Magnetic-based tracking system
A vehicle movement tracking system that employs floor mats for generating location information using magnetic stripes, detectable with a magnetic sensor in a wheel of the vehicle. Two sensors are in a wheel of a vehicle. One sensor senses wheel rotation, and the other sensor senses a magnetic. The vehicle passes over a floor mat comprising magnetic stripes thereon that code the mat and thereby indicate the location at which the mat is at. When the vehicle travels over this mat, the magnetic sensor in the wheel detects the magnetic stripes and the wheel rotation sensor detects the distance between the magnetic stripes. In combination, these two sensors are used to create a location word that denotes the mat over which the vehicle passes over. The location word is stored in non-volatile memory and later uploaded to a location collection station.
1. A magnetic-based tracking system, said system comprising:
a vehicle having wheels on a surface of a substrate that the vehicle travels over;
a plurality of magnetic stripes on the substrate, wherein some of the magnetic stripes are spaced a first distance and others of the magnetic stripes are spaced a second distance, whereby the first distance represents a first logic value and the second distance represents a second logic value, and the first distance is greater than the second distance; and
one of the wheels of the vehicle comprises
a digital processor,
a rotation sensor coupled to the digital processor,
a magnetic sensor coupled to the digital processor,
a non-volatile memory coupled to the digital processor,
a real-time clock coupled to the digital processor,
a wireless communications device coupled to the digital processor, and
a power source;
wherein
when the magnetic sensor detects a magnetic stripe the digital processor is notified and the rotation sensor provides a wheel rotation value until a next magnetic stripe is detected,
a first logic value is determined when the wheel rotation value is greater than a predetermined rotation value and a second logic value is determined when the wheel rotation value is not greater than the predetermined rotation value,
the first or second logic value is stored; and
detection of another magnetic stripe and another next magnetic stripe continues for determining first or second logic values until the stored first and/or second logic values complete a location word, wherein the location word and an associated time stamp are stored in the non-volatile memory.
2. The magnetic-based tracking system according to claim 1 , wherein a microcontroller provides the digital processor, non-volatile memory, and real-time clock.
3. The magnetic-based tracking system according to claim 1 , wherein the magnetic sensor comprises a single-axis giant magnetoresistance (GMR) sensor.
4. The magnetic-based tracking system according to claim 1 , wherein the rotation sensor comprises a two-axis giant magnetoresistance (GMR) sensor.
5. The magnetic-based tracking system according to claim 1 , further comprising a location collection station for uploading the stored location words and associated time stamps, wherein when the vehicle travels over an upload coded substrate the stored location words and associated time stamps are sent via the wireless communications device to the location collection station.
6. The magnetic-based tracking system according to claim 1 , wherein the wireless communications device use LoRa (Long Rage) communications.
7. The magnetic-based tracking system according to claim 1 , wherein the wireless communications device uses communications selected from a group consisting of Wi-Fi, Bluetooth, Zigbee and Z-Wave.
8. The magnetic-based tracking system according to claim 1 , wherein the first logic level is a logic “0” and the second logic level is a logic “1”.
9. The magnetic-based tracking system according to claim 1 , wherein the first logic level is a logic “1” and the second logic level is a logic “0”.
10. The magnetic-based tracking system according to claim 1 , wherein the vehicle is selected from a group consisting of shopping cart, grocery cart, materials handling vehicle, fork-lift, hand cart, hand truck, platform truck, wheelbarrow and transportation vehicle.
11. A method for tracking a vehicle using a magnetic-based tracking system, said method comprising steps of:
detecting magnetic stripes on a substrate with a magnetic sensor located in a wheel of a vehicle rolling over the magnetic stripes on the substrate;
measuring angular rotations of the wheel between occurrences of the detected magnetic stripes;
comparing each of the measured angular rotations to a predetermined angular rotation value, wherein if the measured angular rotation is great than the predetermined angular rotation value then store a first logic value into a location word, and if not greater than the angular rotation value then store a second logic value into the location word until complete; and
time stamping the completed location word and storing the time in a non-volatile memory.
12. The method according to claim 11 , further comprising a step of storing a plurality of completed location words and respective time stamps representing where and when the vehicle rolled over a plurality of substrates at different locations.
13. The method according to claim 12 , further comprising a step of uploading the plurality of completed location words and respective time stamps to a location collection station.
14. The method according to claim 13 , wherein the step of uploading the plurality of completed location words and respective time stamps comprises the step of uploading the plurality of completed location words and respective time stamps to the location collection station when an upload location word is determined after the vehicle wheel passes over an upload coded substrate.
15. The method according to claim 13 , wherein the step of uploading the plurality of completed location words and respective time stamps comprises the step of uploading the plurality of completed location words and respective time stamps to the location collection station when the wheel of the vehicle is proximate thereto.
16. The method according to claim 11 , wherein the first logic level is a logic “0” and the second logic level is a logic “1”.
17. The method according to claim 11 , wherein the first logic level is a logic “1” and the second logic level is a logic “0”.
18. The method according to claim 11 , wherein the substrate is moveable to different locations.
19. The method according to claim 12 , wherein the plurality of substrates are a plurality of mats, wherein the plurality of mats are moveable to different locations.
20. The method according to claim 11 , further comprising a step of date stamping the completed location word and storing the date in the non-volatile memory.