 Dual switch multimode array antenna |
| I claim: 1. An array antenna connectable to an input/output port forming an aperture to transmit or ... |
|
| Phase detection in an ink jet system printer of the charge amplitude controlling type |
| The present invention relates to an ink jet system printer of the charge amplitude controlling type ... |
|
| Apparatus and method for driving a magnetic print head |
| What is claimed is: 1. An electronic circuit for driving at least first and second sets of ... |
|
| Low volatility formulations of microencapsulated clomazone |
| We claim: 1. A process for the preparation of herbicidally effective formulations of clomazone ... |
|
|
Robust, efficient, location-related measurement
| Details |
Inventors: Maloney, John E.; Stevenson, James O.;
Assignee: KSI Inc. (King of Prussia, PA)
Primary Examiner: Le; Thanh Cong
Assistant Examiner: Tran; Pablo N
Attorney, Agent or Firm: Woodcock Washburn LLP
Replica correlation processing, and associated representative signal-data reduction and reconstruction techniques, are used to detect signals of interest and obtain robust measures of received-signal parameters, such as time differences of signal arrival and directional angles of arrival, that can be used to estimate the location of a cellularized-communications signal source. The new use in the present invention of signal-correlation processing for locating communications transmitters. This enables accurate and efficient extraction of parameters for a particular signal even in a frequency band that contains multiple received transmissions, such as occurs with code-division-multiple-access (CDMA) communications. Correlation processing as disclosed herein further enables extended processing integration times to facilitate the effective detection of desired communications-signal effects and replication measurement of their location-related parameters, even for the communications signals modulated to convey voice conversations or those weakened through propagation effects. Using prior, constructed, signal replicas in the correlation processing enables elimination of the inter-site communications of the signal representations that support the correlation analyses. Reduced-data representations of the modulated signals for voiced conversation, or for the variable components of data communications, are used to significantly reduce the inter-site communications that support the correlation analyses. |
|
DETAILED DESCRIPTION Determining the location of standard, wireless radio frequency (RF), communications transmitter/receivers ("transceivers") based on their communications offers the potential for emergency response services (fire, rescue and police) to more rapidly respond to calls for help.
Public safety and private security can all be aided by making available information concerning position and geographic location.
Technologies, such as those disclosed herein, do not require modifying standard communications devices in any way to facilitate the real-time determination of their locations.
The communications transceivers most popularly used by the general public are the mobile units (i.
e.
, "telephones") of cellularized communications systems.
Examples included the "cellular telephone" and "personal communications service" (PCS) systems.
Cellular communications systems typically use control-data messages to "manage" the transmitted power level of a mobile unit to limit its transmitted level to only that needed for successful communications reception within the controlling local "cell.
" This power management can limit the reception of the communications transmissions at multiple receiver sites and thus make more difficult the task of determining the transmitter's location.
Furthermore, when in use for communication, the wireless telephones are dedicated to voice or "traffic" transmission channels rather than control or "access" channels.
Thus, facilities are needed to locate the transmitters on any type of channel.
The present invention addresses these issues by providing robust and efficient means to extract parametric measurements from either or both of voice and control communications signals.
These measurements can then be used to support the localization processing that is needed to locate wireless communications transceivers.
Location data can be used to rapidly rout wireless calls to someone, or some agency, who is in a position to respond to the call.
Thus, the location information can support swift response to wireless emergency "9-1-1" calls
|
| Related patents |
|
|
Wireless terminal positioning method and apparatus
An object of the present invention is to improve precision in estimation. According to the present invention, the triangulation method is used to calculate a plurality ...
|
|
|
Apparatus and method for testing a memory array
The limitations inherent in the prior art are overcome by the present invention which provides a central ABIST controller which controls a plurality of ABIST test ...
|
|
|
Keyboard for personal information device
The present invention provides a compact easy-to-use M-key keyboard that requires a relatively insignificant amount of power to process the input data. The method ...
|
|
|
Computer input stylus and thickness control system
It is therefore one object of the present invention to provide an improved computer system. It is another object of the present invention to provide an improved computer-...
|
|
|
Word processor for generating Chinese characters
The main object of the present invention is to provide a word processor which is operable to produce and display desired Chinese characters on a monitor by inputting the ...
|
|
|
System and method for scaleable encoding and decoding of variable bit frames
In accordance with the invention there is provided a 1. A method of encoding and decoding data in a digital communication system comprising the steps of: a) providing a ...
|
|
|
Object position detector with edge motion feature and gesture recognition
OF A PREFERRED EMBODIMENT This application is a continuation-in-part of co-pending application Ser. No. 08/300,387, filed Sep. 2, 1994, which is a continuation-in-part ...
|
|
|
Method of using a nine key alphanumeric binary keyboard combined with a three key binary control keyboard
This invention uses any standard twelve key push-button phone keypad arrangement to produce full alphanumeric text, including a space, punctuation, symbols and control. T...
|
|
|
Font display and text editing system with character overlay feature
OF THE INVENTION Referring now to the drawings wherein like numerals indicate like elements, there is shown in FIG. 1 a font display and text editing system constructed ...
|
|
|
Multi-lobe antenna having a disc-shaped Luneberg lens
What is claimed is: 1. An antenna, operable within the micro wave range, comprising a round, disc-shaped lens with a radially varying refraction index, covered on at ...
|
|
|
Ring Tones 
