By Richard Smith
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Extra info for Arado Ar 234 A (Military Aircraft in Detail)
H ^ Earth's surface (__ ^ indirect ray " radar horizon ·" grazing ray Fig. 20 Scattering from the Earth. 5 Mm [15, p. 2-47], is equal to 4/3 the actual radius and h is the height of the radar. Part of the RF power that strikes the Earth is reflected away from the radar and the remaining power is scattered in all directions, including the direction back to the radar. The part reflected back to the radar is clutter that competes with any target returns. An example of a cluttered display, shown in Fig.
51 Velocity gate. AMPLI DISCRIMINATOR 56 RADAR ELECTRONIC WARFARE unambiguous determination of target velocity. The transmit and target spec trum then appear as shown in Fig. 49, and the velocity gate is centered on one of the many target spectral lines. Normally, all of the transmit and receive spectral lines but the central one are suppressed. In either the CW or PD case, the output of the narrow-band receiver is then detected and angletracking circuitry similar to the circuitry of a pulsed radar performs angle tracking.
The loss factor accounting for rain approximates the attenuation experienced by the radar signal as it propagates to and from the target. As would be expected, this loss increases with increased rainfall rate. However, the loss increases even more rapidly as the radar frequency increases. 10 tabulates rain attenuation rates for selected frequencies and rainfall rates . 10 by twice the range to the target. Since the target range is unknown, it must be estimated and an iteration procedure must be followed to solve for the actual range value.
Arado Ar 234 A (Military Aircraft in Detail) by Richard Smith