CN108418650B - Multichannel multi-band interference signal generator - Google Patents
Multichannel multi-band interference signal generator Download PDFInfo
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- CN108418650B CN108418650B CN201810218635.7A CN201810218635A CN108418650B CN 108418650 B CN108418650 B CN 108418650B CN 201810218635 A CN201810218635 A CN 201810218635A CN 108418650 B CN108418650 B CN 108418650B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K1/00—Secret communication
- H04K1/003—Secret communication by varying carrier frequency at or within predetermined or random intervals
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Abstract
The invention relates to a multichannel multi-band interference signal generator, which consists of a sawtooth wave generating circuit and a frequency modulation circuit, and is characterized in that the sawtooth wave generating circuit mainly consists of a 555 trigger, a PNP (plug-and-play) triode, an NPN triode I, an NPN triode II and a protection resistor; the frequency modulation circuit mainly comprises three voltage-controlled oscillators, the sawtooth wave output ends are respectively connected with the control ends of the voltage-controlled oscillators, the voltage-controlled oscillators are respectively provided with a modulating circuit with bandwidth and a central frequency point, and the central frequency points of the three-way modulating circuit are respectively 1.6GHz, 2.4GHz and 5.75GHz. Since the wide-band frequency modulation wave has the same amplitude in the time domain, no drastic change of the amplitude exists, and thus the power margin of the amplifier is effectively utilized. On the frequency domain, the frequency domain is continuously swept within the bandwidth, each frequency point is uniformly covered, the amplitude of each spectral line is basically equal, and the amplitude difference is not more than 1dB.
Description
Technical Field
The invention relates to the technical signal jammer field, in particular to a multichannel multiband interference signal generator.
Background
With the rapid development of information technology, information battle has become an important battle action throughout the whole process of high-technology battle, and an information system such as communication, navigation and the like is interfered by using an electronic countermeasure, so that the information system is an important content of electronic battle in the information battle. The enhancement of the capability of military radio communication and navigation system against enemy electromagnetic interference has become a key for improving the capability of communication navigation guarantee, and in order to conveniently implement radio communication countermeasure training in daily training and exercise, the capability of equipment and operators against enemy electromagnetic interference is improved, so that a low-power electronic interference system aiming at communication countermeasure training is necessary to be developed.
The interference signal generation scheme generally adopts a comb spectrum interference scheme and a continuous spectrum blocking interference scheme. The comb-shaped blocking type interference is frequently adopted, and the blocking is the interference, and a common implementation method is that a plurality of oscillation sources are arranged in one interference machine, and after addition synthesis, multi-channel interference is sent out from one broadband antenna. But the added and synthesized input end is connected to the power amplifier, which is a complex frequency modulation and amplitude modulation wave. From the complex amplitude modulation characteristic, the power capacity utilization rate of the power amplifier is reduced to be very low. When the input of the power amplifier is a constant amplitude wave with single frequency, the constant amplitude wave is amplified, and the full power is output as the corresponding output voltage. When the input of the power amplifier is a plurality of equal-amplitude wave signals with the same amplitude but different frequencies, all the equal-amplitude wave signals are in phase at a moment, namely all the equal-amplitude wave signals are at the maximum value, the synthesized voltage E sigma is the arithmetic addition of all the equal-amplitude wave voltages E1 and is at the maximum value. Thus, the output synthesized voltage can only be equal to or less than, and cannot exceed, the maximum output voltage Em of the power amplifier. This is because the signals are not added in phase but vector-added most of the time, and the resultant voltage E Σ after addition is much smaller than Em, so that the power amplifier output power is much smaller than Pm during the power amplifying part time, and thus the average output power of the power amplifier is only 1/n of the full power output. The maximum output power is only at the minimum time, so the power capacity utilization rate of the power amplifier is very low. The continuous spectrum blocking type interference scheme adopts a single-part jammer single-oscillation source broadband continuous frequency modulation mode, and the existing methods of direct amplification of broadband radio frequency noise, broadband frequency modulation of noise and the like are adopted at present. The broadband radio frequency noise is directly amplified by adopting a white noise source to output and is amplified by a power amplifier to generate blocking type interference. The white noise source has a broadband frequency spectrum, but the output energy is smaller, the power capacity utilization rate of the power amplifier is still lower because the noise output voltage is not a constant amplitude wave and the power efficiency is also low. To make the power capacity of the power amplifier high in utilization rate, continuous constant-amplitude frequency modulation waves can be adopted, and the noise is adopted to implement broadband frequency modulation on the oscillation source so as to generate a broadband frequency spectrum. However, because the amplitude of the noise voltage is normally distributed, the energy of the broadband spectrum generated after frequency modulation is unevenly distributed in the frequency domain, and the requirement that the energy of each interference component in the blocking type interference broadband spectrum is the same cannot be met.
The disadvantages of the prior art are: the effective power utilization rate of the comb-shaped spectrum interference scheme is too low, the interference signal spectrum of the continuous spectrum blocking interference scheme is not uniform, and the interference of the same power can not be carried out on all frequency hopping frequency points, so that the interference effect is affected.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a multichannel multi-band interference signal generator,
the aim of the invention is realized by the following technical scheme:
the multi-channel multi-band interference signal generator consists of a sawtooth wave generating circuit and a frequency modulation circuit, wherein the sawtooth wave generating circuit mainly consists of a 555 trigger, a PNP (plug-and-play) triode, an NPN triode I, an NPN triode II and a protection resistor;
the base electrode and the emitter electrode of the PNP triode are connected with power supply voltage, and the collector electrode is connected with a high/low level trigger end of the 555 trigger;
the base electrode and the collector electrode of the NPN triode I are connected with power supply voltage, the emitter electrode of the NPN triode I is grounded, and the collector electrode is also connected with the voltage control end of the 555 trigger;
the base electrode of the NPN triode II is connected with the output end of the 555 trigger, the collector electrode is connected with the power supply voltage, the base electrode of the NPN triode I and the power supply voltage, and the emitter electrode is grounded;
a sliding rheostat is connected in series between the power supply voltage and the base electrode of the PNP triode, and the discharge end of the 555 trigger is used as a sawtooth wave output end;
the frequency modulation circuit mainly comprises three voltage-controlled oscillators, the sawtooth wave output ends are respectively connected with the control ends of the voltage-controlled oscillators, the voltage-controlled oscillators are respectively provided with a modulating circuit with bandwidth and a central frequency point, and the central frequency points of the three-way modulating circuit are respectively 1.6GHz, 2.4GHz and 5.75GHz.
Preferably, the power supply voltage is 5V.
As a further improvement of the scheme, a resistor R3 and a resistor R4 are respectively connected in series and protected among the base electrode, the emitter electrode and the power supply voltage of the PNP triode.
As a further improvement of the scheme, the collector of the PNP triode is connected with a grounding capacitor C7.
As a further improvement of the scheme, the voltage control end of the 555 trigger is connected with a grounding capacitor C6.
As a further improvement of the scheme, a resistor R7 and a resistor R6 are respectively connected in series between the base electrode, the collector electrode and the power supply voltage of the NPN triode I.
As a further improvement of the scheme, a resistor R8 is connected in series between the base electrode of the NPN triode II and the output end of the 555 trigger.
As a further improvement of the scheme, the sawtooth wave output end and the control end of the voltage-controlled oscillator are connected in series with a signal processing circuit, the signal processing circuit is composed of two sliding varistors, two protection resistors and a capacitor, the sawtooth wave output end is connected with the head end of a first sliding varistors, the main tap of the first sliding varistors is connected with the capacitor and then is connected with the control end of the voltage-controlled oscillator after being connected with the first resistor in series, the main tap of the second sliding varistors is connected with the head end of a second resistor in series, the head end of the second sliding varistors is connected with the tail end of the first sliding varistors, the tail end of the second sliding varistors is grounded, and the tail end of the second resistor is connected between the capacitor and the first resistor.
The beneficial effects of the invention are as follows: the module consists of a sawtooth wave generating circuit and a frequency modulation circuit, the amplitude of the broadband frequency modulation wave is the same in the time domain, and the drastic change of the amplitude does not exist, so that the power margin of the amplifier is effectively utilized. On the frequency domain, the frequency spectrum is continuously swept in the bandwidth, each frequency point is uniformly covered, and the amplitude of each spectral line is basically equal. The sawtooth wave is modulated on the voltage-controlled oscillator to generate spectral lines with basically equal amplitude, and the spectral lines are continuously distributed, and the amplitude difference is not more than 1dB.
Drawings
FIG. 1 is a diagram of a sawtooth generation circuit;
fig. 2 is a signal processing circuit diagram;
fig. 3 is a diagram of a frequency modulation circuit.
Detailed Description
The technical scheme of the present invention is described in further detail below with reference to specific embodiments, but the scope of the present invention is not limited to the following description.
The signal generator consists of a sawtooth wave generating circuit and a frequency modulation circuit.
As shown in fig. 1:
each port of the 555 trigger is respectively: the power supply comprises a grounding end 1, a low level trigger end 2, an output end 3, a reset end 4, a voltage control end 5, a high level output end 6, a discharge end 7 and a voltage end 8.
The sawtooth wave generating circuit comprises a 555 trigger N2, a PNP triode V1, an NPN triode IV 2, an NPN triode IIV 3, resistors R3, R4, R5, R6 and R7, capacitors C6 and C7 and a sliding rheostat RP1. The base electrode and the emitter electrode of the PNP triode V1 are connected with 5V power supply voltage, the collector electrode is connected with high/low level trigger ends of the 555 trigger, namely ports 2 and 6, the base electrode and the collector electrode of the NPN triode I V2 are connected with the power supply voltage, the emitter electrode of the NPN triode I V2 is grounded, and the collector electrode is also connected with a voltage control end of the 555 trigger; the base electrode of the NPN triode II V3 is connected with the output end of the 555 trigger, the collector electrode is connected with the power supply voltage, the base electrode of the NPN triode I V2 and the power supply voltage, and the emitter electrode is grounded; the discharging end of the trigger of the slide rheostat RP1 and 555 is connected in series between the power supply voltage and the base electrode of the PNP triode V1 and is used as a sawtooth wave output end. The base, the emitter and the power supply voltage of the PNP triode V1 are respectively connected in series with a protection resistor R3 and a resistor R4, the collector of the PNP triode V1 is connected with a grounding capacitor C7, the voltage control end of the 555 trigger is connected with a grounding capacitor C6, the base, the collector and the power supply voltage of the NPN triode I V2 are respectively connected in series with a resistor R7 and a resistor R6, and the base of the NPN triode II V3 is connected in series with a resistor R8.
The frequency modulation circuit mainly comprises three voltage-controlled oscillators, the sawtooth wave output ends are respectively connected with the control ends of the voltage-controlled oscillators, the voltage-controlled oscillators are respectively provided with a modulation circuit with bandwidth and a central frequency point, and the central frequency points of the three-way modulation circuit are respectively 1.6GHz, 2.4GHz and 5.75GHz.
As shown in fig. 2:
the sawtooth wave output end is connected with the control end of the voltage-controlled oscillator in series and is provided with a signal processing circuit, the signal processing circuit consists of two sliding varistors, two protection resistors and a capacitor, one path of the signal processing circuit is used for explanation, the sawtooth wave output end is connected with the head end of the sliding varistors RP2, the RP2 main tap is connected with a capacitor C8 and then is connected with the control end V-TUNE of the voltage-controlled oscillator after being connected with a resistor R12 in series, the tail end of the sliding varistors RP2 is connected with the head end of another sliding varistors RP3, the tail end of the RP3 is grounded, the RP3 main tap is connected with a resistor R9, and the other end of the resistor R9 is connected between the capacitor C8 and the resistor R12.
As shown in fig. 3:
the modulation circuit is a bandwidth and center frequency point modulation circuit formed by connecting a capacitor, a resistor and an inductor in series at the radio frequency output end of the voltage-controlled oscillator, so that the center frequency points of three paths of output are respectively 1.6GHz, 2.4GHz and 5.75GHz.
Description of working principle:
according to the scheme, the discharge end of the trigger is regulated to output signals through the triode and the slide rheostat together, so that sawtooth wave output is obtained, the output sawtooth wave is subjected to signal processing and then reduced in interference and enters the modulation circuit, so that an output signal with fixed frequency is obtained, and the amplitude of the broadband frequency modulation wave is identical in a time domain, so that the severe change of the amplitude does not exist, and the power margin of the amplifier is effectively utilized. On the frequency domain, the frequency domain is continuously swept within the bandwidth, each frequency point is uniformly covered, the amplitude of each spectral line is basically equal, and the amplitude difference is not more than 1dB.
The foregoing is merely a preferred embodiment of the invention, and it is to be understood that the invention is not limited to the form disclosed herein but is not to be construed as excluding other embodiments, but is capable of numerous other combinations, modifications and environments and is capable of modifications within the scope of the inventive concept, either as taught or as a matter of routine skill or knowledge in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.
Claims (5)
1. The multichannel multi-band interference signal generator consists of a sawtooth wave generating circuit and a frequency modulation circuit, and is characterized in that the sawtooth wave generating circuit mainly consists of a 555 trigger, a PNP triode, an NPN triode I, an NPN triode II and a protection resistor;
the base electrode and the emitter electrode of the PNP triode are connected with power supply voltage, and the collector electrode is connected with a high/low level trigger end of the 555 trigger; the base electrode and the collector electrode of the NPN triode I are connected with power supply voltage, the emitter electrode of the NPN triode I is grounded, and the collector electrode is also connected with the voltage control end of the 555 trigger;
the base electrode of the NPN triode II is connected with the output end of the 555 trigger, the collector electrode is connected with the power supply voltage, the base electrode of the NPN triode I and the power supply voltage, and the emitter electrode is grounded;
a sliding rheostat is connected in series between the power supply voltage and the base electrode of the PNP triode, and the discharge end of the 555 trigger is used as a sawtooth wave output end;
the frequency modulation circuit mainly comprises three voltage-controlled oscillators, the sawtooth wave output ends are respectively connected with the control ends of the voltage-controlled oscillators, the voltage-controlled oscillators are respectively provided with a modulating circuit with bandwidth and a central frequency point, and the central frequency points of the three-way modulating circuit are respectively 1.6GHz, 2.4GHz and 5.75GHz;
the sawtooth wave output end is connected with the control end of the voltage-controlled oscillator in series and is composed of two sliding varistors, two protection resistors and a capacitor, the sawtooth wave output end is connected with the head end of a first sliding varistors, a main tap of each first sliding varistors is connected with the capacitor and then is connected with the control end of the voltage-controlled oscillator after being connected with the first resistor in series, a main tap of each second sliding varistors is connected with the head end of each second resistor in series, the head end of each second sliding varistors is connected with the tail end of each first sliding varistors, the tail end of each second sliding varistors is grounded, and the tail end of each second resistor is connected between the capacitor and the first resistor;
the voltage control end of the 555 trigger is connected with a grounding capacitor C6;
and a resistor R7 and a resistor R6 are respectively connected in series between the base electrode, the collector electrode and the power supply voltage of the NPN triode I.
2. The multi-channel, multi-band interference signal generator of claim 1 wherein the supply voltage is 5V.
3. The multi-channel and multi-band interference signal generator of claim 2 wherein the base, emitter and supply voltages of the PNP transistor are connected in series with and protect resistor R3 and resistor R4, respectively.
4. The multi-channel multi-band interference signal generator of claim 3 wherein a collector of said PNP transistor is connected to a grounded capacitor C7.
5. The multi-channel and multi-band interference signal generator according to claim 1, wherein a resistor R8 is connected in series between the base of the NPN triode ii and the output terminal of the 555 trigger.
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