Patent
Method and apparatus for reducing the effects of impulse noise in Loran-C receivers
Reads0
Chats0
TLDR
In this paper, the effects of impulse noise on the operation of a microprocessor-controlled Loran-C receiver are reduced by muting or attenuating the received signals in the front end of the receiver ahead of receiver gain during a time period which preceeds the start time of the pulses being tracked.Abstract:
The effects of impulse noise on the operation of a microprocessor-controlled Loran-C receiver are reduced by muting or attenuating the received signals in the front end of the receiver ahead of the receiver gain during a time period which preceeds the start time of the pulses being tracked. The attenuation is selectively removed after the start time of each pulse being tracked to permit the receiver to perform its time difference of pulse arrival measurements in the normal manner. The attenuation is also selectively removed during those time periods in which the receiver performs its envelope slope, skywave/groundwave and other such samplings. The attenuation is provided by a muting circuit which is controlled by a time gate signal that derives from the microprocessor of the receiver.read more
Citations
More filters
Patent
Methods and apparatus for transmitting data between different peer-to-peer communication groups
TL;DR: In this article, a wireless device determines (702) if it is simultaneously connected to a plurality of P2P communication groups and instantiates (704) a bridge interface (404) at the wireless device (102) for communications between each peer-to-peer communication group (104).
Patent
Printing of pixel locations by an ink jet printer using multiple nozzles for each pixel or pixel row
TL;DR: In one approach, used either for single color or multicolor images, multiple droplets of the same color are deposited upon a single pixel location from two different nozzles as discussed by the authors.
Patent
Method and apparatus for generating reference signals for accurate time-difference of arrival estimation
TL;DR: In this paper, a base station communicates a positioning reference signal (PRS) to wireless communication devices over a downlink in a wireless communication system by encoding a PRS into a first set of transmission resources, encoding other information into a second set of transmissions, and multiplexing the two sets of resources into a subframe such that the one set of resources is multiplexed into at least a portion of the first set OFDM symbols based on an identifier associated with the base station.
Patent
Interference control, sinr optimization and signaling enhancements to improve the performance of otdoa measurements
Sandeep H. Krishnamurthy,Robert T. Love,Nimbalker Adzhit,Kenneth A. Stewart,Xiangyang Zhuang +4 more
TL;DR: In this paper, the time-frequency resources associated with a reference signal transmission intended for observed time difference of arrival (OTDOA) measurements from a transmitting base station associated with said one base station identity are determined.
Patent
Locating system and method
Rodney Dr. Bent,Paul W. Casper +1 more
TL;DR: In this article, the authors present a system and a method for locating a source of a randomly modulated radio signal, where at least three receiving stations at known locations receive and process the radio signal.
References
More filters
Patent
Apparatus and method for attenuating interfering signals
TL;DR: In this paper, a method and apparatus for attenuating an interfering signal corrupting a desired Loran C signal is provided, which occurs at the peak of the autocorrelation function of the interfering signal such that the period of the interferer is known.
Patent
LORAN-C navigation apparatus
TL;DR: In this article, a Loran-C navigation receiver is described, where digital circuitry and a microprocessor are used to automatically identify Loran transmitting stations and makes standard hyberbolic navigation measurements.
Patent
Apparatus and method for determining the presence and frequency of a periodic signal
TL;DR: In this article, an apparatus and method for determining the period and frequency of a signal intefering with a desired Loran C signal is provided. But the method is not suitable for the measurement of the interference signal in the presence of an external antenna.
Patent
Apparatus and method for detecting and inhibiting signals interfering with a Loran C signal
Steven C. Jasper,Robert V. Janc +1 more
TL;DR: In this article, an interference rejection apparatus is provided which samples the Loran C signal at selected pulse tracking reference points and separates even and odd groups by appropriate summing-weighting circuitry.
Patent
Method for processing signals in a navigation receiver
TL;DR: In this paper, a method for processing navigation signals received by a LORAN-C receiver to lessen the effects of noise on the navigation data provided to the receiver user is presented.