CN103647907A - Unmanned aerial vehicle multiplex video switching device - Google Patents
Unmanned aerial vehicle multiplex video switching device Download PDFInfo
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- CN103647907A CN103647907A CN201310356116.4A CN201310356116A CN103647907A CN 103647907 A CN103647907 A CN 103647907A CN 201310356116 A CN201310356116 A CN 201310356116A CN 103647907 A CN103647907 A CN 103647907A
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Abstract
The invention discloses an unmanned aerial vehicle multiplex video switching device. According to the multiplex video switching device, a main control unit is controlled with a thumb wheel switch or an industrial personal computer so as to cause the main control unit to drive a multiplex switching unit, so the input not only can be switched to the output, and but also can be outputted to different output channels according to a certain time sequence, and a power amplification circuit is designed in the circuit for video output signals at the same time, so the distributed capacitance can be effectively reduced, the circuit board area can be reduced and the operation of the whole system is more stable. The multiplex switching unit of the invention adopts a eight-channel video high-speed multiplexing chip produced by the MAX company, the switching time is 40ns, and compared with a multiplex mechanical switch of a passive switching device, the large contact noise problem occurring in the switching process does not exist, and the poor contact problem also does not exist.
Description
Technical field
The present invention relates to a kind of unmanned plane multi-channel video switch, particularly a kind of unmanned plane multichannel realtime graphic switch, belongs to technical field of video processing.
Background technology
Unmanned plane technology is the important development direction of 21 century military equipment technology, and in the local war several times over nearly 10 years, unmanned plane has all been brought into play huge power.Due to unmanned plane, there is the unique advantages such as depth far away, round-the-clock, real time reconnaissance location, be applied to very soon taking photo by plane, the field such as aerial reconnaissance.Along with unmanned plane is taken photo by plane with the extensive application of aerial reconnaissance technology and in order better to allow ground control control the attitude that personnel understand unmanned plane self in real time, increasing unmanned plane is provided with monitoring camera on fuselage both at home and abroad.Owing to being subject to the restriction of unmanned plane test remote measurement transmission equipment, be that remote-measuring equipment can only transmission of one line vision signal, and unmanned plane during flying need to be monitored and record in real time to the multi-channel video signal in the whole flight system of unmanned plane, therefore, a kind of multi-channel video switched system need to be provided, for ground staff in unmanned plane airflight process can be switched between a plurality of airborne cameras, whether monitoring unmanned plane body and attitude be normal, takes solution timely according to the problem of finding.
Early stage Multi-Video Switching Technology adopts common passive and active mode, and passive switch is that a N selects one multichannel mechanical switch, and advantage is simple to operate, and shortcoming is that contact noise is large, and gets an electric shock and be prone to loose contact, does not substantially adopt at present.Active switch adopts general analog switching ic mostly, and advantage is that structure and operation are comparatively simple, but can only switch and can not realize automatic switchover in the mode of manual button.Common passive and active switch easily makes image frame switch moment generation shake in addition.
Summary of the invention
Technology of the present invention is dealt with problems: overcome the deficiencies in the prior art, a kind of unmanned plane multi-channel video switch is provided, volume is little, switching noise is low, and job stability, reliability are high.
Technical solution of the present invention: a kind of unmanned plane multi-channel video switch, by multichannel, select switch unit, automatic gain control unit, power amplification unit, main control unit and power conversion unit form, multi-channel video signal inputs to multichannel and selects in switch unit, main control unit sends channel selecting instruction and controls multichannel and select switch unit to choose a wherein road vision signal to enter automatic gain control unit, the vision signal being selected regulates automatically through the automatic gain control unit amplitude of carrying out successively, after carrying out power amplification, exports as video output signals power amplification unit, power conversion unit is used to main control unit, multichannel is selected switch unit, automatic gain control unit and power amplification unit provide stable power supply.
Described multichannel selects switch unit to adopt chip MAX4315.
Described automatic gain control unit is by filter circuit, amplifying circuit, separated detecting circuit and automatic gain amplifying circuit form, through multichannel, selecting vision signal that switch unit selects to enter amplifying circuit after circuit denoising after filtering amplifies, match circuit compares the normalized video standard signal of output by the vision signal after amplifying and the inner fiducial value arranging, the video standard signal of match circuit output is carried out to separation with separated detecting circuit and detection rectification makes it to become with the strong and weak direct-current control voltage changing of vision signal, the DC point of this direct-current control voltage control automatic gain amplifying circuit makes to change the gain of automatic gain amplifying circuit, thereby the output signal of automatic gain amplifying circuit feeds back to the stable output that filter circuit is realized automatic gain control unit.
The present invention's advantage is compared with prior art as follows:
(1) the multi-channel video switch of the present invention's design, adopting thumbwheel switch or industrial computer to control main control unit drives multichannel to select switch unit, not only input can be switched to output, can also output to according to certain sequential different output channels, in circuit simultaneously for video output signals has designed power amplification circuit, effectively reduce distributed capacitance, save the area of circuit board and make whole system operation more stable.
(2) multichannel of the present invention is selected the 8 passage video high-speed, multi-path multiplexing chip that switch unit is used MAX company to produce, switching time 40ns, compare the multichannel mechanical switch of passive switch, not having switching is the large problem of contact noise occurring, does not also have poor contact of contacts.
Accompanying drawing explanation
Fig. 1 is system composition diagram of the present invention;
Fig. 2 is the schematic diagram of realizing of multi-channel video switching;
Fig. 3 is the fundamental diagram of automatic gain control unit;
Fig. 4 is the software flow pattern of main control unit.
Embodiment
As shown in Figure 1, this multi-channel video switch is selected switch unit by multichannel, automatic gain control unit, power amplification unit, main control unit and power conversion unit form, airborne camera is installed in unmanned plane and for monitoring unmanned plane structure, unmanned plane during flying is played safely to the position of key effect, guarantee camera alignment machine body structure, in several airborne cameras while courses of work, visual field covers full machine, the multi-channel video signal of recording camera generation inputs to multichannel and selects in switch unit, main control unit sends channel selecting instruction and controls multichannel and select switch unit to choose a wherein road vision signal to enter automatic gain control unit, by multichannel, select switch unit select corresponding passage and complete switching, the vision signal being selected regulates automatically through the automatic gain control unit amplitude of carrying out successively, after carrying out power amplification, exports as video output signals power amplification unit, power conversion unit is used to main control unit, multichannel is selected switch unit, automatic gain control unit and power amplification unit provide stable power supply.
1, multichannel is selected switch unit: multichannel selects switch unit to adopt chip MAX4315, and this chip is to have at a high speed, low-power, the gain amplifier of 2V/V that the nearly video amplification chip of eight video channels, and MAX4315 chip internal is integrated.Switch speed 40ns between channel, switch transition 10mVp-p.So this chip is applicable to being applied as the main switch unit chip of video switcher very much.
By the control of main control unit (single-chip microcomputer) and the processing of video switch chip, just can reach the object of selecting a certain road of output vision signal from multi-channel video input signal.As shown in Figure 2, multichannel selects switch unit to be realized by vision signal switch (chip MAX4315), its input can receive 8 tunnel vision signals simultaneously, and under the effect of the channel selecting instruction of exporting at main control unit (single-chip microcomputer MC14053B), select wherein 1 tunnel vision signal and output to automatic gain control unit, thereby realize the handoff functionality of multiselect 1 vision signal.When input video bandwidth is during in 8MHz left and right, the input impedance of all passages of chip MAX4315 is all greater than 10 kilohms, therefore, can not affect the operating state of former airplane synthetic display system.Consider the installation site of multichannel selection switch unit, design 2 kinds of channel selecting modes, and complete by single-chip microcomputer MC14053B.Thereby single-chip microcomputer MC14053B receives the selection instruction generation channel selecting instruction that thumbwheel switch is selected or outside flight control computer transmits and exports to MAX4315 as vision signal " channel selecting instruction " and decoder (adopting chip MC74HC138A), decoder (adopting chip MC74HC138A), as lighting passage indication diode, is pointed out selected passage.
2, automatic gain control unit
Due to switch transmission video signal, so input signal strength changes greatly, and it is not consistent with the dynamic range of system, very easily make switched system cisco unity malfunction, so the introducing of native system novelty automatic gain control unit, the Level hold that makes the outputting video signal of video switcher is certain numerical value, can be when receiving weak signal, and the gain of automatic gain control unit is high; And it is low to gain while receiving strong signal, thereby make the vision signal of output keep proper level.
Automatic gain is controlled will complete the automatic adjusting to video amplitude, is the most important part in design.According to video standard signal, fixedly output amplitude of 1VPP, this control section vision signal that output amplitude is 1VPP are all the time selected in output.As shown in Figure 3, automatic gain control unit is mainly comprised of filter circuit, amplifying circuit, separated detecting circuit and automatic gain amplifying circuit, video is come by Optical Fiber Transmission, after adjusting denoising, enter video amplifier circuit, the feedback of automatic gain control unit obtains vision signal from output, through separated and detection rectification, make it to become the direct-current control voltage that the power with vision signal changes, this Voltage Feedback is controlled the DC point of video amplifier triode, thereby change its gain, reach the object of stable output.It takes out synchronous head peak value as the control voltage of amplifier gain according to the feature of synchronous head amplitude maximum in vision signal, irrelevant with transmitting image content, and can suppress to be mixed in the low-frequency disturbance in vision signal.
Concrete implementation as: automatic gain control unit of the present invention adopts chip MAX7450 to realize, according to MAX7450 instructions for use, allowing input range is (0.5～2.0) VPP, and the video amplitude of output is (1～4) VPP after vision signal switch MAX4315 regulates amplification to process, therefore need between MAX4315 and MAX7450, add resistance pressure-dividing network, make can obtain (0.5～2.0) VPP vision signal at MAX7450 input port.MAX7450, by relatively detecting sync tip level and the inner fiducial value arranging, carries out automatic gain control to the vision signal of input; Through conditioning and optimization, synchronizing signal amplitude is normalized to normal video 1VPP level.MAX7450 output signal gain amplifier is 12Db to the maximum, and minimum is-6Db that the video standard signal that in design, output buffer gain selection 0Db. is finally 1VPP by MAX7450 output amplitude is input to power amplification unit part.
3, power conversion unit
Power conversion is to be 5VDC the airborne 28VDC power conversion of input, for each unit, uses.In order to improve reliability and fail safe, between power supply and voltage transitions chip, designed input reverse-connection protection, voltage transitions chip adopts isolated form chip.Input reverse-connection protective circuit is used for preventing the unexpected reversal connection of power supply and damages; DC-DC power conversion chip adopts gold to rise positive 2405 isolated forms, to improve the reliability of power supply.
4, power amplification unit
In order to make video output unit have stronger load capacity, select chip MAX4380 to carry out power amplification to vision signal, make outputting video signal can drive 1 above 75 ohm load completely.
Main control unit Software for Design: as shown in Figure 4, MC14053B software is comprised of primary control program and these two parts of interrupt service routine.Primary control program mainly completes single-chip microcomputer initialization and arranges and control MC14053B.The output channel of connection MC14053B and input channel, thumbwheel switch channel selecting instruction code, and send into MAX4315 and MC74HC138A by MC14053B, realize channel selecting switching and passage and indicate diode to light.
Interrupt service routine is that selector channel instruction is set is custom-designed in order to receive exterior PC.Once single-chip microcomputer receives PC selector channel request is set, enter immediately interrupt service routine, confirm interrupt requests, the setting of the line correlation port of going forward side by side; Then single-chip microcomputer sends control command and sends into MAX4315 and MC74HC138A by output channel, realizes channel selecting switching and passage and lights.
Multichannel switch test: input respectively several roads vision signal at the input of airborne multi-channel video signal switch, and connect oscilloscope and video display at its output, observe waveform and video image.Fluctuation thumbwheel switch or control inputs value is set by PC, corresponding input channel signal lamp is lighted, and observes corresponding waveform and video image on oscilloscope and video display.When controlling address and occur 110 and 11 combination, signal lamp all extinguishes no signal output, and test result shows, multi-channel video switched system has good handoff functionality.
Stablize amplitude output test: take video color bar signal as example, the input of the color bar signal of flying-spot video generator output being received to multi-channel video switch, output is connected respectively to CH1 and the CH2 passage of general-purpose oscilloscope with the output of flying-spot video generator.Regulate flying-spot video generator amplitude knob, change signal output amplitude, through test repeatedly, multi-channel video switch can be stablized output.Through test proof repeatedly, the unmanned plane multi-channel video switched system function of design is correct, and reliability is high, and volume is little, and low to environment for use requirement, the present invention can be widely used in switching between dual-use multi-cam multi-angle.
The present invention not detailed description is known to the skilled person technology.
Claims (3)
1. a unmanned plane multi-channel video switch, it is characterized in that: by multichannel, select switch unit, automatic gain control unit, power amplification unit, main control unit and power conversion unit form, multi-channel video signal inputs to multichannel and selects in switch unit, main control unit sends channel selecting instruction and controls multichannel and select switch unit to choose a wherein road vision signal to enter automatic gain control unit, the vision signal being selected regulates automatically through the automatic gain control unit amplitude of carrying out successively, after carrying out power amplification, exports as video output signals power amplification unit, power conversion unit is used to main control unit, multichannel is selected switch unit, automatic gain control unit and power amplification unit provide stable power supply.
2. a kind of unmanned plane multi-channel video switch according to claim 1, is characterized in that: described multichannel selects switch unit to adopt chip MAX4315.
3. a kind of unmanned plane multi-channel video switch according to claim 1, it is characterized in that: described automatic gain control unit is by filter circuit, amplifying circuit, separated detecting circuit and automatic gain amplifying circuit form, through multichannel, selecting vision signal that switch unit selects to enter amplifying circuit after circuit denoising after filtering amplifies, match circuit compares the normalized video standard signal of output by the vision signal after amplifying and the inner fiducial value arranging, the video standard signal of match circuit output is carried out to separation with separated detecting circuit and detection rectification makes it to become with the strong and weak direct-current control voltage changing of vision signal, the DC point of this direct-current control voltage control automatic gain amplifying circuit makes to change the gain of automatic gain amplifying circuit, thereby the output signal of automatic gain amplifying circuit feeds back to the stable output that filter circuit is realized automatic gain control unit.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104154997A (en) * | 2014-07-16 | 2014-11-19 | 北京空间机电研究所 | Unmanned aerial vehicle mounted light and small-sized self-stabilized flight multispectral imaging system |
| CN104580934A (en) * | 2015-01-09 | 2015-04-29 | 武汉理工大学 | Expansion method and device for multichannel video switchers |
| CN105100705A (en) * | 2015-06-17 | 2015-11-25 | 徐州工业职业技术学院 | System and method for controlling automatic switch of multi-channel video signals |
| CN105159175A (en) * | 2015-09-01 | 2015-12-16 | 江苏艾锐泰克无人飞行器科技有限公司 | Line concentration device of unmanned plane |
| CN108012148A (en) * | 2018-01-16 | 2018-05-08 | 吉林省广播电视研究所(吉林省新闻出版广电局科技信息中心) | Broadcast television audio quality real-time monitoring and the device and method to automatically switch |
| CN108183780A (en) * | 2017-12-28 | 2018-06-19 | 中航联创科技有限公司 | A kind of redundance Unmanned Aerial Vehicle Data Transmission system and transmission method |
| CN108600654A (en) * | 2018-04-28 | 2018-09-28 | 中国人民解放军92941部队 | Video broadcasting method and device |
| CN111246145A (en) * | 2020-03-10 | 2020-06-05 | 山东超越数控电子股份有限公司 | Multi-path display extension method based on single chip microcomputer |
| CN112532935A (en) * | 2020-11-23 | 2021-03-19 | 天津津航计算技术研究所 | Device for determining video source position based on SOC |
| CN115173884A (en) * | 2022-06-16 | 2022-10-11 | 中国船舶集团有限公司第七二三研究所 | Automatic gain control MISO radio frequency signal switch network |
| CN116973547A (en) * | 2023-07-31 | 2023-10-31 | 中国地质调查局地球物理调查中心 | Soil organic carbon, nitrogen and phosphorus monitoring system |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104154997B (en) * | 2014-07-16 | 2016-02-10 | 北京空间机电研究所 | A kind of UAV system small-sized self-stabilization aviation multi-optical spectrum imaging system |
| CN104154997A (en) * | 2014-07-16 | 2014-11-19 | 北京空间机电研究所 | Unmanned aerial vehicle mounted light and small-sized self-stabilized flight multispectral imaging system |
| CN104580934A (en) * | 2015-01-09 | 2015-04-29 | 武汉理工大学 | Expansion method and device for multichannel video switchers |
| CN104580934B (en) * | 2015-01-09 | 2017-12-08 | 武汉理工大学 | The extended method and device of multi-channel video switch |
| CN105100705B (en) * | 2015-06-17 | 2018-07-31 | 徐州工业职业技术学院 | A kind of multi-channel video signal automatic switching control system control method |
| CN105100705A (en) * | 2015-06-17 | 2015-11-25 | 徐州工业职业技术学院 | System and method for controlling automatic switch of multi-channel video signals |
| CN105159175A (en) * | 2015-09-01 | 2015-12-16 | 江苏艾锐泰克无人飞行器科技有限公司 | Line concentration device of unmanned plane |
| CN108183780A (en) * | 2017-12-28 | 2018-06-19 | 中航联创科技有限公司 | A kind of redundance Unmanned Aerial Vehicle Data Transmission system and transmission method |
| CN108183780B (en) * | 2017-12-28 | 2020-10-20 | 中航联创科技有限公司 | Redundancy unmanned aerial vehicle data transmission system and transmission method |
| CN108012148A (en) * | 2018-01-16 | 2018-05-08 | 吉林省广播电视研究所(吉林省新闻出版广电局科技信息中心) | Broadcast television audio quality real-time monitoring and the device and method to automatically switch |
| CN108012148B (en) * | 2018-01-16 | 2023-12-22 | 吉林省广播电视研究所(吉林省新闻出版广电局科技信息中心) | Device and method for monitoring and automatically switching audio quality of broadcast television in real time |
| CN108600654A (en) * | 2018-04-28 | 2018-09-28 | 中国人民解放军92941部队 | Video broadcasting method and device |
| CN111246145A (en) * | 2020-03-10 | 2020-06-05 | 山东超越数控电子股份有限公司 | Multi-path display extension method based on single chip microcomputer |
| CN112532935A (en) * | 2020-11-23 | 2021-03-19 | 天津津航计算技术研究所 | Device for determining video source position based on SOC |
| CN115173884A (en) * | 2022-06-16 | 2022-10-11 | 中国船舶集团有限公司第七二三研究所 | Automatic gain control MISO radio frequency signal switch network |
| CN116973547A (en) * | 2023-07-31 | 2023-10-31 | 中国地质调查局地球物理调查中心 | Soil organic carbon, nitrogen and phosphorus monitoring system |
| CN116973547B (en) * | 2023-07-31 | 2024-03-26 | 中国地质调查局地球物理调查中心 | Soil organic carbon, nitrogen and phosphorus monitoring system |
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