Goto Section: 15.501 | 15.505 | Table of Contents
Revised as of September 1, 2021
Goto Year:2020 |
§ 15.503 Definitions.
(a) UWB bandwidth. For the purpose of this subpart, the UWB bandwidth
is the frequency band bounded by the points that are 10 dB below the
highest radiated emission, as based on the complete transmission system
including the antenna. The upper boundary is designated fH and the
lower boundary is designated fL. The frequency at which the highest
radiated emission occurs is designated fM.
(b) Center frequency. The center frequency, fC, equals (fH + fL)/2.
(c) Fractional bandwidth. The fractional bandwidth equals 2(fH−fL)/ (fH
(d) Ultra-wideband (UWB) transmitter. An intentional radiator that, at
any point in time, has a fractional bandwidth equal to or greater than
0.20 or has a UWB bandwidth equal to or greater than 500 MHz,
regardless of the fractional bandwidth.
(e) Imaging system. A general category consisting of ground penetrating
radar systems, medical imaging systems, wall imaging systems
through-wall imaging systems and surveillance systems. As used in this
subpart, imaging systems do not include systems designed to detect the
location of tags or systems used to transfer voice or data information.
(f) Ground penetrating radar (GPR) system. A field disturbance sensor
that is designed to operate only when in contact with, or within one
meter of, the ground for the purpose of detecting or obtaining the
images of buried objects or determining the physical properties within
the ground. The energy from the GPR is intentionally directed down into
the ground for this purpose.
(g) Medical imaging system. A field disturbance sensor that is designed
to detect the location or movement of objects within the body of a
person or animal.
(h) Wall imaging system. A field disturbance sensor that is designed to
detect the location of objects contained within a “wall” or to
determine the physical properties within the “wall.” The “wall” is a
concrete structure, the side of a bridge, the wall of a mine or another
physical structure that is dense enough and thick enough to absorb the
majority of the signal transmitted by the imaging system. This category
of equipment does not include products such as “stud locators” that are
designed to locate objects behind gypsum, plaster or similar walls that
are not capable of absorbing the transmitted signal.
(i) Through-wall imaging system. A field disturbance sensor that is
designed to detect the location or movement of persons or objects that
are located on the other side of an opaque structure such as a wall or
a ceiling. This category of equipment may include products such as
“stud locators” that are designed to locate objects behind gypsum,
plaster or similar walls that are not thick enough or dense enough to
absorb the transmitted signal.
(j) Surveillance system. A field disturbance sensor used to establish a
stationary RF perimeter field that is used for security purposes to
detect the intrusion of persons or objects.
(k) EIRP. Equivalent isotropically radiated power, i.e., the product of
the power supplied to the antenna and the antenna gain in a given
direction relative to an isotropic antenna. The EIRP, in terms of dBm,
can be converted to a field strength, in dBuV/m at 3 meters, by adding
95.2. As used in this subpart, EIRP refers to the highest signal
strength measured in any direction and at any frequency from the UWB
device, as tested in accordance with the procedures specified in
§ 15.31(a) and 15.523 of this chapter.
(l) Law enforcement, fire and emergency rescue organizations. As used
in this subpart, this refers to those parties eligible to obtain a
license from the FCC under the eligibility requirements specified in
§ 90.20(a)(1) of this chapter.
(m) Hand held. As used in this subpart, a hand held device is a
portable device, such as a lap top computer or a PDA, that is primarily
hand held while being operated and that does not employ a fixed
Goto Section: 15.501 | 15.505
Goto Year: 2020 |
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