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Chinese Scientists Develop World's First Tiantong Satellite-Enabled Smartphone Direct Calls

Chinese Scientists Develop World's First Tiantong Satellite-Enabled Smartphone Direct Calls

26-05-2024

A team of Chinese engineers and scientists have developed the world’s first satellite that lets smartphones place a call directly through it, instead of mobile towers. The idea is, that in case of an emergency where mobile connectivity may be severely impacted because of a natural calamity or any other disaster, people can call for help directly, by connecting to an overhead communication orbiter.

Tiantong Satellite Initiative:

  1. About:
    1. The Tiantong satellite initiative is a strategic response to the growing demand for connectivity, especially in remote and disaster-prone areas.
    2. Each Tiantong satellite has a lifespan of 12 years and can withstand extreme temperature variations while transmitting and receiving electromagnetic waves.
    3. The first satellite in the Tiantong-1 series was launched in 2016, followed by 2 more in 2020 and 2021.
    4. The 3 satellites form a network in a geosynchronous orbit, covering the entire Asia-Pacific region.
  2. Need:
    1. The idea for such a satellite came about after 2008, when Sichuan, a province in southwestern China, was struck by a devastating magnitude-8 earthquake, resulting in the tragic loss of over 80,000 lives.
    2. The Chinese government recognized the need for enhancing communication resilience in disaster-prone areas.

Issues

Solutions
  1. Satellite communication with mobile phones may face challenges due to signal interference.
  2. Commercial communication satellite networks have faced significant disruptions because their signals overlap with the receiving frequency band.
  3. As the number of satellites increases, the risk of passive intermodulation (PIM) occurring also increases.
  4. PIM can deteriorate satellite call quality and lead to system failure.
  5. There is currently no universally effective technology to suppress the occurrence of PIM.
  1. China's Tiantong Project has gathered experts to address the issue of PIM.
  2. Scientists have observed that different metal components in satellite antennas cause PIM.
  3. Researchers have explored microscopic physical mechanisms and developed a physical model to predict PIM effects across different contact states and external factors.
  4. The team created the world's first universal PIM simulation software for numerical analysis and evaluation of PIM generation in complex microwave components.
  5. Engineers have developed effective PIM suppression techniques, including dielectric isolation capacitors and optimized antenna wire preparation methods.
  6. The world's most sensitive PIM detection technology has been enhanced to pinpoint the source of weak PIM emissions

 

 

 

 

 

 

 

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