DDS spur mitigation in a high performance radar exciter

Year	Description
2000	Invention patented by Howard S. Nussbaum and William P. Posey on August 27th, 2000. Abstract: A technique is described for providing a pulsed radar exciter signal, in a radar exciter including a direct digital synthesizer (DDS). The DDS is reset pulse-to-pulse to provide a pulsed DDS signal having pulse-to-pulse phase discontinuities due to the resetting of the DDS. The phase of the pulsed DDS signal can be shifted pulse-to-pulse by a phase shift that is held constant over a pulse to correct the pulse-to-pulse phasing of the DDS signal. A discrete phase modulator can provide the phase shift. The phase of the pulsed DDS signal can be shifted pulse-to-pulse by an additional phase shift which is a linear phase sequence from pulse-to-pulse, or by an additional phase shift which is a quadratic phase sequence from pulse-to-pulse to produce a ranging waveform.
Source: selected by the editor from original sources.

Invention: DDS spur mitigation in a high performance radar exciter