Abstract
The nature of variations of L band satellite signal strength for direct reception -both in fixed as well as in mobile reception are important technical parameters for the planning of satellite broadcast and communication services network. These parameters have been assessed through a field experiment using simulated satellite conditions. Variation of signal strength due to vegetation; urban structures; etc. as well as the building penetration loss along with the Standard Deviation of each of these variations has been assessed based on the data collected during the fixed and mobile reception. This paper gives an insight into the propagation in ‘L’ band under the simulated satellite conditions.
Highlights
The ITU World Administrative Radio Conference-92 (WARC-92) held in Torremolinos, Spain, during February/March 1992, allocated frequency bands between 1000 and 3000 MHz ( L Band ) to Broadcast Satellite Service(BSS)Sound and complementary Sound broadcasting
A frequency band between 1452 and 1492 MHz was allocated on a world-wide basis, with the exception of the USA, to the Broadcast Satellite Service (BSS) and the Broadcast Service (BS) for Digital Sound Broadcasting (DSB)
The difference of signal levels outside and inside the building gives the ‘building attenuation’; the difference of signal levels in a given environment taken without shadow and with shadow of an obstacle, gives the ‘shadow loss’; the difference between the field strengths measured at 10 meters antenna height and that measured at the required antenna height gives the antenna height correction factor
Summary
The ITU World Administrative Radio Conference-92 (WARC-92) held in Torremolinos, Spain, during February/March 1992, allocated frequency bands between 1000 and 3000 MHz ( L Band ) to Broadcast Satellite Service(BSS)Sound and complementary Sound broadcasting. These bands are limited to the use of digital sound broadcasting. The world Administrative Radio Conference (WARC) organized by the ITU in Feb. 1992 interalia allocated a 40 MHz spectrum in ‘L’ band from 1452 to 1492 MHz for satellite sound Broadcasting service. Report ITU-R BS.[955-2] provides details of a new high quality advanced digital sound broadcasting service (Popularly termed as DAB) which could be supported through satellite in WARC’ 92 allocated ‘L’ band spectrum for large area coverage. For planning the broadcast service it is necessary to assess the nature of signal level variation in small areas under various receiving environments as stated above
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