39results about How to "Short capture time" patented technology

Methods, apparatus and compositions for separating a desired or undesired population or subpopulation from a biological sample are disclosed herein. The selection procedure is based on ferromagnetic, dense particles in a preferred size range from about 0.8 to about 1.2 microns. Specific binding agents are bound to the particles that recognize and bind to specific molecules on the targeted population or subpopulation, and the particles are mixed with the sample in such a way as to promote movement of the particles relative to the sample, promoting binding to the targeted population or subpopulation without non-specifically binding to non-targeted populations in the sample. Because of the large particle density, the bound population is separated from the fluid sample by gravity. Alternatively, the sample, including the bound, targeted population, is placed in a magnetic field such that the particles separate from the sample by evenly distributing over the vessel wall thus limiting non-specific trapping of the non-targeted population.

Coated Ferromagnetic Density Particles or Density Particles with binding agents bound thereto capable of binding biological molecules and methods of use and apparatus for means are disclosed. Coated particles coupled to specific binding agents can be used for molecular biology and proteomic applications in research and diagnostics.

A three-finger non-cooperative target capturing mechanism and its capturing method relate to the technical field of space robots. The present invention provides a three-finger non-cooperative target capturing mechanism to solve the disadvantages of large volume and heavy mass of the existing capturing mechanism. The driving device of the present invention is arranged in the supporting wall, the top end of the ball screw shaft is hinged on the upper cover plate and is rotatable, and the bottom end is connected to the driving device; the screw nut is sleeved on the ball screw shaft And it is combined with the ball screw shaft to form a screw pair; the adapter is tightly sleeved on the screw nut and hinged with the bottom end of the capture finger through a hinge; the capture end of the capture finger passes through the expansion and contraction formed by the upper cover plate and the support wall The hole protrudes from the support wall and is located at the upper end of the upper cover plate; the rotation of the ball screw shaft drives the screw nut to move up and down linearly, thereby driving the capture finger to expand and contract relative to the support wall. The invention is used for the capture of non-cooperative targets.

The invention discloses a high-efficiency multi-mode self-adaptive capture and tracking method for a satellite receiver. The antenna at the receiving end receives a signal, down-converts the signal, enters the baseband part, and then executes the following steps: S1, capture, in the The steps include coarse capture S11 and fine capture S12 steps; S2, tracking of carriers, codes and data; the present invention has strong compatibility, and the same capture and tracking system is applicable to multiple communication systems, and can seamlessly coexist between multiple communication mechanisms. Slot switching, better real-time communication; and smaller size, weight, and volume, suitable for miniaturized and lightweight spaceborne applications, with short capture time, high tracking efficiency, and small frequency tracking error.

The invention belongs to the technical field of ultra short wave communication systems, and particularly relates to a high data rate burst communication fast acquisition method and a device based on a spread-spectrum technology. The method comprises steps: accumulation down sampling is carried out on base band data with twice the spread-spectrum code rate as accumulation zero clearing signals; down sampling base band signals and spread-spectrum codes sampled at the twice spread-spectrum code rate are subjected to vector storage, the down sampling base band data slide at the twice spread-spectrum code rate respectively, the phase of the local spread-spectrum codes is fixed and the local spread-spectrum codes do not slide, under the same clock action, the two are grouped for XOR accumulation, an incoherent peak of a half chip is solved and compared until the incoherent peaks of all half chips are compared and the maximum value, the second maximum value, the third maximum value and the code phase are latched, the average value of the incoherent peaks of all code phases is solved, and whether signals are acquired successfully is judged. Thus, acquisition on high data rate ultra short wave burst communication based on the spread-spectrum technology can be quickly realized, and the hardware realization complexity is low.

The invention provides a method for improving the incoherent detection performance of MSK (minimum shift keying) signals, and aims at providing the method solving the problem of MSK signal application limitation caused by poorer incoherent detection performance and realization difficulty of coherent detection of the MSK signals. The method provided by the invention is realized through the following technical scheme that in an MSK data transmission receiving machine, a signal capture module stores baseband signals after the down-conversion into a memory, then, a high-speed clock is used for reading out the stored signals from the memory, next, the read signals are subjected to frequency offset compensation and bit synchronization searching according to the pre-divided frequency grooves, and the searching results are sent to a signal tracking module; the signal tracking module realizes the frequency and bit synchronization tracking through a frame head waveform matching correlator according to the capture results sent from the signal capture module; and a correlation judging module carries out correlation calculation on the signals sent by the signal tracking module with the local waveforms, selects the maximum correlation value from the correlation results and adopts the bit of the maximum correlation value corresponding to the middlemost part of the bit flow as the final judgment results to be output.

The invention discloses a vehicle-mounted satellite communication sky servo and front-end system, which comprises an antenna system, a servo system and a communication front-end system, wherein, the antenna system comprises an antenna array (1), an antenna mounting reflecting plate (2), an electric bridge (3) and a power divider (4); the servo system comprises an orientation transmission mechanism, a pitching transmission mechanism, a servo controller and a navigation system; the communication front-end system comprises a power amplifier, a low-noise amplifier, a filter and a frequency converter; and the communication front-end system is connected with the communications terminal through a slip ring. The vehicle-mounted satellite communication sky servo and front-end system provided by the invention has the advantages of short catching time, high tracking and response speed, high tracking accuracy, independent tracking and communication, convenience in use, simple structure, good stability and low system cost, and dispenses with catching again in case of false tracking; and the eight-unit forming array antenna is adopted, so the antenna field gain is greatly improved and the communication quality is improved too.

The invention discloses a broadband DS / FH (Direct Spreading) / FH (Frequency Hopping) signal parameter estimation method and system based on Keystone transform, and aims to provide a high-precision andlow-complexity broadband DS / FH signal parameter fast estimation method. The technical scheme is as follows: using a differential correlation-based DS / FH signal estimation method to obtain a delay time estimation value of a received signal, dispreading the received signal to obtain a dispreading signal by referring to the delay time estimation value; judging the frequency hopping and a symbol turnover position of the received signal according to the delay time estimation value, performing segmented processing on the dispreading signal, and forming a segmented signal matrix by segmented signals; respectively performing Keystone transform on each row of the segmented signal matrix, and respectively carrying out Fourier transform on each row of the signal matrix after the Keystone transform to obtain a frequency domain matrix, taking module square for the frequency domain, and performing non-coherent accumulation according to columns to obtain accumulated vectors; and finding the frequency fm corresponding to a maximum value from the accumulated vectors, and carrying out speed estimation and completing parameter estimation.