Waveform frequency notching
| DWPI Title: System for incorporating waveform frequency notches into radar spectrum, has multiplier component for operating in conjunction with transition factor that controls where adjustment from first position to second position is to occur |
| Abstract: The various technologies presented herein relate to incorporating one or more notches into a radar spectrum, whereby the notches relate to one or more frequencies for which no radar transmission is to occur. An instantaneous frequency is monitored and if the frequency is determined to be of a restricted frequency, then a radar signal can be modified. Modification can include replacing the signal with a signal having a different instantaneous amplitude, a different instantaneous phase, etc. The modification can occur in a WFS prior to a DAC, as well as prior to a sin ROM component and/or a cos ROM component. Further, the notch can be dithered to enable formation of a deep notch. The notch can also undergo signal transitioning to enable formation of a deep notch. The restricted frequencies can be stored in a LUT against which an instantaneous frequency can be compared. |
| Use: System for incorporating waveform frequency notches into a radar spectrum. |
| Advantage: The system avoids switching speed issues by in turn avoiding any external signal switching, or disabling a digital to analog converter. The system selects a notch tapering to enable tapering to specifically compensate for subsequent analog component linearity, thus achieving a more precise transmitted spectrum. The system generates instantaneous frequency signals by a linear frequency modulated chirp generator componentry without regard for any subsequent notching operation being performed. |
| Novelty: The system (100) has a signal modifier component in communication with a control component for receiving an indicator and comprising a first input and a second input. The signal modifier component passes a signal received at the first input of the signal modifier component when the signal modifier component is in a first position. A multiplier component operates in conjunction with a transition factor that controls where adjustment from a first position to a second position occurs, where the transition factor is based on sampling frequency of a radar spectrum transmission. |
| Filed: 11/20/2014 |
| Application Number: US14548676A |
| Tech ID: SD 12743.0 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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