30results about How to "High dynamic range)" patented technology

Provided are a dimming method and a dimming device capable of automatically dimming even a subject with a high reflectance. In the dimming device that controls the amount of light to be illuminated so that the brightness level of the image becomes a predetermined value, the shape of the opening of the slit is used: at the maximum position of the slit, the center of the portion of the opening that passes through the slit in the light-emitting portion of the lamp On the axis of the lamp; at the minimum position of the gap, the center of the part of the light-emitting part of the lamp passing through the opening of the gap is on the periphery of the lamp (peripheral part of the light-emitting part of the lamp); In the device for adjusting the amount of light on the body, the amount of light passing through the slit changes exponentially according to the movement of the slit.

The invention discloses a synchronization method suitable for a high dynamic environment of a frequency hopping anti-interference system, which relates to a high dynamic synchronization technology in the frequency hopping anti-interference system. Based on the limited synchronous sequence in the frequency hopping frame structure, the present invention estimates and corrects the Doppler code deviation by using the cycle difference statistics method, and eliminates the clock deviation caused by the Doppler code deviation. Carrier synchronization adopts segmented matched filtering, FFT frequency offset estimation based on segmented accumulation, etc., to realize large frequency offset search, frequency dynamic compensation and tracking. During the synchronization process, the estimation and correction of code offset and frequency offset cooperate with each other and are based on each other, making the synchronization performance of airborne and other high dynamic platforms stable and reliable. It is especially suitable for improving the anti-Doppler ability of the satellite frequency hopping communication system.

The invention discloses a multi-channel high repetition frequency large dynamic range ranging and speed measuring laser radar method and device. The beam generated by the laser light source is divided into output beams of N channels through a beam splitter, and the output beams of each channel are subjected to broadband linear frequency modulation, and then After phase shifting with different amplitudes, the phase modulator is driven, so that the output beams of each channel have different time delays; and then divided into local oscillator beams and emission beams by a beam splitter; N emission beams are transmitted to the target in parallel and receive the target The echo beam is then coherently mixed with the corresponding local oscillator beam to obtain an intermediate frequency signal containing target distance and speed information, and parallel fast Fourier transform and cross-spectrum processing are performed on the sampling data of the intermediate frequency signal to achieve target distance and speed. Parallel synchronous measurement of speed, and finally the combined output of N channel point cloud images is realized by the main control computer. The invention can effectively overcome the fuzziness of distance measurement, and has the advantages of high repetition frequency, large dynamic range of distance measurement, high resolution, high precision, high reliability, small size and light weight.