Communications: directive radio wave systems and devices (e.g. – Determining distance – With pulse modulation
Reexamination Certificate
2006-12-19
2006-12-19
Lobo, Ian J. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Determining distance
With pulse modulation
C342S134000, C342S135000, C342S196000
Reexamination Certificate
active
07151481
ABSTRACT:
A method for detecting targets and determining their distance by means of an HPRF radar system including a transmitter for transmitting bursts having a preselectable number Z of transmission pulses and a preselectable pulse repetition frequency PRF and a receiver for receiving the echo signals. Successive bursts are transmitted with a preselectable time lag, where the time lag corresponds to a preselectable number E of transmission pulses. A data record of Z+E detected signals is generated, where each detected signal consists of superimposed echo signals from different unique distance ranges, each distance range having a number A of distance lines, each line having Z+E distance cells. A target is detected by calculating a Z+E-point fast Fourier transform for each distance line, and determining when the signal amplitude is greater than a preselectable threshold value. The distance to a target is determined by calculating spectra of Z-point fast Fourier transforms for the distance lines by shifting a Z-point FFT window incrementally over the Z+E distance cells of a distance line.
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Al-Youssof Nergess
Mahr Thomas
Strecker Andreas
Wieszt Andreas
EADS Deutschland GmbH
Lobo Ian J.
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