- Application scenario
Due to the flight control and microwave transmission of the UAV , there is only a limited transmission distance of less than 1km. For government surveillance applications that require remote real-time monitoring, this distance is not enough. Then, in addition to the standard short-distance microwave image transmission, the module of 4G infinite distance wireless image transmission can be added, and the real-time video of aerial photography can be transmitted to the monitoring center beyond the infinite distance in real time for the leader to remotely preview and command the eight parties. .
There are two solutions:
1) For low-altitude flight, no more than 100 meters high, 4G signal can also cover the range, the micro 4G picture transmission DVR module can be directly installed inside the drone body, connected to the drone camera, AV or HDMI can;
2) For applications with a flying height of more than 200 meters, the 4G picture transmission DVR module cannot be installed in the drone machine, but needs to be placed in the ground station. The ground output station receives the video output port after microwave reception, usually AV or HDMI, the video output of this output is connected to the UTV 4G image transmission DVR module, and the UAV video can be transmitted to the monitoring command center beyond the infinite distance for the leader's reference;
In addition, the device supports the operator's private network (APN or VPDN), uses a private network, completely disconnects from the public network, and wireless map transmission is more secure.
Product application picture:
Product specifications
The micro wireless close-packed secret transmission module mainly implements wireless transmission of audio and video streams and local video storage, as follows:
- Small size and ultra low power consumption;
- Support multiple video sources, support DV's standard definition AV output, and also support HDMI high-definition input, making video and back-transmission images clearer;
- Light carrying belt, the whole machine weighs 300 grams, can be connected to any battery, and has a long standby time, which can meet the time of one task;
- H.264 HP compression encoding is performed on the input video. Compared with the old MJPEG/MPEG4, the image is clearer and the code rate is lower, which is more suitable for network transmission;
- Support 3G/4G for wireless network image transmission, smooth transmission of D1 video, no distance limitation at all;
- Support G.726 voice codec, support audio and video synchronization transmission;
- Highly optimized narrowband wireless channel video streaming protocol with packet loss rate less than 2%, typical network delay of 1-3 seconds, no mosaic, smooth and smooth video;
- Provides large-scale network video back-end monitoring platform software SmartEyeTM, which can support multi-device access, multi-person preview video at the same time, support video, voice, positioning and playback.
Hardware description
Mini 4G HDMI DVR icon:
Equipment size: 61 (length) * 40 (width) * 14 (height) mm 
Ground station HDMI or AV output as a video source: 
System networking
The entire application system consists of “front-end 3G soldier image transmission device + back-end server software + client softwareâ€. The server software runs on the HP/IBM server and needs fixed-fiber optical network support. 
Security of the backend monitoring platform
Hefei's 3G image transmission equipment and back-end SmartEye platform system are highly secure, multi-level user name/password protection authentication mechanism, self-developed embedded system software, encrypted transmission method, etc., to ensure system security. Not infringed. Specifically embodied in the following aspects:
- (1) Wireless communication network mode: The audio and video acquisition equipment (signal acquisition terminal) of this platform adopts 3G network, and the client (such as mobile commander notebook display, handheld 3G intelligent terminal equipment of relevant personnel) adopts Ethernet network or 3G data network.
- Because 3G has better network coverage, larger network bandwidth, and GPS positioning function, it is more suitable for the network mode used when moving objects collect signals. The moving objects include people or vehicles, and collect mobile audio and video signals through 3G;
- (2) Network access security settings: device security access adopts “authentication modeâ€; viewing media source adopts “authentication or authorization modeâ€; background management adopts “authentication and rights management modeâ€; recording file adopts “encryption mode†Device access uses "authentication or authorization"; streaming server uses "self-secure mechanism."
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