Communications: directive radio wave systems and devices (e.g. – Determining direction
Patent
1994-10-26
1996-03-05
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Determining direction
342 13, 342192, 342196, 342417, 342445, 324 7619, 324 7621, 324 7623, 324 7635, G01S 1306, G01R 2300
Patent
active
054971616
ABSTRACT:
A solution to the AOA problem is provided, receiving the data via a plurality of antennas, which uses a switching network to couple the antennas to a single receiver and a single analog-to-digital converter to digitize the incoming signal. It is possible to solve the problem where there might be multiple signals present. In the receiver, the incident radiation is mixed with a local oscillator signal and down converted to an intermediate frequency (IF). This IF signal is discretely sampled in the analog-to-digital converter, and further processing is done using digital techniques. The incoming signal has to be phase compared to obtain the angle of arrival. Different delay times are used to receive the digital data from the different antennas at the same sampling times, with the data aligned according to the time axis. The frequency of the incoming signals can then be detected by performing a Fast Fourier Transform (FFT) on the data from one antenna with respect to time. Once the primary frequencies are determined, one can find the related amplitudes of the data from the other antennas. An FFT can then be performed on the amplitude values found. The output of this FFT gives the phase information related to the incoming signals and thus the solution to the AOA problem.
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Franz Bernard E.
Kundert Thomas L.
Sotomayor John B.
The United States of America as represented by the Secretary of
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