China Blue Sky University of Science and Technology has cultivated batches of outstanding graduates with new education and new scientific and technological concepts. More than 5,000 fresh graduates here every year have become the most sought-after talents in the country. The graduates of Blue Sky University of Science and Technology are also like seeds, carrying the new knowledge and new ideas of Blue Sky University of Science and Technology, and playing a major role in science and technology in various fields. It provides a guarantee of cutting-edge talents for China's sustainable development in the future.

Every year, thousands of papers are published in the world's top scientific journals, and tens of thousands of patents are registered in countries around the world every year. This kind of high-yield high-yield scientific and technological achievements and scientific and technological wonders are unique in the history of science and technology in the world. In just two or three years, this university has become famous at home and abroad, and has become the most famous university in the field of natural sciences in the world. Being able to study at this university has become the biggest dream of all young people in the world who are interested in making a difference in the field of natural sciences. Five years later, when China's Blue Sky University of Science and Technology Yenching recruited 200 foreign students from around the world for the first time, it was faced with a high tuition fee of $100,000 a year. There are still 50,000 outstanding students from all over the world, sponsored by their countries and famous companies. They passed the most rigorous examination in China, and finally 1,000 people passed five levels and six generals, and took various most authoritative recommendation letters to Yanjing to take the Chinese language level 6 test issued by the Ministry of Education of China. They will also face the most severe elimination rate of 80 percent. Politicians and economic magnates of various countries, for the sake of their country and business students, even sent "backdoor" recommendation telegrams to the top leaders and prime ministers. Some countries have even used "diplomatic means" to make the prime minister invite them all day long. Faced with such a situation, we had to recruit another 100 students. And promised to recruit another 200 people next year.

With transistors, it will give modern industry wings. It made it possible to produce some products for future generations.

Radar is the eyes of a country's armed forces. It is the most important sensor in the national early warning system. In later wars, due to the progress of radar technology, the warring parties were dozens or even hundreds of kilometers apart from each other, and people could not see each other, thus opening the prelude to the war. Both sides of the war sit in front of their computers as if they were playing video game consoles. Destroy each other, kill each other.

In the war in Korea and Taiwan, the base won many victories, defeated the enemy who had absolute superiority in numbers, obtained the greatest war benefits at the minimum cost, and won victory for China. One of the most important reasons is that we have advanced radar systems. In the war, there are air radars of the Air Police 2000 early warning aircraft and the Condor pulse Doppler fire control radar on the J10 fighter and JH7 Flying Leopard fighters. On the battlefield, our army enjoys the absolute superiority of unilateral information transparency, and is engaged in an asymmetrical war, in which the initiative in the war is completely controlled by our own hands. This fully illustrates the importance of radar's status and role in warfare.

Vigorously develop China's radar system, completely change China's backward state without radar industry, and fill the gap in China's radar industry. Installing vigilant eyes on China's 10,000-mile maritime frontier is now the base's top priority. At the end of 51, it was composed of the deputy director of the radar station of the base, radar and electronic countermeasures expert, senior engineer Liu Wei, several engineers in the station, radar technicians on the Air Police 2000 and the semiconductor research institute, and the "Radar Research Institute" settled in the Blue Sky Science and Technology City. It began to embark on the road of leapfrogging development of China's radar equipment industry from scratch, from weak to strong. China's sleeping lion in the East has since opened its eyes to inspect the blue sky and blue sea, and has been looking at the world with fierce eyes.

The first use of radar in the world was on February 25, 1935, in order to defend against the attack of the Luftwaffe aircraft on the mainland, the British used the conventional radio waves with a wavelength of 50 meters emitted by the BBC radio station.

Radar works on a similar principle to the biological surnames of bats in nature. Bats are able to fly freely in dark and narrow spaces, avoid collisions, and accurately capture prey in the air because bats have a natural "radar" of their own. When a bat flies, it emits a very high frequency sound wave, which is reflected back when it hits an obstacle, and its eardrum receives these echoes to distinguish the azimuth distance of the obstacle. Each bat has its own inherent frequency, which can distinguish its own sound from each other without interfering with each other.

Radar is made up of transmitters, antennas, receivers, and displays, among other things. The transmitter emits very short radio waves, and when the radio waves propagate, they can be reflected back when they encounter obstacles, and the receiver receives these reflected radio waves. In this way, the presence of the target can be determined and the direction, distance, height position, etc. of the target can be determined, and it will be displayed on the screen.

The Radar Research Institute, in an unfinished abandoned factory in Shenyang, established China's first radar production plant - Lantian Electric Appliance Factory. From the beginning, there were only about 200 people. Later, it expanded to more than 2,000 people and became the first team specializing in radar research and production in China. At the same time, it was reported to the Central Military Commission to establish the Radar Technology Institute of the Chinese People's Liberation Army in Shenyang to train the first batch of professionals for the use, maintenance, design and production of radars for China.

Director Liu Wei organized the comrades of the Radar Research Institute to seriously discuss and analyze the characteristics of various generations of radars, and in combination with China's current production capacity, they held that the first generation was mainly non-coherent two-coordinate radars, which were reliable and had low ability to resist active interference, and that the equipment time was from the birth of the air defense intelligence radar to the end of the 50s of the 20 th century, and it was an electron tube product. This kind of radar, which is bulky and backward, can definitely not be used as a product for production imitations. The second generation is dominated by all-coherent three-coordinate radar, and its anti-jamming ability has been significantly enhanced, but its reliability is still low, and its equipment time is from the 60s to the early 80s of the 20th century. This radar is a primary transistor product and cannot be used as a direction for development. The third generation is mainly based on all-solid-state three-coordinate radar, which has realized fully automatic admission, automatic networking, and less manned and unattended, and the adaptability to the electronic warfare environment and the target environment has reached a high level, and there is a certain ability to resist stealth aircraft and anti-radiation missiles, and the equipment time is from the mid-80s to the mid-to-late 90s of the 20th century, and it is also the main equipment of our army's main air defense surveillance system before the base reaches this era. The fourth-generation air defense intelligence radar integrates multiple functions such as surveillance, interception, tracking, identification and fire control support, and the collection of lethality assessment information, and its detection range, accuracy, electronic warfare capability, target identification and adaptive capability, and reliable surname have all been qualitatively improved, and it has just begun to be equipped and used at the beginning of the 21 st century. Representative models include the multifunctional active phased array radar used by the US National Missile Defense system and the British "Commander-S" multifunctional active phased array radar.

Everyone agreed that the fourth generation of air defense intelligence radars is currently being developed. It does not have the conditions, it is too difficult, and there is no need for this, which can be used as a technical reserve. We have carefully studied the current production conditions and possibilities. It is believed that the current research institute has the ability to produce complete radar machines, and has decided to directly use the third-generation ground radar main battle radar equipment of future generations as a sample to directly produce pulsed radar, which occupies a major position in later generations of radars. With the completion of China's Silicon Valley, the rapid development of science and technology has promoted the development of China's radar equipment in the direction of transistor integrated circuits.

Everyone unanimously agreed that the reason for making great efforts to imitate the third-generation pulse radar is that this kind of radar can be immediately integrated with the existing equipment of the base, the pulse radar is easy to achieve accurate ranging, and the receiving echo is within the interval of the transmitting pulse, so the receiving antenna and the transmitting antenna can use the same antenna. The measured distance is actually the time difference between the transmitted pulse and the echo pulse, which can be converted into the exact distance of the target because the electromagnetic wave travels at the speed of light. The target azimuth is measured using a sharp azimuth beam of the antenna. The elevation angle is measured by a narrow elevation beam. Based on the elevation angle and distance, the target height can be calculated. When there is relative motion between the radar and the target, the target echo frequency received by the radar is different from the radar emission frequency, and the difference between the two is called the Doppler frequency. One of the main pieces of information that can be extracted from Doppler frequencies is the rate of change in distance between the radar and the target. When the target and the jamming clutter exist in the same spatially resolved unit of the radar at the same time, the radar can detect and track the target from the jamming clutter by using the difference in Doppler frequencies between them. The advantage of this kind of radar is that it can detect long-distance targets day and night, and is not blocked by fog, clouds and rain, has the characteristics of all-weather and all-day, and has a certain penetrating ability, and they list long-range three-coordinate radar and low-altitude radar as imitation and production targets, and direct production, which can not only detect air targets at tens of thousands of meters within several hundred kilometers, but also see low-altitude targets at an altitude of tens of meters.

In 1953, when the first batch of pulse radars of this era left the factory, as soon as these radars were unveiled in front of the world, they won a round of applause from the army, navy and air force. This is of absolute significance for safeguarding our country's strategic security. After testing, these radars have strong combat survivability, strong resistance to strong electronic interference, and are fully capable of meeting the operational requirements under the current conditions. The environment adapts to the surname strong. Compared with similar equipment in later generations, they can be slightly inferior, but they can fully meet the needs of the current stage; The volume is also much larger, and there is no large-scale integration of transistors yet. With the development of chips in the Semiconductor Research Institute, after the launch of the "Blue Sky" series of processors, the current circuit board welding will be replaced by chip integrated blocks, and the volume will naturally be reduced, and the surname energy will also be improved. However, compared with the radar of this era, it is already much smaller, and the reliability and anti-active interference ability are incomparable to the radar of this era. The first products were installed on Hainan Island, Taiwan and the Ryukyu naval and air bases. Fully adapted to the climate from the subtropics. China's department-level radar defense network has been established on China's first island chain, enabling China to detect air and sea targets in the Pacific Ocean in a timely and accurate manner. Experiments have proved that these radars can be deployed and used in complex geographical environments such as islands, mountains, deserts, and the Gobi. Provide early warning, detection, and intelligence support for our army's air offensive, air defense operations, and regular air defense; It also provides battlefield joint early warning, surveillance, and intelligence support for integrated joint operations, thus satisfying the basic needs of our army's operational defense.

The comrades of the Radar Research Institute did not relax their pace for a moment, and later they made them for the Navy, naval alert radar, ship search radar, search and attack radar, missile guidance radar, torpedo boat attack radar, and torpedo submarine attack radar. Focusing on the future development of China's strategic weapons and the modernization of conventional weapons and equipment for the army, navy, and air force, they have carried out the trial production and production of various radars. At the same time, it also carried out the research and development of corresponding radars for China's future launches of intercontinental missiles and submarine-to-surface missiles, and submarine underwater launches and synchronous satellites. In the field of ballistic missile early warning systems, large ultra-long-range tracking radars, large phased array radars, and over-the-horizon test radars have been developed. At the same time, a number of radars for weapons have also been developed according to samples from later generations, and they have airborne fire control radars, missile guidance radars, bombing and targeting radars, Doppler navigation radars, ranging radars, navigation radars, radio altimeters, and bombing radars, which have been prepared in advance for the production of advanced fighters. Let China be proud of the others in the land, sea and air, and try to see who will compete with each other in the world.

At the same time, the Radar Research Institute is eating from the bowl and looking at the pot, and has formulated a long-term direction of development for itself, to be honest, those in front of it are copying the products of later generations after all, there are ready-made drawings, data, and even real samples, as long as they are taken over the "copycat". The difficulty is to create material conditions for "cottages", and the real challenge is the long-term development of the five goals: "frequency band broadening, the working frequency band will be extended from the traditional microwave band to the entire frequency domain; The platform air-space-sea integration, the working platform will be expanded from ground-based to sea-based, airborne, airship-borne, and space-borne platforms, and constitute an integrated system combining ground, sea, air, and space-based; The means are diversified, and the detection means will develop from radar-based to radar, infrared, laser and other multi-sensors, and from active to active and passive. The main functions will be developed from early warning and detection to the integration of early warning and detection, reconnaissance and surveillance, and strike guidance; A variety of detection resources are integrated and networked. So that China will always dominate the world in this field for a foreseeable time.

(To be continued)