一种新的BMEWS发射机调制器设计

M. Grimes, M. Grothaus, W. North, D. Brittain, R. Norander, D. Kajonpong
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引用次数: 0

摘要

弹道导弹预警系统(BMEWS)是在1950年代末和1960年代初设计和建造的一个系列雷达。最初,有三个BMEWS站点:格陵兰岛的图勒;清楚,阿拉斯加;和英国的费林斯代尔。目前,只剩下阿拉斯加的克利尔(Clear)一个发射场,仍在使用18台原始设计的发射机。每个发射机使用一对调制阳极速调管,在425 MHz时提供2.5 MW的联合峰值输出,在27 pps时提供2 ms脉冲。自该场址开始运作以来的30年里,对发射机进行的修改很少。维修设备所需的许多部件现在很难获得,而且成本过高。西南研究院对发射机末级功率放大器的脉冲调制器进行了重新设计。重新设计的脉冲调制器工作在-120千伏,采用浮动甲板配置,是原始装置的形式和功能替代品。设计思路包括:(1)减小浮动机箱尺寸,减小自容,降低开关管功耗;(2)保持支持电路简单,减少故障,便于维护;(3)使用传统部件使电子设备在未来许多年都可以使用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A new modulator design for the BMEWS transmitter
The Ballistic Missile Early Warning System (BMEWS) is a family of radars that was designed and built in the late 1950s and early 1960s. Originally, there were three BMEWS sites: Thule, Greenland; Clear, Alaska; and Fylingsdale, England. Currently, there is only one remaining site, at Clear, Alaska, that still uses eighteen of the original design transmitters. Each transmitter uses a pair of modulating-anode klystrons which provide a combined peak output of 2.5 MW at 425 MHz with 2 ms pulses at 27 pps. Very few modifications have been implemented on the transmitters in the thirty years since the site became operational. Many of the parts required to service the equipment are now difficult to obtain and cost prohibitive. Southwest Research Institute (SwRI) has redesigned the pulse modulator for the transmitter final-stage power amplifier. The redesigned pulse modulator operates at -120 kV, uses a floating deck configuration, and is a form-fit-and-function replacement for the original unit. The design approach included: (1) minimizing the size of the floating chassis to reduce self-capacitance for reduced switch-tube power dissipation; (2) keeping support circuitry simple for fewer failures and ease of maintenance; and (3) using conventional parts to make the electronics supportable for many years to come.
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