def METHOD_NAME(self) -> xr.Dataset:
    # TODO: add mock data
    ds = xr.Dataset()
    # Assemble sonar group global attribute dictionary
    sonar_attr_dict = {
        "sonar_manufacturer": "Simrad",
        "sonar_model": self.sonar_model,
        # transducer (sonar) serial number is not stored in the EK60 raw data file,
        # so sonar_serial_number can't be populated from the raw datagrams
        "sonar_serial_number": "",
        "sonar_software_name": "",
        "sonar_software_version": "0.1.0",
        "sonar_type": "echosounder",
    }
    ds = ds.assign_attrs(sonar_attr_dict)
    return ds