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StreamPro ADCP Operation Manualcommon for bottom tracking measurements to lock onto a sediment layerthat is still moving, resulting in a bias to the bottom tracking velocity. Thisis especially important for river discharge measurements, where the vessel’snavigation must be substituted for the bottom track velocity to obtain accurateresults.------ N ------Navigator: Model name for the TRDI Doppler Velocity Log.Narrowband ADCP: An ADCP that uses narrowband processing.Narrowband Processing: Uses a single pulse per ping to measure velocity.The lack of coding in the pulse makes a narrowband measurement muchless precise, but it allows profiling over a longer range. Narrowband processinggenerally requires much larger ensembles to get a precise measurement.------ O ------Ocean Observer: Low frequency Phased Array ADCP for cabled deployment,usually from an oilrig.Ocean Surveyor: Low frequency Phased Array ADCP for vessel-mountedoperations.------ P ------Percent Good: A key quality control parameter, percent good indicateswhat fraction of the pings passed the various error thresholds. Each depthcell reports four values for percent good, and the meaning depends on thecoordinate frame. If data is collected in beam coordinates, then the fourpercent good values represent the percentage of the pings collected by eachbeam for that depth cell whose correlation exceeded a low correlationthreshold. In the other coordinate frames (ADCP, Ship and Earth Coordinates),the four Percent Good values represent (in order): 1) The percentageof good three beam solutions (one beam rejected); 2) The percentage ofgood transformations (error velocity threshold not exceeded); 3) The percentageof measurements where more than one beam was bad; and 4) Thepercentage of measurements with four beam solutions.Phase: An engineering measure of the propagation delay caused by radialmotion between scatterer and source. Phase is ambiguous in that it is cyclical(e.g. 10 º is the same phase as 370 º).Phased Array Transducer: A single, flat, multi-element transducer thatuses a TRDI proprietary technique to simultaneously form all four beams.Available phased array transducers are generally low frequency (38 kHz, 75kHz and 150 kHz) long range devices.page 106Teledyne RD Instruments
StreamPro ADCP Operation ManualPing: The entirety of the sound generated by an ADCP transducer for a singlemeasurement cycle. A broadband ping contains a coded series of pulsesand lags, while a narrowband ping contains a single pulse.Ping Mode: Power conserving mode for a deployed ADCP or DVL, whereonly the power needed for the immediate deployment task is drawn (as opposedto command mode, where the ADCP consumes considerable powerwhile simply waiting for input). This mode saves the deployment configurationso that, in the event of a power interruption, the ADCP or DVL willbe able to automatically resume the configured deployment upon return ofpower.PlanADCP: Windows-based software package allowing the user to configure,and evaluate the consequences of, a deployment command-set for anADCP.Profile: A series of regularly spaced depth cells in which the ADCP measuresvelocity along with several quality control parameters.Pulse: A sound wave generated by a transducer.Propagation Delay: The change in the travel time of sound between asource and scatterer, generally due to radial motion. As an example: if ittakes longer for sound to reflect back from a scatterer than it did a shortwhile ago (and the speed of sound has not changed), then the scatterer mustbe getting farther away.------ Q ------Quartermaster: The model name for a self-contained 150kHz WorkhorseADCP.------ R ------Radial Motion: Movement which alters the distance between source andscatterer.Range: The maximum profile length of an ADCP, it depends on several factors(note that these factors are inter-related in a complex way, and the generalizationsbelow are intended only as rules of thumb – use PlanADCP tocheck specific combinations):1. Frequency: the lower the frequency, the longer the range.2. Depth cell size: the larger the cell, the longer the range.3. Mode of operation: mode 1 has the longest range.4. Bandwidth: the narrower the bandwidth, the longer the range.5. Concentration of scatterers: generally, the more scatterers,the longer the range.P/N 95B-6003-00 (February 2008) page 107
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