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1. 发明授权

US3870992A Radar system 失效
标题翻译：雷达系统
公开(公告)号：US3870992A
公开(公告)日：1975-03-11
申请号：US24756872
申请日：1972-04-26
申请人： AII SYSTEMS
发明人： HANNA JR DREXEL W
IPC分类号： G01S7/28 , G01S7/292 , G01S9/02
CPC分类号： G01S7/2925 , G01S7/28
摘要： In a radar system especially suitable for collision avoidance of ships at sea, the azimuth reporting resolution is improved by transmitting the radar signals so as to occur a plurality of times during the angle of beamwidth of a rotating radar antenna, and comparing the resulting echoes of successive radar signals that occur at time periods corresponding to various ranges and identifying as target signals only those of the echoes in the respective range periods occurring for a certain plurality of scan cycles within the antenna beamwidth angle. The bandwidth requirements of the system for communication from a plurality of such mobile stations to a central station are reduced by digitizing at the ships the range and azimuth data corresponding to said identified target signals and by treating as valid target signals those echoes that are repeated over successive frame cycles, and by reporting to the central station only such target information. Those echoes that are not repeated over successive sweep cycles are treated as non-target information or false alarms. A noise threshold for the detection of echo signals at the input is adjusted depending upon the number of false alarms (non-repeated target signals) in a frame. Only a limited number of targets at any azimuth location are reported. If at some point the number of valid target signals in an antenna frame matches some predetermined value, then the target data for only that first portion of the frame are reported to the central station. During the succeeding frame, the report to the central station starts at the azimuth limit where the previous frame report left off.
摘要翻译：在特别适用于海上碰撞避雷的雷达系统中，通过在雷达天线的波束宽度的角度内发射雷达信号多次，提高方位报告分辨率，并比较得到的回波在相应于各种范围的时间段发生的连续的雷达信号，并且仅识别在天线波束宽度角内的某个多个扫描周期内出现的各个范围周期内的回波的目标信号。通过在船舶上数字化与所识别的目标信号对应的范围和方位数据，并且将作为有效目标信号的那些回波视为重复的方式来减少从多个这样的移动站到中心站的通信系统的带宽要求连续的帧周期，并且只向中心站报告这样的目标信息。那些在连续扫描周期内不重复的回波被视为非目标信息或假警报。根据帧中的错误报警（非重复目标信号）的数量来调整用于检测输入端的回波信号的噪声阈值。报告在任何方位位置只有有限数量的目标。如果在某一点天线帧中的有效目标信号的数目与某个预定值相匹配，则仅将帧的第一部分的目标数据报告给中心站。在接下来的框架中，中央车站的报告从前一帧报告停止的方位角开始。

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