CN108933629A - A kind of semiactive homing laser water printing guiding method of more sub-light beam interferometers - Google Patents

A kind of semiactive homing laser water printing guiding method of more sub-light beam interferometers Download PDF

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Publication number
CN108933629A
CN108933629A CN201810588978.2A CN201810588978A CN108933629A CN 108933629 A CN108933629 A CN 108933629A CN 201810588978 A CN201810588978 A CN 201810588978A CN 108933629 A CN108933629 A CN 108933629A
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laser
light
splitter
sub
formula
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CN108933629B (en
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傅超
尚佩瑾
吴梦瑶
王石语
蔡德芳
李兵斌
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Xidian University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/503—Laser transmitters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2209/00—Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
    • H04L2209/60—Digital content management, e.g. content distribution
    • H04L2209/608—Watermarking

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optics & Photonics (AREA)
  • Optical Radar Systems And Details Thereof (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

The present invention relates to a kind of laser guidance method, especially a kind of semiactive homing laser water of more sub-light beam interferometers prints guiding method, includes at least:Laser, optical beam-splitter, photelectric receiver, the output light of laser is beamed into multi beam directional light through optical beam-splitter, multi beam directional light forms interference field in space, photelectric receiver carries out image checking to the interference field intensity signal formed at target, detection information is analyzed, and be compared with space interference field mould shape, it is exported according to comparison result.There is provided one kind has high identification, and the semiactive homing laser water of more sub-light beam interferometers of high anti-jamming capacity is printed guiding method, spatial domain watermark encoding characteristics combined with time domain coding characteristic, in order to provide laser-guided safety.

Description

A kind of semiactive homing laser water printing guiding method of more sub-light beam interferometers
Technical field
The present invention relates to a kind of laser guidance method, especially a kind of semiactive homing laser water printing of more sub-light beam interferometers Guiding method.
Background technique
Laser semi-active homing guidance weapon has attack precision high, and military use is wide, and structure is simple and direct, at low cost etc. excellent Point is key player indispensable in modern war.Laser semi-active homing guidance system is by encoding controllable laser eyepiece Laser seeker forms on indicator and bullet, and the laser beam with encoding characteristics is irradiated to object table by laser target designator At face, laser seeker is decoded identification to the laser signal received, and then implements to hit to target.It can be seen that swashing Pumped FIR laser technology is the key that laser guidance technique, and the purpose is to guarantee that under war condition complicated and changeable, laser weapon can be with Accurate capture target simultaneously is implemented to hit, and the strategic requirement of multiple target while strike can also be met in same war environment.
Existing laser code mode mainly has：Preiodic type coding, equal difference type coding, pseudorandomcode and pulsewidth are compiled Code etc..The common point of these coding modes is that coding has regularity, and enemy can be using laser Deception Jamming System to using upper The semiactive guidance weapon for stating coding mode is interfered, which can be in a short time to laser code signal Identification duplication is carried out, and then is emitted on the laser signal to decoy with identical coding mode in advance by jammer, causes to make Weapon failure is led, the battlefield survival of semiactive guidance weapon is reduced.
Summary of the invention
The object of the present invention is to provide one kind to have high identification, and more sub-light beam interferometers of high anti-jamming capacity are partly actively sought Laser water print guiding method, spatial domain watermark encoding characteristics are combined with time domain coding characteristic, in order to provide laser-guided Safety.
The object of the present invention is achieved like this, a kind of more semiactive homing laser waters printing guiding methods of sub-light beam interferometer, It includes at least:Laser, optical beam-splitter, photelectric receiver, it is flat that the output light of laser through optical beam-splitter is beamed into multi beam Row light, multi beam directional light space formed interference field, photelectric receiver at target formed interference field intensity signal carry out at As detection, detection information is analyzed, and is compared with space interference field mould shape, is exported according to comparison result.
The optical beam-splitter be one into three go out beam splitter, three go out beam splitter light path having the same.
The optical beam-splitter be one into four go out beam splitter, four go out beam splitter light path having the same.
The optical beam-splitter be one into five go out beam splitter, five go out beam splitter light path having the same.
Multi beam directional light forms interference field in space and indicates by following distribution function：
C is invariant in formula, and P is laser general power, shown in the calculation formula of remaining each symbol such as following formula (2)
θ is far-field divergence angle, w0It is the waist radius of fundamental-mode gaussian beam, f is the confocal parameter of Gaussian beam, and R (z) is The radius of curvature of the Gaussian beam equiphase surface of z point is intersected at propagation axis, w (z) is the height that z point is intersected at propagation axis Spot radius on this light beam equiphase surface.
When more beamlet coherent transmittings, if the centre coordinate of n-th of beamlet is (xnn,ynn), beamlet transmitting swashs Shown in optical electric field distribution function such as formula (3) of the light light beam at target surface
Shown in total photoelectricity field distribution such as formula (4) at target surface
Distribution of light intensity at target surface is distributed as shown in formula (5)
I (x, y, z)=E (x, y, z) E*(x,y,z) (5)
Shown in total power profile such as formula (6) at target surface
PAlways=∫ ∫ I (x, y, z) dxdy (6).
The laser includes a coded modulation control unit, for exporting a scrambled light beam.
It is an advantage of the invention that：Make laser facula that there is specific spatial distribution using the space interference effect of beamlet, This spatial distribution increases guidance signal by one layer of laser watermark " key ", laser seeker on the basis of existing sequential coding " enemy and we " identification can be carried out to echo-signal according to this watermark " key ".Due to more sub-lights in laser water printing guiding systems Beam derives from same laser light source, has good spatial coherence, so that laser spatial watermark effect has high identification, it is high Anti-interference ability, laser seeker quickly accurately find target according to preset solution code instruction and implement to hit.
Detailed description of the invention
Below with reference to embodiment attached drawing, invention is further explained:
Fig. 1 is that three seed light sources distribution working principle is led in laser water printing；Wherein, Fig. 1 a is three idea beam splitter sides Formula；Fig. 1 b is four idea beam splitter modes；Fig. 1 c is five idea beam splitter modes；
The light distribution of Fig. 2 target surface；Wherein, Fig. 2 a is three idea beam distributions；Fig. 2 b is four idea beam distributions； Fig. 2 c is five idea beam distributions；
Fig. 3 is the light distribution of x-axis direction.
In figure, 1, laser；2, optical beam-splitter；3, photelectric receiver；4, timing sequencer.
Specific embodiment
Embodiment 1
As shown in Figure 1a, a kind of semiactive homing laser water of more sub-light beam interferometers prints guiding method, includes at least:Laser 1, the output light of optical beam-splitter 2, photelectric receiver 3, laser 1 is beamed into three beams directional light through optical beam-splitter 2, and three go out to divide Beam device light path having the same, three beams directional light form interference field in space, and photelectric receiver 3 is to the interference field formed at target Intensity signal carries out image checking, analyzes detection information, and be compared with space interference field mould shape, and foundation compares knot Fruit is exported.
As shown in Figure 2 a, three beams directional light forms interference field in space and indicates by following distribution function：
C is invariant in formula, and P is laser general power, shown in the calculation formula of remaining each symbol such as following formula (2)
θ is far-field divergence angle, w0It is the waist radius of fundamental-mode gaussian beam, f is the confocal parameter of Gaussian beam, and R (z) is The radius of curvature of the Gaussian beam equiphase surface of z point is intersected at propagation axis, w (z) is the height that z point is intersected at propagation axis Spot radius on this light beam equiphase surface.
When three beamlet coherent transmittings, if the centre coordinate of n-th of beamlet is (xnn,ynn), beamlet transmitting swashs Shown in optical electric field distribution function such as formula (3) of the light light beam at target surface
Shown in total photoelectricity field distribution such as formula (4) at target surface
Distribution of light intensity at target surface is distributed as shown in formula (5)
I (x, y, z)=E (x, y, z) E*(x,y,z) (5)
Shown in total power profile such as formula (6) at target surface
PAlways=∫ ∫ I (x, y, z) dxdy (6).
As shown in Figure 1, laser 1 chooses 1064nmNd:YAG laser, pump power 1kW, laser space propagation away from From for 10km, it is fixed value 7mm that beamlet spacing d, which is arranged, in second level code generator, by level encoder generator determine three kinds not With more sub-light light source beam arrangement modes, calculates separately interference pattern distribution of light intensity at target surface and be distributed.
By a, b, c of Fig. 2 it is found that different coding modes causes sub-light light source beam arrangement mode to change, object table The interference pattern that face is formed changes therewith.Difference is obvious between pattern, has high identification.The interference master that different arrangement modes are formed Peak intensity variation is obvious, compares the light distribution in x-axis direction under different arrangement modes, is illustrated in fig. 3 shown below.
Embodiment 2
As shown in Figure 1 b, a kind of semiactive homing laser water of more sub-light beam interferometers prints guiding method, includes at least:Laser 1, the output light of optical beam-splitter 2, timing sequencer 4, photelectric receiver 3 and target, laser 1 is divided through optical beam-splitter 2 Shu Chengsi beam directional light, four go out beam splitter light path having the same, and four beam directional lights form interference field in space, occur through timing The guidance signal that sequential coding information forms time-space domain fusion, interference of the photelectric receiver 3 to being formed at target are carried after device 4 Field intensity signal carries out image checking, analyzes detection information, and be compared with space interference field mould shape, and foundation compares As a result it is exported.
As shown in Figure 2 b, four beam directional lights form interference field in space and indicate by following distribution function：
C is invariant in formula, and P is laser general power, shown in the calculation formula of remaining each symbol such as following formula (2)
θ is far-field divergence angle, w0It is the waist radius of fundamental-mode gaussian beam, f is the confocal parameter of Gaussian beam, and R (z) is The radius of curvature of the Gaussian beam equiphase surface of z point is intersected at propagation axis, w (z) is the height that z point is intersected at propagation axis Spot radius on this light beam equiphase surface.
When four beamlet coherent transmittings, if the centre coordinate of n-th of beamlet is (xnn,ynn), beamlet transmitting swashs Shown in optical electric field distribution function such as formula (3) of the light light beam at target surface
Shown in total photoelectricity field distribution such as formula (4) at target surface
Distribution of light intensity at target surface is distributed as shown in formula (5)
I (x, y, z)=E (x, y, z) E*(x,y,z) (5)
Shown in total power profile such as formula (6) at target surface
PAlways=∫ ∫ I (x, y, z) dxdy (6).
It is same as Example 1, as shown in Figure 1, laser 1 chooses 1064nmNd:YAG laser, pump power 1kW, Laser space propagation distance is 10km, and it is fixed value 7mm that beamlet spacing d, which is arranged, in second level code generator, is sent out by level encoder Raw device determines four kinds of differences, four sub-light light source beam arrangement mode, calculates separately interference pattern distribution of light intensity at target surface and is distributed.
By Fig. 2 a, 2b, 2c it is found that different coding modes causes sub-light light source beam arrangement mode to change, object table The interference pattern that face is formed changes therewith.Difference is obvious between pattern, has high identification.The interference master that different arrangement modes are formed Peak intensity variation is obvious, compares the light distribution in x-axis direction under different arrangement modes, is illustrated in fig. 3 shown below.
Embodiment 3
As illustrated in figure 1 c, a kind of semiactive homing laser water of more sub-light beam interferometers prints guiding method, includes at least:Laser 1, optical beam-splitter 2, timing sequencer 4, photelectric receiver 3 and target, laser 1 are defeated through 4 scrambled of timing sequencer Out, scrambled output light is through 2 beam splitting of optical beam-splitter, and beam splitter light path having the same, the output light of laser 1 is through optics Beam splitter 2 is beamed into five beam directional lights, and five go out beam splitter light path having the same, and five beam directional lights form interference field in space, Carried after timing sequencer 4 sequential coding information formed time-space domain fusion guidance signal, photelectric receiver 3 to target at The interference field intensity signal of formation carries out image checking, analyzes detection information, and compared with space interference field mould shape Compared with foundation comparison result is exported.
As shown in Figure 2 c, five beam directional lights form interference field in space and indicate by following distribution function：
C is invariant in formula, and P is laser general power, shown in the calculation formula of remaining each symbol such as following formula (2)
θ is far-field divergence angle, w0It is the waist radius of fundamental-mode gaussian beam, f is the confocal parameter of Gaussian beam, and R (z) is The radius of curvature of the Gaussian beam equiphase surface of z point is intersected at propagation axis, w (z) is the height that z point is intersected at propagation axis Spot radius on this light beam equiphase surface.
When five beamlet coherent transmittings, if the centre coordinate of n-th of beamlet is (xnn, ynn), beamlet transmitting swashs Shown in optical electric field distribution function such as formula (3) of the light light beam at target surface
Shown in total photoelectricity field distribution such as formula (4) at target surface
Distribution of light intensity at target surface is distributed as shown in formula (5)
I (x, y, z)=E (x, y, z) E*(x, y, z) (5)
Shown in total power profile such as formula (6) at target surface
PAlways=∫ ∫ I (x, y, z) dxdy (6).
Embodiment 3 is identical as embodiment 1 and embodiment 2, as shown in Figure 1, laser chooses 1064nmNd:YAG laser, Pump power is 1kW, and laser space propagation distance is 10km, and it is fixed value that beamlet spacing d, which is arranged, in second level code generator 7mm determines different five sub-light light source beam arrangement modes by level encoder generator, calculates separately interference pattern light at target surface Field intensity distribution.
By Fig. 2 c it is found that different coding modes causes sub-light light source beam arrangement mode to change, target surface is formed Interference pattern change therewith.Difference is obvious between pattern, has high identification.The interference main peak intensity that different arrangement modes are formed Variation is obvious, compares the light distribution in x-axis direction under different arrangement modes, is illustrated in fig. 3 shown below.
Ordinate I/I in the present inventionmIndicate the ratio of more beamlet x-axis direction light intensity and single light source central light strength, I1、 I2, I3Respectively indicate 3 points of equilateral arrangements, the arrangement of four point Founders, five point Founder arrangement modes.
It can be observed that interference main peak peak value is N times of single light source launching centre intensity from Fig. 3, N is more beamlets Number.Its reason is that central light strength is ImLaser beam be divided into N beam by beamlet is equicohesive, the light intensity of beamlet at this time For Im/ N, it is N that beamlet, which interferes effect interference main peak intensity in target surface,2(Im/ N), i.e. NIm.Swashed using more beamlets The laser beam intensity that light-composited film coding mode can emit laser designator improves N times, this characteristic can be used as laser and lead Leader solution code instruction, and the atmosphere penetration capacity of laser beam is greatly improved, the laser signal for reflecting target is easier The detector being directed in head receives.
Photelectric receiver 3 is a 4 quadrant detector, using dot matrix way, such as 8*8 planar array detector, planar array detector The twofold detection to echo-signal encoding characteristics and watermark properties may be implemented.

Claims (6)

1. a kind of semiactive homing laser water of more sub-light beam interferometers prints guiding method, it is characterized in that：It includes at least:Laser, light Beam splitter, photelectric receiver are learned, the output light of laser is beamed into multi beam directional light through optical beam-splitter, and multi beam directional light is in sky Between form interference field, photelectric receiver carries out image checking to the interference field intensity signal formed at target, to detection information into Row analysis, and be compared with space interference field mould shape, it is exported according to comparison result；
When more beamlet coherent transmittings, if the centre coordinate of n-th of beamlet is (xnn,ynn), the laser light of beamlet transmitting Shown in optical electric field distribution function such as formula (3) of the beam at target surface
C is invariant in formula, and P is laser general power, and N is beamlet number, w0It is the waist radius of fundamental-mode gaussian beam, k is Wave number, f are the confocal parameters of Gaussian beam, and R (z) is the curvature that the Gaussian beam equiphase surface of z point is intersected at propagation axis Radius, w (z) are the spot radius on the Gaussian beam equiphase surface for intersect at z point with propagation axis.
Shown in total photoelectricity field distribution such as formula (4) at target surface
Distribution of light intensity at target surface is distributed as shown in formula (5)
I (x, y, z)=E (x, y, z) E*(x,y,z) (5)
Shown in total power profile such as formula (6) at target surface
PAlways=∫ ∫ I (x, y, z) dxdy (6).
2. a kind of more semiactive homing laser waters of sub-light beam interferometer according to claim 1 print guiding method, it is characterized in that： The optical beam-splitter be one into three go out beam splitter, three go out beam splitter light path having the same.
3. a kind of more semiactive homing laser waters of sub-light beam interferometer according to claim 1 print guiding method, it is characterized in that： The optical beam-splitter be one into four go out beam splitter, four go out beam splitter light path having the same.
4. a kind of more semiactive homing laser waters of sub-light beam interferometer according to claim 1 print guiding method, it is characterized in that： The optical beam-splitter be one into five go out beam splitter, five go out beam splitter light path having the same.
5. a kind of more semiactive homing laser waters of sub-light beam interferometer according to claim 1 print guiding method, it is characterized in that： Multi beam directional light forms interference field in space and indicates by following distribution function：
C is invariant in formula, and P is laser general power, shown in the calculation formula of remaining each symbol such as following formula (2)
θ is far-field divergence angle, w0It is the waist radius of fundamental-mode gaussian beam, f is the confocal parameter of Gaussian beam, and R (z) is and biography The radius of curvature that axis intersects at the Gaussian beam equiphase surface of z point is broadcast, w (z) is the Gauss light that z point is intersected at propagation axis Spot radius on beam equiphase surface.
6. a kind of more semiactive homing laser waters of sub-light beam interferometer according to claim 1 print guiding method, it is characterized in that： Including a timing sequencer, laser is exported through timing sequencer scrambled, and scrambled output light is through optical beam-splitter Beam splitting, beam splitter light path having the same carry the system that sequential coding information forms time-space domain fusion after timing sequencer Lead signal.
CN201810588978.2A 2018-06-08 2018-06-08 Multi-sub-beam interference semi-active seeking laser watermark guidance method Active CN108933629B (en)

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