# US 9,520,919 B2 · Magnetic wireless ground data link for aircraft health monitoring

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 9,520,919 B2
- Document ID: US9520919B2
- Status: Granted
- Kind: B2
- Application number: 14/168,412
- Filed: 2014-01-30
- Published: 2015-07-30
- Granted: 2016-12-13
- Earliest claimed: 2014-01-30
- Assignees: Simmonds Precision Products, Inc.
- Applicants: Simmonds Precision Products, Inc.
- Inventors: Sanjay Bajekal; Michael Anthony Lynch
- Web page: https://patentgrep.com/patent/US9520919B2

## CPC

- H01Q 7/00: Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
- H01Q 1/28: Adaptation for use in or on aircraft, missiles, satellites, or balloons
- H04B 5/26: using coils
- H04B 5/266: {One coil at each side, e.g. with primary and secondary coils}
- H04B 7/18506: {Communications with or from aircraft, i.e. aeronautical mobile service}
- H04L 67/12: specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A system and method of communicating a signal is disclosed. An aircraft is moved so that an aircraft-based coil is within a selected volume defined by a ground-based coil. A current is modulated in one of the aircraft-based coil and the ground-based coil to generate a magnetic field in the volume. A current generated in the other of the aircraft-based coil and the ground-based coil in response to the generated magnetic field is measured to communicate the signal.

## Claims

### Claim 1

A method of communicating a signal, comprising:
determining that aircraft-based coil is within a selected volume defined by a ground-based coil fixed in the ground, wherein the ground-based coil fixedly located underneath a ground surface;
modulating a current in one of the aircraft-based coil and the ground-based coil to generate a magnetic field in the volume; and
communicating the signal by measuring a current generated in the other of the aircraft-based coil and the ground-based coil in response to the generated magnetic field.

### Claim 2 (depends on 1)

The method of claim 1, wherein the ground-based coil is a horizontally-placed coil having a normal substantially perpendicular to a landing surface of the aircraft.

### Claim 3 (depends on 1)

The method of claim 1, further comprising using a Pulse Amplitude Width Modulation System to modulate the current to generate the magnetic field in the volume.

### Claim 4 (depends on 1)

The method of claim 1, further comprising obtaining multiple bits/baud transfer rate using the Pulse Amplitude Width Modulation System.

### Claim 5 (depends on 1)

The method of claim 1, wherein the signal further comprises data obtained at sensors of the aircraft during a flight of the aircraft.

### Claim 6 (depends on 1)

The method of claim 1, further comprising communicating the signal substantially simultaneously with an electric field communication occurring at the aircraft.

### Claim 7 (depends on 1)

The method of claim 1, wherein the selected volume is a volume that is affected by the magnetic field create via modulation of the current in the ground-based coil.

### Claim 8

A communication system, comprising:
a ground-based coil fixedly located underneath a ground surface;
a ground-based transceiver configured to generate and measure a magnetic field at the ground-based coil to communicate a signal;
an aircraft-based coil conveyed on an aircraft; and
a transceiver conveyed on the aircraft configured to generate and measure a magnetic field at the aircraft-based coil to communicate the signal.

### Claim 9 (depends on 8)

The system of claim 8, wherein the ground-based coil is a horizontally-placed coil having a normal substantially perpendicular to a landing surface of the aircraft.

### Claim 10 (depends on 8)

The system of claim 8, wherein at least one of the ground-based transceiver and the transceiver conveyed on the aircraft is configured to use a Pulse Amplitude Width Modulation System to generate the magnetic field in the volume.

### Claim 11 (depends on 8)

The system of claim 8, wherein a communication rate of multiple bits/baud transfer rate is achieved using the Pulse Amplitude Width Modulation System.

### Claim 12 (depends on 8)

The system of claim 8, wherein the signal communication occurs substantially simultaneously with an electric field communication occurring at the aircraft.

### Claim 13 (depends on 8)

The system of claim 8, further comprising the aircraft.

### Claim 14 (depends on 13)

The system of claim 13, wherein the aircraft is moved to a volume affected by a magnetic field of the ground-based coil to establish a communication link between the transceiver conveyed by the aircraft and the ground-based transceiver.