science

PSLV C7

PSLV C7 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 PSLV C7 rather than just read about it. In short: PSLV-C7 was a mission of the Indian Polar Satellite Launch Vehicle (PSLV) rocket, launched on January 10, 2007, by the Indian Space Research Organisation (ISRO) from the Satish Dhawan Space Centre at Sriharikota, Andhra Pradesh. The mission consisted of Space Capsule Recovery Experiment, ISRO's first reentry mission, along with Cartosat-2, an Earth observation satellite, LAPAN-TUBsat, Indonesia's first remote sensin…

Key takeaways

PSLV C7 belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect PSLV C7 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of PSLV C7 from memory before moving on to harder problems.

Reference excerpt

PSLV-C7 was a mission of the Indian Polar Satellite Launch Vehicle (PSLV) rocket, launched on January 10, 2007, by the Indian Space Research Organisation (ISRO) from the Satish Dhawan Space Centre at Sriharikota, Andhra Pradesh. The mission consisted of Space Capsule Recovery Experiment, ISRO's first reentry mission, along with Cartosat-2, an Earth observation satellite, LAPAN-TUBsat, Indonesia's first remote sensing satellite, and Pehuensat-1, an Argentine educational satellite. The mission was an important mission is the history of PSLV, because it had many new additions to the rocket. The mission also had the first use of Dual Launch Adapter, (DLA).

Speciality and Major Changes First reentry Experiment of ISRO Altitude based Day of Launch (DOL) wind biased steering program during Open Loop Guidance Deletion of SITVC system of airlit strap-on. PS1 SITVC Injectant loading reduced by 500 kg. Use of externally fabricated nozzles for the two motors. Use of Dual Launch Adapter (DLA) First use of 2 ton liquid stage for fourth stage. Video Imaging System to capture payloads (Cartosat-2 & SRE) and DLA separation events. Internal vehicle length increased by 2.25 m with the Introduction of DLA. Flight sequence modified for multiple satellite/DLA separation.

Launch This was the tenth Launch of the PSLV rocket. It launched at 03:53 UTC on January 10, 2007, from Sriharikota.

The first stage, of six solid propellant strap-ones, of HTPB fuel, ignited at Launch. They burned for 113 seconds and got disposed. The second stage of UH 25 and N2O4 fuel, got ignited at 113 seconds. This was followed by a Heat shield separation and separation of PS2 at 264 seconds. PS3 ignited at 265 seconds and separated at 513 seconds. PS4 ignited at 533 seconda and cut off at 942 seconds. Cartosat-2 separated at 979 seconds at an altitude of 639 km. Dual Launch Adapter separated at 1024 seconds SRE separated at 1099 seconds at 641 km altitude. LAPAN-TUBsat separated at 1169 seconds at an altitude of 642 km.

Payloads

SRE

The Space Capsule Recovery Experiment (SCRE or more commonly SRE or SRE-1) is an Indian experimental spacecraft. It's the first step in their Gaganyaan program of ISRO which aim to send humans to space. It orbited the Earth for 12 days before re-entering the Earth's atmosphere and splashing down into the Bay of Bengal at 04:16 UTC on January 22. It also did Research on reusable Thermal Protection System, navigation, guidance and control, hypersonic aero-thermodynamics, management of communication blackout, deceleration and flotation system and tested recovery operations.

Cartosat-2 Cartosat-2 is an Earth observation satellite in a Sun-synchronous orbit and the second of the Cartosat series of satellites. It consists of a panchromatic (PAN) camera that take black and white pictures of the Earth in the visible region of the electromagnetic spectrum. It can produce images 1 metre in resolution.

LAPAN-TUBsat and Pehuensat-1 Pehuensat-1 is an Argentinian amateur Radio satellite created by students of Universidad Nacional del Comahue. LAPAN-TUBsat is an Indonesian micro satellite, weighing 56 Kilograms, orbiting at 630 kilometers above Indonesia. This satellite travels through polar orbit across the archipelago two or three times each day.

Dual Launch Adapter

It's an adapter designed to carry medium class (~1000 kg) payloads in PSLV. It consists of a Carbon Fibre composite, arranged in Honeycomb sandwich shells. With an aluminum core. It consists of three structures, DLA-U (upper), DLA-M (middle), and DLA-L (lower). DLA is mounted of the fourth stage of PS4, by bolting the DLA-L with Payload Adapter (PLA). DLA-U carries Cartosat-2, and SRE is connected to PLA via a band clamp separation system. DLA includes cutouts in which electrical connectors, sensors, cooling system of the satellite etc. can be mounted.

Reactions and Honours

Team of ISRO scientists who were part of the mission were awarded the prestigious team achievement award of the International Academy of Astronautics. The award was given to them at Glasgow, on September 28. ISRO Chairman Madhavan Nair told the press "We've done it perfectly", after the launch. Dr V Jayaraman, director, earth observation system, said "We believe we can offer our products at one-fifth of the cost of our competitors, The size of the international market (for such images) is about $300 million-$500 million."

Team The PSLV-C7 team was led by

N Narayana Murthy, Project Director, Cartosat-2 George Koshy, Vehicle Director, PSLV-C7 Cartosat-2 by M Krishnaswamy, Programme Director, IRS. SRE-1 by A Subramoniam Ground support team by S K Shivakumar, Director, ISTRAC. Overall co-ordination by P S Sastry, Director, LVPO at ISRO Headquarters, Bangalore.

References

Illustrations

PSLV C7: Dual Launch Adapter can be used to integrate 2 or more satellites on a single Launch. Note: This shows the DLA from the later PSLV-C40 mission — Dual Launch Adapter can be used to integrate 2 or more satellites on a single Launch. Note: This shows the DLA from the later PSLV-C40 mission

Worked examples

Example 1 — a first encounter with PSLV C7

Start with the simplest possible case. Write down what PSLV C7 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 PSLV C7 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 PSLV C7 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 PSLV C7

In research: PSLV C7 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 PSLV C7 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: PSLV C7 is common in secondary-school and first-year university syllabi. It links to neighbouring topics 2007 in India, 2007 in spaceflight, Polar Satellite Launch Vehicle, so understanding it makes those chapters shorter.
In everyday life: Look for PSLV C7 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 PSLV C7 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what PSLV C7 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.
Explain PSLV C7 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is PSLV C7 in simple terms?

Why does PSLV C7 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 PSLV C7?

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 PSLV C7.