Near-field antenna array with signal processing
First Claim
1. An electromagnetic antenna assembly for detecting moving insects in a region comprising:
- an array of receiving elements that receive signals transmitted into a field of the array in the region at least at one frequency;
mixer means that combines the received signals with a reference signal to extract in-phase (I) and quadrature (Q) IF signals from the received signals, wherein the I and Q signals are combined to form complex signal vectors;
adjusting means that adjust phase and magnitude values of each of said complex signal vectors in real time to create a beamfront that is deliberately distorted such that the beamfront has a plurality of maxima and minima values;
summing means that sum the adjusted complex signal vectors; and
processing means that spatially and temporally filter said summed complex signal vectors to detect changes in the field over time corresponding to at least one path of said insects moving in said region.
1 Assignment
0 Petitions
Accused Products
Abstract
Method and apparatus for extracting coherent information from in-phase (I) and quadrature (Q) signals. In a form, signals from an antenna array are mixed to form a plurality of I and Q signals that combined to form respective complex vectors. Each vector is adjusted in phase and magnitude to compensate for variations in field signal patterns, summed with other vectors, spatially and temporally filtered, and processed using spectral analysis algorithms to extract coherent spatial information. The coherent spatial information may be used to detect the presence, number and activity of insects within a structure in the near field of the antenna.
-
Citations
21 Claims
-
1. An electromagnetic antenna assembly for detecting moving insects in a region comprising:
-
an array of receiving elements that receive signals transmitted into a field of the array in the region at least at one frequency; mixer means that combines the received signals with a reference signal to extract in-phase (I) and quadrature (Q) IF signals from the received signals, wherein the I and Q signals are combined to form complex signal vectors; adjusting means that adjust phase and magnitude values of each of said complex signal vectors in real time to create a beamfront that is deliberately distorted such that the beamfront has a plurality of maxima and minima values; summing means that sum the adjusted complex signal vectors; and processing means that spatially and temporally filter said summed complex signal vectors to detect changes in the field over time corresponding to at least one path of said insects moving in said region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A method of extracting coherent spatial information from signals received by the elements of a microwave antenna array for detecting moving insects in a region including the steps of:
-
mixing signals from the antenna array with a local oscillator signal to extract in-phase (I) and quadrature (Q) IF signals; combining the I and Q signals to form complex signal vectors; adjusting phase and magnitude values of the complex signal vectors in real time to create a beamfront that is deliberately distorted such that the beamfront has a plurality of maxima and minima values; summing the adjusted complex signal vectors to form total signal vectors; and processing the total signal vectors using spectral analysis algorithms to extract said coherent spatial information to detect changes in the field over time corresponding to at least one path of said insects moving in said region. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. A signal processor for extracting near or far field signals from an electromagnetic antenna array for detecting moving insects in a region comprising:
-
mixer means adapted to extract in-phase (I) and quadrature (Q) signals from signals received by receiving elements of the antenna array in the region; converter means adapted to combine the I and Q signals to form complex signal vectors, adjust the phase and amplitude of the complex signal vectors in real time to create a beamfront that is deliberately distorted such that the beamfront has a plurality of maxima and minima values, and add the complex signal vectors to form total vectors; and processor means adapted to process the total vectors to extract coherent spatial information to detect changes in the field over time corresponding to at least one path of said insects moving in said region.
-
Specification