CN103293959B - The analogy method of space laser interference system laser guide control technology and device - Google Patents

Abstract

The invention provides a simulation method for laser pointing control technology of a space laser interference system, comprising the following steps: generating linearly polarized incident laser and local laser with controllable collimation, monochromaticity, polarization state, intensity and phase; The system modulates the direction of the incident laser light to simulate the jitter of the target signal direction; through the differential interference optical path, the incident laser light and the local laser light are converged to form a laser differential interference signal, and the photoelectric signal is converted by a four-quadrant photodetector, and simultaneously Measure the phase information of each quadrant; collect the above phase information in real time through the laser pointing control system, use the optimized adaptive PID control method to control the direction of the local laser with high precision angle, realize the strict parallelism of the two laser beams, and meet the requirements of space measurement Require. The invention adopts the phase-sensitive angle measurement method, which has higher sensitivity than the light intensity-sensitive method, and is convenient for realizing higher-precision laser pointing control.

Description

Simulation method and device for laser pointing control technology of space laser interference system

technical field

The present invention relates to a simulation method and device for the laser pointing control technology of a space laser interference system, in particular to a simulation method and device for the laser pointing control technology of a space double-star laser heterodyne interference ranging system for ground simulation experiment.

Background technique

There are currently many space exploration projects planned in Europe and the United States, such as the next-generation lunar gravitational field exploration satellite program, the Earth's advanced gravity satellite program, and the space gravitational wave detection program. my country held a special meeting to discuss how to carry out gravitational wave detection, and space gravitational wave detection has also been included in the 50-year space science plan formulated by the Chinese Academy of Sciences. At the same time, driven by the great success of the gravity satellite GRACE project, in order to catch up with the development trend of international gravity measurement, my country has also begun to explore the construction of an advanced gravity satellite system for independent intersatellite laser interferometry. Due to the high-precision requirements of space detection, all countries have adopted the intersatellite laser interferometric ranging technology as the basic methodology of signal detection on the basis of optimized comparison.

The methodology of interstellar laser interference has high requirements on the collimation of the laser, but due to the complexity of the space environment, the satellite is interfered by external factors (such as atmospheric disturbance, solar wind and solar radiation, etc.), the laser emitted by the spacecraft Jitter will occur in the outgoing direction, and this pointing error will directly affect the final ranging accuracy. The effect of pointing error on the measured phase:

in:

Phase measurement error caused by pointing error;

λ: laser wavelength;

d: wave front curvature error;

D: receiving diameter of the telescope;

θ _dc : pointing static deflection error;

δθ: Laser pointing jitter.

Reducing the wavefront curvature error can improve the ranging accuracy, but under a certain processing technology, the wavefront curvature error is a constant value. Reducing the diameter of the telescope can reduce the phase error, but it will cause the weakening of the received optical power, increase the shot noise and increase the difficulty of light detection. Improving the precision of laser pointing control is an effective way to reduce the pointing phase error.

For the advanced gravity measurement project, the distance between the two stars is about 100Km, and the orbital height is about 300-400Km. It is in a low-vacuum environment and is seriously disturbed by the atmosphere. At the same time, the disturbance of other non-conservative forces is also very complicated. According to the advanced gravitational field measurement project laser interferometric ranging accuracy requirements, in the signal frequency range of 0.1mHz-0.1Hz, the laser pointing control accuracy should be better than This requires that the laser pointing control system must have performance requirements such as large dynamic range, high control precision, and high control frequency; and for the space gravitational wave detection plan, although the gravitational wave detection satellite is in deep space and the external disturbance is small, the distance between the two stars is very large. Far away, about 1 million kilometers, the laser interference signal received by the double star is very weak, which puts higher requirements and challenges on the accuracy of laser pointing control, and needs to achieve better than Laser pointing control accuracy. Therefore, laser pointing control has become an important technical bottleneck restricting the detection of advanced gravity satellites and gravitational waves in space.

Abroad, the key technologies of space gravitational wave detection and advanced gravity measurement projects are mainly developed by the German eLISA/NGO research group. Previously, the eLISA/NGO group focused on the research fields of phase meter, laser interferometer and dragless control. The research on the laser pointing control system lagged behind and was still in the stage of computer simulation and pre-research. As a result, the upcoming LISA- None of the Path-finder satellites were able to test pointing control technology.

my country's space gravitational wave detection and advanced gravity satellite research started relatively late, and the research on the laser pointing control system for space laser precision measurement has not yet been carried out. However, the Chinese Academy of Sciences has included gravity field measurement and gravitational wave detection in the medium and long-term development plan, and plans to achieve a gravity field distribution with a spatial resolution of 100 kilometers and a magnitude of 1mGal in the next seven to ten years, and realize The space laser interferometry system with ranging accuracy will lay the foundation for future gravitational wave detection and advanced gravitational field measurement projects. However, my country's existing satellite attitude control technical indicators are Simultaneous development of laser pointing control technology is required to meet the requirements of space laser interferometric ranging. my country has accumulated a certain amount of technology in laser aiming and pointing control in the application fields of laser communication, target tracking and military use. They mostly use the imaging method or the coincidence method of the center of the four-quadrant photodetector and the center of the spot as the angle measurement methodology, and its accuracy is generally in the range of Left and right, it is far below the measurement requirements of space gravitational wave detection and advanced gravity satellites. Therefore, laser pointing control has become a technical bottleneck for my country's space gravitational wave detection and the development of advanced gravity satellites.

Contents of the invention

A technical problem to be solved by the present invention is to provide a simulation method of the laser pointing control technology of the space laser interference system, which is used for accurately performing the ground simulation experiment of the laser pointing control of the space laser interference system.

Another technical problem solved by the present invention is to provide a simulation device for the laser pointing control technology of the space laser interference system, which can realize the ground simulation experiment of the laser pointing control of the space laser interference system.

In order to solve the above problems, the present invention provides a simulation method for laser pointing control technology of a spatial laser interference system, comprising the following steps:

(a) produce collimated, monochromatic, polarization state, intensity and phase controllable linearly polarized incident laser light and local laser light;

(b) Modulating the direction of the incident laser light through the laser pointing jitter simulation system to simulate the direction jitter of the target signal;

(c) adjusting the intensity and polarization state of the incident laser light and the local laser light through a differential interference optical path, and converging the incident laser light and the local laser light to form a laser differential interference signal,

(d) Through the angle sensitive system, the photoelectric signal conversion is carried out, and the phase information of each quadrant is measured;

(e) through the laser pointing control system, collect the above-mentioned phase information in real time, and use the optimized adaptive proportional-integral-derivative control method to control the direction of the local laser with high precision and angle, so as to realize the strict parallelism of the two laser beams, and Make its pointing deviation meet the space measurement requirements.

Further, the step (a) specifically includes the following steps:

1) Turn on the 1064nm laser, and after warming up for a period of time, turn on the frequency stabilization device and the power supply of the acousto-optic frequency shifter, and the laser outputs 45-degree linearly polarized light;

2) The laser passes through the first Faraday isolator to prevent the laser from returning to the laser and affect the normal operation of the laser. After passing through the first 1/2 beam splitter, the laser is divided into two channels, and the two optical signals are respectively used as incident laser and local laser;

3) The two laser beams respectively pass through an acousto-optic frequency shifter, aperture, wedge block, piezoelectric deflection mirror, and linear polarizer. The two laser beams generate a frequency difference of 1MHz, and the interference laser is filtered out through the aperture, and the wedge plate corrects Due to the deflection of the laser direction caused by the acousto-optic frequency shifter, the linear polarizer adjusts the polarization state and intensity of the laser;

Described step (b) specifically comprises the following steps:

4) The laser pointing jitter simulator controls the first deflection drive source to regulate the first piezoelectric deflection mirror to simulate the jitter of the laser direction emitted by the remote spacecraft;

Described step (c) specifically comprises the following steps:

5) The incident laser light reaches the second 1/2 beam splitter;

6) The local laser reaches the second 1/2 beam splitter;

7) After passing through the second 1/2 beam splitter, a laser differential interference signal is formed;

Described step (d) specifically comprises the following steps:

8) The four-quadrant photodetector converts the differential optical signal into an electrical signal;

9) The four-channel phase meter accurately measures the phase information of each quadrant at the same time

Described step (e) specifically comprises the following steps:

10) The laser pointing controller calculates the phase difference between the left and right quadrants respectively Phase difference with the upper and lower quadrants Then using the calibrated phase-angle relationship (where r: the radius of the photosensitive surface of the four-quadrant photodetector; λ: the wavelength of the laser; α: the included angle of the laser), the left and right deflection angle α _yaw and the up and down deflection angle α _pitch are obtained, and the second deflection drive is adjusted through the optimized adaptive PID control The source is used to control the second piezoelectric deflecting mirror to control the angle, so as to realize the strict parallelism of the two laser beams.

The present invention also provides a simulation device for laser pointing control technology of a space laser interference system, which at least includes:

An incident laser arm for generating linearly polarized incident laser light with controllable collimation, monochromaticity, polarization state, intensity and phase;

A laser pointing jitter simulation system, which is connected to the incident laser arm and modulates the direction of the incident laser to simulate the direction jitter of the target signal;

a local laser arm for generating linearly polarized local laser light with controllable collimation, monochromaticity, polarization state, intensity and phase;

A differential interference optical path, connected to the incident laser arm and the local laser arm, for regulating the intensity and polarization state of the incident laser and the local laser, and converging the incident laser and the local laser to form a laser differential interference signal;

An angle-sensitive system, which performs photoelectric signal conversion and measures the phase information of each quadrant;

A laser pointing control system, which analyzes and processes the detected phase data, and controls the angle of the direction of the local laser to realize strict parallelism of the two laser beams, that is, pointing control.

Further, the incident laser arm includes sequentially arranged along the optical axis direction:

A 1064nm laser for generating 45-degree linearly polarized laser light with a wavelength of 1064nm;

A first Faraday isolator with an incident polarization direction of 45 degrees and an outgoing polarization direction of 90 degrees, using the Faraday effect to prevent the laser from returning to the laser and affecting the normal operation of the laser;

A first 1/2 beam splitter divides the incident laser into two paths, the light intensity is halved, and the two paths of light signals are respectively used as incident laser and local laser;

A first acousto-optic frequency shifter, which shifts the frequency of the passing laser;

A first aperture for filtering out interfering laser light;

a first wedge to correct the laser direction deflection caused by the first acousto-optic frequency shifter;

A first piezoelectric deflection mirror, composed of a piezoelectric deflection stage and a plane mirror, so that the laser light passing through the first wedge-shaped piece is reflected;

A first linear polarizer to regulate the intensity and polarization state of the outgoing laser light;

The laser pointing jitter simulation system includes:

A laser pointing jitter simulator, programmed to simulate the jitter in the incident laser direction, and adjust the first deflection drive source;

A first deflection drive source, used to receive the laser jitter modulation signal sent by the laser pointing jitter simulator, and modulate the first piezoelectric deflection mirror;

The local laser arm includes sequentially arranged along the optical axis direction:

A second acousto-optic frequency shifter to shift the frequency of the passing laser;

A first aperture for filtering out interfering laser light;

a second wedge to correct the laser direction deflection caused by the first acousto-optic frequency shifter;

A second piezoelectric deflection mirror, composed of a piezoelectric deflection stage and a plane mirror, to reflect the laser light passing through the second wedge-shaped sheet;

A second linear polarizer to adjust the output laser intensity and polarization state;

The differential interference optical path includes sequentially arranged along the optical axis direction:

A second 1/2 beam splitter, so that the laser light passing through the first linear polarizer and the laser light passing through the second linear polarizer form two differential interference laser signals after being incident on the two surfaces along 45 degrees;

The angle sensitive system includes:

A four-quadrant photodetector converts the two differential interference laser signals into electrical signals;

A four-channel high-precision digital phase meter is used to measure the phase information of each quadrant contained in the incoming electrical signal from the four-quadrant photodetector Simultaneous and precise measurements;

The laser pointing control system includes:

A laser pointing controller for collecting and storing the phase information measured by the four-channel phase meter real-time data, calculate the phase difference between the left and right quadrants respectively Phase difference with the upper and lower quadrants Then using the calibrated phase-angle relationship (where r: the radius of the photosensitive surface of the four-quadrant photodetector; λ: the wavelength of the laser; α: the included angle of the laser), the left and right deflection angle α _yaw and the up and down deflection angle α _pitch are obtained, and the angle control signal is generated by the PID control algorithm;

A second deflection driving source is used to receive the angle control signal sent by the laser pointing controller to control the second piezoelectric deflection mirror to realize strict parallelism of the two laser beams, that is, pointing control.

The advantages of the present invention are:

1) According to the laser jitter data of the space spacecraft, write the control software to control the high-precision angle of the first piezoelectric tilting stage, realize the high-precision modulation of the incident laser direction, and simulate the received information from the remote spacecraft received by the spacecraft. The incident laser direction jitters.

2) The phase-sensitive angle measurement method is adopted, which has higher sensitivity than the light intensity-sensitive method. At the same time, the method can partially eliminate the common noise of the signal and improve the precision of laser pointing control.

3) The laser pointing controller receives the high-precision phase information detected by the phase meter in real time, uses the methodology of phase-sensitive angle measurement, and uses the optimized adaptive PID feedback control method to control the high-precision angle of the second piezoelectric tilting stage , to achieve strict parallelism of the two laser beams, that is, pointing control.

Description of drawings

Fig. 1 is a simulation device diagram of the laser pointing control technology of the space laser interference system of the present invention.

Fig. 2 is a flow chart of the laser pointing shake simulation system of the present invention.

Fig. 3 is a flowchart of the laser pointing control system of the present invention.

detailed description

Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

The present invention provides a simulation device for laser pointing control technology of a space laser interference system as shown in accompanying drawing 1, comprising at least:

An incident laser arm for generating linearly polarized incident laser light with controllable collimation, monochromaticity, polarization state, intensity and phase;

A laser pointing jitter simulation system, connected to the incident laser arm, modulates the direction of the incident laser with high precision, and is used to simulate the jitter of the incident laser direction of the space spacecraft (see Figure 2);

a local laser arm for generating linearly polarized local laser light with controllable collimation, monochromaticity, polarization state, intensity and phase;

A differential interference optical path, connected to the incident laser arm and the local laser arm, for regulating the intensity and polarization state of the incident laser and the local laser, and converging the incident laser and the local laser to form a laser differential interference signal;

An angle-sensitive system, which performs photoelectric signal conversion and measures the phase information of each quadrant;

A laser pointing control system collects the above-mentioned phase information in real time, and uses the optimized adaptive proportional-integral-differential control method to control the direction of the local laser with high precision and angle, so as to realize the strict parallelism of the two laser beams and make them point The deviation meets the spatial measurement requirements.

The incident laser arm includes:

A 1064nm laser 1 for generating a 45-degree linearly polarized laser with a wavelength of 1064nm;

A first Faraday isolator 2 with an incident polarization direction of 45 degrees and an outgoing polarization direction of 90 degrees, using the Faraday effect to prevent the laser light from returning to the laser 1 and affecting the normal operation of the laser 1;

A first 1/2 beam splitter 31 divides the incident laser light into two paths, the light intensity is halved, and the two paths of light signals are respectively used as incident laser light and local laser light;

A first acousto-optic frequency shifter 41, which shifts the frequency of the passing laser light;

A first aperture 51 for filtering out interfering laser light;

A first wedge-shaped piece 61, which corrects the deflection of the laser direction caused by the frequency shift by the first acousto-optic frequency shifter 41;

A first piezoelectric deflection mirror 91, which is composed of a piezoelectric deflection stage and a plane mirror, so that the laser light passing through the first wedge-shaped piece 61 is reflected;

A first linear polarizer 111, which regulates the intensity and polarization state of the outgoing laser light;

The laser pointing jitter simulation system includes:

A laser pointing jitter simulator 71, programmed to simulate the jitter in the direction of the incident laser, and adjust the first deflection drive source;

A first deflection drive source 81, used to receive the laser jitter modulation signal sent by the laser pointing jitter simulator 71, and modulate the first piezoelectric deflection mirror 91;

The local laser arm includes sequentially arranged along the optical axis:

A second acousto-optic frequency shifter 42, which makes the laser transmitted by the first 1/2 beam splitter 31 after frequency shifting, and produces the required frequency difference with the laser light passing through the first acousto-optic frequency shifter 41;

A first aperture 51 for filtering out interfering laser light;

A second wedge-shaped piece 62 for correcting the laser direction deflection by the second acousto-optic frequency shifter 42;

A second piezoelectric deflection mirror 92, made up of a piezoelectric deflection stage and a plane mirror, to reflect the laser light passing through the second wedge-shaped piece 62;

A second linear polarizer 112, which corrects the laser polarization state, so that the outgoing laser maintains the standard 90-degree linearly polarized laser;

The differential interference optical path includes:

A second 1/2 beam splitter 32, so that the laser light passing through the first linear polarizing plate 111 and the laser light passing through the second linear polarizing plate 112 form a differential interference laser signal after being incident on the two surfaces along 45 degrees;

Angle-sensitive systems include:

A four-quadrant photodetector 12 converts the laser differential signal into an electrical signal;

A four-channel phase meter13, simultaneously and accurately measure the phase information of each quadrant of the four-quadrant photodetector

The laser pointing control system includes:

A laser pointing controller 72 for real-time acquisition of the phase information measured by the four-channel phase meter 13 Calculate the phase difference between the left and right quadrants separately Phase difference with the upper and lower quadrants Then using the calibrated phase-angle relationship (where r: the radius of the photosensitive surface of the four-quadrant photodetector 12; λ: the wavelength of the laser; α: the included angle of the laser), the left and right deflection angle α _yaw and the up and down deflection angle α _pitch are obtained, namely The angle control signal is generated by an optimized adaptive PID control algorithm (see Figure 3);

A second deflection drive source 82 is used to receive the angle control signal from the laser pointing controller 72 to control the second piezoelectric deflection mirror 92 to realize the strict parallelism of the two laser beams, that is, pointing control.

The specific operation steps are:

1) Turn on the 1064nm laser 1, turn on the frequency stabilization device and the power supply of the acousto-optic frequency shifter after warming up for a period of time, and the laser outputs 45-degree linearly polarized light;

2) The laser passes through the first Faraday isolator 2 to prevent the laser from returning to the laser and affect the normal operation of the laser. After passing through the first 1/2 beam splitter 31, the laser is divided into two paths, and the two optical signals are respectively used as incident laser and local laser;

3) The two laser beams respectively pass through an acousto-optic frequency shifter, aperture, wedge block, piezoelectric deflection mirror, and linear polarizer. The frequency difference between the two laser beams is 1MHz, and the interference laser is filtered out by the aperture, and the wedge plate corrects Due to the deflection of the laser direction caused by the acousto-optic frequency shifter, the linear polarizer adjusts the polarization state and intensity of the laser;

4) The laser pointing jitter simulator 71 controls the first deflection drive source 81 to regulate the first piezoelectric yaw mirror 91 to simulate the jitter in the direction of the laser emitted by the remote spacecraft;

5) The incident laser light reaches the second 1/2 beam splitter 32;

6) The local laser light reaches the second 1/2 beam splitter 32;

7) After passing through the second 1/2 beam splitter 32, a differential interference laser signal is formed;

8) The four-quadrant photodetector 12 converts the differential optical signal into an electrical signal;

9) The four-channel phase meter 13 accurately measures the phase information of each quadrant at the same time

10) The laser pointing controller 72 calculates the phase difference between the left and right quadrants respectively Phase difference with the upper and lower quadrants Then using the calibrated phase-angle relationship (where r: the radius of the photosensitive surface of the four-quadrant photodetector; λ: the wavelength of the laser; α: the included angle of the laser), the left and right deflection angle α _yaw and the up and down deflection angle α _pitch are obtained, and the second deflection drive is adjusted through the optimized adaptive PID control The source 82 controls the second piezoelectric deflection mirror 92 to perform high-precision angle control, so that the two laser beams are strictly parallel, and the pointing deviation meets the requirements of space measurement.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (2)

1. an analogy method for space laser interference system laser guide control technology, is characterized in that, comprise the steps:

A () produces the controlled linear polarization incident laser of collimation, monochrome, polarization state, intensity and phase place and local laser;

B (), by laser guide jitter simulation system, modulates described incident laser direction, be used for simulated target sense shake;

C (), by differential interferometry light path, regulates and controls the intensity of incident laser and local laser and polarization state, and described incident laser and described local laser are converged and form laser differential interference signal,

D (), by angular-sensitive system, carries out photoelectric signal transformation, measure the phase information of each quadrant;

E () is by laser guide control system, the above-mentioned phase information of Real-time Collection, utilize the self-adaptation proportional integral differential control method optimized, High-precision angle control is carried out to the direction of described local laser, realize the perfect parallelism of two bundle laser, and make it point to deviation meeting spatial measurement requirement;

Described step (a) specifically comprises the steps:

1) open 1064nm laser instrument, open frequency regulator and acousto-optic frequency shifters power supply after the preheated one-section time, laser instrument exports 45 degree of linearly polarized lights;

2) laser is through the first faraday isolator, and prevent laser return laser light device, affect laser instrument and normally work, through the one 1/2 spectroscope, laser is divided into two-way, and two ways of optical signals is respectively as incident laser and local laser;

3) two-way laser is separately respectively through an acousto-optic frequency shifters, diaphragm, wedged plate, piezoelectricity beat mirror, linear polarizer, two-way laser produces frequency difference 1MHz, by diaphragm filtering interfering laser, wedged plate corrects the laser direction deflection because acousto-optic frequency shifters causes, and linear polarizer regulates laser polarization state and intensity;

Described step (b) specifically comprises the steps:

4) laser guide jitter simulation device controls the first deflection driven source and regulates and controls the first piezoelectricity beat mirror, simulates the shake of the laser direction of being come by far-end Spacecraft Launch;

Described step (c) specifically comprises the steps:

5) incident laser arrives the 2 1/2 spectroscope;

6) local laser arrives the 2 1/2 spectroscope;

7) after the 2 1/2 spectroscope, laser differential interference signal is formed;

Described step (d) specifically comprises the steps:

8) four-quadrant photo detector transfers laser differential interference signal to electric signal;

9) phase information of each quadrant accurately measured by four-way phasometer simultaneously

Described step (e) specifically comprises the steps:

10) laser guide controller calculates left and right quadrant phase differential respectively with upper lower quadrant phase differential then phase place-angular relationship is utilized wherein r: four-quadrant photo detector photosurface radius; λ: optical maser wavelength; α: laser angle, obtains deflection angle α _yawwith upper and lower angle of deflection _pitch, regulate the second deflection driven source by the self-adaptation proportional integral differential control optimized, the second piezoelectricity beat mirror controlled, carries out Angle ambiguity, realize the perfect parallelism of two bundle laser.

2. an analogue means for space laser interference system laser guide control technology, is characterized in that, at least comprise:

One incident laser arm, for generation of the linear polarization incident laser that collimation, monochrome, polarization state, intensity and phase place are controlled;

One laser guide jitter simulation system, is connected with described incident laser arm, modulates described incident laser direction, be used for simulated target sense shake;

One local laser arm, for generation of the local laser of the linear polarization that collimation, monochrome, polarization state, intensity and phase place are controlled;

One differential interferometry light path, is connected with described incident laser arm and described local laser arm, for regulating and controlling the intensity of incident laser and local laser and polarization state, and described incident laser and described local laser is converged and forms laser differential interference signal;

One angular-sensitive system, carries out photoelectric signal transformation, measures the phase information of each quadrant;

One laser guide control system, carries out analyzing and processing to the phase data detected, and carries out Angle ambiguity to the direction of described local laser, realizes the perfect parallelism of two bundle laser, namely points to control;

Described incident laser arm comprises and setting gradually along optical axis direction:

A 1064nm laser instrument is 1064nm45 degree linearly polarized laser for generation of wavelength;

First faraday isolator, incident polarization direction is 45 degree, and outgoing polarization direction is 90 degree, utilizes Faraday effect, prevents laser return laser light device, affects laser instrument and normally work;

One 1/2 spectroscope, be divided into two-way after making laser incidence, light intensity reduces by half, and two ways of optical signals is respectively as incident laser and local laser;

A first sound optical frequency shifter, carries out shift frequency to institute through laser;

First diaphragm, for filtering interfering laser;

First wedged plate, corrects the laser direction deflection caused by first sound optical frequency shifter;

A first piezoelectricity beat mirror, is made up of piezoelectricity beat platform and level crossing, and the laser through described first wedged plate is reflected;

First linear polarizer, regulation and control shoot laser intensity and polarization state;

Described laser guide jitter simulation system comprises:

A laser guide jitter simulation device, the shake of programming simulation incident laser direction, and regulate and control the first deflection driven source;

A first deflection driven source, for receiving the laser dithering modulation signal that described laser guide jitter simulation device sends, modulates described first piezoelectricity beat mirror;

Described local laser arm comprises and setting gradually along optical axis direction:

A second sound optical frequency shifter, carries out shift frequency to institute through laser;

First diaphragm, for filtering interfering laser;

Second wedged plate, corrects the laser direction deflection caused by first sound optical frequency shifter;

A second piezoelectricity beat mirror, is made up of piezoelectricity beat platform and level crossing, makes the laser reflection through described second wedged plate;

Second linear polarizer, regulation and control shoot laser intensity and polarization state;

Described differential interferometry light path comprises and setting gradually along optical axis direction:

2 1/2 spectroscope, makes the laser after described first linear polarizer and after 45 degree of incidences, forms two-pass DINSAR from two surfaces through the laser of described second linear polarizer to interfere laser signal;

Described angular-sensitive system comprises:

A four-quadrant photo detector, makes described two-pass DINSAR interfere laser signal to be converted into electric signal;

A four-way phasometer, for the phase information to each quadrant comprised in the electric signal imported into from described four-quadrant photo detector accurately measure the while of carrying out;

Described laser guide control system comprises:

A laser guide controller, for gathering, storing described four-way phasometer and survey phase information real time data, calculate left and right quadrant phase differential respectively with upper lower quadrant phase differential then phase place-angular relationship is utilized wherein r: four-quadrant photo detector photosurface radius; λ: optical maser wavelength; α: laser angle, obtains deflection angle α _yawwith upper and lower angle of deflection _pitch, passing ratio-Integrated Derivative control algolithm generates angle control signal;

A second deflection driven source, for receiving the described angle control signal that described laser guide controller sends, controlling described second piezoelectricity beat mirror, realizing the perfect parallelism of two bundle laser, namely point to control.