smaller than that in the case of a modulation scheme that implements power interference.

According to the present invention, since the jamming radio wave is transmitted with the minimum transmission power necessary to disturb the reception at the radio wave source based on the distance to the radio wave source, the power consumption and the heat generation amount are reduced. Can be made. In addition, since the interference radio wave is not transmitted with the maximum transmission power as in the prior art, the secrecy of the radio wave can be improved. Furthermore, since it is also effective for a radio wave source for which the detection distance is calculated based on the round trip time of the radio wave to the target, it is possible to transmit an effective interfering radio wave for a target employing various methods.
In addition, a modulation scheme determination unit that determines a modulation scheme in the radio wave source is further provided, and when the modulation scheme determined by the modulation scheme determination unit is a modulation scheme that implements fraud interference with a high degree of frequency matching, transmission power calculation Since the transmission unit calculates a transmission power smaller than that in the case of a modulation scheme that implements power interference, when performing fraudulent interference against a radio wave source from a certain distance, transmission power (low power consumption, low It is possible to obtain the same effect as electric power interference in terms of calorific value).

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Embodiment 1 FIG.
1 is a block diagram showing a configuration of a radio wave transmitting / receiving apparatus according to Embodiment 1 of the present invention. The radio wave transmission / reception apparatus includes a reception antenna 1, a receiver 2, a modulator 3, a transmitter 4, a transmission antenna 5, and a signal processor 6. The receiving unit of the present invention includes a receiving antenna 1 and a receiver 2. Further, the distance calculation unit and the transmission power calculation unit of the present invention are realized by the signal processor 6.

  The receiving antenna 1 receives a radio wave transmitted from a radio wave source (for example, a radar device) and converts it into an electric signal. An electric signal obtained by converting radio waves by the receiving antenna 1 is sent to the receiver 2.

  The receiver 2 generates a reception signal R by performing demodulation, frequency conversion, amplification, and the like on the electric signal transmitted from the reception antenna 1. The reception signal R generated by the receiver 2 is sent to the modulator 3. The receiver 2 detects the radio wave specifications and power of the received radio wave based on the generated reception signal R, and sends it to the signal processor 6 as detection data. Radio wave specifications include frequency, pulse width (PW), pulse repetition period (PRI), and the like.

  The modulator 3 generates a modulation signal RF, which is a low-power RF (Radio Frequency) signal, according to the modulation specifications MP set from the signal processor 6. The modulation specification MP includes a modulation scheme, a noise width when performing power disturbance, a deception distance when deceiving deception, deception speed, and the like. Specifically, the modulator 3 generates a modulation signal RF including noise having a noise width according to the modulation specifications when performing power interference, and from the receiver 2 when performing deception interference. Using the received signal R that is sent as a seed signal, a modulation signal RF for generating a pseudo interference target according to the modulation specification MP is generated. The modulation signal RF generated by the modulator 3 is sent to the transmitter 4. The modulator 3 constantly monitors the modulation signal RF sent to the transmitter 4. The monitor signal M1 obtained by this monitoring is sent to the signal processor 6.

  As shown in FIG. 2, the transmitter 4 includes an amplifier 40 and a monitor unit 41. The amplifier 40 amplifies the low-power modulation signal RF sent from the modulator 3 in accordance with the transmission control signal SC sent from the signal processor 6. The high power signal amplified by the amplifier 40 is sent to the transmission antenna 5 as a transmission signal T for radio wave interference. In addition, the monitor unit 41 constantly monitors the power of the transmission signal T (hereinafter referred to as “transmission power Tj”) sent from the amplifier 40 to the transmission antenna 5. The monitor signal M2 obtained by this monitoring is sent to the signal processor 6.

  The transmission antenna 5 converts the transmission signal T transmitted as an electrical signal from the transmitter 4 into a radio wave having a transmission power Tj and transmits it to the radio wave source.

  The signal processor 6 controls the entire radio transmission / reception apparatus. The processing performed by the signal processor 6 will be described in detail later with reference to a flowchart. The signal processor 6 includes an identification table 10 and a modulation table 11.

  As shown in FIG. 3, the identification table 10 stores radio wave specifications and transmission power of a plurality of radio wave sources (radar devices) targeted by the radio wave transmission / reception device for detection and radio wave interference. The radio wave specifications and transmission power stored in the identification table 10 are created based on information obtained by prior radio wave collection activities.

  As shown in FIG. 4, the modulation table 11 stores modulation specifications of a plurality of radio wave sources targeted by the radio wave transmitting / receiving apparatus for detection and radio wave interference.

  Next, the operation of the radio wave transmitting / receiving apparatus according to Embodiment 1 of the present invention configured as described above will be described with reference to the flowchart shown in FIG. To do.

  When the operation of the radio wave transmitting / receiving apparatus is started, first, detection data is acquired (step ST10). That is, the signal processor 6 acquires the detection data generated by the receiver 2 from the receiver 2 based on the radio wave received by the receiving antenna 1.

ここで、Ｌは減衰信号レベルであり、識別用テーブル１０に記憶されている電波源（探知データによって特定される）の送信電力から受信電波の電力を減算することにより求められる。また、ｆは探知データに含まれる受信電波の周波数［Ｈｚ］である。Ｃは光速（３×１０⁸ ［ｍ／ｓ］）である。 Next, the distance D to the radio wave source (target) is calculated (step ST11). That is, the signal processor 6 calculates the distance D to the radio wave source according to the following formula (1) derived from the radar equation based on the frequency and power (signal level) of the received radio wave included in the detection data.

Here, L is the attenuation signal level, and is obtained by subtracting the power of the received radio wave from the transmission power of the radio wave source (specified by the detection data) stored in the identification table 10. F is the frequency [Hz] of the received radio wave included in the detection data. C is the speed of light (3 × 10 ⁸ [m / s]).

  Next, modulation control is performed (step ST12). That is, the signal processor 6 selects the modulation parameters of the radio wave source specified by the detection data from the plurality of modulation parameters set in the modulation table 11 and sets them in the modulator 3. Thereby, the modulator 3 generates a modulation signal RF corresponding to the set modulation specification MP and sends it to the transmitter 4. Next, it is checked whether or not the monitor signal M1 is valid (step ST13). That is, the signal processor 6 inspects the monitor signal M1 from the modulator 3 to check whether the modulation signal RF is modulated so as to have the characteristics indicated by the modulation specification MP.

  If it is determined in step ST13 that the monitor signal M1 is not valid, the sequence returns to step ST12, and feedback control is performed so that a modulation signal RF corresponding to the modulation specification MP is obtained. Thereafter, steps ST12 and ST13 are repeatedly executed. In the course of this repeated execution, if it is determined in step ST13 that the monitor signal M1 is valid, transmission control shown in step ST14 and subsequent steps is executed.

ここで、Ａｏは受信アンテナ１の有効面積、Ｇｏは送信アンテナ５の利得、ｆは受信電波の周波数、Ｔｓは電波源１０１の送信電力、Ｄは電波送受信装置の搭載母体１０２と電波源１０１との間の距離、σは搭載母体１０２が電波を反射する実効面積である。 In the transmission control, first, as shown in FIG. 6, a radio wave having power (hereinafter referred to as “transmission power Ts”) transmitted from the radio wave source 101 is reflected by the base body 102 of the radio wave transmission / reception device and is transmitted. The power of the received radio wave (hereinafter referred to as “reception power Rs”) at the time of reception is calculated (step ST14). This received power Rs is calculated according to the radar equation shown in the following formula (2).

Here, Ao is the effective area of the receiving antenna 1, Go is the gain of the transmitting antenna 5, f is the frequency of the received radio wave, Ts is the transmission power of the radio wave source 101, D is the base body 102 and the radio wave source 101 of the radio wave transmitting / receiving device. , Σ is an effective area where the mounting matrix 102 reflects radio waves.

  Next, the JS ratio is determined (step ST15). The JS ratio is the received power Rs of the radio wave received by the radio wave source 101 and the power of the jammed radio wave (hereinafter referred to as “reception” when the radio wave source 101 receives the jamming radio wave transmitted from the base body 102 of the radio wave transmitting / receiving device. Ratio Rj / Rs). When the JS ratio is equal to or greater than a predetermined value, the interference effect in the radio wave source 101 is exhibited. The received power Rj can be calculated from the transmission power Tj and the frequency f transmitted by the known radio wave transmitting / receiving apparatus and the distance D between the radio wave source 101 and the mounting base 102 using the above-described equation (1).

  Next, the transmission power Tj is calculated (step ST16). That is, the signal processor 6 calculates the minimum transmission power Tj necessary for realizing the reception power Rj that satisfies the JS ratio determined in step ST15.

  Next, transmission control is performed (step ST17). That is, the signal processor 6 generates a transmission control signal SC for obtaining the transmission power Tj calculated in step ST16 and sends it to the amplifier 40 of the transmitter 4. The amplifier 40 amplifies the modulation signal RF sent from the modulator 3 in accordance with the transmission control signal SC, generates a high-power transmission signal T, and sends it to the transmission antenna 5. Thereby, the jamming radio wave is transmitted toward the radio wave source with the transmission power Tj.

  Next, it is checked whether or not the monitor signal M2 is valid (step ST18). That is, the signal processor 6 checks the monitor signal M2 from the transmitter 4 and checks whether or not the transmission signal T is amplified so as to have the transmission power Tj indicated by the transmission control signal SC.

  If it is determined in step ST18 that the monitor signal M2 is not valid, the sequence returns to step ST17, and feedback control is performed so that a transmission signal T having a transmission power Tj corresponding to the transmission control signal SC is obtained. . Thereafter, steps ST17 and ST18 are repeatedly executed. During this repeated execution, if it is determined in step ST18 that the monitor signal M2 is valid, the process ends. The process shown in the flowchart of FIG. 5 is repeated at a constant cycle. As a result, it is possible to perform radio interference according to surrounding conditions that change from moment to moment.

  The radio wave of the radio wave source (radar apparatus) 101 is attenuated in proportion to the fourth power of the distance, and the interference radio wave is attenuated in proportion to the second power of the distance. The transmission power Tj required to obtain the ratio is small.

  As described above, according to the radio wave transmission / reception apparatus according to Embodiment 1 of the present invention, the minimum transmission power Tj necessary for realizing the JS ratio effective for radio wave interference is transmitted to the radio wave source to generate radio waves. Since interference is performed, power consumption and heat generation can be reduced. In addition, since the interference radio wave is not transmitted with the maximum transmission power as in the prior art, the secrecy of the radio wave can be improved. Furthermore, since it is also effective for a device that calculates the detection distance based on the round-trip time of the radio wave to the target, it is possible to transmit an effective jamming radio wave for a target that employs various methods.

  In addition, according to the radio wave transmitting / receiving apparatus according to the first embodiment, the power to be input when mounted on a mother body having a low margin of supply power or a mother body having no cooling capacity for the discharged heat is used. In addition, the heat to be discharged can be minimized.

Embodiment 2. FIG.
The radio wave transmission / reception apparatus according to Embodiment 2 of the present invention changes the transmission power in accordance with the type of radio wave interference to be implemented.

  The configuration of the radio wave transmitting / receiving apparatus according to the second embodiment is the same as that of the radio wave transmitting / receiving apparatus according to the first embodiment shown in FIG.

  Next, the operation of the radio wave transmitting / receiving apparatus according to the second embodiment of the present invention will be described with reference to the flowchart shown in FIG. The same parts as those in the first embodiment shown in the flowchart of FIG.

  When the operation of the radio wave transmitting / receiving apparatus is started, first, detection data is acquired (step ST10). Next, the distance D to the radio wave source (target) is calculated (step ST11). Next, modulation control is performed (step ST12). Next, it is checked whether or not the monitor signal M1 is valid (step ST13). If it is determined in step ST13 that the monitor signal M1 is not valid, the sequence returns to step ST12, and feedback control is performed so that the modulation signal RF corresponding to the modulation specifications is generated. Thereafter, steps ST12 and ST13 are repeatedly executed. In the course of this repeated execution, if it is determined in step ST13 that the monitor signal M1 is valid, transmission control shown in step ST14 and subsequent steps is executed.

  In the transmission control, first, the received power Rs when the radio wave having the transmission power Ts transmitted from the radio wave source 101 is reflected by the base body 102 of the radio wave transmitting / receiving apparatus and received by the radio wave source 101 is expressed by the above equation (2). (Step ST14).

  Next, the specifications of the radio wave transmitted from the radio wave source 101 are checked (step ST20). The signal processor 6 determines a modulation method to be performed on the radio wave source 101 specified by the detection data with reference to the modulation table 11. If it is determined in step ST20 that the modulation scheme is for implementing power interference, a relatively large value α (α> 1) is determined as the JS ratio (step ST21). On the other hand, when it is determined in step ST20 that the modulation scheme is for implementing deception interference, a value β (β> 1) smaller than the value α is determined as the JS ratio (step ST22).

  Next, the transmission power Tj is calculated (step ST16). In this case, the transmission power Tj when performing fraud interference is smaller than the transmission power Tj when performing power interference. Next, transmission control is performed (step ST17). As a result, as shown in FIG. 8, the jamming radio wave is transmitted from the mounting base 102 of the radio wave transmitting / receiving device toward the radio wave source 101 with the transmission power Tj for power jamming or the transmission power Tj for fraud jamming.

  Next, it is checked whether or not the monitor signal M2 is valid (step ST18). If it is determined in step ST18 that the monitor signal M2 is not valid, the sequence returns to step ST17, and feedback control is performed so that a transmission signal T having a transmission power Tj corresponding to the transmission control signal SC is obtained. . Thereafter, steps ST17 and ST18 are repeatedly executed. During this repeated execution, if it is determined in step ST18 that the monitor signal M2 is valid, the process ends. The process shown in the flowchart in the figure is repeated at a constant cycle. As a result, it is possible to perform radio interference according to surrounding conditions that change from moment to moment.

  As described above, according to the radio wave transmission / reception device according to the second embodiment of the present invention, the power jamming or the fraud jamming is carried out according to the modulation method, so the fraud jamming against the radio wave source is carried out from a certain distance. In this case, it is possible to obtain an effect equivalent to that of power interference with less transmission power than power interference, that is, low power consumption and low heat generation. This is because fraudulent interference generates a modulated signal using the signal itself received from the radio wave source as a seed signal, so that the frequency matching degree is higher than that of power interference, and a sufficient interference effect can be obtained even if the JS ratio is small. Because it can.

Embodiment 3 FIG.
The radio wave transmitting / receiving apparatus according to Embodiment 3 of the present invention changes the JS ratio according to the direction of arrival of radio waves, specifically, the elevation angle when the mounting base of the radio wave transmitting / receiving apparatus is viewed from the radio wave source. It is.

  FIG. 9 is a block diagram showing a configuration of a radio wave transmitting / receiving apparatus according to Embodiment 3 of the present invention. This radio wave transmitting / receiving apparatus includes two receiving antennas such as a first receiving antenna 1a and a second receiving antenna 1b arranged at a predetermined distance, and the receiver 2 and the signal processor 6 are connected to the receiver 2 ′. And the signal processor 6 ′ are different from the radio wave transmitting / receiving apparatus according to the first embodiment in that the signal processor 6 ′ is changed. The modulation system determination unit of the present invention is composed of a signal processor 6 '.

  The receiving antenna 1a receives a radio wave transmitted from a radio wave source (for example, a radar device) and converts it into an electric signal. An electric signal obtained by converting radio waves by the receiving antenna 1a is sent to the receiver 2 '. Similarly, the receiving antenna 1b receives a radio wave transmitted from a radio wave source and converts it into an electric signal. An electric signal obtained by converting radio waves by the receiving antenna 1b is sent to the receiver 2 '.

  The receiver 2 ′ performs demodulation, frequency conversion, amplification, and the like on the electric signal transmitted from the first reception antenna 1 a to generate a first reception signal. In addition, the receiver 2 'performs demodulation, frequency conversion, amplification, and the like on the electrical signal transmitted from the second receiving antenna 1b to generate a second received signal. Either the first reception signal or the second reception signal generated by the receiver 2 ′ is sent to the modulator 3 as a reception signal R.

  Further, the receiver 2 'detects the radio wave specifications and power based on the generated first reception signal or second reception signal, and sends it to the signal processor 6' as detection data. Further, the receiver 2 ′ detects the arrival direction of the radio wave based on the generated first reception signal and second reception signal and sends it to the signal processor 6 ′. More specifically, the receiver 2 ′ calculates an elevation angle φ when the radio wave source 101 is viewed from the mounting base body 102 of the radio wave transmission / reception device as the radio wave arrival direction, and sends the elevation angle φ to the signal processor 6 ′.

  Next, the operation of the radio wave transmitting / receiving apparatus according to the third embodiment of the present invention will be described with reference to the flowchart shown in FIG. 10, focusing on the processing executed by the signal processor 6 '. The same parts as those in the first embodiment shown in the flowchart of FIG.

  When the operation of the radio wave transmitting / receiving apparatus is started, first, detection data is acquired (step ST10). Next, the distance D to the radio wave source (target) is calculated (step ST11). Next, modulation control is performed (step ST12). Next, it is checked whether or not the monitor signal M1 is valid (step ST13). If it is determined in step ST13 that the monitor signal M1 is not valid, the sequence returns to step ST12, and feedback control is performed so that the modulation signal RF corresponding to the modulation specifications is generated. Thereafter, steps ST12 and ST13 are repeatedly executed. During this repeated execution, if it is determined in step ST13 that the monitor signal M1 is valid, transmission control shown in step ST14 and subsequent steps is performed.

  In the transmission control, first, the received power Rs when the radio wave having the transmission power Ts transmitted from the radio wave source 101 is reflected by the base body 102 of the radio wave transmitting / receiving apparatus and received by the radio wave source 101 is expressed by the above equation (2). (Step ST14).

  Next, based on the elevation angle φ when the mounting base body 102 of the radio wave transmitting / receiving apparatus is viewed from the radio wave source 101, the effective area σ for reflecting the radio waves of the mounting base body 102 is calculated (step ST30). As shown in FIG. 11, in the case of a small elevation angle φ1, the effective area σ is also small, and the effective area σ increases as the elevation angle φ2 increases.

  Next, the JS ratio is determined according to the effective area σ that reflects radio waves (step ST31). That is, the JS ratio is determined to be large when the effective area σ is small, and the JS ratio is small when the effective area σ is large.

  Next, the transmission power Tj is calculated (step ST16). That is, the signal processor 6 calculates the minimum transmission power Tj necessary for realizing the reception power Rj that satisfies the JS ratio determined in step ST31. As shown in Expression (2), when the effective area σ is small, the transmission power Tj is small in the reception power Rs, so the JS ratio is large, and a small transmission power Tj is calculated. On the other hand, when the effective area σ is large, the reception power Rs is also large, so the JS ratio is small, and a large transmission power Tj is calculated.

  Next, transmission control is performed (step ST17). Next, it is checked whether or not the monitor signal M2 is valid (step ST18). If it is determined in step ST18 that the monitor signal M2 is not valid, the sequence returns to step ST17, and feedback control is performed so that a transmission signal T having a transmission power Tj corresponding to the transmission control signal SC is obtained. . Thereafter, steps ST17 and ST18 are repeatedly executed. During this repeated execution, if it is determined in step ST18 that the monitor signal M2 is normal, the process ends. The process shown in the flowchart of FIG. 10 is repeated at a constant cycle. As a result, it is possible to perform radio interference according to surrounding conditions that change from moment to moment.

  As described above, according to the radio wave transmission / reception apparatus according to Embodiment 3 of the present invention, the effective area σ for reflecting radio waves according to the elevation angle when the radio wave transmission / reception apparatus mounting base body 102 is viewed from the radio wave source 101 is set. Since it is calculated, the magnitude of the effective area σ in the radar equation can be calculated more accurately. As a result, it is possible to transmit radio waves with more accurate transmission power Tj.

It is a block diagram which shows the structure of the electromagnetic wave transmission / reception apparatus which concerns on Embodiment 1 of this invention. It is a block diagram which shows the detailed structure of the transmitter shown in FIG. It is a figure which shows an example of the table for identification used with the electromagnetic wave transmission / reception apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows an example of the table for a modulation | alteration used with the electromagnetic wave transmission / reception apparatus which concerns on Embodiment 1 of this invention. It is a flowchart for demonstrating operation | movement of the electromagnetic wave transmission / reception apparatus which concerns on Embodiment 1 of this invention. It is a figure for demonstrating operation | movement of the electromagnetic wave transmission / reception apparatus which concerns on Embodiment 1 of this invention. It is a flowchart for demonstrating operation | movement of the electromagnetic wave transmission / reception apparatus which concerns on Embodiment 2 of this invention. It is a figure for demonstrating operation | movement of the electromagnetic wave transmission / reception apparatus which concerns on Embodiment 2 of this invention. It is a block diagram which shows the structure of the electromagnetic wave transmission / reception apparatus which concerns on Embodiment 3 of this invention. It is a flowchart for demonstrating operation | movement of the electromagnetic wave transmission / reception apparatus which concerns on Embodiment 3 of this invention. It is a figure for demonstrating operation | movement of the electromagnetic wave transmission / reception apparatus which concerns on Embodiment 3 of this invention.

Explanation of symbols

  1, 1a, 1b receiving antenna, 2, 2 'receiver, 3 modulator, 4 transmitter, 5 transmitting antenna, 6, 6' signal processor, 40 amplifier, 41 monitor unit.

Claims (2)

A receiver for receiving radio waves from a radio source to be disturbed;
A distance calculation unit that calculates a distance to the radio wave source based on a difference between the reception power of the radio wave received by the reception unit and the transmission power of the radio wave source;
A transmission power calculation unit that calculates the minimum transmission power necessary to interfere with reception at the radio wave source existing at the distance calculated by the distance calculation unit;
In the radio wave transmitting / receiving apparatus comprising: a transmitter that transmits the jamming radio wave toward the radio wave source with the transmission power calculated by the transmission power calculating unit ;
Further comprising a modulation method determination unit for determining a modulation method in the radio wave source;
The transmission power calculation unit, when the modulation scheme determined by the modulation scheme determination unit is a modulation scheme that implements fraud interference with a high frequency matching degree, the transmission power is smaller than the modulation scheme that implements power interference calculate
A radio wave transmitting / receiving apparatus characterized by The receiver further detects the direction of arrival of the radio wave transmitted from the radio wave source,
The transmission power calculation unit calculates an effective area for reflecting the radio wave based on the arrival direction of the radio wave detected by the reception unit, and in order to prevent reception at the radio wave source in consideration of the calculated effective area The radio transmission / reception apparatus according to claim 1, wherein a necessary minimum transmission power is calculated.

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