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作者在十几年前研制了一种新型的圆锥扫描跟踪天线馈源(RADSCAN)。它只有一个可移动零件,并且具有很高的可靠性。尽管这种系统在多方面优于单通道单脉冲系系(SCM),但它还有两个缺点:一是由于采用驱动电机,使得重量较大;二是扫描速度是固定不变的。EMP 公司已研制成气体驱动扫描跟踪馈源,(Pneu-Scan),从而新产品不再使用沉重的驱动电机。由于环境上的原因,大多数遥测跟踪天线需要带烘干机增压装置。烘干机所提供的压缩空气可以直接用来驱动馈源。所以不需要外加驱动装置。此外,扫描速度和压力变化成正比。如果需要提高可靠性,那么可使用多个烘干机。馈源只有一个可移动的零件,它由不到一盎司的碳纤维构成,整个馈源由一个小而轻的涡轮驱动。这种 S 波段跟踪馈源的直径不到5英寸,而单通道单脉冲馈源直径却达12英寸。同时,这种馈源还比单通道单脉冲馈源轻得多。口径遮挡减少2倍以上,可使旁瓣减少,并使增益达到最大值新馈源照射一个直径为5英尺的轻型碳环氧树脂制的抛物面天线,该天线固定在方位俯仰基座上。方位俯仰基座的部件是由碳纤维合成材料制成的,与普通的钢、铝结构相比,它的重量和成本都大为减少。俯仰部件装在一个可充气的半球形罩(简称球罩)中,球罩可沿方位旋转。球罩能使风载荷所引起的阻力减至最小程度,从而大大减少所需的驱动电机的功率。整个系统的重量小于135磅,它是一种全新的超轻型低造价多用途双轴遥测跟踪系统。
A dozen years ago, the authors developed a new type of Cone Scanning Antenna Feed (RADSCAN). It has only one movable part and is highly reliable. Although this system outperforms single-channel single-pulse systems (SCMs) in many ways, it has two disadvantages: First, the weight is increased due to the use of a drive motor; second, the scanning speed is constant. EMP has developed the Pneu-Scan, a gas driven scanning track feed, so new products no longer use heavy-duty drive motors. For environmental reasons, most telemetry tracking antennas require a dryer pressure booster. The compressed air provided by the dryer can be used directly to drive the feed. Therefore, no additional drive is required. In addition, the scanning speed is proportional to the pressure change. If you need to improve reliability, then you can use more than one dryer. The feed has only one moveable part, which consists of less than an ounce of carbon fiber and the entire feed is driven by a small, lightweight turbine. This S-band tracking feed is less than 5 inches in diameter, while a single-channel, single-pulse feed is up to 12 inches in diameter. At the same time, this feed is also much lighter than a single-channel, single-pulse feed. Reduce side-lobe and maximize gain by doubling the aperture blockage New feed illuminates a 5-foot-diameter, light-weight, carbon epoxy parabolic antenna that is mounted on an azimuth pitch base. Azimuth Pitch The base of the unit is made of carbon fiber composite material, and its weight and cost are greatly reduced compared to conventional steel and aluminum structures. The pitch unit is housed in an inflatable hemispherical dome (ball cage) that rotates in azimuth. The dome shield minimizes the drag caused by the wind load, greatly reducing the power required to drive the motor. The entire system, weighing less than 135 pounds, is a new ultralight, low-cost, multipurpose two-axis telemetry tracking system.