NIOT to install a high-frequency (HF) radar at Karaikal, Puducherry — pairing with the Cuddalore station to monitor surface currents up to 200 km offshore for cyclone early warning.
Why in News
The National Institute of Ocean Technology (NIOT), an autonomous institute under the Ministry of Earth Sciences (MoES), is set to install a high-frequency (HF) radar system along the coast of Karaikal in Puducherry — strengthening India's coastal-surveillance and ocean-observation infrastructure on the eastern seaboard. NIOT has shortlisted two sites — Kilinjalmedu and Akkempettai — for the installation. The new radar will operate in pairing mode with NIOT's existing facility at Cuddalore, improving accuracy of surface-current and wave measurements out to ~200 km offshore. Data feeds INCOIS and IMD for cyclone forecasting; the project sits under a Puducherry-MoES Blue Economy MoU.
At a Glance
- Implementing agency
- National Institute of Ocean Technology (NIOT) — under Ministry of Earth Sciences
- Location
- Karaikal region of Puducherry — sites at Kilinjalmedu and Akkempettai
- Pairs with
- existing NIOT HF radar station at Cuddalore (Tamil Nadu coast)
- Range
- surface currents and waves up to 200 km offshore
- Weather event detection radius
- 80-100 km
- Parameters measured
- current speed, wave patterns, wind pressure, temperature gradients
- Anchoring agreement
- MoU between Puducherry and Ministry of Earth Sciences on Blue Economy
- Downstream consumers
- INCOIS (Hyderabad), IMD (New Delhi)
- Use cases
- cyclone prediction, coastal advisories, marine-spatial planning, sustainable fisheries
- Indian Coastal Ocean Radar Network (ICORN)
- NIOT operates ~10 HF radar stations along Indian coasts
- Karaikal is one of four districts of the UT of Puducherry (others
- Puducherry, Yanam, Mahe)
- Indian east coast is highly cyclone-prone — Bay of Bengal forms ~80% of all Indian cyclones
What HF radars do and how they work
High-frequency (HF) radars — also called coastal ocean radars or 'over-the-horizon radars' for surface use — are land-based systems that transmit electromagnetic pulses in the HF band (3-30 MHz) which propagate along the conductive ocean surface well beyond the visual horizon. Doppler-shifted return echoes from ocean waves are decoded to extract surface current velocity (using the Bragg scattering mechanism, which produces a known radar return at half the radar wavelength). HF radars can measure surface currents up to 200 km offshore at radial resolutions of ~5-15 km. They work in pairs (or triplets): two paired stations along the coast triangulate radial current measurements into a 2-D vector field. NIOT's network uses SeaSonde-type systems with separated transmit (~7 m height) and receive (~4 m) antennas.
The Karaikal-Cuddalore pair
The new Karaikal station — at one of the two shortlisted sites, Kilinjalmedu or Akkempettai — will operate in pairing mode with NIOT's existing Cuddalore facility (Tamil Nadu, ~50 km north of Karaikal along the coast). The pairing geometry transforms each station's radial-only measurement into resolved 2-D surface-current vectors over the overlapping coverage area, dramatically improving accuracy. Along with currents, the radar can measure wave height and direction, wind pressure and temperature gradients at the air-sea interface. Detection of approaching weather events is feasible within an 80-100 km radius. Data flows to the central servers at NIOT (Chennai) and INCOIS (Hyderabad) via V-SAT/GPRS in near real time, where it feeds numerical weather prediction (NWP) models.
Why this matters for the Bay of Bengal coast
The eastern Indian coastline — including Tamil Nadu, Puducherry, Andhra Pradesh, Odisha, West Bengal — experiences approximately 80% of all Indian cyclones that form in the Bay of Bengal. Cyclones such as Phailin (2013), Hudhud (2014), Vardah (2016), Fani (2019), Gaja (2018), Yaas (2021) and Michaung (2023) have caused major loss of life and property along this coast. HF radar data feeds directly into IMD's cyclone-track forecasting and INCOIS's storm-surge advisories. The Karaikal site densifies the existing Indian Coastal Ocean Radar Network (ICORN) — currently spanning Gujarat, Karnataka, Goa, Kerala, Tamil Nadu, Andhra Pradesh, Odisha, the Andaman Islands and now Puducherry.
Blue Economy and the institutional frame
The project sits under a Memorandum of Understanding between the Government of Puducherry and the Ministry of Earth Sciences on Blue Economy cooperation. India's Blue Economy vision — outlined in the Draft Blue Economy Policy (2021) by the Economic Advisory Council to the PM — aims to harness ocean resources sustainably for growth, jobs, and climate resilience. Cabinet has also approved the 'Mission Mausam' umbrella programme for weather-and-climate sciences. NIOT — established in 1993 in Chennai — has been the national lead on indigenous ocean technologies, including tsunami bottom-pressure recorders, drifters, ocean gliders, and the ICORN HF-radar network.
Static GK
- •: NIOT was established in November 1993 at Chennai under MoES.
- •Puducherry is a Union Territory with four geographically separate districts: Puducherry, Karaikal, Mahe, Yanam — total area ~480 sq km.
- •: Karaikal is enclaved within Tamil Nadu's Cuddalore and Mayiladuthurai districts; Mahe within Kerala; Yanam within Andhra Pradesh.
- •: INCOIS was established in 1999 in Hyderabad as an autonomous institute under MoES.
- •: Cuddalore (Tamil Nadu) hosts an existing NIOT HF radar station that will pair with the new Karaikal site.
- •: India operates two tsunami bottom-pressure recorder (BPR) systems in the Indian Ocean — components of the Indian Tsunami Early Warning System (ITEWS) at INCOIS.
- •: India's east coast (Bay of Bengal) sees ~4× more cyclones than the west coast (Arabian Sea).
- •: Cyclone Phailin (Oct 2013) hit Odisha; Hudhud (Oct 2014) hit Andhra Pradesh; Fani (May 2019) hit Odisha — all major recent east-coast events.
- •: The 'Sagarmala' programme (launched 2015) is India's port-led development initiative for the Blue Economy.
- •: 'Mission Mausam', a Cabinet-approved umbrella scheme (~₹2,000 crore in 2024-25) aims to strengthen weather and climate services through MoES.
Timeline
- 1875India Meteorological Department (IMD) established
- 1993NIOT established at Chennai under MoES
- 1999INCOIS established at Hyderabad
- 2004Indian Ocean Tsunami catalyses ITEWS at INCOIS; impetus for ICORN
- 2008ICORN HF-radar network operational along Indian coasts (early stations)
- 2015Sagarmala port-led development programme launched for Blue Economy
- 2021Draft Blue Economy Policy released by Economic Advisory Council to PM
- 2024Cabinet approves Mission Mausam umbrella scheme for weather and climate
- April 2026NIOT shortlists Kilinjalmedu and Akkempettai (Karaikal) for new HF radar station, paired with Cuddalore
- →NIOT = National Institute of Ocean Technology (Chennai, est. 1993).
- →Parent ministry: MoES.
- →INCOIS: Hyderabad (est. 1999); IMD: New Delhi (est. 1875).
- →Karaikal sites: Kilinjalmedu + Akkempettai.
- →Karaikal pairs with Cuddalore HF radar.
- →HF radar range: 200 km surface currents.
- →Detection radius: 80-100 km for weather.
- →HF band: 3-30 MHz; uses Bragg scattering.
- →Network = ICORN (Indian Coastal Ocean Radar Network).
- →Puducherry UT: 4 districts — Puducherry, Karaikal, Mahe, Yanam.
- →Karaikal: enclaved within TN; Mahe: within Kerala; Yanam: within AP.
- →Bay of Bengal = ~80% of Indian cyclones.
- →Major cyclones: Phailin 2013, Hudhud 2014, Fani 2019.
Exam Angles
NIOT will install a high-frequency (HF) radar at Karaikal, Puducherry — at Kilinjalmedu and Akkempettai — extending India's eastern coastal-current monitoring network to support cyclone forecasting.
Q1. The National Institute of Ocean Technology (NIOT), set to install a new HF radar in Karaikal in 2026, functions under which Union ministry?
- A.Ministry of Earth Sciences
- B.Ministry of Science and Technology
- C.Ministry of Environment, Forest and Climate Change
- D.Ministry of Ports, Shipping and Waterways
tap to reveal answer
Answer: A. Ministry of Earth Sciences
NIOT (Chennai, established 1993) is an autonomous institute under the Ministry of Earth Sciences (MoES) — which also covers IMD, INCOIS, IITM, and NCPOR. The Ministry of Science and Technology has DST/DBT/CSIR but not NIOT. MoEF&CC handles environmental regulation. Ministry of Ports, Shipping and Waterways (formerly Shipping) handles port and inland-waterways infrastructure, not ocean R&D.
India's eastern coastline — particularly the Bay of Bengal — is one of the world's most cyclone-prone regions, accounting for around 80% of all Indian tropical cyclones. The 2004 Indian Ocean tsunami catalysed a structural buildup of ocean-observation capability under MoES — the Indian Tsunami Early Warning System (ITEWS) at INCOIS, the Indian Coastal Ocean Radar Network (ICORN) operated jointly by NIOT and INCOIS, satellite altimetry, BPR instruments, and an expanded Doppler weather-radar network under IMD.
- Densifying the cyclone-warning infrastructureThe Karaikal site closes a gap on the Tamil Nadu-Puducherry stretch of coastline between Cuddalore (existing) and Andhra coastal stations. Each pairing improves near-shore current resolution, which in turn improves storm-surge forecasting — the primary cause of cyclone fatalities in the Bay of Bengal. Better surface-current data also feeds search-and-rescue operations and oil-spill tracking.
- Integration with Mission Mausam and the Blue EconomyMission Mausam (Cabinet-approved 2024) and the Draft Blue Economy Policy (2021) provide the umbrella for further densifying the ICORN network, integrating HF-radar data with Doppler weather radars, satellite altimetry, and Argo-float profiles into a single ocean-state model. The Puducherry-MoES MoU is a state-level template for further coastal MoUs along the eastern seaboard.
- Coastal community livelihoods and last-mile disseminationBetter data must translate into better outcomes at the village level. Last-mile dissemination through SMS-alert systems, vernacular advisories, and the **Sagarmaala Sea Communication and Tracking System** for fishermen needs strengthening. Fishing communities — directly affected by cyclones and rough seas — should be primary beneficiaries of HF-radar data, not just downstream researchers.