Not sure - I'm doing some leg work on the internet looking, but the sources I'm finding aren't something I necessarily would trust.

Radar of course uses the same principle to measure the distance to a target. If the distance to the target were known, then you could use your radar essentially as a clock: the time it takes to emit a radar pulse and then for it to return could be calibrated based on the known distance and speed of light. However, you would not be able to make a time dilation-immune clock this way on a relativistic space ship because the space ship would experience Lorentz Contraction, which would change the distance between the radar emitter and the target, so they aren't known anymore.