Quote:
|
Originally Posted by Amizaur
What is bearing scatter ? Has it something to do with sound wave scattering and arriving to receiver from different bearings or is it something freq related ? And second (related?) question, what is angular resolution of a towed array for such low freqs (1-10Hz), can you get exact bearing of such signal - like for higher freqs, or maybe only it's general direction +/- 30 deg for example ? I'm not sure how precisely can be measured bearing of signal that has wave lenght comparable to towed array size... :hmm: Even if it arrives from the side...
|
Second question (degree of bearing error) I can't answer. Sorry. It depends on the individual towed array and relative bearing of the contact anyway.
As for definition of bearing scatter? That is just as it sounds: inaccurate bearings. Especially near certain areas of a towed array the bearings sent from narrowband trackers can be extremely inaccurate. If you plot them on a Time/Bearing plot they are more of a radnom zigzag pattern than a straight line. Lower frequencies are notorious for this. Bearings from these frequencies are very unreliable, which is why long-range tracking is such a game of patience. Oftentimes when you have one faint tonal and track it for a very long period of time, you depend on trends, patterns, and guesses based on range rate more than the real-time solutions based on bearing rate that we model in the game.
Bearing rate tracking = broadband trackers and LF narrowband
Range rate tracking = VLF narrowband trackers
That oversimplifies it, but it's close to reality. With VLF, bearing rate is often just a SWAG.