def METHOD_NAME(LP_solver="pyglpk"):
    """Perform LP phase processing on a single ray radar."""
    radar = pyart.testing.make_single_ray_radar()
    my_gatefilter = pyart.filters.GateFilter(radar)
    my_gatefilter.exclude_below("normalized_coherent_power", 0.5)
    my_gatefilter.exclude_below("cross_correlation_ratio", 0.8)
    phidp, kdp = pyart.correct.phase_proc_lp_gf(
        radar,
        gatefilter=my_gatefilter,
        LP_solver=LP_solver,
        doc=15,
        ncpts=20,
        system_phase=-140.1,
    )
    return radar, phidp, kdp