CN113219443A - Laser radar target simulator - Google Patents
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- CN113219443A CN113219443A CN202110676393.8A CN202110676393A CN113219443A CN 113219443 A CN113219443 A CN 113219443A CN 202110676393 A CN202110676393 A CN 202110676393A CN 113219443 A CN113219443 A CN 113219443A
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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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
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Abstract
The invention relates to a laser radar target simulator. The laser radar target simulator comprises a telescope receiving lens, a telescope receiving lens and a measuring lens, wherein the telescope receiving lens is used for receiving laser signals sent by a laser radar to be measured; the optical fiber delay attenuation system is used for receiving a laser signal and simulating the laser signal into a laser echo signal, and comprises a first optical fiber network, wherein the first optical fiber network comprises a first optical delay device and a first optical attenuation device which are connected in series, the first optical delay device is used for forming delay of the laser signal, and the first optical attenuation device is used for forming attenuation of the laser signal; the simulator control system is used for controlling the optical fiber delay attenuation system and comprises an optical fiber delay attenuation control unit which is electrically connected with the first optical delay device and the first optical attenuation device; and the collimation transmitting lens is used for receiving the laser echo signal output by the optical fiber delay attenuation system and transmitting the laser echo signal to the laser radar to be detected. The invention provides a laser radar target simulator which can simulate single or multiple target laser echo signals at different distances under different atmospheric attenuations, and is accurate in test result and high in repeatability.
Description
Technical Field
The invention relates to the technical field of laser radar testing, in particular to a laser radar target simulator.
Background
At present, performance test of the laser radar is mainly carried out by two modes of real target test and echo simulation test. The real target test is mainly carried out in an indoor static environment or an outdoor open place by placing a real target; the echo simulation test is mainly used for simulating a remote target to finish the test by receiving laser beams by a laser echo simulator in an indoor static field environment, delaying and then transmitting echo signals.
Both of the above two test methods have corresponding drawbacks. For a real target test, the detection performance of targets which are hundreds of meters away cannot be tested due to the limitation of the field size in an indoor static field environment; when the laser radar is used for testing in an outdoor open place, the laser beams emitted by the laser radar generate atmospheric attenuation of different degrees due to changeable atmospheric environments such as rain, fog and dust, the measuring result is inaccurate, and the testing repeatability is poor.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a laser radar target simulator which can simulate single or multiple target laser echo signals with different distances under different atmospheric attenuations, and is accurate in test result and high in repeatability.
In particular, the invention provides a laser radar target simulator, which comprises,
the telescope receiving lens is used for receiving laser signals sent by the laser radar to be detected;
the optical fiber delay attenuation system is used for receiving the laser signal and simulating a laser echo signal, and comprises a first optical fiber network, wherein the first optical fiber network comprises a first optical delay device and a first optical attenuation device which are connected in series, the first optical delay device is used for forming delay of the laser signal, and the first optical attenuation device is used for forming attenuation of the laser signal;
the simulator control system is used for controlling the optical fiber delay attenuation system and comprises an optical fiber delay attenuation control unit which is electrically connected with the first optical delay device and the first optical attenuation device;
and the collimation emission lens is used for receiving the laser echo signal output by the optical fiber delay attenuation system and transmitting the laser echo signal to the laser radar to be detected.
According to an embodiment of the invention, the optical fiber testing device further comprises a test optical fiber, the test optical fiber is adopted for connection among the telescope receiving lens, the optical fiber delay attenuation system and the collimation transmitting lens, and the test optical fiber is adopted for connection between and inside the first optical delay device and the first optical attenuation device.
According to one embodiment of the invention, the test fiber is a low dispersion multimode fiber.
According to one embodiment of the invention, the first optical delay means comprises a plurality of optical switches connected in series by the test optical fibre, and the first optical attenuation means comprises a plurality of laser attenuation devices connected in series by the test optical fibre.
According to an embodiment of the present invention, the simulator control system further includes a power supply unit that supplies power to the optical fiber delay attenuation management and control unit, the first optical delay device, and the first optical attenuation device.
According to an embodiment of the present invention, the simulator control system further includes a display processing unit connected to the optical fiber delay attenuation management and control unit, and the display processing unit is configured to display or input, by an operator, an amount of delay performed on the laser signal by the first optical delay device and an amount of attenuation performed on the laser signal by the first optical attenuation device.
According to an embodiment of the present invention, the display processing unit includes a liquid crystal touch display screen for displaying the delay amount and the attenuation amount, and a simulator panel having a key device through which an operator inputs the attenuation amount and the delay amount.
According to an embodiment of the present invention, the simulator control system further includes a communication unit, and the optical fiber delay attenuation control unit is communicated with an external upper computer through the communication unit.
According to an embodiment of the present invention, the fiber optic delay attenuation system further comprises a second optical fiber network comprising a second optical delay device and a second optical attenuation device connected in series;
the laser radar target simulator also comprises an optical fiber beam splitting and combining device, wherein the optical fiber beam splitting and combining device comprises an optical fiber beam splitting device and an optical fiber beam combining device, and the optical fiber beam splitting device receives the laser signals and distributes the laser signals to form a first laser signal and a second laser signal;
the first optical fiber network receives the first laser signal and simulates a first laser echo signal, the first optical delay device is used for forming delay of the first laser signal, and the first optical attenuation device is used for forming attenuation of the first laser signal; the second optical fiber network receives the second laser signal and simulates a second laser echo signal, the second optical delay device is used for forming delay of the second laser signal, and the second optical attenuation device is used for forming attenuation of the second laser signal;
the optical fiber beam combining device is used for coupling the first laser echo signal and the second laser echo signal and sending the signals to the collimation emission lens.
According to an embodiment of the present invention, the optical fiber splitting and combining device includes an optical fiber splitting input interface and two optical fiber splitting output interfaces, the optical fiber splitting device receives the laser signal sent by the telescope receiving lens through the optical fiber splitting input interface and distributes the laser signal to form the first laser signal and the second laser signal, and the first laser signal and the second laser signal are respectively sent to the first optical fiber network and the second optical fiber network through the two optical fiber splitting output interfaces;
the optical fiber beam splitting and combining device further comprises two optical fiber beam combining input interfaces and an optical fiber beam splitting output interface, the optical fiber beam splitting device receives the first laser echo signal and the second laser echo signal through the two optical fiber beam combining input interfaces respectively, and an output signal of the optical fiber beam splitting device is sent to the collimation emission lens through the optical fiber beam splitting output interface.
The laser radar target simulator provided by the invention simulates single or multiple target laser echo signals of different distances under different atmospheric attenuations through the optical fiber delay attenuation system, and has accurate test result and high repeatability.
It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principle of the invention. In the drawings:
fig. 1 shows a schematic structural diagram of a lidar target simulator in accordance with an embodiment of the present invention.
Fig. 2 shows a schematic structural diagram of a lidar target simulator according to another embodiment of the invention.
Wherein the figures include the following reference numerals:
optical fiber delay attenuation system 102 of telescope receiving lens 101
First optical fiber network 105 first optical delay device 106
The first optical attenuation device 107 and the optical fiber delay attenuation management and control unit 108
Testing optical fiber 109 optical switch 110
Second optical fiber network 115 second optical delay device 116
Second optical attenuator 117 fiber splitting combiner 118
Optical fiber splitting device 119 and optical fiber combining device 120
Fiber splitting input interface 121 and fiber splitting output interface 122
Fiber-combining input interface 123 and fiber-splitting output interface 124
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. 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 application.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited. Further, although the terms used in the present application are selected from publicly known and used terms, some of the terms mentioned in the specification of the present application may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein. Further, it is required that the present application is understood not only by the actual terms used but also by the meaning of each term lying within.
Fig. 1 shows a schematic structural diagram of a lidar target simulator in accordance with an embodiment of the present invention. As shown in the figure, a lidar target simulator mainly comprises a telescope receiving lens 101, a fiber delay attenuation system 102, a simulator control system 103 and a collimation transmitting lens 104.
The telescope receiving lens 101 is used for receiving laser signals sent by the laser radar to be detected. Currently, the laser radars commonly used in the market include 905nm and 1550nm bands. It is easy to understand that due to the difference of different lens materials, coating films and transmittances of the telescope receiving lens 101, the attenuation of laser signals of different wave bands is different, and different telescope receiving lenses 101 can be replaced to respectively correspond to the laser radar tests of different wave bands.
The fiber delay and attenuation system 102 is used for receiving the laser signal and simulating a laser echo signal. The fiber delay attenuation system 102 includes a first fiber optic network 105. The first optical fiber network 105 comprises a first optical delay device 106 and a first optical attenuation device 107 connected in series. The first optical delay means 106 is used to form a delay of the received laser signal, i.e. the transmission distance of the analog laser signal. The first light attenuating device 107 is used to form an attenuation of the laser signal, i.e. to simulate different atmospheric attenuations. The first optical delay device 106 may be located before or after the first optical attenuation device 107 on the transmission line of the laser signal.
The simulator control system 103 is used to control the fiber delay attenuation system 102. The simulator control system 103 includes a fiber delay and attenuation management and control unit 108. The optical fiber delay attenuation management and control unit 108 is electrically connected to the first optical delay device 106 and the first optical attenuation device 107, and is configured to control the first optical delay device 106 and the first optical attenuation device 107.
The collimating transmitting lens 104 receives the laser echo signal output by the fiber delay attenuation system 102 and transmits the laser echo signal to the laser radar to be detected.
Preferably, the lidar target simulator also includes a test fiber 109. The telescope receiving lens 101, the optical fiber delay attenuation system 102 and the collimation transmitting lens 104 are connected by the test optical fiber 109. A test fiber 109 is also connected between and within the first optical delay device 106 and the first optical attenuation device 107. More preferably, the test fiber 109 is a low dispersion multimode fiber. The low-dispersion multimode optical fiber is used for connecting various components in the laser radar target simulator to realize the transmission of laser signals. The multimode fiber has different refraction types such as step refractive index and graded refractive index, can bear the transmission of multi-path laser signals with different wavelengths, has lower cost and has good applicability to the signal transmission of most laser radars with the farthest detection distance of hundreds of meters to kilometers. Meanwhile, the propagation speeds of the laser signals with different wavelengths in the test fiber 109 are different, so that the dispersion phenomenon with different broadening occurs, and particularly, modal dispersion, intra-mode dispersion and the like in the multimode fiber become main factors influencing the bandwidth, thereby greatly influencing the fiber transmission. In order to be suitable for testing laser radars in various wavebands such as 905nm and 1550nm, the low-dispersion multimode optical fiber is a choice with both laser signal transmission efficiency and low cost.
Preferably, the first optical delay device 106 comprises a plurality of optical switches 110 connected in series by a test optical fiber 109, and the first optical attenuation device 107 comprises a plurality of laser attenuation devices connected in series by the test optical fiber 109. Referring to fig. 1, in the present embodiment, the first optical delay device 106 includes 13 mechanical 2x2 optical switches 110 of 0 th to 12 th stages, and 14 segments of different lengths of test fibers 109 connecting all the optical switches 110 and including input and output ports. Different optical switch 110 control signals are issued by the optical fiber delay attenuation management and control unit 108, so that laser signals are transmitted in the test optical fiber 109 with corresponding length, and laser echo signals at different distances are simulated.
The simulation of the optical delay system on the distance is measured and calculated based on the time-of-flight method, namely the ToF principle, and the principle of the time-of-flight method is described as the following formula:
wherein L is a target distance; n is the refractive index of air, 1.000278; c is the speed of light, and 299792458m/s is taken for ensuring the measurement accuracy; t is the delay of the echo relative to the transmit beam.
The step size of the simulated distance of the first optical delay device 106 is determined by the shortest length of the test fiber 109 between the two optical switches 110, and the delay corresponding to the 1cm transmission distance is 66ps according to the above formula. In the present embodiment, the shortest length of the test optical fiber 109 between the optical switches 110 is 5cm, so the minimum delay time corresponding to the first optical delay device 106 is 330ps, and the corresponding minimum step amount, i.e., the accuracy of the simulated distance, is 5 cm.
The maximum simulation distance of the first optical delay device 106 is determined by the total length of the optical fiber in the optical delay system, and different lengths of the test optical fiber 109 can be selected according to actual needs to realize simulation requirements of different distances. The maximum distance that can be simulated in this embodiment is (213-1) × 5cm ═ 40955 cm.
The first optical attenuation device 107 adjusts the laser power through a group of laser attenuation devices with continuously adjustable laser attenuation, so as to realize the simulation of different atmospheric attenuation under different environments. The first optical attenuation device 107 of this embodiment has the characteristics that the laser attenuation ratio is irrelevant to the state of the input laser signal, the polarization state and the spatial distribution state of the laser signal are not changed in the attenuation adjustment process, and the like, and is convenient for the laser radar to be detected to receive and identify the simulated laser echo signal.
Preferably, the simulator control system 103 further comprises a power supply unit 111. The power supply unit 111 supplies power to the optical fiber delay attenuation management and control unit 108, the first optical delay device 106, and the first optical attenuation device 107.
Preferably, the simulator control system 103 further includes a display processing unit 112 connected to the fiber delay-attenuation management and control unit 108. The display processing unit 112 is used for displaying or inputting the delay amount of the laser signal executed by the first optical delay device 106 and the attenuation amount of the laser signal executed by the first optical attenuation device 107 by an operator. More preferably, the display processing unit 112 includes a liquid crystal touch display and a simulator panel. The liquid crystal touch screen is used for status feedback and may display the amount of delay currently being performed by the first optical delay device 106 and the amount of attenuation being performed by the first optical attenuation device 107. The simulator panel is used for executing control, and has a key device through which an operator inputs an attenuation amount and a delay amount so that the first light attenuating device 107 and the first light delaying device 106 execute the attenuation amount and the delay amount, respectively. Optionally, the operator may also input the attenuation amount and the delay amount by touching the display screen with the liquid crystal.
Preferably, the simulator control system 103 further comprises a communication unit 113. The optical fiber delay attenuation control unit 108 is communicated with an external upper computer 114 through a communication unit 113, so as to realize control communication of the upper computer 114. The communication interface of the communication unit 113 is an Ethernet network interface. Specifically, the upper computer 114 is used for automatic control of the lidar target simulator, sets the delay amount and the attenuation amount of the lidar target simulator through the Ethernet communication interface, and monitors the current states of the delay amount and the attenuation amount, thereby implementing Ethernet remote control of the simulator control system 103. The upper computer 114 is a main device for remote operation of a tester during laser radar testing. Since the wavelengths and dispersion degrees of the laser signals of different bands are different, the actual transmission distances of the laser signals in the test fiber 109 are also different, and therefore calibration and correction need to be performed by simulating the distances according to the laser signals of different bands.
When the farthest detection distance is tested, the simulation distance is set through the upper computer 114 until the tested laser radar cannot detect the simulation target, and then the delay amount can be recorded as the farthest detection distance of the tested laser radar. When the distance precision is tested, a simulation distance is set through the upper computer 114, the set delay amount is compared with the target position displayed by the tested laser radar, and the distance precision can be tested.
Fig. 2 shows a schematic structural diagram of a lidar target simulator according to another embodiment of the invention. As shown, the fiber delay decay system 102 of the lidar target simulator includes a second fiber optic network 115 in addition to the first fiber optic network 105. The second optical fiber network 115 includes a second optical delay device 116 and a second optical attenuation device 117 connected in series. The second optical fiber network 115 includes a second optical delay device 116 and a second optical attenuation device 117 connected in series. The second optical delay device 116 is used to form a delay of the received laser signal, i.e. the transmission distance of the analog laser signal. The second light attenuating device 117 is used to form an attenuation of the laser signal, i.e. to simulate different atmospheric attenuations. The second optical delay device 116 may be located before or after the second optical attenuation device 117 on the transmission path of the laser signal.
Further, the second optical delay device 116 includes a plurality of optical switches 110 connected in series by the test optical fiber 109, and the second optical attenuation device 117 includes a plurality of laser attenuation devices connected in series by the test optical fiber 109. In this embodiment, the second optical fiber network 115 and the first optical fiber network 105 are identical in structure.
The lidar target simulator also includes a fiber optic beam splitting combiner 118. The optical fiber beam splitter and combiner 118 includes an optical fiber beam splitter 119 and an optical fiber beam combiner 120, where the optical fiber beam splitter 119 receives the laser signal from the telescope receiving lens 101, and distributes the laser signal power according to a certain ratio to form a first laser signal and a second laser signal.
The first fiber optic network 105 receives the first laser signal and simulates a first laser echo signal. The first optical delay device 106 is used to form a delay of the first laser signal and the first optical attenuation device 107 is used to form an attenuation of the first laser signal. Similarly, the second fiber optic network 115 receives the second laser signal and simulates a second laser echo signal. The second optical delay device 116 is used to form a delay of the second laser signal and the second optical attenuation device 117 is used to form an attenuation of the second laser signal.
The optical fiber beam combining device 120 is configured to couple the first laser echo signal and the second laser echo signal, and combine the first laser signal and the second laser signal with different delay amounts and attenuation amounts into one test optical fiber 109. And finally output to the collimating transmitting lens 104 through the test fiber 109.
The simulator control system 103 is used to control the fiber delay attenuation system 102. The simulator control system 103 includes a fiber delay and attenuation management and control unit 108. The optical fiber delay attenuation management and control unit 108 is electrically connected to the first optical delay device 106 and the first optical attenuation device 107 of the first optical fiber network 105, and is configured to control the first optical delay device 106 and the first optical attenuation device 107. The optical fiber delay attenuation management and control unit 108 is further electrically connected to a second optical delay device 116 and a second optical attenuation device 117 of the second optical fiber network 115, and is configured to control the second optical delay device 116 and the second optical attenuation device 117. Specifically, the simulator control system 103 may simulate the first laser signal and the second laser signal on the first optical fiber network 105 and the second optical fiber network 115 with different delay amounts and attenuation amounts, respectively, to form a multi-echo laser signal.
The collimating transmitting lens 104 receives the laser echo signal output by the fiber delay attenuation system 102 and transmits the laser echo signal to the laser radar to be detected.
The multi-echo target simulation test is used for simulating the multi-target resolving power of the laser radar to be tested when light spots of a certain beam of laser fall on two or more objects to form multi-echo signals with different distances.
Preferably, the fiber splitter/combiner 118 includes one fiber splitter input interface 121 and two fiber splitter output interfaces 124122. The optical fiber beam splitting device 119 receives the laser signal sent by the telescope receiving lens 101 through the optical fiber beam splitting input interface 121 and distributes the laser signal to form a first laser signal and a second laser signal, and the first laser signal and the second laser signal are respectively sent to the first optical fiber network 105 and the second optical fiber network 115 through the two optical fiber beam splitting output interfaces 124122.
The optical splitter/combiner 118 further includes two optical splitter input ports 123 and an optical splitter output port 124122. The optical fiber beam splitting device 119 receives the first laser echo signal and the second laser echo signal through two optical fiber beam combining input interfaces 123, respectively, and an output signal of the optical fiber beam splitting device 119 is sent to the collimating transmitting lens 104 through an optical fiber beam splitting output interface 124122.
Preferably, the signal transmission mode of the laser radar target simulator is an optical fiber all-optical transmission mode. Compared with other modes of completing signal transmission through optical/electrical and electrical/optical conversion, the optical fiber all-optical transmission mode has small influence on the change of characteristics such as frequency, power, phase, polarization state and the like of a space laser beam, has the advantages of small attenuation, high noise immunity and the like, and has certain advantages in long-distance laser signal transmission. Meanwhile, the optical fiber all-optical transmission mode can be compatible with laser signal transmission of various systems such as pulse and FMCW.
The laser radar target simulator provided by the invention has the following characteristics:
1. the laser target simulation in a long-distance and complex environment is realized through the optical fiber delay and optical fiber attenuation technology;
2. the simulation of the optical fiber beam splitting and combining device is used for realizing the simulation of multi-target laser echo;
3. and the laser radar test compatible with various systems and wave bands is realized.
It will be apparent to those skilled in the art that various modifications and variations can be made to the above-described exemplary embodiments of the present invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Claims (10)
1. A lidar target simulator comprising,
the telescope receiving lens is used for receiving laser signals sent by the laser radar to be detected;
the optical fiber delay attenuation system is used for receiving the laser signal and simulating a laser echo signal, and comprises a first optical fiber network, wherein the first optical fiber network comprises a first optical delay device and a first optical attenuation device which are connected in series, the first optical delay device is used for forming delay of the laser signal, and the first optical attenuation device is used for forming attenuation of the laser signal;
the simulator control system is used for controlling the optical fiber delay attenuation system and comprises an optical fiber delay attenuation control unit which is electrically connected with the first optical delay device and the first optical attenuation device;
and the collimation emission lens is used for receiving the laser echo signal output by the optical fiber delay attenuation system and transmitting the laser echo signal to the laser radar to be detected.
2. The lidar target simulator of claim 1, further comprising a test fiber, the test fiber coupling being employed between the telescope receive lens, the fiber delay attenuation system, and the collimating transmit lens, the test fiber coupling being employed between and within the first optical delay device and the first optical attenuation device.
3. The lidar target simulator of claim 2, wherein the test fiber is a low dispersion multimode fiber.
4. The lidar target simulator of claim 2, wherein the first optical delay device comprises a plurality of optical switches connected in series by the test fiber, and the first optical attenuation device comprises a plurality of laser attenuation devices connected in series by the test fiber.
5. The lidar target simulator of claim 1, wherein the simulator control system further comprises a power supply unit that supplies power to the fiber delay attenuation management and control unit, the first optical delay device, and the first optical attenuation device.
6. The lidar target simulator of claim 5, wherein the simulator control system further comprises a display processing unit connected to the fiber delay attenuation management and control unit, the display processing unit being configured to display or input by an operator an amount of delay performed on the laser signal by the first optical delay device and an amount of attenuation performed on the laser signal by the first optical attenuation device.
7. The lidar target simulator of claim 6, wherein the display processing unit comprises a liquid crystal touch display for displaying the delay amount and the attenuation amount, and a simulator panel having a key device through which an operator inputs the attenuation amount and the delay amount.
8. The lidar target simulator of claim 5, wherein the simulator control system further comprises a communication unit, and the fiber delay attenuation management and control unit is in communication with an external upper computer through the communication unit.
9. The lidar target simulator of claim 1, wherein the fiber optic delay attenuation system further comprises a second fiber optic network comprising a second optical delay device and a second optical attenuation device in series;
the laser radar target simulator also comprises an optical fiber beam splitting and combining device, wherein the optical fiber beam splitting and combining device comprises an optical fiber beam splitting device and an optical fiber beam combining device, and the optical fiber beam splitting device receives the laser signals and distributes the laser signals to form a first laser signal and a second laser signal;
the first optical fiber network receives the first laser signal and simulates a first laser echo signal, the first optical delay device is used for forming delay of the first laser signal, and the first optical attenuation device is used for forming attenuation of the first laser signal; the second optical fiber network receives the second laser signal and simulates a second laser echo signal, the second optical delay device is used for forming delay of the second laser signal, and the second optical attenuation device is used for forming attenuation of the second laser signal;
the optical fiber beam combining device is used for coupling the first laser echo signal and the second laser echo signal and sending the signals to the collimation emission lens.
10. The lidar target simulator of claim 9, wherein the fiber splitting combiner comprises a fiber splitting input interface and two fiber splitting output interfaces, the fiber splitting device receives the laser signal from the telescope receiving lens through the fiber splitting input interface and distributes the laser signal to form the first laser signal and the second laser signal, and the first laser signal and the second laser signal are respectively transmitted to the first fiber network and the second fiber network through the two fiber splitting output interfaces;
the optical fiber beam splitting and combining device further comprises two optical fiber beam combining input interfaces and an optical fiber beam splitting output interface, the optical fiber beam splitting device receives the first laser echo signal and the second laser echo signal through the two optical fiber beam combining input interfaces respectively, and an output signal of the optical fiber beam splitting device is sent to the collimation emission lens through the optical fiber beam splitting output interface.
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| CN113691317A (en) * | 2021-08-20 | 2021-11-23 | 中航光电科技股份有限公司 | Adjustable optical fiber time delay module suitable for radar target simulator |
| CN114002774A (en) * | 2021-10-22 | 2022-02-01 | 中国电子科技集团公司第十一研究所 | Optical fiber time delay device and remote optical signal transmission characteristic simulation method |
| CN114089487A (en) * | 2021-09-30 | 2022-02-25 | 哈尔滨新光光电科技股份有限公司 | Laser three-dimensional imaging simulator based on DMD |
| CN116520270A (en) * | 2023-07-04 | 2023-08-01 | 四川天中星航空科技有限公司 | Radar electronic warfare testing method based on evaluation model |
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2021
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| CN113691317A (en) * | 2021-08-20 | 2021-11-23 | 中航光电科技股份有限公司 | Adjustable optical fiber time delay module suitable for radar target simulator |
| CN114089487A (en) * | 2021-09-30 | 2022-02-25 | 哈尔滨新光光电科技股份有限公司 | Laser three-dimensional imaging simulator based on DMD |
| CN114002774A (en) * | 2021-10-22 | 2022-02-01 | 中国电子科技集团公司第十一研究所 | Optical fiber time delay device and remote optical signal transmission characteristic simulation method |
| CN114002774B (en) * | 2021-10-22 | 2023-06-23 | 中国电子科技集团公司第十一研究所 | Optical fiber delay device and long-distance optical signal transmission characteristic simulation method |
| CN116520270A (en) * | 2023-07-04 | 2023-08-01 | 四川天中星航空科技有限公司 | Radar electronic warfare testing method based on evaluation model |
| CN116520270B (en) * | 2023-07-04 | 2023-09-05 | 四川天中星航空科技有限公司 | Radar electronic warfare testing method based on evaluation model |
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