CN112649795A - Distance simulation method and system for evaluating performance of laser range finder - Google Patents
Distance simulation method and system for evaluating performance of laser range finder Download PDFInfo
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- 238000004088 simulation Methods 0.000 title claims abstract description 76
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- 230000003287 optical effect Effects 0.000 claims abstract description 96
- 239000013307 optical fiber Substances 0.000 claims abstract description 71
- 230000010287 polarization Effects 0.000 claims abstract description 23
- 239000005337 ground glass Substances 0.000 claims abstract description 20
- 239000000835 fiber Substances 0.000 claims description 31
- 238000001069 Raman spectroscopy Methods 0.000 claims description 8
- 238000005286 illumination Methods 0.000 claims description 5
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- 238000012360 testing method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 239000005338 frosted glass Substances 0.000 description 4
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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 discloses a distance simulation method and a system for evaluating the performance of a laser range finder, wherein the distance simulation method comprises the steps of receiving laser emitted by the laser range finder, carrying out attenuation simulation on the received laser, introducing the laser into a delay optical fiber access unit to carry out delay switching of different distances, carrying out atmospheric polarization state change simulation on the laser, simulating the irradiation characteristics of different targets through ground glass, and finally irradiating the irradiation characteristics to a receiving lens of the laser range finder; the distance simulation system comprises an incident lens, a variable optical attenuator, a delay optical fiber access unit, a polarization controller, an emergent lens, ground glass and other components which are sequentially arranged. The invention overcomes the defect that the performance evaluation of the traditional laser range finder needs to be carried out outdoors, can simulate the signal echo characteristics of the laser radar transmitting signals passing through targets with different distances in a limited space of a laboratory, and further effectively improves the performance evaluation efficiency of the laser range finder.
Description
Technical Field
The invention relates to the technical field of laser ranging, in particular to a distance simulation method and a distance simulation system for evaluating the performance of a laser ranging machine indoors.
Background
In current lidar research, the laser echo characteristics of near and far targets are different, and therefore the system scheme and the signal processing scheme are different. When the echo characteristics of different parameter laser light sources, modulation and demodulation devices and radar signal algorithms acting on targets with different distances are verified, no particularly effective scheme is provided, and the method is particularly suitable for long-distance targets.
In practice, the verification is usually performed by using an actual measurement method, and the related equipment needs to be transported to areas such as plateau or desert. The verification method has the defects of low efficiency, limited target distance, incapability of testing a moving target, easiness in weather influence, incapability of verifying various new detection schemes and the like, so that the development cost and the development period are greatly increased.
Disclosure of Invention
The embodiment of the invention provides a distance simulation method and a distance simulation system for evaluating the performance of a laser range finder, which are used for overcoming the defect that the performance evaluation of the traditional laser range finder needs to be carried out outdoors, can simulate the signal echo characteristics of a laser radar transmitting signal passing through targets with different distances in a limited space of a laboratory, and further effectively improve the performance evaluation efficiency of the laser range finder.
In a first aspect, an embodiment of the present invention provides a distance simulation method for evaluating performance of a laser distance measuring machine, including the following steps:
s1: receiving laser emitted by a laser range finder;
s2: carrying out attenuation simulation on the received laser;
s3: introducing the laser subjected to attenuation simulation into a delay optical fiber access unit, and adjusting an optical switch in the delay optical fiber access unit through a control circuit to realize delay switching of different distances;
s4: carrying out atmospheric polarization state change simulation on the laser output from the delay optical fiber access unit;
s5: the laser simulated by the change of the atmospheric polarization state is emitted to ground glass through an emergent lens to simulate the irradiation characteristics of different targets;
s6: the laser penetrates through the ground glass and then is emitted to a receiving lens of the laser range finder.
In the above step S1, the laser light emitted from the laser range finder is received through the incident lens. Considering that the divergence angle of the laser beam emitted by the laser range finder is very small and the magnitude of the divergence angle is below milliradian, the laser emitted by the laser range finder is difficult to receive by manual alignment, and the incident lens can be arranged on a six-dimensional precision adjusting frame so as to facilitate incident alignment when the laser is received. In the same consideration, in step S5, the exit lens may be mounted on a six-dimensional fine adjustment frame, so that the laser light can be transmitted through the ground glass and then accurately enter the receiving lens of the laser range finder.
The delay fiber path unit in step S3 includes more than two delay fibers with different lengths or the same length, the delay fibers are connected step by using an optical switch, and the delay fibers are switched by the optical switch to switch and transmit laser signals in different fiber branches, thereby completing delay simulation of different distances. The optical switch is controlled by a control circuit. The delay optical fiber is a single mode optical fiber.
Optionally, the optical amplifier may be connected after the long-distance delay fiber to realize controllable output intensity of the laser signal. The optical amplifier may be a raman amplifier or an erbium-doped fiber amplifier (EDFA), or the like. The optical amplifier can be selectively turned off or on according to the requirement during the test, and the gain change of the optical amplifier is controlled by the control circuit.
Optionally, an acousto-optic frequency shifter capable of modulating laser frequency may be adopted in the delay optical fiber path unit, and is used to implement doppler frequency shift when the analog laser range finder detects a moving target. The acousto-optic frequency shifter is controlled by the control circuit.
Alternatively, the frosted glass may be mounted on a vibration stage to simulate the vibration of the carrier as it is being detected while simulating the illumination characteristics of different targets.
In a second aspect, an embodiment of the present invention provides a distance simulation system for evaluating performance of a laser distance measuring machine, including:
the incident lens is used for receiving laser emitted by the laser range finder;
the variable optical attenuator is used for carrying out attenuation simulation on the laser transmitted by the incident lens;
the delay optical fiber access unit is used for performing delay simulation of different distance lengths on the laser subjected to attenuation simulation;
the polarization controller is used for carrying out atmospheric polarization state change simulation on the laser output from the delay optical fiber access unit;
the emergent lens is used for emitting the laser simulated by the atmospheric polarization state change to the ground glass;
ground glass is used for diffusing laser spots and simulating the irradiation characteristics of different targets.
The delay optical fiber access unit comprises more than two delay optical fibers with different or same lengths, and is connected step by step through an optical switch, and the optical switch switches the delay optical fibers under the control of a control circuit to enable laser signals to be switched and transmitted in different optical fiber branches, so that delay simulation of different distances is completed. The delay optical fiber is a single mode optical fiber.
Optionally, the distance simulation system of the embodiment of the present invention further includes an optical amplifier. The optical amplifier is connected behind the long-distance delay optical fiber so as to realize controllable output intensity of the laser signal. The optical amplifier may be a raman amplifier or an erbium-doped fiber amplifier (EDFA), or the like. The optical amplifier can be selectively turned off or on according to the requirement during the test, and the gain change of the optical amplifier is controlled by the control circuit.
Optionally, the distance simulation system of the embodiment of the present invention further includes an acousto-optic frequency shifter. The acousto-optic frequency shifter is used as the final-stage output of the delay optical fiber access unit, and simulates the Doppler frequency shift when the laser range finder detects a moving target under the control of the control circuit.
Considering that the divergence angle of a laser beam emitted by the laser range finder is very small, the magnitude of the divergence angle is below milliradian, the laser emitted by the laser range finder is difficult to receive by the manual alignment of an incident lens, and the laser emitted by the laser range finder is difficult to accurately enter a receiving lens of the laser range finder by the manual alignment of an emergent lens, the distance simulation system of the embodiment of the invention further comprises two six-dimensional precision adjusting frames which are respectively used for installing the incident lens and the emergent lens, so that the alignment of the laser incidence and the laser emission is convenient.
Optionally, the distance simulation system of the embodiment of the present invention further includes a vibration platform. The frosted glass is arranged on the vibration platform, so that the vibration condition of the carrier when the target is detected can be simulated when the irradiation characteristics of different targets are simulated.
The embodiment of the invention can simulate the target characteristics of variable distances of dozens to hundreds of kilometers by innovative designs of a delay optical fiber access unit and the like, realizes the simulation of the signal echo characteristics of laser radar transmitting signals passing through different long-distance targets in a limited space of a laboratory, is convenient for developers to carry out corresponding system upgrade and signal processing algorithm research aiming at the echo characteristics at different distances, overcomes the defect that the performance evaluation of the traditional laser range finder needs to be carried out outdoors, and creates conditions for efficiently researching and developing the laser range finder and testing the laser range finding performance.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Like reference characters designate like parts throughout the several views, wherein:
FIG. 1 is a flow chart of a distance simulation method according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a delay fiber path unit used in the distance simulation method and system according to the embodiment of the present invention;
FIG. 3 is a schematic diagram of a distance simulation system according to a second embodiment of the present invention;
FIG. 4 is a schematic diagram of a distance simulation system according to a third embodiment of the present invention;
FIG. 5 is a schematic diagram of a distance simulation system according to a fourth embodiment of the present invention;
fig. 6 is a schematic diagram of a distance simulation system according to a fifth embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
As shown in fig. 1, a first embodiment of the present invention provides a distance simulation method for evaluating performance of a laser distance measuring machine, comprising the steps of:
s1: and receiving laser emitted by the laser range finder. Considering that the divergence angle of a laser beam emitted by a laser range finder is very small, the magnitude of the divergence angle is below milliradian, and the laser emitted by the laser range finder is difficult to receive by manual alignment, in the embodiment, an incident lens is arranged on a six-dimensional precision adjusting frame, and the incident angle is adjusted by the six-dimensional precision adjusting frame to ensure the incident alignment when the laser is received;
s2: attenuation simulation was performed on the received laser light. In the step, attenuation simulation of incident laser is realized by manually adjusting a variable optical attenuator;
s3: and introducing the laser subjected to attenuation simulation into a delay optical fiber access unit to realize delay switching of different distance lengths. As shown in fig. 2, the delay fiber path unit in this embodiment includes first to nth delay fibers, N optical amplifiers, 2 1 × 2 optical switches, N-2 × 2 optical switches, and a control circuit, where N is an integer greater than or equal to 2, and is taken according to the detection distance length requirement and the length of the delay fiber used. The delay optical fiber is connected with an optical amplifier to realize controllable output intensity of the laser signal. The first optical amplifier is connected with the first 1 x 2 optical switch, one path of the 1 x 2 optical switch is connected with the second delay optical fiber, the other path of the 1 x 2 optical switch is connected with the optical fiber jumper, the length of the optical fiber jumper is very short, the delay can be ignored, the rear stage is respectively connected with the third to the N-1 delay optical fibers and the 2 x 2 optical switch, the N delay optical fiber is connected with the N delay optical fiber, the N optical amplifier is connected with the second 1 x 2 optical switch, the other path of the 1 x 2 optical switch is connected with the optical fiber jumper, and the delay optical fiber access unit is recovered into one path of output after passing through the 1 x 2 optical switch. In this embodiment, the delay fiber is a single-mode fiber, and if the test laser coherent range finder has a strict requirement on the polarization state of light, a single-mode polarization maintaining fiber needs to be selected; the length of the delay optical fiber can be as long as or short as several hundred meters and dozens of kilometers, and the lengths of the delay optical fibers can be the same or different. The optical amplifier adopts a Raman amplifier with the advantages of high gain bandwidth, low noise coefficient and the like, such as Wuhan Rui Jie-RPM-1455-500 and the like, can be selectively closed or opened according to actual requirements during testing, and uses a control circuit to adjust the output power of a pumping of the Raman amplifier so as to realize the compensation of signal attenuation. The optical switch is controlled by the control circuit according to preset logic regulation, so that laser signals are switched and transmitted in different optical fiber branches, and delay switching of different distance lengths is completed. The control circuit can be realized by matching a single chip microcomputer or a Field Programmable Gate Array (FPGA) with different circuits;
s4: and carrying out atmospheric polarization state change simulation on the laser output from the delay optical fiber passage unit. In the step, the change of the atmospheric polarization state is simulated by manually adjusting the polarization controller;
s5: the laser simulated by the atmospheric polarization state change is emitted to the ground glass through the emergent lens, so that the irradiation characteristics of different targets are simulated. Considering that the magnitude of the divergence angle of the laser beam is below milliradian, in order to facilitate the laser to accurately enter a receiving lens of a laser range finder after penetrating through ground glass, the emergent lens is arranged on a six-dimensional precision adjusting frame in the embodiment;
s6: the laser penetrates through the ground glass and then is emitted to a receiving lens of the laser range finder. The emergent angle is adjusted through the six-dimensional precision adjusting frame to ensure that the laser is accurately incident to a receiving lens of the laser range finder, and the whole process is completed.
In other embodiments, an acousto-optic frequency shifter capable of modulating the laser frequency is adopted in the time-delay fiber channel unit so as to realize the Doppler frequency shift when the analog laser range finder detects a moving target. The acousto-optic frequency shifter is connected to the tail end of the optical switch branch of the delay optical fiber access unit and is controlled by the control circuit.
In other embodiments, the frosted glass is mounted on a vibration stage to simulate the vibration of the carrier as it is being detected while simulating the illumination characteristics of different targets.
As shown in fig. 3, a second embodiment of the present invention provides a distance simulation system for evaluating performance of a laser distance measuring machine, comprising:
and the incidence lens 1 is used for receiving laser emitted by the laser range finder. In order to access the optical fiber transmission system of the latter stage. In the embodiment, a lens of a tail fiber output structure is selected, such as THORLABS-F810 FC;
a first six-dimensional fine adjustment frame 31 on which the incident lens 1 is mounted, and the incident angle is adjusted by the first six-dimensional fine adjustment frame 31 to realize incident alignment when receiving laser light;
the variable optical attenuator 2 is used for performing attenuation simulation on the laser light transmitted through the incident lens 1, and is specifically realized by manually adjusting the variable optical attenuator 2. The variable optical attenuator selected by the embodiment is in a fiber port form, and the dynamic attenuation range of the variable optical attenuator is 0 to 60dB, such as THORLABS-VOA 50-APC;
and the delay optical fiber path unit is used for performing delay simulation of different distance lengths on the laser passing through the variable optical attenuator 2. The delay fiber path unit used in this embodiment is shown in fig. 2, and the structure thereof is described in the first embodiment, which will not be described herein. The delay fiber of the present embodiment is a single mode fiber, such as corning G652; the optical switch selects an electro-optical switch which has short switching time and small volume and is convenient for photoelectric integration, such as 1 x 2 and 2 x 2 optical switches of COFIBER and Agiltron company, the maximum corresponding frequency is 100kHz, and the insertion loss is less than 2 dB;
the polarization controller 9 is used for carrying out atmospheric polarization state change simulation on the laser output from the delay optical fiber access unit, and is specifically realized by manually adjusting the polarization controller 9;
an exit lens 12 for emitting the laser light passing through the polarization controller 9 to the ground glass 10;
the second six-dimensional precision adjusting frame 32 is provided with the emergent lens 12, and the emergent angle is adjusted through the second six-dimensional precision adjusting frame 32 so as to realize that the emergent laser can be accurately incident to the receiving lens of the laser range finder;
the ground glass 10 is used for diffusing laser spots, can be made of various different materials, and realizes simulation of different target irradiation and reflection characteristics. In this example, a series of ground glasses such as SIGMA-KOKI-DFB1-30C02 was selected.
As shown in FIG. 4, a third embodiment of the present invention provides a distance simulation system for evaluating the performance of a laser rangefinder. The distance simulation system of this embodiment includes all the components of the distance simulation system according to the second embodiment of the present invention, and further includes an acousto-optic frequency shifter 8, which may be selected from Gooch & Housego-3165-1, and the like. The acousto-optic frequency shifter 8 is used as the final output of the delay optical fiber access unit, is connected between the last 2 × 2 optical switch and the second 1 × 2 optical switch of the optical switch branch, and is controlled by the control circuit, so that the Doppler frequency shift when the analog laser range finder detects a moving target is realized.
As shown in FIG. 5, a fourth embodiment of the present invention provides a distance simulation system for evaluating the performance of a laser rangefinder. The distance simulation system of this embodiment includes all the components of the distance simulation system according to the second embodiment of the present invention, and further includes a vibration platform 11, which may be an isopotential displacement vibration platform such as epsek-G0110. The frosted glass 10 is arranged on the vibration platform 11, so that the vibration condition of a carrier when the target is detected can be simulated when the irradiation characteristics of different targets are simulated, such as the vibration characteristics of different application places of a chariot, an airplane and the like.
As shown in fig. 6, a fifth embodiment of the present invention provides a distance simulation system for evaluating the performance of a laser rangefinder. The distance simulation system of this embodiment includes all the components of the distance simulation system according to the fourth embodiment of the present invention, and further includes an acousto-optic frequency shifter 8. In the figure, a laser path from the rear of the variable optical attenuator 2 to the front of the polarization controller 9 forms a delay optical fiber path unit, which specifically includes N delay optical fibers 4, N optical amplifiers 5, a first 1 × 2 optical switch 6, a second 1 × 2 optical switch 14, N-2 × 2 optical switches 7, and a control circuit 13, where N is an integer greater than or equal to 2, and is selected according to the detection distance length requirement and the length of the delay optical fiber used. Each delay fiber 4 is followed by an optical amplifier 5 to achieve controllable output intensity of the laser signal. The first optical amplifier 5 is connected with the first 1 x 2 optical switch 6, one path behind the first 1 x 2 optical switch 6 is connected with the second delay optical fiber, the other path is connected with an optical fiber jumper wire, the length of the optical fiber jumper wire is very short, the delay can be ignored, the rear stage is respectively connected with the third to the N-1 delay optical fibers and the 2 x 2 optical switch, the rear stage is connected with the Nth delay optical fiber, the Nth optical amplifier is connected with the second 1 x 2 optical switch 14, the other path of input of the second 1 x 2 optical switch 14 is connected with the optical fiber jumper wire, and the delay optical fiber access unit is recovered into one path of output after passing through the second 1 x 2 optical switch 14. In this embodiment, the optical amplifier 5 adopts a raman amplifier having advantages of high gain bandwidth, low noise coefficient, and the like, and can be selectively turned off or on according to actual needs during testing, and the control circuit 13 is used to adjust the output power of the raman amplifier pump, thereby realizing compensation for signal attenuation. The optical switch is controlled by the control circuit 13 according to predetermined logic adjustment, so that laser signals are switched and transmitted in different optical fiber branches, and delay switching of different distance lengths is completed. The control circuit 13 can be realized by matching a single chip microcomputer or a Field Programmable Gate Array (FPGA) with different circuits. The acousto-optic frequency shifter 8 is used as the final-stage output of the delay optical fiber access unit, is connected between the last 2 × 2 optical switch and the second 1 × 2 optical switch 14 of the optical switch branch, and is controlled by the control circuit 13, so as to realize the Doppler frequency shift when the analog laser range finder detects a moving target.
The distance simulation method and the distance simulation system for evaluating the performance of the laser range finder provided by the embodiment of the invention can simulate the target characteristics of variable distances of dozens to hundreds of kilometers, realize the simulation of the signal echo characteristics of laser radar transmitting signals passing through different long-distance targets in a limited space of a laboratory, facilitate the research personnel to carry out corresponding system upgrade and signal processing algorithm research aiming at the echo characteristics at different distances, overcome the defect that the traditional performance evaluation of the laser range finder needs to be carried out outdoors, and create conditions for efficiently researching and developing the laser range finder and testing the laser range finder performance.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A distance simulation method for evaluating performance of a laser rangefinder, the distance simulation method comprising the steps of:
s1: receiving laser emitted by a laser range finder;
s2: carrying out attenuation simulation on the received laser;
s3: introducing the laser subjected to attenuation simulation into a delay optical fiber access unit, and adjusting an optical switch in the delay optical fiber access unit through a control circuit to realize delay switching of different distances;
s4: carrying out atmospheric polarization state change simulation on the laser output from the delay optical fiber access unit;
s5: the laser simulated by the change of the atmospheric polarization state is emitted to ground glass through an emergent lens to simulate the irradiation characteristics of different targets;
s6: the laser penetrates through the ground glass and then is emitted to a receiving lens of the laser range finder.
2. The distance simulation method of claim 1, wherein in step S1, the laser emitted from the laser rangefinder is received by the incident lens, and the incident lens is mounted on the six-dimensional fine adjustment frame;
in step S3, the delay fiber path unit includes more than two delay fibers with different lengths or the same length, the delay fibers are connected step by using an optical switch, the delay fibers are switched by the optical switch to switch and transmit laser signals in different fiber branches, and the optical switch is controlled by a control circuit; the long-distance delay optical fiber in the delay optical fiber access unit is connected with an optical amplifier, so that the output intensity of the laser signal can be controlled; the optical amplifier is selectively switched off or on according to requirements, and the gain change of the optical amplifier is controlled by a control circuit.
In the step S5, the exit lens is mounted on a six-dimensional precision adjusting frame so that the laser light can accurately enter the receiving lens of the laser range finder after penetrating through the ground glass.
3. A distance simulation method according to claim 2, wherein the ground glass is mounted on a vibration stage so as to simulate vibration of the carrier when detecting the object while simulating illumination characteristics of different objects.
4. The distance simulation method according to any one of claims 1 to 3, wherein an acousto-optic frequency shifter capable of modulating laser frequency is used in the delay optical fiber path unit for realizing Doppler frequency shift when an analog laser rangefinder detects a moving target; the acousto-optic frequency shifter is controlled by the control circuit.
5. A distance simulation system for evaluating performance of a laser rangefinder, the distance simulation system comprising:
the incident lens (1) is used for receiving laser emitted by the laser range finder;
a variable optical attenuator (2) for performing attenuation simulation on the laser light transmitted through the incident lens (1);
the delay optical fiber access unit is used for carrying out delay simulation of different distance lengths on the laser passing through the variable optical attenuator (2);
a polarization controller (9) for performing atmospheric polarization state change simulation on the laser light output from the delay fiber path unit;
an exit lens (12) for emitting the laser light passing through the polarization controller (9) to the ground glass (10);
ground glass (10) for diffusing laser spots to simulate the illumination and reflection characteristics of different targets.
6. The distance simulation system according to claim 5, further comprising a first six-dimensional fine adjustment frame (31) and a second six-dimensional fine adjustment frame (32), the first six-dimensional fine adjustment frame (31) having the incident lens (1) mounted thereon, the second six-dimensional fine adjustment frame (32) having the exit lens (12) mounted thereon;
the delay optical fiber access unit comprises more than two delay optical fibers with different or same lengths, and is connected step by step through an optical switch, and the optical switch switches the delay optical fibers under the control of a control circuit to enable laser signals to be switched and transmitted in different optical fiber branches, so that delay simulation of different distances is completed.
7. The distance simulation system of claim 6, wherein the delay fiber path unit comprises N delay fibers (4), N optical amplifiers (5), a first 1 x 2 optical switch (6), a second 1 x 2 optical switch (14), N-2 x 2 optical switches (7), and a control circuit (13), wherein N is an integer greater than or equal to 2, and is selected according to the detection distance length requirement and the length of the delay fiber used; each delay optical fiber (4) is connected with an optical amplifier (5) in back, the first optical amplifier (5) is connected with a first 1 x 2 optical switch (6) in back, one path of the first 1 x 2 optical switch (6) is connected with a second delay optical fiber, the other path of the first 1 x 2 optical switch is connected with an optical fiber jumper, the back stage is respectively connected with third to N-1 delay optical fibers and a 2 x 2 optical switch, the back stage is connected with an Nth delay optical fiber, the Nth optical amplifier is connected with a second 1 x 2 optical switch (14) in back, the other path of the second 1 x 2 optical switch (14) is connected with an optical fiber jumper, and the delay optical fiber access unit is recovered into one path of output after passing through the second 1 x 2 optical switch (14);
the delay optical fiber (4) adopts a single mode optical fiber; the optical switch is controlled by a control circuit (13) according to preset logic regulation, so that laser signals are switched and transmitted in different optical fiber branches; the optical amplifier (5) adopts a Raman amplifier, and the output power of the pump of the Raman amplifier is regulated by a control circuit (13).
8. Distance simulation system according to any of the claims 5-7, characterized in that the distance simulation system further comprises a vibration platform (11), on which vibration platform (11) the ground glass (10) is mounted to enable simulation of the vibration of the carrier when probing objects as well as the illumination characteristics of different objects.
9. The range simulation system according to any of claims 5 to 7, further comprising an acousto-optic frequency shifter (8), the acousto-optic frequency shifter (8) being connected between the last 2 x 2 optical switch of the optical switch branch and the second 1 x 2 optical switch (14) and being controlled by the control circuit (13) to achieve the Doppler shift when the analog laser rangefinder detects a moving target.
10. The range simulation system according to claim 8, further comprising an acousto-optic frequency shifter (8), wherein the acousto-optic frequency shifter (8) is connected between the last 2 x 2 optical switch of the optical switch branch and the second 1 x 2 optical switch (14) and is controlled by the control circuit (13) to achieve the doppler shift when the analog laser rangefinder detects a moving target.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| WO2022240972A1 (en) * | 2021-05-11 | 2022-11-17 | Luminar, Llc | Range calibration and geometric calibration for lidar systems |
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