CN204719233U - A kind of target detection unit based on double-frequency laser - Google Patents
A kind of target detection unit based on double-frequency laser Download PDFInfo
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- CN204719233U CN204719233U CN201520424341.1U CN201520424341U CN204719233U CN 204719233 U CN204719233 U CN 204719233U CN 201520424341 U CN201520424341 U CN 201520424341U CN 204719233 U CN204719233 U CN 204719233U
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Abstract
The utility model discloses a kind of target detection unit based on double-frequency laser, organically can integrate finding range and testing the speed, utilize double-frequency laser to carry out the twofold detection of target velocity and distance.This device comprises: laser instrument, the first beam splitter, acousto-optic modulator, the first coupling mechanism, optical transmitting and receiving system, telescopic system, the second beam splitter, the second coupling mechanism, the first photodetector, the first bandpass filter, the second photodetector, the second bandpass filter, speed measuring module, range finder module and control module; The utility model utilizes acousto-optic modulator to produce double-frequency laser, realizes testing the speed.Control module changes the shift frequency frequency of acousto-optic modulator simultaneously, produces different double-frequency lasers, thus forms different difference frequency survey chis, to realize range finding.
Description
Technical field
The utility model relates to technical field of laser detection, is specifically related to a kind of target detection unit based on double-frequency laser.
Background technology
The electromagnetic wave of radar emission is with modulated after objectives interation, and therefore, echoed signal comprises target signature information.By signal processing technology, the information such as range-to-go, speed.
Double-frequency laser is that one combines laser radar and radio radar, and with double-frequency laser as detection medium, the light that radio radar technology carries out signal transacting carries microwave laser Radar Technology.Existing double-frequency laser major part produces the vertical laser in two bundle polarization directions by single laser instrument, finally synthesizes beat signal.Also have at present and utilize acousto-optic modulator to carry out shift frequency to produce the implementation that the identical laser in two bundle polarization directions synthesizes beat signal again.But such scheme is used for all greatly testing the speed.Range finding and testing the speed organically is not integrated.
Utility model content
In view of this, the utility model provides a kind of target detection unit based on double-frequency laser, and organically can integrate finding range and testing the speed, utilize double-frequency laser to carry out the twofold detection of target velocity and distance, work efficiency is high.
In order to solve the problems of the technologies described above, the utility model is achieved in that
Based on a target detection unit for double-frequency laser, comprising: laser instrument, the first beam splitter, acousto-optic modulator, the first coupling mechanism, optical transmitting and receiving system, telescopic system, the second beam splitter, the second coupling mechanism, the first photodetector, the first bandpass filter, the second photodetector, the second bandpass filter, speed measuring module, range finder module and control module;
It is ω that laser instrument produces frequency
ishoot laser export the first beam splitter to;
In the two-way beam splitting output terminal of the first beam splitter, a road connects the first input end of the first coupling mechanism via acousto-optic modulator, and the second input end of the first coupling mechanism is directly accessed on another road; Acousto-optic modulator is used for carrying out shift frequency to the laser entered, and after obtaining shift frequency, frequency is ω
i+ ω
silaser; Control module connects acousto-optic modulator, for controlling the shift frequency frequencies omega of acousto-optic modulator
si;
The two-way entered is swashed combiner and becomes double-frequency laser by the first coupling mechanism, then beam splitting is A, B two-way; Wherein, B road enters the second beam splitter beam splitting is a, b two-way; Wherein a road is input to the first input end of the second coupling mechanism as double frequency local oscillator laser, and b road enters the second photodetector as double frequency reference laser, and A road directly acts on target as detection light through optical transmitting and receiving system and telescopic system and detects;
Second input end of echo laser transfer to the second coupling mechanism that detection light is formed by optical transmitting and receiving system after target reflects and again received by telescopic system; Second coupling mechanism transfers to the first photodetector after carrying out mixing to the double frequency local oscillator laser of input and echo laser;
The coherent signal of the double frequency local oscillator laser detected and echo laser is transferred to speed measuring module and range finder module via the first bandpass filter by the first photodetector; The double frequency reference laser detected is transferred to range finder module via the second bandpass filter by the second photodetector;
Speed measuring module utilizes described coherent signal solving target velocity information;
Range finder module utilizes different shift frequency frequencies omega after utilizing described coherent signal and double frequency reference laser to calculate phase information
sicorresponding phase information solving target range information.
Preferably, described speed measuring module and described range finder module realize in dsp.
Beneficial effect:
Range finding and testing the speed organically is integrated by the utility model, double-frequency laser is utilized to carry out the twofold detection of target velocity and distance, adopt coherent detection technology during detection, utilize difference frequency to calculate the movement velocity of target, have that antijamming capability is strong, detection accuracy is high and etc. advantage.Many groups double-frequency laser can obtain several difference frequencies and survey chi, and then obtain target range, computing speed is fast.And finding range and testing the speed to adopt same set of equipment to realize.
The generation of the utility model double-frequency laser is the shift frequency by acousto-optic modulator, instead of the laser signal that conventional two bundles used are orthogonal, double-frequency laser production process is more prone to and is convenient to control frequency shift amount.
The utility model is to testing the speed and find range the organic combination carried out, and make whole device device used few, compact conformation, device volume is little.
Accompanying drawing explanation
Fig. 1 is the composition schematic diagram of the utility model based on the target detection unit of double-frequency laser.
Embodiment
To develop simultaneously embodiment below in conjunction with accompanying drawing, the utility model is described in detail.
The utility model provides a kind of target detection unit based on double-frequency laser, as shown in Figure 1, it comprises laser instrument 1, first beam splitter 2, acousto-optic modulator 3, first coupling mechanism 4, optical transmitting and receiving system 5, telescopic system 6, second beam splitter 7, second coupling mechanism 8, first photodetector 9, first bandpass filter 10, second photodetector 11, second bandpass filter 12, speed measuring module 13, range finder module 14 and control module 15.Speed measuring module 13 and range finder module 14 can adopt DSP to realize, and one piece of DSP can be utilized to realize.
The annexation of above-mentioned building block is:
The output terminal of laser instrument 1 connects the input end of the first beam splitter 2, and an output terminal of the first beam splitter 2 connects the first input end of the first coupling mechanism 4 by acousto-optic modulator 3, another output terminal of the first beam splitter 2 directly connects the second input end of the first coupling mechanism 4.An output terminal of the first coupling mechanism 4 connects the input end of the second beam splitter 7.One of them output terminal of second beam splitter 7 connects the first input end of the second coupling mechanism 8.Another output terminal of first coupling mechanism 4 connects the signal input part to be output of optical transmitting and receiving system 5, and the sending and receiving end of optical transmitting and receiving system 5 connects telescopic system 7; The echoed signal output terminal of optical transmitting and receiving system 5 connects the second input end of the second coupling mechanism 8.
The output terminal that the output terminal of the second coupling mechanism 8 accesses the first bandpass filter 10, first bandpass filter 10 via the first photodetector 9 connects speed measuring module 13 and range finder module 14.The output terminal that another output terminal of second beam splitter 7 accesses the second bandpass filter 12, second bandpass filter 12 via the second photodetector 11 connects range finder module 14.Control module 15 connects the microwave source on acousto-optic modulator 3.Control module 15 can also connect speed measuring module 13 and range finder module 14 further.
The principle of work of this device is:
It is ω that laser instrument 1 produces frequency
ishoot laser export the first beam splitter 2 to.
The laser entered is carried out beam splitting by the first beam splitter 2, wherein a branch ofly enters acousto-optic modulator 3, and carry out shift frequency by acousto-optic modulator 3, after obtaining shift frequency, frequency is ω
i+ ω
silaser, then export the first coupling mechanism 4 to; Another bundle directly exports the first coupling mechanism 4 to.In the first coupling mechanism 4, become frequency to be ω with the sharp combiner of shift frequency the not laser of shift frequency
sidouble-frequency laser.Wherein, the shift frequency frequencies omega of acousto-optic modulator 3
sicontrolled by control module, control module connects the microwave source on acousto-optic modulator 3 specifically, is gone out the modulation of optical frequency shift by microwave source frequency control realization acousto-optic modulator.
First coupling mechanism 4 closes and restraints the double-frequency laser beam splitting obtained is A, B two-way; Wherein, B road enters the second beam splitter 7 beam splitting is a, b two-way; Wherein a road is input to the first input end of the second coupling mechanism 8 as double frequency local oscillator laser, b road enters the second photodetector 11 as double frequency reference laser, A road, as detection light through optical transmitting and receiving system 5 and telescopic system 6, directly acts on target 16 and detects.
Detection light reflects through target and is again received by telescopic system 6, after optical transmitting and receiving system 5, obtains echo laser.Enter the first photodetector 9 after echo laser and double frequency local oscillator laser a carry out mixing in the second coupling mechanism 8, obtain the coherent signal of double frequency local oscillator laser and echo laser.Coherent signal transfers to speed measuring module 13 and range finder module 14 via after the first bandpass filter 10 filtering clutter component.The double frequency reference laser b detected is transferred to range finder module 14 via after the second bandpass filter 12 filtering clutter component by the second photodetector 11.
When testing the speed, speed measuring module 13 utilizes the coherent signal solving target velocity information received.
During range finding, range finder module 14 utilizes the coherent signal that receives and double frequency reference laser b to calculate phase information and stores; Control module 15 changes the shift frequency frequencies omega of acousto-optic modulator 3
si, repeat said process, change each time and all calculate a phase information, utilize the phase information repeatedly calculated, calculate target range information.Wherein, control module 15 can change frequency shift amount ω according to the time interval of setting
si, also can be range finder module 14 after calculating a phase information, notice control module 15 change frequency shift amount ω
si.
The utility model has the advantages that make use of double-frequency laser signal carrys out realize target detection, advantage-spatial resolution that this technology has possessed microwave radar and laser radar is simultaneously high, and detection range is far away; Utilize some groups of two-frequency signals to carry out phase ranging, range is far away, and precision is high; The system integration is tested the speed and distance measurement function, and compact conformation, work efficiency is high, can realize high-precision range finding and test the speed.
In sum, these are only preferred embodiment of the present utility model, be not intended to limit protection domain of the present utility model.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (2)
1. the target detection unit based on double-frequency laser, it is characterized in that, comprising: laser instrument (1), the first beam splitter (2), acousto-optic modulator (3), the first coupling mechanism (4), optical transmitting and receiving system (5), telescopic system (6), the second beam splitter (7), the second coupling mechanism (8), the first photodetector (9), the first bandpass filter (10), the second photodetector (11), the second bandpass filter (12), speed measuring module (13), range finder module (14) and control module (15);
It is ω that laser instrument (1) produces frequency
ishoot laser export the first beam splitter (2) to;
In the two-way beam splitting output terminal of the first beam splitter (2), one tunnel connects the first input end of the first coupling mechanism (4) via acousto-optic modulator (3), and the second input end of the first coupling mechanism (4) is directly accessed on another road; Acousto-optic modulator (3) is for carrying out shift frequency to the laser entered, and after obtaining shift frequency, frequency is ω
i+ ω
silaser; Control module (15) connects acousto-optic modulator (3), for controlling the shift frequency frequencies omega of acousto-optic modulator (3)
si;
The two-way entered is swashed combiner and becomes double-frequency laser by the first coupling mechanism (4), then beam splitting is A, B two-way; Wherein, B road enters the second beam splitter (7) beam splitting is a, b two-way; Wherein a road is input to the first input end of the second coupling mechanism (8) as double frequency local oscillator laser, b road enters the second photodetector (11) as double frequency reference laser, and A road directly acts on target (16) as detection light through optical transmitting and receiving system (5) and telescopic system (6) and detects;
Optical transmitting and receiving system (5) will detect the second input end of echo laser transfer to the second coupling mechanism (8) that light is formed after target (16) reflects and again received by telescopic system (6); Second coupling mechanism (8) transfers to the first photodetector (9) after carrying out mixing to the double frequency local oscillator laser of input and echo laser;
The coherent signal of the double frequency local oscillator laser detected and echo laser is transferred to speed measuring module (13) and range finder module (14) via the first bandpass filter (10) by the first photodetector (9); The double frequency reference laser detected is transferred to range finder module (14) via the second bandpass filter (12) by the second photodetector (11);
Speed measuring module (13) utilizes described coherent signal solving target velocity information;
Range finder module (14) utilizes different shift frequency frequencies omega after utilizing described coherent signal and double frequency reference laser to calculate phase information
sicorresponding phase information solving target range information.
2., as claimed in claim 1 based on the target detection unit of double-frequency laser, it is characterized in that, described speed measuring module (13) and described range finder module (14) realize in dsp.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520424341.1U CN204719233U (en) | 2015-06-18 | 2015-06-18 | A kind of target detection unit based on double-frequency laser |
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| CN201520424341.1U CN204719233U (en) | 2015-06-18 | 2015-06-18 | A kind of target detection unit based on double-frequency laser |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108832474A (en) * | 2018-07-02 | 2018-11-16 | 北京理工大学 | A method of realizing radio frequency strength-modulated pulse laser |
| CN109256658A (en) * | 2018-11-02 | 2019-01-22 | 北京理工大学 | Infrared double-frequency laser system during one kind is tunable |
| CN110268280A (en) * | 2017-01-24 | 2019-09-20 | Hrl实验室有限责任公司 | Double frequency fmcw radar and method |
| WO2019184790A1 (en) * | 2018-03-26 | 2019-10-03 | Huawei Technologies Co., Ltd. | Coherent lidar method and apparatus |
| CN111610510A (en) * | 2019-02-26 | 2020-09-01 | 深圳市速腾聚创科技有限公司 | Laser radar system |
| CN111750972A (en) * | 2020-05-26 | 2020-10-09 | 北京理工大学 | Target vibration measurement method suitable for dual-frequency continuous laser radar |
| CN112003121A (en) * | 2020-08-24 | 2020-11-27 | 中国科学院上海光学精密机械研究所 | Ultra-stable microwave generation device based on dual-frequency Fabry-Perot cavity frequency stabilized laser |
| CN112018591A (en) * | 2020-08-24 | 2020-12-01 | 中国科学院上海光学精密机械研究所 | Ultra-stable microwave generating device based on frequency-stabilized laser of double-frequency optical fiber interferometer |
| CN112835013A (en) * | 2020-12-29 | 2021-05-25 | 北京环境特性研究所 | Target LRCS simulation measurement system and method based on continuous laser |
| CN118294927A (en) * | 2024-06-05 | 2024-07-05 | 上海孛璞半导体技术有限公司 | Frequency shifter module and heterodyne type coherent detection system |
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2015
- 2015-06-18 CN CN201520424341.1U patent/CN204719233U/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110268280A (en) * | 2017-01-24 | 2019-09-20 | Hrl实验室有限责任公司 | Double frequency fmcw radar and method |
| CN110268280B (en) * | 2017-01-24 | 2023-08-08 | Hrl实验室有限责任公司 | Dual-frequency FMCW radar and method |
| US10901089B2 (en) | 2018-03-26 | 2021-01-26 | Huawei Technologies Co., Ltd. | Coherent LIDAR method and apparatus |
| WO2019184790A1 (en) * | 2018-03-26 | 2019-10-03 | Huawei Technologies Co., Ltd. | Coherent lidar method and apparatus |
| CN108832474A (en) * | 2018-07-02 | 2018-11-16 | 北京理工大学 | A method of realizing radio frequency strength-modulated pulse laser |
| CN109256658A (en) * | 2018-11-02 | 2019-01-22 | 北京理工大学 | Infrared double-frequency laser system during one kind is tunable |
| CN111610510A (en) * | 2019-02-26 | 2020-09-01 | 深圳市速腾聚创科技有限公司 | Laser radar system |
| CN111750972A (en) * | 2020-05-26 | 2020-10-09 | 北京理工大学 | Target vibration measurement method suitable for dual-frequency continuous laser radar |
| CN112003121A (en) * | 2020-08-24 | 2020-11-27 | 中国科学院上海光学精密机械研究所 | Ultra-stable microwave generation device based on dual-frequency Fabry-Perot cavity frequency stabilized laser |
| CN112018591B (en) * | 2020-08-24 | 2021-09-07 | 中国科学院上海光学精密机械研究所 | Ultra-stable microwave generating device based on frequency-stabilized laser of double-frequency optical fiber interferometer |
| CN112003121B (en) * | 2020-08-24 | 2021-11-30 | 中国科学院上海光学精密机械研究所 | Ultra-stable microwave generation device based on dual-frequency Fabry-Perot cavity frequency stabilized laser |
| CN112018591A (en) * | 2020-08-24 | 2020-12-01 | 中国科学院上海光学精密机械研究所 | Ultra-stable microwave generating device based on frequency-stabilized laser of double-frequency optical fiber interferometer |
| CN112835013A (en) * | 2020-12-29 | 2021-05-25 | 北京环境特性研究所 | Target LRCS simulation measurement system and method based on continuous laser |
| CN118294927A (en) * | 2024-06-05 | 2024-07-05 | 上海孛璞半导体技术有限公司 | Frequency shifter module and heterodyne type coherent detection system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151021 Termination date: 20190618 |
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| CF01 | Termination of patent right due to non-payment of annual fee |