What do you mean by radar cross section explain RCS of the sphere?

What do you mean by radar cross section explain RCS of the sphere?

The radar cross section (RCS) of a target is the equivalent area seen by a radar. It is the fictitious area intercepting that amount of power which, when scattered equally in all directions, produces an echo at the radar equal to that from the target.

What is RCS reduction?

Abstract: Reduction of radar cross sections (RCS) is one of the major problems in stealth technology. Basic techniques used for RCS reduction are well known. They involve appropriate shaping, use of radar absorbing materials (RAMs), and passive and active cancellation of the scattered jield.

What is radar cross section what is its significance?

The Radar Cross-Section of a target is the area that intercepts the radar’s transmitted signals and reflects them back to the radar receiver. When a radar pulse is transmitted by a transmitter, it hits the target and gets scattered isotropically and only some part of it bounces back to the receiver.

How is radar cross section measure?

Radar cross section RCS is the measure of an object’s ability to reflect radar signal in the direction of the radar receiver i.e. it is the measure of the ratio of backscatter per steradian (unit solid angle) in the direction of the radar (from the target) to the power density that is intercepted by the target.

Does RCS depend on frequency?

The RCS of a target depends on the aspect angle, frequency, and polarization. When the object dimension is much greater than the wavelength, the RCS of a conducting plate with a physical area A observed at the normal direction can be approximated by the product of the effective gain of the plate and the physical area.

How is radar cross section measured?

What is the advantage of high PRF mode?

An advantage of a high-prf pulse doppler radar is that it can readily detect targets with a high relative-velocity since such echoes do not compete with the echoes from clutter that are at lower doppler frequencies.

What are the advantages of staggered PRF?

Staggered PRF The change of repetition frequency allows the radar, on a pulse-to-pulse basis, to differentiate between returns from its own transmissions and returns from other radar systems with the same PRF and a similar radio frequency.

Does plastic reflect radar?

Certain plastics absorb electromagnetic radiation in the radio frequency range, instead of reflecting it. These types of materials are invisible to radar. The “stealth” technology employed on American aircraft make use of these types of materials, as coating on top of the metallic frame of the aircraft.

How to reduce the radar cross section of a target?

If the RCS was directly related to the target’s cross-sectional area, the only way to reduce it would be to make the physical profile smaller. Rather, by reflecting much of the radiation away or by absorbing it, the target achieves a smaller radar cross section.

How can the RCS of a stealth aircraft be reduced?

Modern stealth aircraft are said to have an RCS comparable with small birds or large insects, though this varies widely depending on aircraft and radar. If the RCS was directly related to the target’s cross-sectional area, the only way to reduce it would be to make the physical profile smaller.

What determines the RCS of an aircraft?

The RCS of an aircraft depends on its aspect, the orientation of the target to the radar source. Any aircraft will have a smaller RCS from the front, and show-up bigger from the side or the rear. Looking at the table values, their numbers seem to be based on the frontal aspect, the lowest RCS of the aircraft.

Why do fighter jets have the largest RCS from the rear?

Also, some fighter jets have their largest RCS from the rear, due to the exhaust nozzles. And, RCS depends on the wavelength (frequency) of the radar signal and how far away the target is. But we’ll ignore these pesky details for now.