Zhang Zhizhong was the executive director of the Chinese Institute of Electronics; Chairman of Radar Society of Chinese Institute of Electronics; Chairman of Jiangsu Institute of Electronics, member of Science and Technology Committee of Ministry of Electronics Industry; Vice Chairman of Science and Technology Committee of Radar Bureau of Ministry of Electronic Industry; Member of the Military Electronics Industry Review Committee of the National Defense Science and Technology Progress Invention Award; Editorial Board of China Encyclopedia of Electronic Computers and Editor-in-Chief of Radar Writing Group. In addition, he also serves as professor xidian university, tutor of master students and doctoral students, and has trained 8 master students and 3 doctoral students successively.
1953, Zhang Zhizhong was ordered to preside over the imitation of Soviet-style п-3 radar. At that time, the technical environment was very poor, there were no drawings and materials, only a prototype lacking an antenna. He is responsible for radar system demonstration and antenna feed design. Through the efforts of him and other comrades, the first domestic medium-range warning radar was successfully trial-produced, and the history of radar design and production in China began.
Since China entered the independently designed radar, Zhang Zhizhong has the confidence and determination to keep up with the international advanced radar level. He carefully studied the new technology and new trend of foreign radar, and put forward a series of implementation schemes adopting new systems and technologies according to the specific situation of our country.
1957, Zhang Zhizhong, then deputy chief engineer of Ren Guoying 720 Factory, accepted the task of developing low-altitude warning radar (scheme demonstration). He thinks that the moving target display radar system should be adopted, which is the first time in China, and puts forward that two problems should be solved first to reduce the intensity of ground clutter: one is the cotangent square antenna with low strike energy, and the other is the ground clutter cancellation technology. According to the direction he pointed out, he carried out technical research and achieved results, and finally developed China's first micro-undulating target display radar.
From 65438 to 0958, fourteen institutes were ordered to develop the first large-scale ultra-long-range tracking radar in China. As the technical director, Zhang Zhizhong scientifically analyzed the development of radar technology abroad and the technical basis of domestic electronic industry. First of all, he thinks that the development of ultra-long-range tracking radar has lagged behind the "Moshishan" radar in the early 1950s in the United States, because this kind of radar adopts conical scanning mode, and the improvement of angle tracking accuracy is limited by the amplitude fluctuation between pulses, while new technologies such as pulse compression and monopulse tracking are being developed internationally. The former can solve the problem of long detection distance and has high range resolution and ranging accuracy, while the latter can improve the angle tracking accuracy, push the distance tracking and have excellent anti-interference performance. Therefore, he thinks that the advanced ultra-long-range tracking radar should be monopulse angle measurement and pulse compression system, and the receiver should adopt anti-noise parametric amplifier. 196 1 year, under his auspices, the 14th Institute carried out the research on monopulse tracking system, and successfully developed the first four-feed differential monopulse experimental radar in China in 1964. It is proved that the accuracy of monopulse angle measurement is obviously better than that of conical scanning under the same conditions. This high-tech achievement also laid a solid foundation for the development of monopulse precision measurement radar in the "Missile and Satellite Radio Measurement and Control System" after the 14th National Congress.
Published the paper "Radar Signal Theory and Pulse Compression"
1962, Zhang Zhizhong published the paper "radar signal theory and pulse compression", which promoted the research of pulse compression technology in China's radar industry. The pulse compression project he presided over also proved that LFM pulse compression is superior to the two-phase coding scheme in performance and realizability. 1964, a 407 long-range warning radar was converted into the first LFM pulse compression test radar with body wave dispersion delay line in China, and the compression effect of the system was verified, and the practical experience of radar pulse compression technology system design was obtained. In 1964 and 1965, due to the development of long-range and ultra-long-range radars in China, he proposed to explore various methods of generating and processing LFM signals to meet the needs of different radars. Under the auspices of Zhang Zhizhong, No.14 Institute has made great progress in the development of dispersion delay line and pulse compression circuit technology, which can provide dispersion line and pulse compression circuit for different radars. A series of pulse compression technology achievements of the 14th Institute were first used in 1 10 ultra-long-range precision tracking radar, then used in 583 swept-frequency coordinate test radar, 70 10 phased array early warning radar,11over-the-horizon experimental radar,/.
Phased array early warning radar
In the 1960s, when discussing and implementing Chairman Mao's strategic defense thought of "where there is a spear, there is a shield", Zhang Zhizhong proposed that China's strategic early warning system should adopt the advanced phased array early warning radar newly developed in the world. The antenna wave velocity of this radar adopts electric scanning, has no inertia, can jump quickly in space, has the ability of simultaneous search and multi-target tracking, and is the most effective missile early warning system. If we use the old scheme of foreign countries in 1950s, that is, two ultra-long-range tracking radars with mechanical scanning are used to carry out the early warning task, the alarm will miss the target seriously because of the large inertia of the antenna, and it can only deal with a few targets, which is not suitable. Moreover, the realization of phased array system must use computers, and China just started at that time, so it is considered that China has the possibility to develop a new type of phased array radar by itself. His directional technical scheme was adopted by the leaders of No.14 Institute, and theoretical analysis and experimental research on antenna unit, digital phase shifter, power divider, signal processing and data processing were carried out, as well as scanning experiments of receiving 32 units of phased array antenna, which laid the foundation for the development of practical phased array radar.
The 1 10 ultra-long-range precision tracking radar and 70 10 phased array early warning radar, which were researched in Zhang Zhizhong in the early stage, can detect outer space targets and play an important role in launching medium-and long-range missiles, artificial satellites and synchronous satellites in China. Their successful development has shortened the gap between China's radar technology level and the international advanced level, and attracted international attention. In 1979 and 1983,10 ultra-long-range tracking radar and 70 10 phased array early warning radar are the main detection equipment, which accurately tracked the "sky experiment" of the United States and the nuclear-powered satellite of the Soviet Union 1402. It has had a great influence at home and abroad.
Mechanical pulse Doppler radar is a new type of airborne fire control radar which appeared in 1970s. It has the ability to extract small flying targets from extremely strong ground clutter. 1980, Zhang Zhizhong accepted the task of developing airborne pulse Doppler radar as the chief engineer on behalf of the 14th Institute. Under his charge, he tackled key technical problems and achieved initial results in 1983. The main difficult projects are low sidelobe flat antenna, grid-controlled traveling wave tube transmitter and digital signal processor, which opened the way for the development of experimental pulse Doppler radar.
Imaging radar research
1988, Zhang Zhizhong 7 1 year-old, but the ambition is undiminished. He also studied the imaging radar and chose ISAR, which is a very difficult but excellent subject. This is one of the tasks of the national high-tech "863 Plan". Zhang Zhizhong instructed two doctoral students to focus on two aspects of research work: first, how to compensate for complex fast moving targets; The other is how to obtain a high-resolution two-dimensional image of the target after motion compensation. By the first half of 1990, preliminary achievements have been made in theoretical analysis, computer simulation and turntable imaging experiment.
Zhang Zhizhong published three monographs, Selection and Processing of Radar Signals, Synthetic Aperture, Inverse Synthetic Aperture and Imaging Radar and Microwave Imaging, in 1979, 1986 and 1990 respectively. In addition, since the 1960s, he has published about 20 papers in academic journals and academic conferences at home and abroad.
Zhang Zhizhong loves the motherland and socialism. He is rigorous in his studies, seeking truth from facts, diligent in exploration and keen on cultivating new forces. He is never satisfied with his academic achievements, especially keeping a close eye on foreign high-tech development trends, keeping abreast of the development trend of new radar technology in the world, and using his own efforts to make China track and narrow the gap with the international advanced level in radar technology. He is an engineering advocate for developing China moving target display radar, monopulse precise tracking radar and phased array early warning radar. He is an academic leader in developing pulse compression radar technology, pulse Doppler radar technology and microwave imaging radar technology in China. He has made great contributions to the development of radar in China.