CN114526634A - Continuous wave semi-active laser seeker system - Google Patents
Continuous wave semi-active laser seeker system Download PDFInfo
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- CN114526634A CN114526634A CN202210163777.4A CN202210163777A CN114526634A CN 114526634 A CN114526634 A CN 114526634A CN 202210163777 A CN202210163777 A CN 202210163777A CN 114526634 A CN114526634 A CN 114526634A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41G—WEAPON SIGHTS; AIMING
- F41G3/00—Aiming or laying means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
Abstract
The invention discloses a continuous wave semi-active laser seeker system, belongs to the technical field of guidance of laser homing, and aims to solve the problems of low power, low energy utilization rate and low efficiency of the conventional semi-active laser seeker. It includes: the continuous laser transmits continuous laser with coded information, a target performs diffuse reflection on the laser, an optical system receives the laser, the center of a light spot is converged at the center position of a four-quadrant detector, a signal processing circuit obtains echo information of each quadrant, echo amplitude values of the four quadrants are obtained through calculation according to the coded information contained in the echo signals, the center position of the light spot is obtained through calculation according to the echo amplitude values of the four quadrants, and then the deviation angle of the semi-active laser seeker relative to the target is obtained through solving. The invention is used for laser guided weapons.
Description
Technical Field
The invention relates to a continuous wave semi-active laser seeker system, and belongs to the technical field of guidance of laser homing.
Background
The laser guidance weapon has the advantages of high guidance precision, strong anti-interference capability, simple structure, low cost and the like, is an accurate guidance system, is easy to combine with other guidance systems, and is widely applied to various weapon equipment. The active laser guidance technology in the laser guidance weapon is not mature enough, and semi-active laser guidance is a mature accurate guidance system. The laser seeker is used as a core component of semi-active laser guidance, and has the functions of capturing and tracking a specific laser signal and finishing the guidance of a weapon to accurately strike a target object. The working mode of the semi-active laser seeker is as follows: the ground or airborne laser emits laser to irradiate a target, after a laser signal is subjected to diffuse reflection on the target, a light spot is converged on a four-quadrant detector through an optical system of a seeker, the position of the light spot on the detector is judged according to the signal amplitude of photoelectric conversion of each quadrant, the deviation angle of the target relative to the central optical axis of the seeker is obtained, the flight angle of the missile is corrected, and the purpose of accurate guidance is achieved.
The prior semi-active laser seeker adopts a pulse laser as a light source, and is blank in the aspect of semi-active laser seeker accurate guidance technology using a continuous laser as a light source. For a traditional pulse laser light source, the width of a single laser pulse of a laser is very small, the laser works once every certain time within the range of a few nanoseconds to a few tens of nanoseconds, although the peak power of the pulse is very high, the average power is low due to the long working interval, and the energy utilization rate is low. Therefore, in use, a large peak power is required for the purpose of remote detection, which results in a relatively large volume of the laser and is not easy to carry.
Disclosure of Invention
The invention aims to solve the problems of low power, low energy utilization rate and low efficiency of the existing semi-active laser seeker, and provides a continuous wave semi-active laser seeker system.
The invention relates to a continuous wave semi-active laser seeker system, which comprises: the device comprises a radio frequency signal source, a continuous laser, an upper computer, a semi-active laser seeker and a two-dimensional moving platform;
the semi-active laser seeker comprises an optical system, a four-quadrant detector, a trans-impedance amplifier, a pre-amplification circuit, an AD sampling circuit and a signal processing circuit;
a radio frequency signal source circularly sends out a pseudorandom M sequence which is used as a trigger signal to trigger a continuous laser to emit continuous laser with coded information, the continuous laser irradiates a target, and the target diffusely reflects the continuous laser;
an optical window of the semi-active laser seeker is opposite to a target, the semi-active laser seeker is installed on a two-dimensional moving platform, and the transverse moving direction and the longitudinal moving direction of the two-dimensional moving platform are both vertical to the normal direction of the target;
the optical system is arranged at the front end of the semi-active laser seeker and used for receiving laser diffusely reflected by the target, filtering stray light, and converging the spot center of the laser at the center position of the four-quadrant detector after the stray light is filtered;
the four-quadrant detector converts the optical signal into a current signal, and then outputs the current signal to the trans-impedance amplifier;
the trans-impedance amplifier amplifies the current signal, converts the current signal into a voltage signal and outputs the voltage signal to the pre-amplification circuit;
the pre-amplification circuit amplifies the voltage signal and outputs the amplified voltage signal to the AD sampling circuit;
the AD sampling circuit samples the voltage signal, converts an analog signal obtained by sampling into a digital signal, and then sends the digital signal to the signal processing circuit;
the signal processing circuit processes the acquired digital signals to acquire echo information of each quadrant and outputs the acquired echo information of each quadrant to an upper computer;
and the upper computer solves and obtains the deflection angle of the semi-active laser seeker relative to the target according to the coding information contained in the echo signal.
Preferably, it further comprises a mobile station controller and a mobile station control computer;
the mobile station control computer sends a control signal to the mobile station controller;
the mobile station controller controls the transverse moving position and the longitudinal moving position of the two-dimensional mobile station according to the control signal;
the spot center of the laser received by the optical system is converged at the center position of the four-quadrant detector by controlling the transverse position and the longitudinal position of the two-dimensional mobile platform.
Preferably, it also comprises a test stand; the radio frequency signal source, the continuous laser, the upper computer, the semi-active laser seeker, the two-dimensional moving table, the moving table controller and the moving table control computer are all arranged on the test bed.
Preferably, the specific method for solving and obtaining the deflection angle of the semi-active laser seeker relative to the target by the upper computer according to the coding information contained in the echo signal includes:
firstly, calculating to obtain echo amplitudes of four quadrants;
then, calculating according to the echo amplitude values of the four quadrants to obtain the central position of the light spot;
and finally, calculating according to the central position of the light spot to obtain the deflection angle of the semi-active laser seeker relative to the target.
Preferably, the specific method for obtaining the echo amplitudes of the four quadrants by calculation is as follows:
and (3) carrying out shift multiplication on the echo signal of each quadrant and a known coded continuous wave sequence, and then adding the echo signals to obtain an echo curve, wherein the peak value of the echo curve is the echo amplitude.
Preferably, the specific method for obtaining the central position of the light spot by calculating the echo amplitude values of the four quadrants includes:
center position O (x, y) of the spot:
wherein k denotes a scaling factor, U1、U2、U3And U4Respectively representing the echo peaks of the four quadrants.
Preferably, the specific method for obtaining the deflection angle of the semi-active laser seeker relative to the target through calculation according to the central position of the light spot includes:
declination angle θ of semi-active laser seeker relative to target:
the invention has the advantages that: the invention provides a continuous wave semi-active laser seeker system, which adopts a continuous laser as a light source, determines the center of a light spot converged on a four-quadrant detector by detecting the amplitude of each quadrant echo of the four-quadrant detector, can efficiently detect the angle of deviation of an optical axis of a seeker and a target, and guides a missile to fly to the target. The energy utilization rate is higher, the irradiator volume is smaller, and the performance of the semi-active laser seeker system is effectively improved.
Drawings
FIG. 1 is a schematic diagram of a continuous wave semi-active laser seeker system according to the present invention;
fig. 2 is a schematic block diagram of a semi-active laser seeker according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
Example 1:
the present embodiment will be described below with reference to fig. 1 and 2.
It includes: the device comprises a radio frequency signal source 2, a continuous laser 3, an upper computer 4, a semi-active laser seeker 5 and a two-dimensional mobile platform 6;
the semi-active laser seeker 5 comprises an optical system 10, a four-quadrant detector 11, a trans-impedance amplifier 12, a pre-amplification circuit 13, an AD sampling circuit 14 and a signal processing circuit 15;
the radio frequency signal source 2 circularly sends out a pseudorandom M sequence which is used as a trigger signal to trigger the continuous laser 3 to emit continuous laser with coded information, the continuous laser irradiates the target 9, and the target 9 performs diffuse reflection on the continuous laser;
an optical window of the semi-active laser seeker 5 faces the target 9, the semi-active laser seeker 5 is installed on the two-dimensional moving platform 6, and the transverse moving direction and the longitudinal moving direction of the two-dimensional moving platform 6 are both perpendicular to the normal direction of the target 9;
the optical system 10 is arranged at the front end of the semi-active laser seeker 5 and used for receiving laser diffusely reflected by the target 9, filtering stray light, and converging the center of a light spot of the laser after the stray light is filtered at the center of the four-quadrant detector 11;
the four-quadrant detector 11 converts the optical signal into a current signal, and then outputs the current signal to the transimpedance amplifier 12;
the transimpedance amplifier 12 amplifies the current signal, converts the current signal into a voltage signal, and outputs the voltage signal to the preamplifier circuit 13;
the preamplifier circuit 13 amplifies the voltage signal, and outputs the amplified voltage signal to the AD sampling circuit 14;
the AD sampling circuit 14 samples the voltage signal, converts an analog signal obtained by the sampling into a digital signal, and then sends the digital signal to the signal processing circuit 15;
the signal processing circuit 15 processes the acquired digital signals to obtain echo information of each quadrant, and outputs the obtained echo information of each quadrant to the upper computer 4;
and the upper computer 4 solves and obtains the deflection angle of the semi-active laser seeker 5 relative to the target 9 according to the coding information contained in the echo signal.
It also includes a mobile station controller 7 and a mobile station control computer 8;
the mobile station control computer 8 sends a control signal to the mobile station controller 7;
the mobile station controller 7 controls the transverse movement position and the longitudinal movement position of the two-dimensional mobile station 6 according to the control signal;
the spot center of the laser received by the optical system 10 is converged at the center position of the four-quadrant detector 11 by controlling the lateral position and the longitudinal position of the two-dimensional moving stage 6.
It also comprises a test bed 1; the radio frequency signal source 2, the continuous laser 3, the upper computer 4, the semi-active laser seeker 5, the two-dimensional moving platform 6, the moving platform controller 7 and the moving platform control computer 8 are all installed on the test bed 1.
Further, the specific method for solving and obtaining the deflection angle of the semi-active laser seeker 5 relative to the target 9 by the upper computer 4 according to the coding information contained in the echo signal includes:
firstly, calculating to obtain echo amplitudes of four quadrants;
then, calculating according to the echo amplitude values of the four quadrants to obtain the central position of the light spot;
and finally, calculating and obtaining the deflection angle of the semi-active laser guide head 5 relative to the target 9 according to the central position of the light spot.
Still further, the specific method for obtaining the echo amplitudes of the four quadrants by calculation is as follows:
and (3) carrying out shift multiplication on the echo signal of each quadrant and a known coded continuous wave sequence, and then adding the echo signals to obtain an echo curve, wherein the peak value of the echo curve is the echo amplitude.
Still further, the specific method for obtaining the center position of the light spot by calculating according to the echo amplitude values of the four quadrants includes:
center position O (x, y) of the spot:
wherein k denotes a scaling factor, U1、U2、U3And U4Respectively representing the echo peaks of the four quadrants.
Still further, the specific method for obtaining the deflection angle of the semi-active laser seeker 5 relative to the target 9 through calculation according to the central position of the light spot includes:
declination angle θ of semi-active laser guidance head 5 with respect to target 9:
in the invention, the continuous laser 3 is used as a light source, although the average power of the continuous laser is high, the peak power is low, and if the continuous laser 3 is directly applied to a traditional laser seeker system, a power signal with a low peak value is submerged in noise of a detector and cannot be detected. The continuous wave semi-active laser seeker system provided by the invention can detect a low peak power signal submerged in noise by detecting the amplitude of each quadrant echo of the four-quadrant detector to further determine the center of a light spot converged on the four-quadrant detector.
In the invention, the low peak power signal submerged in noise is detected, and the angle of the deviation of the optical axis of the seeker and the target is detected. The detection range of the system is therefore no longer dependent on the peak power of the echo, but on the average energy per detection. Therefore, the average energy can be ensured by reducing the peak power and increasing the detection time, so that the target detection of the semi-active laser seeker system can be realized by using a continuous laser with smaller average power.
In addition, due to the adoption of a related signal detection method, the suppression capability of various noises in the detection process is greatly enhanced, so that the system can be allowed to work under lower echo intensity.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.
Claims (7)
1. A continuous wave semi-active laser seeker system, comprising: the device comprises a radio frequency signal source (2), a continuous laser (3), an upper computer (4), a semi-active laser seeker (5) and a two-dimensional moving platform (6);
the semi-active laser seeker (5) comprises an optical system (10), a four-quadrant detector (11), a trans-impedance amplifier (12), a pre-amplification circuit (13), an AD sampling circuit (14) and a signal processing circuit (15);
the radio frequency signal source (2) circularly sends out a pseudo-random M sequence which is used as a trigger signal to trigger the continuous laser (3) to emit continuous laser with coded information, the continuous laser irradiates the target (9), and the target (9) performs diffuse reflection on the continuous laser;
an optical window of the semi-active laser seeker (5) is over against a target (9), the semi-active laser seeker (5) is installed on a two-dimensional moving platform (6), and the transverse moving direction and the longitudinal moving direction of the two-dimensional moving platform (6) are both perpendicular to the normal direction of the target (9);
the optical system (10) is arranged at the front end of the semi-active laser seeker (5) and used for receiving laser diffusely reflected by the target (9), filtering stray light, and after the stray light is filtered out, the center of a light spot of the laser converges at the center of the four-quadrant detector (11);
the four-quadrant detector (11) converts the optical signal into a current signal, and then outputs the current signal to the trans-impedance amplifier (12);
the transimpedance amplifier (12) amplifies the current signal, converts the current signal into a voltage signal, and outputs the voltage signal to the preamplifier circuit (13);
the pre-amplification circuit (13) amplifies the voltage signal and outputs the amplified voltage signal to the AD sampling circuit (14);
the AD sampling circuit (14) samples the voltage signal, converts an analog signal obtained by sampling into a digital signal, and then sends the digital signal to the signal processing circuit (15);
the signal processing circuit (15) processes the acquired digital signals to acquire echo information of each quadrant and outputs the acquired echo information of each quadrant to the upper computer (4);
and the upper computer (4) solves and obtains the deflection angle of the semi-active laser seeker (5) relative to the target (9) according to the coding information contained in the echo signal.
2. The continuous wave semi-active laser guidance head system of claim 1, further comprising a mobile station controller (7) and a mobile station control computer (8);
the mobile station control computer (8) sends a control signal to the mobile station controller (7);
the mobile station controller (7) controls the transverse moving position and the longitudinal moving position of the two-dimensional mobile station (6) according to the control signal;
the spot center of the laser received by the optical system (10) is converged at the center position of the four-quadrant detector (11) through controlling the transverse position and the longitudinal position of the two-dimensional mobile platform (6).
3. The continuous wave semi-active laser seeker system of claim 2 further comprising a test stand (1); the radio frequency signal source (2), the continuous laser (3), the upper computer (4), the semi-active laser seeker (5), the two-dimensional moving table (6), the moving table controller (7) and the moving table control computer (8) are all installed on the test bed (1).
4. The continuous wave semi-active laser seeker system according to claim 1, wherein the specific method for the upper computer (4) to solve and obtain the deflection angle of the semi-active laser seeker (5) relative to the target (9) according to the coded information contained in the echo signal comprises the following steps:
firstly, calculating to obtain echo amplitudes of four quadrants;
then, calculating according to the echo amplitude values of the four quadrants to obtain the central position of the light spot;
and finally, calculating and obtaining the deflection angle of the semi-active laser guide head (5) relative to the target (9) according to the central position of the light spot.
5. The continuous wave semi-active laser seeker system according to claim 4, wherein the specific method for obtaining echo amplitudes of four quadrants by calculation is as follows:
and (3) carrying out shift multiplication on the echo signal of each quadrant and a known coded continuous wave sequence, and then adding the echo signal and the known coded continuous wave sequence to obtain an echo curve, wherein the peak value of the echo curve is the echo amplitude.
6. The continuous wave semi-active laser seeker system according to claim 5, wherein the specific method for obtaining the central position of the light spot according to the echo amplitude value calculation of the four quadrants comprises:
center position O (x, y) of the spot:
wherein k denotes a scaling factor, U1、U2、U3And U4Respectively representing the echo peaks of the four quadrants.
7. The continuous wave semi-active laser guidance head system according to claim 6, wherein the specific method for obtaining the deflection angle of the semi-active laser guidance head (5) relative to the target (9) according to the central position calculation of the light spot comprises:
deflection angle theta of the semi-active laser guiding head (5) relative to the target (9):
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| CN202210163777.4A CN114526634A (en) | 2022-02-22 | 2022-02-22 | Continuous wave semi-active laser seeker system |
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2022
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Patent Citations (8)
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| US20020080061A1 (en) * | 2000-12-11 | 2002-06-27 | Rafael - Armament Development Authority Ltd. | Method and system for active laser imagery guidance of intercepting missiles |
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