US6414629B1 - Tracking Device - Google Patents > 자유게시판

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 a person with a GPS receiver is in a position to find out their own longitude and latitude to within several meters, in addition to their elevation. Dead-reckoning is effectively often known as a way of guiding ships, whereby the known velocity and route of journey of a ship from a known place is used to calculate the present position of the ship. Adverse weather circumstances 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 place via an RF signal to the receiver, which in flip calculates the position of the transmitter relative to that of the receiver. "line of sight" from its antenna to a receiver for reliable transmission is subject to potential signal loss when operated at the surface of the sea.

Waves can obscure the direct line of sight of the antenna, and may tend to submerge the transmitting antenna. This is particularly true for a transmitter that is worn or carried by a person floating on the floor of the water. Transmission of a signal, corresponding to an RF signal, may be obscured by waves, and the transmitter might be subject to immersion, leading to wasted power and iTagPro Tracker signal loss. This results in shortened transmitter battery life and decreased transmission reliability. Additional embodiments of the current invention can present an elevated stage of confidence that the location indicated for the person or object is correct. GPS receiver, a signal transmitter to ship a signal indicating a position of the target unit, and a processor to calculate an optimal time interval for transmission of the sign. GPS sign receiver, a compass to supply a reference route of the locating unit, a sign receiver to obtain the signal sent by the transmitter of the goal unit, a processor to calculate a variety and bearing from the locating unit to the target unit, and an indicator to show the range and bearing.

GPS receiver and a signal transmitter to ship a signal indicating a place of the goal unit. GPS signal receiver and a compass to supply a reference route of the locating unit. An indicator displays the vary, bearing and confidence degree. GPS receiver to determine a position of a gadget. GPS receiver to find out a position of the goal unit. GPS sign receiver and a compass to offer a reference path of the locating unit. An indicator displays the vary and bearing from the locating unit to the target unit. GPS signal at a target unit to determine a location of the target unit, receiving a GPS signal at a locating unit monitoring the target unit to determine a location of the locating unit, calculating an optimal time interval for transmission of a sign from the goal unit to the locating unit, where the sign contains the GPS location of the target unit, transmitting the signal from the target unit to the locating unit during the optimum time interval, and calculating a range and bearing from the locating unit to the goal unit.

GPS receiver and iTagPro Tracker a sign transmitter to ship a signal including a position of the monitoring unit. Preferred embodiments of the tracking device of the present invention can present elevated reliability of signal transmission from a transmitter to a receiver, and elevated confidence within the accuracy of the sign being sent. FIG. 1 is a schematic representation of a prior artwork personal tracking system shown in use in a man-overboard scenario. FIG. 2 is a block diagram exhibiting the parts of a personal monitoring system in accordance with the current invention. FIG. 3 is a plan view of a most well-liked 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 private monitoring system of FIG. 2 . FIG. 5 is a block diagram exhibiting the parts of a personal tracking system in accordance with an alternative embodiment of the current invention.

FIG. 6 is a block diagram displaying the parts of a personal monitoring system in accordance with one more alternative embodiment of the present invention. FIG. 7 is a block diagram exhibiting the parts of a private monitoring system in accordance with a further different embodiment of the present invention. 2 is shown in FIG. 1 in a man-overboard state of affairs. Four having a GPS device 6 is shown at the crest of a wave. Eight having a GPS device 6 is shown on the trough of a wave. GPS devices 6 embrace a transmitter that sends a signal 10 , e.g., an RF signal, to a GPS gadget 12 on a ship 14 . GPS device 12 has a receiver to obtain the indicators 10 sent by GPS units 6 . Each of the GPS devices ascertains its longitudinal and latitudinal position by buying indicators from GPS satellites sixteen that orbit the earth.