Browsing by Author "Sulzer, M.P."
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Item Open Access Binary pulse compression techniques for MST radars(ICSU, International Council of Scientific Unions, 1984) Woodman Pollitt, Ronald Francisco; Sulzer, M.P.; Farley, D.T.In this paper we discuss many aspects of codes and decoding and their applications to MST experimenta. This includes Barker codes and longer individual codes, and then complementary codes and other code sets. We discuss software decoding and also hardware decoders and coherent integrators.Item Open Access Decoding: codes and hardware implementation(ICSU, International Council of Scientific Unions, 1983) Sulzer, M.P.; Woodman Pollitt, Ronald FranciscoMST radar vary considerably from one installation to the next in the type of hardware, operating schedule, associated personnel, and amount of funding. Most such systems do not have the computing power to decode in software when the decoding must be performed for each received pulse, as is required for certain sets of phase codes. These sets allow one to obtain the best signal-to-sidelobe ratio when operating at the minimum baud length allowed by the bandwidth of the transmitter. We discuss here a number of realizations of the hardware phase decoder, and discuss the applicability of each to decoding MST radar signals. We present a new design for a decoder which is very inexpensive to build, easy to add to an existing system and is capable of decoding on each received pulse using codes with a baud length as short as one microsecond.Item Open Access Incoherent scatter measurements of aurora-like ion beam distribution and ionospheric holes produced by the space shuttle flying over the radars at Jicamarca, Kwajalein, and Arecibo(Instituto Geofísico del Perú, 2000) Bernhardt, P.A.; Sulzer, M.P.; Kudeki, E.; Woodman Pollitt, Ronald Francisco; Tsonuda, R.In October 1997 and July 1999 during the STS-86 and STS-93 flights of the Space Shuttle, the crew performed experiments with controlled ion injections over the incoherent scatter radar (ISR) facilities located at Arecibo, Puerto Rico; Jicamarca, Perú; and Kwajalein, Marshall Islands. Ion beams were formed by charge exchange in the ionosphere of the high velocity neutral molecules exhausted by the Orbital Maneuver Subsystem (OMS) engines on the Space Shuttle. Pick-up ions were produced with energies between 2 and 10 eV depending on the orientation of the OMS engines relative to the vehicle orbit. The ions eventually recombined with electrons yielding electrón density depressions or holes.