Flight Phasemeter on the Laser Ranging Interferometer on the GRACE Follow-On Mission An inter-spacecraft laser interferometry technology demonstrator with similarities to LISA Kirk McKenzie and William Klipstein, GRACE-FO

for the LRI Team NASA’s Jet Propulsion Laboratory, California Institute of Technology

LRI Management LRI implementation

LISA Symposium, 5 September 2016

The technical data in this document is controlled under the U.S. Export Regulations; release to foreign persons may require an export authorization. mage from http://www.csr.utexas.edu/grace/

Gravity-Sensing: Precision Phase Measurement Instruments in Space Microwave Instrument ~ Micrometer Precision Gravity Recovery and Climate Experiment (GRACE), Earth Science, microwave measurements (micrometers) 2002-present. Gravity Recovery and Interior Laboratory (GRAIL), Planetary science, microwave measurements (micrometers) Sept 10, 2011 – Dec 17, 2012

Laser Instrument ~ Nanometer to Picometer Precision Laser Interferometer Space Antenna (LISA) Astrophysics, (picometers) -> ESA Cosmic Visions L3 (c. 2030)

1"#"$%!"'"

!"#"$ & % "' "

()*+,"-./0"

GRACE Follow-On Laser Interferometer Space Antenna Earth Science, !"#$%&'( )''*+&',-./'0"11"23'$1&1'451&%'"36&%7&%20&6%8'5023#'6+%&&'9%5#:7%&&' Microwave (micrometers), Laser 1;5