First, let us define two terms: a victim and an aggressor. A victim is a radar device whose receiver is affected by interferers. An aggressor is a radar device whose transmit affects the victim's receiver.

The received signal strength in dBm (P_Interference) of an interfering radar can be computed using Equation 1.

Equation 1.

where

• P_tx is the aggressor radar’s transmit power (in dBm)
• txAntGain is the aggressor radar’s transmit antenna gain (in dB)
• rxAntGain is the victim radar’s receive antenna gain (in dB).

The distance between the aggressor and the victim is R, and the average RF wavelength is λ.

The radar equation for targets is shown in Equation 2.

Equation 2.

Comparing the two equations shows that the path loss effect (that is, the effect of R) is weaker for interferers than targets. In other words, interference is likely to dominate the received signal even if it is far away.