NavIC system to be operational again after NVS-03’s successful launch

NVS-03 restored the minimum satellite configuration required for NavIC to provide basic standalone positioning. This matters because India’s regional navigation system had been unable to provide positioning data, although its timing service continued working. The launch therefore revived a critical capability for location and navigation services.

Before the mission, NavIC had only three operational satellites: IRNSS-1B, IRNSS-1I and NVS-01. The article states that at least four satellites are needed for basic positioning. NVS-03 became the fourth operational satellite after GSLV-F18 placed it accurately into orbit.

NVS-03 must now complete several manoeuvres over the next week. These will move it from its current elliptical orbit to its intended high, circular orbit. Once operational, NavIC can support public location services, timing applications and restricted services for selected users, including the military and major construction projects.

NavIC stands for Navigation with Indian Constellation. It is the operational name of India’s Indian Regional Navigation Satellite System. The system uses a seven-satellite constellation to provide positioning, navigation and timing services across the Indian subcontinent and up to 1,500 kilometres around it.

The clearest difference is coverage. NavIC is a regional system, while America’s GPS is a global satellite navigation system. NavIC was designed to provide particularly strong coverage over India. The article notes that GPS signals can reach some Indian locations at difficult angles, especially valleys and forests.

When fully functional, NavIC was designed to offer public location accuracy of up to 10 metres. It also provides a more accurate restricted service for selected users, such as the military or organisations conducting massive construction projects. Its development supports India’s goal of self-reliance in critical technologies.

NavIC needs a minimum of four operational satellites in orbit to provide basic standalone positioning. This requirement is central to the system’s ability to determine location. Without four functioning satellites, NavIC could not provide standalone positioning data, even though its timing service remained functional.

Before NVS-03 launched, the constellation had three operational satellites: IRNSS-1B, IRNSS-1I and NVS-01. The government had previously informed Parliament that this number was insufficient for basic positioning. GSLV-F18 then placed NVS-03 into orbit, making it the fourth operational satellite in the constellation.

The restored configuration does not mean the spacecraft is immediately in its final working orbit. Over the following week, NVS-03 will perform manoeuvres to reach its targeted high, circular orbit. Its addition brings NavIC back to the minimum configuration needed for location data.

NavIC’s positioning service weakened through several setbacks rather than one single failure. The article identifies satellite retirements, atomic clock malfunctions and launch failures as causes. Together, these problems reduced the number of usable satellites below the four needed for basic standalone positioning.

A major recent setback occurred when NVS-02 failed to reach its intended orbit in January. That left the satellite unable to provide positioning data. With only IRNSS-1B, IRNSS-1I and NVS-01 operational, the constellation could not meet the minimum satellite requirement for standalone location services.

Timing service was different. The government had stated that timing remained functional even while positioning was unavailable. The successful launch of NVS-03 restored the fourth-satellite minimum. After its orbital manoeuvres, the spacecraft is expected to support NavIC’s positioning capability again.

NVS-03 is not yet in its final operational orbit. GSLV-F18 placed it into an elliptical orbit measuring 170.3 by 38,080 kilometres. The intended orbit was 170.3 by 37,247 kilometres, so the launch vehicle delivered the satellite precisely, according to ISRO Chairman V Narayanan.

Over the next week, the spacecraft will execute a series of orbital manoeuvres. These manoeuvres will gradually change its current elliptical path into the targeted high, circular orbit. The article does not detail each manoeuvre, but it states that this transition is the next stage after launch.

This step is especially important because NVS-02 failed at the same stage last January. NVS-03’s solar panels have deployed, and all systems are functioning normally. Completing the transition should prepare it to support NavIC’s restored positioning capability.

A fully operational NavIC can support several important services. For the public, it was designed to provide location accuracy of up to 10 metres. It also supports positioning, navigation and timing, making it useful wherever reliable location or synchronized time is needed.

The system includes a more accurate restricted service available for a fee to selected users. The article gives major construction projects and the military as examples. NavIC can also offer better coverage over India than GPS in some places, because GPS signals may arrive at difficult angles in valleys and forests.

NVS-03 restores the minimum satellite configuration needed for basic positioning. Its eventual operation should strengthen India’s indigenous navigation capability and support the “One Nation, One Time” project. The article also links NavIC to self-reliance in critical technologies and services benefiting people.

Satellite navigation works by comparing signals sent from satellites with known positions. Each signal carries timing information from a highly precise onboard clock. A receiver measures when the signals arrive and uses the differences to estimate its distance from each satellite.

With signals from several satellites, the receiver combines those distance estimates to calculate its location. Repeated calculations show how the receiver is moving. The same process also corrects the receiver’s clock and provides accurate time. In practice, the system depends on synchronized satellite clocks and reliable signal transmission.

The article identifies positioning, navigation and timing as NavIC’s services. It also mentions atomic clock malfunctions as one reason the constellation lost positioning capability. The article does not explain the calculation process itself, so this mechanism is based on established satellite-navigation principles.