ITU-R SM 1755-2006 Characteristics of ultra-wideband technology《超带宽技术特点》.pdf
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1、 Rec. ITU-R SM.1755 1 RECOMMENDATION ITU-R SM.1755 Characteristics of ultra-wideband technology (Questions ITU-R 226/1 and ITU-R 227/1) (2006) Scope Information on technical and operational characteristics of UWB devices is needed to study the impact of these devices on other radiocommunication serv
2、ices. This Recommendation is giving the list of terms and definitions as well as general characteristics of UWB technology. The ITU Radiocommunication Assembly, considering a) that intentional transmissions from devices using ultra-wideband (UWB) technology may extend over a very large frequency ran
3、ge; b) that devices using UWB technology are being developed with transmissions that span numerous radiocommunication service allocations; c) that devices using UWB technology may therefore impact, simultaneously, many systems operating within a number of radiocommunication services, including those
4、 which are used internationally; d) that UWB technology may be integrated into many applications such as short-range indoor and outdoor communications, radar imaging, medical imaging, asset tracking, surveillance, vehicular radar and intelligent transportation; e) that it may be difficult to disting
5、uish UWB transmissions from emissions or unintentional radiations in equipment that also contains other technologies, where different limits may apply; f) that applications using UWB technology may benefit sectors such as public protection, construction, engineering, science, medical, consumer appli
6、cations, information technology, multimedia entertainment and transportation; g) that devices using UWB technology for certain applications may result in their high density deployment in some environments where stations of radiocommunication services have already been or will be deployed; h) that th
7、e spectrum requirements and operational restrictions for devices using UWB technology may vary according to their application; j) that devices using UWB technology normally operate on a non-protected, non-interference basis; k) that information on the technical and operational characteristics of dev
8、ices using UWB technology and applications is needed to study the impact of devices using UWB technology on radiocommunication services; and 2 Rec. ITU-R SM.1755 l) that information on the terms and definitions associated with UWB technology, and devices using UWB technology, is needed, recommends 1
9、 that the terms, definitions and abbreviations contained in Annex 1 should be used in describing UWB technology and devices using UWB technology; 2 that the general characteristics contained in Annex 2 should be used to characterize UWB technology; 3 that the technical and operational characteristic
10、s contained in Annex 3 should be considered in studies relating to the impact of devices using UWB technology (those devices that are not presently recognized as operating under allocations to radiocommunication services) on radiocommunication systems; 4 that the following Notes will be considered a
11、s part of this Recommendation. NOTE 1 Administrations authorizing or licensing devices using UWB technology should ensure, pursuant to the provisions of the Radio Regulations, that these devices, will not cause interference to and will not claim protection from, or place constraints, on the radiocom
12、munication services of other administrations as defined in the Radio Regulations and operating in accordance with those Regulations. NOTE 2 Upon receipt of a notice of interference to the radiocommunication services referred to in Note 1 above from devices using UWB technology, administrations shoul
13、d take immediate action(s) to eliminate such interference. Annex 1 Ultra-wideband terms, definitions and abbreviations 1 Ultra-wideband terms and definitions In describing ultra-wideband (UWB) technologies and devices, the following terms have the definitions indicated: Ultra-wideband technology: te
14、chnology for short-range radiocommunication, involving the intentional generation and transmission of radio-frequency energy that spreads over a very large frequency range, which may overlap several frequency bands allocated to radiocommunication Rec. ITU-R SM.1755 3 services. Devices using UWB tech
15、nology typically have intentional radiation from the antenna with either a 10 dB bandwidth of at least 500 MHz or a 10 dB fractional bandwidth greater than 0.2.1UWB transmission: radiation generated using UWB technology. Activity factor: the fraction of time during which a device using UWB technolog
16、y is transmitting.2Impulse: a surge of unidirectional polarity that is often used to excite a UWB band-limiting filter whose output, when radiated, is a UWB pulse. Pulse: a radiated short transient UWB signal whose time duration is nominally the reciprocal of its 10 dB bandwidth. Radar imaging devic
17、e: a device used to obtain images of obstructed objects. This includes in-wall and through-wall detection, ground penetrating radar, medical imaging, construction and home repair imaging, mining, and surveillance devices. Ground penetrating radar (GPR) device: a radar imaging device that operates ty
18、pically when in contact with or within close proximity to the ground for the purpose of detecting or mapping subsurface structures. While primarily used for examining “underground”, the term “ground” can be expanded to mean any lossy dielectric material. Wall radar imaging device: a sensor that is d
19、esigned to examine and map the interior of walls. The wall is usually made of a concrete structure or similar dense impermeable material that absorbs much of the impinging radio-wave energy. Typical applications include reinforced concrete building walls, retaining walls, tunnel liners, the wall of
20、a mine, the side of a bridge, or another physical structure that is dense enough and thick enough to dissipate and absorb most of the signal strength transmitted by the imaging device. Through-wall radar imaging device: a sensor used to transmit energy through an opaque structure such as a wall or a
21、 ceiling to detect the movement or location of persons or objects that are located on the other side. These devices are deliberately designed to maximize energy transfer through an opaque structure. This category may include products such as stud locators that are designed to locate objects behind w
22、alls that are not sufficiently thick or dense enough to absorb the transmitted signal, such as gypsum, plaster or similar walls. UWB communication device: a short-range communication device to transmit and/or receive information between devices. UWB measurement device: a device used to measure dista
23、nce or position. 1The 10 dB bandwidth B10and 10 dB fractional bandwidth 10are calculated as follows: B10= fH fL10= B10/fCwhere: fH: highest frequency at which the power spectral density of the UWB transmission is 10 dB relative to fM where: fM: frequency of maximum UWB transmission fL: lowest freque
24、ncy at which the power spectral density of the UWB transmission is 10 dB relative to fM, fC= (fH+ fL)/2: centre frequency of the 10 dB bandwidth. The fractional bandwidth may be expressed as a percentage. 2For multiple devices, see 3 of Annex 3. 4 Rec. ITU-R SM.1755 Medical imaging device: a sensor
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