Latest Science News
NavIC frequency too close to WiFi, may cause interference: Study

~By Dinesh C Sharma
NavIC, India’s very own navigation satellite system, is projected to provide positioning and navigation services on the lines of US-owned Global Positioning System (GPS). However, a new study has warned that signals from NavIC satellites may interfere with WiFi signals in receivers.
The Indian navigation and positioning system consists of a constellation of seven satellites launched by the Indian Space Research Organisation (ISRO) between 2013 and 2018. The technology is likely to be available on smartphones and car navigation systems in future.
The NavIC satellites send signals in frequency bands of L5 (1176.45 MHz) and S-band (2492.08 MHz). S-band is utilized by NavIC for navigation systems, but the same band is also shared by other communication systems like Long-Term Evolution (LTE), Bluetooth and Wireless Fidelity (Wi-Fi).
The study says that NavIC signals get affected by out of band interference due to Wi-Fi signal as the two are located closely. It found that “NavIC reception on S-band frequency is severely affected by Wi-Fi transmission.”
“These interfering signals present a threat to the NavIC receiver performance. To equip both the facilities (WiFi and NavIC) in future cell phones, it will be a challenge to mitigate such kind of radio frequency interference,” says the study published in journal Current Science. The study was done by Dr Shweta N Shah of Electronics Engineering Department at Sardar Vallabhbhai National Institute of Technology, Surat, and Ph D scholar Darshna D Jagiwala. ISRO’s Ahmedabad-based Space Applications Centre (SAC) provided necessary equipment for the study.
Explaining the findings, Dr Shah told India Science Wire that “NavIC has S band signals and there are much stronger terrestrial S band signals that can pose problem for S band and dual frequency Standard Positioning Service (SPS) receivers of NavIC if not addressed properly.”
Currently, she said “Wi-Fi receivers are present in every cell phone. That’s why it was necessary to study Wi-Fi interference to verify the performance of NavIC signal reception in cellphones. This kind of interfering signal represents a threat to the performance of the NavIC receivers.”
In the experimental set up having both types of receivers, it was found that a part of the S-band of NavIC system overlaps the unlicensed band which is shared by other communication technologies like Bluetooth, Wi-Fi and Industrial Scientific Medical (ISM) bands. When the frequency channel of Wi-Fi was superimposed with the frequency of the S-band signal of the NavIC receiver, interference was observed in S-band signal of NavIC receiver due to the extremely low power level of the signal at the user’s receiver.
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Wireless experts feel radio frequency interference between NavIC and other bands may pose regulatory challenges, besides quality of services. In India, Wi-Fi signals are exempted from licensing in the frequency band 2400 – 2483.5 MHz. This means the usable part of any Wi-Fi system or channel India must be contained within 2483.5 MHz.
“Residual or unintended signals normally go beyond this limit due to the basic characteristic of digital emissions. The NavIC signal is centered at 2492.08 MHz with a bandwidth of ± 8.25 MHz. This means that the lower part of NavIC signal can get interference from residual / unintended signals of Wi-Fi systems. Also, the upper part of the NavIC signal goes beyond 2500 MHz and since the frequency band above 2500 MHz is used for other purposes, NavIC receivers can pick up signals (and receive interference) from such other systems operating above 2500 MHz,” explained Pawan Kumar Garg, former Wireless Advisor, Government of India, while speaking to India Science Wire.
“To reduce interference from Wi-Fi (below 2483.5 MHz) as well as systems operating above 2500 MHz, it is desirable that the NavIC receivers should use reduced bandwidth of ± 7.5 MHz, if possible, and with sharp cut off filters on both ends,” Garg added. (India Science Wire)
Latest Science News
Elon Musk’s SpaceX eyes for its first orbital launch to reach Mars via spacecraft, here’s the first glimpse | WATCH
In September 2019, Musk had announced that SpaceX aimed to fly people to Mars by 2024. The Starship spacecraft will be capable of carrying about 100 people at a time and the company aimed to launch its first orbital test flight within the next six months, Musk had also said during his presentation.

Elon Musk’s SpaceX is looking for its first orbital launch to reach Mars via spacecraft. The billionaire founder, who has revolutionised commercial space travel, has now released a simulation of what the journey to Mars will look like.
This will be real in our lifetime, Musk tweeted after releasing the Martian simulation.
Last week, the billionaire had released the details about the development of Starship, the world’s most powerful rocket ever built.
Standing alongside the 390-foot (119-meter) rocket at SpaceX’s Texas spaceport, Musk had also said let’s make this real! This is really some wild stuff here. In fact, hard to believe it’s real.
In September 2019, Musk had announced that SpaceX aimed to fly people to Mars by 2024. The Starship spacecraft will be capable of carrying about 100 people at a time and the company aimed to launch its first orbital test flight within the next six months, Musk had also said during his presentation.
Elong Musk has estimated that the Starship launch could wind up costing less than $10 million.
From the beginning of the year 2022, the SpaceX has been ramping up operations with its workhorse Falcon-9. The company has also been launching Starlink constellations and cargo to the International Space Station.
Latest Science News
Stephen Hawking birth anniversary: Google Doodle pays tribute to legendary scientist
Hawking is mainly known for his theories on black holes. He revolutionized the modern physics with his theories on origins and mechanics of the universe. His intellectual and curiosity about new things, earned him a nickname Einstein.

Stephen Hawking the legendary scientist and theoretical physicist would be celebrating his 80th birth anniversary. To mark the special day, search engine company Google paid tribute to the English cosmologist and author with a two and half minutes long animated video on their homepage.
Born in Oxford, England, Stephen Hawking was fascinated by the universe from a very young age. However, Hawking was diagnosed with a rare disease named neurodegenerative when he was just 21 years old. The disease slowly forced him to sit on a wheelchair. As the time passed, he started losing his voice and after a while he lost his speech. Therefore, he started to communicate through a speech generating device, which was invented by himself. Google describes the legendary scientist as ‘one of history’s most influential scientific minds’.
Hawking is mainly known for his theories on black holes. He revolutionized the modern physics with his theories on origins and mechanics of the universe. His intellectual and curiosity about new things, earned him a nickname Einstein.
In 1965, Hawking defended his PhD thesis on ‘Properties of Expanding Universe’ at the Cambridge University. The revolutionary theory presented that space and time originated from a singularity.
Here are some of the best quotes by Stephen Hawking
- One, remember to look up at the stars and not down at your feet. Two, never give up work. Work gives you meaning and purpose and life is empty without it. Three, if you are lucky enough to find love, remember it is there and don’t throw it away.
- Quiet people have the loudest minds.
- Intelligence is the ability to adapt to change.
- The victim should have the right to end his life, if he wants. But I think it would be a great mistake. However bad life may seem, there is always something you can do, and succeed at. While there’s life, there is hope.
Education
IIT Kanpur 54th Convocation: Prime Minister Narendra Modi launched blockchain-based digital degrees
The 54th convocation ceremony of the Indian Institute of Technology (IIT) Kanpur was held today. A total of 1723 students received their diplomas, with three eminent individuals receiving honorary doctorate degrees. Prime Minister Narendra Modi was also present there in the convocation ceremony.

The 54th convocation ceremony of the Indian Institute of Technology (IIT) Kanpur was held today. A total of 1723 students received their diplomas, with three eminent individuals receiving honorary doctorate degrees. Prime Minister Narendra Modi was also present there in the convocation ceremony.
At the 54th convocation ceremony of the Indian Institute of Technology (IIT), Kanpur’s primary guest was Prime Minister Narendra Modi. The governor of Uttar Pradesh, Anandiben Patel, and the Chief Minister of Uttar Pradesh, Yogi Adityanath, were honoured as the guests at the event.
The 54th convocation of IIT Kanpur was organized in a hybrid format, with the institution ensuring. An aggregate of 1,723 students got their diplomas, with 880 of them attending convocation in person on campus and the rest participating online or over the phone.
All candidates received digital degrees based on a blockchain-based system created in-house at IIT Kanpur as part of the National Blockchain Project.
Prime Minister Narendra Modi has announced the establishment of blockchain-based digital degrees. These digital degrees are irreversible and may be recognized worldwide. In certain states, the same technology is being utilized to implement land records.
Prime Minister Narendra Modi said that this is entirely technologically based. Even in this decade, people should know how to continue to expand their hegemony in a variety of industries. In some ways, life would be incomplete without knowledge. This is the age of life’s and knowledge’s competitors.
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