发明名称 |
DELTA-SIGMA DIGITAL RADIOMETRIC SYSTEM |
摘要 |
A passive radiometric system for thermally imaging objects in a scene. The system includes a digital square-law quantizer circuit including a plurality of comparators and a voltage divider network having a plurality of resistors. Each comparator receives a different reference signal generated by the voltage divider network and a common power signal from an antenna and outputs a high or low digital bit signal. The system also includes a delta-sigma circuit having a weighting table responsive to the digital bit signals from the comparators that converts the digital bit signals to a normalized bit word. The delta-sigma circuit also includes an accumulator that receives the digital bit words from the weighting table and provides an average of the digital bit words. The system also includes a digital-to-analog converter that converts the averaged bit words to an analog signal that is provided as a feedback signal to the quantizer circuit. |
申请公布号 |
WO2016133666(A1) |
申请公布日期 |
2016.08.25 |
申请号 |
WO2016US15213 |
申请日期 |
2016.01.27 |
申请人 |
NORTHROP GRUMMAN SYSTEMS CORPORATION |
发明人 |
SMITH, Andrew, D.;GILREATH, Leland;THAI, Khanh |
分类号 |
H03M1/48;H03M1/18;H03M1/20;H03M1/36 |
主分类号 |
H03M1/48 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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