CN102638271A - High repetition frequency jamming-resistant laser encoding system and laser encoding method - Google Patents
High repetition frequency jamming-resistant laser encoding system and laser encoding method Download PDFInfo
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Abstract
The invention relates to a high repetition frequency jamming-resistant laser encoding method. Due to the threat of high repetition frequency laser active jamming to the laser semi-active homing guidance, aiming at a tunable laser generating nanosecond level pulse width, the invention provides the encoding of pulse width and pulse amplitude by directly clipping with an electro-optical switch; the phase difference generated by static double refraction is compensated by an orthorhombic KTP (potassium titanium oxide phosphate) crystal; the delay and the error can be reduced due to the synchronous control of a pockels cell power supply; the laser encoding, the pulse width encoding and the pulse amplitude modulation are combined with one another, so that the PAWM (puto amo window manager) encoding which not only can resist the laser angle deception jamming but also can resist the high repetition frequency jamming can be formed; and the method of high repetition frequency jamming resistance is improved on a guidance head, so that a novel laser encoding system can be formed, wherein the system is suitable for the aspects such as tracking, guidance, positioning, collimation, photo-communication APT (arbitrage pricing theory) technology, and photoelectronic warfare.
Description
Technical field
The present invention relates to a kind of coding method, especially a kind of laser code method.Be widely used in aspects such as tracking, guidance, location, collimation, optical communication, APT technology, electrooptical countermeasures.
Background technology
In existing laser semi-active homing guidance (tracking) system, the laser pulse that adopts coding is that laser semi-active homing guidance (tracking) realizes following the tracks of simultaneously multiple target and the important means that improves interference free performance as guidance signal.
Laser guidance (tracking) is the indication information source with the laser signal.Can be divided into active, semi-active type and passive type from the aiming means, wherein, half is initiatively comparatively commonly used.Semiactive homing laser guidance (tracking) system mainly is made up of the laser seeker on the tracker and the outer laser target designator two parts of tracker.In the guidance process, laser target designator aim at all the time irradiation the target that will follow the tracks of.Target seeker then utilizes the laser signal of target reflection to carry out target-seeking.When tracker during apart from the target certain distance, indicating device begins to target emission laser pulse, and target seeker also begins to search for the laser signal from target reflection.Target seeker in search in the laser signal of target reflection, also will be to the identification of be correlated with of its signal of receiving, after it meets the guidance signal form of self when affirmation, just begin to get into the homing stage.Whole guidance process is divided inertial guidance, target search and homing three phases.
Semiactive homing aiming means, the reflector of its guidance signal (laser target designator) is separated from each other with receiver (tracker laser seeker), and the pulse code form of guidance signal is the agreement of appointing in advance.Target seeker will pass through these a series of processes of reception-identification-affirmation to the processing of pilot signal, also its such characteristic just, and making us implement effective active jamming to it becomes possibility.
Laser Modulation is meant with laser and modulates through physical characteristic such as parameters such as laser energy, pulse duration, repetition rate, pulse spacing, pulse amplitude, wavelength and phase place to laser as information carrier, makes laser carry information as much as possible.Laser code is meant to be modulated laser target designator emitted laser pulse physical characteristic.
The laser code purpose: the one, solve the unlikely confusion that causes when a plurality of trackers of synchronization are followed the tracks of different target simultaneously; The 2nd, solve and follow the tracks of the problem that a plurality of laser target designators of a plurality of targets interfere with each other simultaneously at synchronization; The 3rd, the antagonism Active laser interference.
Laser target designator is through the laser pulse of coding to the target emission, just thinks to have caught target behind the appointment laser code that target seeker only presets before receiving emission.Adopt coding, can avoid " repeat track " to improve anti-active interference ability.The laser pulse repetition frequency of coding should be suitably high so that target seeker has enough data transfer rates.Analysis shows for fixing target; Repetition rate 5 pulses/s gets final product; Then should be to moving target in 10 pulses/more than the s, but not obvious in the effect of 20 pulses/more than the s, and the volume of laser and weight will greatly increase; So within 10-20 pulse/s, the work repetition rate that reaches laser target designator is at 10-20Hz usually.
The current Active Jamming Technique that can resist laser semi-active homing guidance effectively mainly contains two kinds: the Methods of Laser Angle Deception formula is disturbed and high Repetition Frequency Laser is disturbed.The interference of Methods of Laser Angle Deception formula need identify the minimum code cycle of laser code; Its interference mechanism is identification and duplicates the laser code signal; Synchronous or leading synchronous laser interference signal is shone on the false target; Cause target seeker can't distinguish guidance signal and interference signal, and realize disturbing purpose; High Repetition Frequency Laser is disturbed the characteristic that need not discern the laser code signal usually; Its interference mechanism is to adopt high Repetition Frequency Laser pulse direct irradiation target seeker; Interference signal is got within the ripple door prior to guidance signal, cause target seeker can't distinguish guidance signal and interference signal, realize disturbing purpose.
Laser semiactive guidance (tracking) system is commonly used to resist the dual mode that laser active cheating formula is disturbed: the one, target indication signal is encoded, and at target seeker corresponding decoding circuit decoding is set simultaneously; The 2nd, pulse admission ripple door is set in the tracking system of target seeker.Gating ripple door is exactly the gate that external information is come in and gone out, and during unlatching, allows the information typing, when closing, and the prohibition information typing.Gating ripple door is positioned at the information processing part of tracker.Usually these two kinds of measures are adopted simultaneously.
Laser semi-active homing guidance (tracking) target seeker is made up of two major parts: position marker (detector) and electronic compartment.Position marker is responsible for the absorption and the opto-electronic conversion of folded light beam; Electronic compartment is responsible for the formation of Signal Processing, calculating and control command.The influence of many factors such as time base error of delay difference, indicating device and the target seeker of laser signal can not be provided with too smallly when the width of pulse admission ripple door was changed by ripple door form, laser frequency shake, tracker target seeker and target range.The fixed gatewidth is generally hundreds of microseconds, and real-time type ripple door can be arranged on 30～50 μ s, and this only reduces operating frequency greatly at the interference effect of tens hertz laser angle formula cheating interference.
The encoding context that presets at laser target designator; Existing pulsewidth coding technology mainly is the present situation that is subject to disturb to the laser pulse repetition frequency coding; When there is the Pockers cell slicing in the scheme that adopts light, electric pulse be difficult to realize the difficult point of strict synchronism control, and do not consider the static birefringent compensation of Pockers cell.And PAWM coding of the present invention can resist the interference of laser trick formula; Also can resist the high repetition of laser disturbs; And adopted Pockers cell power supply Synchronization Control scheme, solved the Synchronization Control problem of light, electric pulse, adopted the ktp crystal of two quadratures to realize the static birefringent compensation problem.
Laser seeker (tracker) anti-interference aspect, generally adopt two kinds of counterplans, all there is certain shortcoming in these two kinds of schemes.Scheme one is just only used 5 pulse discussion, three types of situation the when situation of the random pulses more than 6 and 6 all can range 5 random pulses when seeking the cycle of the high repetition interference signal of laser; The cycle of high repetition disturbing pulse is low to moderate tens microseconds, even a few microsecond, and by the situation of scheme one, the cycle between the pulse of guidance signal and interference signal is littler, so can not accurately measure the high repetition pulse period.When the method that scheme two adopts sampling Bo Mennei signals and gate signal to contrast is eliminated high repetition; Need contrast one by one to eliminate, operand is very big, simultaneously; If high repetition interference signal all is ahead of guidance signal and gets into the ripple door, then the method for scheme two can not be eliminated the interference of high repetition signal.
Summary of the invention
Existing coding method is prone to by the problem of the high repetition interference of laser the application to the laser semi-active homing guidance armament systems; Design a kind of novel laser anti-interference coding system; Preset the PAWM coding at laser target designator, disturb to resist high repetition interference and trick formula; On target seeker, adopt counting ripple door and electronic switch, the high repetition of antagonism multi-source laser is disturbed.This system comprises: target-seeking system on laser target designator and the bullet (target seeker comprises: detector, amplification and logical operation, signal processing circuit, gyro).Preset nanosecond pulsewidth tunable laser at laser target designator and carry out the PAWM coding; Adopt counting ripple door to carry out moment record in the target seeker signal processing circuit, measure the cycle of high repetition interference signal, seek the synchronous points of reverse high repetition signal,, eliminate high repetition interference signal with the high repetition electronic switch of reverse high repetition signal controlling.
Laser target designator adopts the pulsewidth tunable laser, realizes pulsewidth coding and pulse amplitude coding, and information-processing circuit, pulsewidth are discerned the echo signal of amplifying circuit after to opto-electronic conversion and discerned, decode, thereby distinguish true target and interference signal.The PAWM coding is specially: the pulsewidth tunable laser is realized the coding of pulse duration and pulse amplitude by the electrooptical switching slicing; The phase difference that the KTP of quadrature (KTP) crystal compensation static birefringent produces; Pockers cell power supply Synchronization Control reduces delay and error; Adjustable pulse duration and pulse amplitude are stablized in generation, and laser encoder modulating pulse width and pulse amplitude form the PAWM coding.
The guidance signal that contains high repetition interfering signal that detector obtains is by the gating ripple door and counting ripple door of signal processing circuit; Counting ripple door is in conjunction with the cycle of the high repetition interfering signal of record measurement constantly; Confirm the starting point of reverse high repetition signal at counting Bo Mennei according to the high repetition interfering signal cycle, send as synchronous points and high repetition signal reverse periodic signal fully with starting point.With the high repetition electronic switch of reverse high repetition signal controlling, eliminate high repetition interference signal.Effective electro-optic coefficient γ according to ktp crystal
ClProcess electrooptical switching, two identical ktp crystal quadratures are placed, and realize the static birefringent compensation of crystal, and Q impulse is carried out slicing.Can choose the synchronous points of first pulse signal of counting Bo Mennei as reverse high repetition signal.
The present invention is directed to the approach that produces nanosecond pulse width laser device; Propose a kind of use the method realization pulse duration of the direct slicing of electrooptical switching and the coding method of pulse amplitude, designed a kind of Methods of Laser Angle Deception formula of can resisting and disturbed the PAWM coding that can resist high Repetition Frequency Laser interference again; Proposing on the target seeker technological ripple door of employing simultaneously accurately measures high repetition interference period and resists the high repetition interference of multi-source laser with the method that high repetition electronic switch reverse sync is eliminated high Repetition Frequency Laser interference signal.Can realize strict synchronism control, accurately measure the high repetition pulse period, reduce operand.Its interference free performance obviously improves, and the scope of application increases, and has application scenario aspect the antagonism of high repetition interference of laser and the interference of laser trick formula.Two parts of this scheme can independently be used the interference under the antagonism different situations, and the high repetition of laser that can be used in combination again under the antagonism complex situations is disturbed.
Description of drawings
The high Repetition Frequency Laser of Fig. 1 is disturbed sketch map
Fig. 2 laser semiactive homing system
Fig. 3 laser pulse coding and recognition principle figure
Fig. 4 KTP electrooptical switching slicing shaping principle schematic
Two ktp crystal quadratures of Fig. 5 are placed sketch map
Fig. 6 Pockers cell power supply Synchronization Control scheme
Fig. 7 resists high Repetition Frequency Laser jamming program one schematic diagram
The ripple door sketch map of the anti-high Repetition Frequency Laser jamming program two of Fig. 8
The high repetition anti-interference process of Fig. 9 laser model
(a) interference model sketch
(b) ripple of improvement project signal processing model outdoors
Embodiment
The laser pulse that the interference mechanism of high Repetition Frequency Laser perturbation technique just is to utilize enough high repetition frequencies is as interference signal; Guarantee to have two disturbing pulses at least at target seeker gating Bo Mennei; Force its detection system high probability ground to handle interference signal, thereby make target seeker form the wrong flight of controlling guidance of guidanceing command.For the interference laser of high repetition,, have a disturbing pulse at least and get into the ripple door as long as when repetition rate f μ 1/ τ (τ is a ripple door time width).When disturbing pulse gets into ripple door and intensity greater than guidance signal before than guidance signal, will form effective interference to target seeker, its principle is as shown in Figure 1.
The approach that resists high Repetition Frequency Laser interference mainly contains two kinds at present: the one, and design can resist the novel coding of high repetition on target-designator; The 2nd, the high repetition of signal processing filtering on the laser seeker.Along with the development of laser technology, the laser that repetition rate is high, single pulse energy is big reaches its maturity, and high repetition frequency laser active is disturbed has become a kind of conflicting mode that has future, has the code identification of need not, implements the advantage simple, that real-time is good.
The mechanism that high repetition is disturbed to laser; The present invention designs a kind of laser anti-interference coding system; Laser semiactive homing system schematic diagram as shown in Figure 2 presets nanosecond pulsewidth tunable laser at laser target designator and carries out the PAWM coding, is specially; Use the direct slicing of electrooptical switching to realize the coding of pulse duration and pulse amplitude; Adopt KTP (KTP) crystal of quadrature to compensate the phase difference that static birefringent produces, adopt Pockers cell power supply Synchronization Control to reduce and postpone and error, produce and stablize adjustable pulse duration and pulse amplitude; Laser encoder modulating pulse width and pulse amplitude form a kind of Methods of Laser Angle Deception formula of can resisting and disturb the PAWM coding that can resist high Repetition Frequency Laser interference again.
The high repetition of antagonism multi-source laser is disturbed on target seeker.Adopt counting ripple door to carry out moment record, measure the cycle of a plurality of high repetition interference signals, seek the synchronous points of reverse high repetition signal,, eliminate high repetition interference signal with high repetition electronic switch closes of reverse high repetition signal controlling.When the high repetition of multi-source laser is disturbed, in the cycle that can measure the high repetition interference signal of each laser respectively, eliminate interference signal one by one.This method can not only effectively be got rid of high repetition interference signal, does not influence the guidance signal quality simultaneously again.
1. laser designator presets coding
Adopt the pulse duration tunable laser to realize the laser pulse width coding.Nanosecond pulsewidth tunable laser can adopt following three kinds of modes to realize:
One, utilizes the dye Q technology of Brillouin scattering (SBS), can realize that the SBS pulsewidth is adjustable continuously through single cell Brillouin scattering or two-cell Brillouin scattering; Two, adopt the electrooptic crystal optical gate laser pulse cutting slicing of prime driver output to be obtained the laser pulse of any reshaping; Three, adopt electrooptical switching directly to single Laser Devices output pulsecutting, but promptly in the electric light Q-switched laser, realize that through control electric pulse that electrooptic crystal adds high pressure the pulsewidth of laser pulse is adjustable.
The third scheme is easier to realize coding control, can realize slicing, shaping to any Q impulse, has good stability.Therefore, this instance is the adjustable output that the example explanation realizes pulse duration with the third scheme.
Laser pulse coding as shown in Figure 3 and recognition principle figure.The laser pulse coding comprises: pulsewidth coding laser, double four quadrant photoelectric avalanche photodide, pulsewidth identification amplifying circuit, pulse combiner circuit, signal processing circuit, orientation and rudder signal, code width are selected.
Laser target designator adopts the pulsewidth coding laser; The laser application Programmable Logic Controller is realized pulsewidth coding and pulse amplitude coding; Through the guidance signal irradiation of coding the target that will attack; The photodetector of target seeker (can adopt the double four quadrant photoelectric avalanche photodide) detects guidance signal, discerns, decodes through pulsewidth identification amplifying circuit, the information-processing circuit echo signal after to opto-electronic conversion, thereby can distinguish true target and interference signal; And then the control command of formation orientation and rudder signal, the control guided missile flies to target.
The pulsewidth coding laser preferably adopts: wavelength 1.064 μ m, pulse duration should be able to be adjustable between 5～50ns.Suppose that three pulsewidths are respectively M0 (10ns), M1 (20ns), M2 (30ns), single pulse energy 30～60mJ, operating frequency 20Hz.The pulsewidth coding laser adopts effective electro-optic coefficient γ of ktp crystal
ClThe electrooptical switching of processing, two identical ktp crystal quadratures are placed, and realize the static birefringent compensation of crystal, and it is applied to the slicing of Q impulse, and implementation is as shown in Figure 4.
Adopt the Nd:YAG laser like the electrooptical switching slicing, operation wavelength 1.064 μ m, output is about the long pulse of 50ns; After receiving the light signal that reflects out from spectroscope when the GaAs photoconductivity switching, the electric pulse consistent with optical pulse shape exported in the conducting of GaAs photoconductivity switching; When electrical pulse amplitudes during greater than predetermined value; Trigger high electric field pulse and form device generation high electric field pulse,, adopt microstrip transmission line output Shaping electric pulse through the delay circuit of PLC (Programmable Logic Controller) control; And adjustable amplitude value; To drive the Pockers cell slicing shaping of quadrature ktp crystal, the laser signal after the laser amplifier that pumping source drives is handled the shaping of back output slicing then, Lip river breast biprism has played the effect of inclined to one side and analyzing respectively.
Wherein two ktp crystal quadratures in the KTP Pockers cell are placed best as shown in Figure 5.Its objective is that the phase difference that produces for the static birefringent that ktp crystal is existed compensates.Fig. 5 is the basic structure of two KTP electrooptical switchinges, in three-dimensional system of coordinate, and crystal vertical major x cutting, light beam is propagated along the y direction, logical light length L, z direction added electric field, electrode spacing is d.Be placed on the crystal two ends two polarizers play folk prescription to mutually orthogonal, and the polarization direction all becomes 45 with the z axle.
The power supply of Pockers cell can adopt the Synchronization Control scheme among Fig. 4, and is as shown in Figure 6, can effectively reduce the error that postpones to produce.
The Synchronization Control scheme of Pockers cell power supply is the controllable silicon of a trigger impulse s1 external trigger laser discharge circuit of the each output of crystal control power supply; Thereby make laser through thyratron, electric capacity carry circuit, preionization and discharge output primary light pulse s2; Control power supply itself is from output s1 pulse moment trigger (this time-delay is adjustable); When the discharge circuit of the sensor laser of delay control circuit begins to discharge output optical pulse; Export an amplitude (crystal half-wave voltage) and all adjustable electric pulse s3 of pulsewidth is added on the Pockers cell by the high-voltage pulse circuit that is the main body with Krytron pipe (krytron), make light, electric pulse realize slicing synchronously.
PLC (Programmable Logic Controller) to the delay circuit control of encoding, not only can change the pulsewidth of Pockers cell two interpolar voltages according to coding requirement, changes the output laser pulse width regularly and realizes the laser pulse width coding, can also change its amplitude.Pulse amplitude modulation (PAW) is a kind of Laser Modulation mode commonly used in the laser communications.Be the pulse amplitude that changes spike train according to certain rules, to regulate a kind of modulation system of output variable and waveform.
For increasing the difficulty of identification decoding, further improve the antijamming capability of guidance system.Employing is not only carried out laser guidance signal pulse amplitude coding (PAM) but also is carried out pulsewidth coding (PWM), and the pulse amplitude coding adopts the large period loop coding, and pulsewidth coding adopts the minor cycle loop coding.Like this, through the PAWM coding (pulse amplitude and width coding) of while PAM and PWM coding, not only can resist the interference of Methods of Laser Angle Deception formula but also can resist the high repetition of laser and disturb.
Below lift the concrete coding of an example explanation, establish 8 amplitudes of existence (PA) A1 at interval, A2, A3, A4, A5, A6, A7, A8 and four pulse durations (PW) b1, b2, b3, b4 is as shown in table 1.
Table 1 pulse amplitude, width and address
| Sequence number | The address | PA | PW |
| 1 | 0 | A1 | b1 |
| 2 | 1 | A2 | |
| 3 | 2 | A3 | b3 |
| 4 | 3 | A4 | b4 |
| 5 | 4 | A5 | |
| 6 | 5 | A6 | |
| 7 | 6 | A7 | |
| 8 | 7 | A8 |
Pulse amplitude in the his-and-hers watches 1 is arranged as as if employing address difference at interval:
can compile out 8 group codes according to head interval difference, adopts 3 binary representations; Can be expressed as 000,001,010; 011,100,101; 110,111, as shown in table 2.
Table 2PAM coding
| 000 | 001 | 010 | 011 | 100 | 101 | 110 | 111 |
| A1 | A2 | A3 | A4 | A5 | A6 | A7 | A8 |
| A2 | A3 | A4 | A5 | A6 | A7 | A8 | A1 |
| A7 | A8 | A1 | A2 | A3 | A4 | A5 | A6 |
| A5 | A6 | A7 | A8 | A1 | A2 | A3 | A4 |
| A7 | A8 | A1 | A2 | A3 | A4 | A5 | A6 |
| A6 | A7 | A8 | A1 | A2 | A3 | A4 | A5 |
| A1 | A2 | A3 | A4 | A5 | A6 | A7 | A8 |
Pulse duration in the his-and-hers watches 1, adopt address difference to be arranged as:
according to the difference of first width, compiles out 4 group codes; Use binary representation; Can be expressed as 00,01,10; 11, as shown in table 3.
Table 3PWM coding
| 00 | 01 | 10 | 11 |
| b1 | b2 | b3 | b4 |
| b3 | b4 | b1 | b2 |
| b2 | b3 | b4 | b1 |
Through with after PAM and the PWM combination, can obtain 32 group codings, be listed in here in the table 4, as shown in table 4.
Table 4PAWM coding
| 000/00 | 001/01 | 010/10 | 011/11 |
| A1(b1) | A2(b2) | A3(b3) | A4(b4) |
| A2(b3) | A3(b4) | A4(b1) | A5(b2) |
| A7(b2) | A8(b3) | A1(b4) | A2(b1) |
| A5(b4) | A6(b1) | A7(b2) | A8(b3) |
| A7(b3) | A8(b4) | A1(b1) | A2(b2) |
| A6(b1) | A7(b2) | A8(b3) | A1(b4) |
| A1(b4) | A2(b1) | A3(b2) | A4(b3) |
Visible by above-mentioned PAWM coding, this coding not only has randomness but also have password property, and its standard type, versatility and extensibility are good.On the basis of pulse amplitude modulation, add pulsewidth coding, its interference free performance that anti-Methods of Laser Angle Deception formula is disturbed and high Repetition Frequency Laser is disturbed obviously increases.
The anti-interference scheme of laser of the present invention is made up of two parts: the high repetition jamming program of anti-multi-source laser on PAWM coding in the laser target designator and the target seeker.The coding form that the PAWM coding method is preset from laser target designator is resisted the high repetition of laser and is disturbed, and the anti-high Repetition Frequency Laser jamming program of tracker is to go out to send the situation that the high repetition of a plurality of laser of design antagonism is disturbed from the angle of ripple door.These two parts were both separate, can mutually combine again to make to be used for better resisting more complex laser disturbed condition.
2. the anti-high Repetition Frequency Laser of tracker is disturbed
A kind of PAWM coding that can resist interference of Methods of Laser Angle Deception formula and the interference of high Repetition Frequency Laser simultaneously that on laser target designator, presets, anti-interference for better realization, the present invention further improves tracker, and the realization tracker resists high Repetition Frequency Laser to disturb.
Present embodiment is considered the situation that a high Repetition Frequency Laser interference source or a plurality of high Repetition Frequency Laser interference source exist.Usually adopt following dual mode to realize resisting high repetition to disturb at present:
First kind of scheme: according to the principle of all places of guidance signal in interference signal being wanted complete classification, 5 of picked at random and above adjacent pulse signal calculate cycle of high repetition; Seek the synchronous points of reverse high repetition switch, send and the complete reverse periodic signal of high repetition interference signal; Use the high repetition electronic switch of reverse high repetition signal controlling, eliminate high repetition interference signal.Its operation principle is as shown in Figure 7.
Second kind of scheme: two ripple doors are set between two gating ripple doors, and " the counting ripple door " of a broad counted the pulse signal on the detector, judges whether to receive high Repetition Frequency Laser and disturbs threat; The sampling ripple door that another is narrower obtains the signal that high Repetition Frequency Laser produces on detector, as the reference of distinguishing interference signal and guidance signal.
The target seeker signal processing circuit that is positioned at electronic compartment is after a gating ripple door; Start " counting ripple door " earlier; Pulse signal on the optical detection system detector that is arranged in target seeker is counted, and according to the number of counting pulse signal, judges whether target seeker can be interfered.After confirming to receive effective high repetition interference; Start the signal that " sampling ripple door " high Repetition Frequency Laser pulse of record produces on detector; After subsequently gating ripple door is opened, compare one by one with the pulse signal of Bo Mennei, if consistent; Think that then interference signal rejects, otherwise just think guidance signal.Fig. 8 is the ripple door sketch map of anti-high Repetition Frequency Laser interfering process, and solid line is represented gating ripple door, pecked line representative " counting ripple door ", dotted line representative " sampling ripple door ".
First kind of scheme only used 5 pulse discussion just, three types of situation the when situation of the random pulses more than 6 and 6 all can range 5 random pulses when seeking the cycle of the high repetition interference signal of laser; The cycle of high repetition disturbing pulse is low to moderate tens microseconds, even a few microsecond, and the cycle between the pulse of guidance signal and interference signal is littler, can not accurately measure the problem of high repetition pulse period so exist.When scheme two adopts the sampling Bo Mennei signals and the method for gate signal contrast to eliminate high repetition, need contrast elimination one by one, operand is very big.Simultaneously, get into the ripple door if high repetition interference signal all is ahead of guidance signal, then the method for scheme two can not be eliminated the interference of high repetition signal.
Based on the problem that aforementioned anti-high repetition frequency laser active jamming program exists, this paper proposes following improvement project.
When interference signal overlaps with guidance signal, play the effect of strengthening guidance signal, can not form effective interference.Mechanism by high Repetition Frequency Laser impulse disturbances can be known, could form effectively when having only the leading guidance signal of interference signal to get into gating ripple door and disturb.
Hypothetical target is static, and high Repetition Frequency Laser interference source is at tracker (like the target seeker among Fig. 9 (a)), on the extended line of target link floor projections.High Repetition Frequency Laser interference model like Fig. 9 (a) and gate signal control and treatment circuit principle shown in Fig. 9 (b).The gate signal control and treatment circuit is positioned at the electronic compartment of laser guidance system keeps track device.Among Fig. 9 (b), the composite signal by guidance signal and high repetition interference signal form gets in the tracker through photodetector, the entering of the gating ripple gate control composite signal in the electronic compartment, and the counting ripple door between gating ripple door is started working simultaneously,
Composite signal (guidance signal that contains high repetition interference signal) is through gating ripple door and counting ripple door; Carry out high repetition period measurement through counting ripple door; Obtain reverse high repetition synchronizing signal, the control high frequency electronic switch is to the guidance signal output control signal through gating ripple door.The cycle of at first constantly writing down the high repetition interference signal of Laser Measurement through the combination of counting ripple door; Confirm the starting point of reverse high repetition signal then at counting Bo Mennei according to the high repetition cycle of having measured; Send and the complete reverse periodic signal of high repetition signal as synchronous points with starting point at last; With high repetition electronic switch closes of this signal controlling, eliminate the high repetition interference signal in the composite signal again.
Concrete implementation illustrates as follows:
(1) obtains cycle of high repetition signal
Counting ripple door is set between gating ripple door.As when only having a high repetition interference signal source to exist, the time t of first signal of record count Bo Mennei
1Time t with last signal
n, obtain counting the total time t=t of Bo Mennei
n-t
1, the pulse number of sampling is n, then can be according to formula:
T＝(t
n-t
1)/(n-1) (1)
Try to achieve two T average time between the pulse, promptly T is the cycle of high repetition signal.
If have two interference sources, and the frequency of two interference sources is identical, phase place is different.The time of first signal of design number Bo Mennei is t
1With the time of last signal be t
n, the sampling pulse number is n (n＞2 and for odd number), then can try to achieve the cycle T of two high repetition interference signals:
T＝(t
n-t
1)/((n-1)/2) (2)
Exist if any m the high repetition interference source that frequency is identical, phase place is different, the time of first signal of design number Bo Mennei is t
1Time t with last signal
n, the pulse number of sampling is n (n＞m and n-1 aliquot m), then can try to achieve the cycle T of a plurality of interference sources:
T＝(t
n-t
1)/((n-1)/m) (3)
(2) synchronous points of the reverse high repetition signal of searching
Seek the reverse signal synchronous points through counting ripple door.Because counting ripple door is between gating ripple door, there is not guidance signal in counting Bo Mennei, can choose the synchronous points of first pulse signal of counting Bo Mennei as reverse high repetition signal.
(3) elimination of high repetition interference signal
With the high repetition electronic switch of reverse high repetition signal controlling, when composite signal is just eliminated high repetition interference signal during through this electronic switch.Can consider suitably to widen the pulse duration of reverse high repetition signal, reach the purpose of the high repetition interference signal of better elimination.For the situation that a plurality of high repetition interference sources exist,, just can eliminate high repetition interference signal one by one with reference to the situation that an interference source exists as long as determine the cycle of interference source.If the high repetition interference source of a plurality of laser exists; Then measure the cycle of corresponding interference signal respectively,, control the interference signal that high repetition switch is eliminated this frequency in the synchronous points of counting Bo Mennei by an earlier definite reverse high repetition signal of interference signal cycle according to above-mentioned principle; Detect Bo Mennei again and whether have interference signal; If still have high repetition interference signal, then will export signal and get into the gate signal control and treatment circuit again as input signal, in like manner can eliminate the high repetition interference signal in another cycle; Till Bo Mennei detects less than interference signal, final guid-ance output.
Adopt LabVIEW that the present invention program is carried out simulating, verifying.Simulated program adopts the while loop structure, is used for the start-stop of control program; Use the sub-VI of pulse signal and " pulse " sub-VI to come simulated laser guidance signal and high repetition interference signal; Through single-frequency measure analog counting Bo Men and high repetition period measurement module; Adopt reverse high repetition pulse signal of high repetition interference signal periodic Control of measuring to eliminate the high repetition interference signal in the mixed signal.Wherein, " pulse " is the sub-VI of pulse signal that we design and produce the realized microsecond level delay of encapsulation.
Can draw the different interference source emulation contrasts of table 5:
The different interference source emulation contrasts of table 5
As can be seen from Table 5, no matter be one or a plurality of high Repetition Frequency Laser interference source existence, improved anti-interference method all can effectively be eliminated the interference of high Repetition Frequency Laser and not influence guidance signal on the target seeker.If with after improved method combines, the novel laser code method antagonism Methods of Laser Angle Deception formula of formation is disturbed and all raisings greatly of high Repetition Frequency Laser interference capability, can more adapt to the complicated operational environment with following a plurality of interference sources existence with PAWM coding.
The present invention is through disturbing the threat to laser semi-active homing guidance to high repetition frequency laser active; To producing nanosecond pulsewidth tunable laser; The coding that a kind of method of using the direct slicing of electrooptical switching realizes pulse duration and pulse amplitude is proposed; Adopt the ktp crystal of quadrature to compensate the phase difference that static birefringent produces simultaneously, and adopt Pockers cell power supply synchronisation control means to reduce delay and error, produce and stablize adjustable pulse duration and pulse amplitude; The laser code pulsewidth coding is combined with the pulse amplitude chopping phase; Form a kind of Methods of Laser Angle Deception formula of can resisting and disturb the PAWM coding that can resist high Repetition Frequency Laser interference again, the method that the high Repetition Frequency Laser of antagonism is disturbed on target seeker is simultaneously made improvement, forms the anti-interference scheme of a kind of novel laser.Its interference free performance obviously improves, and the scope of application increases, and has application scenario widely aspect the laser interference antagonism that becomes increasingly complex.
Claims (10)
1. the laser code system that anti-high repetition is disturbed is characterized in that, presets nanosecond pulsewidth tunable laser at laser target designator and carries out the PAWM coding; Adopt counting ripple door, gating ripple door in the target seeker signal processing; The guidance signal that contains high repetition interference signal is through gating ripple door and counting ripple door; Carry out high repetition period measurement through counting ripple door; Obtain reverse high repetition synchronizing signal, the control high frequency electronic switch is to the guidance signal output control signal through gating ripple door, the cycle that counting ripple door is measured high repetition interference signal according to moment record; Confirm the starting point of reverse high repetition signal at counting Bo Mennei according to the high repetition interference signal cycle; Send and the complete reverse periodic signal of high repetition signal as synchronous points with starting point, with high repetition electronic switch of this periodic signal control, eliminate the high repetition interference signal in the composite signal again.
2. system according to claim 1; It is characterized in that said laser target designator carries out the PAWM coding and is specially: the electrooptical switching slicing is realized the coding of pulse duration and pulse amplitude, the phase difference that the KTP ktp crystal compensation static birefringent of quadrature produces; Pockers cell power supply Synchronization Control reduces delay and error; Adjustable pulse duration and pulse amplitude are stablized in generation, and laser encoder modulating pulse width and pulse amplitude form the PAWM coding.
3. system according to claim 2 is characterized in that, nanosecond pulsewidth tunable laser adopts one of following three kinds of modes to realize pulsewidth coding: the dye Q technology that (1) utilizes Brillouin scattering SBS, realize that pulse duration is adjustable continuously; (2) adopt the electrooptic crystal optical gate laser pulse cutting slicing of prime driver output to be obtained the laser pulse of any reshaping; (3) adopt electrooptical switching directly to single laser output pulsecutting.
4. system according to claim 2 is characterized in that, according to effective electro-optic coefficient γ of ktp crystal
ClProcess electrooptical switching, two identical ktp crystal quadratures are placed, and realize the static birefringent compensation of crystal, and Q impulse is carried out slicing.
5. according to one of them described system of claim 1-3, it is characterized in that, call formula: T=(t
n-t
1)/(, (n-1)/m) obtained the cycle of high repetition signal, and wherein, m is high repetition interference source number, and the time of first signal of counting Bo Mennei is t
1, the time of last signal is t
n, the sampling pulse number is n, the cycle is T.
6. according to one of them described system of claim 1-3, it is characterized in that the synchronous points of seeking reverse high repetition signal is specially: choose the synchronous points of first pulse signal of counting Bo Mennei as reverse high repetition signal.
7. the laser code method that anti-high repetition is disturbed is characterized in that, presets nanosecond pulsewidth tunable laser at laser target designator and carries out the PAWM coding; Adopt counting ripple door, gating ripple door in the target seeker signal processing; The guidance signal that contains high repetition interference signal is through gating ripple door and counting ripple door; Carry out high repetition period measurement through counting ripple door; Obtain reverse high repetition synchronizing signal, the control high frequency electronic switch is to exporting control signal through the guidance signal of gating ripple door, and counting ripple door combines the cycle of the high repetition interference signal of record measurement constantly; Confirm the starting point of reverse high repetition signal at counting Bo Mennei according to the high repetition interference signal cycle; Send and the complete reverse periodic signal of high repetition signal as synchronous points with starting point, with high repetition electronic switch of this periodic signal control, eliminate the high repetition interference signal in the composite signal again.
8. method according to claim 7; It is characterized in that said PAWM coding is specially: the electrooptical switching slicing is realized pulse duration and pulse amplitude coding, the phase difference that the ktp crystal compensation static birefringent of quadrature produces; Pockers cell power supply Synchronization Control reduces delay and error; Adjustable pulse duration and pulse amplitude are stablized in generation, and laser encoder modulating pulse width and pulse amplitude form the PAWM coding.
9. method according to claim 7 is characterized in that, calls formula: T=(t
n-t
1)/(, (n-1)/m) obtained the cycle of high repetition signal, and wherein, m is high repetition interference source number, and the time of first signal of counting Bo Mennei is t
1, last signal time be t
n, the sampling pulse number is n, the cycle is T.
10. method according to claim 7 is characterized in that, the synchronous points of seeking reverse high repetition signal is specially: choose the synchronous points of first pulse signal of counting Bo Mennei as reverse high repetition signal.
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