Bill Woods wrote: But they can get ranges of objects with wedges directly, from gravitic(?) sensors. We've seen people routinely spoofing the strength of the signal and thus the type of ship making it, but not the ship's location. And they can calibrate those sensors every time a ship drops out of hyper, since that has to happen outside the hyper limit.
In real life it's possible to get a rough estimation of the distance of a signal source through analysis of the strength of the signal, but it's ONLY an estimate and may be off by a considerable margin ("confidence" low, medium, high or "Captain, our antennas are being fried!")
I think a single starship getting a "fix" (range and distance) on a grav point source like a wedge using only the ship's passive sensors is probably a little bit of "hand wavium" on RFC's part. But it is his universe and subject to the laws of physics that he lays out.
I would suspect that the sensor antennas on our starship are laid out much like the hydro-acoustic sensors on a 21st century submarine, all along the length of the hull and along a cable that can be extended and retracted from the rear of the ship, thus providing a bit of a baseline where two or more sensors can make up a small "net" and provide some DF location fixing capability.
Read Tom Clancy's Submarine, his explanations are actually pretty good and got him into trouble (again) with the Navy.