2results about How to "Improve focus quality" patented technology

This utility model discloses a calibration device for calibrating a sensor beam, comprising a base and a support. The base has a slide rail, on which a first sliding plate is slidably connected. An analysis device is mounted on the first sliding plate. The base also includes a mold, a fine-tuning mechanism, and a limiting mechanism. A lens is mounted on the mold. A docking plate is slidably connected to the fine-tuning mechanism, and a circuit board is mounted on the docking plate. An interface is electrically connected to the circuit board. The fine-tuning mechanism has a fine-tuning component that drives the docking plate to slide. A transmitter is slidably connected to the support, facing the lens and the analysis device. A locking component is detachably connected to the support to hold the transmitter in place. The support is mounted on the mold, and the limiting mechanism contacts the support, constraining it to the mold. This utility model provides a calibration device for calibrating a sensor beam, reducing the difficulty for operators in adjusting the distance between the transmitter and the lens.

The invention discloses an ISAR (Inverse Synthetic Aperture Radar) range envelope alignment method and system based on phase difference, and belongs to the technical field of radars. The method comprises the following steps: sampling echo signals after pulse compression one by one, estimating and compensating adjacent sampling average phase change; partitioning azimuth signals in a distance frequency domain, respectively adding rectangular windows by taking zero frequency as a boundary, and sampling in each azimuth to generate an upper sideband signal and a lower sideband signal; performing three-time conjugate multiplication on four adjacent sampled signals to obtain a differential signal; obtaining an adjacent offset through maximum likelihood estimation by using the differential signal; aligning the adjacent envelopes according to an estimation result; and after the aligned envelopes are accumulated, the steps are repeated for recursion with the next sample, and finally, envelope alignment of all the samples is completed. According to the method, the sub-pixel-level distance envelope alignment precision can be realized without up-sampling and interpolation operations, and the problem of echo generation caused by amplitude modulation in a traditional amplitude dependent algorithm is effectively avoided.