http://www.filss.com/subsyst/ifm_dfd.shtml
Sage Laboratories produces a wide range of instantaneous frequency measurement products tailored to the requirements of state of the art EW receivers. High speed frequency measurement is achieved either by discrimination or channelization or a combination of the two techniques. Sage's proprietary Suspended Substrate Stripline (SSS) technology is used together with custom Application Specific Integrated Circuit (ASIC) processing circuits to ensure high reproducibility, small size and low cost.
The use of high speed microwave frequency measurement products in EW equipment is becoming increasingly important as the complexity of the signal environment continues to increase. Sage's Digital Frequency Discriminators (DFD) are available in a wide range of designs offering coverage of either specific frequency bands or full 2-18 GHz coverage in a single unit. Units with frequency resolution of up to 14 bits have been produced.
DFDs find applications in both low cost RWRs (to enhance the identification of threat signals against dense non threat background signals) and sophisticated ESM and ECM receivers, where high probability of intercept and high resolution are required to enable pulse by pulse signal de-interleaving...
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