4 results about "Radial velocity" patented technology

The invention discloses a broadband FP (Fabry-Perot) cavity transmission spectral line calibration method and a calibration spectral line generation device, and belongs to the field of astronomical spectrum calibration. According to the invention, the laser frequency comb is utilized to carry out precise calibration on the FP cavity, the precision is an Hz magnitude, and the calibration precision of the radial velocity of the FP cavity can reach m / s; by tuning laser frequency comb parameters, all transmission peaks are supplemented, and broadband coverage is achieved; the high precision requirement for FP cavity coating is avoided, the accuracy of transmission spectral lines is ensured, frequent calibration is performed on the FP cavity, and the problem that the FP cavity cannot provide long-term stability of frequency is solved; a low-repetition-frequency picosecond white light source is used, the spectrum is wide and flat, the spectrum is not sensitive to the position of a transmission peak of an FP cavity, and the light enters a calibrated FP cavity array to generate a calibration spectral line with a high signal-to-noise ratio and multiple frequency intervals, so that the calibration precision of the astronomical spectrometer reaches the cm / s-level radial velocity calibration precision. The method is applied to the calibration of the astronomical spectrometer for extrasolar planet search.

The application provides a weather radar spiral scanning mode radial velocity motion compensation and deblurring method, and relates to the technical field of weather radar signal processing, and the method comprises the following steps: calculating a line-of-sight unit vector and predicting a platform radial projection based on an attitude and scanning geometry; establishing a folding observation relationship according to the Nyquist velocity, constructing a finite candidate folding integer set by using the platform prediction projection, determining the folding integer in the candidate set by matching the consistency constraint, realizing the velocity blurring correction; applying the meteorological small velocity physical prior and the spatial continuity constraint to the blurring correction result to suppress the false correction; and adopting the sequence of deblurring first and then deducting the platform projection to obtain the compensated radial velocity. The application reduces the velocity folding jump under the spiral scanning condition, reduces the systematic deviation related to the scanning phase, improves the radial velocity consistency, and provides reliable input for the cloud and rain radial velocity product and subsequent cloud wind field inversion.

The application provides a method and system for detecting radial velocity of a flow field, and the system for detecting radial velocity of a flow field is used to generate a common Gaussian light beam and a high-order vortex light beam with a non-zero radial coefficient; the high-order vortex light beam is used to irradiate a measured fluid and pass through the measured fluid to generate target detection light carrying radial information of the fluid, and the common Gaussian light is interfered with the target detection light to generate a heterodyne interference signal; a detector is used to detect the heterodyne interference signal and analyze a Doppler spectrum; and the radial velocity of the measured fluid is determined according to the Doppler spectrum. When the detection light irradiates the measured fluid, fluid particles in the measured fluid move radially in a light spot of a high-order vortex light beam orthographic projection, the application uses the high-order vortex light with an intensity distribution in the radial direction to detect the flow field to generate a Doppler effect, so that the radial velocity of the flow field is detected, and therefore the application has a wide application scenario.

This disclosure provides a calibration method for a laser wind-measuring radar based on weather radar, comprising: controlling a laser wind-measuring radar and a weather radar to perform synchronous observations under clear sky conditions; wherein the observation path of the laser wind-measuring radar is located within the clear sky echo observation area of ​​the weather radar; acquiring radial velocity data derived from the clear sky echo observed by the weather radar and wind measurement data observed by the laser wind-measuring radar; converting the wind measurement data into simulated radial velocity data, wherein the simulated radial velocity data is the radial velocity data of the observation point of the laser wind-measuring radar relative to the weather radar; calculating calibration parameters based on the radial velocity data and the simulated radial velocity data; and calibrating the wind measurement data observed by the laser wind-measuring radar according to the calibration parameters. In this way, in-situ automated calibration of a laser wind-measuring radar based on weather radar can be achieved.