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 41 laboratories + 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 Up to 650 km 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:

  1. 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.
  2. Credible Minimum Deterrence: India maintains the minimum number of nuclear weapons necessary to inflict unacceptable damage in a retaliatory strike.
  3. Massive Retaliation: Nuclear retaliation to a first strike will be massive and designed to inflict unacceptable damage.
  4. Non-use against non-nuclear weapon states: India will not use nuclear weapons against states that do not possess them.
  5. 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.
  6. 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 in Low Earth Orbit (LEO) at ~300 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

AMCA — Advanced Medium Combat Aircraft

India's 5th-generation stealth fighter programme, jointly pursued by ADA, HAL, and DRDO. The CCS approved the project (approximately Rs 15,000 crore for prototype development) in March 2024. A full-scale engineering model was displayed at Aero India 2025. Rollout is planned by 2028 and first flight by early 2029.

Project 75I — Next-Generation Submarines

The Indian Navy's programme to acquire six conventional submarines with Air-Independent Propulsion (AIP). Germany's TKMS was selected and entered contract negotiations with Mazagon Dock Shipbuilders Ltd (MDL) in September 2025. The contract is expected to be finalised by March 2026, with the first submarine delivery projected around 2032.

HSTDV — Hypersonic Technology Demonstrator Vehicle

DRDO successfully demonstrated scramjet technology through the HSTDV programme. Building on this, the ET-LDHCM (Long Duration Hypersonic Cruise Missile) has been tested, and the Dhvani hypersonic glide vehicle programme is progressing, with initial flight trials expected in 2027–28.

S-400 Triumf Air Defence System

India signed a deal with Russia in 2018 for five S-400 squadrons. Three squadrons have been delivered. The fourth squadron is expected by mid-2026 and the fifth by 2027.

Mission Divyastra (March 2024)

Agni-V was successfully tested with MIRV (Multiple Independently Targetable Re-entry Vehicle) technology, enabling a single missile to deliver multiple warheads to separate targets — a significant enhancement of India's nuclear deterrent.

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