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    • 1. 发明公开
    • A method and apparatus for precursor based radar
    • 一种用于基于前体雷达性能的方法和装置
    • EP1199580A2
    • 2002-04-24
    • EP01124323.5
    • 2001-10-19
    • Lockheed Martin Corporation
    • Pergande, Al
    • G01S7/41
    • G01S7/03G01S7/282G01S7/41G01S7/418
    • A method and apparatus is described for signal processing to identify an object in an environment. A precursor associated with an electromagnetic wave interacting with the object is received and a property of the object identified using precursor characteristics. The electromagnetic wave is transmitted with a characteristic including a pulse having a sharp rise time so as to generate the precursor. The pulse is generated using a circuit including capacitive discharge and a semiconductor device such as a Drift Step Recovery Diode. Alternatively the pulse may be generated using a microwave diode switch and a broadband semiconductor amplifier or a traveling wave tube amplifier. The characteristic may also includes a signal with a phase reversal generated by dividing the electromagnetic signal and phase modulating the first electromagnetic signal with the divided signal to generate the phase reversal so as to generate the precursor. A receiver may further establish channels corresponding to the possible precursor spectra and associate each channel with a corresponding possible material property associated with the object including water generated precursor spectra, radar absorptive material generated precursor spectra, and metallic oxides generated precursor spectra. A color display may include an image of the object with possible material properties displayed in a corresponding color in proportion to respective values associated with received precursor spectra.
    • 的方法和装置描述了用于信号处理以识别反对在环境。 与电磁波与该对象相关联的交互的前体被接收,并且使用鉴定的前体特性的对象的属性。 的电磁波的反式mitted具有特征包括具有尖锐的上升时间,从而生成前体的脉冲。 该脉冲是使用电路包括电容放电,并检查作为漂移阶跃恢复二极管的半导体装置中产生。 可替代地,脉冲可以使用微波二极管开关和一个宽带半导体放大器或行波管放大器产生。 特性可能因此包括与通过将电磁信号和相位与分频信号调制第一电磁信号,以产生相位反转,以便产生前体产生的相位反转的信号。 接收机可以建立信道。此外对应于可能的前体的光谱,并且每个信道与包括生成的前体光谱水生成前体的光谱,雷达吸收产生的材料前体的光谱,和金属氧化物中的对象相关联的相应的可能的材料特性相关联。 彩色显示可以包括具有按比例respectivement与所接收的前体的光谱相关联的值显示在相应的颜色可能的材料属性的对象的图像。
    • 5. 发明公开
    • Computing radar cross section
    • Berechnung des Radarquerschnitts
    • EP2887092A1
    • 2015-06-24
    • EP13250119.8
    • 2013-12-18
    • BAE SYSTEMS plc
    • The designation of the inventor has not yet been filed
    • G01S7/41G06F17/50
    • G01S7/418G06F17/5018
    • A computer implemented method of computing radar cross-section (RCS) of an object having a fully or partially open cavity is disclosed. The method comprises receiving data representing at least part of the object including the cavity as a mesh comprising a plurality of triangular elements and performing a ray tracing operation on the data to find rays paths in the cavity and exit rays. The method further comprises determining field amplitudes of the exit rays by calculating ray tube divergence factors and planar reflection coefficients, thereby producing a geometrical optics field, which is subsequently used to compute a backscattered field. The calculation of the ray tube divergence factors involve curvature information relating to said mesh which is computed by calculating a Weingarten curvature matrix over each said triangular element. The backscattered field is subsequently used to compute the RCS of at least part of the object represented by the data.
    • 公开了一种计算机实现的具有完全或部分开放空腔的物体的雷达横截面(RCS)的方法。 所述方法包括接收表示包括所述空腔的所述物体的至少一部分的数据作为包括多个三角形元件的网格,并对所述数据执行光线跟踪操作,以在所述空腔和出射光线中找到光线路径。 该方法还包括通过计算射线管发散因子和平面反射系数来确定出射光线的场幅度,由此产生几何光学场,随后用于计算反向散射场。 射线管发散因子的计算涉及与所述网格相关的曲率信息,其通过计算每个所述三角形元素上的Weingarten曲率矩阵来计算。 后向散射场随后用于计算由数据表示的对象的至少一部分的RCS。
    • 7. 发明公开
    • A method and apparatus for precursor based radar
    • 一种用于基于前体雷达性能的方法和装置
    • EP1199580A3
    • 2002-05-15
    • EP01124323.5
    • 2001-10-19
    • Lockheed Martin Corporation
    • Pergande, Al
    • G01S7/41G01S13/02
    • G01S7/03G01S7/282G01S7/41G01S7/418
    • A method and apparatus is described for signal processing to identify an object in an environment. A precursor associated with an electromagnetic wave interacting with the object is received and a property of the object identified using precursor characteristics. The electromagnetic wave is transmitted with a characteristic including a pulse having a sharp rise time so as to generate the precursor. The pulse is generated using a circuit including capacitive discharge and a semiconductor device such as a Drift Step Recovery Diode. Alternatively the pulse may be generated using a microwave diode switch and a broadband semiconductor amplifier or a traveling wave tube amplifier. The characteristic may also includes a signal with a phase reversal generated by dividing the electromagnetic signal and phase modulating the first electromagnetic signal with the divided signal to generate the phase reversal so as to generate the precursor. A receiver may further establish channels corresponding to the possible precursor spectra and associate each channel with a corresponding possible material property associated with the object including water generated precursor spectra, radar absorptive material generated precursor spectra, and metallic oxides generated precursor spectra. A color display may include an image of the object with possible material properties displayed in a corresponding color in proportion to respective values associated with received precursor spectra.