Ming Min Yi Ge from Ou Fei Temple
Qubits | Official account QbitAI
Unexpectedly, the phased array radar used on aircraft carrier warships is now used to prevent wild boars???
It can also be used with DJI drones.
As soon as the radar spotted the wild boar, the drone drove away. Coverage ranges from a radius of 5 km to 10 km and can monitor 100 targets simultaneously.
And as long as the radar is 15kg, a single person can carry it away.
Good guys, prevent a wild boar from putting together the keywords "mini", "mobile", "phased array", "bee swarm".
Netizens couldn't help but say after reading it:
This is going to make the hairy boy next door cry.
But then again, the phased array radar, which claims to be the king of radar, was taken to prevent wild boars?
Military technology to prevent wild boars
In fact, the reason is very simple, because wild boars are too difficult to deal with.
They often go down the mountain in groups, enter the field to eat, and also arch a few times in the field, and root out some crops, which will bring very serious losses to farmers.
However, wild boars are also nationally protected animals, and unless it is a special hunting operation, the general farmer can only do to drive them away.
This is not an easy task.
Because wild boars are large, fast moving, aggressive, and not afraid of people, the general method of driving away is strong light, torches, harsh noises, or protective fences.
These methods have high requirements for human and material resources, and the effect is not necessarily good.
Based on this status quo, it is not difficult to understand why the peasant brothers would think of using phased array radar here.
Phased array radar is called phase-controlled electronically scanned array radar.
Its biggest feature is that it can quickly and accurately change the beam to complete the scanning of the entire airspace.
Multiple targets can also be monitored simultaneously, and the detection range can even reach thousands of kilometers.
It works a bit like the compound eyes of dragonflies and flies.
There are a lot of tiny units arranged regularly on the radar board, each of which can transmit and receive signals individually.
When the waves emitted by these independent units propagate outward at the same time, the interference of the waves occurs between them.
If the emitted waves are not fully synchronized, a phase shift will occur between the two ripples, and the phase difference of the electromagnetic waves emitted by each unit can be controlled by the computer, so that the waves can propagate in the direction they want to go.
This method is called electrical scanning, and it is much faster than the mechanical scanning of traditional radar, that is, turning the antenna.
Depending on the number of transmit/receive components enabled, phased array radar can be divided into two types.
Passive phased array radars have only one central transmitter and one receiver, while active phased arrays are equipped with a transmit/receive component for each emitter.
Active phased array radar has more powerful performance and higher cost, which is generally discussed more.
The civilian phased array radar mentioned at the beginning belongs to this category.
Officially, it can monitor moving targets and automatically identify and classify them, with a monitoring angle of up to ±45 degrees.
It can detect pedestrians within 5 kilometers, vehicle targets within 10 to 15 kilometers, drone targets from 3 kilometers away, and boat targets from 10 to 30 kilometers.
Like this, once two people are lifted, one radar can be installed outdoors, and thunder, rain and snow and other weather can be carried.
It can also be used in places with poor communication conditions, and the bandwidth requirement is only 8Mbps. It is said that it is not difficult to use, and non-professionals can quickly get started.
The company also emphasized that "the core components such as TR components and active phased arrays are self-developed, and the cost is controllable and the supply is guaranteed."
All in all, the high-end electronic equipment used in the impression on aircraft carriers and fighters is now not only civilian, but also the threshold for use and the price are not high.
This makes people curious:
How did the phased array become cabbage to this extent?
The key also looks at gallium nitride
This is mainly related to the material development trend of the core components of active phased array radar.
The core component of phased array radar is the T/R component, which accounts for about 60% of the total radar cost.
After entering the 21st century, the main material of this component is gradually changing from gallium arsenide to gallium nitride to increase the power of radar.
Gallium nitride must be very familiar to everyone, as a third-generation semiconductor material, it has become a material with a high degree of discussion with its superior performance in high-power, high-speed optoelectronic components.
Due to the higher breakdown voltage, the current and corresponding energy loss can be reduced by significantly increasing the voltage, and the energy utilization and power will be greatly improved after the use of gallium nitride in the T/R component, the core component of phased array radar.
In this way, radar performance using gallium nitride can be improved, and heat dissipation problems are relatively weakened.
More critically, the cost of gallium nitride can be reduced by about 30% compared to imported ganide materials.
The current gallium nitride industry chain in the mainland is relatively more complete, like an ordinary fast charger, using this material.
In addition, the product structure of phased array radar T/R components has begun to evolve from "brick" to "tile type".
The advantage of "tile type" is that it can reduce the number of printed circuit boards and connectors, and can reduce the volume and weight of phased array radar through large-scale microblog manufacturing technology and packaging process, which can also further reduce costs.
In fact, the civilian use of phased array radar has far exceeded our imagination, such as meteorological detection, water conservancy and flood control, 5G communications and other fields.
There are not many civil scenes
Among them, the fastest growing field is the field of meteorological detection.
Compared with traditional weather radar, the function of phased array weather radar is simply a dimensionality reduction strike.
For example, Beijing Daxing Airport uses a C-band all-digital active phased array weather radar.
A 11-layer volumetric scan of a conventional weather radar takes 6 minutes to complete, while the radar takes only 1 minute to complete. At the same time, the radar adopts distributed transmission and reception technology, and the reliability is improved from 600 hours of conventional radar to more than 3000 hours.
In addition, the radar comprehensively improves the noise suppression ability and anti-interference ability and automatic detection ability of the ground, and can find dangerous weather affecting aviation safety such as thunderstorms, strong winds, downspacks, wind shear and so on faster and more accurately, which can play a huge role in the monitoring of dangerous weather in air traffic control weather.
In addition to meteorological detection, last November, phased array radar was also used for the first time in field cultural relics security.
Shaanxi, a major province of cultural relics, has always been a big problem due to the large number and scattered distribution of monuments and sites.
Due to its fast response speed, high target update rate, strong multi-target tracking ability and high resolution, phased array radar can be said to be very professional.
At present, the phased array radar has carried out on-site testing and feasibility verification work in Lishan Park and Terracotta Warriors No. 1 Site Pit.
△Source: Shaanxi Provincial Cultural Security Institute
One More Thing
The heat of this wave of phased array radar also reminds people of a blind word that was once widely circulated...
It is said that the phased array radar weighing one ton of hair can heat a wild boar within 200 meters when it is activated at rest.
There are various other versions...
Well, if true, it's also an effective way to control wild boars (doge).
Reference Links:
[1]https://m.weibo.cn/status/4805932813124635
[2]https://www.sohu.com/a/501400643_100106801
[3]https://m.elecfans.com/article/1588672.html
[4]https://www.bilibili.com/video/BV1md4y1U7BD
[5]https://xw.qq.com/amphtml/20220729A02J4400
[6]https://baijiahao.baidu.com/s?id=1740221301992139719&wfr=spider&for=pc
[7]https://baijiahao.baidu.com/s?id=1715566817717352037&wfr=spider&for=pc
[8]https://zhuanlan.zhihu.com/p/349663246
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