A test system and method for laser multi-target phased array communication terminal

Abstract

The present invention provides a testing system and method for a laser multi-target phased array communication terminal, comprising a laser communication device, a three-channel adjustable optical attenuator, a spontaneous radiation light source, a fiber combiner, a fiber collimator, a beamsplitter, a fast-reflecting mirror, a collimator, a plane reflector assembly, a surveillance camera, a fast-reflecting mirror drive controller, and laser ground inspection equipment. The system can simulate the motion characteristics, background light noise characteristics, platform vibration characteristics, and light field distribution of laser multi-target, multi-angle communication links, and conduct comprehensive testing and evaluation of the optical, communication, and tracking performance of the laser multi-target phased array communication terminal. The present invention solves the problem of multi-target performance testing and evaluation of laser phased array communication terminals, significantly improving the test efficiency and test completeness of laser multi-target phased array communication terminals. The system has the advantages of simple composition, convenient construction, and adjustable parameters, and can be widely used in performance testing and evaluation of various types of satellite-borne and airborne laser multi-target phased array communication terminals.

Description

Technical Field

[0001] The present invention relates to the field of measurement and testing technology, and in particular to a testing system and method for a laser multi-target phased array communication terminal. Background Art

[0002] Current space laser communication terminals mostly use mechanical rotation, operating on a "point-to-point" basis. This makes it difficult to effectively achieve rapid access and networking between "one-to-many" terminals, making it difficult to support the efficient networking and long-life requirements of future aerospace information networks. Laser multi-target phased array communication terminals, with their small size, light weight, and support for "one-to-many" communication, have become the primary solution for space laser communication networking. Regarding laser communication terminal testing, current laser communication terminal test systems are mostly "point-to-point" and cannot meet the testing requirements of laser multi-target phased array communication terminals.

[0003] Non-Patent Document 1 (Ground Detection and Verification Technology for Satellite Laser Communication II, Liu Liren, China Laser, February 2007, Vol. 34, No. 2, pp. 147-155) discloses a ground-based inspection system for satellite laser communication terminals using full physical simulation. It employs a laser collimator to simulate the opposing laser communication terminal, a beam scanner to deflect the beam to simulate the relative motion trajectory of the satellite in space, and a proportional, equivalent ultra-long focal length optical Fourier transform to simulate the beam's far-field propagation. This system can only test single-target, point-to-point, traditional laser communication terminals and is incapable of testing multi-target laser phased array communication terminals. Non-Patent Document 2 (A Conditional Simulation Method for Indoor Satellite Laser Communication System Testing, Wang Bo, Proceedings of the 2008 Space Electronics Academic Annual Conference, pp. 245-250) discloses a conditional simulation method for indoor satellite laser communication system testing. This document provides only a preliminary and general analysis of the spatial conditions to be simulated and does not provide details of the satellite laser communication test system. Consequently, it is incapable of testing multi-target laser phased array communication terminals. Although both of the above technologies have achieved "point-to-point" single-target laser communication terminal testing, they have not solved the problem of comprehensive testing and evaluation of the performance of laser multi-target phased array communication terminals.

[0004] In order to conduct comprehensive testing and evaluation of the performance of the laser multi-target phased array communication terminal, the test system must be able to simulate the motion characteristics, background light noise characteristics, platform vibration characteristics and light field distribution characteristics of the laser multi-target, multi-angle communication link, and conduct comprehensive testing of the optical, communication, tracking and other performance of the laser multi-target phased array communication terminal. Summary of the Invention

[0005] The present invention aims to solve the problem of comprehensive testing and evaluation of laser multi-target phased array communication terminals, and provides a test system and method for laser multi-target phased array communication terminals. The test system includes the laser communication equipment to be tested, a three-channel adjustable optical attenuator, a spontaneous radiation light source, a fiber combiner, a fiber collimator, a beam splitter, a fast-reflecting mirror, a parallel light pipe, a plane reflector group, a surveillance camera, a fast-reflecting mirror drive controller, and a laser ground inspection device, which can test and evaluate the receiving performance and the transmitting performance. The present invention has a simple composition, convenient construction, and adjustable parameters. It can simulate the motion characteristics, background light noise characteristics, platform vibration characteristics, and light field distribution characteristics of laser multi-target and multi-angle communication links, and can perform comprehensive testing and evaluation of the optical, communication, tracking, and other performance of the laser multi-target phased array communication terminal. The present invention thoroughly solves the problem of multi-target performance testing and evaluation of laser phased array communication terminals, and greatly improves the test efficiency and test completeness of laser multi-target phased array communication terminals.

[0006] The present invention provides a test system for a laser multi-target phased array communication terminal, comprising a companion laser communication device, a three-channel adjustable optical attenuator arranged on one side of the companion laser communication device, a spontaneous radiation light source arranged on the other side of the three-channel adjustable optical attenuator, a fiber combiner, a fiber collimator, and a beam splitter sequentially arranged at the input and output ends of the three-channel adjustable optical attenuator, a fast reflector arranged on the reflection channel of the beam splitter, a collimator arranged on the input and output optical paths of the fast reflector, a plane reflector group arranged on the input and output optical paths of the collimator, and a laser ground inspection device connected to the laser multi-target phased array communication terminal to be tested, wherein the plane reflector group is arranged on the input and output optical paths of the laser multi-target phased array communication terminal to be tested.

[0007] The accompanying test laser communication equipment is used to transmit accompanying test laser signals, receive laser signals and evaluate laser signals. The spontaneous radiation light source is used to simulate the background light noise power in the space environment and output the simulated background light noise signal to the three-channel adjustable optical attenuator. The laser ground detection equipment is used to perform statistical analysis and display on the performance of the received laser signal. The laser ground detection equipment is used to control the laser multi-target phased array communication terminal to be tested to transmit laser signal beams to targets at different positions in a time-sharing manner.

[0008] The test system for a laser multi-target phased array communication terminal of the present invention, as a preferred embodiment, further comprises a monitoring camera arranged on the transmission light path of the beam splitter and a fast mirror drive controller connected to the fast mirror;

[0009] The monitoring camera is used to monitor and display the movement of the received light spot after tracking, and the fast reflex mirror drive controller is used to simulate the micro-vibration of the satellite platform and drive the fast reflex mirror to move.

[0010] The test system for a laser multi-target phased array communication terminal described in the present invention is preferably configured such that the accompanying laser communication device is a bidirectional full-duplex laser communication device, which includes laser communication signal encoding, modulation, laser signal transmission, laser signal reception, demodulation, and decoding functions.

[0011] The three-channel variable optical attenuator is a three-channel variable optical attenuator with polarization state maintaining function;

[0012] The spontaneous radiation light source is a broadband spontaneous radiation light source, and the output power of the spontaneous radiation light source can be continuously set;

[0013] The fiber optic combiner is a 3×1 fiber optic combiner. The fiber optic collimator can output the signal beam in the optical fiber as a spatial beam. When the fiber optic collimator is used inverted, it can couple the spatial beam into the optical fiber for transmission. The beam splitter has a transmission and reflection splitting ratio of 1:9. The fast mirror is a piezoelectric fast mirror or a voice coil fast mirror. The collimator includes a collimator body and a collimator secondary mirror. The collimator body is a long-focus reflective collimator with an adjustable focal plane.

[0014] In a test system for a laser multi-target phased array communication terminal described in the present invention, as a preferred embodiment, the plane mirror group includes at least two plane mirrors coated with a high-reflection film system, and the number of plane mirrors is the same as the number of targets of the laser phased array communication terminal to be tested.

[0015] The present invention describes a test system for a laser multi-target phased array communication terminal. As a preferred embodiment, the laser ground inspection equipment is a bidirectional full-duplex laser communication equipment. The bidirectional full-duplex laser communication equipment includes laser communication signal encoding function, modulation function, laser signal transmission function, laser signal reception function, demodulation function, decoding function, instruction information setting function, communication frame editing function, communication bit error rate statistics function, capture time statistics function, tracking accuracy statistics function, data display function, curve drawing function and data storage function.

[0016] In the test system for a laser multi-target phased array communication terminal described in the present invention, preferably, the monitoring camera is a visible light camera or an infrared focal plane camera;

[0017] The fast mirror drive controller can generate NASDA satellite vibration spectrum simulation signals and drive and control the fast mirror movement.

[0018] The present invention provides a test method for a laser multi-target phased array communication terminal, including a receiving performance test and a transmitting performance test;

[0019] The receiving performance test includes the following steps:

[0020] S11, modulation of the accompanying test laser signal and the simulated background optical noise signal: the accompanying test laser communication device transmits the accompanying test laser signal, and the spontaneous radiation light source transmits the simulated background optical noise signal. The accompanying test laser signal and the simulated background optical noise signal respectively enter the three-channel adjustable optical attenuator and are then combined by the optical fiber combiner to obtain a receiving performance test signal;

[0021] S12. Transmission of receiving performance test signals: The receiving performance test signal enters the optical fiber collimator and is emitted to the beam splitter. The beam splitter then reflects the light beam to the quick reflector. The quick reflector reflects the light beam to the collimator for beam expansion and emission. The outgoing light beam from the collimator simultaneously enters the plane reflector group and is reflected by plane mirrors at different angles within the plane reflector group before being incident on the laser multi-target phased array communication terminal to be tested. The laser multi-target phased array communication terminal to be tested tracks and demodulates the signal before outputting it to the laser ground inspection equipment.

[0022] S13. Receiving performance evaluation: The laser ground inspection equipment performs statistical analysis on the performance of receiving laser signals and displays that the receiving performance test is completed.

[0023] In a preferred embodiment of the present invention, a method for testing a laser multi-target phased array communication terminal includes the following steps: in step S12, a fast mirror, under the action of a fast mirror drive controller, reflects the light beam to a collimator for beam expansion and emission; the collimator includes a collimator body and a collimator secondary mirror; the fast mirror reflects the light beam to the collimator secondary mirror and then the light beam is incident on the collimator body;

[0024] In step S13, the performance of the received laser signal includes modulation mode, detection sensitivity and bit error rate.

[0025] The test method for a laser multi-target phased array communication terminal described in the present invention, as a preferred embodiment, comprises the following steps of testing the emission performance:

[0026] S21, laser signal beam emission: the laser ground inspection equipment sends command information to control the laser multi-target phased array communication terminal to be tested to emit laser signal beams to targets at different positions in a time-sharing manner;

[0027] S22. Laser signal transmission: The laser signal beams are respectively reflected by the plane reflector group and then incident on the collimator. The collimator converges the laser signal beams and then reflects them to the beam splitter through the fast reflector. The beam splitter transmits part of the laser signal beam to the surveillance camera for tracking signal monitoring and reflects the other part of the laser signal beam to the fiber collimator. The fiber collimator couples and receives the spatial beam and then outputs it to the fiber combiner, three-channel variable optical attenuator and accompanying laser communication equipment in sequence.

[0028] S23. Transmission performance evaluation: The accompanying laser communication equipment performs statistical analysis on the performance of laser signals reflected by plane mirrors at different angles in the plane reflector group, and the transmission performance test is completed.

[0029] In the test method for a laser multi-target phased array communication terminal described in the present invention, as a preferred embodiment, the reflected laser signal performance includes laser wavelength, modulation mode and EVM.

[0030] In the test method for a laser multi-target phased array communication terminal described in the present invention, as an optimal manner, the receiving performance test and the transmitting performance test are performed simultaneously.

[0031] The technical solution of the present invention is: a test system for a laser multi-target phased array communication terminal, including a test laser communication device, a three-channel variable optical attenuator, a spontaneous radiation light source, a fiber combiner, a fiber collimator, a beam splitter, a fast-reflecting mirror, a collimator, a plane reflector assembly, a laser ground inspection device, a surveillance camera, and a fast-reflecting mirror drive controller. It is characterized by:

[0032] When testing the receiving performance of a multi-target laser phased array communication terminal, the laser signal emitted by the accompanying laser communication device and the simulated background light noise signal emitted by the spontaneous emission light source are each passed through a three-channel variable optical attenuator, then combined by a fiber optic combiner. The beam is then transmitted by a fiber collimator to a beam splitter, where it is reflected by the beam splitter to a fast-reflection mirror. Driven by the fast-reflection mirror drive controller, the fast-reflection mirror reflects the beam to a collimator for beam expansion. The beams emitted from the collimator are simultaneously incident on a plane mirror assembly. After being reflected by plane mirrors at different angles within the assembly, the beams are then incident on the multi-target laser phased array communication terminal, completing the laser signal reception. Statistical analysis of the received laser signal's modulation mode, detection sensitivity, bit error rate, and other performance characteristics is performed using laser ground inspection equipment, completing the test and evaluation of the receiving performance of the multi-target laser phased array communication terminal.

[0033] When testing the transmission performance of a multi-target laser phased array communication terminal, the laser ground inspection equipment sends command information, sequentially controlling the terminal to transmit laser signal beams at targets at different locations in a time-sharing manner. The laser signal beams are reflected by a plane mirror array before entering a collimator. After being converged by the collimator, they are reflected by a fast-reflection mirror to a beam splitter. A portion of the laser signal beam is transmitted through the beam splitter to a surveillance camera for tracking and monitoring, while the remaining portion is reflected by the beam splitter to a fiber collimator for spatial beam coupling and reception. The received laser signal passes through a fiber combiner and a three-channel variable optical attenuator before being transmitted to the accompanying test laser equipment. The accompanying test laser equipment then performs statistical analysis and displays the laser wavelength, modulation mode, and EVM characteristics of the laser signal, which is reflected by the plane mirrors at different angles within the plane mirror array, completing the test and evaluation of the transmission performance of the multi-target laser phased array communication terminal.

[0034] In actual operation, the above test process is carried out simultaneously in both directions. The link of the laser multi-target phased array communication terminal is monitored by a surveillance camera, which can further evaluate the tracking performance of the laser multi-target phased array communication terminal.

[0035] Furthermore, the accompanying laser communication equipment is a bidirectional full-duplex laser communication equipment with the functions of laser communication signal encoding, modulation, transmission and reception, demodulation and decoding.

[0036] Furthermore, the three-channel adjustable optical attenuator is a three-channel adjustable optical attenuator with a polarization state maintaining function.

[0037] Furthermore, the spontaneous radiation light source is a broadband spontaneous radiation light source, and its output power can be continuously set to simulate the background light noise power in the space environment;

[0038] Furthermore, the fiber combiner is a 3×1 fiber combiner;

[0039] Furthermore, the fiber collimator can output the signal beam in the optical fiber as a spatial beam, and when used inverted, it can couple the spatial beam into the optical fiber for transmission.

[0040] Furthermore, the beam splitter has a transmission-reflection beam splitting ratio of 1:9.

[0041] Furthermore, the fast-reflection mirror is a piezoelectric fast-reflection mirror or a voice coil fast-reflection mirror;

[0042] Furthermore, the collimator is a telephoto reflective collimator with an adjustable focal plane;

[0043] Furthermore, the plane reflector group is composed of M plane reflectors, and each mirror surface is coated with a high-reflection film system. The number M of the plane mirrors is determined by the number of targets of the laser phased array communication terminal.

[0044] Furthermore, the laser ground inspection equipment is a two-way full-duplex laser communication equipment with the functions of laser communication signal encoding, modulation, transmission and reception, demodulation and decoding, and has the functions of command information setting, communication frame editing, communication bit error rate statistics, capture time statistics, tracking accuracy statistics, data display, curve drawing, data storage and so on.

[0045] Furthermore, the monitoring camera is a visible light camera or an infrared focal plane camera, which is used to monitor and display the movement of the received light spot.

[0046] Furthermore, the quick-reflection mirror drive controller is used to generate a simulation signal of satellite platform vibration and drive and control the movement of the quick-reflection mirror, thereby simulating the micro-vibration characteristics of the satellite platform.

[0047] The present invention has the following advantages:

[0048] (1) The present invention uses a fast mirror loaded with a typical NASDA vibration spectrum to simulate satellite platform vibration, uses a broadband spontaneous radiation light source to simulate background light noise interference such as sunlight or moonlight, and uses multiple plane reflectors in conjunction with collimators to simulate the motion characteristics, background light noise characteristics, platform vibration characteristics, and light field distribution characteristics of laser multi-target and multi-angle communication links, thereby achieving comprehensive test and evaluation of the optical, communication, and tracking performance of the laser multi-target phased array communication terminal.

[0049] (2) The present invention uses a method of parallel light pipes and multi-angle arranged plane reflectors to simulate the inter-satellite transmission distance and angular coverage range, and realizes the performance test of the dynamic angle change of the laser multi-target phased array communication terminal. The system has a simple composition, convenient construction, and adjustable parameters, which greatly improves the test efficiency and test completeness of the laser multi-target phased array communication terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 This is a schematic diagram of a test system for a laser multi-target phased array communication terminal;

[0051] Figure 2 A receiving performance test flow chart for a test method for a laser multi-target phased array communication terminal;

[0052] Figure 3 The present invention provides a test method and emission performance test flow chart for a laser multi-target phased array communication terminal.

[0053] Reference numerals:

[0054] 1. Accompanying laser communication equipment; 2. Three-channel adjustable optical attenuator; 3. Spontaneous radiation source; 4. Fiber beam combiner; 5. Fiber collimator; 6. Beam splitter; 7. Fast reflector; 8. Collimator; 9. Plane reflector assembly; 10. Laser ground inspection equipment; 11. Surveillance camera; 12. Fast reflector drive controller. DETAILED DESCRIPTION

[0055] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0056] Example 1

[0057] like Figure 1 As shown, a test system and method for a laser multi-target phased array communication terminal includes a companion laser communication device 1, a three-channel adjustable optical attenuator 2 arranged on one side of the companion laser communication device 1, a spontaneous radiation light source 3 arranged on the other side of the three-channel adjustable optical attenuator 2, a fiber combiner 4, a fiber collimator 5, and a beam splitter 6 arranged in sequence at the input and output ends of the three-channel adjustable optical attenuator 2, a fast mirror 7 arranged on the reflection channel of the beam splitter 6, a collimator 8 arranged on the input and output optical paths of the fast mirror 7, a plane reflector group 9 arranged on the input and output optical paths of the collimator 8, a laser ground inspection device 10 connected to the laser multi-target phased array communication terminal to be tested, a surveillance camera 11 arranged on the transmission optical path of the beam splitter 6, and a fast mirror drive controller 12 connected to the fast mirror 7, and the plane reflector group 9 is arranged on the input and output optical paths of the laser multi-target phased array communication terminal to be tested;

[0058] The accompanying test laser communication equipment 1 is used to transmit and receive accompanying test laser signals and evaluate the laser signals. The spontaneous radiation light source 3 is used to simulate the background light noise power in the space environment and output the simulated background light noise signal to the three-channel adjustable optical attenuator 2. The laser ground inspection equipment 10 is used to perform statistical analysis and display on the performance of the received laser signal. The laser ground inspection equipment 10 is used to control the laser multi-target phased array communication terminal to be tested to transmit laser signal beams to targets at different positions in a time-sharing manner. The monitoring camera 11 is used to monitor and display the movement of the received light spot after tracking. The fast-reflection mirror drive controller 12 is used to simulate the micro-vibration of the satellite platform and drive the fast-reflection mirror 7 to move.

[0059] The accompanying laser communication device 1 is a bidirectional full-duplex laser communication device, which includes laser communication signal encoding function, modulation function, laser signal transmission function, laser signal reception function, demodulation function and decoding function;

[0060] The three-channel adjustable optical attenuator 2 is a three-channel adjustable optical attenuator with a polarization state maintaining function;

[0061] The spontaneous radiation light source 3 is a broadband spontaneous radiation light source, and the output power of the spontaneous radiation light source 3 can be continuously set;

[0062] The fiber combiner 4 is a 3×1 fiber combiner. The fiber collimator 5 can output the signal beam in the optical fiber as a spatial beam. When the fiber collimator 5 is used inverted, the spatial beam can be coupled into the optical fiber for transmission. The beam splitter 6 is a beam splitter with a transmission and reflection splitting ratio of 1:9. The fast mirror 7 is a piezoelectric fast mirror or a voice coil fast mirror. The collimator 8 includes a collimator body and a collimator secondary mirror. The collimator body is a long-focus reflective collimator with an adjustable focal plane.

[0063] The plane reflector group 9 includes at least two plane reflectors coated with a high-reflection film system, and the number of the plane mirrors is the same as the number of targets of the laser phased array communication terminal to be tested;

[0064] The laser ground inspection device 10 is a bidirectional full-duplex laser communication device, which includes laser communication signal encoding function, modulation function, laser signal transmission function, laser signal reception function, demodulation function, decoding function, instruction information setting function, communication frame editing function, communication error rate statistics function, capture time statistics function, tracking accuracy statistics function, data display function, curve drawing function and data storage function;

[0065] The surveillance camera 11 is a visible light camera or an infrared focal plane camera;

[0066] The fast mirror driving controller 12 can generate a NASDA satellite vibration spectrum simulation signal and drive and control the fast mirror 7 to move.

[0067] Example 2

[0068] like Figure 2 As shown, a test method for a laser multi-target phased array communication terminal includes a receiving performance test and a transmitting performance test;

[0069] The receiving performance test includes the following steps:

[0070] S11, modulation of the accompanying test laser signal and the simulated background light noise signal: the accompanying test laser communication device 1 transmits the accompanying test laser signal, and the spontaneous radiation light source 3 transmits the simulated background light noise signal. The accompanying test laser signal and the simulated background light noise signal respectively enter the three-channel adjustable optical attenuator 2 and are then combined by the optical fiber combiner 4 to obtain a receiving performance test signal;

[0071] S12, receiving performance test signal transmission: the receiving performance test signal enters the optical fiber collimator 5 and is emitted to the beam splitter 6, which is then reflected by the beam splitter 6 to the quick mirror 7. Under the action of the quick mirror drive controller 12, the quick mirror 7 reflects the light beam to the collimator secondary mirror of the collimator 8 and then enters the collimator body for beam expansion and emission. The outgoing light beam of the collimator 8 is simultaneously incident on the plane reflector group 9 and is reflected by the plane mirrors at different angles in the plane reflector group 9 and respectively enters the laser multi-target phased array communication terminal to be tested. The laser multi-target phased array communication terminal to be tested performs tracking and demodulation and then outputs it to the laser ground inspection equipment 10;

[0072] S13, receiving performance evaluation: The laser ground inspection device 10 performs statistical analysis on the performance of the received laser signal, including the modulation mode, detection sensitivity and bit error rate, and the receiving performance test is completed;

[0073] like Figure 3 As shown, the launch performance test includes the following steps:

[0074] S21, laser signal beam emission: the laser ground inspection device 10 sends instruction information to control the laser multi-target phased array communication terminal to be tested to emit laser signal beams to targets at different positions in a time-sharing manner;

[0075] S22. Laser signal transmission: The laser signal beams are respectively reflected by the plane reflector group 9 and then incident on the collimator 8. The collimator 8 converges the laser signal beams and then reflects them to the beam splitter 6 through the fast reflector 7. The beam splitter 6 transmits part of the laser signal beam to the monitoring camera 11 for tracking signal monitoring and reflects the other part of the laser signal beam to the fiber collimator 5. The fiber collimator 5 couples and receives the spatial beams and outputs them in sequence to the fiber combiner 4, the three-channel variable optical attenuator 2, and the accompanying laser communication device 1.

[0076] S23. Transmission performance evaluation: The accompanying laser communication equipment 1 performs statistical analysis on the performance of laser signals reflected by plane mirrors at different angles in the plane reflector group 9. The performance of the reflected laser signals includes the laser wavelength, modulation mode and EVM. The transmission performance test is completed. The receiving performance test and the transmitting performance test are carried out simultaneously.

[0077] Example 3

[0078] like Figure 1 As shown, the present invention includes a companion laser communication device 1, a three-channel adjustable optical attenuator 2, a spontaneous radiation light source 3, a fiber combiner 4, a fiber collimator 5, a beam splitter 6, a fast reflector 7, a parallel light tube 8, a plane reflector group 9, a laser ground inspection device 10, a monitoring camera 11 and a fast reflector drive controller 12.

[0079] like Figure 2As shown, when testing the receiving performance of a laser multi-target phased array communication terminal, the laser signal emitted by the accompanying laser communication device 1 and the simulated background light noise signal emitted by the spontaneous emission light source 3 are respectively transmitted through a three-channel variable optical attenuator 2, then combined by a fiber combiner 4. The beam is then transmitted by a fiber collimator 5 to a beam splitter 6, which then reflects the beam to a quick-reflection mirror 7. Under the action of a quick-reflection mirror drive controller 12, the quick-reflection mirror 7 reflects the beam to a collimator 8, where it is then expanded and transmitted. The beams emitted from the collimator 8 are simultaneously incident on a plane reflector assembly 9. After being reflected by plane mirrors at different angles within the plane reflector assembly 9, the beams are respectively incident on the laser multi-target phased array communication terminal to complete the laser signal reception (tracking and demodulation). The laser ground inspection equipment 10 performs statistical analysis and displays the modulation mode, detection sensitivity, bit error rate, and other performance characteristics of the received laser signal, completing the test and evaluation of the receiving performance of the laser multi-target phased array communication terminal.

[0080] like Figure 3 As shown, when testing the transmission performance of a multi-target laser phased array communication terminal, laser ground inspection equipment 10 sends command information, sequentially controlling the terminal to transmit laser signal beams at targets at different locations in a time-sharing manner. The laser signal beams are reflected by plane mirror assembly 9 and incident on collimator 8. After convergence by collimator 8, they are reflected by fast-reflection mirror 7 to beam splitter 6. A portion of the laser signal beams is transmitted through beam splitter 6 to surveillance camera 11 for tracking and monitoring, while the remaining portion is reflected by beam splitter 6 to fiber collimator 5 for spatial beam coupling and reception. The received laser signal passes through fiber combiner 4 and three-channel variable optical attenuator 2 before being transmitted to companion test laser device 1. Companion test laser device 1 performs statistical analysis and displays the laser wavelength, modulation mode, and EVM characteristics of the laser signals, which are reflected sequentially by plane mirrors at different angles within plane mirror assembly 9, completing the test and evaluation of the transmission performance of the multi-target laser phased array communication terminal.

[0081] In actual operation, the above test process is performed bidirectionally and simultaneously. By using the monitoring camera 11 to monitor the link of the laser multi-target phased array communication terminal, the tracking performance of the laser multi-target phased array communication terminal can be further evaluated.

[0082] When testing the receiving performance of the four-target laser phased array communication terminal, the BPSK-modulated 1549.32nm laser signal emitted by the accompanying laser communication device 1 and the simulated background light noise signal emitted by the spontaneous emission light source 3 are respectively transmitted through the three-channel variable optical attenuator 2, then combined by the fiber combiner 4. The beam is then transmitted by the fiber collimator 5 to the beam splitter 6, which then reflects it to the fast mirror 7. Under the control of the fast mirror drive controller 12, the fast mirror 7 reflects the beam to the collimator 8, where it is then expanded and transmitted. The beams emitted from the collimator 8 are simultaneously incident on the plane reflector group 9. After being reflected at different angles by the four plane reflectors, the beams are respectively incident on the four-target laser phased array communication terminal to complete the laser signal reception (tracking and demodulation). The laser ground inspection equipment 10 performs statistical analysis and displays the modulation mode, detection sensitivity, bit error rate, and other performance of the received laser signal, completing the test and evaluation of the receiving performance of the four-target laser phased array communication terminal.

[0083] To test the transmission performance of the four-target laser phased array communication terminal, laser ground inspection equipment 10 sends command information, sequentially controlling the terminal to transmit BPSK-modulated 1550.12nm laser signals to four targets at different locations. The laser signal beams are reflected by plane mirror assembly 9 before entering collimator 8. After convergence by collimator 8, they are reflected by fast-reflection mirror 7 to beam splitter 6. A portion of the laser signal beams is transmitted through beam splitter 6 to surveillance camera 11 for tracking and monitoring, while the remaining portion is reflected by beam splitter 6 to fiber collimator 5 for spatial beam coupling and reception. The received laser signal passes through fiber combiner 4 and three-channel variable optical attenuator 2 before being transmitted to companion test laser device 1. Companion test laser device 1 performs statistical analysis and displays the laser wavelength, modulation mode, and EVM characteristics of the laser signals, which are reflected sequentially by the plane mirrors in plane mirror assembly 9 at four different angles, completing the test and evaluation of the transmission performance of the four-target laser phased array communication terminal.

[0084] In actual operation, the above test process is performed bidirectionally and simultaneously. The monitoring camera 11 is used to monitor the link of the laser four-target phased array communication terminal, which can further evaluate the tracking performance of the laser four-target phased array communication terminal.

[0085] In this embodiment, the accompanying laser communication device 1 adopts a customized JGZD-type accompanying test terminal, whose modulation mode is BPSK, the operating wavelengths are 1549.32nm and 1550.12nm, and the transmitting and receiving wavelengths can be set by instructions.

[0086] In this embodiment, the three-channel variable optical attenuator 2 is a FVA-3150-BM three-channel variable optical attenuator.

[0087] In this embodiment, the spontaneous radiation light source 3 is an ALS-CL-25 broadband spontaneous radiation light source, and its wavelength range is 1528nm to 1608nm.

[0088] In this embodiment, the optical fiber combiner 4 is a 3×1 single-mode polarization-maintaining combiner.

[0089] In this embodiment, the optical fiber collimator 5 is a F810APC-1550 spatial light collimator with an NA of 0.24.

[0090] In this embodiment, the beam splitter 6 is a beam splitter with a transmission-reflection splitting ratio of 1:9 and a central wavelength of 1550 nm.

[0091] In this embodiment, the quick reflection mirror 7 is an S330 piezoelectric quick reflection mirror.

[0092] In this embodiment, the collimator 8 is a collimator with a diameter of 400 mm and a focal length of 4 m.

[0093] In this embodiment, the four reflectors in the plane reflector group 9 are all aluminum-plated plane reflectors, and their reflectivities at 1550 nm are 99.5%, 99.6%, 99.5% and 99.8% respectively;

[0094] In this embodiment, the laser ground inspection equipment 11 adopts a customized laser ground inspection equipment, whose modulation mode is BPSK, the working wavelength is 1549.32nm and 1550.12nm, the transmitting and receiving wavelengths can be set by instructions, and it has a two-way full-duplex laser communication function with laser communication signal encoding, modulation, transmission and reception, demodulation, and decoding functions, and has command information setting, communication frame editing, communication bit error rate statistics, capture time statistics, tracking accuracy statistics, data display, curve drawing, data storage and other functions.

[0095] In this embodiment, the monitoring camera 11 is an InGaAs infrared camera from Xenics.

[0096] In this embodiment, the fast mirror drive controller 12 is an E536 drive controller, which is used to generate a NASDA satellite vibration spectrum simulation control signal.

[0097] In this embodiment, the laser multi-target phased array communication terminal under test is a four-target liquid crystal laser phased array communication terminal, whose modulation mode is BPSK, the operating wavelengths are 1549.32nm and 1550.12nm, and the transmitting and receiving wavelengths can be set by command.

[0098] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A test system for a laser multi-target phased array communication terminal, characterized by: The invention comprises a test companion laser communication device (1), a three-channel adjustable optical attenuator (2) whose first channel is optically connected to the test companion laser communication device (1), a spontaneous radiation light source (3) optically connected to the second channel of the three-channel adjustable optical attenuator (2), an optical fiber combiner (4), an optical fiber collimator (5), and a beam splitter (6) optically connected to the third channel of the three-channel adjustable optical attenuator (2) in sequence, a fast reflector (7) arranged on the reflection channel of the beam splitter (6), a collimator (8) arranged on the input and output optical path of the fast reflector (7), a plane reflector group (9) arranged on the input and output optical path of the collimator (8), and a laser ground inspection device (10) connected to a laser multi-target phased array communication terminal to be tested, wherein the plane reflector group (9) is arranged on the input and output optical path of the laser multi-target phased array communication terminal to be tested; The accompanying test laser communication device (1) is used to transmit an accompanying test laser signal, receive a laser signal, and evaluate the laser signal; the spontaneous radiation light source (3) is used to simulate the background light noise power in a space environment and output the simulated background light noise signal to the three-channel adjustable optical attenuator (2); the laser ground detection device (10) is used to perform statistical analysis and display on the performance of the received laser signal; and the laser ground detection device (10) is used to control the laser multi-target phased array communication terminal to be tested to transmit laser signal beams to the plane reflector group (9) at different positions in a time-sharing manner.

2. The test system for a laser multi-target phased array communication terminal according to claim 1, characterized in that: It also includes a monitoring camera (11) arranged on the transmission light path of the beam splitter (6) and a quick-reflection mirror drive controller (12) connected to the quick-reflection mirror (7); The monitoring camera (11) is used to monitor and display the movement of the received light spot after tracking, and the fast-reflection mirror drive controller (12) is used to simulate the micro-vibration of the satellite platform and drive the fast-reflection mirror (7) to move.

3. The test system for a laser multi-target phased array communication terminal according to claim 1, characterized in that: The accompanying laser communication device (1) is a bidirectional full-duplex laser communication device, which includes a laser communication signal encoding function, a modulation function, a laser signal transmitting function, a laser signal receiving function, a demodulation function, and a decoding function; The three-channel adjustable optical attenuator (2) is a three-channel adjustable optical attenuator with a polarization state maintaining function; The spontaneous radiation light source (3) is a broadband spontaneous radiation light source, and the output power of the spontaneous radiation light source (3) can be continuously set; The optical fiber combiner (4) is a 3×1 optical fiber combiner, the optical fiber collimator (5) can output the signal light beam in the optical fiber as a spatial light beam, and when the optical fiber collimator (5) is used inverted, the spatial light beam can be coupled to the optical fiber for transmission, the beam splitter (6) is a beam splitter with a transmission and reflection splitting ratio of 1:9, the fast mirror (7) is a piezoelectric fast mirror or a voice coil fast mirror, and the collimator (8) includes a collimator body and a collimator secondary mirror, and the collimator body is a long-focus reflective collimator with an adjustable focal plane.

4. The test system for a laser multi-target phased array communication terminal according to claim 1, characterized in that: The plane reflector group (9) comprises at least two plane reflectors coated with a high-reflection film system, and the number of the plane reflectors is the same as the number of targets of the laser multi-target phased array communication terminal to be tested; The laser ground inspection device (10) is a bidirectional full-duplex laser communication device, which includes a laser communication signal encoding function, a modulation function, a laser signal transmitting function, a laser signal receiving function, a demodulation function, a decoding function, a command information setting function, a communication frame editing function, a communication error rate statistics function, a capture time statistics function, a tracking accuracy statistics function, a data display function, a curve drawing function, and a data storage function.

5. The test system for a laser multi-target phased array communication terminal according to claim 2, characterized in that: The surveillance camera (11) is a visible light camera or an infrared focal plane camera; The fast reflection mirror drive controller (12) can generate a NASDA satellite vibration spectrum simulation signal and drive and control the movement of the fast reflection mirror (7).

6. A test method for a laser multi-target phased array communication terminal, characterized by: Including receiving performance test and transmitting performance test; The receiving performance test includes the following steps: S11, modulation of the accompanying test laser signal and the simulated background light noise signal: the accompanying test laser communication device (1) emits the accompanying test laser signal, the spontaneous radiation light source (3) emits the simulated background light noise signal, the accompanying test laser signal and the simulated background light noise signal respectively enter the three-channel adjustable optical attenuator (2) and then pass through the optical fiber combiner (4) for beam combining to obtain a receiving performance test signal; S12, receiving performance test signal transmission: the receiving performance test signal enters the optical fiber collimator (5) and is emitted to the beam splitter (6), and then is reflected by the beam splitter (6) to the fast mirror (7), and the fast mirror (7) reflects the light beam to the collimator (8) for beam expansion and emission, and the outgoing light beam of the collimator (8) is incident on the plane reflector group (9) at the same time and is reflected by the plane mirrors of different angles in the plane reflector group (9) and then respectively incident on the laser multi-target phased array communication terminal to be tested, and the laser multi-target phased array communication terminal to be tested performs tracking and demodulation and then outputs it to the laser ground inspection equipment (10); S13, receiving performance evaluation: the laser ground inspection device (10) performs statistical analysis on the performance of receiving laser signals and displays that the receiving performance test is completed.

7. The test method for a laser multi-target phased array communication terminal according to claim 6, characterized in that: In step S12, the quick-reflection mirror (7) reflects the light beam to the collimator (8) under the action of the quick-reflection mirror driving controller (12) for beam expansion and emission; the collimator (8) comprises a collimator body and a collimator secondary mirror, and the quick-reflection mirror (7) reflects the light beam to the collimator secondary mirror and then the light beam is incident on the collimator body; In step S13, the performance of the received laser signal includes modulation mode, detection sensitivity and bit error rate.

8. The test method for a laser multi-target phased array communication terminal according to claim 6, characterized in that: The emission performance test includes the following steps: S21, laser signal beam emission: the laser ground inspection device (10) sends instruction information to control the laser multi-target phased array communication terminal to be tested to emit laser signal beams to the plane reflector groups (9) at different positions in a time-sharing manner; S22, laser signal transmission: the laser signal beams are respectively reflected by the plane reflector group (9) and then incident on the collimator (8), the collimator (8) converges the laser signal beams and then reflects them to the beam splitter (6) by the fast reflector (7), the beam splitter (6) transmits part of the laser signal beams to the monitoring camera (11) for tracking signal monitoring, and reflects the other part of the laser signal beams to the fiber collimator (5), the fiber collimator (5) couples and receives the spatial beams and then outputs them to the fiber combiner (4), the three-channel adjustable optical attenuator (2) and the accompanying laser communication equipment (1) in sequence; S23, emission performance evaluation: the accompanying laser communication device (1) performs statistical analysis on the performance of laser signals reflected sequentially by the plane mirrors at different angles in the plane reflector group (9), and the emission performance test is completed.

9. The test method for a laser multi-target phased array communication terminal according to claim 8, characterized in that: The reflected laser signal properties include laser wavelength, modulation mode and EVM.

10. The test method for a laser multi-target phased array communication terminal according to claim 6, characterized in that: The receiving performance test and the transmitting performance test are performed simultaneously.

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