Skip to main content

Sun Outage

Image
By
Sun Outage (or Solar Outage) is a severe interference event generally resulting in the loss of satellite communications service caused by the physical geographical alignment of the sun, satellite and earth-station coming into a direct line.


Look the picture above, let's assume that virtual orbit of Sun with position from A to N.
When an Earth station and Satellite Communication is In-Line with the Sun position, then the Earth station receive heavy and very strong NOISE for Rx-path. This Sun Outage happens because Sun is the largest Noise Source with 'complete' Spectrum.
Sun Outage will be experienced by Satellite communication twice on every year, which are in March and September for a few days, duration of approximately 10 to 20 minutes a day, starting from the most West Earth-Station.
From the picture, Station A located in West of Station B, will have earlier Sun Outage (usually before noon) compared to Station B.

Labels:

Comments

Post a Comment

Popular posts from this blog

Satellite Communication - Part 4 (CPI)

By
Cross Polar Isolation (CPI) In installation and pointing/peaking antenna, Orthogonal Mode Transducer (OMT) must be set to be as precise as possible to get the best CPI value. above is picture of OMT Feed assembly include with BUC and LNB The minimum value for CPI is 30 dB (better will be good) in Linier Polarized Antennas. The reason is for our receive (Rx)-side as not to get interferenced (distrubed) by other (polarity) Down-Link users, therefore our transmit (Tx) shoild as well not interfere other users that operates at 90 deg (Orthogonal) Polarization. Note : In LH/RH Circular Polarizations, usually CPI of 27dB (=AR of 1.09) is acceptable enough. picture above is careless/miss-aligned OMT setting
Post a Comment
Read more

Satellite Communication : Transmission Bands

By
A satellite link is a radio link between a transmitting earth station and receiving earth station through a communications satellite. A satellite link consists of one uplink and one downlink; the satellite electronics (i.e., the transponder) will remap the uplink  frequency to the downlink frequency. The transmission channel of a satellite system is a radio channel using a direct-wave approach, operating in at specific RF bands within the overall electromagnetic spectrum as seen below : The table below shown some key of physical parameters of relevance to satellite communication,  The frequency of operation is in the super high frequency (SHF) range (3-30 GHz). Regulation and practice dictate the frequency of operation, the channel bandwidth, and the bandwidth of the subchannels within the larger channel. Different frequencies are used for the uplink and for the downlink. Frequencies above about 30 MHz can pass through the ionos...
Post a Comment
Read more

High Throughput Satellite Service - more than modems and transmission

By
The advent of High Throughput Satellite (HTS) has been significant amount of new satellite capacity come online in recent years, prompting industry-wide disruptive innovation. This lower cost capacity enables a new era of satellite communications, with innovative new applications spreading around the world. However, there are a number of factors that must be considered for the operation of a successful HTS service. The satellite industry is undergoing a dramatic evolution as more and more High Throughput Satellite (HTS) capacity is introduced to markets around the world, like Intelsat Epic , Inmarsat Global Express , Viasat-2 , SES-12 ,etc. HTS is bringing more and lower-cost capacity that enables the satellite industry to cost-effectively provide large-scale internet services to rural and other hard-to-serve areas around the world. To enable these services, many providers are focusing on selecting the optimal ground system, and rightly so, because the ground system is a key e...
Post a Comment
Read more