Multi-station HF FMCW radar frequency sharing with GPS time...

Communications: directive radio wave systems and devices (e.g. – Plural radar

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C342S082000, C342S128000, C342S175000, C342S195000

Reexamination Certificate

active

06856276

ABSTRACT:
Systems and methods are described for HF radar frequency sharing with GPS time modulation multiplexing. A method is provided that includes generating clock signals from the time information contained in a GPS signal. Radio frequency signals are transmitted and received in a sequence whose start times are dictated by the clock signals. The clock signals also control the modulation of the radio frequency signals. The radio frequency signals are modulated by using a sweep modulation. An apparatus to implement the method includes a GPS receiver, a state machine, a clock generator, a microprocessor, a memory chip, a signal synthesizer, and a digital data output device. The GPS receiver extracts time information from GPS signals. The state machine controls radar functions versus time. The microprocessor performs modulation multiplexing on radar signals.

REFERENCES:
patent: 3882506 (1975-05-01), Mori et al.
patent: 4172225 (1979-10-01), Woldseth et al.
patent: 4281409 (1981-07-01), Schneider
patent: 4433336 (1984-02-01), Carr
patent: 4613862 (1986-09-01), O'Donnell
patent: 4996533 (1991-02-01), May et al.
patent: 5023618 (1991-06-01), Reits
patent: 5252980 (1993-10-01), Gray et al.
patent: 5361072 (1994-11-01), Barrick et al.
patent: 5534868 (1996-07-01), Gjessing et al.
patent: 5990834 (1999-11-01), Barrick et al.
patent: 6137433 (2000-10-01), Zavorotny et al.
patent: 6232922 (2001-05-01), McIntosh
patent: 6307868 (2001-10-01), Rakib et al.
patent: 6462699 (2002-10-01), Wurman et al.
patent: 1017190 (2000-07-01), None
patent: 1099957 (2001-05-01), None
patent: 2347319 (2000-08-01), None
patent: 8-204600 (1996-08-01), None
patent: 10-170628 (1998-06-01), None
patent: 11-264864 (1999-09-01), None
patent: WO 9626591 (1996-08-01), None
Barrick and Evans, “Impementation of coastal current-mapping HF radar system,”Progress Report No. 1, NOAA Tech Report ERL 373-WPL 47, 1976.
Barrick and Lipa, “Evolution of bearing determination in HF current mapping radars,”Oceanography, 10(2):72-75, 1997.
Barrick, “Comment on Single station ocean current vector measurement: Application of the spaced antenna (SA) technique,”Geophys. Res. Letters, 17:1637-1639, 1990.
Barrick, “FM/CW radar signals and digital processing,”NOAA Tech. Report ERL 283-WPL 26, 1973.
Barrick, et al., “Ocean surface currents mapped by radar,”Science, 198:138-144, 1977.
Bjorkstadt and Roughgarden, “Larval transport and coastal upwelling: an application of HF radar in ecological research,”Oceanography, 10(2):64-67, 1997.
Ereemev, et al., “Reconstruction of oceanic flow characteristics from quasi-Lagrangian data. 2. characteristics of the large-scale circulation in the black sea,”J. Geophys. Res., 97(C6):9743-9753, 1992.
Frisch and Leise, “A note on using continuity to extend HF radar surface current measurements,”J. Geophys. Res., 86:11089-11090, 1981.
Lipa and Barrick, “Extraction of sea state from HF radar sea echo: Mathematical theory and modeling,”Radio Sci., 21:81-100, 1986.
Lipa and Barrick, “Least-squares methods for the extraction of surface currents from CODAR crossed-loop data: Application at ARSLOE,”IEEE J. Oceanic Engr., OE-8:226-253, 1983.
Lipphardt et al., “Blending HF radar and model velocities in Monterey Bay through normal mode analysis,”J. Geophys. Res., 105(C2):3425-3450, 2000.
Zel'dovich et al., “On the representation of three-dimensional vector fields with scalar potentials (in Russian),”Dokl. Akad. Nauk. SSSR, 284(1):103-106, 1985.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Multi-station HF FMCW radar frequency sharing with GPS time... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Multi-station HF FMCW radar frequency sharing with GPS time..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multi-station HF FMCW radar frequency sharing with GPS time... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3471656

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.