Spacecraft-spacecraft very long baseline interferometry. Part 1: Error modeling and observable accuracy

Details Spacecraft-spacecraft very long baseline interferometry. Part 1: Error modeling and observable accuracy Spacecraft-spacecraft very long baseline interferometry. Part 1: Error modeling and observable accuracy

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992tdar.nasa...63e&link_type=abstract

In its The Telecommunications and Data Acquisition p 63-76 (SEE N93-19413 06-32)

Other

Error Analysis, Interplanetary Navigation, Orbital Position Estimation, Rangefinding, Spacecraft Tracking, Very Long Base Interferometry, Downlinking, Ionospheres, Radio Signals, Signal To Noise Ratios, Solar Wind, Troposphere

Scientific paper

In Part 1 of this two-part article, an error budget is presented for Earth-based delta differential one-way range (delta DOR) measurements between two spacecraft. Such observations, made between a planetary orbiter (or lander) and another spacecraft approaching that planet, would provide a powerful target-relative angular tracking data type for approach navigation. Accuracies of better than 5 nrad should be possible for a pair of spacecraft with 8.4-GHz downlinks, incorporating 40-MHz DOR tone spacings, while accuracies approaching 1 nrad will be possible if the spacecraft incorporate 32-GHz downlinks with DOR tone spacing on the order of 250 MHz; these accuracies will be available for the last few weeks or months of planetary approach for typical Earth-Mars trajectories. Operational advantages of this data type are discussed, and ground system requirements needed to enable spacecraft-spacecraft delta DOR observations are outlined. This tracking technique could be demonstrated during the final approach phase of the Mars '94 mission, using Mars Observer as the in-orbit reference spacecraft, if the Russian spacecraft includes an 8.4-GHz downlink incorporating DOR tones. Part 2 of this article will present an analysis of predicted targeting accuracy for this scenario.

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