Method and Device for Detection of Motion of the Surface of an Object
First Claim
1. A method for detection of motion of the surface (13) of an object (4) by means of a detection device (1), the object (4) being stationary during a detection process, and situated in a space (2) on the opposite side of a wall (3) in relation to the detection device (1), and having a relative dielectric constant ∈
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r greater than 1.1, the method is characterized by the steps of;
a) generating a data model of the object (4) and the above-mentioned space (2), which data model is stored in a central processing unit (10) comprised in the detection device (1),b) transmitting radar signals in the form of radar pulses, the frequency components of which are distributed within the frequency range of 30 MHz-12.4 GHz,c) receiving reflected radar signals generated at reflection points consisting of dielectric steps when the radar signals pass into and out of, respectively, the object (4),d) comparing the received reflected radar signals with the transmitted radar signals in order to obtain correlation results, each of which communicates distances between two known positions (11a-c, 12) via said reflection points,e) difference analyzing different correlation results obtained over time in order to detect a motion of a specific reflection point of the surface (13),f) by means of difference analyses of correlation results belonging to at least three mutually separated sets of two known positions (11a-c, 12) unambiguously determining the location of the specific moved reflection point,g) creating a radar model of the motion of the surface (13) of the object (4), and visualising the radar model in the above-mentioned data model.
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Abstract
The invention relates to a method for detection of motion of the surface of an object by means of a detection device, the object being stationary during a detection process, and situated in a space on the opposite side of a wall in relation to the detection device, and having a relative dielectric constant ∈r greater than 1.1. The method comprises steps of transmitting radar signals and receiving radar signals reflected by the object, and if a motion has been detected, in addition visualising the motion in a three-dimensional combined radar model and data model. The invention also relates to a detection device for carrying out the method.
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Citations
8 Claims
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1. A method for detection of motion of the surface (13) of an object (4) by means of a detection device (1), the object (4) being stationary during a detection process, and situated in a space (2) on the opposite side of a wall (3) in relation to the detection device (1), and having a relative dielectric constant ∈
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r greater than 1.1, the method is characterized by the steps of;
a) generating a data model of the object (4) and the above-mentioned space (2), which data model is stored in a central processing unit (10) comprised in the detection device (1), b) transmitting radar signals in the form of radar pulses, the frequency components of which are distributed within the frequency range of 30 MHz-12.4 GHz, c) receiving reflected radar signals generated at reflection points consisting of dielectric steps when the radar signals pass into and out of, respectively, the object (4), d) comparing the received reflected radar signals with the transmitted radar signals in order to obtain correlation results, each of which communicates distances between two known positions (11a-c, 12) via said reflection points, e) difference analyzing different correlation results obtained over time in order to detect a motion of a specific reflection point of the surface (13), f) by means of difference analyses of correlation results belonging to at least three mutually separated sets of two known positions (11a-c, 12) unambiguously determining the location of the specific moved reflection point, g) creating a radar model of the motion of the surface (13) of the object (4), and visualising the radar model in the above-mentioned data model. - View Dependent Claims (2, 3, 4, 5)
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r greater than 1.1, the method is characterized by the steps of;
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6. A detection device (1) for detection of motion of the surface (13) of an object (4), which is stationary during a detection process, and which is situated in a space (2) on the opposite side of a wall (3) in relation to said detection device (1), and which has a relative dielectric constant ∈
- r greater than 1.1, characterized in that the same comprises a central processing unit (10) in which a data model of the object and the above-mentioned space (2) is stored, means (11a-c) to transmit radar signals in the form of pulses, the frequency components of which are distributed within the frequency range of 30 MHz-12.4 GHz, means (12) to receive reflected radar signals generated at reflection points consisting of dielectric steps when the radar signals pass into and out of, respectively, the object (4), means to compare the reflected radar signals with the transmitted radar signals in order to obtain correlation results, each of which communicates a distance between two known positions (11a-c, 12) via said reflection points, means to difference analyze different correlation results obtained over time in order to detect a motion of at least one specific reflection point of the surface (13), means to unambiguously determine the location of the specific moved reflection point based on difference analyses of correlation results belonging to at least three mutually separated sets of two known positions (11a-c, 12), means to create a radar model of a detected motion of the surface (13) of the object (4), and means to visualise the radar model in the above-mentioned data model.
- View Dependent Claims (7, 8)
Specification