Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Reexamination Certificate
2001-03-09
2002-03-26
Tarcza, Thomas H. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
C455S456500
Reexamination Certificate
active
06362778
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to location systems and, more specifically, to a system able to locate and track a user retaining a portable locator unit using numerous location technologies including the Global Positioning Satellite (GPS) System and the generation of a beacon for use in pinpointing the location of the locator unit and thus the user.
2. Description of the Prior Art
Numerous types of location systems have been provided in the prior art. For example, U.S. Pat. Nos. 5,043,736; 5,485,163; 6,014,080; 5,014,040; 5,841,396; 6,064,336; 4,275,398; 4,673,936; 5,731,757; 6,014,080; 6,076,099; 6,100,806; 6,104,931; 6,111,538; 6,111,539; 6,140,956; 6,169,497; 6,172,640 and 5,874,914 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 suitable for the purposes of the present invention as heretofore described.
U.S. Pat. No. 5,043,736
Inventor: Ralph D. Damell, et al.
Issued: Aug. 27, 1991
The invention comprises a portable locator unit useful both as a cellular telephone and portable global positioning system that provides latitude and longitude information remotely to a base unit display. The system includes a small hand held receiver that receives signals from a satellite global positioning system and timing and computing circuits to provide location information signals. The hand held unit also includes a modem and transmitter to a cellular telephone network which is connected to the base unit computational system and display. The location of an individual or object can thus be determined at the remote station through the use of the cellular telephone network.
U.S. Pat. No. 5,485,163
Inventor: Martin H. Singer et al.
Issued Jan. 16, 1996
A system and method for locating a portable locator device in a communications network. The portable locator unit (PLU) (
4
) is activated either by an external signal (
62
) generated in response to remote activation source, such as a subscriber (
6
,
8
) or PLU detector (
106
,
108
), or by an internal activation signal triggered e.g. by the wearer. Once activated, the PLU (
4
) transmit a location signal (
66
). This location signal (
66
) is received by one or more network service nodes (
20
,
22
,
24
) which forward the information along with identifying service node information to a network location processor (
26
,
28
). After having determined the location of the PLU (
4
) from the received information, the network location processor (
26
,
28
) forwards this information to a designated source, such as the requested subscriber or other authorized user (
6
,
8
).
U.S. Pat. No. 6,014,080
Inventor: Hoyt M. Layson, Jr.
Issued: Jul. 11, 2000
Tamper resistant body-worn tracking device to be worn by offenders or potential victims for use in a wireless communication system receiving signals from a global positioning system (GPS). The tracking device directly communicates spacial coordinates to multiple remote sites. The tracking device is an enclosed case worn on a limb of a person. The case contains a battery, a signalling device, and a circuit board containing a field programmable gate array, a wireless data modem, a conventional GPS receiver, and a matching filtering GPS receiver.
U.S. Pat. No. 5,014,040
Inventor: Philip W. Weaver et al.
Issued: May 7, 1991
A personal locator transmitter adapted to be worn on the wrist and having the size and appearance of a conventional wrist-watch. This transmitter is provided with a programmable memory, a transmitter controlled by the memory, an antenna for reliably radiating signals from the transmitter regardless of orientation of the wrist of a user and including both a manually operable alarm activated by pressing a button, and an automatic alarm actuated by an attempt to remove the unit from the wrist of the wearer. The unit is controlled by a control memory comprised of an EPROM encoded with unique identification codes and other information as required in the specific application.
U.S. Pat. No. 5,841,396
Inventor: Norman F. Krasner
Issued: Nov. 24, 1998
A precision carrier frequency signal for calibrating a local oscillator of a GPS receiver which is used to acquire GPS signals. The precision carrier frequency signal is used to calibrate the local oscillator such that the output of the local oscillator, which is used to acquire GPS signals, is modified by a reference signal generated from the precision carrier frequency signal. The GPS receiver locks to this precision carrier frequency signal and generates the reference signal. In another aspect of the invention, satellite almanac data is transmitted to a remote GPS receiver unit from a basestation via a communication link. The remote GPS receiver unit uses this satellite almanac data to determine approximate Doppler data for satellites in view of the remote GPS receiver unit.
U.S. Pat. No. 6,064,336
Inventor: Norman F. Krasner
Issued: May 16, 2000
A precision carrier frequency signal for calibrating a local oscillator of a GPS receiver which is used to acquire GPS signals. The precision carrier frequency signal is used to calibrate the local oscillator such that the output of the local oscillator, which is used to acquire GPS signals, is modified by a reference signal generated from the precision carrier frequency signal. The GPS receiver locks to this precision carrier frequency signal and generates the reference signal. In another aspect of the invention, satellite almanac data is transmitted to a remote GPS receiver unit from a basestation via a communication link. The remote GPS receiver unit uses this satellite almanac data to determine approximate Doppler data for satellite in view of the remote GPS receiver unit.
U.S. Pat. No. 4,275,398
Inventor: William H. Parker, et al.
Issued: Jun. 23, 1981
A radio locator system uses transceivers located in a mobile and at least two stationary stations. Each stationary station serves as one end of a surveyor's baseline. Therefore, since the transceivers are located at opposite ends of a line having a known length, their broadcast signals provide direct distance measurements of two other lines extending between the individual stationary stations and the mobile unit, thereby cooperating with the known line to complete a trilateralization. Each station in the system is identified by a uniquely encoded stream of pulse bursts, each burst encompassing a wide, preprogrammed change of frequency for eliminating interference between the signals used in the locator system and the signals of other users of the same frequency band. An inversion of the preprogrammed frequency change is used for the return of the ranging system signal in order to substantially eliminate or suppress echo returns to the mobile or interrogator station. The sound of the preprogrammed station identifying frequency changes is sometimes called “chirping”.
U.S. Pat. No. 4,673,936
Inventor: Keigo Kotoh
Issued: Jun. 16, 1987
A small-sized transmitting apparatus for search and rescue operation (SARTR) adapted to be worn by a user for emitting a microwave rescue signal upon a marine accident involving the user. The SARTA includes a power supply, a transmitter unit energizable by the power supply and having a microwave oscillator, a transmitting antenna receiving of a microwave output from the transmitter unit for emitting the microwave rescue signal, a case accommodating the power supply, the transmitter unit, and the transmitting antenna and attachable directly to the user's body, or mountable on clothing or the like worn by the user for being carried thereby, and a switch unit mounted in the case for controlling the emission of the micromave rescue signal.
U.S. Pat. No. 5,731,757
Inventor: Hoyt M. Layson, Jr.
Issued: Mar. 24, 1998
A portable locator or tracking apparatus is provided for continuous location determination of subjects which communicates with a body-worn, non-removable, tamper resistant transceiver and a central data-base system. The portable tracking apparatus
Kroll Michael I.
Mull Fred H
Tarcza Thomas H.
LandOfFree
Personal location detection system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Personal location detection system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Personal location detection system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2851276