Secret ** anti-radar camouflage [hidden fiber]

In the modern information warfare, "the goal will be destroyed once it is discovered" has become an indisputable fact. In recent years, the research on counterfeit protection technologies for high-tech reconnaissance and weapon strike systems is in the ascendant, and various types of high-tech camouflage deception techniques have also emerged. They have also appeared on stage.

**Radar awareness;

**Radar is an electronic device that uses electromagnetic waves to detect targets. The electromagnetic waves emitted by the radar irradiate the target and receive its echoes, from which the direction and speed of movement and other characteristics are known.

For example, the fighter radar is a Doppler radar or a phased array radar. The airborne radar is the most important detection system for fighter detection and tracking targets. It can work throughout the day and is not limited by day or night or weather conditions. The electromagnetic beam emitted by the radar is scanned in the air and can not only detect the orientation of the target but also detect its distance and speed.

Most modern fighter radars use the pulse Doppler system, which uses the Doppler effect of the moving target to generate frequency shifts and filters out ground clutter, which allows them to look down and see the targets of ultra-low flight.

Airborne radar can detect not only aerial targets but also ground targets with multiple operating modes. Air-to-air work modes include: search, multi-target tracking, side-scanning, and directional guidance. The air-to-ground model includes air-ground distance measurement, terrain mapping, terrain following and avoidance.

Airborne radars generally consist of antennas, transmitters, receivers, digital signal processors and computers. The antenna is installed in the radome of the aircraft nose. At present, most aircraft still use mechanical scanning antennas, some have adopted electronically scanned passive phased array technology, and the latest is an active phased array. Active phased array antennas have the advantages of long range detection, high reliability, good stealth characteristics, and the ability to work in multiple modes at the same time.

**Requirements for anti-radar camouflage [hidden fiber]:

Modern weapons and other equipment have been researched to protect the secretive technology and try to carry out all military operations to achieve the final victory without the enemy being aware of it.

In order to prevent reconnaissance and attack of fighter planes, naval vessels, etc. on ground military facilities and personnel, the anti-radar camouflage technology of such facilities and personnel is very important. A new generation of ** anti-radar camouflage [hidden fiber] has emerged as the times require. , And the use of [hidden fiber] to develop a series of military supplies, such as **, tents, covering supplies, etc., is a very wide range.

**Anti-radar camouflage [hidden fiber] principle;

Since the radar uses electromagnetic waves to detect the target, electromagnetic waves irradiate the target and receive its echoes to find the target and determine the position. Therefore, this kind of fiber material must have the function of absorbing electromagnetic waves.

Requirements for absorbing electromagnetic wave functional materials:

Characteristics of radar absorbing materials, silicon carbide fibers as absorbing materials for radar structure absorbing materials, and reinforcing agents. This gives the silicon carbide fiber radar wave absorption function.

There are four ways to give fiber;

(1) High temperature treatment method;

(2) Surface treatment method:

(3) Doping different element method:

(4) Change the fiber cross-section shape method:

Researchers from all countries compare the advantages and disadvantages of the four methods and extend their research directions in the future.

**Anti-radar camouflage [hidden fiber] research:

Researchers from various countries have developed different technologies and production methods. They are more commonly used:

(a) The electromagnetic wave absorption performance of the polyester matrix composites with different mass fractions of CNTs was investigated. The analysis of the spiral structure and chirality of CNTs resulted in a good absorption in the 8-40 GHz band. Among them, CNTs/polyester composites with a thickness of 1.40mm±0.05mm have strong absorption peaks at 25GHz.

(b) Develop a specific resistance of 10 ↑ [2] to 10 ↑ [4] Ω with a conductive treatment solution. Cm containing polyacrylonitrile fibers, the production methods include the preparation of conductive treatment liquid, conductive fiber and other steps. Since the anti-radar camouflage [hidden fiber] is a fiber containing polyacrylonitrile treated with a conductive treatment solution, the conductive component must be uniformly distributed on the polyacrylonitrile fiber during the conductive treatment, so that the lightning protection using the fiber is woven. Dabba's attenuation performance over the broadband band is consistent.

**Application prospects of radar camouflage [hidden fiber]:

At present, all countries have secretly researched and established research directions. Recently, the Ministry of National Defense of the Republic of Korea has cooperated with the Ministry of Knowledge Economy in open cooperation and signed the "Memorandum of Understanding on Fiber Technology Cooperation" at the Sanchengdong Fiber Center. According to this, the two ministries will jointly develop. [hidden fiber].

The South Korean government will develop a step-by-step approach to avoid the “stealth textile” discovered by radar, adding information and communication capabilities to make smart clothing.