Views:12 Author:Site Editor Publish Time: 2019-08-04 Origin:Site
If you are not a professional manufacturer of UAV video transmitters, you may not know what reception sensitivity is. In fact, when we talk about the reception sensitivity of UAV, we often talk about the sensitivity of UAV video transmitter, as video transmission is one of its most important functions.
Here is the content list:
1. What Is Rx Sensitivity of Drone Video Transmitter?
2. What Are Elements of Drone Video Transmitter Rx Sensitivity?
3. How to Improve Rx Sensitivity of Drone Video Transmitter?
Rx is the abbreviation of Receive. Long-range wireless video transmitter Rx defines the minimum signal strength that the wireless video transmitter can capture and still work properly. If the received power value in COFDM UAV video and data links equation is equal to or greater than the receiver sensitivity, then the receiver can work normally, that is to say, the wireless video transmitter can normally obtain the information contained in the transmitted signal. When the signal energy of the wireless video transmitter is less than the nominal receiving sensitivity, the receiver will not receive any data, that is to say, the receiving sensitivity is the minimum threshold for the COFDM UAV video and data links to receive the signal.
We should note that the reception sensitivity of wireless video transmitter has a great influence on transmission distance. Generally, when wireless video transmitter leaves the factory, its sensitivity has been adjusted to the best state according to relevant technical requirements. In the absence of professional instruments and technicians, the receiver sensitivity of wireless video transmitter must not be adjusted by ourselves.
There are three important components for the receiving sensitivity of UAV video transmitter.
At any temperature above absolute zero, carriers in long-range wireless video transmitter will be disturbed, which is the source of thermal noise. Thermal noise power is proportional to temperature, and it is random, so it does not change with frequency.
Thermal noise is one of the main sources of internal noise, so it is significant to reduce the noise figure by reducing the operating temperature of amplifiers, especially the main components of the drone video transmission system. For wireless video transmitter with high sensitivity, reducing noise temperature is an important measure.
The importance of noise depends on the extent to which it affects the operation of the target circuit.
In order to measure the noise characteristics of drone video transmission system, it is usually necessary to introduce a solution to measure the internal noise of wireless video transmitter solutions. With this measure, the noise performance of different circuits can be compared and measured accordingly. A widely used noise measure is called noise figure.
Narrowly speaking, it refers to the ratio of the output signal power of the amplifier to the noise power of the simultaneous output. It is often expressed in decibels. The higher the signal-to-noise ratio of the wireless video transmitter solutions, the less noise it produces. Generally speaking, the larger the signal-to-noise ratio, the smaller the noise mixed in the signal, the higher the sound quality of sound playback, the better wireless video transmitter is, otherwise the opposite. Signal-to-noise ratio should not be lower than 70 dB in general, and the signal-to-noise ratio of wireless video transmitter solutions should be more than 110 db.
In wireless video transmitter or other circuits, the internal noise of electronic components and devices plays an important role. Therefore, improving the noise performance of electronic components and devices and choosing low noise electronic components and devices can greatly reduce the noise figure of the wireless video transmitter.
According to the above discussion, the noise voltage is related to the bandwidth. As the bandwidth of the wireless video transmitter increases, the internal noise of the receiver or amplifier increases. Therefore, the bandwidth of the receiver or amplifier must be strictly selected so that it is not too narrow to satisfy the requirement of distortion in signal passing, and not too wide to avoid the decrease of signal-to-noise ratio.
A common emitter amplifier can be used to obtain the minimum noise factor of NF and the maximum power gain. At higher frequencies of wireless video transmitter, the optimum internal resistance is close to the input resistance of the common-based wireless video transmitter. Therefore, the common-base amplifier can be used to make the optimum internal resistance of wireless video transmitter equal to the input resistance, so that the minimum noise figure and the maximum power gain can be obtained simultaneously.
In short, reception sensitivity not only determines whether your wireless video transmitter has the best quality, it can even affect the safety of your UAV. If you want to have a highly sensitive UAV video transmitter, why not try our product? You will never regret cooperating with us.