By David Adamy
Serving as a continuation of the bestselling ebook EW a hundred and one: a primary direction in digital struggle, this new quantity is a moment e-book according to the preferred tutorials featured within the magazine of digital security. with no delving into complicated arithmetic, this ebook permits you to comprehend very important ideas principal to EW, so that you achieve a easy operating wisdom of the applied sciences and methods deployed in todayÂ’s EW structures.
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Additional resources for EW 102 A Second Course in Electronic Warfare
A form of the radar power equation frequently used in electronic warfare applications is derived by converting the first of the earlier equations into decibel form with the received power expressed in dBm, range in kilometers, and frequency in megahertz. The wavelength term is converted to frequency by replacing λ with c /f (the speed of light divided by frequency). 43 dB. The radar power equation then becomes: PR = –103 + PT + 2G –20 log10 ( F ) –40 log10 (D ) + 10 log10( σ ) where PR = received power in dBm; PT = transmitter output power in dBm; G = antenna gain in decibels; F = transmit frequency in megahertz; D = radar to target distance in kilometers; σ = radar cross section in square meters.
A 0 dBi gain means the side lobes are lower gain than the main beam by an amount equal to the main-beam gain. An ELINT receiver typically has a narrow-band receiver, so its sensitivity is calculated from kTB, noise figure, and required signal-to-noise ratio. Like the RWR, the ELINT receiver must accept a wide range of radar types, so its video bandwidth needs to be about 10 MHz. Note that most ELINT systems use superhet receivers which have wide front-end bandwidth; however, the bandwidth of each stage of a superhet receiver is typically narrower than the preceding stage.
14, the receiver does not see distinct main-beam patterns, but rather a sinusoidal variation of received power. The high point of the sine wave occurs when the antenna beam passes closest to the target—causing the antenna to rotate in that direction to center the target in the scan. 12 In a sector scan, the antenna moves back and forth across an angular segment. This causes two time intervals between the main beams. A is from the receiver to the right edge of the scan segment and back. B is from the receiver to the left edge and back.