ETSI
draft ETSI EN 303 396 V1.1.1 (2016
boresight: direction of maximum gain of a directional antenna
NOTE: EUT may have different boresights for TX and RX antennas.
bumper: (automotive) generally 3D shaped plastic sheet normally mounted in front of the radar device
co-located receiver: receiver is located in the same device housing as the transmitter
cycle time: length of the time between periodic transmission patterns of the system
NOTE: In case of a random pattern, a default value of 1 minute is used.
duty cycle:
∑
(
)/
_
where T
on
is the ON time of a single transmission and t_o is the observation period. T
on
is
measured in an observation frequency band (BW_o)
dwell time: in general, time interval for which a certain frequency range is occupied
NOTE: "Cumulated dwell time" is the sum of individual dwell times within a measurement time frame and in a
defined frequency range.
"Absolute dwell time" is the time from first entrance into a defined frequency range until last exit from a
defined frequency range.
Equipment Under Test (EUT): radar sensor including the integrated antenna together with any external antenna
components which affect or influence its performance
equivalent isotropically radiated power (e.i.r.p.): product of the power supplied to the antenna and the antenna gain
in a given direction relative to an isotropic antenna (absolute or isotropic gain)
NOTE 1: See ITU Radio Regulations [i.2], RR 1.161.
NOTE 2: e.i.r.p. may be used for peak or mean (average) power and peak or mean (average) spectral power density.
If not otherwise noted, e.i.r.p. refers to the mean (average) power.
far field measurement: measurement at a distance from an antenna sufficient to ensure that the electro-magnetic field
approximates a plane wave (see clause 5.3.2.3)
illumination time: (for equipment with scanning antennas) time for which a given point in the far field is within the
main beam(s) of the antenna(s)
maximum power: maximum mean power with respect to azimuth and elevation (typically measured at antenna
boresight)
mean power: power during an interval of time sufficiently long compared with the lowest frequency encountered in the
modulation envelope
NOTE 1: See ITU Radio Regulations [i.2], RR 1.158.
NOTE 2: For pulsed systems the mean power is equal to the peak envelope power (see ITU Radio Regulations [i.2],
RR 1.157) multiplied by the time gating duty factor. For CW systems without time gating the mean power
is equal to the transmission power without modulation.
operating frequency (operating centre frequency): nominal frequency at which equipment is operated
NOTE: Equipment may be able to operate at more than one operating frequency.
operating frequency range: range of operating frequencies over which the equipment can be adjusted through
switching or reprogramming or oscillator tuning
NOTE 1: For pulsed or phase shifting systems without further carrier tuning the operating frequency range is fixed
on a single carrier line.
NOTE 2: For analogue or discrete frequency modulated systems (FSK, FMCW) the operating frequency range
covers the difference between minimum and maximum of all carrier frequencies on which the equipment
can be adjusted.
peak power: highest instantaneous power of the EUT