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An asset tracking system for use in a process control environment may include one or more asset tracking devices and an asset tracking host. The asset tracking device may receive signals corresponding to a position or location of an asset to be tracked, and may communicate, using an industrial autom

An asset tracking system for use in a process control environment may include one or more asset tracking devices and an asset tracking host. The asset tracking device may receive signals corresponding to a position or location of an asset to be tracked, and may communicate, using an industrial automation protocol such as wireless HART, an indication of the position to the asset tracking host. The signals may be GPS signals that are re-radiated into the process control environment. Other information, such as environmental data, may be communicated in conjunction with the position of the asset. The asset tracking host may store and/or display the data or information included in the message, and may send a different message to the asset tracking device. An asset tracking device may be included in a field device, a network device, or a portable communications device used in the process control environment.

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1. An asset tracking method used by an asset tracking device communicatively coupled to a communication network operating according to an industrial automation protocol, the method comprising: obtaining, by the asset tracking device, absolute positioning information associated with a global position

1. An asset tracking method used by an asset tracking device communicatively coupled to a communication network operating according to an industrial automation protocol, the method comprising: obtaining, by the asset tracking device, absolute positioning information associated with a global positioning system (GPS), the absolute positioning information indicative of an absolute spatial position of the asset tracking device;determining, by the asset tracking device, a relative spatial position of the asset tracking device based on the absolute positioning information, the relative spatial position defined in terms of one or more measures of distance in one or more directions from a spatial location of a known point of reference in the communication network other than the location of the asset tracking device, wherein the known point of reference is a portion of a structure, fixture, or equipment within a process control environment;determining, by the asset tracking device, positioning data indicative of the relative spatial position of the asset tracking device;generating, by the asset tracking device, a message conforming to the industrial automation protocol and including a content corresponding to at least a portion of the positioning data; andcausing the message to be transmitted from the asset tracking device to an asset tracking host via the communication network using the industrial automation protocol, the industrial automation protocol including messages defined for communicating information corresponding to controlling or monitoring process variables in the process control environment. 2. The method of claim 1, wherein generating, by the asset tracking device, the message comprises: generating a position indication field to indicate the relative spatial position of the asset tracking device;including the position indication field in the message; andpopulating the position indication field with the at least the portion of the positioning data. 3. The method of claim 1, wherein: the asset tracking device is a field device that performs at least one of controlling or monitoring a process variable used in a control loop in the process control environment; andthe asset tracking device is coupled to the communication network via a fully-enabled link to operate as a node in the communication network. 4. The method of claim 3, further including at least one of: generating alarm data to report an abnormal condition which the field device encounters during operation and wherein the message further includes the alarm data, orgenerating periodic update data to report periodic measurement of the process variable monitored by the field device and wherein the message further includes the periodic update data. 5. The method of claim 1, wherein the asset tracking device is a portable communication device configured to communicate with field devices operating in the process control environment, the field devices each performing at least one of controlling and monitoring a process variable used in a control loop in the process control environment. 6. The method of claim 5, wherein causing the message to be transmitted via the communication network includes causing the message to be transmitted to a field device operating in the communication network over a wireless join link, andwherein the wireless join link is configured to support communications between devices operating as nodes in the communication network and devices that do not operate as nodes in the communication network. 7. The method of claim 1, wherein generating the message that conforms to the industrial automation protocol includes generating the message in accordance with a wireless industrial automation protocol. 8. The method of claim 7, wherein the wireless industrial automation protocol is WirelessHART. 9. The method of claim 1, wherein generating the message that conforms to the industrial automation protocol comprises generating the message including the position indication field and further including at least one of a measurement or environmental information. 10. A asset tracking device operating in a communication network coupled to a process control environment, wherein the communication network operates according to an industrial automation protocol, the asset tracking device comprising: a network interface to communicate with the communication network according to the industrial automation protocol, the industrial automation protocol including messages defined specifically for communicating data related to controlling or monitoring process variables in process control environments;a positioning module coupled to a global positioning system (GPS) receiver to determine a spatial position of at least one of: (i) the asset tracking device, or (ii) a target device that is operating as a first node in the communication network and (a) that is co-located with the asset tracking device, or (b) into which the asset tracking device is incorporated;wherein the positioning module determines the spatial position being a relative spatial position determined based on an absolute spatial position determined based on a plurality of satellite signals received at the GPS receiver and the relative spatial position defined in terms of one or more measures of distance in one or more directions from a spatial location of a known point of reference in the process control environment other than the locations of the asset tracking device and the target device, wherein the known point of reference is a portion of a structure, fixture, or equipment within the process control environment; anda message generation unit configured to:generate a message that conforms to the industrial automation protocol and that includes an indication of the determined spatial position, andcause the message to be transmitted, using the industrial automation protocol and via the network interface, to a host operating as a second node in the communication network. 11. The asset tracking device of claim 10, wherein the message generation unit is further configured to: generate a position indication field in the message, andpopulate the position indication field with the indication of the determined spatial position. 12. The asset tracking device of claim 10, wherein: the target device is physically separate from the asset tracking device;the target device and the asset tracking device are coupled via a communication link; andthe message generation unit is configured to cause the message to be transmitted via the network interface, the communication link, and the target device to the host. 13. The asset tracking device of claim 12, wherein the communication link is a wireless communication link. 14. The asset tracking device of claim 10, wherein the network interface is a wireless interface. 15. The asset tracking device of claim 10, wherein the asset tracking device is a field device in the process control environment including a field function module to perform a physical function in the process control environment, and wherein the physical function corresponds to at least one of monitoring or controlling a process variable. 16. The asset tracking device of claim 10, wherein: the asset tracking device is a portable communication device; the portable communication device further comprising:an input device to receive commands from an operator, andan output device to display information to the operator; andthe target device is a field device in the process control environment comprising a field function module to perform a physical function in the process control environment, wherein the physical function corresponds to at least one of measuring or controlling a process variable. 17. An asset tracking method performed by a host communicatively coupled to a communication network that operates in a process control environment according to an industrial automation protocol, the method comprising: receiving, at the host from an asset tracking device incorporated into or co-located with an asset associated with the process control environment, a message conforming to the industrial automation protocol via the communication network, the industrial automation protocol including messages defined for transmitting data related to controlling or monitoring process variables in the process control environment, and the message including positioning data indicative of a spatial position of the asset, the positioning data based on a determination, made by the asset tracking device, of a relativity of the spatial position of the asset to a spatial position of a known exact location in the process control environment other than the locations of the asset tracking device and the asset, wherein such relativity is defined by one or more measures of distance in one or more directions from the spatial position of the known location, and wherein the known exact location indicates a portion of a structure, fixture, or equipment within the process control environment;automatically retrieving, using the host, an asset device description from a database, wherein the asset device description includes data descriptive of the asset;generating, by the host, asset tracking information based on the positioning data and the asset device description; andat least one of:storing, by the host, the asset tracking information in a data storage device, orpresenting, by the host, the asset tracking information via a user interface. 18. The method of claim 17, wherein: the asset is a field device that performs a physical function in the process control environment, wherein the physical function includes at least one of positioning, controlling, measuring or monitoring a process variable used in a control loop of the process control environment; andthe asset device description includes at least one of a type of the field device or a unique identifier of the field device. 19. The method of claim 18, wherein the asset tracking device is a portable communication device for monitoring and/or controlling field devices in the process control environment, and wherein the message further includes an indication of an identification of the asset. 20. The method of claim 19, further comprising: generating instructions in view of the positioning data; andtransmitting the instructions to the portable communication device via the communication network using the industrial automation protocol. 21. The method of claim 19, further comprising determining an identity of a user of the portable communication device. 22. The method of claim 17, wherein the positioning data includes global positioning system (GPS) coordinates. 23. The method of claim 17, wherein the industrial automation protocol is a wireless communication protocol. 24. The method of claim 17, further comprising: displaying, via the user interface, a map of a region corresponding to the spatial position of the asset; andwherein presenting the asset tracking information via the user interface includes displaying an indication of the spatial position of the asset on the map of the region. 25. The method of claim 24, wherein the indication of the spatial position of the asset includes at least one of: a schematic representation of the asset, a pictorial representation of the asset, or a unique identifier of the asset. 26. The method of claim 17, further comprising providing the user interface via a web service. 27. The method of claim 17, further comprising: receiving a plurality of messages corresponding to the asset, each message of the plurality of messages including respective positioning data; andstoring the respective positioning data in the database to generate historical positioning data corresponding to the asset. 28. An asset tracking host comprising: a network interface communicatively coupled to communication network operating in a process control environment according to an industrial automation protocol, wherein the industrial automation protocol includes messages defined specifically for communicating data related to controlling or monitoring process variables in the process control environment; andan asset tracking unit coupled to the communication network and configured to:receive, via the network interface, a message from an asset tracking device incorporated into or co-located with an asset, the message conforming to the industrial automation protocol and including positioning data indicative of a spatial position of the asset, the spatial position of the asset being a relative spatial location determined based on one or more measures of distance in one or more directions from a known absolute spatial location other than the locations of the asset tracking device and the asset, and the relative spatial location determined by the asset tracking device and indicated in terms of the absolute spatial location, and wherein the known absolute spatial location indicates a portion of a structure, fixture, or equipment within the process control environment;retrieve asset device description from a database, wherein the asset device description includes data descriptive of the asset; andgenerate asset tracking information based on the asset device description and the positioning data. 29. The asset tracking host of claim 28, further comprising a connection to a user interface that is configured to display at least one of the asset tracking information, the positioning data, the spatial position of the asset, or the asset device description. 30. The asset tracking host of claim 28, further comprising a connection to a storage device, and wherein the asset tracking unit is further configured to store at least one of the of the asset tracking information, the positioning data, or the spatial position of the asset in the storage device. 31. The asset tracking host of claim 28, wherein: the communication network is a wireless mesh communication network; andthe network interface is coupled to the communication network via a gateway device, wherein the network interface communicates with the gateway device over a wired communication link; andthe gateway device communicates with at least one node of the wireless mesh communication network via a wireless communication link. 32. The asset tracking host of claim 28, further comprising a notification unit to generate a notification to the asset in view of the positioning data of the asset, and cause the notification to be transmitted to the asset over the communication network via the network interface. 33. An asset tracking system operating in a process control environment, the asset tracking system comprising: a communication network including a plurality of nodes that communicate using an industrial automation protocol, the industrial automation protocol including messages defined specifically for communicating process data corresponding to one or more respective physical functions of one or more control loops in the process control environment, and the plurality of nodes in the communication network including: an asset tracking host, anda plurality of field devices, wherein each field device performs one or more respective physical functions corresponding to one or more control loops in the process control environment; andan asset tracking device configured to: determine a spatial position of the asset tracking device, the spatial position of the asset tracking device being a relative spatial location determined based on and indicated in terms of one or more measures of distance in one or more directions from a known absolute spatial position, wherein the known point of reference is a portion of a structure, fixture, or equipment within the process control environment;generate positioning data indicative of the spatial position of the asset tracking device; andprovide the positioning data to one of the plurality of field devices when the asset tracking device is co-located with the one of the plurality of field devices;wherein the absolute spatial position is of a location in the process control environment other than the locations of the asset tracking device and the one of the plurality of field devices with which the asset tracking device is co-located, andwherein the one of the plurality of field devices transmits, to the asset tracking host, the positioning data in a message that conforms to the industrial automation protocol. 34. The communication network of claim 33, wherein the asset tracking device generates the positioning data based on global positioning system (GPS) signals. 35. The communication network of claim 34, further comprising a set of re-radiating antennas to receive the GPS signals and re-radiate the GPS signals to the asset tracking device. 36. The communication network of claim 33, wherein the industrial automation protocol is a wireless communication protocol. 37. The asset tracking system of claim 33, wherein the message further includes at least one of: environmental information corresponding to the spatial position of the asset tracking device, or process control data corresponding to the one of the plurality of field devices. 38. An asset tracking method performed by a host communicatively coupled to a communication network that operates in a process control environment according to an industrial automation protocol, the method comprising: receiving, at the host via the communication network, messages corresponding to a particular asset of the process control environment, the messages conforming to the industrial automation protocol, the industrial automation protocol including messages defined for transmitting data related to controlling or monitoring process variables in the process control environment, and the messages including positioning data indicative of spatial positions of the particular asset, the positioning data indicative of the spatial positions of the particular asset in relation to one or more measures of distance in one or more directions from one or more spatial positions of one or more exact locations, the spatial positions of the particular asset determined by an asset tracking device co-located with or incorporated into the particular asset, and at least one of the exact locations is a known exact location other than the locations of the asset tracking device and the particular asset, wherein the known location indicates a portion of a structure, fixture, or equipment within a process control environment;storing contents of each of the messages and a respective indication of a time stamp in a data storage device; andpresenting at least a portion of the stored contents in response to a request. 39. The asset tracking method of claim 38, wherein receiving the messages corresponding to the particular asset comprises receiving messages corresponding to a physical or biological entity associated with the process control environment. 40. The asset tracking method claim 39, wherein: the physical entity associated with the process control environment is one of:a field device that performs at least one of controlling or monitoring a process variable used in a control loop in the process control environment,a physical location in the process control environment,a piece of equipment of the process control environment,a material used or produced in the process control environment, ora batch corresponding to the process control environment; andthe biological entity associated with the process control environment is a person. 41. The asset tracking method of claim 38, wherein presenting the at least the portion of the stored contents comprises presenting the at least the portion of the stored contents on a user interface. 42. The asset tracking method of claim 38, wherein presenting the at least the portion of the stored contents comprises sending the at least the portion of the stored contents to a computing device. 43. The asset tracking method of claim 38, wherein presenting the at least the portion of the stored contents in response to the request comprises presented the at least the portion of the stored contents in response to a request that includes a time interval.