摘要:
By using two SAR antennas spaced a known distance, B, and oriented at substantially the same look angle to illuminate the same target area, pixel data from the two antennas may be compared in phase to determine a difference .DELTA..phi. from which a slant angle .theta. is determined for each pixel point from an equation .DELTA..phi.=(2.pi.B/.lambda.)sin(.theta.-.alpha.), where .lambda. is the radar wavelength and .alpha. is the roll angle of the aircraft. The height, h, of each pixel point from the aircraft is determined from the equation h=R cos .theta., and from the known altitude, a, of the aircraft above sea level, the altitude (elevation), a', of each point is determined from the difference a-h. This elevation data may be displayed with the SAR image by, for example, quantizing the elevation at increments of 100 feet starting at sea level, and color coding pixels of the same quantized elevation. The distance, d, of each pixel from the ground track of the aircraft used for the display may be determined more accurately from the equation d=R sin .theta..
摘要翻译:通过使用间隔已知距离B的两个SAR天线,并以基本相同的视角定向以照射相同的目标区域,可以相位地比较来自两个天线的像素数据,以确定偏斜角θ 根据方程DELTA phi =(2 pi B / lambda)sin(θ-α)为每个像素点确定,其中λ是雷达波长,α是飞机的侧倾角。 从飞行器的每个像素点的高度h从方程h = Rcosθ和从海平面以上的飞行器的已知高度a,每个点的高度(高度),a' 是从差异决定的啊。 该高程数据可以通过例如以海平面开始以100英尺的增量量化海拔的高程和相同量化高程的颜色编码像素来显示SAR图像。 来自用于显示器的飞行器的地面轨道的每个像素的距离d可以从等式d = Rsinθ更准确地确定。
摘要:
A coaxial switch capable of operating in a vacuum with high RF power in the 1.2 GHz range without "multipactor" breakdown, and without relying on pressurization with an inert gas, which requires a hermetic seal, is achieved by completely surrounding the RF carrying conductors of the switch with a high grade solid dielectric, thus eliminating any gaps in which electrons can accelerate.
摘要:
A coaxial cable connector is provided, which resists radio-frequency breakdown in coaxial cables used in the vacuum of outer space. The connector body surrounds an insulator which includes an easily compressible elastomeric portion. An insulated coaxial cable is prepared so its insulation projects beyond the outer conductor and compresses the elastomeric portion of the connector insulator.