science

KLJ-7

KLJ-7 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 KLJ-7 rather than just read about it. In short: The KLJ-7, also referred to as the Type 1478, is an X band airborne fire-control radar (FCR) developed by Nanjing Research Institute of Electronics Technology (NRIET), also known as the China Electronics Technology Company's (CETC's) No. 14 Research Institute. In December 2010, the Pakistan Air Force's Air Chief Marshal Rao Qamar Suleman announced that the KLJ-7 radar will be produced at the Pakistan Aeronautical Co…

Key takeaways

KLJ-7 belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect KLJ-7 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of KLJ-7 from memory before moving on to harder problems.

Reference excerpt

The KLJ-7, also referred to as the Type 1478, is an X band airborne fire-control radar (FCR) developed by Nanjing Research Institute of Electronics Technology (NRIET), also known as the China Electronics Technology Company's (CETC's) No. 14 Research Institute. In December 2010, the Pakistan Air Force's Air Chief Marshal Rao Qamar Suleman announced that the KLJ-7 radar will be produced at the Pakistan Aeronautical Complex (PAC) in Kamra.

Development and design The KLJ-7 uses a mechanically steered planar array antenna and bears similarities with the various Russian radars imported in the 1990s. Russian radar design houses Phazotron and NIIP had worked closely in the past with the Chinese radar design bureaus and provided technical assistance as well as operational models of Russian-made radar sets that were used as benchmarks in the process of these Chinese firms developing their own design. Up to 20 units of the Phazotron Zhemchoug ('Pearl) radar were imported in the mid-1990s for evaluation along with 2 units of Phazotron (NIIR) RP-35, The KLJ-7V1 has multiple modes, both beyond visual range (BVR) and close-in air-to-air modes, ground surveillance modes and anti-jamming capability. The radar can reportedly manage up to 40 targets, monitor up to 10 of them in track-while-scan (TWS) mode and simultaneously fire on two BVR targets. The detection range for targets with a radar cross-section of 3 square meters is stated to be ≥75 km (≥35 km in look-down mode). Surface sea targets can be detected at up to 135 km. Most modern Chinese air-launched weapons, such as the short-range PL-9C and the beyond-visual-range PL-12 (SD-10) air-to-air missiles are supported by the KLJ-7. It has been reported that KLJ-7 also has modes to support a range of NATO weaponry. According to a Pakistan Aeronautical Complex programme officer, after having "flown with this radar" as well as "other models... such as the Thales RC400" and evaluating them for the JF-17 lightweight fighter, the Chinese radar is "every bit as capable as its contemporary analogues." A more powerful model, called the KLJ-7V2, has been produced.

Radar modes Data from: Janes Defence

Range While Search (RWS) Velocity Search (VS) Single Target Track (STT) Track While Scan (TWS) Dual Target Track (DTT) Situational Awareness Mode (SAM) Air Combat Mode (ACM)(with five sub-modes) Real Beam Map (RBM) Doppler Beam Sharpening (DBS) Ground Moving Target Indication/Ground Moving Target Track (GMTI/GMTT) Air to Ground Ranging (AGR) Synthetic Aperture Radar (SAR) Sea Single Target Track (SSTT) Beacon (BCN)

Specifications Data from: JF-17 official website

Frequency: X band Range: Look-up: >105 km (for RCS of 5m2) (V1) or 200 km (for RCS of 5 m2) (V2), Look-down: >85 km (for RCS of 5m2) (V1) or V2 Total targets tracked: 10 in TWS (Track-While-Scan) mode (V1) Reliability: MTBF (Mean Time Between Failure): 220 hours MTTR (Mean Time To Recovery): 0.5 hours Weight: ≤120 kg Volume: 0.065 m3

See also FC-1 Xiaolong / JF-17 Thunder List of radars

References

External links China's NRIET outlines fighter radar improvements

Illustrations

Worked examples

Example 1 — a first encounter with KLJ-7

Start with the simplest possible case. Write down what KLJ-7 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 KLJ-7 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 KLJ-7 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 KLJ-7

In research: KLJ-7 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 KLJ-7 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: KLJ-7 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Aircraft radars, Aviation in China, Military equipment introduced in the 2000s, so understanding it makes those chapters shorter.
In everyday life: Look for KLJ-7 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “KLJ-7” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study KLJ-7 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what KLJ-7 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 KLJ-7 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is KLJ-7 in simple terms?

Why does KLJ-7 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 KLJ-7?

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 KLJ-7.