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Design and analysis of a low-loss linear analog phase modulator for deep space spacecraft x-band transponder applications
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Mueller, R. O. Mysoor, N. R. |
| Copyright Year | 1991 |
| Description | This article summarizes the design concepts, analyses, and development of an X-band (8145 MHz) 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. A linear phase deviation of 92 deg with a linearity tolerance of +/- 8 percent was measured for this modulator from 8257 MHz to 8634 MHz over the temperature range -20 to 75 C. The measured insertion loss and the static delay variation with temperature were 2 +/- 0.3 dB and 0.16 psec/ C, respectively. Based on this design, cascaded sections have been modeled, and simulations were performed to provide an X-band deep space transponder (DST) phase modulator with +/- 2.5 radians (+/- 143 deg) of peak phase deviation to accommodate downlink signal modulation with composite telemetry data and ranging, with a deviation linearity tolerance of +/- 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 show excellent agreement with the predicted results. |
| File Size | 14467321 |
| Page Count | 10 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19940025122 |
| Archival Resource Key | ark:/13960/t5x68dh9p |
| Language | English |
| Publisher Date | 1991-05-15 |
| Access Restriction | Open |
| Subject Keyword | Communications And Radar Linear Systems Phase Modulation Varactor Diodes Deep Space Superhigh Frequencies Analog Circuits Telemetry Transponders Phase Deviation Modulators Rangefinding Downlinking Breadboard Models Insertion Loss Space Communication Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
