Interferer Number of Frequency Modulation/chirp Chirp duration interferers bandwidth I1 (CW) 1 f no no I2 (FMCW fast) 1 From f OBW 50µs – 0.5*OWB to f + 0.5*OWB I3 (multi interferer, CW 2 f no No simultaneously) FMCW fast From f OBW 50µs – 0.5*OWB to f + 0.5*OWB I4 (noise) 1 From f 0.5*F F – to f + 0.5*F OBW: occupied bandwidth Comments: Modulated interferer signal does not give constant interference. To get stable results a long measurement time • might be needed. Action: Interferer FMCW details to be defined. • 55mV/m is equal to an 10dBm (e.i.r.p) interferer in 10m distance • CW interferer for Comment: Interferer: CW as current EN version 173mV/m is equal to an 20dBm (e.i.r.p) interferer in 10m distance F= permitted operating bandwidth. Annex D (normative or informative): Interference test setup with conventional RCS within chamber reflector within for long measuring distances are not possible within a certified “corner chamber” Therefore test environment (chamber), then corner reflector (RCS) / distance could be scaled down (within a chamber). Note or we provide the RCS/chamber test only for short distance because a scalling to to e.g. corner reflector with a dimension of 1cm is not practical ?
Interferer Number of interferers Frequency Modulation/chirp bandwidth Chirp duration I1 (CW) 1 f no no I2 (FMCW fast) 1 From f – 0.5*OWB to f + 0.5*OWB OBW 50µs I3 (multi interferer, simultaneously) CW 2 f no No FMCW fast From f – 0.5*OWB to f + 0.5*OWB OBW 50µs I4 (noise) 1 From f – 0.5*F to f + 0.5*F F OBW: occupied bandwidth Comments: • Modulated interferer signal does not give constant interference. To get stable results a long measurement time might be needed. • Action: Interferer FMCW details to be defined. • 55mV/m is equal to an 10dBm (e.i.r.p) interferer in 10m distance CW interferer for Comment: Interferer: CW as current EN version 173mV/m is equal to an 20dBm (e.i.r.p) interferer in 10m distance F= permitted operating bandwidth. Annex D (normative or informative): Interference test setup with conventional RCS within chamber “corner reflector within chamber” Therefore for long measuring distances are not possible within a certified test environment (chamber), then corner reflector (RCS) / distance could be scaled down (within a chamber). Note or we provide the RCS/chamber test only for short distance because a scalling to to e.g. corner reflector with a dimension of 1cm is not practical ?
ERM-TGSRR-79v111_002.docx