Communications: directive radio wave systems and devices (e.g. – Determining distance
Reexamination Certificate
2006-09-07
2009-02-03
Gregory, Bernarr E (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Determining distance
C342S005000, C342S006000, C342S042000, C342S043000, C342S051000, C342S124000, C342S125000, C342S134000, C342S135000, C342S159000, C342S175000, C342S188000, C342S195000, C324S600000, C324S629000, C324S637000, C324S642000, C324S644000
Reexamination Certificate
active
07486226
ABSTRACT:
The invention relates to a system, device, and method for using radar signals to measure the distance (h) to a surface from said device, the device comprising a transmitter and a transmitting antenna for transmitting radar signals, and a receiver and a receiving antenna for receiving a radar signal. The device may also comprise a first additional reflecting object separate from the receiving antenna, which additional reflector is designed so as to introduce a first predetermined alteration in radar signals upon reflection, with the device being equipped with means to differ between received signals with and without said predetermined alteration. The first predetermined alteration introduced by the first separate reflector can be, for example, a modulation shift or a shift in the polarization of the signal. In a typical embodiment the additional reflector is located close to the radar unit creating a double transition from radar unit to the surface.
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“Antenna Polarization Considerations in Wireless Communications Systems”; no author listed; Cushcraft Corporation; Manchester, New Hapshire; no date given; copyright 1999-2002.
Gregory Bernarr E
Rosemount Tank Radar AB
Westman Champlin & Kelly P.A.
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