Patent US3814464A successfully refreshed from Google Patents.
EP0058412A2
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EP
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Electromagnetic helmet orientation determining system
Assignee: Honeywell Inc
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Filing: 1982-02-12
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Granted: —
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Expires: 2002-02-12
Abstract
Abstract An electromagnet system for determining the orientation including position of a helmet worn by a pilot is disclosed having a transmitting antenna (11) for transmitting electromagnetic field vectors, a receiving antenna (12) for sensing the electromagnetic field vectors generated by the transmitting antenna, and a control apparatus (22-62) responsive to the sensed electromagnetic field vectors and the transmitted electromagnetic field vectors for determining the compensated orientation of the helmet, the compensated orientation relying upon the rotation matrix determined by a previous solution for the orientation of the helmet.
Inventors
- 👤 Werner H. Egli
- 👤 Jeffrey M. Setterholm
- 👤 E. Jack Wier
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 11:01
CPC Classifications
G; G01; G01B; G01B7/00; G01B7/004; G01S; G01S5/00; G01S5/02; G01S5/0247; H; H01; H01F; H01F5/00; H01F5/02; H01F2005/027
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
117 words
An electromagnetic system for utilizing electromagnetic field vectors in determining the orientation of a helmet characterized by : transmitting means (11) for transmitting electromagnetic field vectors, said transmitting means including a transmitting antenna (13-16; Fig.3) having at least two transmitting coils; a receiving antenna (12) having three non-coplanar receiving coils (15,16,17;Fig.3) fixed to the helmet, said receiving coils sensing the electromagnetic field vectors transmitted by said transmitting antenna; and, control means (22-62;Fig.4) responsive to said electromagnetic field vectors received by said receiving antenna (12) for iteratively determining helmet orientation compensated for distortions of said electromagnetic field vectors caused by helmet metal mass, said control means having an output for supplying said compensated orientation to a utilization means.
Claim 2
Dependent Claim
117 words
An electromagnetic system for utilizing electromagnetic field vectors in determining the orientation of a helmet characterized by : transmitting means (11) for transmitting electromagnetic field vectors, said transmitting means including a transmitting antenna (13-16; Fig.3) having at least two transmitting coils; a receiving antenna (12) having three non-coplanar receiving coils (15,16,17;Fig.3) fixed to the helmet, said receiving coils sensing the electromagnetic field vectors transmitted by said transmitting antenna; and, control means (22-62;Fig.4) responsive to said electromagnetic field vectors received by said receiving antenna (12) for iteratively determining helmet orientation compensated for distortions of said electromagnetic field vectors caused by helmet metal mass, said control means having an output for supplying said compensated orientation to a utilization means.
Claim 3
Dependent Claim
127 words
System according to claim 1, characterized in that said control means comprises: orientation determining means (22-32,41-43,47,60-62) connected to said receiving antenna and to said transmitting means for iteratively determining a compensated orientation matrix for the receiving antenna by relying upon the rotation matrix for the rotation of the receiving antenna from the transmitting antenna of a previous iteration, said compensated orientation matrix being comprised of an orientation matrix which is compensated for distortions of said electromagnetic field vectors caused by helmet metal mass, said orientation matrix and said rotation matrix being based upon both the tramsmitted clectremagnetig fipln vectors and the sensed electromagnetic field vectors; and, output means (33) connected to said orientation determining means for providing an output signal for the control of a vehicle apparatus.
Claim 4
Dependent Claim
87 words
System according to claim 2; characterized in that said orientation determining means comprises means for compensating the orientation of the receiving antenna according to the formula where a is the compensation factor, S is a scalar based upon electronic and system gain, 6 is a matrix constant, H is the rotation matrix of a previous iteration, M' is a matrix based upon the unit direction vectors between the receiving antenna and the transmitting antenna, and R' is the range from the metal mass to the transmitting antenna.
Claim 5
Dependent Claim
36 words
System according to claim 1 or one of the following claims, characterized in that said control means comprises a multiplexer (25) having three inputs, one input connected to a corresponding receiving coil and having an output.
Claim 6
Dependent Claim
31 words
System according to claim 4, characterized in that said control means comprises an analog-to-digital converter (30,31) having an input connected to the output of said multiplexer and having a converter output.
Claim 7
Dependent Claim
33 words
System according to claim 5, characterized in that said input of said analog-to-digital converter comprises a bandpass filter (27) having an input connected to the output of said multiplexer (25) and an output.
Claim 8
Dependent Claim
21 words
System according to claim 6, characterized in that each of said inputs of said multiplexer (25) comprises a corresponding pre-amplifier (22,23,24).
Claim 9
Dependent Claim
36 words
System according to claim 7, characterized in that said input of said analog-to-digital converter further comprises a gain changeable amplifier (28) having an input connected to the output of said bandpass filter (27) and an output.
Claim 10
Dependent Claim
50 words
System according to claim 8, characterized in that said control means further comprises computer means (32) having an input connected to the output of said analog-to-digital converter (30,31) and further having said first output (33) connected to said utilization means and a digital-to-analog converter (43) having said second output (47,60,61,62,63).
References Cited (Backward Citations)
No citation records indexed.
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