Asset tracking system with data ping based on asset movement
An asset tracking system that optimizes the value per ping by tying the ping to movement of the asset. The asset tracking device will send a ping to a remote host (i.e., receiver) when pre-determined condition(s) regarding the movement are met, conditions such as time between movements, the pattern of movement, and number of movements within a time period. In such a manner, the value per ping is optimized, leading to increased battery life and decreased operational cost. To satisfy these conditions and exception events, the asset tracking device is equipped with appropriate sensors, actuators, and trigger mechanism(s). The sensors and actuators detect movements and/or confirm or recognize a sequence of movements. When the detected movements and/or sequence of movements match a predetermined, recognized pattern or condition, the trigger mechanism is activated, after which a data ping is sent.
1. An RF tracking system comprising:
a transmitter comprising a power source, a GPS positioning element, a motion sensor, a two-way wireless RF communication module, a timer and control circuitry; and
a receiver; the transmitter configured to send data regarding the location of the transmitter to the receiver, and the receiver configured to receive the data from the transmitter;
the transmitter having a first sleep state, an idle state, a ping state, a second sleep state, and a transit state, wherein:
from the first sleep state, the transmitter will switch to the idle state if a first time period T1 has passed or if movement of the transmitter is detected by the motion sensor;
if movement is detected and a second time period T2 has not expired, the transmitter will switch to the ping state, send data regarding the location of the transmitter, and then return to the idle state;
if movement is detected and the second time period T2 has expired, if a sequence of at least N1 movement is detected within a third time period T3, the transmitter will switch to the transit state and then to the second sleep state; when in the second sleep state, the transmitter will check for continued movement; if movement is detected the transmitter will remain in the second sleep state, and if no movement is detected within a fourth time period T4, the transmitter will switch to the ping state, send data regarding the location of the transmitter, and then return to the idle state.
2. The tracking system of claim 1 wherein:
T1 is between 12 hours and 4 days;
T2 is between 20 and 60 seconds;
T3 is between 30 and 120 seconds; and
T4 is between 5 and 30 minutes.
3. The tracking system of claim 1 wherein the motion sensor comprises at least 3 degrees of freedom.
4. The tracking system of claim 3 wherein the motion sensor comprises at least 6 degrees of freedom.
5. The tracking system of claim 4 wherein the motion sensor comprises at least 9 degrees of freedom.
6. The tracking system of claim 3 wherein the motion sensor comprises a 3-axis accelerometer.
7. The tracking system of claim 6 wherein the motion sensor further comprises a 3-axis accelerometer.
8. The tracking system of claim 6 wherein the motion sensor further comprises a 3-axis gyroscope.
9. The tracking system of claim 6 wherein the motion sensor further comprises an altimeter.
10. The tracking system of claim 1 wherein the communication module is a ZigBee, ZigBee/LBT, or Low Energy BlueTooth communication module.
11. The tracking system of claim 1 wherein the communication module is a CDMA and/or GSM communication module.
12. A method of tracking an asset with a wireless RF system comprising a transmitter, the method comprising:
(a) beginning the tracking with the transmitter in a first sleep state;
(b) monitoring for movement from the first sleep state and checking a timer;
(i) if a first time period T1 has passed, switching to an idle state;
(ii) if movement is detected and a second time period T2 has not expired, the transmitter switching to a ping state, sending data regarding the location of the transmitter, and then switching to the idle state;
(iii) if movement is detected and the second time period T2 has expired, and if a sequence of at least N1 movements is detected within a third time period T3, switching to a transit state and then to a second sleep state;
(c) monitoring for movement from the second sleep state and checking a timer;
(i) if movement is detected the device will remain in the sleep state;
(ii) if no movement is detected within a fourth time period T4, the transmitter switching to the ping state, sending data regarding the location of the transmitter, and then switching to the idle state.
13. The method of claim 12 wherein (b)(iii) switching to a transit state and then to a second sleep state occurs if a sequence of at least 3 movements is detected.
14. The method of claim 12 wherein the first time period T1 is between 12 hours and 4 days has passed.
15. The method of claim 12 wherein second time period T2 is between 20 and 60 seconds.
16. The method of claim 12 wherein the third time period T3 is between 30 and 120 seconds.
17. The method of claim 12 wherein the fourth time period T4 is between 5 and 30 minutes.