For the first time ever, a pair of 34-m antennas was employed to simultaneously transmit and combine 7.15-GHz (X-band) carriers to a spacecraft in deep space, yielding up to four times greater signal power than either antenna separately. Antenna arrays have the potential to synthesize the equivalent of a very large antenna aperture in a robust and cost-effective manner, by appropriately combini...

We investigate the implications for the Planck Surveyor of the recent sub-millimetre number counts obtained using the SCUBA camera. Since it observes at the same frequency as one of the higher frequency science channels on Planck, SCUBA can provide constraints on the point-source contribution to the CMB angular power spectrum, which require no extrapolation in frequency. We have calculated the ...

[1] The nature and origin of the Medusae Fossae Formation (MFF) on Mars has been debated since the return of the first Viking images. The MFF’s young age, distinctive surface texture, and lack of obvious source have prompted multiple hypotheses for its origin. This study uses data from the Mars Global Surveyor (MGS) mission to examine the MFF at all available scales. We discuss and quantify obs...

– The Low Frequency Instrument (LFI) of the " Planck Surveyor " ESA mission will perform high-resolution imaging of the Cosmic Microwave Background anisotropies at four frequencies in the 30–100 GHz range. We review the LFI main scientific objectives, the current status of the instrument design and the ongoing effort to develop software simulations of the LFI observations. In particular we disc...

In this paper, some new ideas about the dynamic situation of accelerator, dynamic pattern recognition, are briefly introduced. Some important statistical parameters about the situation description, stability evaluation and dynamic analysis of accelerator are presented from the point of a surveyor. A very useful method or procedure used to the motion analysis of the ground and the support system...