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Text Chapter 424 Phased Array Antenna

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    For Zhang Wenhao, the products that can easily transcend the era are electronic products. The production of such products relies solely on semiconductor technology and chip technology. Therefore, whether it is radar or satellite, it is not a big problem for Dongchen.

    In addition, Xiaoer has merged the core technologies of radar and positioning satellites. Generally speaking, Dongchen can now combine the two for joint development.

    Whether it is radar or positioning satellites, they all need to have absolute control over the electromagnetic waves they emit, which causes great changes in the properties of electromagnetic waves. To put it simply, it is equivalent to setting up a communication with the subject for each electromagnetic wave.  The function allows electromagnetic waves to be emitted while feeding back their own trajectory and distance to the subject in a timely manner. The coverage area of ??phased array radar is only a few hundred kilometers in radius, but satellites have to cover a huge area in high altitude.  area, and cooperate with other satellites to complete global seamless coverage. This project amount is very huge even for Dongchen, and Zhang Wenhao¡¯s initial entry point was radar.

    Zhang Wenhao used high-precision electronic processing production lines to reduce the size of the phased array antenna to a cylinder with a length of less than one centimeter and a diameter of less than 2 millimeters. This phased array antenna will be a high-end technology decades later. It not only has ordinary  The most important function of radar is that it has absolute control over the electromagnetic waves it releases.

    When the first miniature phased array antenna was produced, Zhang Wenhao immediately combined it with the radar body and computing chip and conducted an independent test on the single antenna.

    The detection range of general airborne radars will not exceed two hundred kilometers. The biggest problem is the limited power. After all, every kilogram of weight of the aircraft is very precious. It is impossible to bring a very powerful radar to the sky. Therefore, even if it reaches two hundred kilometers  The detection distance of one hundred kilometers only refers to the maximum distance. At this distance, the ability to detect targets is greatly weakened. Unless it is for large targets, small targets or targets that move too fast, it is basically only within a hundred kilometers.  It was found that due to problems with the radar antenna of airborne radar, the upward-looking distance is generally only about 100 kilometers, and the downward-looking distance is even shorter, most of which are maintained between 80-100 kilometers. This is also consistent with the altitude of the aircraft.  Limitation related.

    However, the phased array radar antenna designed by Xiaoer has a detection range of at least 300 kilometers. If the power is increased, the theoretical maximum detection range can reach 500 kilometers. Moreover, the electromagnetic waves of this radar can reach a distance of 500 kilometers.  There will be no deviation, and any special circumstances can be clearly perceived.

    This test of a single antenna was conducted by Zhang Wenhao alone, and of course, with the help of a waiter in his mind, a person and a virtual character.

    The entire set of radar host equipment and a single phased array antenna were carried to the courtyard outside the production line. Zhang Wenhao followed the waiter's request to open the radar and power the phased array antenna. He set the transmitting elevation angle of the phased array radar to 30 degrees.  At this time, the computing chip immediately analyzed and displayed the radar wave situation in real time.

    Zhang Wenhao looked at the display on the radar screen and said: "The radar just showed that the radar wave changed at a distance of 14 kilometers in an instant. A target point appeared on the radar, but it returned to a straight line after a second.  And the distance has returned to 300 kilometers, what is going on?"

    Without thinking, the waiter replied: "A reflection occurred at that moment."

    With that, the waiter added: "We only use one phased array antenna now, which also means that the detection range is very narrow, just like the light of a condenser flashlight. If it is 30 degrees and 14 degrees above the diagonal,  If a fast-moving aircraft or object passes by at a distance of 1,000 kilometers, it will reflect the radar waves in an instant, but after an instant, the aircraft will have left the detection range of the radar. If we install more than 10,000 antennas  , then we can carry out three-dimensional coverage in the entire airspace. In this case, our radar wave is no longer a line, but surrounds the entire three-dimensional package. No matter how fast the target is, it will be sensed by different antennas in turn.  The antenna then measures the changes in radar waves and can give a clear framework of the entire target movement."

    Zhang Wenhao nodded and said: "If this is the case, then even an aircraft with the best stealth performance has lost its stealth ability."

    "That's right." The waiter smiled and said: "Traditional radar waves are fool-proof. As long as there is no feedback reflection, the radar will determine that there is no target in a certain area and it is clean and safe. In this way, as long as there is no feedback reflection,  The radar reflective surface of the aircraft is small enough, so the radar is almost useless. But in the face of our radar, whether the aircraft absorbs or reflects it is meaningless. Our detection range is, for example, 300 kilometers.  Suddenly, an airplane appeared at the location, and it directed our mineIf all the radar waves are absorbed or refracted, then our computing chip can instantly calculate its position, shape and trajectory based on the change in distance and state of the radar wave.  "

    As he spoke, the waiter made an analogy and said: "Radar waves are like a heavy rain. The raindrops are extremely dense. In this case, once an object moves under the heavy rain, it is impossible to escape the coverage of the heavy rain. According to each  The trajectory of a raindrop can outline the opponent's actions in the heavy rain."

    Zhang Wenhao asked: "If this radar technology is applied to airborne radar, our radar will be able to detect the target immediately. However, for the fire control system, in addition to indicating the target, what else  help?"

    "It's not that helpful." The waiter said: "We are not planning to design a new fire control system. We can find countless targets at the same time, but how many targets can be effectively locked depends on the ability of the fire control system itself. Besides,  , this is also related to the firepower performance, and even if we have upgraded the fire control system, the current technical conditions of the air-to-air missile are not enough to cooperate well with this radar. Most of the current missiles are fire-and-forget.  state, lock the target, launch the missile, and leave the rest to the missile itself. However, whether the missile is guided by infrared or radar, once the opponent finds that the missile is approaching, there will be enough time to release interference bombs or even ** fuel.  And burn to interfere with the judgment of the missile. This kind of guidance system is very backward for this phased array radar."

    At this point, the waiter said again: "If you want to really apply radar to the attack field, then the missile guidance method will have to undergo a major upgrade. The missile no longer needs to rely on infrared guidance or its own radar guidance, but will all rely on phased array  Radar is used for guidance. For example, our phased array radar has discovered ten targets, and the fire control system has locked on these ten targets. The aircraft can launch four air-to-air missiles in one round at the same time, and the pilot has selected four targets.  Then the radar locks on these four targets throughout the process. When the pilot presses the missile launch button, the missile ignites and exits the cabin. At this time, the cooperation between the missile and the phased array radar is turned on. The phased array radar continuously transmits the respective targets to different missiles.  The latest and most accurate position information directly guides the missile to hit it. In this way, even if the opponent releases jamming bombs, it cannot interfere with the missile's judgment, because the missile is not making its own judgment, but relies entirely on the guidance of the main radar.  And the main radar will bite the opponent from beginning to end and will not be deceived by the opponent's methods, so in this case, the missile's hit rate will be greatly improved."

    Zhang Wenhao was stunned for a moment, and then said: "You mean, not only do you need to build radars, but you also need to build fire control systems, and then you also need to build missiles?"

    The waiter nodded and said: "That's right, one link after another. If you want to improve in an all-round way, none of them are indispensable."

    Zhang Wenhao asked back: "I also made the airplane engine. They just made an airplane cover and left all the rest to me?"

    The waiter smiled and said: "If you want to achieve comprehensive improvement, then this is the only way." After saying that, the waiter added: "And if we build it ourselves, we will not build the J-20. The overall launchability of the J-20  The design isn¡¯t great, and it doesn¡¯t look very good.¡±

    "Forget it." Zhang Wenhao waved his hand and said: "Without thinking so much, let's build the radar in a down-to-earth manner, which will greatly improve the air defense capability. If we follow what you said, comprehensive  Upgrade, then you don¡¯t need to have many such aircraft, twenty of them will be enough to handle the country¡¯s air defense.¡±

    Immediately, Zhang Wenhao made an analogy and said: "For example, if we have such an aircraft on hand, we will be the first to discover and bite the enemy when the opponent is still 500 kilometers away from us, and then the missile's hit rate will be high.  It¡¯s amazing. As long as the payload is sufficient, the battle damage ratio can be infinitely increased. If two of these aircraft are mixed in a squadron, they can wipe out an entire opponent¡¯s flight group.¡±

    The waiter smiled and said: "If we upgrade to a shape and special paint without any radar reflective surface, basically going to any airspace will be like entering an uninhabited land. If the aerodynamic performance is further improved, the aircraft speed will reach Mach 3.  Above, basically interspersing two rounds in the air combat area, the opponent will basically have very few left."

    "No, no, no." Zhang Wenhao waved his hand hurriedly and said: "It's completely unnecessary. If we do this, we will probably become a global public enemy. We should just build radars as planned!"

    The waiter smiled and said: "Basically, there are no problems that need to be overcome. Our phased array antenna has met the design requirements. The only thing left is to densely cover more than 10,000 phased array antennas on a radar antenna. In this case,  Radar becomes it.¡± (To be continued. If you like this work, you are welcome to register as a Piaotian Literature member to recommend this work. Your support is my most importantBig motivation.  )
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