science

Radar Doppler Multitarget

Radar Doppler Multitarget 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 Radar Doppler Multitarget rather than just read about it. In short: Radar Doppler Multitarget (RDY in its French acronym) is a multimode Look-down/shoot-down Pulse-Doppler radar designed by Thomson-CSF (now Thales) for the Mirage 2000-5 fighter. The RDY-3 derivative has been fitted to Moroccan Mirage F1s.

Key takeaways

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

Reference excerpt

Radar Doppler Multitarget (RDY in its French acronym) is a multimode Look-down/shoot-down Pulse-Doppler radar designed by Thomson-CSF (now Thales) for the Mirage 2000-5 fighter. The RDY-3 derivative has been fitted to Moroccan Mirage F1s. Thomson has claimed that the original RDY outperformed the AN/APG-66/68 of the F-16 and the AN/APG-65 of the F/A-18 Hornet.

Design The original RDI/RDM radars on the Mirage 2000 only worked in air-to-air mode. The RDY was designed to add air-to-ground modes, in particular the ability to control Exocet and Kormoran 2 anti-shipping missiles. The 240 kg (530 lb) system has a 655 mm (25.8 in) flat-plate antenna scanning a 3.5° beam over a 60° cone at powers up to 120 kW. Maximum range is 60 nmi (110 km) in air-to-air mode and 20 nmi (37 km) in look-down mode. The RDY can detect 24 targets, track eight of them and engage four targets at a time. The enhanced RDY-2 has a slightly greater range and adds a SAR mode.

History Development began in 1984, with the first of nine prototypes flying in July 1987 in a Mystère 20, and the first delivery of a production set in December 1994. RDY is the standard fit on the Mirage 2000–5,-5Mk2 (RDY-2) and -9 (RDY-2) aircraft and has been retrofitted aboard 37 French Air Force Mirage 2000Cs (aircraft to Mirage 2000-5F standard; 11 aircraft redelivered during 1998, 22 during 1999), 25 Greek Mirage 2000-5 Mk2 and 62 United Arab Emirates' Mirage 2000EAD/DADs. Other customers for the Mirage 2000-5 include Qatar (Mirage 2000-5EDA and -5DDA aircraft) and Taiwan (Mirage 2000-5Ei and -5Di aircraft). India's fleet will receive RDY-2 under a €1.47bn contract signed in July 2011 to upgrade them to 2000-5 standard. As part of the MF2000 upgrade, 27 Mirage F1 of the Royal Moroccan Air Force are being fitted with the Thales RC400 (RDY-3 or RDC), a derivative of the RDY with an antenna sized to fit the smaller aircraft.

Specification Frequency:8 to 12 GHz Band: I/J

See also RBE2 - Radar à Balayage Electronique 2, radar on the Rafale

Notes and references

Worked examples

Example 1 — a first encounter with Radar Doppler Multitarget

Start with the simplest possible case. Write down what Radar Doppler Multitarget 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 Radar Doppler Multitarget 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 Radar Doppler Multitarget 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 Radar Doppler Multitarget

In research: Radar Doppler Multitarget 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 Radar Doppler Multitarget 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: Radar Doppler Multitarget is common in secondary-school and first-year university syllabi. It links to neighbouring topics Aircraft radars, Military radars of France, Post–Cold War military equipment of France, so understanding it makes those chapters shorter.
In everyday life: Look for Radar Doppler Multitarget 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 Radar Doppler Multitarget in 20 minutes

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

Frequently asked questions

What is Radar Doppler Multitarget in simple terms?

Why does Radar Doppler Multitarget 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 Radar Doppler Multitarget?

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 Radar Doppler Multitarget.