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One of the key elements of modern electronic warfare (EW) systems is the Digital Radio Frequency Memory (DRFM). It is indispensable in electronic countermeasures against radars threatening platforms, such as combat aircraft or ships.
The way of operation is to receive the RF pulses of the hostile radar, delaying them for a certain time and reradiating the RF pulse signals. In this process, deceptive range information can be generated to make tracking for the threat radar more difficult.
In order to improve the jamming effectiveness, the stored RF pulse signal can be modulated and manipulated with jamming signals, prior to retransmission. These additional modulations are generated by a techniques generator which can modulate the stored RF pulse signal in the time, frequency and amplitude domains.
Modern threat radars (e.g. pulse-Doppler radars) have a fixed phase relationship between the transmitted and received RF signals because they operate on a basis of coherent processing. To generate effective pulse-Doppler...