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    • 3. 发明授权
    • Radar clutter simulator
    • 雷达杂波模拟器
    • US4644357A
    • 1987-02-17
    • US772581
    • 1985-09-04
    • Gregory SchaafGarin S. Bircsak
    • Gregory SchaafGarin S. Bircsak
    • G01S7/40G09B9/54
    • G09B9/54G01S7/4052G01S2007/4082
    • The simulation of clutter echo return signals for a radar system is accomplished using two sets of diode noise sources, a frequency synthesizer for bandwidth control, multiplexing control, two D/A converters and mixers, a 90-degree sower splitter, and a summer; the output of the summer being the simulated clutter. The two sets of noise sources each produce a digital encoded controlled bandwidth Gaussian noise signal which is strobed by the multiplexing control unit firstly to the pulse repetition interval of the radar system and secondly to the data rate of the radar system. The two strobed D/A converters convert the two digital noise signals into their analog equivalents. The two separate video channels are required to obtain the Rayleigh noise distribution characteristic of clutter. This distribution results when the analog signals from the D/A converters are multiplied with in-phase and quadrature RF reference frequencies in the two mixers, then summed in the summer.
    • 用于雷达系统的杂波回波信号的仿真是使用两组二极管噪声源,用于带宽控制的频率合成器,多路复用控制,两个D / A转换器和混频器,90度分配器和夏季来实现的。 夏天的输出是模拟的杂乱。 两组噪声源各自产生数字编码的受控带宽高斯噪声信号,其首先由多路复用控制单元选通到雷达系统的脉冲重复间隔,其次是雷达系统的数据速率。 两个选通D / A转换器将两个数字噪声信号转换为模拟等效。 需要两个分离的视频通道来获得杂波的瑞利噪声分布特性。 当D / A转换器的模拟信号与两个混频器中的同相和正交RF参考频率相乘时,会产生这种分布,然后在夏季求和。