37 results about "Wideband signal processing" patented technology

The invention discloses a low-altitude target detection broadband radar system based on pitching MIMO and an array optimization method. By combining the frequency phase position comprehensive coding synthetic broadband signal processing technology and the sparse MIMO array signal processing technology, highly efficient and high-precision detection on a low-altitude target can be achieved. The system comprises an antenna branch system, a transceiving assembly branch system, a radio frequency channel branch system, a waveform generation branch system, a frequency synthesizer branch system, a signal processing branch system and a display control terminal branch system. The waveform generation branch system generates six-channel middle-frequency signals through a digital-to-analog conversion DAC playing board card. The middle-frequency signals are in the form of frequency phase position composite coding signals. The six-channel middle-frequency signals enter the frequency synthesizer branch system and pass through the radio frequency channel branch system, the transceiving assembly branch system and ten antenna branch system, so emission wave beams are formed. The transceiving assembly branch system receives echo signals of the target. The echo signals pass through the radio frequency channel branch system, the frequency synthesizer branch system and the signal processing branch system, so an one-dimensional distance image and primary point tracks are obtained.

A positional tracking system used in a virtual reality environment in which multiple users may freely and unrestrictedly explore an environment without affecting position tracking. Receivers mounted to the user in several locations may be accurately tracked regardless of the position of the user and other users in the system. A plurality of transmitters may transmit wide band signals to one or more receivers on a user. Each receiver may receive the wide band signals from the plurality of transmitters, process those signals, and determine a receiver location based on the received signals. The signals themselves may be wide band signals, for example in the range of 3 GHz to 10 GHz. The wide band signals may include identifier information and a pulse for determining a time-of-flight between the transmitter and receiver.

Wireless communication is ubiquitous today with increasing deployments leading to increased interference, increasing conflicts, etc. Monitoring the wireless environment is therefore important for regulators, service providers, Government agencies, enterprises etc. Such monitoring should be flexible both in networks monitored within the wireless environment as well as detecting unauthorized transmitters, allowing dynamic network management, etc. However, such real time spectral/signal analysis in the prior art requires both a wideband direct conversion receiver (DCR), for high performance, wideband, fast, programmable spectral analysis, and a super heterodyne receiver for fast, narrowband, programmable demodulation for signal analysis. According to embodiments of the invention a single receiver design methodology exploiting a single RF circuit to provide superheterodyne and direct conversion receiver functionalities.

An apparatus for electromagnetic processing comprises a modulator for generating one or more elements representative of an input signal; a divider controlled by the one or more elements and receiving an electromagnetic wave to generate a modified signal; a comparator for comparing the modified signal to a reference signal and for generating a processed signal based upon the comparison; and a channel number calculator for selecting a channel for the processed signal, wherein the input signal incorporated the channel selection.

The invention provides a digital down-conversion method of a parallel structure. The method comprises the following steps: carrying out multiphase processing on an input signal, generating a multiphase local oscillator, carrying out multiphase mixing, constructing a preset matrix, designing a prototype low-pass filter, carrying out multiphase processing on coefficients of the prototype low-pass filter, carrying out mixing data precoding, and constructing a parallel filter bank, thereby realizing parallel filtering. According to the method, the problem of low data throughput rate of a serial structure digital down converter is overcome; high-speed sampling signal receiving processing is realized; the requirements of broadband signal processing are met; the frequency of frequency conversionand the cut-off frequency of low-pass filtering can be flexibly set. According to the method, full-bandwidth direct receiving processing of signals is realized, so that a cross-channel problem of a channelized receiver is avoided, merging input of similar items is realized by adding a preset matrix, the number of filters in a parallel structure is greatly reduced, hardware resource consumption isreduced, and FPGA realization is facilitated.

A biquad wideband signal processing circuit can operate over bandwidths of 50 MHz to 20 GHz or more. The biquad circuit employs a configuration of integrators (transconductors), buffers, and scalable summers that can be implemented using deep sub-micron CMOS technology. Combining this scaling with high gain/high bandwidth enables implementation of feedback and programmability for broadband analog signal processing. A biquad circuit implementing a number of parallel integrator lines having adjustable gain provides greater accuracy, stability, and bandwidth, and allows for control of process variations and temperature variation in real-time.

The invention belongs to and relates to a high-frequency broadband underwater acoustic transducer device, in particular to a high-frequency broadband underwater acoustic transducer and a manufacturingmethod thereof. The underwater acoustic transducer comprises a matching layer, a wafer backing layer and an acoustic transmission coating layer which are sequentially installed in the shell in parallel from top to bottom, wherein the wafer is of a 1-3-2 type piezoelectric ceramic composite material structure and comprises a ceramic substrate, a plurality of ceramic elements grow on the ceramic substrate, and every two ceramic elements are connected through a high-molecular polymer; an upper electrode is arranged above the ceramic element; a lower electrode is arranged below the ceramic substrate, a watertight cable or a watertight connector is led out from the lower electrode through the backing layer and the shell, and received or transmitted electric signals are input or output. According to the technical requirements of working frequency and bandwidth characteristics, the wafer and the matching layer are optimally designed, and when the method is applied to underwater speed measurement sonar and detection sonar, broadband signal processing can be carried out to increase the information amount, improve the detection precision, increase the detection range and the like.

Embodiments of the present invention are low cost, robust, broadband, optimum, high precision methods and apparatus of processing pulsed, transient, non-cooperative, non-reproducible, complex, or simultaneous signals based on correlation measurements utilizing optical RF signal train generators. An embodiment of the inventive apparatus comprises: (a) a signal receiving apparatus which receives one or more signals, and outputs the signals; (b) a replica generation apparatus, which comprises one or more RF signal train generators, accepts signals from the receiving apparatus as inputs, and outputs trains of replica pairs, where relative separations between two members in the replica pairs are same or different; and (c) an integration apparatus which performs Doppler, self, or mutual (cross) correlation operations on the replica pairs at RF or optical level. The apparatus of present invention advance interferoceivers of prior art, and overcome deficiencies of radar receivers, channelized receivers, electronic warfare receivers, spectrum analyzers, sampling oscilloscopes, and many others.

The embodiments herein disclose a device and a method for controlling noise in a wideband communication system. In one embodiment herein, multiple microphones for receiving wideband audio signals are provided. A processor is configured to analyze each wideband audio signal received by each microphone. Further, unique signal patterns are generated based on each analyzed wideband signals for each microphone and the unique signal patterns are compared to detect any identical signal patterns. A controller is also provided for controlling gains of those microphones that are detected to be receiving wideband audio signal of identical signal patterns.

The invention discloses a terahertz high-speed communication transmitting mechanism frame and an ultra-wideband signal processing method, the frame comprises a baseband part and a radio frequency part, the baseband part comprises an algorithm-level fully-parallel digital modulation frame, a DAC and a low-pass filter, and the radio frequency part comprises an orthogonal harmonic mixer; the ultra-wideband signal processing method is carried out based on the terahertz high-speed communication transmitting mechanism frame. According to the terahertz high-speed communication transmitting mechanism frame, the speed limit of an FPGA device is broken through, the signal processing speed is greatly improved with few hardware resources under the low device clock frequency, the algorithm hardware implementation problem under the high transmission capacity is solved, the sampling rate requirement of a DAC is lowered, and meanwhile compared with a traditional secondary frequency conversion structure, the transmission efficiency of the terahertz high-speed communication transmitting mechanism frame is greatly improved. According to the invention, the frequency of the signal can be converted to the terahertz frequency band only through one-time frequency conversion, thereby reducing the loss of multiple times of frequency conversion, and improving the transmission quality of the radio-frequency signal.

Methodology to combine Wave Mechanics with Retro-Reflection, to take in the Far Field emitted (incident) Wideband signal via a small array, process the signal and Retro-Reflectively re-transmits the Wideband signal back out, with the Wave Mechanics rotation mechanism injected into the array weights.