These are the tried & true radar equations used for decades and can be found in
many textbooks and desk references. Transmitter power, target distance and radar crosssection
(RCS) are used along with freespace loss (Friis equation), and antenna gains to calculate
the power that arrives at the input of the receiver. These equations cover both monostatic
radar where the transmitter and receiver are in the same location and bistatic radar
where the transmitter and receiver are in different locations
(see drawings).
Here is information on propagation time,
path loss, and Doppler.
Keep all units consistent. Losses due to atmospheric absorption and antenna polarization
are not included.
Monostatic Radar Equation (Tx and Rx in same location)
(wavelength)
(frequency)
(convert to dBW)
Bistatic Radar Equation (Tx and Rx in different locations)
(wavelength)
(frequency)
(convert to dBW)
Related Pages on RF Cafe  Radar Equation, 2Way
(another) 
Radar Equation, 1Way 
Radar Equation, Bistatic
 Radar Techniques  Primer (1945
QST)  Radar Postage Stamps 
RF Cafe Quiz #7  Radar Principles 
AN/MPN14 USAF Radar Shop 
AN/TPN19 USAF Radar Shop 
EW/Radar Handbook  Doppler Shift 
Doppler Shift Calculator 
Identification Friend or Foe
(IFF)  Radar Horizon / Line
of Sight  Radar Systems Vendors 
NEETS Radar Principles 
Radar System Vendors  Radar Design Resources
 Who Invented Radar? 
Simple Modification Increases ATC Reliability
