There are two ways you can modulate waves: by amplitude or by frequency.
when you measure changes in gravity, then you are measuring a wave in the gravity (by definition, a wave is deltas over time)
so, all waves travel in some kind of field.
as gravity is the curvature of space over time, spacetime is the gravity field.
so titor, in effect is measuring spacetime curvature
Einstein’s relativity links motion to gravity. as speed increases, so does the mass of the moving object, and therefore it’s gravity.
therefore, to get any meaningful measurement of gravity, you also have to measure velocity - because it changes the curvature.
now, consider the difference between AM and FM radio.
If gravity waves behave like AM radio, then the wave looses information as it fluctates in amplitude. you can clip or flatten the profile.
if gravity waves behave like FM radio, then information is not lost as the wave fluctuates in amplitude.
that’s why music sounds better, crisper, and cleaner on FM than it does on AM.
FM radios work be comparing differences in frequency over a baseline frequency. the baseline is the average of the shifting frequencies. a special circuit, called a phase locked loop in the FM radio dies this averaging all the time, and it extracts the deltas from the baseline frequency to reproduce the signal. This circuit is often implemented on its own IC chip. the chip is called a phase locked loop (PLL).
VGL sounds like a gravity version of this