Time filter

Source Type

The present disclosure provides a method for improving capability of resisting image noise of a co-phasing system of a dispersed fringe sensor. The method comprises the following steps: carrying out a coarse co-phasing adjustment by utilizing the dispersed fringe sensor until the coarse co-phasing is stabilized in a closed loop; collecting a two dimensional dispersed fringe image by the dispersed fringe sensor; superposing the dispersed fringe image along a dispersed direction so as to convert the two dimensional dispersed fringe image to a one dimensional image along an interferential direction; extracting peak values of the main peak, a left side lobe and a right side lobe of the one dimensional image along the interferential direction, and calculating corresponding piston error value of the image by carrying out a Left-subtracting-right LSR algorithm on these peak values.


Patent
CAS Institute of Electronics | Date: 2017-03-29

Disclosed is a real-time elevation DBF processing method, which includes: weighting and summing processing is performed on an intermediate frequency signal obtained from sampling made on each channel to obtain two channels of combined intermediate frequency signals; frequency mixing-based orthogonal demodulation is performed on signals in real number field of the two channels of combined intermediate frequency signals respectively; and cross summation is performed on two channels of demodulated intermediate frequency signals and resulting signals are low-pass filtered. Further disclosed is a real-time elevation DBF processing device.


Patent
CAS Institute of Electronics | Date: 2017-03-22

A method and device for generating a NLFM signal are provided, and the method includes: a power spectral density is determined according to a required PSLR; a frequency-time structures function of the signal is determined according to the power spectral density; a time-frequency structures function of the signal is determined according to the frequency-time structures function of the signal; the time-frequency structures function of the signal are integrated to obtain a phase, and discrete values of the signal using the obtained phase are calculated; and the series of digital signals are generated according to the discrete values of the signal, and digital-to-analog conversion is performed on the series of digital signals to obtain the NLFM signal.


A method and device for SAR imaging based on a NLFM signal are provided, and the method includes: performing range pulse compression on echo data according to a transmitted NLFM signal; compensating, according to a determined slant range error, the data subjected to the range pulse compression for a motion error at a reference distance to obtain compensated data; performing modified Stolt mapping on the compensated data; and compensating the data subjected to the modified Stolt mapping for a residual motion error and performing azimuth focusing on the data subjected to the compensation of the residual motion error so as to complete imaging of an NLFM signal.


Patent
CAS Institute of Electronics | Date: 2016-01-15

The present disclosure provides a high accuracy measurement system for focusing and leveling. The system determines an off-focus distance in the perpendicular direction within the exposure field and an inclination in the horizontal direction by measuring heights of four detection points on a substrate by using a four-channel detection method, thereby achieving focusing and leveling of the substrate. The detection of the substrate heights is implemented by a focusing method based on dual-channel light intensity modulation. Two superposed grating fringes are formed with phase difference of /2. The shift can be resolved by the phase variation of corresponding fringes. According to the method, the off-focus distance can be derived. The present disclosure effectively eliminates the error due to the intensity changes caused by the fluctuations of the source or the reflectance of the substrate surface. The apparatus for focusing and leveling is easy to be implemented and has an accuracy of nanoscale.


Patent
Shenzhen Mindray Bio Medical Electronics Co. and CAS Institute of Electronics | Date: 2016-10-17

The present disclosure provides a flow cytometer and a multidimensional data automatic classification method and apparatus thereof. An auxiliary parameters and a main parameter are selected for a target cell population of each detection item. A statistical analysis is first performed on particle characteristic data of cells according to the auxiliary parameters to obtain a cell population of interest. Another statistical analysis is then performed on the particle characteristic data according to the main parameter. Afterwards, the cell population of interest is mapped to a statistical result obtained in the statistical analysis performed according to the main parameter; and finally, the target cell population is obtained according to a distribution position and an edge of the-cell population of interest as well as a gating on the main parameter.


Patent
CAS Institute of Electronics | Date: 2015-12-16

An adaptive optical objective inspection instrument for optic nerve function comprises: a sub-system for measuring wave aberration of humans eyes, including a near infrared beacon light source, an intermediate optical system, a wavefront corrector and a wavefront sensor, configured to measure and obtain wave aberration of testees eyes, the intermediate optical system arranged along an optical path between the near infrared beacon light source and the wavefront sensor, and the wavefront corrector arranged in the optical path of the intermediate optical system; a sub-system for correcting wave aberration of humans eyes, including the intermediate optical system, the wavefront corrector and a control unit, the control unit configured to drive and control the wavefront corrector to correct the wave aberration of testees eyes according to the measured wave aberration; and a sub-system for inspecting optic nerve function, including a visual stimulus display and a system for collecting visual evoked potential signal.


Patent
Shenzhen Mindray Bio Medical Electronics Co. and CAS Institute of Electronics | Date: 2016-10-10

This disclosure provides automatic compensation methods, corresponding devices and a corresponding flow cytometer. The automatic compensation method includes: determining a base cell population and a reference cell population in the cell populations according to positions of the cell populations in a dot plot that needs to be compensated, where the base cell population is a double negative cell population and the reference cell population is a single positive cell population adjacent to the base cell population in a compensating direction (S10); calculating automatically a compensation value through a progressive approximation algorithm according to a position of the base cell population, and updating the dot plot with the compensation value, so that the position difference between the reference cell population and the base cell population both in the dot plot in the compensating direction is within a predetermined range (S16).


Patent
CAS Institute of Electronics | Date: 2016-03-02

Provided are a method and device for assessing damage in a disaster area, which can assess damage in the disaster area using a single post-event Very High Resolution (VHR) SAR image of the disaster area, and the method includes: a captured post-event Very High Resolution (VHR) Synthetic Aperture Radar (SAR) image of the disaster area is divided into at least one sub-image region; a Gray Level Co-occurrence Matrix (GLCM) corresponding to an ith sub-image region is acquired, and at least one texture feature value of the ith sub-image region is acquired according to the GLCM; texture feature value levels corresponding to respective texture feature values of the ith sub-image region are determined according to a preset ranking strategy; and a damage level of the ith sub-image region is acquired according to the texture feature value levels corresponding to respective texture feature values of the ith sub-image region and preset weights of respective texture feature values.


Patent
CAS Institute of Electronics | Date: 2016-04-27

Disclosed are a method and device for implementing Synthetic Aperture Radar (SAR) imaging, and the method include: an SAR signal is modulated and demodulated to obtain a demodulated echo signal; the demodulated echo signal is filtered to obtain a filtered echo signal; and imaging processing is performed on the filtered echo signal to obtain an imaging result.

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