Malte Misfeldt

TL;DR: The Laser Ranging Interferometer (LRI) instrument on the GRACE Follow-On mission has provided the first laser interferometric range measurements between remote spacecraft, separated by approximately 220 km.

TL;DR: The Laser Ranging Interferometer onboard the Gravity Recovery and Climate Experiment Follow-On satellites is the first laser interferometer in space measuring satellite-to-satellite distance variat... as mentioned in this paper.

TL;DR: In this article , the authors show how the phase measurements can be converted into range data using a time-dependent carrier frequency (or wavelength) that takes into account potential intraday variability in the microwave or laser frequency.

TL;DR: In this article , the authors present the current design of the laser interferometer developed by us, the development status of the individual instrument units and the options available, in order to exploit the improved ranging performance, the ESA is investigating the design of a ‘Next Generation Gravity Mission’, consisting of two pairs of satellites with laser interFERometers, improved accelerometers and improved platform performance.

TL;DR: In this paper , the authors derived formulas for precisely performing the conversion from the phase measurement into a range, accounting for a varying carrier frequency, and the dominant errors due to knowledge uncertainty of the carrier frequency as well as uncorrected time biases are derived.