- What are the various applications of satellite navigation?
- Satellite navigation can be used for knowing the user position and time.
- The applications are in the area of civil aviation, high sea and inland waterway navigation, personal navigation, rail transport, road transport, precision agriculture, search & rescue, surveying, monitoring of tectonic plate movement for prediction of earth quakes, etc.
- What is NavIC user service area?
- NavIC service area covers the Indian landmass and an area upto 1500 km beyond Indian landmass.
- In terms of latitude and longitude, the service area is bounded approximately by the rectangle of latitude 5°S to 50°N and longitude 55°E to 110°E.
- Whether other neighbouring countries would also get the benefit of our navigation satellite services?
- Yes, the neighbouring countries which fall within the NavIC service area can use NavIC services with an appropriate user receiver.
- Can NavIC be used outside India?
- NavIC can provide the position service within the coverage area.
- When a user crosses the coverage area, navigation service can be seamlessly provided by using other global navigation satellite system by having a multi-constellation user receiver.
- What are the services provided by NavIC?
- NavIC provides two types of services:
- Standard positioning services (SPS): Available for civilian use.
- Restricted services (RS): Available only for authorised use.
- Which are the frequency bands being used by NavIC?
- NavIC provides navigation signals in two frequency bands: L5 band with centre frequency of 1176.45 MHz and S band with centre frequency of 2492.028 MHz.
- In near future, a new civilian signal will be introducedin L1 band with centre frequency of 1575.42 MHz.
- Does NavIC provide any service other than navigation?
- NavIC has a provision for one-way broadcast of short messages.
- This service is currently being used only for providing emergency warning alerts to fishermen venturing into deep sea, where there is no terrestrial network connectivity.
- When will the NavIC service be available for users?
- NavIC service is already available for users.
- How can a common citizen use NavIC?
- Application-specific receivers are available commercially off-the-shelf in the market.
- Also, a few mobile handsets in India are having NavIC capability.
- A common citizen can obtain these devices and use NavIC.
- Is there an option for a common citizen to develop applications based on NavIC?
- NavIC, or any other GNSS system, provides location input that can be used by an application software.
- A common citizen can procure receiver modules, enabled with NavIC, from the market and develop applications on the top of it.
- If anyone wants to develop a NavIC receiver module, all the signal details are available onhttps://www.isro.gov.in/sites/default/files/irnss_sps_icd_version1.1-201....
- Is there an option for a common citizen to develop applications specific for NavIC messaging service?
- The signal details related to NavIC messaging service are available on https://www.isro.gov.in/sites/default/files/article‑files/irnss‑programme/sis_icd_irnss1a_incois_isro_v1.1_19jul2019.pdf.
- Is NavIC available in the mobile phones in India?
- Yes, currently (mid-2021) there are about two dozen mobile handsets in India with NavIC capability.
- The number is progressively increasing because all the major mobile chipset manufacturers have incorporated NavIC in their latest chipsets.
- Can NavIC signals be received and decoded by any navigational receiver?
- The navigational receiver should work in the NavIC frequency bands with a suitable decoder.
- If the navigation receiver is kept inside a building and the antenna is positioned outside the building some distance away, will the receiver report position of the receiver inside the building correctly?
- Any navigation receiver computes the position of the antenna and not the receiver unit itself.
- In case the antenna is placed outside the building with sufficient clear view to the sky, and sufficiently less cable length is maintained, the receiver will correctly report position of the antenna.
- What are the error sources which affect the user position accuracy in satellite navigation?
- Ionospheric group delay, satellite ephemeris, and satellite clock are the three major error sources which affect user position accuracy in satellite navigation.
- Multipath, tropospheric group delay and receiver measurement errors are the other error sources.
- Can the navigation receiver be jammed by using high power transmitters?
- Yes, navigation receiver can be jammed by using strong radio frequency (RF) energy over its operating bandwidth.
- What is Remote Sensing used for?
Remote sensing technology is used in a wide variety of disciplines in thousands of different use cases, including most earth sciences, such as meteorology, geology, hydrology, ecology, oceanography, glaciology, geography, and in land surveying, as well as applications in military, intelligence, commercial, economic, planning, and humanitarian fields.
- What is the importance of Remote Sensing?
Remote sensing makes it possible to collect data from dangerous or inaccessible areas. It replaces slower, costly data collection on the ground, providing fast and repetitive coverage of extremely large areas for everyday applications, ranging from weather forecasts to reports on natural disasters or climate change.
- How can I obtain satellite data in India?
One can obtain the satellite images in India as per RSDP 2011. As per this, all satellite images of resolutions up to 1m is can be obtained from NRSC on non-discriminatory basis and “as requested basis”. The data could be free or on payment basis. All satellite images of better than 1m resolution shall be provided subject to screening and clearance by a committee.
- How the satellite data pricing is done?
Satellite data products are sold to user as per Remote Sensing Data Pricing Policy (RSDPP-2015). It is a comprehensive policy positioned for defining the modalities for pricing the data from IRS satellites for users. It provides guidelines for data products pricing for various user categories, subscription services, discount criteria etc.
- Can I obtain satellite freely for my use?
To create general awareness and encourage research activities, certain amount of archived data with a latency of two years was also approved for dissemination through NRSC EO Open data Archive (NOEDA) facility of BhuvanGeoPortal. It allows the users to select and download Elevation data of CartoDEM(1arc second), Satellite data of Resourcesat-1/2/2A:AWiFs data(56m), LISS-III(24m) and Oceansat data pertaining to OCM and Scatterometer, derived products from AWiFS and OCM.