Systems and methods for tracking multiple collocated assets

• US 10,473,750 B2
• Filed: 12/08/2016
• Issued: 11/12/2019
• Est. Priority Date: 12/08/2016
• Status: Active Grant

• Current Assignee: CalAmp Corporation
• Original Assignee: CalAmp Corporation
• Inventors: Hergesheimer, Peter
• Primary Examiner(s): Batista, Marcos
• Application Number:
  US15/373,277
• Publication Number:
  US 20180164401A1
• Time in Patent Office: 1,069 Days
• Field of Search: 4554561-4563
• CPC Class Codes: G01S 11/06 using intensity measurements
• CPC Class Codes: G01S 5/02521 using a radio-map
• CPC Class Codes: G01S 5/0284 Relative positioning
• CPC Class Codes: G01S 5/0294 Trajectory determination or predictive filtering, e.g. target tracking or Kalman filtering

Abstract

Systems and methods for locating collocated assets in accordance with embodiments of the invention are disclosed. In one embodiment of the invention, an asset tracking device includes a processor, a memory connected to the processor, and a communications device connected to the processor, wherein the processor obtains asset signal data, where the asset signal strength data includes asset data identifying an asset, calculates asset signal strength data based on the obtained asset signal data, and determines chained asset data based on the asset signal data and the asset signal strength data, where the chained asset data identifies a set of assets chained to a master asset associated with the asset tracking device.

Claims

1. An asset tracking device, comprising:

a processor;

a memory connected to the processor; and

a communications device connected to the processor;

wherein the processor;

obtains asset signal data, where the asset signal strength data comprises asset data identifying an asset being tracked;

calculates asset signal strength data based on the obtained asset signal data;

determines chained asset data based on the asset signal data and the asset signal strength data, where the chained asset data identifies a set of collocated tracked assets chained to a master asset associated with the asset tracking device;

wherein the asset signal data further comprises synchronization data common to the set of collacated tracked assets; and

wherein the processor further determines the chained asset data based on the synchronization data.

2. The asset tracking device of claim 1, wherein the processor determines the location of the asset relative to the asset tracking device based on the asset signal strength data.

3. The asset tracking device of claim 1, wherein:

the asset tracking device further comprises a location determination device connected to the processor; and

the processor further determines absolute location data using the location determination device.

4. The asset tracking device of claim 3, wherein the processor further determines the absolute location of the asset based on the absolute location data and the asset signal strength data.

5. The asset tracking device of claim 1, wherein the processor further transmits the chained asset data to a remote server system using the communications device.

6. The asset tracking device of claim 1, wherein the communications device comprises as a cellular modern.

7. The asset tracking device of claim 1, wherein:

the communications device comprises a radio frequency transceiver; and

the asset signal data is received using the communications device.

8. The asset tracking device of claim 7, wherein the radio frequency transceiver comprises a Bluetooth Low Energy radio.

9. The asset tracking device of claim 1, wherein the synchronization data comprises brake lighting system voltage data.

10. The asset tracking device of claim 1, wherein the synchronization data comprises counter data.

11. The asset tracking device of claim 1, wherein:

the asset tracking device comprises a diagnostic connector; and

the asset tracking device is connected to a vehicle diagnostic connector in an asset.

12. An asset tracking system, comprising:

a set of collocated asset tracking devices, wherein each asset tracking device comprises a processor, a memory connected to the processor, and a communications device; and

wherein at least one asset tracking device in the set of collocated asset tracking devices;

transmits asset signal data;

obtains asset signal data from at least one asset tracking device in the set of collocated asset tracking devices;

determines aggregate signal strength data for each of the other asset tracking devices in the set of collocated asset tracking devices based on the obtained asset signal data;

calculates asset position data for every other asset tracking device in the set of collocated asset tracking devices based on the aggregate signal strength data; and

wherein each asset tracking device in the set of collocated asset tracking devices is associated with an asset being tracked, wherein each asset tracking device in the set of collocated asset tracking devices is connected to a synchronization signal on its associated asset; and

wherein the asset signal data comprises synchronization data that is (1) common to the set of collocated asset tracking devices and (2) determined based on the synchronization signal.

13. The asset tracking system of claim 12, wherein:

a master asset tracking device in the set of collocated asset tracking devices further comprises a location determination device; and

a master asset tracking device;

determines absolute position data describing the location of the master asset tracking device using the location determination device; and

determines asset position data describing the location of the other asset tracking devices in the set of collocated asset tracking devices based on the absolute position data and the asset position data.

14. The asset tracking system of claim 13, wherein the master asset tracking device further transmits the asset position data to a remote server system.

15. The asset tracking system of claim 12, wherein:

the communication device comprises a low power radio frequency transceiver; and

each asset tracking device in the set of collocated asset tracking devices transmits the asset signal data using the communications device.

16. A method for determining the location of an asset, comprising:

obtaining asset signal data using an asset tracking device, where the asset signal strength data comprises asset data identifying an asset being tracked and the asset tracking device comprises a processor, a memory connected to the processor, and a communications device;

calculating asset signal strength data based on the obtained asset signal data using the asset tracking device;

determining chained asset data based on the asset signal data and the asset signal strength data using the asset tracking device, where the chained asset data identifies a set of collocated tracked assets chained to a master asset associated with the asset tracking device;

wherein the asset signal data further comprises synchronization data common to the set of collocated tracked assets; and

wherein the determining chained asset data further comprises determining the chained asset data based on the synchronization data.

17. The method of claim 16, further comprising determining relative location data for the asset based on the asset signal strength data using the asset tracking device.

18. The method of claim 16, further comprising transmitting the chained asset data to a remote server system using the asset tracking device.