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What is the difference between radar “transmit power”, “power density”, and EIRP specifications?

April 26, 2017eirp radar specifications

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What is the difference between radar “transmit power”, “power density”, and EIRP specifications?

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(A)Transmit power is the power delivered to the antenna. Antenna specifications (gain and efficiency) are required to determine the radiated power from power delivered to the antenna. Power Density is a measure of radiated power per area. Typically radars are specified in milliwatts per square centimeters (mW/square centimeter) at a specific range (usually 3 meters). The greater the range the lower the power density. ERIP (Effective Radiated Isotropic Power) or just ERP (Effective Radiated Power) also measures radiated power compared to a perfect isotropic radiator in Watts (W), milliwatts (mW), or dBm (decibels above or below 1 mW).