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陸地移動和固定的無線電發(fā)射器和接收器檢測項目報價？??解決方案？??檢測周期？??樣品要求？ |
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本標(biāo)準適用于工程測量及其有關(guān)應(yīng)用領(lǐng)域。
There is an increasing interest worldwide for digital sound broadcasting to vehicular, portable and fixed receivers in the broadcasting-satellite service (BSS) (sound) bands allocated at the World Administrative Radio Conference for Dealing with Frequency Allocations in Certain Parts of the Spectrum (Malaga-Torremolinos, 1992) (WARC-92), and that several satellite-based digital sound broadcasting services for national and supra-national coverage are being considered. Developed for both satellite and terrestrial broadcasting applications in order to allow a common low-cost receiver to be used. Digital System B, originally proposed by Voice of AmericdJet Propulsion Laboratory (VONJPL), was designed to provide maximum efficiency on board a communications satellite. Digital System Ds, also known as the Worldspace system, is primarily designed to provide satellite digital audio and data broadcasting for fixed and portable reception. Digital System DH, also known as the hybrid satellite terrestrial Worldspace system, is designed to provide satellite digital audio and data broadcasting for vehicular, fixed and portable reception by inexpensive common receivers. Digital System E, also known as the ARIB (Association of Radio Industries and Businesses) system, is designed to provide satellite and complementary terrestrial on-channel repeater services for high-quality audio and multimedia data for vehicular, portable and fixed reception.
There is an increasing interest worldwide for digital sound broadcasting to vehicular, portable and fixed receivers in the broadcasting-satellite service (BSS) (sound) bands allocated at the World Administrative Radio Conference for Dealing with Frequency Allocations in Certain Parts of the Spectrum (Malaga-Torremolinos, 1992) (WARC-92), and that several satellite-based digital sound broadcasting services for national and supra-national coverage are being considered. Developed for both satellite and terrestrial broadcasting applications in order to allow a common low-cost receiver to be used. Digital System B, originally proposed by Voice of AmericdJet Propulsion Laboratory (VONJPL), was designed to provide maximum efficiency on board a communications satellite. Digital System Ds, also known as the Worldspace system, is primarily designed to provide satellite digital audio and data broadcasting for fixed and portable reception. Digital System DH, also known as the hybrid satellite terrestrial Worldspace system, is designed to provide satellite digital audio and data broadcasting for vehicular, fixed and portable reception by inexpensive common receivers. Digital System E, also known as the ARIB (Association of Radio Industries and Businesses) system, is designed to provide satellite and complementary terrestrial on-channel repeater services for high-quality audio and multimedia data for vehicular, portable and fixed reception.
Digital System DH, also known as the hybrid satellite/terrestrial WorldSpace system, is designed to provide satellite digital audio and data broadcasting for vehicular, fixed and portable reception by inexpensive common receivers
The ITU Radiocommunication Assembly considering: a) that there is an increasing interest worldwide for terrestrial and satellite digital sound broadcasting (DSB) to vehicular, portable and fixed receivers in the frequency range 30-3 000 MHz for local, regional and national coverage; b) that the ITU-R has already adopted Recommendations ITU-R BS.774 and ITU-R BO.789 to indicate the necessary requirements for DSB systems to vehicular, portable and fixed receivers for terrestrial and satellite delivery, respectively; c) that by operating the broadcasting-satellite service (BSS) (sound) in an hybrid configuration the service objectives listed in b) above can be more adequately met; d) that Recommendations ITU-R BS.774 and ITU-R BO.789 recognize the benefits of complementary use of terrestrial and satellite systems, and call for a DSB system allowing a common receiver with common processing very large scale integration (VLSI) circuits and manufacturing of low-cost receivers through mass production; e) that Digital System D H described in Annex 2 meets most or all of the requirements of Recommendations ITU-R BS.774 and ITU-R BO.789, and that the system has been field tested and demonstrated in more than one country; f) that Digital System E described in Annex 3, meets most or all of the requirements of Recommendations ITU-R BS.774 and ITU-R BO.789, and that it has been field tested; g) that some systems included in Recommendation ITU-R BO.1130 have a terrestrial component which allows augmentation of the BSS (sound) part, hence creating a hybrid satellite/terrestrial system.
The options listed below all depend on the condition that a particular radar installation has unequivocally been identified as the one causing the interference.
The ITU Radiocommunication Assembly, considering that radar systems can produce interference to digital radio-relay systems (DRRSs) in some situations; that there are two coupling mechanisms by which radiated energy from radar stations may be coupled into radio-relay systems: radar spurious emission in the radio-relay bands; radio-relay system front-end overload (receiver desensitization) caused by the radar fundamental frequency; that the most desirable method of mitigating the interference may be to reduce the spurious emissions at the radar transmitter to a sufficiently low level; that some of the techniques employed by radio-relay system designers to enhance system performance are expected to reduce the susceptibility of these systems to interference from radar transmitters.
In preparing the text for the draft CPM-07 Report, there were a number of input documents providing information on sharing conditions in the 4-10 MHz band. Although these documents have been taken into account in the revision of the draft CPM text for WRC-07 Agenda item 1.13, they contain valuable information for ITU-R studies in HF bands and have been used to create a new Report.
The purpose of this Report is to summarize the results of the studies related to the compatibility between Earth exploration-satellite service (EESS)(active) and the radiodetermination service in the 9 300-9 500 MHz and 9 800-10 000 MHz bands and between EESS (active) and the fixed service in the 9 800-10 000 MHz band.
Frequency bands have been allocated and identified for use by GSO and non-GSO FSS systems in bands shared on a primary basis with the FS. WRC-95/97 adopted a different set of provisions through No. 5.523A of the Radio Regulations (RR) to the non-GSO FSS utilizing the bands 18.8-19.3 GHz and 28.6-29.1 GHz from those provisions for non-GSO FSS utilizing bands outside these bands. This Report addresses only the 18.8-19.3 GHz band, which is referred to throughout as the 18/19 GHz band.
The passive radio astronomy service (RAS) is studying natural phenomena producing radio emissions at frequencies fixed by the laws of nature. Primary allocations have been made to various space services in the Earth-to-space direction such as the fixed-satellite service (FSS), radionavigation-satellite service (RNSS), mobile-satellite service (MSS) and broadcasting-satellite service (BSS) in bands adjacent or nearby to bands allocated to the RAS.
The purpose of this report is to summarize the result of the studies on sharing the 36-37 GHz band by the fixed and mobile services and the Earth exploration-satellite service (EESS) (passive).
The purpose of this report is to summarize the result of the studies on sharing the 36-37 GHz band by the fixed and mobile services and the Earth exploration-satellite service (EESS) (passive).
This Report provides information on the current status of terrestrial electronic news gathering (ENG), television outside broadcast (TVOB) and electronic field production (EFP) systems.
