Commercial vehicle-mounted 1550nm optical fiber laser radar system

Abstract

The invention discloses a commercial vehicle-mounted 1550nm optical fiber laser radar system, which adopts a 1550nm optical fiber laser, has the advantages of narrow linewidth, high precision, miniaturization, high power, easiness in integration and easiness in control, lays a solid foundation for a high-performance laser radar system, and comprises a transmitting part, a receiving part, a scanning system and an information processing part. According to the emission part, an excitation source periodically drives a light source to emit signals, a modulator controls the direction and the line number of the emitted signals through a light beam controller, and finally laser is emitted to a target object through an emission system. The receiving part is used for receiving a signal emitted by the target object through a receiving system to generate a received signal; the scanning system rotates at a stable rotating speed, scans a plane where the scanning system is located and generates real-time plane graph information; and information processing: performing amplification processing and digital-to-analog conversion on the received signal, calculating by an information processing module to obtain the characteristics of the surface morphology and the physical attribute of the target, and finally establishing an object model.

Description

Technical Field

[0001] The present invention relates to the field of laser radar technology, and in particular to a commercial vehicle-mounted 1550nm optical fiber laser radar system. Background Art

[0002] As ADAS and driverless driving become the main downstream application scenarios of LiDAR, the market space for LiDAR is vast, and the downstream application fields of LiDAR are extensive, which can be mainly divided into driverless driving, high-level assisted driving, service robots and the Internet of Vehicles industry. With the advancement of LiDAR in the automotive field, the LiDAR market for testing and high-precision map surveying and mapping will reach its peak, and passenger car pre-installed mass production will become the main development direction in the future.

[0003] The accelerated integration of new energy vehicles with intelligent and connected technologies has led to the rapid development and application of autonomous driving technology. Most of the domestic vehicle-mounted millimeter wave and laser radars are still imported products.

[0004] LiDAR has become one of the important perception sensors in autonomous driving systems. my country's automotive LiDAR industry has great development potential, but it still faces many problems that need to be further resolved. First, the core technology of LiDAR lags behind that of advanced foreign companies; second, the high price of LiDAR has become the main obstacle to mass production and installation. Ubiquitous sensing is a key enabler of smart environment applications, and LiDAR systems have become ideal candidates due to their high availability, low cost and privacy. Tracking and recognition are two basic functions of the system. The performance of traditional 905nm LiDAR systems is often affected by detection distance, power, limited resolution and eye damage defects, which affect their long-term development. Summary of the invention

[0005] The purpose of the present invention is to provide a commercial vehicle-mounted 1550nm fiber laser radar system to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: A commercial vehicle-mounted 1550nm fiber laser radar system, which uses a 1550nm fiber laser and has the advantages of narrow line width, high precision, miniaturization, high power, easy integration and easy control, laying a solid foundation for high-performance laser radar systems, including: transmitting part, receiving part, scanning system and information processing; Transmitting part: The excitation source periodically drives the light source to transmit signals, the modulator controls the direction and number of lines of the transmitted signal through the beam controller, and finally the laser is transmitted to the target object through the transmitting system; Receiving part: The receiving system receives the signal sent back by the target object and generates a receiving signal; Scanning system: rotates at a stable speed to scan the plane and generate real-time plane map information; Information processing: The received signal is amplified and converted from digital to analog, and then calculated by the information processing module to obtain the characteristics of the target surface morphology and physical properties, and finally establish an object model.

[0007] As a further solution of the present invention: the emission part includes: a laser driver, a laser source and an emission system, the laser driver is used to drive the laser source to generate a signal pulse, and emit the laser to the target object through the emission system.

[0008] As a further solution of the present invention: the emission system is configured to include: a lens, a reflector and a filter.

[0009] As a further solution of the present invention: the receiving part includes: an analog front end, a detection receiver and a receiving system. The analog front end is used for channel selection and analog signal amplification, and performs signal detection through the detection receiver, and then the receiving system receives the signal transmitted back by the target object.

[0010] As a further solution of the present invention: the detection receiver includes: APD, SiPM and SPAD, and the receiving system includes: lens, reflector, filter, SiPM and SPAD.

[0011] As a further solution of the present invention: the scanning system includes: a scanner driver and a scanner, and the scanner driver is used to drive the scanner to achieve deflection and angle.

[0012] As a further solution of the present invention: the scanner includes: a motor, a MEMS and a microlens.

[0013] As a further solution of the present invention: the information processing includes a main control module, which is used to realize timing control, waveform algorithm processing, other function control of the laser radar and generate point cloud data.

[0014] Compared with the prior art, the present invention has the following beneficial effects: Meeting eye safety requirements: Using 1550nm wavelength laser radar, which is crucial for safe driving, can meet eye safety requirements even at relatively high power; Strong anti-interference ability: The light source has high brightness, better beam collimation, and strong resistance to sunlight interference. In a real environment, the water absorption rate of 1550nm is stronger than that of 905nm, and it has better resistance to light interference, and it also has a huge advantage in the perception of bad weather; Long detection distance: The detection distance can reach up to 500 meters, and can reach 250 meters at a reflectivity of 10%. Early detection and perception at a sufficiently long distance is the key to reserving enough time to react; High detection accuracy: Angular resolution refers to the resolving power of the imaging system, which determines whether all objects in the scene can be seen clearly and accurately. The angular resolution of the LiDAR system can reach 0.06°*0.06°, which is true image-level accuracy. Reliability: The fiber optic architecture design is stable and reliable, and can meet the performance and safety requirements of automotive regulations for sensing elements. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the working principle diagram of the commercial vehicle-mounted 1550nm fiber laser radar system. Implementation

[0016] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0017] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0018] In addition, in order to better illustrate the present application, numerous specific details are provided in the specific embodiments below. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, and elements well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application. Example

[0019] See also Figure 1 , a commercial vehicle-mounted 1550nm fiber laser radar system, uses 1550nm fiber laser, has the advantages of narrow linewidth, high precision, miniaturization, high power, easy integration and easy control, laying a solid foundation for high-performance laser radar systems, including: transmitting part, receiving part, scanning system and information processing.

[0020] Specifically, the transmitting part: the excitation source periodically drives the light source to transmit signals, the modulator controls the direction and number of lines of the transmitted signal through the beam controller, and finally the laser is transmitted to the target object through the transmitting system; the receiving part: the receiving system receives the signal sent back by the target object to generate a receiving signal; the scanning system: rotates at a stable speed to scan the plane and generate real-time plane map information; information processing: the received signal is amplified and converted from digital to analog, and is calculated by the information processing module to obtain the characteristics of the target surface morphology and physical properties, and finally establish an object model.

[0021] Preferably, in this embodiment, the transmitting part includes: a laser driver, a laser source and a transmitting system, and the laser driver is used to drive the laser source to generate a signal pulse, and transmit the laser to the target object through the transmitting system.

[0022] Preferably, in this embodiment, the transmitting system is configured to include: a lens, a reflector and a filter.

[0023] Preferably, in this embodiment, the receiving part includes: an analog front end, a detection receiver and a receiving system. The analog front end is used for channel selection and analog signal amplification, and performs signal detection through the detection receiver. The receiving system then receives the signal transmitted back by the target object.

[0024] Preferably, in this embodiment, the detection receiver includes: APD, SiPM and SPAD, and the receiving system includes: lens, reflector, filter, SiPM and SPAD.

[0025] It should be specifically explained that: by specifically explaining the transmitting part and the receiving part, the laser driver of the transmitting part is used to drive the laser source to generate signal pulses, and transmit the laser to the target object through the transmitting system, and the analog front end of the receiving part is used for channel selection and analog signal amplification, and the signal is detected through the detection receiver, and then the receiving system receives the signal sent back by the target object, thereby realizing the transmission and reception of the laser radar system. Example

[0026] See also Figure 1 , a commercial vehicle-mounted 1550nm fiber laser radar system, uses 1550nm fiber laser, has the advantages of narrow linewidth, high precision, miniaturization, high power, easy integration and easy control, laying a solid foundation for high-performance laser radar systems, including: transmitting part, receiving part, scanning system and information processing.

[0027] Specifically, the transmitting part: the excitation source periodically drives the light source to transmit signals, the modulator controls the direction and number of lines of the transmitted signal through the beam controller, and finally the laser is transmitted to the target object through the transmitting system; the receiving part: the receiving system receives the signal sent back by the target object to generate a receiving signal; the scanning system: rotates at a stable speed to scan the plane and generate real-time plane map information; information processing: the received signal is amplified and converted from digital to analog, and is calculated by the information processing module to obtain the characteristics of the target surface morphology and physical properties, and finally establish an object model.

[0028] Preferably, in this embodiment, the scanning system comprises: a scanner driver and a scanner, the scanner driver is used to drive the scanner to achieve deflection and angle, and the scanner comprises: a motor, a MEMS and a microlens.

[0029] Preferably, in this embodiment, the information processing includes a main control module, which is used to implement timing control, waveform algorithm processing, control of other functions of the laser radar, and generate point cloud data.

[0030] It should be specifically explained that: by specifically explaining the scanning system and information processing, the scanner driver of the scanning system is used to drive the scanner to achieve deflection and angle, and the information processing sets the main control module, and the main control module is used to achieve timing control, waveform algorithm processing, other function control of the laser radar and generate point cloud data, thereby realizing the scanning and information processing of the laser radar system. Example

[0031] See also Figure 1 , a commercial vehicle-mounted 1550nm fiber laser radar system, uses 1550nm fiber laser, has the advantages of narrow linewidth, high precision, miniaturization, high power, easy integration and easy control, laying a solid foundation for high-performance laser radar systems, including: transmitting part, receiving part, scanning system and information processing.

[0032] Specifically, the transmitting part: the excitation source periodically drives the light source to transmit signals, the modulator controls the direction and number of lines of the transmitted signal through the beam controller, and finally the laser is transmitted to the target object through the transmitting system; the receiving part: the receiving system receives the signal sent back by the target object to generate a receiving signal; the scanning system: rotates at a stable speed to scan the plane and generate real-time plane map information; information processing: the received signal is amplified and converted from digital to analog, and is calculated by the information processing module to obtain the characteristics of the target surface morphology and physical properties, and finally establish an object model.

[0033] Preferably, in this embodiment, the transmitting part includes: a laser driver, a laser source and a transmitting system, and the laser driver is used to drive the laser source to generate a signal pulse, and transmit the laser to the target object through the transmitting system.

[0034] Preferably, in this embodiment, the transmitting system is configured to include: a lens, a reflector and a filter.

[0035] Preferably, in this embodiment, the receiving part includes: an analog front end, a detection receiver and a receiving system. The analog front end is used for channel selection and analog signal amplification, and performs signal detection through the detection receiver. The receiving system then receives the signal transmitted back by the target object.

[0036] Preferably, in this embodiment, the detection receiver includes: APD, SiPM and SPAD, and the receiving system includes: lens, reflector, filter, SiPM and SPAD.

[0037] Preferably, in this embodiment, the scanning system comprises: a scanner driver and a scanner, the scanner driver is used to drive the scanner to achieve deflection and angle, and the scanner comprises: a motor, a MEMS and a microlens.

[0038] Preferably, in this embodiment, the information processing includes a main control module, which is used to implement timing control, waveform algorithm processing, control of other functions of the laser radar, and generate point cloud data.

[0039] It should be noted that: it meets the safety requirements of the human eye: it adopts a 1550nm wavelength laser radar, which is of vital importance to safe driving. It can meet the safety requirements of the human eye even under relatively high power conditions. It has strong anti-interference ability: the light source has high brightness, better light beam collimation, and strong resistance to sunlight interference. In a real environment, the water absorption rate of 1550nm is stronger than that of 905nm, and it has better resistance to light interference. It also has huge advantages in the perception ability in bad weather. It has a long detection distance: the detection distance can reach up to 500 meters, and can reach 250 meters under a reflectivity of 10%. Early detection and perception at a long enough distance are the key to reserving enough time to react. It has high detection accuracy: angular resolution refers to the resolution ability of the imaging system, which determines whether all objects in the scene can be seen clearly and accurately. The angular resolution of the laser radar system can reach 0.06°*0.06°, which is true image-level accuracy. And reliability: the optical fiber architecture design is stable and reliable, and can meet the performance and safety requirements of vehicle regulations for sensing elements.

[0040] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0041] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A commercial vehicle-mounted 1550nm fiber laser radar system, which uses a 1550nm fiber laser and has the advantages of narrow line width, high precision, miniaturization, high power, easy integration and easy control, laying a solid foundation for high-performance laser radar systems, characterized in that: include: Transmitting part, receiving part, scanning system and information processing; Transmitting part: The excitation source periodically drives the light source to transmit signals, the modulator controls the direction and number of lines of the transmitted signal through the beam controller, and finally the laser is transmitted to the target object through the transmitting system; Receiving part: The receiving system receives the signal sent back by the target object and generates a receiving signal; Scanning system: rotates at a stable speed to scan the plane and generate real-time plane map information; Information processing: The received signal is amplified and converted from digital to analog, and then calculated by the information processing module to obtain the characteristics of the target surface morphology and physical properties, and finally establish an object model.

2. The commercial vehicle-mounted 1550nm fiber laser radar system according to claim 1 is characterized in that: The emission part includes: a laser driver, a laser source and an emission system. The laser driver is used to drive the laser source to generate a signal pulse and emit the laser to the target object through the emission system.

3. The commercial vehicle-mounted 1550nm fiber laser radar system according to claim 2 is characterized in that: The emission system is configured to include a lens, a reflector and a filter.

4. The commercial vehicle-mounted 1550nm fiber laser radar system according to claim 1 is characterized in that: The receiving part includes: an analog front end, a detection receiver and a receiving system. The analog front end is used for channel selection and analog signal amplification, and performs signal detection through the detection receiver. The receiving system then receives the signal sent back by the target object.

5. The commercial vehicle-mounted 1550nm fiber laser radar system according to claim 4 is characterized in that: The detection receiver includes: APD, SiPM and SPAD, and the receiving system includes: lens, reflector, filter, SiPM and SPAD.

6. The commercial vehicle-mounted 1550nm fiber laser radar system according to claim 1, characterized in that: The scanning system comprises: a scanner driver and a scanner, wherein the scanner driver is used to drive the scanner to achieve deflection and angle.

7. The commercial vehicle-mounted 1550nm fiber laser radar system according to claim 6, characterized in that: The scanner includes: a motor, a MEMS and a microlens.

8. The commercial vehicle-mounted 1550nm fiber laser radar system according to claim 1, characterized in that: The information processing includes a main control module, which is used to realize timing control, waveform algorithm processing, other function control of the laser radar and generate point cloud data.

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