The ability to do radio astronomy at wavelengths > 1 m is 7 frequently restricted by narrowband anthropogenic radio frequency interfer

Signal Amplification by Reversible Exchange (SABRE) is an attractive nuclear spin hyperpolarization technique capable of huge sensitivity enhancement in nuclear magnetic resonance (NMR) detection. The resonance condition of SABRE hyperpolarization depends on coherent spin mixing, which can be achieved naturally at a low magnetic field. The optimum transfer field to spin-1/2 heteronuclei is tech...

Coherent low-frequency ($\lesssim 200$ MHz) radio emission from stars encodes the conditions of outer corona, mass-ejection events, and space weather. Previous searches for emitting stellar systems have lacked sensitivity to detect general population, instead largely focusing on targeted studies anomalously active stars. Here we present 19 detections coherent associated with known M~dwarfs a bl...

We introduce a high-performance implementation of a loosely coherent statistic sensitive to signals spanning a finite-dimensional manifold in parameter space. Results from full-scale simulations on Gaussian noise are discussed, as well as implications for future searches for continuous gravitational waves and related searches for slowly modulated signals, such as emitted by radio pulsars. We de...

Coherent detection techniques are used almost exclusively in radio astronomy, while direct detection predominates in the optical and infrared bands. The millimeter, submillimeter, and far–infrared bands represent a transition region from coherent to direct detection. In this paper, the relative merits of coherent and direct detection in the mm through far–IR are compared, the techniques of cohe...

Radar systems, based on bistatic radar concept attracted a substantial attention in the recent years. Passive coherent location systems using “transmitters of opportunity” like radio or TV broadcasters, GSM base stations, satellite communication and GNSS signals proved their potential in detection and tracking moving targets over a significant area. In this paper the multistatic location system...