Beacon-free rapid capturing system in space laser communication system

Abstract

The utility model provides a beacon-free rapid capturing system in a space laser communication system, which comprises a system base, a system shell, a periscopic servo turntable, a tracking and communication composite detection system, a piezoelectric ceramic servo galvanometer, a communication laser, a driving plate, a driving plate shell, a controller, an optical-mechanical system and a flexible elastic support, the tracking and communication composite detection system comprises a four-quadrant detector, a detection plate and a detection plate shell; the beacon-free rapid capturing system has the advantages of being smaller in system architecture size, simpler in structure and lower in power consumption, and therefore the beacon-free rapid capturing system has wide application scenes in the fields of communication, aerospace and the like.

Description

Technical Field

[0001] The utility model relates to the fields of optical communication and electrical control, and in particular to a beacon-free rapid capture system in a space laser communication system. Background Art

[0002] So far, space laser communication has a very broad application prospect due to its wide communication frequency band, fast communication speed, high confidentiality, strong anti-interference and anti-interception capabilities. A stable communication link is the basis of space laser communication. However, space laser communication requires high precision. Any slight error may lead to the failure of establishing a communication link. Space laser communication must go through the capture, alignment, and tracking system adjustments to reduce errors before establishing a communication link and starting dynamic communication. The establishment of a communication link requires capture first. With the development of the times, space capture systems increasingly require systems with small system architecture, simple structure, and lower power consumption. Utility Model Content

[0003] In order to solve the problems existing in the existing capture system, the utility model provides a beacon-free rapid capture system in a space laser communication system, which solves the problems of large volume, complex structure and high power consumption existing in the existing space laser communication capture system.

[0004] The technical solution adopted is as follows: the system includes a system base, a system housing, a periscope servo turntable, a tracking and communication composite detection system, a piezoelectric ceramic servo galvanometer, a communication laser, a drive board, a drive board housing, a controller, an optical-mechanical system and a flexible elastic support, and the tracking and communication composite detection system includes a four-quadrant detector, a detection board and a detection board housing;

[0005] The four corners of the periscope servo turntable are fixed to the system base through threaded connections, the piezoelectric ceramic servo galvanometer is fixed to the system base and forms a 45° angle with the light emitting direction of the periscope servo turntable, the optical-mechanical system is fixed to the system base, the optical-mechanical system is provided with two light outlets, and the communication laser and the four-quadrant detector are respectively arranged in the direction of the two light outlets, the communication laser is fixed to the system base and connected to the controller through wires, and the four-quadrant detector is fixed in the detection board housing;

[0006] The detection board is etched with a mutual resistance amplifier circuit and a four-channel A / D acquisition circuit, and the detection board is mounted in the detection board housing, and the detection board housing is fixed to the system base by screws;

[0007] The driving board is etched with a galvanometer control circuit and a galvanometer compensation circuit. The driving board is mounted in a driving board housing. The driving board housing is fixed to the system base by screws. The driving board is connected to four pins of the piezoelectric ceramic servo galvanometer through wires.

[0008] The controller is placed behind the detection board and fixed on the system base, and the controller is connected with the driving board and the detection board through wires.

[0009] Furthermore, the optical system is fixed on the system base through an optical-mechanical structure to converge the target light.

[0010] Furthermore, the controller is a DSP controller.

[0011] The beacon-free rapid capture system has the advantages of smaller system architecture, simpler structure, and lower power consumption. Therefore, the utility model has broad application scenarios in the fields of communications, aerospace, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is the assembly structure diagram of the utility model;

[0013] Figure 2 This is a mutual resistance amplifier circuit diagram of the utility model;

[0014] Figure 3 It is a four-channel A / D acquisition circuit diagram of the utility model;

[0015] Figure 4 It is a D / A conversion circuit of the utility model;

[0016] Figure 5 It is the driver board amplifier circuit of the utility model;

[0017] Figure 6 It is the bridge circuit of the utility model;

[0018] Figure 7 The utility model is a servo galvanometer compensation circuit diagram.

[0019] In the figure: 1 is the system base, 2 is the system housing, 3 is the periscope servo turntable, 4 is the piezoelectric ceramic servo galvanometer, 5 is the optical-mechanical system, 6 is the communication laser, 7 is the detection board, 8 is the detection board housing, 9 is the four-quadrant detector, 10 is the drive board, 11 is the drive board housing, 12 is the controller DSP, and 13 is the flexible elastic support. DETAILED DESCRIPTION

[0020] Example 1

[0021] The utility model is further described below in conjunction with the accompanying drawings:

[0022] like Figure 1As shown, the beacon-free rapid capture system in the space laser communication system includes: a system base 1, a system housing 2, a periscope servo turntable 3, a piezoelectric ceramic servo galvanometer 4, an optical-mechanical system 5, a tracking and communication composite detection system, a communication laser 6, a drive board 10, a drive board housing 11, a controller DSP 12 and a flexible elastic support 13, wherein the tracking and communication composite detection system includes a detection board 7, a detection board housing 8 and a four-quadrant detector 9;

[0023] The four corners of the periscope servo turntable 3 are fixed to the system base 1 by threaded connections. The piezoelectric ceramic servo galvanometer 4 is fixed on the system base 1 at a 45° angle to the light emitting direction of the periscope servo turntable 3. The optical system and related fastening devices constitute an optomechanical system 5 fixed on the system base 1. The optomechanical system 5 consists of an optical system and an optomechanical structure. The optical system is fixed to the system base 1 through the optomechanical structure to converge the target light. The optical system is a light processing system composed of a shaping lens, a light attenuation plate, an aperture and a narrow-band filter. The optomechanical structure is the outer shell for fixing the lens.

[0024] The optical-mechanical system 5 is provided with two light outlets, and a communication laser 6 and a four-quadrant detector 9 are respectively arranged in the direction of the two light outlets. The communication laser 6 is fixed on the system base 1 and connected to the controller DSP12 through a wire. The four-quadrant detector 9 is fixed in the detection board housing 8. The detection board 7 is etched with a mutual resistance amplifier circuit and a four-channel A / D acquisition circuit. The detection board 7 is mounted in the detection board housing 8. The detection board housing 8 is fixed on the system base 1 by screws. The controller DSP12 is placed behind the detection board 8 and fixed on the system base 1. The controller DSP12 is connected to the detection board 8 through a wire and a driving board 10. The driving board 10 etches a galvanometer control circuit and a galvanometer compensation circuit. The driving board 10 is mounted in the driving board housing 11. The driving board housing 11 is fixed on the system base 1 by screws. The driving board 10 is connected to the four pins of the piezoelectric ceramic servo galvanometer 4 through wires.

[0025] The flexible elastic support 13 is at the bottom of the system housing 2. Since the system is relatively large, it is necessary to prevent bumps when placing it.

[0026] The tracking and communication composite detection system needs to process the received light. The light is first emitted by the periscope servo turntable 3, deflected by the piezoelectric ceramic servo galvanometer 4, processed by the optomechanical system 5, and received by the four-quadrant detector 9 in the tracking and communication composite detection system. After the electrical signal is generated, it is processed by the circuit. That is, the piezoelectric ceramic servo galvanometer 4 and the optomechanical system 5 process the light, and the tracking and communication composite detection system receives the light and converts it into an electrical signal for processing by the circuit.

[0027] Reference Figures 2 to 7The circuits involved in this article are all of known structure design, and those skilled in the art are well aware of the functions and structures of the circuits. Specifically:

[0028] The mutual resistance amplifier circuit includes a cross-group amplifier circuit and a secondary amplifier circuit: the cross-group amplifier circuit is implemented by designing the pin circuit of the chip MAX3806 of Maxim Corporation according to the instruction manual, and the secondary amplifier circuit is made on a known circuit.

[0029] The A / D acquisition circuit is mainly implemented by the high-speed conversion chip AD7671ASTZ of ADI Company, and the relevant pin circuit is designed with reference to the instruction manual.

[0030] The mutual resistance amplifier circuit and the four-channel A / D acquisition circuit are etched on the detection board 7, which is a circuit board. The two circuits are used together to detect and process the communication light into electrical signals and input them to the controller DSP12.

[0031] The galvanometer control circuit receives the controller DSP12 signal to control the piezoelectric ceramic servo galvanometer 4, including a D / A conversion circuit and a driver board amplifier circuit. The D / A conversion circuit is designed based on the DAC7741 chip of Texas Instruments and its instruction manual. The driver board amplifier circuit is designed based on the well-known amplifier circuit and combined with the PA93 chip of the American APEX company and its instruction manual.

[0032] The galvanometer compensation circuit corrects the galvanometer control circuit to improve the accuracy of the galvanometer control circuit. It includes a bridge circuit and an amplifier circuit. The bridge circuit is the well-known Wheatstone bridge. The amplifier unit is composed of the chip INA103 and the chip OP3GS. The INA103 differential amplifier circuit is designed according to the pin manual, and the OP3GS amplifier circuit is designed by adjusting the known circuit.

[0033] The galvanometer control circuit and the galvanometer compensation circuit are etched on the driving board 10, which is a circuit board. The two circuits are used together to control the rotation of the piezoelectric ceramic servo galvanometer 4. The galvanometer driving circuit receives the electrical signal sent by the controller DSP12 to control the rotation of the piezoelectric ceramic servo galvanometer 4; the galvanometer compensation circuit corrects the signal of the galvanometer control circuit to improve the accuracy.

[0034] The controller is the controller DSP12. The controller DSP12 not only processes the tracking signal, but also sends the galvanometer control signal to iterate with the master optical terminal and the slave optical terminal of the entire system, and can control the piezoelectric ceramic servo galvanometer 4 and the laser emission.

[0035] This system is actually an optical terminal, which is both a master optical terminal and a slave optical terminal.

[0036] When acting as a master optical terminal, the controller DSP12 controls the communication laser 6 to work and scan, while the tracking and communication composite detection system and the galvanometer control system (galvanometer control circuit and galvanometer compensation circuit) do not work; when acting as a slave optical terminal, the communication laser 6 does not work, while the tracking and communication composite detection system and the galvanometer control system (galvanometer control circuit and galvanometer compensation circuit) work, control the galvanometer steering, the system follows the rotation, and the optical terminal adjusts its own posture.

[0037] The system continuously switches between the working states of the master optical terminal and the slave optical terminal until the capture is completed.

[0038] Its space laser communication has no beacon scanning method, and Archimedean spiral scanning is adopted on the scanning curve, and a scanning overlap area is added to prevent missed scanning.

[0039] The space-free beacon capture strategy includes the following steps:

[0040] Step 1: The master optical terminal transmits communication light to scan in the uncertain area. In each scanning cycle, the light spot will be detected by the four-quadrant detector 9 of the slave optical terminal. Each time the light spot signal is detected, the slave optical terminal immediately adjusts its posture to point to the master optical terminal and repeats the scanning several times.

[0041] Step 2: The main optical terminal stops scanning, and the working states of both parties are exchanged. The optical terminal starts scanning the remaining uncertain area, and the main optical terminal corrects the direction and gradually narrows the capture uncertain area.

[0042] Step 3: After the rough capture process, a small uncertain area remains. The two sides scan each other iteratively. One side scans and the other side follows and points, and the scanning range is further reduced.

[0043] Step 4: After the above stages are completed, the two sides are gradually aligned. After they are fully aligned, the scan ends, the fine tracking mode is started, and the capture ends.

[0044] The capture process of the specific structure in the utility model is described as follows:

[0045] Capture is a necessary process for two systems to establish a stable communication link, that is, two sets of optical transceivers are required. After completing the initial pointing, the two optical transceivers enter the capture mode synchronously, optical transceiver 1 enters the master optical transceiver mode, and optical transceiver 2 enters the slave optical transceiver mode to start the capture process. The process is:

[0046] Rough capture process 1:

[0047] The optical terminal is controlled by the controller DSP12 and enters the main optical terminal mode: the communication laser 6 works to emit communication light, the tracking and communication composite detection system and the galvanometer control system (galvanometer control circuit and galvanometer compensation circuit) do not work, the communication laser 6 emits laser light, which is emitted by the periscope servo turntable 3 through the optical-mechanical system 5 and the piezoelectric ceramic servo galvanometer 4. The communication light emitted by the communication laser 6 in the optical terminal scans in the uncertain area, and the light spot will be detected by the four-quadrant detector 9 of the optical terminal 2 in each scanning cycle.

[0048] The optical terminal 2 is controlled by the DSP controller and enters the slave optical terminal mode: the communication laser 6 does not work, the tracking and communication composite detection system and the galvanometer control system (galvanometer control circuit and galvanometer compensation circuit) work, and the communication light passes through the periscope servo turntable 3 and is deflected by the piezoelectric ceramic servo galvanometer 4. After the optical machine system 5 converges, it is irradiated on the four-quadrant detector 9. The four-quadrant detector 9 generates a phase signal, which is processed by the mutual resistance amplifier circuit and the four-channel A / D acquisition circuit on the detection board 7, and the signal is transmitted to the controller DSP12 through the wire. The controller DSP12 calculates and outputs the deflection amount of the piezoelectric ceramic servo galvanometer 4, which is transmitted to the galvanometer control circuit on the driving board 10 through the wire. The galvanometer compensation circuit compensates and controls the deflection of the piezoelectric ceramic servo galvanometer 4, so that the optical terminal 2 points to the optical terminal 1 and adjusts its own posture. Every time the optical terminal 2 detects the light spot signal, it immediately adjusts its own posture to point to the optical terminal 1 and repeats the scanning several times.

[0049] Rough capture process 2:

[0050] After a fixed time, the two optical terminals synchronously exchange modes. Optical terminal 1 enters the slave optical terminal mode and optical terminal 2 enters the master optical terminal mode. Optical terminal 2 starts to scan the remaining uncertain area, while optical terminal 1 corrects the direction, gradually narrows the capture uncertain area, and repeats the scan several times.

[0051] Semen capture process:

[0052] After the rough capture process, a very small uncertain area remains. The two sides iteratively scan each other. One side scans and the other side follows and points. The scanning range is further reduced, and each iteration scans once.

[0053] After the above stages are completed, the two sides are gradually aligned, and the communication light shines on the center of the four-quadrant detector 9. Under the control of the controller DSP12, the system ends the capture mode and starts the fine tracking mode.

Claims

1. A beacon-free rapid acquisition system in a space laser communication system, characterized by: The system includes a system base, a system housing, a periscope servo turntable, a tracking and communication composite detection system, a piezoelectric ceramic servo galvanometer, a communication laser, a drive board, a drive board housing, a controller, an optical-mechanical system and a flexible elastic support. The tracking and communication composite detection system includes a four-quadrant detector, a detection board and a detection board housing; The four corners of the periscope servo turntable are fixed to the system base through threaded connections, the piezoelectric ceramic servo galvanometer is fixed to the system base and forms a 45° angle with the light emitting direction of the periscope servo turntable, the optical-mechanical system is fixed to the system base, the optical-mechanical system is provided with two light outlets, the two light outlets are respectively provided with a communication laser and a four-quadrant detector, the communication laser is fixed to the system base and connected to the controller through wires, the four-quadrant detector is fixed in the detection board housing, the detection board is clamped in the detection board housing, and the detection board housing is fixed to the system base by screws; The controller is placed behind the detection board and fixed on the system base, and the controller is connected to the driving board and the detection board through wires; The driving board is mounted in a driving board housing, the driving board housing is fixed on the system base by screws, and the driving board is connected to four pins of the piezoelectric ceramic servo galvanometer by wires.

2. The beacon-free rapid acquisition system in a space laser communication system according to claim 1, characterized in that: The optical-mechanical system is fixed on the system base via an optical-mechanical structure to converge the target light.

3. The beacon-free rapid acquisition system in a space laser communication system according to claim 1, characterized in that: The controller is a DSP controller.

4. The beacon-free rapid acquisition system in a space laser communication system according to claim 1, characterized in that: The flexible elastic support is at the bottom of the system housing to prevent bumping during placement.

5. The beacon-free rapid acquisition system in a space laser communication system according to claim 1, characterized in that: The detection plate is etched with a mutual resistance amplifier circuit and a four-channel A / D acquisition circuit.

6. The beacon-free rapid acquisition system in a space laser communication system according to claim 1, characterized in that: The driving plate etches a galvanometer control circuit and a galvanometer compensation circuit.

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