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This book fulfills the needs of engineers and technicians who specify, procure, design, develop, test, manufacture, operate and service tubes, power supply/modulators and complete transmitters for radar, ECM and communications and broadcast systems. The material in the book is also applicable to microwave transmitters for scientific applications.
Weather radar is a vital instrument for observing the atmosphere to help provide weather forecasts and issue weather warnings to the public. The current Next Generation Weather Radar (NEXRAD) system provides Doppler radar coverage to most regions of the United States (NRC, 1995). This network was designed in the mid 1980s and deployed in the 1990s as part of the National Weather Service (NWS) modernization (NRC, 1999). Since the initial design phase of the NEXRAD program, considerable advances have been made in radar technologies and in the use of weather radar for monitoring and prediction. The development of new technologies provides the motivation for appraising the status of the current weather radar system and identifying the most promising approaches for the development of its eventual replacement. The charge to the committee was to determine the state of knowledge regarding ground-based weather surveillance radar technology and identify the most promising approaches for the design of the replacement for the present Doppler Weather Radar. This report presents a first look at potential approaches for future upgrades to or replacements of the current weather radar system. The need, and schedule, for replacing the current system has not been established, but the committee used the briefings and deliberations to assess how the current system satisfies the current and emerging needs of the operational and research communities and identified potential system upgrades for providing improved weather forecasts and warnings. The time scale for any total replacement of the system (20- to 30-year time horizon) precluded detailed investigation of the designs and cost structures associated with any new weather radar system. The committee instead noted technologies that could provide improvements over the capabilities of the evolving NEXRAD system and recommends more detailed investigation and evaluation of several of these technologies. In the course of its deliberations, the committee developed a sense that the processes by which the eventual replacement radar system is developed and deployed could be as significant as the specific technologies adopted. Consequently, some of the committee's recommendations deal with such procedural issues.
The object of this program was to develop a solid state transmitter module with a peak power of 200 watts and a projected design for a broadside array using these modules. The approach selected was to parallel sixteen RCA Type TA2675 overlay transistors in parallel and combining their power outputs by means of strip transmission line hybrid junctions to a radiating element integral with the module. The experimental model delivered a peak power output of 272 watts at 432 MHz and when operated at the 200 watt level had an output variation of less than 1.5db over a 20 MHz band. The prime advantage of the solid state module is the elimination of the requirement for a modulator, since the transistor amplifiers are designed to draw negligible current in the absence of r.f. drive power, they can be operated from an unswitched power source. (Author).
Annotation The first volume in a new series. Contributed papers give a theory of radar signal processing at a level accessible and useful to practicing radar engineers concerned with design and analysis. No index. Annotation(c) 2003 Book News, Inc., Portland, OR (booknews.com)
This program was for the design, construction and test of two Solid State Grid Modulators to provide enhanced performance and improved reliability in existing S-band radar transmitters at the Rome Research Site. Specifically, the modulators support the pulse widths and PRF's necessary to mimic the waveforms of any AN/APY-2 AWACS radar transmitter. These include a mixture of long-pulse, low-PRF and short-pulse, high PRF modes which could not be supported by the transmitters' original grid modulators. The modulators were delivered and tested at Rome Research Site.