A flexible coherent digital transceiver architecture has been developed by the APL in order to enable mission specific performance tailoring while maintaining modularity and minimizing program-incurred cost and risk. The new transceiver architecture is based on the heritage X-band transceiver system that is currently integrated into the New Horizons spacecraft. Using this new architecture, a low power, coherent, X-band digital transceiver has been made that meets the requirements for two-way Doppler tracking. The new transceiver contributes less than 0.01 mm/s to the Doppler velocity error measured over a 60-second interval in coherent mode. Secondary power consumption is 2.8 W in the uplink-only mode of operation including the reference oscillator. Transceiver designs on the TIMED, CONTOUR, and New Horizons spacecraft were noncoherent, which required downlink telemetry in order to support two-way Doppler tracking (Jensen, 1999). The addition of a coherent capability allows this new architecture to be used on missions where carrier-only Doppler tracking is desired. This paper provides a description of the new transceiver architecture and its demonstrated performance
[1]
W.P. Millard,et al.
X-band digital receiver for the New Horizons spacecraft
,
2004,
2004 IEEE Aerospace Conference Proceedings (IEEE Cat. No.04TH8720).
[3]
A. Viterbi.
Phase-locked loop dynamics in the presence of noise by Fokker-Planck techniques
,
1963
.
[4]
R.C. Schulze,et al.
The RF telecommunications system for the New Horizons mission to Pluto
,
2004,
2004 IEEE Aerospace Conference Proceedings (IEEE Cat. No.04TH8720).
[5]
M. J. Reinhart,et al.
In-flight contour radiometric performance
,
2003,
2003 IEEE Aerospace Conference Proceedings (Cat. No.03TH8652).
[7]
R. S. Bokulic,et al.
Highly accurate, noncoherent technique for spacecraft Doppler tracking
,
1999
.
[8]
R. S. Bokulic,et al.
Telecommunications system technologies for the near spacecraft
,
1996
.
[9]
R. S. Bokulic,et al.
The Near Spacecraft Telecommunications System
,
1995
.