US6414629B1 - Tracking Device - Google Patents

GPS receiver has a 24 hour a day line-of-sight view to a adequate number of satellites at any spot on the earth such that an individual with a GPS receiver is in a position to determine their very own longitude and latitude to within a number of meters, as well as their elevation. Dead-reckoning is properly referred to as a way of guiding ships, whereby the recognized velocity and route of travel of a ship from a known position is used to calculate the present place of the ship. Adverse weather conditions can also erode the accuracy of navigation by lifeless-reckoning. U.S. Pat. No. 5,781,150 to Norris discloses a tracking device having an RF transmitter and an RF receiver, every of which have a built-in GPS receiver. GPS place by way of an RF sign to the receiver, ItagPro 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 iTagPro smart device dependable transmission is topic to potential signal loss when operated at the surface of the sea.

Waves can obscure the direct line of sight of the antenna, iTagPro device and may are inclined to submerge the transmitting antenna. This is especially true for a transmitter that's worn or carried by a person floating on the floor of the water. Transmission of a signal, resembling an RF signal, may be obscured by waves, and the transmitter could be topic to immersion, leading to wasted vitality and sign loss. This ends in shortened transmitter battery life and decreased transmission reliability. Additional embodiments of the present invention can provide an increased level of confidence that the placement indicated for the person or object is accurate. GPS receiver, a signal transmitter to ship a sign indicating a position of the target unit, and a processor to calculate an optimum time interval for transmission of the signal. GPS signal receiver, a compass to supply a reference course of the locating unit, a sign receiver to receive the signal despatched by the transmitter of the target unit, a processor to calculate a range and bearing from the locating unit to the goal unit, and an indicator iTagPro support to display the vary and bearing.

GPS receiver and a signal transmitter to ship a signal indicating a position of the goal unit. GPS signal receiver and iTagPro website a compass to offer a reference route of the locating unit. An indicator shows the range, iTagPro website bearing and confidence level. GPS receiver to determine a position of a device. GPS receiver to determine a position of the goal unit. GPS signal receiver and a compass to provide a reference direction of the locating unit. An indicator displays the vary and bearing from the locating unit to the goal unit. GPS sign at a goal unit to find out a location of the goal unit, receiving a GPS signal at a locating unit monitoring the target unit to find out a location of the locating unit, iTagPro support calculating an optimal time interval for transmission of a sign from the goal unit to the locating unit, iTagPro support the place the sign includes the GPS location of the goal unit, transmitting the signal from the goal unit to the locating unit through the optimal time interval, and calculating a range and iTagPro support bearing from the locating unit to the goal unit.

GPS receiver and a signal transmitter to ship a sign together with a place of the tracking unit. Preferred embodiments of the tracking device of the current invention can present increased reliability of sign transmission from a transmitter to a receiver, and increased confidence within the accuracy of the sign being despatched. FIG. 1 is a schematic representation of a prior artwork personal monitoring system shown in use in a man-overboard state of affairs. FIG. 2 is a block diagram displaying the parts of a private tracking system in accordance with the current invention. FIG. 3 is a plan view of a most popular embodiment of a graphical display of the private monitoring system of FIG. 2 . FIG. 4 is a plan view of another embodiment of a graphical show of the personal monitoring system of FIG. 2 . FIG. 5 is a block diagram exhibiting the elements of a private monitoring system in accordance with another embodiment of the present invention.

FIG. 6 is a block diagram displaying the parts of a private monitoring system in accordance with one more alternative embodiment of the present invention. FIG. 7 is a block diagram showing the elements of a personal monitoring system in accordance with an extra various embodiment of the current invention. 2 is shown in FIG. 1 in a man-overboard state of affairs. 4 having a GPS machine 6 is proven at the crest of a wave. Eight having a GPS gadget 6 is proven on the trough of a wave. GPS devices 6 embody a transmitter that sends a sign 10 , e.g., iTagPro support an RF sign, to a GPS gadget 12 on a ship 14 . GPS device 12 has a receiver to receive the alerts 10 despatched by GPS gadgets 6 . Each of the GPS devices ascertains its longitudinal and iTagPro support latitudinal position by acquiring signals from GPS satellites 16 that orbit the earth.