Tracking system

1. A tracking system comprising:

a tag reader comprising an interrogating antenna;

one or more tags comprising:

an electrical energy generator configured to convert environmental energy to electrical energy, wherein the electrical energy generator is more than one generation element selected from:

a mechanical to electrical energy convertor;

a thermoelectric generator;

a solar electricity generator;

a piezo generator; and

an RF power generator

a control circuit configured to manage the electrical energy generated by the more than one generation elements;

a radio frequency, RF, communication circuit;

one or more sensors;

a controller configured to:

use the electrical energy generated by the electrical energy generator to transmit a data signal to the tag reader using the RF communication circuit and include data generated by the one or more sensors in the data signal;

an energy storage device configured to store electrical energy provided by the electrical generator and to supply the stored electrical energy for use by the controller and RF communication circuit; and

a management unit configured to prevent the tag from operating when insufficient power is available.

2. The tracking system of claim 1 , wherein the tag reader further comprises a wireless network interface, the tracking system further comprising:

a receiving server configured to receive data from the wireless network interface of the tag reader, the received data including information associated with the data signal from the tag; and

a database configured to store the received data.

3. The tracking system of claim 2 , wherein the receiving server is configured to send a request to the tag reader and the data is received in response to the request.

4. The tracking system of claim 1 , wherein the tag further comprises an energy storage device configured to store electrical energy provided by the electrical energy generator and to supply the stored electrical energy for use by the controller and RF communication circuit.

5. The tracking system of claim 1 , wherein the RF communication circuit of the tag is a transceiver and the tag reader is configured to send an interrogating signal to the tag and further wherein the tag is configured to transmit the data signal to the tag reader in response to the interrogating signal, wherein the tag is further configured to generate from the interrogating signal electrical energy to power the RF communication circuit and the controller.

6. A tag comprising:

an electrical energy generator configured to convert environmental energy to electrical energy, wherein the electrical energy generator is more than one generation element selected from:

a mechanical to electrical energy convertor;

a thermoelectric generator;

a solar electricity generator;

a piezo generator; and

an RF power generator;

a control circuit configured to manage the electrical energy generated by the more than one generation elements;

a radio frequency, RF, communication circuit;

one or more sensors;

a controller configured to use the electrical energy generated by the electrical energy generator to transmit a data signal to the tag reader using the RF communication circuit and include data generated by the one or more sensors in the data signal;

an energy storage device configured to store electrical energy provided by the electrical generator and to supply the stored electrical energy for use by the controller and RF communication circuit; and

a management unit configured to prevent the tag from operating when insufficient power is available.

7. The tag of claim 6 , wherein the energy storage device is a capacitor or a secondary battery.

8. The tag according to claim 1 , wherein the controller is further configured to include data generated by the one or more sensors in the data signal, the tag further comprising:

a memory store configured to store the data generated by the one or more sensors.

9. The tag of claim 8 , wherein the one or more sensors measure any one or more of: humidity, vibration, movement, motion, gyroscope, acceleration, GPS, temperature, light or sound.

10. The tag according to claim 6 , wherein the communication circuit is a transceiver and the controller is further configured to receive an interrogating signal from the RF tag reader and to transmit the data signal to the tag reader in response to the interrogating signal.

11. The tag according to claim 6 further comprising an RF to DC conversion circuit.

12. The tag according to claim 6 further configured to record data acquired from the electrical generator; and

a memory store configured to store the data acquired from the electrical generator.

13. A method for operating a tag having an electrical energy generator configured to convert environmental energy to electrical energy, wherein the electrical energy generator is more than one generation element selected from:

a mechanical to electrical energy convertor;

a thermoelectric generator;

a solar electricity generator;

a piezo generator; and

an RF power generator;

a control circuit configured to manage the electrical energy generated by the more than one generation elements;

and a radio frequency, RF, communication circuit;

one or more sensors;

a controller configured to use the electrical energy generated by the electrical energy generator to transmit a data signal to the tag reader using the RF communication circuit and include data generated by the one or more sensors in the data signal;

an energy storage device configured to store electrical energy provided by the electrical generator and to supply the stored electrical energy for use by the controller and RF communication circuit; and

a management unit configured to prevent the tag from operating when insufficient power is available, the method comprising the step of:

using electrical energy generated by the electrical energy generator to transmit a data signal to a tag reader using the RF communication circuit.

14. The method of claim 13 , wherein the data signal includes an identifier of the tag.

15. The method of claim 13 further comprising the steps of:

acquiring data from the electrical energy generator of the tag; and

storing the data before transmitting the data signal, including the acquired data, to the tag reader.

16. The method of claim 15 , wherein the acquired data indicates any one or more of:

a time period that electrical energy was being generated by the electrical energy generator;

a power level generated by the electrical energy generator;

a number of times the electrical energy generator was generating power; and

a number of times the electrical energy generator reached one or more threshold power levels.

17. The method of claim 15 further comprising the step of:

determining any one or more of: a cycle number, operation number, operation time; a service interval, number of aircraft flights, and abnormal operation characteristic, of a component attached to the tag based on the acquired data,

wherein the determining step further includes analysing a plurality of data items within the acquired data to determine a repeated series of events defined by the plurality of data items, and

wherein the tag is attached to any of: an aircraft, an engine, a power unit, an auxiliary power unit, thrust reverser; and landing gear.