Express AM6 Ka-band spot beams

 

 

2. IPSTAR ( www.ipstar.com )

Thaicom Public Company Limited (formerly named Shin Satellite) is headquartered in Bangkok. It was founded on 7th November 1991 by Shin Corporation Plc. (“SHIN”), which was granted a 30-year Build-Transfer-Operate concession from Thailand’s Ministry of Transport and Communications (now transferred to “Ministry of Information and Communication Technology”) to operate the country’s first communications satellite. The concession expires in 2021.

T HAICOM 4 (IPSTAR) Satellite

THAICOM 4 (IPSTAR) was launched in 2005 and is owned and operated by Thaicom. It was the first commercial high throughput satellite (HTS) launched. The satellite was designed for two-way communications over an Internet Protocol (IP) platform and has a maximum throughput of 45 Gbps. The satellite has 87 downlink Ku-band spot beams. The satellite also carries 10 Ka-band uplink transponders. When launched in 2005 it was the heaviest commercial communication satellite launched to date weighing 6505 kg.

I PSTAR Service

The IPSTAR service has a download speed up to 5 Mbps and an upload speed up to 4 Mbps and therefore is only a second generation broadband VSAT system. IPSTAR now has frequency licenses in 14 countries in Asia Pacific area, allowing operators and service providers to provide broadband Internet access via satellite. With its many gateway stations (presently 18) IPSTAR can provide access to high-capacity ground networks with affordable bandwidth. A wide-band data link from the gateway to the user terminal employs an Orthogonal Frequency Division Multiplexing (OFDM) with a Time Division Multiplex (TDM) overlay. These forward channels employ highly efficient transmission methods, including Turbo Product Code (TPC) and higher order modulation (L-codes) for increased system performance.

In the terminal-to-gateway direction (or return link), the narrow-band channels employ the same efficient transmission methods. These narrow-band channels operate in different multiple-access modes based on bandwidth-usage behavior, including ALOHA and TDMA for STAR return link waveform.

Thaicom has started to sell bulk satellite capacity and announced in May 2011 a contract with Malaysia’s Measat satellite operator for capacity on IPSTAR. Under the 10-year contract Measat will purchase access to seven IPSTAR spot beams delivering a total of 3.3 Gbps. Thaicom has stated that this represents 7 percent of the satellite’s total capacity. The bandwidth will be marketed in Malaysia as Measat 5.

IPSTAR satellite beams

3.  ViaSat Inc. ( www.viasat.com)

ViaSat was principally a satellite terminal manufacturer but it has over the years expanded its activities. ViaSat now owns WildBlue, the successful US Ka-band satellite broadband service provider. WildBlue’s growth was stunted shortly after launch due to a lack of in-orbit capacity covering high-demand areas in the United States. To address this shortfall in capacity ViaSat embarked on the ViaSat-1 project.

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