UAV mapping pathway, bandwidth, power overview

The widespread use of drones for wireless image transmission has brought great convenience to aerial photography, rescue and monitoring. In the course of these applications, there is also an increasing awareness of the distance of graphical transmission. Under normal circumstances, with enough bandwidth, raising the power will be able to transmit farther, but the physical damage to workers exposed to high-power transmitting equipment is significant. To solve this drone map transmission far and less harmful to the human body, we need to know enough about its transmission path, power, bandwidth.

Drone values for power inspection

1. Approach

There are many options for drone mapping to achieve ultra long range, either wired or wireless. In general, it must be the case that cable transmission is more distant, and tens of thousands of kilometers are possible. In the case of voice transmission, face-to-face conversations are transmitted by acoustic waves, which, although short in distance, are possible without the use of high-tech means (such as the “paper cup phone” that we learned in school). The images have to be communicated through modern means, such as fiber optics.

UAV mapping equipment

The frequency of electromagnetic waves When it comes to modern means of communication, we have to talk about the frequency of electromagnetic waves, which, in general, propagates farther and farther away as the lower the frequency. For example, the transmission of secure communications telephones, which are required for military activities, are ultra-short-wave frequencies, which are more distant and are generally used for ground communications (walkie-talkies, etc.). Some communication methods that need to be relayed (via repeater towers, etc.) use shortwave, which is lower than ultrashort wave frequency and can be spread farther, hundreds of kilometers or thousands of kilometers, for example, VOA radio uses shortwave frequency.

2、Power

Long-distance transmission is certainly a matter of the narrower the amount of data propagated, the greater the transmit power and the higher the sensitivity, and thus the power involved. For ultra long range launch information, the higher the power the farther you launch. TV towers like those erected on high places are several kilowatts or even tens of thousands of watts. To give a simple example, after a broadcast is transmitted through a tower, a large area can receive the broadcast, which is certainly not a small power, and the physical damage to television workers if exposed to the transmitting equipment is very high.

3. Bandwidth

The bandwidth of voice is generally around 3K, because ordinary people speak 3K is enough, if it can be compressed a few hundred K is enough, so the transmission bandwidth of voice is very small. And now that drones are starting with M in bandwidth, the challenge is much greater for long-distance transmission. The transmission distance depends on the sensitivity, according to the Shannon formula, if the bandwidth increases ten times, the sensitivity decreases ten times, so the bandwidth is precious for wireless transmission.

A full understanding of the pathway, bandwidth, power is the prerequisite to solve the requirements of UAVs to map long-distance transmission, high quality, low power, and strong anti-interference capability. [CVW]

Translated with www.DeepL.com/Translator (free version)