BharatNotes Overview
Defence Technology is a high-yield topic for UPSC Prelims (factual questions on missiles, organisations, tests) and GS3 Mains (security challenges, indigenisation, technology). Questions often appear in the context of current affairs — a successful missile test or a new defence policy typically triggers a question in the next cycle.
Key areas: DRDO and its projects, India's missile programme, nuclear doctrine and deterrence, anti-satellite capability, and defence indigenisation initiatives.
DRDO — Defence Research and Development Organisation
Establishment and Structure
| Detail | Information |
|---|---|
| Founded | 1958 — formed by amalgamation of the Technical Development Establishment (TDEs) of the Indian Army and the Directorate of Technical Development & Production (DTDP) with the Defence Science Organisation (DSO) |
| Headquarters | DRDO Bhawan, Rajaji Marg, New Delhi |
| Parent Ministry | Ministry of Defence, Government of India |
| Laboratories | Network of 52+ laboratories and establishments (including 5 DRDO Young Scientist Laboratories — DYSLs) |
| Mandate | Design and development of defence systems and technologies for the Indian Armed Forces |
Key DRDO Projects
| Project | Domain | Status |
|---|---|---|
| LCA Tejas | Light Combat Aircraft (single-engine, multirole) | Mk-1A in production by HAL; 180 ordered by IAF. Mk-2 first flight expected mid-2026 |
| Arjun MBT | Main Battle Tank | Mk-1A inducted into Indian Army; features 72 improvements over base variant |
| Kaveri Engine | Indigenous aero-engine (GTRE) | Dry Kaveri variant undergoing flight testing; over 140 hours of cumulative testing completed. Certification targeted for 2026 for Ghatak UCAV |
| INS Arihant Reactor | Nuclear propulsion for SSBN | Reactor achieved criticality; powers India's first indigenous nuclear submarine INS Arihant. Second vessel INS Arighaat commissioned August 2024 |
| ASTRA Missile | Beyond Visual Range Air-to-Air Missile | Current version: range 10–110 km; advanced variants up to 350 km under development |
India's Missile Programme
Integrated Guided Missile Development Programme (IGMDP)
Launched in 1983 under the leadership of Dr APJ Abdul Kalam at DRDO, the IGMDP aimed to develop five indigenous missile systems: Prithvi, Agni, Trishul, Akash, and Nag. The programme was formally concluded in 2008 after successfully achieving its objectives, though development of advanced variants continues.
Mnemonic: "PATAN" — Prithvi, Agni, Trishul, Akash, Nag — the five original IGMDP missiles. This is one of the most frequently tested facts in Prelims.
Comprehensive Missile Table
Ballistic Missiles
| Missile | Type | Range | Propulsion | Key Features |
|---|---|---|---|---|
| Prithvi-I | SRBM (Surface-to-Surface) | 150 km | Liquid fuel | Army version; first IGMDP missile to be developed |
| Prithvi-II | SRBM | 250 km | Liquid fuel | Air Force version |
| Prithvi-III (Dhanush) | SRBM | 350 km | Solid + Liquid | Naval variant; ship-launched |
| Agni-I | SRBM | 700–1,200 km | Solid fuel | Road-mobile; inducted in 2007 |
| Agni-II | MRBM | 2,000–2,500 km | Solid fuel (two-stage) | 20 m long; weighs ~18 tonnes |
| Agni-III | IRBM | 3,000–3,500 km | Solid fuel (two-stage) | Can carry 1.5-tonne warhead |
| Agni-IV | IRBM | ~4,000 km | Solid fuel (two-stage) | Road-mobile; 20 m long |
| Agni-V | ICBM-class | 5,400+ km (reportedly 7,000+ km) | Solid fuel (three-stage) | Canisterised, road-mobile. MIRV-tested in March 2024 (Mission Divyastra) |
| Agni-P (Agni-Prime) | MRBM (new-gen) | 1,000–2,000 km | Solid fuel | Canisterised; first tested June 2021. Replaces Prithvi and Agni-I/II |
Submarine-Launched Ballistic Missiles (SLBMs)
| Missile | Range | Platform | Notes |
|---|---|---|---|
| K-15 Sagarika | 700–750 km | Arihant-class SSBN | India's first operational SLBM |
| K-4 | 3,500 km | Arihant-class SSBN | Extends sea-based deterrence significantly |
Cruise Missiles
| Missile | Type | Range | Speed | Key Features |
|---|---|---|---|---|
| BrahMos | Supersonic cruise missile | Standard: 290 km; Extended Range (ER): 450–500 km (tested 2024); 800 km variant under trials, induction from 2028 | Mach 2.8–3.5 | Indo-Russian JV (BrahMos Aerospace, est. 1998). Tri-service: land, sea, air variants. Named after Brahmaputra + Moskva rivers |
| Nirbhay | Subsonic cruise missile | 800–1,000 km | Subsonic | Stealth features; terrain-hugging flight; 450 kg payload |
Air Defence and Tactical Missiles
| Missile | Type | Range | Key Features |
|---|---|---|---|
| Akash | Surface-to-Air | 30–60 km | Targets aircraft, cruise missiles, and ballistic missiles at altitudes up to 18,000 m. Akash-NG (New Generation) variant under development |
| Nag | Anti-Tank Guided Missile (ATGM) | 4–7 km | Third-generation, fire-and-forget; top-attack capability |
| Shaurya | Surface-to-Surface (hypersonic) | 700–800 km | Canister-launched; Mach 7. Speculated land-based variant of K-15 |
Exam Tip: UPSC often frames questions as "Which of the following statements is/are correct?" about missile characteristics. Remember: Agni-V is three-stage, solid-fuelled, canisterised, and was tested with MIRV capability (Mission Divyastra, 2024). BrahMos is supersonic (not subsonic or hypersonic) and is a joint India-Russia venture.
Nuclear Doctrine
India's Nuclear Tests
| Test | Code Name | Date | Details |
|---|---|---|---|
| Pokhran-I | Smiling Buddha | 18 May 1974 | India's first nuclear test — officially described as a "Peaceful Nuclear Explosion" (PNE). Conducted at the Pokhran test range, Rajasthan |
| Pokhran-II | Operation Shakti | 11 & 13 May 1998 | Five nuclear tests of advanced weapon designs. India declared itself a nuclear weapon state |
Key Elements of India's Nuclear Doctrine
India's nuclear doctrine was outlined through a Draft Nuclear Doctrine (1999) and formalised via a Cabinet Committee on Security (CCS) press release on 4 January 2003. The principal elements are:
- No First Use (NFU): India will not be the first to use nuclear weapons. Nuclear weapons will only be used in retaliation against a nuclear attack on Indian territory or Indian forces anywhere.
- Credible Minimum Deterrence: India maintains the minimum number of nuclear weapons necessary to inflict unacceptable damage in a retaliatory strike.
- Massive Retaliation: Nuclear retaliation to a first strike will be massive and designed to inflict unacceptable damage.
- Non-use against non-nuclear weapon states: India will not use nuclear weapons against states that do not possess them.
- Chemical/Biological caveat: The 2003 operationalisation press note added that nuclear weapons could be used if Indian forces are attacked with biological or chemical weapons.
- Civilian control: The authority to order a nuclear strike rests with the elected civilian leadership — specifically, the Prime Minister through the Nuclear Command Authority.
Nuclear Command Authority (NCA)
| Component | Chair | Role |
|---|---|---|
| Political Council | Prime Minister | The sole body that can authorise a nuclear strike |
| Executive Council | National Security Adviser (NSA) | Provides inputs and executes directives of the Political Council |
| Strategic Forces Command (SFC) | Commander-in-Chief, SFC | Created 4 January 2003; responsible for the management and administration of India's tactical and strategic nuclear weapons |
Nuclear Triad
India completed its nuclear triad — the capability to deliver nuclear weapons from land, air, and sea — with the commissioning of INS Arihant and its first deterrence patrol (announced November 2018).
| Leg | Platform | Delivery System |
|---|---|---|
| Land | Agni series ballistic missiles | Mobile launchers operated by Strategic Forces Command |
| Air | Fighter aircraft (Mirage 2000, Rafale, Jaguar) | Gravity bombs and stand-off weapons |
| Sea | Arihant-class SSBNs (INS Arihant, INS Arighaat) | K-15 and K-4 SLBMs |
Anti-Satellite (ASAT) Test — Mission Shakti
| Detail | Information |
|---|---|
| Date | 27 March 2019 |
| Location | Dr APJ Abdul Kalam Island, Odisha |
| Target | Indian satellite (Microsat-R) in Low Earth Orbit (LEO) at ~283 km altitude |
| Weapon | Three-stage interceptor missile with a hit-to-kill capable Kill Vehicle (KV) equipped with imaging infrared seeker and ring-laser gyroscope INS |
| Significance | India became the 4th country (after USA, Russia, China) to demonstrate ASAT capability |
| Debris concern | Target was in LEO to ensure debris would decay and re-enter the atmosphere within weeks, minimising space debris |
Defence Indigenisation
Make in India in Defence
The government has progressively increased the share of domestic procurement in the defence budget — from 54% in 2018–19 to 68% by 2021–22, with 25% of the procurement budget earmarked for the private sector.
Defence Acquisition Procedure (DAP) 2020
Unveiled by Raksha Mantri in September 2020, the DAP 2020 replaced the earlier Defence Procurement Procedure (DPP). Its highest preference goes to the Buy (Indian-IDDM) category — Indigenously Designed, Developed and Manufactured — and Buy Global is permitted only in exceptional cases with approval of the Defence Acquisition Council (DAC) or Raksha Mantri.
Positive Indigenisation Lists
The Ministry of Defence has notified multiple Positive Indigenisation Lists since 2020, progressively banning the import of defence items that must be sourced domestically:
| List | Date | Number of Items |
|---|---|---|
| 1st List | August 2020 | 101 items |
| 2nd List | May 2021 | 108 items |
| 3rd List | April 2022 | 101 items |
| 4th List | October 2022 (DefExpo) | 101 items |
| 5th List | August 2024 | 346 items |
Key Indigenisation Platforms and Initiatives
| Initiative | Purpose |
|---|---|
| SRIJAN Portal | Launched August 2020. One-stop online portal for vendors to identify items for indigenisation. Over 38,000 items listed; more than 14,000 successfully indigenised (as of early 2025) |
| iDEX (Innovations for Defence Excellence) | Engages startups, MSMEs, R&D institutes, and individual innovators for defence innovation. Over 549 problem statements opened, 430 iDEX contracts signed (as of early 2025) |
| DISC (Defence India Start-up Challenge) | Conducted under iDEX to fund and mentor defence start-ups |
| Defence Industrial Corridors | Two corridors established — Uttar Pradesh (6 nodes: Agra, Aligarh, Chitrakoot, Jhansi, Kanpur, Lucknow) and Tamil Nadu (5 nodes: Chennai, Coimbatore, Hosur, Salem, Tiruchirappalli). 253 MoUs signed with potential investment of over Rs 53,000 crore (as of early 2025) |
Common Mistake: Students often confuse iDEX with DISC. Remember: iDEX is the umbrella framework for defence innovation; DISC (Defence India Start-up Challenge) is a specific programme conducted under iDEX to identify and fund start-up solutions.
Recent Developments (2024–2026)
India's Defence Exports — ₹23,622 Crore in FY 2024–25
India's defence exports reached ₹23,622 crore (approximately $2.8 billion) in FY 2024–25, a record high reflecting over 30-fold growth in a decade. India now exports to around 80 countries (per PIB), with key products including Brahmos cruise missiles (Philippines, other Asian buyers), Pinaka multi-barrel rocket systems (Armenia), Advanced Towed Artillery Gun System (ATAGS), Akash air defence missiles, ammunition, armoured vehicles, fast-attack vessels, and electronics. The private sector contributed ₹15,233 crore (64%) and DPSUs contributed ₹8,389 crore (36%) of total exports.
The government's target is ₹50,000 crore defence exports by 2028–29. The growing export base reduces per-unit production costs, strengthens India's Atmanirbhar Bharat narrative, and creates strategic partnerships with buyer countries.
UPSC angle: Defence exports data (₹23,622 crore FY25, ~80 countries, private sector 64% share), ₹50,000 crore 2028–29 target, and the Atmanirbhar Bharat defence nexus are Prelims and Mains content.
Mission Divyastra — MIRV Capability (March 2024)
Operation Divyastra (March 2024) demonstrated India's Multiple Independently Targetable Re-entry Vehicle (MIRV) capability by successfully testing Agni-V fitted with multiple warheads, each capable of striking separate targets. India joined an exclusive club of nations with MIRV capability (USA, Russia, China, UK, France, and now India). This significantly enhances India's nuclear deterrence by increasing the complexity of any adversary's anti-ballistic missile defence.
Agni-V (range: 5,000–8,000 km) is now MIRV-capable — India's longest-range ICBM-class ballistic missile. This makes India's deterrent against China more credible, particularly given China's rapidly expanding nuclear arsenal and deployment of advanced BMD systems.
UPSC angle: Mission Divyastra, Agni-V MIRV capability, nuclear deterrence implications, and India's nuclear doctrine (No First Use, Credible Minimum Deterrence) are Mains GS-3 content.
AMCA and Zorawar — Key DRDO Development 2024
The Cabinet Committee on Security (CCS) approved the Advanced Medium Combat Aircraft (AMCA) programme in March 2024 at approximately ₹15,000 crore for prototype development. AMCA — India's first indigenous 5th-generation stealth fighter — is being developed by Aeronautical Development Agency (ADA) with Hindustan Aeronautics Limited (HAL) for production. Rollout is planned by 2028, first flight by early 2029.
The Zorawar Light Tank (jointly developed by DRDO and L&T) was unveiled in July 2024 and completed the first phase of developmental field firing trials in September 2024. Designed for high-altitude warfare (Ladakh/Arunachal), Zorawar weighs approximately 25 tonnes — lighter than the Arjun (59 tonnes) — and is capable of deployment by IL-76 air transport. Army user trials are expected once the second prototype is ready. An initial order for 59 tanks has been placed with L&T.
UPSC angle: AMCA (5th-generation fighter, March 2024 CCS approval), Zorawar Light Tank (high-altitude, unveiled July 2024), and India's indigenisation trajectory are Prelims and Mains data.
Integrated Drone Detection and Interdiction System (IDD&IS)
The Indian Army inducted the first batch of the Integrated Drone Detection and Interdiction System (IDD&IS) in March 2024, addressing the emerging threat of armed drones and drone swarms — as demonstrated extensively in the Russia-Ukraine and Israel-Gaza conflicts. IDD&IS uses radar, electro-optical sensors, RF detection, and jamming to detect and neutralise hostile drones in critical zones.
DRDO's Counter-Drone Technology Centre has developed a range of counter-UAS systems including Indrajaal (area denial system for large areas), D4 (Drone Detect, Deter, Destroy) system, and SkyFence electronic jamming systems. The conflict in Ukraine demonstrated that drone countermeasures are now as essential as traditional air defence, making this a rapidly growing defence technology priority.
UPSC angle: Counter-drone technology, IDD&IS induction, DRDO counter-UAS systems, and the lessons from Ukraine for Indian defence technology are Mains GS-3 content.
India's Defence Exports — ₹38,424 Crore Record in FY 2025–26 (April 2026)
India's defence exports reached an all-time high of ₹38,424 crore (approximately $4.6 billion) in FY 2025–26 — a 62.66% jump over FY 2024–25's previous record of ₹23,622 crore, and more than 25-fold growth from ₹1,521 crore in FY 2016–17. India exported to over 80 countries, with the number of exporting companies rising to 145 (from 128 in FY25, a 13.3% increase). Crucially, DPSUs (Defence Public Sector Undertakings) led for the first time, contributing ₹21,071 crore (54.8%), while the private sector contributed ₹17,353 crore (45.2%) — a shift from previous years when private sector led.
Key export products include BrahMos cruise missiles (Philippines, with more Asian buyers in pipeline), Pinaka Multi-Barrel Rocket Launcher systems, Akash Surface-to-Air Missile systems, Advanced Towed Artillery Gun System (ATAGS), Light Combat Helicopter, ammunition, armoured vehicles, and fast patrol vessels. The government's target remains ₹50,000 crore in defence exports by 2028–29, with the FY26 achievement placing India well on track.
UPSC angle: FY26 defence export record (₹38,424 crore, 62.66% growth, 80+ countries, 145 exporters), DPSU-led shift, BrahMos as flagship export, and the ₹50,000 crore 2028–29 target are high-priority Prelims and Mains GS-3 data points.
Important for UPSC
Prelims Focus Areas
- Names, ranges, and types of missiles (especially Agni series, BrahMos, K-series SLBMs)
- DRDO: establishment year (1958), key labs and projects
- Mission Shakti: year (2019), India became 4th ASAT nation
- Nuclear tests: Pokhran-I (1974, Smiling Buddha), Pokhran-II (1998, Operation Shakti)
- IGMDP: launched 1983, led by Dr APJ Abdul Kalam, five missiles (PATAN)
- Defence indigenisation initiatives: iDEX, SRIJAN, Defence Industrial Corridors (UP and TN)
Mains Dimensions (GS3 — Internal Security / Science & Technology)
- Strategic deterrence: Evaluate the effectiveness of India's No First Use doctrine and credible minimum deterrence in the current geopolitical context
- Indigenisation vs imports: Analyse the trade-offs between self-reliance and operational readiness. Discuss the role of DAP 2020 and positive indigenisation lists
- Technology self-reliance: Examine how initiatives like iDEX, DISC, and Defence Industrial Corridors contribute to Atmanirbhar Bharat
- Emerging threats: Hypersonic missiles, space warfare (ASAT), cyber warfare — new frontiers of defence technology
Interview Angles
- Should India revise its No First Use policy?
- How can India balance the need for cutting-edge technology with budget constraints?
- The role of private sector and start-ups in defence manufacturing
Current Affairs Connect
Defence technology is a frequently tested current affairs topic. New missile tests, defence deals, indigenisation milestones, and policy changes appear regularly in Prelims and Mains.
Stay updated with the latest defence developments on Ujiyari.com — our complementary current affairs portal covers defence news with UPSC-specific analysis.
Vocabulary
Ballistic
- Pronunciation: /bəˈlɪs.tɪk/
- Definition: Relating to projectiles that move under their own momentum, gravity, and aerodynamic drag after an initial powered phase, following a curved trajectory without sustained propulsion.
- Origin: From Latin ballista ("a military siege engine for throwing stones") + -ic, ultimately from Greek ballein ("to throw"); first used in English in the mid-18th century, with the missile-related sense emerging in 1949.
Supersonic
- Pronunciation: /ˌsuː.pəˈsɒn.ɪk/
- Definition: Travelling at a speed greater than the speed of sound in the same medium (approximately 343 metres per second or Mach 1 in air at sea level).
- Origin: From Latin super- ("above") + sonus ("sound") + -ic; first recorded in 1919, originally meaning "relating to sound waves beyond human hearing," but by 1934 it described speeds exceeding the speed of sound, with ultrasonic taking the earlier meaning.
Stealth
- Pronunciation: /stɛlθ/
- Definition: In military technology, the design philosophy and suite of techniques used to make aircraft, missiles, ships, or vehicles less detectable by radar, infrared sensors, and other surveillance systems.
- Origin: From Middle English stelthe ("theft, secret action"), from Old English stǣlþ, related to stelan ("to steal"); the military-technology sense emerged in the 1980s as radar-evading aircraft design advanced.
Key Terms
BrahMos Missile
- Pronunciation: /ˈbrɑː.moːs ˈmɪs.aɪl/
- Definition: A supersonic cruise missile developed as a joint venture between India's DRDO and Russia's NPO Mashinostroyeniya (now NPO Mash), capable of being launched from land, sea, air (Su-30MKI), and submarine platforms at speeds of Mach 2.8 to 3.5 in a steep dive, with a range extended to up to 650 km (original: 290 km, extended after India joined the Missile Technology Control Regime/MTCR in 2016). It is the world's fastest supersonic cruise missile currently in operational service, featuring a two-stage propulsion system (solid booster + liquid ramjet sustainer) and a fire-and-forget capability with terminal manoeuvrability that makes it extremely difficult to intercept.
- Context: Named as a portmanteau of the Brahmaputra River (India) and the Moskva River (Russia), symbolising the bilateral partnership. BrahMos Aerospace Pvt. Ltd. was established on 12 February 1998 as a joint venture (India holds 50.5%, Russia 49.5%), with the missile first flight-tested on 12 June 2001. Key milestones: first air-launch from Su-30MKI (November 2017), first export contract to the Philippines ($375 million, January 2022). BrahMos-II, a hypersonic variant targeting Mach 7+ speed, is under development. The BrahMos Extended Range version (650 km) became possible after India's accession to MTCR in June 2016, which removed the 300 km range cap.
- UPSC Relevance: GS3 (Science & Technology / Defence). Prelims tests BrahMos specifications -- supersonic speed (Mach 2.8-3.5), range (up to 650 km), multi-platform capability (land, sea, air, submarine), India-Russia joint venture (BrahMos Aerospace, 1998), and distinction between cruise missiles (sustained propulsion, fly low to evade radar) and ballistic missiles (unpowered arc after initial boost). Mains asks about defence indigenisation under Atmanirbhar Bharat, BrahMos export to the Philippines (India's largest defence export deal), and India's missile technology capabilities in the context of strategic deterrence and MTCR membership (2016).
DRDO
- Pronunciation: /diː.ɑːr.diː.əʊ/
- Definition: The Defence Research and Development Organisation, India's premier military research and development agency under the Ministry of Defence, responsible for designing and developing defence systems and technologies for the Indian Armed Forces through a network of 41 laboratories and 5 DRDO Young Scientist Laboratories (DYSLs). Its mandate covers aeronautics, armaments, electronics, combat vehicles, missiles, naval systems, materials, CBRN defence, and life sciences.
- Context: Formed in 1958 by amalgamating the Technical Development Establishments (TDEs) of the Indian Army and the Directorate of Technical Development and Production (DTDP) with the Defence Science Organisation (DSO). Headquartered at DRDO Bhawan, Rajaji Marg, New Delhi. Key landmark projects: Integrated Guided Missile Development Programme (IGMDP, 1983, under Dr. A.P.J. Abdul Kalam -- developed Prithvi, Agni, Trishul, Akash, NAG; declared complete in 2008), LCA Tejas (4.5-generation fighter, inducted 2016), Arjun MBT (third-generation tank), INS Arihant nuclear reactor (powers India's nuclear submarine fleet), and Mission Shakti (anti-satellite test, 27 March 2019 -- India destroyed a live LEO satellite at 283 km altitude, becoming the fourth country with ASAT capability after US, Russia, and China). Defence exports have grown from Rs 1,521 crore (FY 2017) to over Rs 21,000 crore (FY 2024).
- UPSC Relevance: GS3 (Science & Technology / Defence). Prelims tests DRDO's founding year (1958), parent ministry (Defence, not Science & Technology), key products (Agni missiles, Tejas LCA, Arjun MBT, Kaveri engine, BrahMos -- note BrahMos is a joint venture, not solely DRDO), IGMDP (1983, Dr. Kalam, five missiles), and Mission Shakti (ASAT test, March 2019). Mains asks about defence indigenisation under Atmanirbhar Bharat (positive import lists, SRIJAN portal, iDEX for startups), DRDO's role in self-reliance vs criticism of delays and cost overruns, defence export growth, and the balance between indigenous R&D and technology imports (e.g., Rafale vs Tejas debate).
Sources
- DRDO Official Website
- Press Information Bureau — Ministry of Defence releases
- Ministry of Defence — Defence Acquisition Procedure
- BrahMos Aerospace Official Website
- PRS Legislative Research
- M. Laxmikanth, Indian Polity (7th Edition) — for Nuclear Command Authority structure
- Rajesh Singh, Indian Economy — for defence budget and indigenisation context
