science

Nilesh M. Desai

Nilesh M. Desai is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Nilesh M. Desai rather than just read about it. In short: Nilesh M. Desai (born 1 April 1964) is an Indian engineer and space scientist, and the former director of the Space Applications Centre (SAC) in Ahmedabad, a research facility under the Indian Space Research Organisation (ISRO).

Key takeaways

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Reference excerpt

Nilesh M. Desai (born 1 April 1964) is an Indian engineer and space scientist, and the former director of the Space Applications Centre (SAC) in Ahmedabad, a research facility under the Indian Space Research Organisation (ISRO). Desai's work includes contributions to microwave radar systems, the Indian Regional Navigation Satellite System, quantum key distribution, and lunar exploration missions such as Chandrayaan-3.

Early life and education Desai was born on 1 April 1964 in Navsari, Gujarat He earned his Bachelor of Engineering degree (B.E) from the L.D. College of Engineering (LDCE) in Gujarat. In 2023, Desai was awarded an honorary Doctor of Science degree by Bundelkhand University and in 2024 he was conferred with an honorary doctorate degree by the Gujarat Technological University (GTU).

Career in Indian Space Research Organisation Desai joined ISRO in 1986, initially working at SAC in ISRO's Microwave Remote Sensing Programme (MRSP). In his thirty-six years career at SAC, he has been involved in design and development of ISRO's Microwave Radar Systems, and realization of advanced applications involving earth observation, navigation and communication technologies for societal benefits, governance and strategic uses. He has successfully led the design and development of ISRO's airborne & Spaceborne Microwave Remote Sensing Payloads like including the RISAT-1 C-Band Synthetic-aperture radar (SAR), Oceansat-2, ScatSat-1, the Chandrayaan-2 Orbiter SAR, and systems related to Chandrayaan-3. He also played a role in realizing the NASA-ISRO Synthetic Aperture Radar, or NISAR satellite, a partnership between NASA and ISRO. Desai's technical expertise extends to VLSI and semiconductor manufacturing, and he was involved in developing satellite-based quantum key distribution systems at ISRO. Desai was appointed the director of Space Applications Centre in 2021, overseeing research and development of satellite applications in communication, navigation, and earth observation. He Superannuated on 31 Mar 2026.

Indian Regional Navigation Satellite System

The Indian Regional Navigation Satellite System (IRNSS), named with the acronym NavIC (Navigation with Indian Constellation; also, nāvik 'sailor' or 'navigator' in Indian languages), is a regional satellite navigation system that provides accurate real-time positioning and timing services. It covers Indian mainland and regions extending 1,500 km (930 mi) around it, with plans for further extension up to 3,000 km (1,900 mi). The system currently consists of a constellation of eight satellites, with two additional satellites on ground as stand-by. The constellation is in orbit since 2018. NavIC will provide two levels of service, the "standard positioning service", which will be open for civilian use, and a "restricted service" (an encrypted one) for authorised users (including the military). Nilesh Desai as a deputy director at Space Applications Centre was responsible for the design & development of different types of real time data processing techniques, User Receivers for indigenous NavIC satellites. In a press interaction Desai mentioned that once NavIC will be fully operational, it will greatly benefit both the military and the general public. He pointed out that at present, locating a missing soldier can be quite challenging; however, once NavIC is operational, this can be much easier to address. A wristwatch-like device designed in Space Applications Centre will be provided to soldiers, which will continuously track and relay their location. Once this indigenously developed system will be operational, India will not need to rely on any foreign technology.

Chandrayaan 2

Chandrayaan-2 is the second lunar exploration mission developed by ISRO after Chandrayaan-1. The main scientific objective of the mission was to map and study the variations in lunar surface composition, as well as the location and abundance of lunar water. The preliminary configuration study of the lander was completed in 2013 during the tenure of Desai as deputy director by the Space Applications Centre (SAC) in Ahmedabad. This includes three major payloads and a crucial set of sensors and communication equipment that will be fitted on to the orbiter, lander and the rover. Chandrayaan-2 had three parts consisting of a lunar orbiter, lander and the rover. SAC developed communication equipment to help the rover interact with the lander while moving around on the moon's surface. Thus the lander can communicate to the orbiter and the orbiter can beam back the data to the earth.

Chandrayaan 3

Chandrayaan-3 is the third Indian mission in the Chandrayaan programme, a series of lunar-exploration missions developed by ISRO.The mission consists of Vikram, a lunar lander, and Pragyan, a lunar rover, as replacements for the equivalents on Chandrayaan-2. Under the leadership of Desai, Space Applications Centre (SAC) played a major role in developing several critical instruments for the Chandrayaan-3 mission, including the Alpha Particle X-ray Spectrometer (APXS) on the lander, the ChaSTE (Chandra's Surface Thermophysical Experiment) payload to measure lunar soil temperature, and the RAMBHA-LP (Radio Anatomy of Moon Bound Hypersensitive ionosphere and Neutral Composition–Langmuir Probe). SAC also played critical role in the landing process. The centre has developed a number of sensors on board the lander, including the hazard detection and avoidance camera and processing algorithm, which has helped safe and soft landing.

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Illustrations

Worked examples

Example 1 — a first encounter with Nilesh M. Desai

Start with the simplest possible case. Write down what Nilesh M. Desai claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Nilesh M. Desai before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Nilesh M. Desai ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Nilesh M. Desai

In research: Nilesh M. Desai appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Nilesh M. Desai in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Nilesh M. Desai is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1964 births, ISRO people, Indian space scientists, so understanding it makes those chapters shorter.
In everyday life: Look for Nilesh M. Desai outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Nilesh M. Desai in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Nilesh M. Desai means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
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Frequently asked questions

What is Nilesh M. Desai in simple terms?

Why does Nilesh M. Desai matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Nilesh M. Desai?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Nilesh M. Desai.