Patent
FFT-based filtering for low-quality signal direction finding
Reads0
Chats0
TLDR
A radio direction finding system for low signal quality transmission signal performs a Fast Fourier Transform (FFT) on an entire received RF band into a number of FFT bins, each serving as an IF filter.Abstract:
A radio direction finding system for a low signal quality transmission signal performs a Fast Fourier Transform (FFT) on an entire received RF band into a number of FFT bins, each serving as an IF filter. The contents of each FFT bin are demodulated to decode a frequency signature from the encoded RF signal. A signal-to-noise ratio comparator receives the FFT baseband samples and determines the signal level from the known frequency signature. The FFT baseband buffer with the greatest SNR corresponding to a particular FFT frequency bin is outputted as a direction finding metric.read more
Citations
More filters
Patent
Layered modulation for digital signals
TL;DR: In this paper, the authors present a layered signal for transmitting data, which comprises a first signal layer including a first carrier and first signal symbols for a first digital signal transmission and a second signal layer comprising a second carrier and second signal symbols to produce the second signal symbol.
Patent
Resolution algorithms for multi-radio coexistence
Ashok Mantravadi,Tamer Kadous +1 more
TL;DR: In this article, various algorithms for joint power resolution for multi-radio wireless devices are described. But, the authors focus on the performance enhancements over conventional piecewise radio resolution schemes.
Patent
Short range RF monitoring system
Mark Elsom-Cook,Steve Morris +1 more
TL;DR: In this article, a wireless short range radio-frequency master device is adapted to create and maintain a portable private network of WRSR slave devices, where the master device detects and registers suitable slave devices for a network, and is capable of determining the proximity of any registered slave device with respect to the master devices in use.
Patent
Mapping radio-frequency spectrum in a communication system
Steve Moore,John Santhoff +1 more
TL;DR: In this article, a communication method for analyzing or mapping portions of the radio frequency spectrum is provided, with a first step of the method including receiving an electromagnetic energy from a portion of a radio frequency frequency spectrum.
Patent
Method of, and apparatus for, determining position
TL;DR: In this paper, the Fourier transform of a power spectrum density of the received signal is determined and a check is made to see if a line-of-sight (LOS) signal is present.
References
More filters
Patent
Direction finding localization system
John E. Maloney,Charles N. Katz +1 more
TL;DR: In this article, the relative insensitivity of the phase angle differences of a radio signal to the signal distortions inherent in an urban environment with digital signal processing techniques was combined to produce an accurate and economical way to locate a mobile transmitter station such as a mobile telephone in a cellular network.
Patent
Multi-mode, multi-band, multi-user radio system architecture
TL;DR: In this paper, a multi-mode, multi-band and multi-user radio system architecture is presented. But the architecture is not suitable for the use of a single-input single-output (SIMO) channel.
Patent
Arrangement for and method of concurrent quadrature downconversion input sampling of a bandpass signal
TL;DR: In this paper, the first and second clock rates are at four times the expected center frequency of the bandpass signal, and the second clocking rate is at an exact subharmonic frequency of bandpass frequency.
Patent
Partial intercept LPI (low probability of intercept) reconnaissance system
TL;DR: In this paper, the authors present an apparatus and method for separately tracking, identifying and providing DF on LPI RF transmitters, which includes an antenna and a single channel receiver.
Patent
Method and measurement configuration for measuring the characteristics of radio channels
TL;DR: In this article, a method for measuring characteristics of radio channels is proposed, in which the signals are received by a total of M 1 receiving sensors in a linear antenna array, and the respective received signals are composed of wave elements of a transmitted signal with a different incidence direction and different delay.