Communications: directive radio wave systems and devices (e.g. – Determining distance – Phase comparison
Reexamination Certificate
2007-04-17
2007-04-17
Tarcza, Thomas H. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Determining distance
Phase comparison
C342S125000, C342S118000, C342S194000, C342S129000
Reexamination Certificate
active
10940657
ABSTRACT:
A method for determining the distance between a base station (SLG) and a mobile object (DT1–DT3). A HF carrier frequency and an offset frequency (df) are predetermined for a QAM modulation. The HF carrier frequency is increased and decreased by the offset frequency in sequence over time in such a way that the HF carrier base frequencies (fo+df, fo−df) resulting in an HF carrier signal (TS) thus modulated exhibit an identical phase when the frequency is changed. The HF carrier signal is subsequently transmitted and simultaneously mixed (MIX) with an HF carrier signal (RS) that has been backscattered by the mobile object to obtain a carrier phase signal (PS). The corresponding carrier phase (PH1, PH2) for the two HF carrier base frequencies is determined in sequence over time. The difference (dPH) between these phases is used to calculate the distance between the base station and the respective mobile object.
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Gila Janos
Konrad Wolfgang
Renner Alexander
Barker Matthew M
Siemens Aktiengesellschaft
Tarcza Thomas H.
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