[UAV's quick Knowledge] A medium to transmit high-altitude beauty - image transmission system
Updated: Nov 22, 2022
👁🗨| What is the image transmission system ?
The image transmission system is like the eyes of the drone, delivering beautiful scenery to the operator. Through the transmitter on the drone device, it can wirelessly transmits real-time video streaming to the remote control, and after the receiver on the remote control receiving the transmission signal of the drone, the monitor screen can present the picture taken by the drone.Civilian UAV transmission systems typically operate on frequencies of 2.4 GHz and 5.8 GHz. Different transmission devices may cause the different distance of transmission.
❌| Disadvantages of traditional point-to-point communication
Not only the image transmission system, but also in the control operation of UAVs, most of drones also use such a point-to-point transmission principle for control.
But the biggest disadvantage of this method is that it's easily limited by distance and terrain. Like an invisible connecting line, it has a certain length and can be stretched but not easy to bend. It can be used within a certain range, but if it exceeds this range, will couldn't be controlled. Because of the transmission rely on the point to point, if there is a large obstacle between the two, it may cause the connection to be interrupted, so that the drone can't return the picture successfully, and the remote control can't assign the drone to perform tasks. What is even worse is that for this communication structure, the disconnected drone will likely cause major harm and can't be recovered.
🌈| New communication technology solves the problems of traditional image transmission
In order to make drones more widely used in live, it is necessary to break through the shortcomings of point-to-point transmission. Therefore, as early as 2016, the UAVs' manufacturers try to convert the originally image transmission methods which is base on 2.4GHz and 5.8GHz into LTE image transmission, and used the new 4G mobile communication technology for image transmission and remote control signal reception.
The 4G communication system is attached to the mobile phone communication base station. In addition to the high coverage rate of the base station, its reception stability is also guaranteed by the telecommunications industry. In addition, the signal can be received everywhere, even if the Interference and disconnection of the UAV can immediately resume communication and operate normally. As long as it is able to receive signals, no matter how far the distance is, drones can carry out flight missions, and can even carry out detours of buildings and bridge inspections, which greatly reduces the risk of human inspections in the past and improves the efficiency of its survey.
❌|Disadvantages of new transmission methods
Using the transmission method with 4G LTE will cause different delays due to different technical applications and different devices when the images captured by the drone are sent back to the tablet. Making the operator unable to grasp the flight status of the UAV will lead to the failure of the mission, and may even lead to a crash. For example: the operator looks at the video and thinks that there is still some distance between the drone and the obstacle, but in fact the drone may have hit it.
Generally, when FB, YouTube uses 4G for live webcasting, the delay between the screen and the actual interaction is about 13-19 seconds. In 2018, DJI discussion forum was pointed out that the drone on market with 4G image transmission delay was about 3-15 seconds.
At present, the exclusive 4G LTE image transmission technology of avilon intelligence can control the delay of video streaming within 0.5 seconds. The operator can easily dispatch the drone regardless of the operating distance even if at a remote location, and can be used with a tablet for automated operation. With the advent of the 5G era, 5G provides drones with higher bandwidth and transmits clear 4K high-quality real-time flight images with extremely low latency. There are also some of the practitioner watch the opportunity of immersive real-time image transmission, try to combine real-time video streaming with MR technology to create competitive drone events.
✨|avilon intelligence's exclusive 4G/5G image transmission technology
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