OCEANIT LABORATORIES INC — Department of Defense STTR Phase I: AF18C-T003

Description

Modern electronic warfare (EW) employs agile, dynamic, convert waveforms. It has become challenging for legacy electronic intelligence (ELINT) receivers to intercept such waveforms. To cover a wide frequency band, many frequencies must be scanned rapidly. Therefore, the probability of intercepting by the super heterodyne receiver is limited by the intermediate frequency (IF) bandwidth and tuning speed. The Ultra Wideband Receiver (UWR) enables the reception of a wide spectrum without the need of frequency scanning. Persistently monitoring wide spectrums allows rapid detection of multiple signals across different bands. The most brute-force approach to achieve such receiver is to use a high-speed analog-to-digital converter (ADC) with a broadband antenna and frontend. Even with the state-of-the-art ADC, it is not possible to cover the entire band of interest while satisfying Nyquist rate. Oceanit shall develop an UWR based on sample clock modulation, consisting of two subsystems: a non-uniform sampling module, using clock modulation to extract non-uniform samples from a time domain signal; and a frequency identification system based on compressive sensing (CS) and random sample consensus (RANSAC)module, identifying carrier frequency. By first creating (via RANSAC) and exploiting (via CS) sparsity in the frequency domain, we make accurate predictions despite relative lack of data.