CN201577153U - High-definition video capturing and processing system in underground all-black environment - Google Patents
High-definition video capturing and processing system in underground all-black environment Download PDFInfo
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- CN201577153U CN201577153U CN2009202455311U CN200920245531U CN201577153U CN 201577153 U CN201577153 U CN 201577153U CN 2009202455311 U CN2009202455311 U CN 2009202455311U CN 200920245531 U CN200920245531 U CN 200920245531U CN 201577153 U CN201577153 U CN 201577153U
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Abstract
The utility model discloses a high-definition video capturing and processing system in an underground all-black environment, which comprises an external housing and a circuit board mounted in the external housing; a power supply unit, a microprocessor, a video capturing and processing unit, a voice processing unit, a display unit, a storage unit, a wireless transceiving unit and a USB interface are arranged on the circuit board, wherein the video capturing and processing unit, the voice processing unit, the display unit, the storage unit, the wireless transceiving unit and the USB interface are connected with the microprocessor respectively; the microprocessor is connected with a PC computer through the USB interface; the components are connected for constituting a mobile terminal device for capturing audio and video signals and carrying out wireless transceiving, playback and serial output on the captured audio and video signals; and the video capturing and processing unit comprises an optical lens, a low-light-level image intensifier, a CMOS image sensor and a white light secondary light source. The high-definition video capturing and processing system has the advantages of simple structure, small volume, flexible networking, easy movement, low cost and low power consumption, and can realize the high-definition video capturing and processing in the underground all-black environment, and realize the real-time low-power-consumption mobile voice communication function.
Description
Technical field
The utility model belongs to mine wireless monitor and wireless mine rescue technical field, especially relates to high definition video collecting and processing system under the total darkness environment of a kind of down-hole.
Background technology
At present, in the monitoring field, mine, be extensive use of mining low-light (level) high definition video camera, and what existing video acquisition processing unit all adopted is the combination technique scheme of ccd sensor+dsp controller, in the actual use, it matches by taking different ccd sensors and dsp controller, has realized different imaging effects, is equipped with wired modes such as optical fiber simultaneously the signal that collects is transmitted.Thereby, all there is following limitation mostly in existing video acquisition processing unit: power consumption is big, carry inconvenience, there is not voice communication, and most video cameras can not be to work under the 0Lx illumination under total darkness environment, even if can reach the product of 0Lx illumination also is to be furnished with infrared auxiliary lighting apparatus, thereby has further increased power consumption; Simultaneously, existing video acquisition processing unit is only applicable to monitoring field, mine, and is not suitable in the mine rescue process.And the rescue aid volume that uses in the mine rescue is big, weight greatly and adopt wired mode to transmit more, carry inconvenience.To sum up, colliery outfit watch-dog and rescue aid expense generally all compare expensive.
Do not adopt the mining hand-held terminal device of low-light level night vision device+arm processor in the market.The arm processor processing capacity is powerful, and processing speed is fast, and peripheral hardware is abundanter on the sheet, and interface is varied, is suitable for various embedded systems; And existing dsp controller relatively and the ARM controller, and power consumption is bigger, and peripheral hardware is limited on the sheet, and the peripheral circuit relative complex has restricted the area of circuit board.
The utility model content
Technical problem to be solved in the utility model is at above-mentioned deficiency of the prior art, high definition video collecting and processing system under the total darkness environment of a kind of down-hole is provided, its device therefor is simple in structure, volume is little, networking flexibility, move light, cost is low and low in energy consumption, can realize under the total darkness environment of down-hole high sharpness video acquisition process and low-power consumption moving speech communication function in real time.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: high definition video collecting and processing system under the total darkness environment of a kind of down-hole, it is characterized in that: comprise external shell and the circuit board that is installed in described external shell inside, described circuit board is provided with and is the power supply unit of each power unit power supply, microprocessor and video acquisition and processing unit, Audio Processing Unit, display unit, memory cell, wireless transmit/receive units and the USB interface of joining with microprocessor respectively, and described microprocessor joins by USB interface and PC; Described microprocessor, video acquisition and processing unit, Audio Processing Unit, display unit, memory cell, wireless transmit/receive units and USB interface connect to form a mobile terminal device that the Voice ﹠ Video signal is gathered and collection Voice ﹠ Video signal carried out wireless receiving and dispatching, playback and serial output; The gleam image intensifier that described video acquisition and processing unit comprise optical lens, join with optical lens, join with gleam image intensifier and light signal can be converted to the cmos image sensor of the signal of telecommunication and be arranged on the white light secondary light source of optical lens week side, described cmos image sensor and microprocessor join.
Described external shell is the hand-hold type housing.
Described microprocessor is chip S3C6410.
Described cmos image sensor is chip MT9D111.
Described wireless transmit/receive units is the WiFi wireless communication module.
Described Audio Processing Unit is audio encoding and decoding chip UDA1341TS.
Described gleam image intensifier joins by C interface or CS interface and optical lens, and gleam image intensifier is coupling on the cmos image sensor by the light cone direct coupling system.
Described power supply unit comprises intrinsic safety electric source and the PMIC chip that joins with described intrinsic safety electric source respectively, LD0 chip and efficient DC-DC chip, and described intrinsic safety electric source comprises supplying cell, the DC-DC change-over circuit that joins with described supplying cell and the intrinsically safe circuit that joins with described DC-DC change-over circuit.
The utility model compared with prior art has the following advantages:
1, design concept novelty adopts the CMOS+ARM11 scheme, is equipped with 128MB Mobile DDR SDRAM, 128MB NAND Flash, does not have the end product based on this scheme in the market.
2, cost is low, low in energy consumption, volume is little and light weight, and S3C6410 is based on low cost, low-power consumption, the high-performance microprocessor solution of ARM1176JZF-S kernel, adopts 90nmCOMS technology.Inside is integrated a plurality of powerful hardware accelerators, integrated multi-format codec (MFC) support MPEG4/H.263, H.264 encoding and decoding and VC1 decoding.Simultaneously integrated many hardware adaptor generate PLL as system managements such as Camera interface, TFT-24bit true color lcd controller, power supply, 4 passage UART, 32 passage DMA, 4 passage timers, general purpose I/O port, IIS, iic bus interface, USB Host, USBOTG, 3 passage SD/MMC Host controllers and clock.Disposal ability is strong, Peripheral Interface is abundant, has simplified the design of circuit board, makes based on end product of the present utility model and realizes the small size design.
3, result of use is good, video image is clear, low visibility reaches 0Lx: the front end video acquisition unit is a cover low-light video-unit, its with 18mm surpass two generation gleam image intensifier by light cone coupling directly to cmos camera, the image intensifier input is connected with optical lens by C or CS interface, be furnished with the white light floor light simultaneously, and make this apparatus integration.Display unit is the TFT-LCD display of 3.5 inch 640 * 480 resolution, adopts the built-in H.264 codec of S3C6410 that image is carried out encoding and decoding, and picture quality reaches the D1 quality.
4, WiFi wireless transmission, rapid networking is flexible, use is easy and simple to handle: the WiFi module of employing is based on the 802.11b/g agreement, the data transmission rate of supporting based on video acquisition processing terminal equipment of the present utility model can realize multi-multipoint quickly networking up to 54Mbps.
5, intrinsically safe circuit design: the utility model adopts the intrinsic safety electric source power supply; its circuit design meets intrinsic safety standard GB3836.1, GB3836.4 requirement; design has overvoltage, overcurrent, anti-reverse protective circuit in the circuit; the design of one key switch machine is arranged, increased useful life based on handheld terminal of the present utility model.
6, of many uses, easy to carry: little based on end product volume of the present utility model, and adopt the WiFi wireless transmission, and do not need to rely on media such as pipeline, cable, easy to carry.Not only can realize down-hole HD video monitoring but also can realize the real-time speech communicating function, both be applicable to monitoring field, mine, be applicable to the mine rescue field again, save the outfit cost in colliery greatly.
Very convenient when 7, reality is used, the user only need adopt a hand-held communication terminal to realize high sharpness video acquisition process and real-time speech communicating under the total darkness environment of down-hole as video camera.
In sum, the utility model device therefor is simple in structure, volume is little, networking flexibility, move light, cost is low and low in energy consumption, can realize under the total darkness environment of down-hole high sharpness video acquisition process and low-power consumption moving speech communication function in real time.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Description of drawings
Fig. 1 is a circuit block diagram of the present utility model.
Fig. 2 utilizes the utility model to carry out the method flow diagram that high definition video collecting is handled under the total darkness environment of down-hole.
Description of reference numerals:
The 1-power supply unit; The 2-microprocessor; 3-video acquisition and processing unit;
The 3-11-optical lens; The 3-2-gleam image intensifier; 3-3-white light secondary light source;
The 3-4-image processing circuit; The 4-Audio Processing Unit; The 5-display unit;
The 6-memory cell; The 7-wireless transmit/receive units.
Embodiment
As shown in Figure 1, high definition video collecting and processing system under the total darkness environment of down-hole described in the utility model comprises external shell and the circuit board that is installed in described external shell inside; Described circuit board is provided with and is the power supply unit 1 of each power unit power supply, microprocessor 2 and video acquisition and processing unit 3, Audio Processing Unit 4, display unit 5, memory cell 6, wireless transmit/receive units 7 and the USB interface 8 of joining with microprocessor 2 respectively, and described microprocessor 2 joins by USB interface 8 and PC 9.Described microprocessor 2, video acquisition and processing unit 3, Audio Processing Unit 4, display unit 5, memory cell 6, wireless transmit/receive units 7 and USB interface 8 connect to form a mobile terminal device that the Voice ﹠ Video signal is gathered and collection Voice ﹠ Video signal carried out wireless receiving and dispatching, playback and serial output.The gleam image intensifier 3-2 that described video acquisition and processing unit 3 comprise optical lens 3-11, join with optical lens 3-11, join with gleam image intensifier 3-2 and light signal can be converted to the cmos image sensor 3-4 of the signal of telecommunication and be arranged on the white light secondary light source 3-3 of optical lens 3-11 week side, described cmos image sensor 3-4 and microprocessor 2 join.
In the present embodiment, described external shell is the hand-hold type housing.Described microprocessor 2 is chip S3C6410, and described chip S3C6410 is specially chip S3C6410XH-66, and promptly dominant frequency is 667MHz.。Described wireless transmit/receive units 7 is the WiFi wireless communication module.Described gleam image intensifier 3-2 joins by C interface or CS interface and optical lens 3-11, and gleam image intensifier 3-2 is coupling on the cmos image sensor 3-4 by the light cone direct coupling system.That is to say, video acquisition unit in video acquisition and the processing unit 3 is a cover low-light video-unit, it is directly coupled to gleam image intensifier 3-2 (specifically be surpass two generation gleam image intensifier) on the cmos image sensor 3-4 by the light cone coupling, and whole device is integrated, and is furnished with white light secondary light source 3-3 simultaneously and carries out floor light.The camera visual range of cmos camera reaches 10 meters, and minimal illumination can reach 0Lx, and wherein the CMOS chip in the cmos camera is chip MT9D111.Described display unit 5 is the TFT-LCD display of 3.5 inch 640 * 480 resolution, and memory cell 6 is the TF card of 4G capacity.Described WiFi wireless communication module is the wireless WiFi module WM-G-MR-09 based on the 802.11b/g standard, and its peak transfer rate can reach 54Mbps.Described Audio Processing Unit 4 is audio encoding and decoding chip UDA1341TS.
Described power supply unit 1 comprises intrinsic safety electric source and the PMIC chip that joins with described intrinsic safety electric source respectively, LD0 chip and efficient DC-DC chip, and described intrinsic safety electric source comprises supplying cell, the DC-DC change-over circuit that joins with described supplying cell and the intrinsically safe circuit that joins with described DC-DC change-over circuit.Described intrinsic safety electric source converts the 4V-17V voltage of input to 5V voltage by efficient DC-DC change-over circuit, give each power unit power supply respectively after by PMIC chip, LD0 chip and efficient DC-DC chip the 5V voltage transitions being become 3.3V, 3V, 2.8V, 1.8V and 1.2V plurality of voltages again, and the circuit design of intrinsic safety electric source meets intrinsic safety standard GB3836.1 and GB3836.4 requirement.Described DC-DC change-over circuit and efficient DC-DC chip are chip TPS62112, and described PMIC chip is chip TPS650243.In the present embodiment, described power supply is external 12V lithium iron phosphate storage battery power supply.
As shown in Figure 2, utilize the utility model to carry out the process that high definition video collecting is handled under the total darkness environment of down-hole, may further comprise the steps:
The Voice ﹠ Video signal that step 2,2 pairs of microprocessors receive carries out wireless receiving and dispatching, playback and serial output:
When need carry out wireless transmission to video acquisition and processing unit 3 and the Audio Processing Unit 4 Voice ﹠ Video signal of gathering, the Voice ﹠ Video signal that 2 pairs of microprocessors receive carries out encoding compression, time-sequencing successively, stores and be packaged into the packet that is fit to wireless network transmissions, and 5 pairs of vision signals that receive of microprocessor 2 control display units show synchronously simultaneously; Need are sent after the packet of the suitable wireless network transmissions of information package one-tenth, microprocessor 27 pairs of control wireless transmit/receive units need to send and reach receiving terminal by wireless network after packet is modulated.At this moment, video acquisition and processing unit 3, Audio Processing Unit 4, microprocessor 2, display unit 5, memory cell 6 and wireless transmit/receive units 7 connect to form the signal launching circuit of described mobile terminal device.
In the present embodiment, the Voice ﹠ Video signal that 2 pairs of microprocessors receive carries out encoding compression, time-sequencing successively, stores and be packaged into the packet that is fit to the WiFi wireless network transmissions, and 5 pairs of vision signals that receive of microprocessor 2 control display units show synchronously simultaneously; Need are sent after the packet of the suitable WiFi wireless network transmissions of information package one-tenth, 7 pairs of microprocessor 2 control wireless transmit/receive units need to send packet and modulate the back and reach receiving terminal by the WiFi wireless network, specifically are to send and reach receiving terminal by the WiFi wireless network by the WiFi route.
When Voice ﹠ Video signal that the need receiving end/sending end is sent, microprocessor 2 control wireless transmit/receive units 7 are received from the Voice ﹠ Video signal data bag that transmitting terminal sends, and are undertaken delivering to microprocessor 2 after the demodulation by 7 pairs of packets that received of wireless transmit/receive units; Microprocessor 2 corresponding successively to unpack through the packet after the demodulation, after storage, time-sequencing and the decompression, the audio signal that obtains after handling is reached Audio Processing Unit 4 carry out D/A conversion and filtering and be reduced into voice analog signal, the vision signal that will obtain after will handling simultaneously reaches display unit 5 and shows synchronously.At this moment, described wireless transmit/receive units 7, microprocessor 2, Audio Processing Unit 4, display unit 5 and memory cell 6 connect to form the signal receiving circuit of described mobile terminal device.
When need carry out playback to being stored in Voice ﹠ Video packed data in the memory cell 6, after video of being stored in 2 pairs of memory cell 6 of microprocessor and audio compression data carry out time-sequencing and decompression, the audio signal that processing is obtained reaches Audio Processing Unit 4 and carries out D/A conversion and filtering and be reduced into voice analog signal, the vision signal that will obtain after will handling simultaneously reaches display unit 5 and shows synchronously, thus the playback of the data of realization.At this moment, described memory cell 6, microprocessor 2, Audio Processing Unit 4 and display unit 5 connect to form the signal playback loop of described mobile terminal device.
When need were externally exported being stored in Voice ﹠ Video packed data in the memory cell 6, microprocessor 2 directly was transferred to video and the audio compression data of being stored in the memory cell 6 on the PC 9 by described USB interface 8.At this moment, described memory cell 6, microprocessor 2 and USB interface 8 connect to form the wired mode output loop of signal of described mobile terminal device.
During practical operation, the course of work of mobile communication terminal described in the utility model is: after the intrinsic safety electric source power supply, at first signalling (being transmitting terminal) by video acquisition and processing unit 3 be the low-light video-unit to vision signal gather, after enhancement process and the A/D conversion, the DID after will strengthening is again delivered to microprocessor 2 and is handled by the H.264 codec that microprocessor 2 carries; Simultaneously, Audio Processing Unit 4 voice analog signal that to be transmitter send need is sampled and is quantized, and simultaneously the data after will quantizing is delivered to microprocessor 2 and handles; After described microprocessor 2 receives the audio digital signals that DID that video acquisition and processing unit 3 send and Audio Processing Unit 4 send, compress successively respectively, time-sequencing, storage and packing and demonstration.Because speech data after compression can't transmit in the WiFi wireless network, because the transmission delay of WiFi wireless network has uncertainty, it is not a slot transmission, but the bag transmission; Thereby microprocessor 2 must rationally be packed according to the size of actual data packet before transfer of data; Before the packing, need the data format in each bag is improved; Afterwards, the packet that microprocessor 2 obtains processing again reaches wireless transmit/receive units 7, because wireless transmit/receive units 7 supports data transmission rate up to 54Mbps, thereby can realize quickly networking.
H.264 described microprocessor 2 adopts, and codec carries out H.264 form compression to video signal, H.264 the advantage of code/decode format maximum is to have very high data compression ratio, under the condition of equal picture quality, H.264 the compression ratio of code/decode format is more than 2 times of MPEG-2, be 1.5～2 times of MPEG-4, save the transmission time of video image greatly.In addition, H.264 code/decode format also has the image of high-quality smoothness when having high compression ratio.Described microprocessor 2 is before compressing voice signal, and speech data transmits with 64Kbps speed, and after the speech data that is transmitted by microprocessor 2 carried out encoding compression, becoming transmission rate was the voice signal of 8Kbps.
Receiving side signal (being receiving terminal) by wireless transmit/receive units 7 be received from signal that transmitting terminal sends be packet and carry out corresponding demodulation after, deliver to microprocessor 2 and handle; After microprocessor 2 is received packet, earlier temporarily be stored in the buffering area packet, general buffering area inside can hold the data of a lot of bags, unpack again, according to packet sequence number, rearrange data then, so just can finish the needs of transmitting real-time data in the network, thereby the utility model is to finish the real-time Transmission of speech data by sacrificing buffering area and a bit of delay time, then with storage in memory cell 6.Simultaneously,, need carry out decompress(ion), finish the recovery of image and speech data because the data of receiving are image and speech data form after the compression.To sum up, microprocessor 2 with the packet that is received unpack successively, store, behind time-sequencing and storage, decompress(ion), again described data image signal being reached display unit 5 shows, simultaneously audio digital signals is reached Audio Processing Unit 4, by Audio Processing Unit 4 with importing into data by D/A conversion and filtering after, be reduced into voice analog signal and give the user, so just finished the whole transmission course of high-definition image and voice by receiver.
During signal playback, microprocessor 2 with image and voice data decompression in the memory cell 6 after, deliver to display unit 5 respectively and Audio Processing Unit 4 is handled.Because the image of storage and speech data all are through the data behind the compressed encoding in the memory cell 6, thereby need behind microprocessor 2 decompress(ion)s, again data image signal be reached display unit 5 and show, simultaneously audio digital signals is reached Audio Processing Unit 4 by D/A conversion and filtering after, be reduced into voice analog signal and give the user by receiver.
Signal data when output, can directly export by wired mode, microprocessor 2 with the image in the memory cell 7 and voice data decompression after USB interface 8 directly output on the PC 9.
In sum, because image and voice signal are the continuous signals of telecommunication, at transmitting terminal, under the total darkness environment of down-hole, video acquisition and processing unit 3 are under the illuminating effect of white light secondary light source 3-3, transfer the very faint analog picture signal that collects to digital quantity after through figure image intensifying and A/D conversion, simultaneously analog voice signal carry out the A/D sampling by Audio Processing Unit 4 and quantize after be transformed into digital quantity; And, with the data image signal that obtains after handling compress with time-sequencing after deliver to display unit 5 and carry out image and show, and in memory cell 6, store.In addition, because image and voice signal data have the big characteristics of succession, real-time and data volume, thereby it can't transmit in the WiFi wireless network, before transmission, must compress earlier and sort, store again and pack (meeting the WiFi data packets for transmission), transmit in the WiFi network by modulation and WiFi route then.Correspondingly, when receiving terminal receives data, carry out demodulation earlier, unpack and store again and sort again and decompress(ion),, undertaken being reduced into voice analog signal after D/A conversion and the filtering by Audio Processing Unit 4 at last again by display unit 5 display images.
The above; it only is preferred embodiment of the present utility model; be not that the utility model is imposed any restrictions; everyly any simple modification that above embodiment did, change and equivalent structure are changed, all still belong in the protection range of technical solutions of the utility model according to the utility model technical spirit.
Claims (8)
1. high definition video collecting and processing system under the down-hole total darkness environment, it is characterized in that: comprise external shell and the circuit board that is installed in described external shell inside, described circuit board is provided with and is the power supply unit (1) of each power unit power supply, microprocessor (2) and video acquisition and processing unit (3), Audio Processing Unit (4), display unit (5), memory cell (6), wireless transmit/receive units (7) and the USB interface (8) of joining with microprocessor (2) respectively, and described microprocessor (2) joins by USB interface (8) and PC (9); Described microprocessor (2), video acquisition and processing unit (3), Audio Processing Unit (4), display unit (5), memory cell (6), wireless transmit/receive units (7) and USB interface (8) connect to form a mobile terminal device that the Voice ﹠ Video signal is gathered and collection Voice ﹠ Video signal carried out wireless receiving and dispatching, playback and serial output; The gleam image intensifier (3-2) that described video acquisition and processing unit (3) comprise optical lens (3-11), join with optical lens (3-11), join with gleam image intensifier (3-2) and light signal can be converted to the cmos image sensor (3-4) of the signal of telecommunication and be arranged on the white light secondary light source (3-3) of all sides of optical lens (3-11), described cmos image sensor (3-4) and microprocessor (2) join.
2. according to high definition video collecting and processing system under the total darkness environment of the described down-hole of claim 1, it is characterized in that: described external shell is the hand-hold type housing.
3. according to high definition video collecting and processing system under claim 1 or the 2 described down-hole total darkness environments, it is characterized in that: described microprocessor (2) is chip S3C6410.
4. according to high definition video collecting and processing system under claim 1 or the 2 described down-hole total darkness environments, it is characterized in that: described cmos image sensor (3-4) is chip MT9D111.
5. according to high definition video collecting and processing system under claim 1 or the 2 described down-hole total darkness environments, it is characterized in that: described wireless transmit/receive units (7) is the WiFi wireless communication module.
6. according to high definition video collecting and processing system under the total darkness environment of the described down-hole of claim 3, it is characterized in that: described Audio Processing Unit (4) is audio encoding and decoding chip UDA1341TS.
7. according to high definition video collecting and processing system under claim 1 or the 2 described down-hole total darkness environments, it is characterized in that: described gleam image intensifier (3-2) joins by C interface or CS interface and optical lens (3-11), and gleam image intensifier (3-2) is coupling on the cmos image sensor (3-4) by the light cone direct coupling system.
8. according to high definition video collecting and processing system under claim 1 or the 2 described down-hole total darkness environments, it is characterized in that: described power supply unit (1) comprises intrinsic safety electric source and the PMIC chip that joins with described intrinsic safety electric source respectively, LDO chip and efficient DC-DC chip, and described intrinsic safety electric source comprises supplying cell, the DC-DC change-over circuit that joins with described supplying cell and the intrinsically safe circuit that joins with described DC-DC change-over circuit.
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| CN2009202455311U CN201577153U (en) | 2009-12-01 | 2009-12-01 | High-definition video capturing and processing system in underground all-black environment |
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| CN2009202455311U CN201577153U (en) | 2009-12-01 | 2009-12-01 | High-definition video capturing and processing system in underground all-black environment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104320614A (en) * | 2014-10-14 | 2015-01-28 | 中国西电电气股份有限公司 | Interior video monitoring system and method of GIS (Geographic Information System) device |
| CN109413304A (en) * | 2017-08-18 | 2019-03-01 | 深圳市星航洋科技有限公司 | A kind of carry-on safety equipment of wireless internet of things |
-
2009
- 2009-12-01 CN CN2009202455311U patent/CN201577153U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104320614A (en) * | 2014-10-14 | 2015-01-28 | 中国西电电气股份有限公司 | Interior video monitoring system and method of GIS (Geographic Information System) device |
| CN104320614B (en) * | 2014-10-14 | 2018-10-02 | 中国西电电气股份有限公司 | A kind of GIS device interior video monitoring system and method |
| US10666907B2 (en) | 2014-10-14 | 2020-05-26 | China Xd Electric Co., Ltd. | Internal video monitoring system and method for GIS device |
| CN109413304A (en) * | 2017-08-18 | 2019-03-01 | 深圳市星航洋科技有限公司 | A kind of carry-on safety equipment of wireless internet of things |
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Granted publication date: 20100908 Termination date: 20101201 |