science

Type 515 Radar

Type 515 Radar 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 Type 515 Radar rather than just read about it. In short: Type 515 radar is a Chinese 2-D air search radar in service with both Chinese Ground Force (PLAGF) and Chinese navy (PLAN). The radar has been retired from active service, being replaced by more advanced radars such as Type 517 on PLAN destroyers.

Key takeaways

Type 515 Radar belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Type 515 Radar to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Type 515 Radar from memory before moving on to harder problems.

Reference excerpt

Type 515 radar is a Chinese 2-D air search radar in service with both Chinese Ground Force (PLAGF) and Chinese navy (PLAN). The radar has been retired from active service, being replaced by more advanced radars such as Type 517 on PLAN destroyers. Originally developed as a land-based 2-D air search radar, Type 515 radar only provides range and bearing, and a separate altitude finding radar is needed to provide altitude information of targets, thus completing the complete air defense radar system. However, due to space limitation, the altitude radar is not installed onboard Type 051 destroyers. Type 515-Jia (甲) is the first radar that utilizes semiconductors, with design work begun in May 1967. Preliminary design was submitted in December 1967 and approved in January of the following year. First sample was completed in 1969 and passed tests on land in August 1970, and sea trials begun in the following month. However, it was discovered in sea trials that the hydraulic stabilization system was prone to malfunctions and the size of the antenna was too large that it blocked the coverage of 57 mm gun. On April 21, 1971, it was decided to delete the hydraulic stabilization system and change the size of antenna, resulting in Type 515-Yi (乙). After three years of side-by-side service of both models, Chinese navy decided in October 1975 to adopt Type 515-Jia, but with huge design changes, mainly aimed to improve reliability and stability. The redesigned radar was completed in June 1976, and sea trials were completed in April 1981. In May 1982, the design was finalized and certification was received three month later in August of the same year. Type 515 radars were installed on Type 051 destroyers but have since been replaced by Type 517 radars. Specification:

Band: A Beam: 25° - 30° Pulse width: 30 nanosecond PRF: 400 – 445 pps

See also Chinese radars Naval Weaponry of the People's Liberation Army Navy

References

Worked examples

Example 1 — a first encounter with Type 515 Radar

Start with the simplest possible case. Write down what Type 515 Radar 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 Type 515 Radar 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 Type 515 Radar 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 Type 515 Radar

In research: Type 515 Radar 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 Type 515 Radar 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: Type 515 Radar is common in secondary-school and first-year university syllabi. It links to neighbouring topics Chinese military stubs, Military radars of China, Sea radars, so understanding it makes those chapters shorter.
In everyday life: Look for Type 515 Radar 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 Type 515 Radar in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Type 515 Radar 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 Type 515 Radar out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Type 515 Radar in simple terms?

Why does Type 515 Radar 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 Type 515 Radar?

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 Type 515 Radar.