US6414629B1 - Tracking Device - Google Patents
GPS receiver has a 24 hour a day line-of-sight view to a ample variety of satellites at any spot on the earth such that an individual with a GPS receiver is able to find out their very own longitude and iTagPro portable latitude to within a number of meters, as well as their elevation. Dead-reckoning is well generally known as a method of guiding ships, whereby the known velocity and ItagPro direction of journey of a ship from a recognized position is used to calculate the present place of the ship. Adverse weather situations may erode the accuracy of navigation by useless-reckoning. U.S. Pat. No. 5,781,one hundred fifty to Norris discloses a tracking device having an RF transmitter and an RF receiver, each of which have a constructed-in GPS receiver. GPS position through an RF signal to the receiver, which in turn calculates the position of the transmitter relative to that of the receiver. "line of sight" from its antenna to a receiver for dependable transmission is subject to potential sign loss when operated on the surface of the sea.
Waves can obscure the direct line of sight of the antenna, and should are likely to submerge the transmitting antenna. This is especially true for a transmitter that is worn or carried by a person floating on the surface of the water. Transmission of a sign, such as an RF sign, might be obscured by waves, and the transmitter will be topic to immersion, leading to wasted vitality and signal loss. This leads to shortened transmitter battery life and decreased transmission reliability. Additional embodiments of the current invention can present an elevated degree of confidence that the location indicated for the person or object is correct. GPS receiver, a sign transmitter to send a sign indicating a position of the target unit, iTagPro portable and a processor to calculate an optimum time interval for transmission of the signal. GPS signal receiver, a compass to supply a reference route of the locating unit, a signal receiver to obtain the signal despatched by the transmitter of the target unit, a processor to calculate a spread and bearing from the locating unit to the goal unit, and iTagPro portable an indicator to display the range and bearing.
GPS receiver and iTagPro portable a signal transmitter to send a sign indicating a place of the goal unit. GPS signal receiver and a compass to provide a reference direction of the locating unit. An indicator shows the vary, bearing and confidence degree. GPS receiver to find out a place of a machine. GPS receiver to determine a position of the goal unit. GPS signal receiver and a compass to offer a reference course of the locating unit. An indicator shows the range and bearing from the locating unit to the goal unit. GPS sign at a goal unit to determine a location of the goal unit, receiving a GPS signal at a locating unit monitoring the goal unit to find out a location of the locating unit, calculating an optimal time interval for iTagPro portable transmission of a signal from the target unit to the locating unit, where the sign contains the GPS location of the target unit, transmitting the sign from the target unit to the locating unit through the optimum time interval, and calculating a spread and iTagPro portable bearing from the locating unit to the goal unit.
GPS receiver and a sign transmitter to ship a signal together with a position of the monitoring unit. Preferred embodiments of the tracking device of the current invention can provide elevated reliability of signal transmission from a transmitter to a receiver, and elevated confidence in the accuracy of the signal being sent. FIG. 1 is a schematic representation of a prior art personal tracking system proven in use in a man-overboard scenario. FIG. 2 is a block diagram displaying the parts of a personal tracking system in accordance with the current invention. FIG. 3 is a plan view of a preferred embodiment of a graphical display of the personal monitoring system of FIG. 2 . FIG. Four is a plan view of an alternate embodiment of a graphical display of the personal tracking system of FIG. 2 . FIG. 5 is a block diagram exhibiting the components of a personal tracking system in accordance with another embodiment of the current invention.
FIG. 6 is a block diagram exhibiting the elements of a personal tracking system in accordance with one more various embodiment of the current invention. FIG. 7 is a block diagram showing the elements of a personal monitoring system in accordance with an additional alternative embodiment of the current invention. 2 is shown in FIG. 1 in a man-overboard situation. Four having a GPS system 6 is shown on the crest of a wave. 8 having a GPS device 6 is shown at the trough of a wave. GPS devices 6 embrace a transmitter that sends a signal 10 , e.g., an RF signal, ItagPro to a GPS device 12 on a ship 14 . GPS device 12 has a receiver to obtain the alerts 10 despatched by GPS gadgets 6 . Each of the GPS devices ascertains its longitudinal and latitudinal position by buying indicators from GPS satellites 16 that orbit the earth.