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  • SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING  (2)
  • 1990-1994  (2)
  • 1
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    Performance results of a 300-deg linear phase modulator for spaceborne communications applications (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A phase modulator capable of large linear phase deviation, low loss, and wide band operation with good thermal stability was developed for deep space spacecraft transponder (DST) applications at X-band (8.415 GHz) and Ka-band (32 GHz) downlinks. The design uses a two-stage circulator-coupled reflection phase shifter with constant gamma hyperabrupt varactors and an efficient modulator driver circuit to obtain a phase deviation of +/- 2.5 rad with better than 8 percent linearity. The measured insertion loss is 6.6 dB +/- 0.35 dB at 8415 MHz. Measured carrier and relative sideband amplitudes resulting from phase modulation by sine wave and square modulating functions agree well with the predicted results.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: In: 1993 IEEE Aerospace Applications Conference, 14th, Steamboat Springs, CO, Jan. 31-Feb. 5, 1993, Digest (A93-53626 23-17); p. 43-52.
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Design and analysis of low-loss linear analog phase modulator for deep space spacecraft X-band transponder (DST) application (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper summarizes the design concepts, analyses, and the development of an X-band transponder low-loss linear phase modulator for deep space spacecraft applications. A single section breadboard circulator-coupled reflection phase modulator has been analyzed, fabricated, and evaluated. Two- and three-cascaded sections have been modeled and simulations performed to provide an X-band DST phase modulator with +/- 2.5 radians of peak phase deviation to accommodate down-link signal modulation with composite telemetry data and ranging with a deviation linearity tolerance +/- 8 percent and insertion loss of less than 10 +/- 0.5 dB. A two-section phase modulator using constant gamma hyperabrupt varactors and an efficient modulator driver circuit was breadboarded. The measured results satisfy the DST phase modulator requirements, and excellent agreement with the predicted results.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: 1991 IEEE Aerospace Applications Conference; Feb 03, 1991 - Feb 08, 1991; Crested Butte, CO; United States
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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