【摘要】 变基线双基地雷达实时测距系统王伟伦，潘振五，唐宏涛固定基线双基地雷达实时测距系统的研制在文献［１～３］上曾有报导．本文是在文献［３］的基础上新研制成的一种变基线双基地雷达实时测距系统．在本系统中，发射机是固定的，接收机放置在运动的载体（如汽车、舰船等...更多还原

【Abstract】 In 1989 the authors presented a new bistatic radar ranging system[3]. In comparison with Ref.[3], a newer range correction system is now presented with following specifications:(1) baseline length 200km(variable); (2) maximum correction range 240km;(3) azimuth coverage 360°;(4) altitude coverage 0～22.5 °;(5) angular increment 2.1°,(6) maximum range correction error≤0.5%(when the receiving beam sights a target and the difference of time delay t between receipt of the direct pulse and the scattered target echo pulse is equal or greater than 10μs);(7) correction operation speed 106s-1.The system is characterized by its real-time and precise range cormction, variable baseline length,and its ability to show target position with static deflection PPI display and range data readout apparatus.Within the overall range or 240km, following measures are adopted. Firstly, the value of trigonometric function is obtained from a hardware look-up- table when it is needed. Secondly, an initial program is added before main program to simplify computation. Thirdly. the range is consecutively corrected for every point at interval of 1μs in short distance (t≤100 μs) while in long distance (t>100 μs) it is consecutively corrected for every point at interval of 4 pei in this way we can both improve precision and reduce computation. Finally linear interpolation is used for points within 4μs interval.In the newer system, the transmitter is fixed, but the receiver is mobile with itS oboer (automobile,ship e.g.). Baseline length could be keyed in by an operator or imported directly from position sensors. Because the carrier moves slowly, it may be thought of as a fixed object during intermediate parameter calculation which is done by initial program and has no relation with air target position. Intermediate parameters prepared for range correction are stored in a RAM. They vary from time to time while the carrier moves. The jon for main program is to collect data from the RAM, look up trigonometric function table in EPROM according to azimuth and altitude coming from antenna angle coder, and then to compute the tange between target and receiver by an operation only involving addition and division.Range scan data used for PPI display is converted by a D/A converter and multiplied by sine signal and cosine signal respectively, which correspond with antenna’s azimuth. It causes the range scan line on display to wheel in synchronization with antenna turning.更多还原