Abstract: Systems and methods for monitoring safety of work vehicles and worksites. Work vehicles and worksites may be provided with target object sensor units for detecting a condition regarding safety determinative aspects of the work vehicle or worksite. The target object sensor units communicate data regarding the safety determinative aspects to a data acquisition and communication unit that produces safety status data. The safety status data is analyzed to determine whether to issue a notification to a notification unit to alert workers of an unsafe condition. The data acquisition and communication unit transmits the safety status data to a server/processing unit for further analysis. The server/processing unit may track the safety status data regarding each worksite or work vehicle and generate statistical data regarding the safety status data. The server/processing unit may communicate with user interface to display notifications and statistical data.

Abstract: Systems and methods for monitoring safety of work vehicles and worksites. Work vehicles and worksites may be provided with target object sensor units for detecting a condition regarding safety determinative aspects of the work vehicle or worksite. The target object sensor units communicate data regarding the safety determinative aspects to a data acquisition and communication unit that produces safety status data. The safety status data is analyzed to determine whether to issue a notification to a notification unit to alert workers of an unsafe condition. The data acquisition and communication unit transmits the safety status data to a server/processing unit for further analysis. The server/processing unit may track the safety status data regarding each worksite or work vehicle and generate statistical data regarding the safety status data. The server/processing unit may communicate with user interface to display notifications and statistical data.

Abstract: A cellular telephone mobile unit position determining method which utilizes a plurality of range transceivers located at known fixed locations adapted to transmit approximately synchronized digital range signals. The method is especially adapted to determine the position of a cellular mobile unit within cellular service areas for determining billing charges and/or access restrictions. According to the invention, the fixed position range transceivers transmit range signals which are received by a mobile unit. The mobile unit determines either the time difference of arrival or absolute time of arrival of the range signals, which in turn is used to determine the mobile unit's position for cellular billing and/or access restriction purposes. The range transceivers are operable to receive an error signal and correspondingly adjust the output of the next transmitted range signal so as to drive the detected synchronization error to approximately zero.