Digital beam forming using frequency-modulated signals
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United States of America Patent
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Jun 14, 2011
Grant Date -
Sep 3, 2009
app pub date -
Feb 16, 2009
filing date -
Feb 29, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a method for angular determination and/or for increasing the angular resolution or a detectable angular range when operating antenna groups using the technique of digital beam forming (DBF), as well as a device for carrying out the method. In the method, a measurement signal with a carrier signal and a frequency-modulated signal component are received via at least one antenna group directly or after reflection on one or several objects. The angle, at which the measurement signal is received, is determined by evaluating a phase difference in the received measurement signal which occurs between adjacent antenna elements of the antenna group. The method is characterized in that for determining the phase difference the frequency-modulated signal component is also evaluated, exclusively or additionally to an evaluation of the carrier signal. As a result of the method and the device, the angular resolution and/or the angular range which is detected in an unambiguous manner may be increased in a cost-effective manner with digital beam forming.
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