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Analysis of EMI electromagnetic interference in civil UAV Based on View Details

Author:admin   AddTime:2020-08-22

In recent years, UAV technology has developed rapidly, and the technology has been constantly broken through and innovated, and more and more UAV products have been produced. In addition to the military field, it has been widely used in civil fields, such as personal entertainment, police security, logistics express, aerial photography, industry inspection, agricultural value preservation, remote sensing surveying and mapping, emergency rescue and so on, which has made great contributions to people's work efficiency and China's economy.

The rise of civil UAV has both advantages and disadvantages. The threshold of UAV entry is getting lower and lower, and the "black flying" of UAV is becoming more and more serious. It is often reported in the news that the unauthorized entry of UAV into the airspace of passenger aircraft leads to the loss of GPS signal of airliner flight, and the entry of UAV into airport leads to flight delay or even cancellation. If the lawless elements use these loopholes to maliciously invade, the consequences will be unimaginable. As a result, a series of anti UAV products emerge as the times require. The anti UAV jamming technology is to apply electromagnetic interference to UAV Communication, navigation, radar and other systems, so that the UAV performance is reduced or invalid. At the same time, this technology plays an important role in anti black flying, and at the same time, it will injure some legal flying UAVs. The development of UAV is very challenging, and the problem of electromagnetic interference needs to be solved.

Recently, in addition to the huge domestic market, UAVs are mainly exported to developed countries in Europe and the United States. The whole UAV must pass the EMC certification to obtain the market access qualification. If the EMI electromagnetic interference exceeds the standard, the product can not pass the EMC certification, so it can not obtain the export qualification. At the same time, the excessive EMI electromagnetic interference will also affect the signal quality of wireless transmission and the power of UAV system The defects of EMC design directly affect the stability of the whole machine.

From the current situation, the main EMI electromagnetic interference problems of UAV include the following:

1. EMI problems of circuit board components

2. EMI problem of aerial camera head

3. EMI problems caused by motor engine

4. Radiation EMI problems caused by power supply



The reliable and fast EMI electromagnetic interference solution is to use the special absorbing material for UAV. Through the frequency characteristics of UAV EMI, a wide screen band absorbing material sheet is developed. By sticking it to the radiation part, the EMI radiation wave can be well absorbed, and the EMC problem of UAV electromagnetic compatibility can be solved.

For example:

1. Sticking special absorbing material on the camera can effectively restrain the exceeding of the fundamental frequency and double frequency of MCLK and PCLK.

2. Use a wave absorber near the motor to isolate and prevent radiation.

3. The crosstalk between plates is isolated by absorbing material.

Absorbing materials




The picture shows that the radiation of UAV reaches the standard after being attached with wave absorbing plate

Absorbing materials

It is proved that the electromagnetic radiation interference can be effectively reduced by using absorbing materials on UAV. For example, Cao Fei, the founder and CEO of AVIC, which focuses on the development of UAVs for power line inspection, once said that they would add shielding devices made of absorbing materials to the important components of UAVs, or directly use anti electromagnetic interference components to make UAVs. It shows that the absorbing and shielding materials play an important role in the development and function improvement of UAV.

Here, the editor also reminds us to abide by relevant laws and regulations when using UAVs, especially not to interfere with the flight safety of airliners. In addition, when using UAVs in the permitted flight areas, they should also pay attention to the flight height not exceeding the specified flight height, and the flight speed should not be too fast. The UAV with obstacle avoidance function should turn on the obstacle avoidance function when flying, and try to keep away from crowded places Fang.

Absorbing material: www.goodsmaterial.com

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