115 results about "Distributed filtering" patented technology

The invention belongs to the technical field of distributed filtering and target tracking, and particularly relates to a distributed target tracking method based on improved joint probability data association. The method provided by the invention comprises the steps that (1) a motion model is established for each target of a sensor multi-target tracking system; (2) a data association filtering method is carried out on each sensor to acquire the state estimation of the target within a detection range related to each sensor; and (3) spatial association is carried out on the state estimation of each sensor, and then the state estimation of the same target is fused to acquire the final target state estimation value. The simulation result proves the performance of the algorithm. The method can achieve the same precision as a traditional joint improved version data association method, and is superior to a joint probability data association method in time performance. The time of the algorithm is reduced.

A network device coordinates with other devices in a network to create a distributed filtering system. The device detects an attack in the network, such as a distributed denial of service attack, and forwards attack information to the other devices. The devices may categorize data into one or more groups and rate limit the amount of data being forwarded based on rate limits for the particular categories. The rate limits may also be updated based on the network conditions. The rate limits may further be used to guarantee bandwidth for certain categories of data.

An L-band optical amplifier has a rare earth doped gain medium including a filter distributed over a finite physical portion of the gain medium. The filter is distributed over between about 25% to substantially the entire length of the gain medium. The distributed filter substantially eliminates out-of-band light emission (C-band ASE, 1520 nm-1565 nm) and thus improves the performance of L-band amplification (1565 nm-1620 nm). Examples of distributed filters include discrete type filters such as long period gratings, or continuous type filters such as rare earth doped, twin core fibers, non-adiabatically tapered fibers and coaxial resonant ring fibers.

Discussed herein are a sensor-network system and a method thereof for detecting and isolating faults occurring in sub-systems and sensors included in the network. The sub-systems and the sensor measurements are subject to noise and disturbances. A bank of Kalman-filters (KF) is used to detect and isolate the faults. Each KF is driven by either a pair of consecutive sensor measurements or a pair including a reference input and a sensor measurement. The KF residual is computed for each measurement pair and is a reliable indicator of a fault in subsystems and sensors located in the network.

In a stacked waveguide assembly, the waveguides can comprise color filters, distributed filters, and / or switch materials. Examples of color filters include dyes, tints, or stains. Examples of distributed filters and / or switch materials include dichroic filters, Bragg gratings, electronically switchable glass, and electronically switchable mirrors. Switch materials can be designed or tuned to attenuate light of unwanted colors or wavelengths. The waveguides may each be associated with a particular design wavelength. This can mean that a waveguide that is associated with a design wavelength includes an incoupling optical element is configured to deflect light at the design wavelength to an associated light distributing element and that the associated wavelength selective region is configuredto attenuate light not at the design wavelength.

A multispectral sensor is provided with an illumination source and a digital imaging system. The illumination source is disposed to provide light at multiple wavelengths to an object. The digital imaging system is disposed to receive light scattered from the object and has a digital array of light detectors and a color filter array. The color filter array has a multiple distributed filter elements, each of which is adapted to transmit light of one of a limited number of specified narrowband wavelength ranges. The color filter array is disposed to filter the light scattered from the object prior to encountering the digital array of light detectors.

The invention relates to a distributed filtering network system and a design method. The system comprises the following parts: a filter network unit comprising filters distributed at different physical sites; a sensor sampling unit comprising vehicle-mounted sensors and filtering sensors, wherein the vehicle-mounted sensors are embedded in an automobile suspension system and acquire state information of the automobile suspension system, and the filtering sensors are embedded into the filters and acquire exchange information between the filters and set adjacent filters; and an event trigger unit comprising event triggers corresponding to the filters, wherein each event trigger determines event occurrence time of a corresponding filter, at the event occurrence time, the filters receive the automobile suspension system state information acquired by the corresponding vehicle-mounted sensors and the exchange information of the set adjacent filters, and otherwise, the filters do not act. Compared to the prior art, the system provided by the invention can satisfy the demand of multiple terminals for simultaneously obtaining data, can also effectively prevent filter network collapse, and is low in energy consumption, high in efficiency and high in stability.

Discussed herein are a sensor-network system and a method thereof for detecting and isolating faults occurring in sub-systems and sensors included in the network. The sub-systems and the sensor measurements are subject to noise and disturbances. A bank of Kalman-filters (KF) is used to detect and isolate the faults. Each KF is driven by either a pair of consecutive sensor measurements or a pair including a reference input and a sensor measurement. The KF residual is computed for each measurement pair and is a reliable indicator of a fault in subsystems and sensors located in the network.

The invention discloses a distributed filtering device for a MIMU and GPS combined navigation system, which comprises 5 difference comparison units and 5 filters. The difference comparison units and the filters respectively filter the course and speed information as measurement input and outputted by the MIMU and GPS, and transmit the information after filtering back to the MIMU for rectification; finally, the rectified speed, attitude and position information is used as the final output of the MIMU / GPS combined navigation system. The filtering device can reduce the calculated quantity of the system, has high error tolerance capacity, also compensates through real-time gyrodrift estimation, and accordingly improves the accuracy of the output information of the MIMU / GPS combined navigation system.