INO: Interplanetary Network of Optical Lattice Clocks

Understand

The new technique of measuring frequency by optical lattice clocks now approaches to the relative precision of $(\Delta f/f)=O(10^{-18})$.

• We propose to place such precise clocks in space and to use Doppler tracking method for detecting low-frequency gravitational wave below 1 Hz.
• Our idea is to locate three spacecrafts at one A.U.
• distance (say at L1, L4 & L5 of the Sun-Earth orbit), and apply the Doppler tracking method by communicating "the time" each other.