Radar Cross Section Calculator
Calculate target radar cross section (RCS in m² and dBsm) from transmit power, receiver power, range, frequency, and antenna gain using the monostatic radar equation.
6
Inputs
Live
Math
3
Related
Enter parameters and click Calculate to view results
Formula & Theory
σ = P_r · (4π)³ · R⁴ / (P_t · G_t · G_r · λ²) | σ(dBsm) = 10 log₁₀(σ)This formula is used to calculate antenna parameters for radar cross section calculator.
Overview
Radar Cross Section helps you calculate design values for a radar engineering project from Peak Transmit Power (P_t), Transmit Antenna Gain (G_t), Receive Antenna Gain (G_r) [Equal to G_t for Monostatic], Operating Frequency (f), Target Range (R), Measured Received Echo Power (P_r). Calculate target radar cross section (RCS in m² and dBsm) from transmit power, receiver power, range, frequency, and antenna gain using the monostatic radar equation. Use the result to make an informed first design decision before choosing hardware, setting dimensions, or evaluating the RF system in its final environment.
Input Guide
Enter Peak Transmit Power (P_t), Transmit Antenna Gain (G_t), Receive Antenna Gain (G_r) [Equal to G_t for Monostatic], Operating Frequency (f), Target Range (R), Measured Received Echo Power (P_r) exactly in the units shown by this radar cross section. Check the operating band, unit prefix, and decimal position before calculating; these are the inputs used by the formula.
- Peak Transmit Power (P_t) — use W.
- Transmit Antenna Gain (G_t) — use dBi.
- Receive Antenna Gain (G_r) [Equal to G_t for Monostatic] — use dBi.
- Operating Frequency (f) — use GHz.
- Target Range (R) — use km.
- Measured Received Echo Power (P_r) — use dBm.
Output Guide
The results describe the calculated radar cross section values for the inputs you entered. Check each value against the available space, selected components, feed system, and operating conditions before making a final design decision.
How This Calculator Works
The Radar Cross Section uses σ = P_r · (4π)³ · R⁴ / (P_t · G_t · G_r · λ²) | σ(dBsm) = 10 log₁₀(σ). Supply Peak Transmit Power (P_t) (W), Transmit Antenna Gain (G_t) (dBi), Receive Antenna Gain (G_r) [Equal to G_t for Monostatic] (dBi), Operating Frequency (f) (GHz), Target Range (R) (km), Measured Received Echo Power (P_r) (dBm) in the displayed units, then use the calculated values as the first engineering target for this radar engineering design or analysis.
Design Notes
This radar engineering calculation is based on σ = P_r · (4π)³ · R⁴ / (P_t · G_t · G_r · λ²) | σ(dBsm) = 10 log₁₀(σ). Real-world accuracy depends on factors such as material properties, losses, mounting, nearby conductors, ground interaction, feed-line effects, and construction tolerance. Confirm the final system with measurement or simulation.
Build and Tuning Notes
Apply the radar cross section result as an initial target, then validate it in the intended installation. Keep the physical layout and feed arrangement consistent while testing, change one parameter at a time, and record the measured outcome before making another adjustment.
Frequently Asked Questions
What does the Radar Cross Section calculate?
Calculate target radar cross section (RCS in m² and dBsm) from transmit power, receiver power, range, frequency, and antenna gain using the monostatic radar equation. The calculation provides an initial design value based on Peak Transmit Power (P_t) (W), Transmit Antenna Gain (G_t) (dBi), Receive Antenna Gain (G_r) [Equal to G_t for Monostatic] (dBi), Operating Frequency (f) (GHz), Target Range (R) (km), Measured Received Echo Power (P_r) (dBm).
Which inputs are needed for the Radar Cross Section?
Enter Peak Transmit Power (P_t) (W), Transmit Antenna Gain (G_t) (dBi), Receive Antenna Gain (G_r) [Equal to G_t for Monostatic] (dBi), Operating Frequency (f) (GHz), Target Range (R) (km), Measured Received Echo Power (P_r) (dBm) using the displayed units. Each value directly affects the calculated result, so confirm the unit and operating conditions before running the calculation.
How accurate is this radar cross section?
It follows σ = P_r · (4π)³ · R⁴ / (P_t · G_t · G_r · λ²) | σ(dBsm) = 10 log₁₀(σ). It is accurate for the formula assumptions, but installed performance can change because of materials, loss, environment, mounting, nearby objects, and measurement uncertainty.
What should I do after using the Radar Cross Section?
Compare the result with the practical constraints of your radar engineering system, then validate the completed design with appropriate measurement equipment or simulation.
Alex Warren
B.Sc. in Electrical & Electronic Engineering (EEE)
Alex specialises in antenna design and wave propagation. His expertise helps ensure these calculators present practical RF concepts, useful design estimates, and clear engineering guidance for students, HAM operators, and wireless professionals.