(under the class definition) Subject matter wherein a radar system generates the effect of a long antenna by signal processing means rather than by the actual use of a long physical antenna.
(1) Note. The long antenna is synthesized through the motion of a small antenna relative to the target with either the antenna or the target or both moving. The signal received by the antenna is processed coherently over an integration time. The synthesized antenna length is given by the trajectory traversed by the small antenna relative to the target during the coherent integration time. Because of the two-way phase shift in forming the effective radiation pattern, the effective half-power beam-width must be computed considering twice the synthesized antenna length.
