effective radiated power


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effective radiated power

[ə¦fek·tiv ‚rād·ē‚ād·əd ′pau̇·ər]
(electromagnetism)
The product of antenna input power and antenna power gain, expressed in kilowatts. Abbreviated ERP.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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In both equations, the ERP is the effective radiated power toward the receiver.
The RECM system employs a single, phased array for transmitting and receiving, with a high antenna gain and effective radiated power, said Filippo Neri, product-planning director for Elettronica.
"The RCS -- radar cross-section-of the Osprey requires that we have more effective radiated power," said Larry Peterson, ITT's senior product manager for EW systems.
Depending upon the method of operation, a jammer's effective radiated power (ERP) may vary from a few watts to tens of thousands of watts.
Effective radiated power, Indicated in watts unless otherwise specified.
Since decoys, jammers or ESM systems are not included in the problem, and since both the ship and the chaff cloud are passive radar reflectors, it is not necessary to specify the radar's effective radiated power, antenna gain or operating frequency.
Assuming that the transmitter and receiver locations and the transmission effective radiated power (ERP) are known, it is possible to calculate the signal power reaching the receiver.
This jamming technique focuses the jamming power over a fraction of the chirp range that will allow the J/S ratio in the jammed portion to cause a high rate of bit errors in the digital modulation which is carrying the signal's information, The fraction of the range which is jammed depends, of course, on the jammer power, the effective radiated power of the chirped transmitter and the relative ranges of the transmitter and the jammer to the jammed receiver.
(If the antenna gain is less than unity, or 0 dB, the signal strength leaving the antenna is less than the transmitter output power.) The signal power leaving the antenna is called the effective radiated power (ERP) and is commonly stated in dBm.

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