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    • 4. 发明授权
    • System and method for minimizing background noise in a microwave image using a programmable reflector array
    • 使用可编程反射器阵列来最小化微波图像中的背景噪声的系统和方法
    • US07327304B2
    • 2008-02-05
    • US11088830
    • 2005-03-24
    • Izhak BaharavRobert C. TaberGregory S. Lee
    • Izhak BaharavRobert C. TaberGregory S. Lee
    • G01S13/00H01Q15/00
    • G01N22/00
    • A microwave imaging system captures a microwave image of a target and minimizes noise in the microwave image using phase differentiation. A reflector antenna array is provided including a plurality of antenna elements for reflecting microwave radiation towards the target and for reflecting microwave radiation reflected from the target towards a microwave receiver. A processor programs the antenna elements with respective first phase shifts to capture a first microwave image of the target, and programs the antenna elements with respective second phase shifts to capture a second microwave image of the target. The first phase shift of each antenna element is 180 degrees different than the second phase shift for that antenna element. The processor minimizes noise from a combination of the first microwave image and the second microwave image.
    • 微波成像系统捕获目标的微波图像,并使用相位微分使微波图像中的噪声最小化。 提供了一种反射器天线阵列,其包括多个天线元件,用于将微波辐射反射到目标物并用于将从目标物反射的微波辐射反射向微波接收器。 A处理器以相应的第一相移对天线元件进行编程以捕获目标的第一微波图像,并且用相应的第二相移对天线元件进行编程以捕获目标的第二微波图像。 每个天线元件的第一相移与该天线元件的第二相移成180度。 该处理器使来自第一微波图像和第二微波图像的组合的噪声最小化。
    • 10. 发明授权
    • Superconducting analog-to-digital converter with floating four-junction
squid bidirectional counter
    • 具有浮动四联鱿鱼双向计数器的超导模数转换器
    • US5012243A
    • 1991-04-30
    • US397932
    • 1989-08-24
    • Gregory S. Lee
    • Gregory S. Lee
    • H03M1/48
    • H03M1/48Y10S505/827
    • A high-speed, high-resolution superconducting counting A/D converter providing greatly increased conversion speeds with a low device count. The superconducting counting A/D converter includes includes a double-junction SQUID quantizer and a bidirectional binary counter having n stages of floating four-junction SQUID flip-flops, where n is the number of bits of accuracy of the counter. The quantizer continuously tracks an analog signal, generating up-count and down-count voltage pulses of the same polarity on two different output lines for increasing and decreasing values of the analog current, respectively. The bidirectional binary counter algebraically counts the voltage pulses, increasing the binary count when up-count pulses are received and decreasing the binary count when down-count pulses are received. Several techniques for reading the contents of the bidirectional binary counter at the end of each sampling interval are also disclosed.
    • 高速,高分辨率超导计数A / D转换器,提供极高的转换速度,并具有较低的器件数量。 超导计数A / D转换器包括双结SQUID量化器和具有n级浮置四结SQUID触发器的双向二进制计数器,其中n是计数器的精度位数。 量化器连续跟踪模拟信号,在两个不同的输出线上产生相同极性的递增计数和递减计数电压脉冲,分别增加和减小模拟电流的值。 双向二进制计数器代数地对电压脉冲计数,当接收到递增计数脉冲时增加二进制计数,并且当接收到递减计数脉冲时减少二进制计数。 还公开了在每个采样间隔结束时读取双向二进制计数器的内容的几种技术。