The multibeam cyclotron-resonance maser ~CRM! array is a new concept for compact, high-power CRM devices operating at low voltages. The CRM array studied in this paper employs low-energy electron beams, which are propagating in coupled channels in a two-dimensional periodic waveguide. A static magnetic field spirals the electrons in synchronism with a spatial harmonic of the electromagnetic wav...

Measurement of accurate positions, pulse periods and period derivatives is an essential follow-up to any pulsar survey. The procedures being used to obtain timing parameters for the pulsars discovered in the Parkes multibeam pulsar survey are described. Completed solutions have been obtained so far for about 80 pulsars. They show that the survey is preferentially finding pulsars with higher tha...

The traditional pattern synthesis method of space-borne array is to achieve a “iso-flux” beam coverage via approximating a desired pattern; however, the synthesized pattern may not optimize the whole satellite communication (SatCom) system performance. This paper analyzes the interference in multibeam SatCom system using CDMA, and establishes the relation model between user capacity and multibe...

This paper deals with multi-user detection techniques in asynchronous multibeam satellite communications. The proposed solutions are based on successive interference cancellation architecture (SIC) and channel decoding algorithms. The aim of these detection methods is to reduce the effect of cochannel interference due to co-frequency access, and consequently, improves the capacity of the mulitb...

Multibeam sonar (MBS) systems are recognised as one of the most effective tools available to map and characterise the seafloor as they can provide co-located high-resolution bathymetry and acoustic backscatter characteristics from a wide swath across a vessel’s track. While the production of bathymetry maps from MBS is well developed, processing and analysis of MBS backscatter data has not yet ...

12 Wide swath synthetic aperture radar (SAR), exemplified by the multibeam ScanSAR modes of Radarsat, can potentially deliver global near–real-time coastal wind fields with nearly 2 orders of magnitude greater spatial resolution ( 300 m) than conventional (active or passive) scatterometers ( 25 km). But this superior resolution comes with caveats. An understanding of the small-scale ocean scatt...

We critically analyze the problem of formulating duality between fringe visibility and which-way information, in multibeam interference experiments. We show that the traditional notion of visibility is incompatible with any intuitive idea of complementarity, but for the two-beam case. We derive a number of new inequalities, not present in the twobeam case, one of them coinciding with a recently...

In this paper multiwavelength observations of an impulsive flare of May 9, 1991 are presented. This event was observed with the 48 GHz multibeam focal array used at the Itapetinga radio telescope, the microwave patrol telescopes at Bern and the BATSE high time resolution hard X-ray spectrometer on board CGRO.While spatially unresolved low sensitivity observations show twomajor impulsive peaks, ...

This paper investigates the joint beamforming design problem to achieve max-min rate fairness in a satellite-terrestrial integrated network (STIN) where satellite provides wide coverage multibeam multicast users (SUs), and terrestrial base station (BS) serves multiple cellular (CUs) densely populated area. Both BS operate same frequency band. Since rate-splitting access (RSMA) has recently emer...