Analysis of the "optical nerve" image transmission system of drone

Preconceived, we start from the drone simulation map, we first throw out some of the paradox concepts of drones:

Analog communication system model

Analog image transmission refers to the process of performing source and channel processing on analog image signals whose time (including space) and amplitude are continuously changed, by analog channel transmission or by analog recording means. Generally, the image baseband signal is obtained by using a source processing method such as scanning and picking up image information and a compression frequency band, and then an image passband signal is formed by a channel processing method such as pre-equalization and modulation.

Digital communication system model

Image digital transmission refers to the process of digitizing the map signal through source coding and channel coding, transmission through digital channels (cable, microwave, satellite, fiber, etc.) or through digital storage and recording devices. The biggest feature of digital signals in transmission is that it can be recovered multiple times without degrading quality. It also has other features superior to analog transmission, such as easy processing, flexible scheduling, high quality, high reliability, and convenient maintenance.

So in contrast, the oral expression can contain more detailed information, and the practicality also has a relatively large advantage, and the required resources are relatively small, but we have a saying that "good memory is not as bad as a bad pen", the spoken language is difficult to complete. Restore, but also difficult to remember, so it is more practical to convert the spoken language into words in as much detail as possible.

Similarly, the analog image transmission and the digital image transmission have a similar relationship:

one. Hardware and circuit

Simulation diagram transmission: Due to the sensitivity to hardware and routing, products made by different manufacturers using the same scheme will have great differences, and due to the antenna technology, the quality of the market simulation maps varies widely.

Digital image transmission: digitizing the analog signal, improving the fault tolerance of the circuit itself, has unique advantages in stability and reliability, and for this reason, the sensitivity of the digital image transmission to the hardware circuit itself is greatly reduced.

two. Transmission signal

Analog image transmission: Since the noise is superimposed on the useful information, it is difficult to distinguish the noise and the useful information. While removing the noise, the useful information may also be removed; similarly, the analog image transmission cannot be Simply amplify the power to achieve the purpose of increasing the transmission distance.

Digital image transmission: noise does not affect the transmission of information itself. Most of the noise can be filtered out by software, which can eliminate noise accumulation. The reliability of information transmission is ensured by different verification techniques in the later stage. In addition, digital information is also convenient for encryption and information. The confidentiality is greatly enhanced.

three. Ease of use

Analog image transmission: The recorded information is the information itself, which may be affected by the external environment such as recording accuracy.

Digital image transmission: The image signal itself is a digital signal, which is easy to record. It is also convenient for connecting various digital interfaces. The signal can be processed by modern computing technology.

However, limited to the current technology, digital image transmission technology still has bottlenecks; for example, digital image transmission processing technology has high requirements on processor resources, and it is easy to cause MUC card death, frame loss, etc. in the case of severe signal interference; In the case of resolution, the number of frames is low. At the same time, digital image transmission still faces the problems of high technical complexity, low frequency band utilization and high synchronization requirements. However, with the development of drone technology, these problems will be slowly solved. In general, digital maps Transmission technology is the general direction of the future development of image transmission technology.

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