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Patent No. 5905461 Global positioning satellite tracking device (Neher, May 18, 1999)
Abstract
A global positioning and tracking system for locating one of a person and item of property. The global positioning and tracking system comprises at least one tracking device for connection to the one of the person and item of property including a processing device for determining a location of the tracking device and generating a position signal and a transmitter for transmitting said position signal. The position signal is transmitted to a relay station strategically positioned about a desired monitoring area. The relay station includes a device for receiving the positional signal and determining if the received position signal is a valid signal and a device for relaying the position signal upon determining the position signal is valid to a central monitoring station. The central monitoring station receives the validated positional signal from the relay station and analyzes the position signal for monitoring the position of the tracking device. The system may also include a tracking satellite for receiving the validated position signal from the relay station and re-transmitting the position signal to the central monitoring station when the central monitoring station is located outside the transmission range of the relay station.
Notes:
BACKGROUND
OF THE INVENTION
1. Field of the Invention
The present invention relates generally to tracking systems and, more specifically,
to a global positioning tracking system for locating the position of a person
or item anywhere at anytime.
2. Description of the Prior Art
Numerous tracking systems have been provided in the prior art. For example,
U.S. Pat. Nos. 5,289,163; 5,461,365; 5,461,390; 5,617,074 and 5,627,548 all
are illustrative of such prior art While these units may be suitable for the
particular purpose to which they address, they would not be as suitable for
the purposes of the present invention as heretofore described.
A child position monitoring device monitors the position of a child by detecting
the signal strength of a radio frequency carrier from a transmitter attached
to the child. If the signal of the radio frequency carrier is too weak, the
child is to far away from the adult who has the child position monitoring device.
When this happens, the adult is informed that the child has wandered too far
away through the use of an audio tone or through the use of vibrations coming
from the device. Once the adult is notified that the child is too far away,
the device also has a locating display for indicating the relative direction
of the child with respect to the adult The display uses eight LEDs arranged
around an emblem used to represent the position of the adult. The LED which
lights up indicates the relative direction of the child.
A personal alarm system includes a monitoring base station and one or more remote
sensing units in two-way radio communication. An electronic handshake between
the base station and each remote unit is used to assure system reliability.
The remote units transmit at selectable power levels. In the absence of an emergency,
a remote unit transmits at a power-conserving low power level. Received field
strength is measured to determine whether a remote unit has moved beyond a predetermined
distance from the base station. If the distance is exceeded, the remote unit
transmits at a higher power level. The remote unit includes sensors for common
hazards including water immersion, smoke, excessive heat, excessive carbon monoxide
concentration, and electrical shock. The base station periodically polls the
remote units and displays the status of the environmental sensors. The system
is useful in child monitoring, for use with invalids, and with employees involved
in activities which expose them to environmental risk. Alternative embodiments
include a panic button on the remote unit for summoning help, and an audible
beacon on the remote unit which can be activated from the base station and useful
for locating strayed children. In another embodiment, the remote unit includes
a Global Positioning System receiver providing location information for display
by the base station.
A locator device for monitoring the location of subjects, usable in conjunction
with a database system causes a polling signal to be sent periodically to each
of the subject's locator devices in the area. The locator device includes a
wireless transceiver to receive the polling message and, in response, query
a location determination device for the current location of the device. This
location is then sent back through the wireless network to the database. The
database determines from a record on that particular subject where that subject
is supposed to be at that time. If the subject being monitored is not within
the area where he or she is supposed to be, then the database may automatically
contact law enforcement officials.
A child finder basically consists of a transmitter which is concealingly attachable
to a child's body and which sends a signal to a conventional receiver so that
the child's location can be continually monitored. The transmitter will typically
be carried in an article of jewelry, such as a watch, bracelet, ring, or the
like, and will use a special on/off switch which allows the transmitter to be
activated only when the jewelry is being worn by the child. The switch includes
a reciprocal push button which closes the transmitter's electrical circuit when
depressed, and the button is spring-biasedly moved away from electrical contact
with the transmitter's circuit when the article of jewelry is not being worn.
To protect against inadvertent partial movement of the button which could break
electrical contact thus deactivating the transmitter an electrical contact surface
of the button is provided with an upwardly extending electrically conductive
spring finger which maintains continual electrical contact irrespective of temporary
and inadvertent reciprocal movement of the spring finger recedes into a provided
groove on the electrical contact surface of the button so as to prevent the
finger from causing interference between the primary electrical contact surfaces.
A navigation wrist wear device comprises a GPS receiver fully disposed in a
wrist watch type housing. A transparent microwave patch antenna is patterned
of indium-tin-oxide on sapphire in front of an LCD time, position and velocity
display. A bezel provides a protective window. A low-noise amplifier, down conversion,
code processing and navigation processing are all provided on a single integrated
circuit Photovoltaic solar cells to each side of the LCD help keep a battery
charged.
SUMMARY
OF THE PRESENT INVENTION
The present invention relates generally to tracking systems and, more specifically,
to a global positioning tracking system for locating the position of a person
or item anywhere at anytime.
A primary object of the present invention is to provide a global positioning
and tracking system that will overcome the shortcomings of prior art devices.
Another object of the present invention is to provide a global positioning and
tracking system which is able to locate individuals and personal property anywhere
around the world.
An additional object of the present invention is to provide a global positioning
and tracking system including a transmitter/receiver for attachment around an
individuals wrist or ankle or to an item of personal property.
A still further object of the present invention is to provide a global positioning
and tracking system that is operable in both a normal and standby mode.
An even further object of the present invention is to provide a global positioning
and tracking system including a remote transmitter/receiver within a band made
of an uncuttable material.
A still further object of the present invention is to provide a global positioning
and tracking system including a band having an identification code unique to
the particular band.
A yet further object of the present invention is to provide a global positioning
and tracking system including an emergency activation button for alerting a
main station as to the existence of an location of an emergency situation.
Another object of the present invention is to provide a global positioning and
tracking system that is simple and easy to use.
A still further object of the present invention is to provide a global positioning
and tracking system that is economical in cost to manufacture.
Additional objects of the present invention will appear as the description proceeds.
A global positioning and tracking system for locating one of a person and item
of property is described by the present invention. The global positioning and
tracking system comprises at least one tracking device for connection to the
one of the person and item of property including a processing device for determining
a location of the tracking device and generating a position signal and a transmitter
for transmitting said position signal. The position signal is transmitted to
a relay station strategically positioned about a desired monitoring area. The
relay station includes a device for receiving the positional signal and determining
if the received position signal is a valid signal and a device for relaying
the position signal upon determining the position signal is valid to a central
monitoring station. The central monitoring station receives the validated positional
signal from the relay station and analyzes the position signal for monitoring
the position of the tracking device. The system may also include a tracking
satellite for receiving the validated position signal from the relay station
and re-transmitting the position signal to the central monitoring station when
the central monitoring station is located outside the transmission range of
the relay station.
To the accomplishment of the above
and related objects, this invention may be embodied in the form illustrated
in the accompanying drawings, attention being called to the fact, however, that
the drawings are illustrative only, and that changes may be made in the specific
construction illustrated and described within the scope of the appended claims.
BRIEF DESCRIPTION OF THE DRAWING FIGURES
Various other objects, features and attendant advantages of the present invention
will become more fully appreciated as the same becomes better understood when
considered in conjunction with the accompanying drawings, in which like reference
characters designate the same or similar parts throughout the several views.
FIG. 1 is a perspective view of the global positioning and tracking system of
the present invention used for tracking the location of a child;
FIG. 2 is a perspective top view of a wristband used with the global positioning
and tracking system of the present invention worn by a user whose position is
to be tracked;
FIG. 3 is a perspective top view of a wristband used with the global positioning
and tracking system of the present invention, the wrist band being in an unlocked
position;
FIG. 4 is a perspective side view of the wristband used with the global positioning
and tracking system of the present invention;
FIG. 5 is a perspective side cross-sectional view of a wristband used with the
global positioning and tracking system of the present invention;
FIG. 6 is a schematic block diagram of the wristband used with the global positioning
and tracking system of the present invention; and
FIG. 7 is a flow chart describing the operating method of the global positioning
and tracking system of the present invention.
DESCRIPTION OF THE REFERENCED NUMERALS
Turning now descriptively to the drawings, in which similar reference characters
denote similar elements throughout the several views, the Figures illustrate
global positioning and tracking system of the present invention. With regard
to the reference numerals used, the following numbering is used throughout the
various drawing figures.
10 global positioning and tracking system of the present invention
12 central monitoring station of the global positioning and tracking system
of the present invention
14 tracking satellite of the global positioning and tracking system of the present
invention
16 local transmitter/receiver station of the global positioning and tracking
system of the present invention
18 wristband/tracking unit of the global positioning and tracking system of
the present invention
20 child wearing tracking device of the global positioning and tracking system
of the present invention
22 guardian of child
24 line indicating transmission of location signal between tracking unit and
relay station
26 line indicating transmission of location signal between relay station and
tracking satellite
28 line indicating transmission of location signal between relay station and
central monitoring station
30 line indicating transmission of location signal between tracking satellite
and central monitoring station
32 wrist of user wearing tracking unit
34 smooth outer surface of tracking unit
36 face plate of tracking unit for engraving decorative or identification information
thereon
38 locking mechanism
40 first shaft within first side of tracking unit
42 second shaft within first side of tracking unit
44 first side of tracking unit
46 second side of tracking unit
48 first prong extending from second side of tracking unit
50 second prong extending from second side of tracking unit
52 teeth on first prong
54 teeth on second prong
56 slide switch for transmitting distress signal
58 first position of slide switch
60 second position of slide switch
62 hinge
64 inner side of tracking unit
66 logic circuit within inner side of tracking unit
68 band of the tracking unit
70 transmission wire
72 first section of transmission wire
74 second section of transmission wire
76 first end of first section of transmission wire
78 second end of first section of transmission wire
80 first end of second section of transmission wire
82 second end of second section of transmission wire
84 microprocessor/logic device
86 power supply
88 memory
90 programmable EPROM
92 GPS logic circuit
94 input port connector
96 transmitter
98 emergency button
DETAILED DESCRIPTION OF THE PREFERRED
EMBODIMENT
Turning now descriptively to the drawings, in which similar reference characters
denote similar elements throughout the several views, FIGS. 1 through 6 illustrate
the global positioning and tracking system of the present invention indicated
generally by the numeral 10.
The global positioning and tracking system 10 is illustrated in FIG. 1 and includes
a central monitoring station 12, a tracking satellite 14, a local relay station
16 and a wristband/tracking unit 18. The central monitoring station 12 monitors
all movements of an activated tracking unit 18. The tracking unit 18 is attached
to an item of personal property or to an individual such as a child 20 as illustrated
in FIG. 1. The child 20 in the figure is being watched by a guardian 22 and
being tracked by the global positioning and tracking system 10. When the tracking
unit 18 is activated by the user 20 or the guardian 22 of the person or item
being tracked, the tracking unit 18 will transmit a both an identification signal
and a location signal to a nearby relay station 16 as is indicated by the line
labeled 24. The location signal 24 may also include an identification code for
the tracking unit 18 which will be compared to a data base of valid identification
codes indicative of all possible tracking units at the relay station 16. If
the location signal 24 is determined to be valid, the relay station 16 will
transmit the received signal to either the tracking satellite 14 as indicated
by the line labeled 26 or to a central monitoring station 12 as indicated by
the line labeled 28. The location signal will be transmitted directly to the
central monitoring station 12 if the relay station 16 is located within a predetermined
distance from the central monitoring station 12. If the location signal is transmitted
to the tracking satellite 14, the tracking satellite 14 will relay the signal
to the central monitoring station 12 as is indicated by the line labeled 30.
The signal received at the central monitoring unit 12 is then monitored to keep
track of the position of the tracking unit 18 anywhere in the world. The extent
of usefulness of the system 10 is based upon the range within which the tracking
units 18 can transmit signals and the number of relay stations 16 positioned
throughout the world to cover all areas in which a tracking unit 18 may be located.
An exemplary embodiment of a tracking unit 18 is illustrated in FIGS. 2-5. FIG.
2 illustrates the tracking unit 18 connected about the wrist 32 of a user 20.
The tracking unit 18 includes an outer surface 34 having a smooth texture. The
tracking unit 18 may also include a face plate 36 which may be engraved with
a child's name, a decoration to detract from the purpose of the device providing
an ornamental feature to the device or even any other type of identification
code. The tracking unit 18 is preferably made of an uncuttable material so that
it is difficult or even impossible to remove without the proper unlocking mechanism.
Thus, the tracking unit 18 can be used without worry for tracking the location
of a child, a prisoner or inmate out on a work release program or furlough,
senior citizens in need of medical care, personal property or even athletes
such as hikers or mountain climbers moving through dangerous areas.
FIG. 3 illustrates an exemplary locking mechanism 38 for use with the tracking
device 18 for connecting about the wrist 32 of the user 20. The locking mechanism
38 includes first and second prong shafts 40 and 42, respectively, on a first
side 44 of the tracking unit 18. Extending from a second side 46 of the tracking
unit 18 are first and second prongs 48 and 50, respectively. The first and second
prongs 48 and 50 each include a top side having teeth 52 and 54 extending along
a length thereof. In order to lock the tracking device 18 around a wrist 32
of the user 20, the first and second prongs 48 and 50 are inserted into respective
ones of the first and second shafts 40 and 42. The teeth 52 and 54 on each of
the prongs 48 and 50 releasably engage with the inner side of the respective
shafts 40 and 42 for locking the tracking unit 18 closed. The locking mechanism
38 may be provided with a variety of possible locking mechanisms such as keys,
combination locks, electronic locks, etc. to prevent the tracking device from
being detached from the item or person once attached.
FIG. 4 illustrates the tracking unit 18 in an unattached condition, not connected
to a user or item of personal property. This view illustrates a slide switch
56 for initiating transmission of a distress signal to the relay station 16
on a side of the unit 18. The slide switch 56 is movable between a first position
58 in which the distress signal is not transmitted and a second position 60
in which the tracking unit 18 is activated for transmitting the distress signal.
The distress signal will be continuously transmitted until the user or another
person moves the slide switch 56 back to the first position 58. The slide switch
56 must over come a frictional force to move between the first and second positions
58 and 60 and thus will not be unconsciously or unintentionally activated to
transmit the distress signal. Also seen from this figure is a hinge 62. As the
tracking unit 18 is made of a somewhat rigid inflexible material, the hinge
62 allows the first and second sides 44 and 46 to be separated when the tracking
device 18 is either being placed about the wrist of the user or being removed
therefrom.
A cross-sectional view of the tracking unit 18 is illustrated in FIG. 5. Within
an interior 64 of the tracking unit 18 is a logic circuit 66. Extending within
a band 68 of the tracking unit 18 is a transmission wire 70. The transmission
wire 70 is formed of first and second sections 72 and 74 respectively. The first
section 72 includes a first end 76 connected to the logic circuit 66 and a second
end 78 extending to the second end 46 of the tracking unit 18. The second section
74 includes a first end 80 connected to the logic circuit 66 and a second end
82 extending to the first end 44 of the tracking unit 18. When the locking mechanism
38 is closed joining the first and second sides 44 and 46, the first and second
sections 72 and 74 of the transmission wire are connected to complete a full
circuit with the logic circuit 66. When the circuit is broken such as if the
band 68 is cut or the locking mechanism 38 is broken to release the tracking
unit 18 from its position, the tracking unit 18 will automatically transmit
the distress signal to alert the central monitoring station 12 as to the present
situation.
A schematic block diagram of the tracking unit 18 of the global positioning
and tracking system 10 is shown in FIG. 6. As is clearly shown in this figure
the tracking unit 18 includes a microprocessor/logic device 84. The microprocessor/logic
device 84 is connected to receive operating power from a power supply 86. The
power supply 86 may be any type of battery which is small enough to fit within
the inner side 70 of the tracking device 18 or may even be a solar powered battery
for powering the logic circuit Also connected to the microprocessor/logic device
84 is a memory unit 88 for storing the identification number and distress signal
information, a programmable EPROM 90 for storing the operating software for
the microprocessor/logic device 84 and a Global Positioning Satellite (GPS)
logic circuit 92 for use in calculating the longitudinal, latitudinal and elevational
position of the tracking unit 18 for transmission to the microprocessor/logic
device 84 and ultimate transmission to the central monitoring station 12. An
input port connector 94 is connected to the microprocessor/logic device 84 for
use in inputting the identification information for storage in the memory 88.
A transmitter 96 is connected to the microprocessor/logic device 84 for transmission
of the identification information, GPS information and distress signals to the
relay station 16 for ultimate transmission to the central monitoring station
12. An emergency button (slide switch) 98 is also connected to initiate transmission
of the distress signal when activated or when the band of the tracking unit
is cut or the lock is opened without proper authorization.
The operation of the global positioning and tracking system 10 will now be described
with reference to the figures and specifically to the flow chart of FIG. 7.
In operation, the tracking unit 18 is programmed with an identification code
or number unique to the particular unit either upon manufacturing or using an
external programming device connected to the input port connector as described
in step S2. The tracking unit 18 is then assigned a specific frequency range
at which it may transmit the identification signal along with any distress signals
and location information as stated in step S4. The frequency is determined based
upon the specific use of the particular tracking unit 18 such as for law enforcement,
personal security companies, child protection or locating personal property
and the particular frequency range at which the relay stations are set for receiving
transmitted signals. The tracking unit 18 may also be programmed with a subscriber
ID number, each specific subscriber number providing particular service to the
individual devices as discussed in step S6. This allows users to find tracking
devices that would suit their personal intended uses.
The tracking device is now ready for operation and is connected to the particular
individual or piece of personal property to be tracked as described in step
S8. This is done by locking the tracking unit 18 to complete the circuit extending
therethrough. The tracking unit 18 will then begin transmitting an identification
signal once the locking mechanism is engaged as stated in step S10. The longitudinal,
latitudinal and elevational position of the tracking unit is continually calculated
by the GPS logic circuit upon engagement of the locking mechanism as discussed
in step S12. The tracking unit 18 continually transmits the positional signal
and identification signal to the relay station 16 as stated in step S14. The
relay station 16 then enhances the received signal and relays the transmitted
positional and identification signals to the tracking satellite 14 as discussed
in step S16. The tracking satellite then retransmits the enhanced positional
and identification signals to the central monitoring station 12 as described
in step S18. If it is detected that the band of the tracking device has been
cut to open the circuit or the emergency button has been activated, the tracking
unit 18 will automatically transmit a distress signal in the same manner as
described above and stated in step S20.
From the above description it can be seen that the global positioning and tracking
system of the present invention is able to overcome the shortcomings of prior
art devices by providing a global positioning and tracking system which is able
to locate individuals and personal property anywhere around the world. The global
positioning and tracking system including a transmitter/receiver for attachment
around an individuals wrist or ankle which is operable in both a normal and
standby mode and contained within a band made of an uncuttable material. Each
band of the global positioning and tracking system has an identification code
unique to the particular band for identification and location purposes and an
emergency button for transmitting a distress signal when the wearer is in need.
Furthermore, the global positioning and tracking system of the present invention
is simple and easy to use and economical in cost to manufacture.
It will be understood that each of the elements described above, or two or more
together may also find a useful application in other types of methods differing
from the type described above.
While certain novel features of this invention have been shown and described
and are pointed out in the annexed claims, it is not intended to be limited
to the details above, since it will be understood that various omissions, modifications,
substitutions and changes in the forms and details of the device illustrated
and in its operation can be made by those skilled in the art without departing
in any way from the spirit of the present invention.
Without further analysis, the foregoing will so fully reveal the gist of the
present invention that others can, by applying current knowledge, readily adapt
it for various applications without omitting features that, from the standpoint
of prior art, fairly constitute essential characteristics of the generic or
specific aspects of this invention.
To the accomplishment of the above and
related objects, this invention may be embodied in the form illustrated in the
accompanying drawings, attention being called to the fact, however, that the
drawings are illustrative only, and that changes may be made in the specific
construction illustrated and described within the scope of the appended claims.