CN115097463A - Receiving device, transmitting/receiving device, and laser radar - Google Patents
Receiving device, transmitting/receiving device, and laser radar Download PDFInfo
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- CN115097463A CN115097463A CN202210630572.2A CN202210630572A CN115097463A CN 115097463 A CN115097463 A CN 115097463A CN 202210630572 A CN202210630572 A CN 202210630572A CN 115097463 A CN115097463 A CN 115097463A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
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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
- G01S7/483—Details of pulse systems
- G01S7/486—Receivers
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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
- G01S7/491—Details of non-pulse systems
- G01S7/4912—Receivers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Abstract
The invention relates to a receiving device, a transmitting/receiving device and a laser radar, wherein the receiving device comprises: the light beam separation module is used for receiving the echo signals and dividing the echo signals into first echo signals and second echo signals, wherein the echo energy of the first echo signals is greater than that of the second echo signals; the detection module at least comprises two receiving units, wherein the first receiving unit is used for receiving a first echo signal, and the second receiving unit is used for receiving a second echo signal; the processing module is used for obtaining distance information according to the first echo signal and the second echo signal received by the detection module. The receiving device provided by the application utilizes the beam splitting module to divide the echo signal into a first echo signal and a second echo signal, and utilizes the first receiving unit and the second receiving unit to receive the first echo signal and the second echo signal corresponding to different echo energies respectively. The method and the device guarantee the detection of the long-distance position and the short-distance position, reduce the short-distance detection blind area and increase the range finding dynamic range.
Description
Technical Field
The invention relates to the field of laser radar detection, in particular to a receiving device, a transmitting and receiving device and a laser radar.
Background
The laser radar is a radar system which emits laser beams to detect characteristic quantities of a target, such as position, speed and the like, and the working principle of the radar system is that the detection laser beams are emitted to the target, then received signals reflected from the target are compared with the emitted signals, and after appropriate processing is carried out, relevant information of the target, such as parameters of target distance, direction, height, speed, attitude, even shape and the like, can be obtained.
The existing radar optical system can generate reflected or scattered stray light in a structural part or an optical device, the stray light emitted to a receiving device causes the receiving device to be saturated, echo signals in a range from several meters to tens of meters nearby cannot be responded, a blind area is generated at a position close to a short distance, effective ranging cannot be achieved, and the dynamic range of ranging is small.
Disclosure of Invention
In view of this, it is necessary to provide a receiving apparatus, a transmitting/receiving apparatus, and a laser radar, in order to solve the problem that the dynamic range of ranging is small.
A receiving apparatus, said receiving apparatus comprising:
the optical beam separation module is used for receiving echo signals and dividing the echo signals into first echo signals and second echo signals, wherein the echo energy of the first echo signals is greater than the echo energy of the second echo signals;
the detection module comprises at least two receiving units, wherein the first receiving unit is used for receiving the first echo signal, and the second receiving unit is used for receiving the second echo signal;
and the processing module is used for obtaining distance information according to the first echo signal and the second echo signal received by the detection module.
In one embodiment, the beam splitting module comprises:
the first receiving lens group is used for receiving the echo signal and focusing the echo signal;
and the beam splitter is used for splitting the echo signal focused by the first receiving lens group into the first echo signal and the second echo signal.
In one embodiment, the beam splitting module comprises: the second receiving lens group is used for focusing the first echo signal, the third receiving lens group is used for focusing the second echo signal, and the effective receiving area of the second receiving lens group is larger than that of the third receiving lens group.
In one embodiment, the second receiving lens set defines a through hole matching with the third receiving lens set in size, and the third receiving lens set is embedded in the through hole.
In one embodiment, the second receiving lens group and the third receiving lens group are disposed side by side.
In one embodiment, a focal length of the second receiving lens group and a focal length of the third receiving lens group are equal.
In one embodiment, the optical axes of the second and third receiving lens groups are parallel to each other.
In one embodiment, the optical system further includes a light beam adjusting module, the light beam adjusting module includes at least two optical modulators, a first optical modulator is used for aligning the first echo signal to the first receiving unit after being adjusted, and a second optical modulator is used for aligning the second echo signal to the second receiving unit after being adjusted.
In one embodiment, the transceiver module comprises the receiving device as described above; further comprising:
the emitting device is used for emitting emergent laser;
and the light splitting device is used for enabling the emergent laser to penetrate and then to be emergent outwards, and is also used for receiving an echo signal and enabling the echo signal to be emitted to the receiving device after deflecting.
A laser radar comprises at least one transceiver module; further comprising:
and the scanning device is used for receiving the emergent laser emitted by the transceiving module, deflecting the emergent laser to emit and scan outwards, and also used for receiving an echo signal, deflecting the echo signal and emitting the deflected echo signal to the transceiving module.
Above-mentioned receiving arrangement, transceiver and lidar, receiving arrangement includes: the device comprises a beam separation module, a beam separation module and a beam separation module, wherein the beam separation module is used for receiving echo signals and dividing the echo signals into a first echo signal and a second echo signal, and the echo energy of the first echo signal is greater than that of the second echo signal; the detection module comprises at least two receiving units, wherein the first receiving unit is used for receiving the first echo signal, and the second receiving unit is used for receiving the second echo signal; and the processing module is used for obtaining distance information according to the first echo signal and the second echo signal received by the detection module. The receiving device provided by the application utilizes the beam splitting module to divide the echo signal into a first echo signal and a second echo signal with different energies, and utilizes the first receiving unit and the second receiving unit to receive the first echo signal and the second echo signal respectively. Because the energy of the second echo signal is less, stray light and interference light contained in the second echo signal are less, the second receiving unit has better response to the echo signal at the near place; meanwhile, the first echo signal has more energy, and can detect objects at long distances. This application has realized the detection of closely locating when guaranteeing the detection of long-range department, reduces closely the detection blind area, has increased receiving arrangement's range finding dynamic range.
Drawings
Fig. 1 is a schematic structural diagram of a receiving apparatus according to an embodiment of the present application;
FIG. 2 is a schematic structural diagram of a beam splitting module according to an embodiment of the present application;
FIG. 3 is a side view of a beam splitting module according to yet another embodiment of the present application;
FIG. 4 is a front view of the beam splitting module shown in FIG. 3;
FIG. 5 is a schematic structural diagram of a beam splitting module according to yet another embodiment of the present application;
fig. 6 is a schematic structural diagram of a transceiver module according to an embodiment of the present application.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, and in the drawings, preferred embodiments of the present invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. The present invention can be embodied in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the invention and therefore the invention is not limited to the specific embodiments disclosed below.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Fig. 1 is a schematic structural diagram of a receiving apparatus according to an embodiment of the present application, and as shown in fig. 1, the receiving apparatus 10 includes: the system comprises a beam separation module 110, a detection module 120 and a processing module 130, wherein the beam separation module 110 is configured to receive an echo signal and divide the echo signal into a first echo signal and a second echo signal, and echo energy of the first echo signal is greater than echo energy of the second echo signal; the detection module 120 comprises at least two receiving units: a first receiving unit 121 and a second receiving unit 122, where the first receiving unit 121 is configured to receive a first echo signal, and the second receiving unit 122 is configured to receive a second echo signal; the processing module 130 is configured to obtain distance information according to the first echo signal and the second echo signal received by the detecting module 120.
Specifically, the receiving apparatus 10 includes a beam splitting module 110, a detecting module 120 and a processing apparatus 130, where the beam splitting module 110 receives an echo signal, and splits the echo signal into a first echo signal and a second echo signal, where echo energy of the first echo signal is greater than echo energy of the second echo signal; the echo signal is a laser signal returned after the emergent signal is reflected by a detection object in the target field of view. The detection module 120 includes at least two receiving units, namely a first receiving unit 121 and a second receiving unit 122, where the first receiving unit 121 is configured to receive a first echo signal, and the second receiving unit 122 is configured to receive a second echo signal. The echo energy of the first echo signal is large, and the detection distance of the first receiving unit 121 receiving the first echo signal is long; the echo energy of the second echo signal is small, and the detection distance at which the second receiving unit 122 receives the second echo signal is short. The detection distances of the first receiving unit 121 and the second receiving unit 122 are related to the echo energy of the first echo signal and the echo energy of the second echo signal, i.e. related to the splitting ratio of the beam splitting module 110. For example, the beam splitting module 110 may split the echo signals in a ratio of 95:5, that is, the echo energy of the first echo signal is 95% of the total energy of the echo signals, and the echo energy of the second echo signal is 5% of the total energy of the echo signals; the first receiving unit 121 receives the first echo signal at a ranging distance of 5-100 m, and the second receiving unit 122 receives the second echo signal at a ranging distance of 0.5-5 m. The beam splitting module 110 may split the echo signals according to a plurality of ratios such as 90:10, 80:20, etc. according to the requirement of distance measurement. The processing module 130 acquires information of the object by detecting the first echo signal and the second echo signal.
It should be noted that the beam splitting module may also split the echo signal into at least two beams, for example, the beam splitting module may split the echo signal into a first echo signal, a second echo signal, and a third echo signal; the echo energy of the first echo signal is greater than the echo energy of the second echo signal, and the echo energy of the first echo signal is greater than the echo energy of the third echo signal. As described in the foregoing embodiment, the first echo signal has the largest energy, and the first receiving unit receives the first echo signal to obtain the object information at a long distance; the second echo signal and the third echo signal have smaller echo energy and are used for obtaining object information at a short distance. Further, the echo energy of the second echo signal is greater than the echo energy of the third echo signal, and the ranging distance of the third echo signal is smaller than the detection distance of the second echo signal. For example, the beam splitting module 110 splits the echo signals into a first echo signal, a second echo signal and a third echo signal according to a ratio of 90:8:2, a distance measurement range for the first receiving unit to receive the first echo signal is 5-100 meters, a distance measurement range for the second receiving unit to receive the second echo signal is 0.5-5 meters, and a distance measurement range for the third receiving unit to receive the third echo signal is 0.2-0.5 meters.
The receiving apparatus 10 includes: the system comprises a light beam separation module 110, a detection module 120 and a processing device 130, wherein the light beam separation module 110 is configured to receive an echo signal and divide the echo signal into a first echo signal and a second echo signal, and echo energy of the first echo signal is greater than echo energy of the second echo signal; a detection module 120, including at least two receiving units, a first receiving unit 121 configured to receive a first echo signal, and a second receiving unit 122 configured to receive a second echo signal; the processing module 130 is configured to obtain distance information according to the first echo signal and the second echo signal received by the detection module. The receiving apparatus 10 provided in the present application utilizes the beam splitting module 110 to split the echo signal into a first echo signal and a second echo signal with different energies, where the echo energy of the first echo signal is greater than the echo energy of the second echo signal, and utilizes the first receiving unit 121 and the second receiving unit 122 to receive the first echo signal and the second echo signal, respectively. Since the second echo signal has less energy and contains less stray light and interference light, the second receiving unit 122 responds better to the echo signal at near; meanwhile, the energy of the first echo signal is more, and an object at a long distance can be detected. The application ensures that the detection at a long distance is realized, the detection at a short distance is realized, the detection blind area at a short distance is reduced, and the ranging dynamic range of the receiving device 10 is increased.
There are various methods for the beam splitting module 110 to split the received echo signals into the first echo signal and the second echo signal. Fig. 2 is a schematic structural diagram of a beam splitting module 110 according to an embodiment of the present disclosure, in which the beam splitting module 110 includes: a first receiving lens group 111 for receiving and focusing the echo signal; and a beam splitter 112, configured to split the echo signal focused by the first receiving lens group 111 into a first echo signal and a second echo signal.
Specifically, the first receiving lens group 111 may be disposed on an optical path of an echo signal reflected by an object within the field of view, and the first receiving lens group 111 receives the echo signal and focuses the echo signal; the echo signals are returned after the emergent signals are reflected by objects in the field of view, the emergent signals are generally subjected to diffuse reflection by the objects, and the diameters of light spots of the echo signals are large; after the echo signals are focused by the first receiving lens group 111, as many echo signals as possible can be incident into the beam splitter 112, and the receiving device receives many echo signals, which is beneficial to improving the farthest detection distance. The beam splitter 112 splits the echo signal focused by the first receiving lens group 111 into a first echo signal and a second echo signal. As shown in fig. 2, the echo signal enters from the first optical port of the beam splitter 112, the first echo signal exits from the second optical port of the beam splitter 112, and the second echo signal exits from the third optical port of the beam splitter 112. Illustratively, the beam splitter 112 may be a non-polarizing beam splitter prism. As described in the foregoing embodiment, the splitting ratio of the beam splitter 112 can be arbitrarily customized, and can be 95: 5. 90: 10. 80:20, etc., the division ratio of the beam splitter 112 may be selected according to actual circumstances, and the echo energy of the first echo signal after being split may be ensured to be larger than the echo energy of the second echo signal. In the embodiment, the beam splitter 112 is utilized to split the focused echo signal into a first echo signal and a second echo signal; the first receiving lens group 111 is arranged in front of the beam splitter 112 to focus the echo signals, the receiving aperture of the first receiving lens group 111 is large, the echo signals can be received as many as possible, the echo signals received by the first receiving lens group 111 can be incident into the beam splitter 112 after being focused, and the receiving efficiency of the echo signals is improved; the echo signal is split into a first echo signal and a second echo signal in a preset proportion by the aid of the beam splitter 112, the beam splitting proportion can be adjusted by changing different beam splitters 112, a beam splitting optical system is simple, light modulation alignment between the first receiving lens group 111 and the beam splitter 112 is facilitated, and light modulation alignment of the first echo laser and the second echo laser with respective corresponding receiving units is also simplified.
As shown in fig. 3, fig. 4 or fig. 5, which is a schematic structural diagram of a beam splitting module 110 according to an embodiment of the present application, in this embodiment, the beam splitting module 110 includes: the second receiving lens group 113 is used for focusing the first echo signal, the third receiving lens group 114 is used for focusing the second echo signal, and the effective receiving area of the second receiving lens group 113 is larger than that of the third receiving lens group 114.
Specifically, the beam splitting module includes: a second receiving lens group 113 and a third receiving lens group 114. The second receiving lens group 113 and the third receiving lens group 114 are used for focusing, the second receiving lens group 113 and the third receiving lens group 114 are arranged on an optical path of the echo signal, the second receiving lens group 113 is used for focusing the first echo signal, and the third receiving lens group 114 is used for focusing the second echo signal; the effective receiving area of the second receiving lens group 113 is larger than that of the third receiving lens group 114. In this embodiment, a part of the echo signals received by the second receiving lens assembly 113 is first echo signals, a part of the echo signals received by the third receiving lens assembly 114 is second echo signals, and an effective receiving area of the second receiving lens assembly 113 is larger than an effective receiving area of the third receiving lens assembly 114, so that a part of the echo signals received by the second receiving lens assembly 113 is more, and echo energy of the first echo signals is larger than echo energy of the second echo signals. Echo signals are directly received through at least two receiving lens groups with different effective receiving areas, the echo signal emitted to the second receiving lens group is a first echo signal, the echo signal emitted to the third receiving lens group is a second echo signal, and the first echo signal and the second echo signal are focused respectively and then emitted to respective receiving units; the second receiving lens group 113 and the third receiving lens group 114 are adopted to simultaneously realize beam splitting and focusing, so that the loss of light beam energy is reduced, the optical system is simple, and light modulation alignment is facilitated.
Fig. 3 is a schematic structural diagram of the light beam splitting module 110 according to an embodiment of the present application, in which in one embodiment, the second receiving lens assembly 113 is provided with a through hole with a size matched with that of the third receiving lens assembly 114, and the third receiving lens assembly 114 is embedded in the through hole; the optical axes of the second receiving lens group 113 and the third receiving lens group 114 are parallel to each other.
Specifically, the second receiving lens group 113 is provided with a through hole with a size matched with that of the third receiving lens group 114, the third receiving lens group 114 is embedded and fixed in the through hole, and the through hole can be arranged at any position on the second receiving lens group 113; as shown in fig. 3, the third receiving lens group 114 is disposed at the edge of the second receiving lens group 113. In this embodiment, the optical axes of the second receiving lens group 113 and the third receiving lens group 114 are parallel to each other, which facilitates the processing and fixing of the second receiving lens group 113 and the third receiving lens group 114, and also ensures that the first echo signal and the second echo signal are both focused on one side of the second receiving lens group 113. In this embodiment, the third receiving lens group 114 is embedded and fixed on the second receiving lens group 113, and the gap between the second receiving lens group 113 and the third receiving lens group 114 is small, so as to ensure light beam separation, reduce a part of echo signals leaked from the gap between the second receiving lens group 113 and the third receiving lens group 114, improve the receiving efficiency of the echo signals, and improve the overall distance measurement distance of the receiving apparatus. In addition, the second receiving lens group 113 and the third receiving lens group 114 are fixed into a whole, so that the second receiving lens group 113 is only required to be positioned on the optical path of the echo laser, and the second receiving lens group 114 is also required to be positioned on the optical path of the echo laser, thereby facilitating assembly and light modulation; the focused first echo signal and the focused second echo signal converge on the same side of the second receiving lens group 113, and the receiving device is provided with a first receiving unit 121 and a second receiving unit 122 on the focusing side for respectively receiving the first echo signal and the second echo signal, so that the system and the structural design of the receiving device are simplified, and the structure is compact.
Fig. 5 is a schematic structural diagram of a beam splitting module 110 according to an embodiment of the present application, in which a second receiving lens group 113 and a third receiving lens group 114 are arranged side by side; the optical axes of the second receiving lens group 113 and the third receiving lens group 114 are parallel to each other.
Specifically, the second receiving lens group 113 and the third receiving lens group 114 are arranged side by side; preferably, as shown in fig. 5, edges of the second receiving lens group 113 and the third receiving lens group 114 may abut. In this embodiment, the optical axes of the second receiving lens group 113 and the third receiving lens group 114 are parallel to each other, which facilitates the processing and fixing of the second receiving lens group 113 and the third receiving lens group 114, and also ensures that the first echo signal and the second echo signal are both focused on one side of the second receiving lens group 113. In this embodiment, the second receiving lens group 113 and the third receiving lens group 114 are close to each other, so that the second receiving lens group 113 and the third receiving lens group 114 can be ensured to fall on the optical path of the echo signal as much as possible, the echo signals received by the second receiving lens group 113 and the third receiving lens group 114 are improved, and the receiving efficiency of the echo signals can be improved. The second receiving lens group 113 and the third receiving lens group 114 are arranged side by side, so that the structure is simple and the installation is convenient; the adjustment and the replacement of a single receiving lens group are convenient. The focused first echo signal and the focused second echo signal are converged at the same side of the second receiving lens group 113 and the third receiving lens group 114, and the receiving device is provided with a first receiving unit 121 and a second receiving unit 122 on the focusing side for respectively receiving the first echo signal and the second echo signal, so that the system and the structural design of the receiving device are simplified, and the structure is compact.
In one embodiment, the focal length of the second receiving lens group and the focal length of the third receiving lens group are equal.
Specifically, since the receiving unit is disposed on the focal plane of the receiving lens group, and the focal length of the second receiving lens group is equal to the focal length of the third receiving lens group, as described in the foregoing embodiment, the second receiving lens group and the third receiving lens group are both disposed on the same plane, so that the focal plane of the second receiving lens group and the focal plane of the third receiving lens group are also on the same plane, and the first receiving unit and the second receiving unit can be disposed on the same plane, thereby simplifying the system and structural design of the receiving device.
In one embodiment, the receiving apparatus further includes a light beam adjusting module, the light beam adjusting module includes at least two optical modulating sets, a first optical modulating set is used for aligning the first echo signal to the first receiving unit after being adjusted, and a second optical modulating set is used for aligning the second echo signal to the second receiving unit after being adjusted. For example, the first optical modulator set may further focus the first echo signal, so that the spot diameter of the received first echo signal is reduced, and the first echo signal can be received by the first receiving unit. For example, the first optical modulator set may adjust a spot shape of the first echo signal, so that the spot shape of the first echo signal matches a receiving surface shape of the first receiving unit, thereby improving receiving efficiency of the first echo signal. For example, the first optical modulator group may change a direction of the first echo signal, so that the first echo signal is incident in a direction almost perpendicular to the receiving surface of the first receiving unit, thereby improving the receiving efficiency. The second light modulation set has a similar function to the first light modulation set, and is not described herein again. In this embodiment, the first optical adjusting unit and the second optical adjusting unit are added to adjust the directions and the light spot shapes of the first echo signal and the second echo signal, so that the first receiving unit and the second receiving unit can receive more echo signals, and the receiving efficiency of the first echo signal and the second echo signal is increased.
An embodiment of the present application provides a transceiver module, as shown in fig. 6, the transceiver module 1 includes the receiving apparatus 10, and further includes: an emitting device 20 for emitting the outgoing laser light; and the light splitting device 30 is used for enabling the emitted laser to pass through and emit outwards, and is also used for receiving the echo signal, deflecting the echo signal and emitting the deflected echo signal to the receiving device 10.
Specifically, the transceiver module 1 includes: a transmitting device 20, a light splitting device 30 and a receiving device 10. The emitting device 20 emits outgoing laser, the light splitting device 30 enables the outgoing laser to pass through and then to be emitted to a target view field, an echo signal reflected by an object in the target view field is received by the light splitting device 30, the light splitting device 30 receives the echo signal and deflects the echo signal and then emits the deflected echo signal to the receiving device 10, so that the receiving device 10 receives the echo signal by using the light beam separation module 110 and divides the echo signal into a first echo signal and a second echo signal, wherein the echo energy of the first echo signal is greater than the echo energy of the second echo signal; a first receiving unit included by the detection module is used for receiving a first echo signal, and a second receiving unit is used for receiving a second echo signal; the processing module 130 obtains distance information according to the first echo signal and the second echo signal received by the detection module. The transceiver module 1 disclosed in this embodiment includes a receiving device 10, wherein the receiving device 10 uses a beam splitting module to split an echo signal into a first echo signal and a second echo signal, and uses a first receiving unit and a second receiving unit to receive the first echo signal and the second echo signal, respectively. Because the energy of the second echo signal is less, stray light and interference light contained in the second echo signal are less, the second receiving unit has better response to the echo signal at the near place; meanwhile, the energy of the first echo signal is more, and an object at a long distance can be detected. This application has realized the detection of closely locating when guaranteeing the detection of long-range department, reduces closely the detection blind area, has increased receiving arrangement's range finding dynamic range.
The embodiment of the application provides a laser radar, and laser radar includes: at least one transceiver module; further comprising: and the scanning device is used for receiving the emergent laser emitted by the transceiving module, deflecting the emergent laser to emit and scan outwards, and also used for receiving the echo signal, deflecting the echo signal and emitting the deflected echo signal to the transceiving module.
The laser radar disclosed in this embodiment includes at least one transceiver module, and a receiving apparatus in the transceiver module uses a beam splitting module to split an echo signal into a first echo signal and a second echo signal, and uses a first receiving unit and a second receiving unit to receive different echo energies, i.e., a first echo signal and a second echo signal corresponding to different detection distances, respectively. The laser radar that this application provided includes at least one transceiver module, and the beam separation module that includes in every transceiver module divides the echo signal into the unequal first echo signal of energy and second echo signal to utilize first receiving element and second receiving element to receive first echo signal and second echo signal respectively. Because the energy of the second echo signal is less, stray light and interference light contained in the second echo signal are less, the second receiving unit has better response to the echo signal at the near place; meanwhile, the energy of the first echo signal is more, and an object at a long distance can be detected. This application has realized the detection of closely locating when guaranteeing the detection of long-range department, reduces closely the detection blind area, has increased receiving arrangement's range finding dynamic range.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, many variations and modifications can be made without departing from the spirit of the invention, which falls within the scope of the invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (5)
1. A receiving apparatus, characterized in that said receiving apparatus comprises:
the device comprises a beam separation module, a beam separation module and a beam separation module, wherein the beam separation module is used for receiving echo signals and dividing the echo signals into a first echo signal and a second echo signal, and the echo energy of the first echo signal is greater than that of the second echo signal;
the detection module comprises at least two receiving units, wherein the first receiving unit is used for receiving the first echo signal, and the second receiving unit is used for receiving the second echo signal;
the processing module is used for obtaining distance information according to the first echo signal and the second echo signal received by the detection module;
wherein the beam splitting module comprises: the echo signal enters from a first light port of the beam splitter, the first echo signal exits from a second light port of the beam splitter, and the second echo signal exits from a third light port of the beam splitter; the beam splitting ratio of the light emitted from the second light port is larger than that of the light emitted from the third light port.
2. The receiver apparatus according to claim 1, wherein the splitting ratio is adjustable by replacing a different one of the beam splitters.
3. The receiving device of claim 1, wherein the beam splitter is a non-polarizing beam splitter prism.
4. A transceiver module, characterized in that it comprises a receiving device according to claims 1-3; further comprising:
the emitting device is used for emitting emergent laser;
and the light splitting device is used for enabling the emergent laser to penetrate and then to be emergent outwards, and is also used for receiving an echo signal and enabling the echo signal to be emitted to the receiving device after deflecting.
5. Lidar characterized in that it comprises at least one transceiver module according to claim 4; further comprising:
and the scanning device is used for receiving the emergent laser emitted by the transceiving module, deflecting the emergent laser to emit and scan outwards, and also used for receiving an echo signal, deflecting the echo signal and emitting the deflected echo signal to the transceiving module.
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| CN111929691A (en) * | 2020-09-27 | 2020-11-13 | 锐驰智光(北京)科技有限公司 | Laser radar and control method thereof |
| CN115128572A (en) * | 2021-03-24 | 2022-09-30 | 华为技术有限公司 | Signal receiving device, detecting device, signal processing method and device |
| CN114325738B (en) * | 2021-12-23 | 2023-01-10 | 探维科技(北京)有限公司 | Method for measuring distance and laser radar |
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| CN1967284A (en) * | 2006-09-14 | 2007-05-23 | 中国科学院安徽光学精密机械研究所 | Lidar transmission-type double focal length optical transceiver system |
| US9992477B2 (en) * | 2015-09-24 | 2018-06-05 | Ouster, Inc. | Optical system for collecting distance information within a field |
| CN105403877B (en) * | 2015-11-12 | 2017-11-10 | 中国科学院上海光学精密机械研究所 | Larger Dynamic range of optical divides field detection laser radar |
| CN105911534B (en) * | 2016-04-12 | 2018-11-20 | 中国科学院上海光学精密机械研究所 | The optical filtering apparatus that transmitance changes with field of view of receiver angle |
| CN205809286U (en) * | 2016-05-03 | 2016-12-14 | 中国科学院上海技术物理研究所 | The Novel double-channel laser radar improving echo dynamic range receives system |
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