The purpose of this project is to design and implement a semi-trailer tracker remote unit. This unit will operate in the following manner. When detached from the semi tractor, an integral GPS receiver will determine the position of the trailer. The remote unit's microprocessor will process this data, and store the position data in the on-board memory. The position data will then be used to periodically generate a position message. The message will be sent to the trucking company's base of operations by way of a cellular data modem. In addition to periodic reports, the messages generated by the remote unit will alert the base of any abnormal conditions which arise, such as the trailer being moved, doors/compartments being opened, or low power conditions. 

The remote unit will also provide a logbook feature while the trailer is connected to a semi-tractor. In this mode, the unit will take periodic GPS position readings, and store the data in on-board memory. When the trailer is detached from the tractor, the remote unit will download the travel log to the base of operations as part of the normal message traffic. 
 

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