5results about How to "Shorten capture time" patented technology

The invention provides a variable light beam detection center scanning device which comprises a first plane mirror, a second plane mirror and a convex lens, incident light is reflected to the convex lens through the first plane mirror and the second plane mirror in sequence and enters a scanning mechanism after being refracted by the convex lens, and the first plane mirror and the second plane mirror are translated through a moving mechanism. The central position of a scanning view field can be continuously changed in real time and the scanning center can be actively adjusted to the target direction only by controlling the translation of the two movable plane mirrors at the front end under the conditions of not changing the posture of an equipment main body and fixing the direction of incident light, so that the probability of missing scanning at the edge is reduced, the capturing time is shortened, and the capturing efficiency is improved.

The invention discloses a miniaturized intelligent cooperative control airborne laser communication terminal, and the terminal comprises a coarse aiming unit which comprises a universal rotary table and is used for achieving the large-angle range coarse positioning and posture adjustment of the laser communication terminal, and providing a basic positioning reference for the subsequent fine aiming adjustment; the fine sighting unit is driven by piezoelectricity-electromagnetism in a hybrid mode, is matched with the coarse sighting unit, obtains positioning information of the coarse sighting unit and is used for achieving small-angle high-precision correction and compensating for positioning errors of the coarse sighting unit; the intelligent control unit is respectively connected with the coarse aiming unit and the fine aiming unit, and is used for receiving an external control instruction and scanning information fed back by the coarse aiming unit and the fine aiming unit, and generating and outputting a corresponding driving control signal; the invention further discloses an application method of the airborne laser communication terminal. The direct-driven coarse aiming unit is adopted to improve the coarse aiming efficiency, the fine aiming performance is considered through piezoelectric-electromagnetic hybrid driving, platform vibration from low frequency to high frequency can be comprehensively compensated, and the tracking precision and the link stability are improved.

The utility model belongs to the technical field of phase-locked loop capture, disclose a kind of phase-locked loop capture device, including temperature compensation crystal oscillator, frequency discriminator phase detector, loop filter, adder, voltage-controlled oscillator, power divider, phase detector, operational amplifier, amplifier and frequency divider;Temperature compensation crystal oscillator is connected with frequency discriminator phase detector, frequency discriminator phase detector is connected with adder by loop filter, adder is connected with voltage-controlled oscillator, voltage-controlled oscillator is connected with delay line by power divider, and one road is connected with phase detector;Wherein, phase detector is connected with adder by operational amplifier.The utility model initial locking voltage adopts phase discrimination conversion mode, with fast conversion speed, pre-set voltage precision higher advantage.Shorten the time of phase-locked loop capture while not influence phase noise and other indexes, and simplify circuit structure and space layout, so that application is more simple and convenient, cost is also reduced.In circuit design and structure form, it is more flexible, easy to expand.

The invention provides a synchronization method and system for power line carrier communication and electronic equipment, and the method comprises the steps: obtaining signal data of a sender in power line carrier communication, and processing the signal data to obtain a plurality of data frames; inserting a leader sequence at an initial position in a data frame to generate a marked data frame; acquiring a local sequence of a sender, and performing convolution calculation on the marked data frame and the local sequence to obtain a convolution value; judging whether the convolution value exceeds a preset threshold value or not, and if yes, determining the position exceeding the threshold value as a peak value position; intercepting a marked data segment according to the peak value position, and performing autocorrelation calculation on the marked data segment to determine the initial position of the data frame; and enabling the receiver to receive the data frames from the starting position of each data frame. The problem of insufficient high-precision synchronization rate in power line carrier communication is solved.