compute_TS

echopype.calibrate.compute_TSechodata: EchoData**kwargs

Compute target strength (TS) from raw data.

The calibration routine varies depending on the sonar type. Currently this operation is supported for the following sonar_model: EK60, AZFP, EK80 (see Notes below for detail).

ParametersReturns
Notes

The EK80 echosounder can be configured to transmit either broadband (waveform_mode="BB") or narrowband (waveform_mode="CW") signals. When transmitting in broadband mode, the returned echoes are encoded as complex samples (encode_mode="complex"). When transmitting in narrowband mode, the returned echoes can be encoded either as complex samples (encode_mode="complex") or as power/angle combinations (encode_mode="power") in a format similar to those recorded by EK60 echosounders.

The current calibration implemented for EK80 broadband complex data uses band-integrated TS with the gain computed at the center frequency of the transmit signal.

Note that in the fisheries acoustics context, it is customary to associate TS to a single scatterer. TS is defined as: TS = 10 * np.log10 (sigma_bs), where sigma_bs is the backscattering cross-section.

For details, see: MacLennan et al. 2002. A consistent approach to definitions and symbols in fisheries acoustics. ICES J. Mar. Sci. 59: 365-369. https://doi.org/10.1006/jmsc.2001.1158