Analysis of satellite interference causes and improved solutions

Global satellite interference is deteriorating. At the Broadcast Asia 2006 satellite conference, industry contenders discussed the causes of the interference and proposed solutions to improve the situation.

Undoubtedly, signal interference will have a negative impact on all satellite services, especially for broadcast and VSAT networks. The changing drivers of the satellite industry and user expectations for broadband and space do not allow for ineffective or unintentional interference.

At the satellite subgroup meeting jointly organized by the Satellite User Rejection Interference Group (SUIRG) and the Asian Cable & Satellite Broadcasting Association (CASBAA), Karl Rossiter, Chairman of the CASBAA Technical Committee and Chief Technology Officer of the Zieland Group, said that in the past few years, SUIRG has been Tracking and analyzing accidents that interfere with satellite transmissions. There are about 4,000 incidents of interference incidents each year. He pointed out that "operational errors and negligence related to the ground portion of the uplink have been identified as critical factors." Africa and South America show the highest rate of human error, Asia is mainly adjacent satellites and satellite antennas that are too small The problem.

In order to estimate the situation in Asia, Rossiter pointed out that there are 63 countries in the Asian region, which means that there are 63 business management agencies, each with its own management environment. Furthermore, this area is in saturation with satellite operators. There are at least 22 operators who provide satellite services; competition is fierce; the relationship between operators is competitive and sometimes uncooperative. He cited some facts that made the satellite interference problem worse.

SUIRG stated that complaints from certain regulatory agencies regarding satellite interference caused by their national operators were slow or ineffective, while other regulatory agencies or certain non-governmental entities did not punish transparently and deliberately interfered with legal transmission.

The required ground systems and satellite operators are also very different in technology and standards. Too adjacent network interference is ubiquitous.

Incorrect antenna adjustment is another source of interference that often occurs. Since the installer is rarely equipped with a truly suitable device, it is generally the operator who explains to the inexperienced installer how to adjust the polarization angle on the VSAT.

Rossirer believes that "a remedy for this situation is to raise awareness of interference issues and appropriate technical training for satellite uplink operators." Jonarhan Higgins, general manager of Beaconseek, based in the UK, also believes that training It is extremely important. He pointed out that because of the easy-to-use satellite news gathering (SNG) tools, even those who do not know the technology can operate the equipment, which increases the amount of jitter in the satellites over the world. To ensure that these operators have the knowledge and skills needed to operate satellite news gathering tools without causing interference to other users, Higgins has proposed an Internet-based Web training network portal program for satellite news gathering tool operators. The training program consists of a theoretical and practical application model. Participants can pass each model at their own pace, but they need to complete the training within one year. Industry-recognized specifications will be distributed as soon as they are completed.

Many industry organizations are trying to collaborate on satellite interference by training operators, and they also agree on a common uplink process. These organizations include eight members of the World Wide Group (WBU) and the Inter-union Satellite OperaTIons Group (ISOG), as well as the Global VSAT Forum (GVF), World Teleport Associarion (WTA) and CASBAA.

Recently, the industry has agreed to the universal access process for uplinks. These processes are also recognized by the International Telecommunication Union and are now focused on uplink training.

From the manufacturer's point of view, Stephen Rudd, general manager of Advent CommunicaTIons in the UK, acknowledged the need for SNG system providers like Advent CommunicaTIons and industry groups such as SUIRG to work together to address the growing problem of satellite interference. “We need to develop standards for installation practices, provide better testing procedures for new equipment and ensure high standards of professional training for operators,” he said.

For broadcasters such as ESPN Star Sports (ESS), the economic losses caused by satellite interference are enormous. In some cases, an alternate line is required, and if the service provider's line is susceptible to interference, then such a service provider is cancelled.

Andy Rylance, engineering director at ESS, was a bit frustrated, but he did a real analysis of satellite interference and line downtime. He said, "Who pays for satellite interference? It’s all of us." He cited some aspects of interference that affected broadcasters. Losses are commercial and satellite interference can cause disruptions in business activities. Due to the impaired quality of the program signal, the ratings are also affected, because viewers naturally have to find channels with clear signals. The credibility of broadcasters will also suffer. Rylance said that if you are often subjected to satellite interference, people lose their trust in you. ”

How can broadcasters be protected from satellite interference? Rylance is in favor of taking special protective measures. Broadcasters can consider using a variety of different satellite feeds, but that may double the transmission fee. Another option is to use fiber to send content, but fiber can also cause a variety of problems, because the fiber is ground-based, requires a lot of electronic equipment, and engineering complexity.

This issue is not just about broadcasters. Unusable spaces also cost satellite operators. Rylance cautioned that "if the industry does not take certain measures, the losses caused by satellite interference will ultimately be borne by all parties."

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