CN114488196A - Highway distributed visibility remote sensing system - Google Patents
Highway distributed visibility remote sensing system Download PDFInfo
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- CN114488196A CN114488196A CN202111498342.7A CN202111498342A CN114488196A CN 114488196 A CN114488196 A CN 114488196A CN 202111498342 A CN202111498342 A CN 202111498342A CN 114488196 A CN114488196 A CN 114488196A
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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
- G01S17/88—Lidar systems specially adapted for specific applications
- G01S17/95—Lidar systems specially adapted for specific applications for meteorological use
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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
- G01S17/003—Bistatic lidar systems; Multistatic lidar systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01W—METEOROLOGY
- G01W1/00—Meteorology
- G01W1/10—Devices for predicting weather conditions
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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 discloses a highway distributed visibility remote sensing system, which comprises: at least one laser; a plurality of telescopes; at least one detector; a signal processing unit. The highway distributed visibility remote sensing system transmits laser into the telescope by utilizing the laser generated by the laser, then emits the laser into the atmosphere to form a corresponding echo signal, the telescope receives the echo signal and then transmits the echo signal into the detector, and the echo signal is input into the signal processing unit after being detected to obtain corresponding visibility. The invention provides a scheme for laying long-distance optical fibers in a targeted manner, thereby reducing the cost of visibility detection, improving the distance of visibility detection and solving the problems of high price and small detection range of visibility laser radar.
Description
Technical Field
The invention relates to the field of visibility measurement of expressways, in particular to a distributed visibility remote sensing system for expressways.
Background
Visibility is an important index for opening or closing of a highway, and the probability of traffic accidents is greatly improved under the condition of low visibility. Visibility has therefore been a routine monitoring item in the highway field. Existing measurement techniques fall into two main categories.
One type of such instruments is in-situ measurement, including forward scatter and side scatter. The in-situ measuring instrument can only measure the air between the transmitter and the receiver, and the visibility of the air is regarded as the visibility of the expressway. The disadvantage of this method is obvious in that it is not possible to know whether there is a change in visibility along the highway, and only one value can be obtained at a time. In fact, due to the existence of weather phenomena such as fog, the visibility on the highway varies greatly, and the application of the in-situ measuring instrument is greatly limited.
The second category is the use of visibility lidar. Visibility lidar utilizes backscatter attenuation of laser light to obtain visibility at different points along a path. Although it has good temporal, spatial and angular resolution, it also has significant drawbacks. One is that the detection distance is only several kilometers, and for a highway extending thousands of kilometers, one laser radar can not finish the visibility detection task far away. Secondly, the cost is high, the cost of one visibility laser radar is about 50 ten thousand at present, if the highway of 1000 kilometers is wanted to be covered, the total cost is 5000 ten thousand, which is obviously a very high price and is also an important reason that the visibility laser radar is not popularized in a large scale.
Disclosure of Invention
The invention provides a distributed highway visibility remote sensing system for solving the problems of high price and small detection range of visibility laser radar. The invention provides a scheme for laying long-distance optical fibers in a targeted manner, thereby reducing the cost of visibility detection and improving the distance of visibility detection.
In order to achieve the purpose, the invention adopts the following technical scheme: a highway distributed visibility remote sensing system, comprising:
at least one laser for generating laser light;
a plurality of telescopes for emitting the laser light into the atmosphere and receiving echo signals generated by the laser light in the atmosphere;
at least one detector for detecting the echo signals;
the signal processing unit is used for measuring the visibility corresponding to the position of the telescope according to the detected echo signal;
the highway distributed visibility remote sensing system transmits laser into the telescope by utilizing the laser generated by the laser, then emits the laser into the atmosphere to form a corresponding echo signal, the telescope receives the echo signal and then transmits the echo signal into the detector, and the echo signal is input into the signal processing unit after being detected to obtain corresponding visibility.
As a further improvement of the above scheme, the number of the lasers is one, and the lasers are installed at the midpoint of the section of the highway where the visibility is to be tested, and the plurality of telescopes are installed on the section to be tested at equal intervals along the extending direction of the highway; the number of the detectors is multiple and is matched with the plurality of telescopes; the signal processing unit drives the laser to sequentially light different telescopes along the testing direction.
Preferably, the highway distributed visibility remote sensing system further comprises:
a timing control system for generating a control timing;
and the signal processing unit drives the laser to sequentially light different telescopes along the testing direction according to the control time sequence.
As a further improvement of the above scheme, the number of the detectors is one, the detectors are installed at the midpoint of the section of the highway where the visibility is to be tested, and the plurality of telescopes are installed on the section to be tested at equal intervals along the extending direction of the highway; the number of the lasers is multiple and the lasers are paired with the multiple telescopes; and the signal processing unit drives the detector to sequentially detect echo signals of different telescopes.
Preferably, the highway distributed visibility remote sensing system further comprises:
a timing control system for generating a control timing;
the signal processing unit drives the detector to sequentially receive echo signals formed by the laser emitted by different telescopes in the atmosphere according to the control time sequence.
As a further improvement of the above scheme, the number of the lasers and the number of the detectors are both one and are both installed at the midpoint of the section of the highway where visibility is to be tested, and the plurality of telescopes are installed on the section to be tested at equal intervals along the extending direction of the highway; the signal processing unit drives the laser to sequentially light different telescopes along the testing direction, and correspondingly drives the detector to sequentially detect echo signals of the different telescopes at the same time.
Preferably, the highway distributed visibility remote sensing system further comprises:
a timing control system for generating a control timing;
and the signal processing unit drives the laser to sequentially light different telescopes along the testing direction according to the control time sequence.
And the signal processing unit drives the detector to sequentially receive echo signals formed by the laser emitted in the atmosphere by different telescopes according to the control time sequence.
As a further improvement of the scheme, the highway distributed visibility remote sensing system realizes networking among all components by building an optical fiber link.
Preferably, the optical fiber link is built by using a high-power optical fiber.
The highway distributed visibility remote sensing system has three different implementation modes, namely a laser, a plurality of detectors and a plurality of telescopes; a plurality of lasers, a detector and a plurality of telescopes; one laser, one detector and a plurality of telescopes. The scheme can be comprehensively considered according to the cost of laying the optical fiber link locally, the latest price of the laser and the latest price of the detector. Although the cost is greatly reduced, for each observation interval, a complete visibility laser radar system is adopted, so that all the advantages of the visibility laser radar are continued, the detected visibility has good space-time resolution, and the position of the group fog can be accurately identified. The whole distributed network of the invention shares a time sequence control system and a software processing system, thereby not only reducing the cost, but also facilitating the real-time troubleshooting of faults and the complete detection of different visibility of thousands of kilometers of expressways.
Drawings
Fig. 1 is a schematic diagram of a first layout structure of a distributed visibility remote sensing system for an expressway according to the present invention.
Fig. 2 is a schematic diagram of a second layout structure of the distributed visibility remote sensing system for the expressway in the invention.
Fig. 3 is a schematic diagram of a third layout structure of the distributed visibility remote sensing system for the expressway of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
The highway distributed visibility remote sensing system mainly aims at solving the problems that visibility laser radar is expensive and the detection range is small, and the scheme of laying long-distance optical fibers is purposefully provided, so that the visibility detection cost is reduced, and the visibility detection distance is increased.
The highway distributed visibility remote sensing system mainly comprises at least one laser, a plurality of telescopes, at least one detector and a signal processing unit. The signal processing unit is provided with a software processing system. The number of the lasers and the detectors is different, and different layout structures are presented. The highway distributed visibility remote sensing system realizes networking among all components by building an optical fiber link, so that a laser radar networking scheme of multiple telescopes is realized by the laser, the telescope, the detector and the signal processing unit.
The laser is used for generating laser; the telescope is used for emitting the laser into the atmosphere and receiving an echo signal generated by the laser in the atmosphere; the detector is used for detecting the echo signal; the signal processing unit is used for measuring the visibility corresponding to the position of the telescope according to the detected echo signal. The echo signal detection of the detector and the visibility analysis of the signal processing unit can be performed by the prior art and are not described in detail here.
The highway distributed visibility remote sensing system transmits laser into the telescope by utilizing the laser generated by the laser, then emits the laser into the atmosphere to form a corresponding echo signal, the telescope receives the echo signal and then transmits the echo signal into the detector, and the echo signal is input into the signal processing unit after being detected to obtain corresponding visibility.
The highway distributed visibility remote sensing system has three different layout structures, and detailed key introduction is carried out next.
Please refer to fig. 1 for a first layout structure. The highway distributed visibility remote sensing system comprises a laser, a plurality of detectors, a plurality of telescopes, a time sequence control system and a software processing system.
The laser is arranged at the middle point of the section of the highway where visibility is to be tested, and the plurality of telescopes are arranged on the section to be tested at equal intervals along the extending direction of the highway; the number of the detectors is multiple and is paired with the multiple telescopes.
The software processing system is installed in a signal processing unit in a software form, and the signal processing unit can be a computer, a mobile phone and other electronic equipment with intelligence. And the signal processing unit drives the laser to sequentially light different telescopes along the testing direction. In order to ensure that all parts of the highway distributed visibility remote sensing system work orderly, the invention presents a certain control method through a control time sequence output by a time sequence control system, and the signal processing unit drives the laser to sequentially light different telescopes along a test direction according to the control time sequence to measure the visibility of the whole highway. The distributed visibility remote sensing system of the expressway can be controlled to be switched on and off by the sequential control system in a unified manner, so that ordered work of all parts is guaranteed.
Therefore, the first layout structure is a laser, a plurality of detectors and a plurality of telescopes. A single laser is mounted at the mid-point of the section of the highway. The detector and the telescope are matched and respectively installed on different point positions of the highway at equal intervals. The sequential control system controls the laser to sequentially light different telescopes, so that the measurement of the visibility of the whole highway is realized.
In this embodiment, the light source is connected to a1 x 2 optical switch. First, the optical switch is switched to enter the polarization beam splitter directly without passing through the faraday rotator, and the indications a1 and b1 at this time are recorded by the power meter 1 and the power meter 2, respectively. The optical switch was then switched to let the light pass through the faraday rotator and the readings a2 and b2 were recorded by dynamometer 1 and dynamometer 2, respectively. The depolarization ratio of the system is scaled by (a1+ a2)/(b1+ b 2). Therefore, the depolarization ratio calibration system based on the Faraday rotator enables the whole distributed network to share one time sequence control system and one software processing system, so that the cost is reduced, and the real-time troubleshooting of faults and the complete detection of different visibility of thousands of kilometers of expressways are facilitated.
Please refer to fig. 2 for a second layout structure. The highway distributed visibility remote sensing system comprises a plurality of lasers, a detector, a plurality of telescopes, a time sequence control system and a software processing system.
The detector is arranged at the middle point of the section of the highway where visibility is to be tested, and the plurality of telescopes are arranged on the section to be tested at equal intervals along the extending direction of the highway; the number of the lasers is multiple and the lasers are paired with the multiple telescopes; and the signal processing unit drives the detector to sequentially detect echo signals of different telescopes.
In order to ensure that all parts of the highway distributed visibility remote sensing system work in order, the invention presents a certain control method through a control time sequence output by a time sequence control system, and the signal processing unit drives the detector to sequentially receive echo signals formed by the laser emitted by different telescopes in the atmosphere according to the control time sequence so as to measure the visibility of the whole highway. The distributed visibility remote sensing system on the expressway can also be controlled to be switched on and off by the sequential control system in a unified manner, so that all parts can work in order.
Therefore, the second layout structure is a plurality of lasers, a detector and a plurality of telescopes. The only one detector is installed at the middle point of the section of the highway. The laser and the telescope are matched and respectively installed on different points of the highway at equal intervals. The time sequence control system controls the detector to sequentially detect echo signals of different telescopes, and measurement of visibility of the whole highway is achieved.
Please refer to fig. 3 for a third layout structure. The highway distributed visibility remote sensing system comprises a laser, a detector, a plurality of telescopes, a time sequence control system and a software processing system.
The number of the lasers and the number of the detectors are one, the lasers and the detectors are both arranged at the middle point of the section of the highway where visibility is to be tested, and the telescopes are arranged on the section to be tested at equal intervals along the extending direction of the highway; the signal processing unit drives the laser to sequentially light different telescopes along the testing direction, and correspondingly drives the detector to sequentially detect echo signals of the different telescopes at the same time.
In order to ensure that all parts of the highway distributed visibility remote sensing system work in order, the invention presents a certain control method through a control time sequence output by a time sequence control system, the signal processing unit drives the laser to sequentially light different telescopes along a test direction, and correspondingly drives the detector to sequentially detect echo signals of the different telescopes at the same time, so as to measure the visibility of the whole highway. The distributed visibility remote sensing system of the expressway can be controlled to be switched on and off by the sequential control system in a unified manner, so that ordered work of all parts is guaranteed.
Therefore, the third layout structure is a laser, a detector and a plurality of telescopes. The only detector and laser are installed at the middle point of the section of the highway. The telescopes are arranged on different point positions of the highway at equal intervals. The time sequence control system controls the laser to sequentially light different telescopes, and controls the detector to sequentially detect echo signals of the different telescopes, so that the measurement of the visibility of the whole highway is realized.
The highway distributed visibility remote sensing system realizes networking among all components by building an optical fiber link. High-power optical fibers for transmitting laser emitted by a laser are required to be used in the optical fiber links of the first layout structure and the third layout structure, and the laying cost of the optical fiber links of thousands of kilometers is high; the second scheme only needs to use common optical fibers, and the cost of 1km of paving materials is about 200 RMB. However, in any scheme, compared with the traditional multi-laser, multi-detector and multi-telescope laser radar networking scheme, the cost is obviously reduced. Therefore, the invention subverts the networking mode of the traditional visibility laser radar by building the optical fiber link, and greatly saves the cost of the laser and the detector.
The highway distributed visibility remote sensing system utilizes the Chinese optical fiber communication technology which is developed at a high speed in recent years, and the optical fiber link is applied to the aspect of detecting visibility by using a laser radar, so that the cost of long-distance visibility detection is greatly reduced, the visibility detection with angle resolution and space resolution is realized, and the distance of the occurrence of the fog can be accurately detected.
The three layout structures can comprehensively consider which scheme is selected according to the cost of laying the optical fiber link locally, the latest price of the laser and the latest price of the detector. Although the highway distributed visibility remote sensing system greatly reduces the cost, each observation interval is a set of complete visibility laser radar system, so all the advantages of visibility laser radar are continued, the detected visibility has good space-time resolution, and the position of the foggy group can be accurately identified. Meanwhile, the whole distributed network shares a time sequence control system and a software processing system, so that the cost is reduced, and the real-time troubleshooting of faults and the complete detection of different visibility of thousands of kilometers of expressways are facilitated.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A highway distributed visibility remote sensing system, comprising:
at least one laser for generating laser light;
a plurality of telescopes for emitting the laser light into the atmosphere and receiving echo signals generated by the laser light in the atmosphere;
at least one detector for detecting the echo signals;
the signal processing unit is used for measuring the visibility corresponding to the position of the telescope according to the detected echo signal;
the highway distributed visibility remote sensing system transmits laser into the telescope by utilizing the laser generated by the laser, then emits the laser into the atmosphere to form a corresponding echo signal, the telescope receives the echo signal and then transmits the echo signal into the detector, and the echo signal is input into the signal processing unit after being detected to obtain corresponding visibility.
2. The highway distributed visibility remote sensing system of claim 1,
the number of the lasers is one, the lasers are arranged at the middle point of the section of the highway where visibility is to be tested, and the plurality of telescopes are arranged on the section to be tested at equal intervals along the extending direction of the highway; the number of the detectors is multiple and is matched with the plurality of telescopes; the signal processing unit drives the laser to sequentially light different telescopes along the testing direction.
3. The distributed highway visibility remote sensing system according to claim 2, further comprising:
a timing control system for generating a control timing;
and the signal processing unit drives the laser to sequentially light different telescopes along the testing direction according to the control time sequence.
4. The distributed highway visibility remote sensing system according to claim 1, wherein:
the number of the detectors is one, the detectors are arranged at the middle point of the section of the highway where the visibility is to be tested, and the plurality of telescopes are arranged on the section to be tested at equal intervals along the extending direction of the highway; the number of the lasers is multiple and the lasers are paired with the multiple telescopes; and the signal processing unit drives the detector to sequentially detect echo signals of different telescopes.
5. The distributed highway visibility remote sensing system according to claim 4, further comprising:
a timing control system for generating a control timing;
the signal processing unit drives the detector to sequentially receive echo signals formed by the laser emitted by different telescopes in the atmosphere according to the control time sequence.
6. The highway distributed visibility remote sensing system of claim 1,
the number of the lasers and the number of the detectors are one, the lasers and the detectors are both arranged at the middle point of the section of the highway where visibility is to be tested, and the telescopes are arranged on the section to be tested at equal intervals along the extending direction of the highway; the signal processing unit drives the laser to sequentially light different telescopes along the testing direction, and correspondingly drives the detector to sequentially detect echo signals of the different telescopes at the same time.
7. The distributed highway visibility remote sensing system according to claim 6, further comprising:
a timing control system for generating a control timing;
and the signal processing unit drives the laser to sequentially light different telescopes along the testing direction according to the control time sequence.
And the signal processing unit drives the detector to sequentially receive echo signals formed by the laser emitted in the atmosphere by different telescopes according to the control time sequence.
8. The distributed highway visibility remote sensing system according to any one of claims 1-7, wherein the distributed highway visibility remote sensing system realizes networking among various components by building optical fiber links.
9. The distributed highway visibility remote sensing system according to claim 8, wherein the fiber optic link is constructed using high power optical fiber.
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| CN202111498342.7A CN114488196A (en) | 2021-12-09 | 2021-12-09 | Highway distributed visibility remote sensing system |
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| CN202111498342.7A CN114488196A (en) | 2021-12-09 | 2021-12-09 | Highway distributed visibility remote sensing system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115508853A (en) * | 2022-11-04 | 2022-12-23 | 青岛镭测创芯科技有限公司 | Speed measuring device, laser speed measuring method, system and medium |
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2021
- 2021-12-09 CN CN202111498342.7A patent/CN114488196A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115508853A (en) * | 2022-11-04 | 2022-12-23 | 青岛镭测创芯科技有限公司 | Speed measuring device, laser speed measuring method, system and medium |
| CN115508853B (en) * | 2022-11-04 | 2023-03-10 | 青岛镭测创芯科技有限公司 | Speed measuring device, laser speed measuring method, system and medium |
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