Decibels and Radars |
dBm measures power relative to 1 milliwatt, while dBW measures power relative to 1 watt.
So to convert between the two, you have these equations:
dBm = dBW + 30
or
dBW = dBm - 30
dBW = 10 x log_{10}(Power_{Watts})
dBW: Transmitter power output in
decibels.
Power_{Watts}:
Transmitter power output in watts.
EXAMPLE: What is the dBW of a 1 megawatt radar? 10 x log_{10}(1,000,000) = 60 dB |
Power_{Watts} = 10^{(Decibels/10)}
Power_{Watts}:
Transmitter power output in watts.
Decibels: Transmitter power
output in decibels.
EXAMPLE: What is the power in watts of a 100 dBw radar? 10^{(100/10)} = 10,000,000,000 watts. |
dBsm = 10 x log_{10}(RCS/1m^{2})
dBsm: Radar Cross Section of target in
decibels.
RCS: Radar Cross Section of target in square meters.
EXAMPLE: What is the dBsm of a stealth fighter with a RCS of 0.01 m^{2}? 10 x log_{10}(0.01/1m^{2}) = -20 dBsm |
RCS = 10^{(Decibels/10)}
RCS: Radar Cross Section of target in
square meters.
Decibels: Radar Cross Section of target in
decibels.
EXAMPLE: What is the RCS in square meters of an aircraft with a RCS of 5 dB? 10^{(5/10)} = 3.16 m2 |
dBi = 10 x log_{10}(Gain/1)