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Class 342/31 - Including synchronized clock


Subclass of Class 342 - Communications: directive radio wave systems and devices (e.g., radar, radio navigation)
Definition: Subject matter including means to operate plural transponders
No. of patents: 13
Last issue date: 04/08/2008


NumberTitleIssue Date
7356618Method and system for synchronizing platform clocks in a distributed wireless platform
According to one embodiment of the present invention, a novel method and system are disclosed. In one embodiment, a first node records a first node local time of receiving a wirelessly transmitted packet, the first node local time recorded with a monotonically incre...
04/08/2008
7015856Device and method for SPR detection in a Mode-S transponder
A Mode-S transponder is provided for detecting synchronization phase reversal (SPR) signals. The transponder includes a receiver for receiving a Mode-S signal that contains a P6 pulse having a Mode-S data segment and an SPR signal therein. The transponder also inclu...
03/21/2006
6972718Position calculating method, signal receiver, and position calculating apparatus therefor
A method of measuring reception timings of signals transmitted and received between base stations and a mobile station and calculating the position of the mobile station by using the reception timings and the reception positions of the signals comprises the steps of...
12/06/2005
6771981Electronic device cover with embedded radio frequency (RF) transponder and methods of using same
A changeable cover for an electronic device and method of using same in a payment system is provided. The cover has a transponder responsive to interrogation by an electric field. The cover provides an electronic identification number and other information in respon...
08/03/2004
6211811Method and apparatus for improving the surveillance coverage and target identification in a radar based surveillance system
The surveillance system provides a means to measure Time Difference of Arrival (TDOA) and decode identification of signal source transmissions. TDOA and identification information received from a minimum of two receiving means is used to supplement non-co...
04/03/2001
5999116Method and apparatus for improving the surveillance coverage and target identification in a radar based surveillance system
The surveillance system provides a means to measure Time Difference of Arrival (TDOA) and decode identification of signal source transmissions. TDOA and identification information received from a minimum of two receiving means is used to supplement non-co...
12/07/1999
5696514Location and velocity measurement system using atomic clocks in moving objects and receivers
A coherent signal generated at a precise frequency determined by an atomic clock is transmitted by a moveable object. A receiver station compares the frequency of the coherent signal received from the moving object with a second coherent signal generated ...
12/09/1997
5453748Method and apparatus for responding to an interrogation signal
A transponder receives a stable reference frequency transmitted from an interrogator and compares the stable reference frequency to a local oscillator frequency that has short term stability. A comparison signal is provided to a synchronous oscillator for...
09/26/1995
5363109Method of correcting measurement errors caused by clock deviations in a secondary radar system
Conventional secondary radar systems use mechanically rotating antennas to radiate a concentrated beam that rotates in a horizontal plane. Data exchange between ground stations and airborne transponders can only take place if the aircraft is struck by the...
11/08/1994
5043903System for aiding the movement of moving units in group formation
A system for aiding the movement of moving units (aircraft such as helicopters) when flying in formation. Every unit transmits information to every other unit so that bidirectional communication links are established between all units in the formation. In...
08/27/1991
4232313Tactical nagivation and communication system
Method and apparatus are provided for the tactical nagivation and communiion of a community of aircraft. Each of the aircraft in the community is provided with an inertial navigation system capable of providing accurate short term navigational informatio...
11/04/1980
3943509Navigation aiding systems with one-way ranging and two-way synchronization
A navigation aiding system primarily for aircraft consists of a number of spaced apart ground stations. A ranging signal is transmitted to each of a number of aircraft in turn in response to received interrogation signals. The system allows a clock carrie...
03/09/1976
 
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