NDLI: Design of high performance TWT based C-Band transmitter for high altitude operation

Content Provider	IEEE Xplore Digital Library
Author	Kumar, D. Sushma, B.R. Prabhu, V. Das, M. Saha, N.C.
Copyright Year	2011
Description	Author affiliation: LRDE, C.V. Raman Nagar, Bangalore-560 093, India (Kumar, D.; Sushma, B.R.; Prabhu, V.; Das, M.; Saha, N.C.)
Abstract	This paper presents the design issues and challenges in the realization of high performance Traveling Wave Tube (TWT) based Transmitter for Weapon Locating Radar for the detection of targets having very small RCS viz. mortar shell, gun shells etc and to locate the origin of the weapon. The design goal was to achieve stable operation of the transmitter having spectrum purity of near carrier noise of −75dBc/Hz at 100 Hz away from the carrier while delivering 60 kW (minimum) of peak power and 3 kW of average power across the bandwidth of 500MHz at C-Band. These requirements translates into High Voltage Power Supply (HVPS) design, i.e., Cathode Power Supply −39 kVDC, 6.0 kW and Collector power supply 30 kVDC, 16.5 kW with stringent pulse to pulse regulation of the order of 0.0004% under adverse environmental conditions viz. reliable operation of high voltage power supplies under 16500 ft operating conditions. The realization of critical units, specific high voltage engineering to enhance the reliability is discussed in addition to design of the transmitter. High voltage power supply design issues, Control and protection strategy of the transmitter and the realization of a fast solid state FDM (Floating Deck Grid Modulator) has been discussed. The development & testing of transmitter has been completed. The test results & simulation results have been presented in this paper. Generally bulk energy storage capacitors are used to meet RF amplitude flatness requirements of the transmitter. The energy stored in these capacitors is typically of the order of 600 to 800 joules. TWT in general can handle energy of the order of 50 joules during arcing without causing permanent damage to the tube. Hence the effective energy diversion mechanism is required. The detailed analysis and protection employed have also been discussed in this paper.
Starting Page	429
Ending Page	430
File Size	91721
Page Count	2
File Format	PDF
ISBN	9781424486625
e-ISBN	9781424486618
DOI	10.1109/IVEC.2011.5747059
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-02-21
Publisher Place	India
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Transmitters Electron tubes Power supplies Electric breakdown Electrodes Frequency division multiplexing Stress Arc energy TWT FDM Near carrier Noise Breakdown strength
Content Type	Text
Resource Type	Article

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