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Patent No. 6411104 Apparatus and method for detecting electromagnetic wave source, and method for analyzing the same

 

Patent No. 6411104

Apparatus and method for detecting electromagnetic wave source, and method for analyzing the same (Uesaka, et al., Jun 25, 2002)

Abstract

There are provided electromagnetic wave source detecting apparatus and method as well as electromagnetic wave source analyzing system and method which can detect and analyze a source of (electromagnetic disturbing wave) representing a main factor in generating an electromagnetic field remotely of the apparatus in order to suppress the electromagnetic field intensity at the remote distance from the apparatus to below a regulated value. In the present invention, a magnetic field near an object 110 to be measured is measured by a set of at least two or more probes 101 and 102, a position of an electromagnetic wave source is detected through simplified calculation of one function using a phase difference between the two probes, a current distribution on the measured object is determined by solving simultaneous equations containing the position information and magnitudes of measured magnetic fields and an electromagnetic field at a remote distance from the apparatus is determined from the current distribution, thereby identifying the source representing the main factor in generating the electromagnetic field remotely of the apparatus.

Notes:  

Apparatus and method for detecting electromagnetic wave source, and method for analyzing the same. Filed April 2000, granted June 2002. Device for detecting an electromagnetic wave, measuring its intensity and using a triangulation method for determining where said electromagnetic wave is emanating from. Larger scale for psychotronic attacks maybe. As is would be useful for detecting attacks on electronic equipment in home or office by electromagnetic weaponry.

SUMMARY OF THE INVENTION

To accomplish the above objects, an electromagnetic wave source detecting apparatus according to the invention comprises a plurality of probes for measuring intensities Hm (inclusive of phase data) of an electromagnetic field generated from an object to be measured of an electronic apparatus at each measuring position (x.sub.m, y.sub.m) which changes two-dimensionally along a measured object plane near the measured object, and calculation means for calculating a phase difference .DELTA..phi..sub.m =(.phi..sub.2 -.phi..sub.1).sub.m or time difference .DELTA.t.sub.m =(t.sub.2 -t.sub.1).sub.m between magnetic fields associated with the probes from the electromagnetic field intensities Hm measured by the individual plural probes at each measuring position (x.sub.m, y.sub.m), calculating a difference d between distances from a presumptive electromagnetic wave source on the basis of the phase difference or time difference calculated at each measuring position, determining a locus of the presumptive electromagnetic wave source on the measured object plane from the distance difference d and geometrical relations (for example, z.sub.1, z.sub.2) of the plurality of probes to the measured object and detecting an intersection of loci of the presumptive electromagnetic wave source which are determined at a plurality of measuring positions to calculate and identify a position (x.sub.s, y.sub.s).sub.n of an electromagnetic wave source existing in the measured object.

Further, an electromagnetic wave source detecting apparatus according to the invention comprises a plurality of probes for measuring intensities Hm (inclusive of phase data) of an electromagnetic field generated from an object to be measured of an electronic apparatus at each measuring position (x.sub.m, y.sub.m) which changes two-dimensionally along a measured object plane near the measured object, and calculation means for calculating a phase difference .DELTA..phi..sub.m =(.phi..sub.2 -.phi..sub.1).sub.m or time difference .DELTA.t.sub.m =(t.sub.2 -t.sub.1).sub.m between magnetic fields associated with the probes from the electromagnetic field intensities Hm measured by the individual plural probes at each measuring position (x.sub.m, y.sub.m), calculating a difference d between distances from a presumptive electromagnetic wave source on the basis of the phase difference or time difference calculated at each measuring position, determining a locus of the presumptive electromagnetic wave source on the measured object plane from the distance difference d and geometric relations (for example, z.sub.1, z.sub.2) of the plurality of probes to the measured object, detecting an intersection (x.sub.s, y.sub.s).sub.n of loci of the presumptive electromagnetic wave source which are determined at a plurality of measuring positions to calculate and identify a position of an electromagnetic wave source existing inside the measured object, and further calculating magnitude In of current in the electromagnetic wave source existing at the identified position on the basis of the electromagnetic field intensities Hm measured by the probes at each measuring position.

Further, an electromagnetic wave source detecting apparatus according to the invention comprises a plurality of probes for measuring intensities Hm of an electromagnetic field generated from an object to be measured of an electronic apparatus at each measuring position (x.sub.m, y.sub.m) which changes two-dimensionally along a measured object plane near the measured object, and calculation means for calculating a phase difference .DELTA..phi..sub.m =(.phi..sub.2 -.phi..sub.1).sub.m or time difference .DELTA.t.sub.m =(t.sub.2 -t.sub.1).sub.m between magnetic fields associated with the probes from the electromagnetic field intensities Hm measured by the individual plural probes at each measuring position, calculating a difference d between distances from a presumptive electromagnetic wave source on the basis of the phase difference or time difference calculated at each measuring position, determining a locus of the presumptive electromagnetic wave source on the measured object plane from the distance difference d and geometrical relations (for example, z.sub.1, z.sub.2) of the plurality of probes to the measured object, detecting an intersection (x.sub.s, y.sub.s).sub.n of loci of the presumptive electromagnetic wave source which are determined at a plurality of measuring positions to calculate and identify a position of an electromagnetic wave source existing inside the measured object, and further calculating magnitudes In of current distributions in a plurality of electromagnetic wave sources existing at individual plural positions identified similarly on the basis of the electromagnetic field intensities Hm measured by the probes at each measuring position.

Further, in the present invention, the plurality of probes in the electromagnetic wave source detecting apparatus are arranged on the same probe axis at the individual measuring positions.

Further, in the present invention, the plurality of probes in the electromagnetic wave source detecting apparatus are arranged on the same probe axis vertical to the measured object plane at the individual measuring positions (x.sub.m, y.sub.m). In this case, the locus of the presumptive electromagnetic wave source on the measured object plane is indicated by a radius a.sub.m.

Further, in the present invention, the calculation means of the electromagnetic wave source detecting apparatus further calculates inversely an electromagnetic field intensity En at a desired remote distance on the basis of the calculated magnitude of a current distribution in the electromagnetic wave source existing at the identified position on the measured object.

Further, in the present invention, the calculation means of the electromagnetic wave source detecting apparats inversely calculates an electromagnetic field intensity En at a desired remote distance on the basis of the calculated magnitude of a current distribution in each of the plurality of electromagnetic wave sources existing at each of the identified plural positions on the measured object.

Further, an electromagnetic wave source analyzing method according to the invention collates a position of an electromagnetic wave source existing on a measured object identified by using the aforementioned electromagnetic wave source detecting apparatus with mounting information (for example, circuit diagrams or mounting diagrams) of the measured object through, for example, display on a display unit. This permits electronic parts generating an unwanted electromagnetic wave (electromagnetic disturbing wave) to be ascertained.

Further, an electromagnetic wave source analyzing method according to the invention analyzes whether an electromagnetic field intensity at a desired remote distance calculated by using the electromagnetic wave source detecting apparatus satisfies the VCCI standards.

Further, an electromagnetic wave source detecting method according to the invention comprises measuring intensities Hm of an electromagnetic field generated from an object to be measured of an electronic apparatus at each measuring position (x.sub.m, y.sub.m) which changes two-dimensionally along a measured object plane near the measured object by using a plurality of probes, calculating a phase difference .DELTA..phi..sub.m =(.phi..sub.2 -.phi..sub.1).sub.m or time difference .DELTA.t.sub.m =(t.sub.2 -t.sub.1).sub.m between magnetic fields associated with the probes from the magnetic field intensities Hm measured at each measuring position (x.sub.m, y.sub.m), calculating a difference d between distances from a presumptive electromagnetic wave-source on the basis of the phase difference or time difference calculated at each measuring position, determining a locus of the presumptive electromagnetic wave source on the measured object plane from the distance difference d and geometrical relations (for example, z.sub.1, z.sub.2) of the plurality of probes to the measured object, and detecting an intersection (x.sub.s, y.sub.s).sub.n of loci of the presumptive electromagnetic wave source which are determined at a plurality of measuring positions to calculate and identify a position of an electromagnetic wave source existing inside the measured object.

Further, an electromagnetic wave source detecting method according to the invention comprises measuring intensities Hm of an electromagnetic field generated from an object to be measured of an electronic apparatus at each measuring position (x.sub.m, y.sub.m) which changes two-dimensionally along a measured object plane near the measured object by using a plurality of probes, calculating a phase difference .DELTA..phi..sub.m =(.phi..sub.2 -.phi..sub.1).sub.m or time difference .DELTA.t.sub.m =(t.sub.2 -t.sub.1).sub.m between magnetic fields associated with the probes from the electromagnetic field intensities Hm measured at each measuring position, calculating a difference d between distances from a presumptive electromagnetic wave source on the basis of the phase difference or time difference calculated at each measuring position, determining a locus of the presumptive electromagnetic wave source on the measured object plane from the distance difference d and geometrical relations (for example, z.sub.1, z.sub.2) of the plurality of probes to the measured object, detecting an intersection (x.sub.s, y.sub.s).sub.n of loci of the presumptive electromagnetic wave source which are determined at a plurality of measuring positions to calculate and identify an electromagnetic wave source existing inside the measured object, and further calculating magnitude In of current in the electromagnetic wave source existing at the identified position on the basis of the electromagnetic field intensities measured by the probes at each measuring position.

As described above, with the construction as above, by approaching only magnetic field probes small enough not to disturb magnetic fields from the main body of the measuring apparatus to the measured object, the positions of electromagnetic wave sources existing at arbitrary positions on the measured object can be presumed from the phase information by reducing the number M of measuring points of magnetic field distribution without being affected by the influence of reflection to obtain the number N (=M) of the sources, thereby ensuring that the positions of the electromagnetic wave sources existing at the arbitrary positions can be presumed with high accuracy and at a high rate.

Further, with the above construction, it can be analyzed and decided whether the measured object satisfies the VCCI standards.

Further, with the above construction, factors (kinds of electronic parts) of the source of unwanted electromagnetic wave (electromagnetic disturbing wave) detected on the measured object can be surveyed.

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