00567299

Proceedings o f ICSP’ 9 6 A High Speed Radar Data Acquisition an d Processing System Yulan Wang Souyong Shan Cailiang Teachmg & Research Section of Signal Processing Air Force Radar Academy, Wuhan 43001 0, China Abstract This paper presents a high speed radar data acquisition and processing system.The system can samples radar echo signal at a sampling frequency as high as 1 0 0 MHz. Cooperated with associated software, it can analyze and process sampled data at real time. The special features o f the system include that the sampling frequency as high as 100 MH z can meet th e requirements of various radar data processing. The high speed parallel processor in the system possess a block structure, so that the number o f its signal processing boards can b e increased or decreased according to the requirem ents of algorithms. Many advanc ed techniques in computer hardware and software are adopted in the system, such as imitating radar PPI display technique, azimuth and distance wavegates controlled sample technique,high I low speed sample automatic conversion technique, parallel memory interleaving technique, shared storage and page management techniques and so on. It can be properly used in sampling, storing and processing radar target echo signal and clutter signal, so as to establish a database of radar target echoes and clutters. Cooperated with radar target recognition software, the system may be considered as a radar target recognition system. 1 . Introduction The high sped radar data acquisition an d processing system is specially designed to sapmle radar echo signal at a high speed and process the data at real time while the radar antenna is tunring in all directions. The system consists; of a high speed data acquisition equipmenil, a high speed parallel processor, a microcomputer and a high resoluti on monitor ( as shown in Fig. 1 ) . The high speed data acquisition equipment ca n sample radar echo signal at a frequency as high as 10 0 MHz. It has two operational mode: The one is low speed sample mode, the sampling frequency is 3 MHz. the sampled data are provided fo r microcomputer to detect targets so as to imitate radar P P I display. The other i s high speed sample mode, the sampling frequency ca n b e selected from 1 0 0 MHz, 5 0 MHz. 25MHz according to the requirements, the high speed sample occurs only in the azimuth and distance wavega tes, the sampled data are sent to microcomputer for storage to establish a database in future, it can also b e provided to the high :speed parallel processor to implement the reall time data analysis and processing. The high speed parallel processor is made up o f several digital signal processing boards with a same structure. It is used to perforni various complicated (digital signal processing algorithms . 0-7803-2912-0 449

00567299

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