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1. 发明授权

US06377167B1 Multi frequency photoelectric detection system 失效
标题翻译：多频光电检测系统
公开(公告)号：US06377167B1
公开(公告)日：2002-04-23
申请号：US09674215
申请日：2001-05-01
申请人： Scott Juds , Paul Mathews , Robert I Lewis
发明人： Scott Juds , Paul Mathews , Robert I Lewis
IPC分类号： B60Q100
CPC分类号： G01S17/936 , G01S7/4811 , G01S17/36 , G01S17/87 , G01S2013/9332
摘要： Collision avoidance apparatus (28, 30) is mounted on a host vehicle (20) to detect the presence of an adjacent vehicle (22) within a monitored zone (24, 26). A sensor module (30) includes a plurality of discrete sensor systems for monitoring unique portions of the monitored zone (24, 26), each of which comprises an emitter (52) emitting a fixed frequency modulated beam (58) of light energy (54) with a predetermined burst length into its unique portion of the monitored zone (24, 26), and a receiver (68) having a field of view (62), substantially aligned with emitted beam (58) to produce a fixed optical overlap area (A), and for sensing light energy (66) and generating a received signal. A frequency generator (48) produces two or more predetermined different fixed frequencies for use by the emitter (52) to emit beams (58) at each frequency. A phase shifter (70) produces a phase shifted reference signal with a different predetermined phase delay relationship to each fixed frequency. A mixer (72) mixes each received signal and each phase shifted reference signal to produce demodulation signals from for each frequency. A processor (40) receives and processes accoupled logic level detection signals generated by a limiter amplifier (76) for each discrete sensor system at each of the fixed frequencies to determine the presence of a vehicle (22) in the monitored zone (24, 26). The fixed frequency and the predetermined phase delay are chosen to produce a null received signal resulting from reflections of the emitted beam from uniformly distributed atmospheric backscatter within the optical overlap area (A).
摘要翻译：碰撞避免装置（28,30）安装在主车辆（20）上以检测在监视区域（24,26）内的相邻车辆（22）的存在。传感器模块（30）包括多个离散传感器系统，用于监测所监视区域（24,26）的独特部分，每个部分包括发射光（58）的发射器（52））具有预定的突发长度进入其被监视区域（24,26）的独特部分，以及具有与发射波束（58）基本对准的视场（62）的接收器（68），以产生固定的光学重叠区域（A），并且用于感测光能（66）并产生接收信号。频率发生器（48）产生两个或更多个预定的不同固定频率，供发射器（52）在每个频率下发射波束（58）。移相器（70）产生具有与每个固定频率不同的预定相位延迟关系的相移参考信号。混合器（72）将每个接收的信号和每个相移的参考信号混合以产生针对每个频率的解调信号。处理器（40）在每个固定频率处接收并处理由限幅放大器（76）产生的用于每个离散传感器系统的耦合逻辑电平检测信号，以确定车辆（22）在被监视区域（24,26）中的存在）。选择固定频率和预定相位延迟以产生由光重叠区域（A）内均匀分布的大气背散射的发射光束的反射产生的零接收信号。

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