Enter your Target Shape, Radar Frequency, Primary and Secondary Dimensions, Grazing Angle, and Polarization to calculate the Radar Cross Section of an object — plus get the RCS in dBsm, Wavelength, and Relative Detection Range to understand just how visible (or stealthy) your target really is.
Radar Cross Section
--
RCS (dBsm)
--
Wavelength
--
Relative Detection Range
--
Radar cross section is a measure of how detectable an object is by radar. It represents the effective area that would reflect the same amount of radar energy back to the receiver as the actual target. Higher RCS values mean the target is more easily detected.
Different geometric shapes have distinct RCS characteristics. Spheres provide omnidirectional scattering, cylinders have aspect-dependent returns, flat plates create strong specular reflection, and corner reflectors maximize backscatter in specific directions.
Radar frequency affects the wavelength, which determines how electromagnetic waves interact with the target. The relationship between target size and wavelength influences scattering behavior, with different frequency regimes (Rayleigh, Mie, optical) producing different RCS characteristics.
Grazing angle is the angle between the radar beam and the target surface. It significantly affects the reflected signal strength, with perpendicular angles typically producing maximum returns and shallow angles reducing detectability.
dBsm (decibels relative to square meter) is a logarithmic scale for RCS. 0 dBsm equals 1 m², while negative values represent smaller cross sections. Each -10 dBsm represents a 10-fold decrease in effective reflecting area.
Besides RCS, detection depends on radar power, antenna gain, receiver sensitivity, range to target, atmospheric conditions, clutter, and signal processing techniques. RCS is just one component in the radar equation.
Simple geometry calculations provide good approximations for basic shapes but real-world targets are more complex. These calculations are useful for initial estimates, system design, and educational purposes, but detailed analysis may require sophisticated modeling software.
Yes, RCS can be modified through stealth technology (shape design, radar-absorbing materials) to reduce detectability, or enhanced using corner reflectors and augmentors to increase visibility for navigation aids and rescue beacons.