Incoherent multibeam Doppler current profiler performance: Part II--Spatial response

摘要: We consider the spatial response and sampling properties of ship-mounted four-beam three-beam incoherent Doppler current profilers. Spatial are an issue because such systems cannot make a point measurement field, actual field is nonuniform. obtain expressions for effect beamwidth, beam separation, block averaging on system response. observe that aliasing may occur above some critical depth, pulsewidth reduction improve vertical resolution beyond limit imposed by geometry. also find that, system, along-track component irrevocably contaminated (to degree) cross-track as result its nonorthogonal The velocity shear estimate variances achievable with these calculated in companion paper [1].