30results about How to "Avoid emulation" patented technology

The invention discloses a performance analysis method of a UAV relay system based on spatial modulation. Aiming at the UAV relay system based on spatial modulation, a system is established in which the system experiences the Rice channel under the condition of no direct link. model; according to the definition of the joint bound, the system bit error rate is divided into three different error cases, and according to the probability density function and cumulative distribution function of the channel information, the calculation method of the system bit error rate joint bound is given, and further The calculation method of the approximate bit error rate joint bound of the system under high signal-to-noise ratio is given; the diversity degree of the system is given according to the approximate bit error rate joint bound of the system under high signal-to-noise ratio; The proposed performance analysis method can effectively evaluate the bit error rate performance of the system.

The invention discloses a unit quick selection method of an opportunity array antenna and solves the problem that existing opportunity array antenna units are difficult to be selected quickly. The unit quick selection method includes: setting parameters; determining beam width: determining half-power beam width through unit simulation; randomly selecting an antenna unit, and setting an initial value; performing outside-unit normal vector solving to serve as an antenna radiation direction; calculating an included angle between the maximum radiation direction and a beam pointing direction, wherein the included angle is taken as a selection basis; judging whether to select for comparison or not, and calculating the included angle within a range being half of the half-power beam width to meetrequirements of the selection antenna unit; judging whether search is completed or not: detecting whether all antenna units are already searched or not; completing antenna unit selection to quickly acquire a proper antenna unit. A radiation unit is accurately and quickly selected under a given scanning angle by combining with an antenna unit radiation direction diagram, efficient and effective unit selection is realized, and the unit quick selection method is used for the field of radar and detection by utilizing antennas.

The invention relates to the technical field of three-pin automatic impedance matching, in particular to a fast three-pin automatic impedance matching system. The fast three-pin automatic impedance matching system includes the following steps: 1) establishing a three-pin waveguide equivalent circuit; 2) establishing a circuit parameter relationship; 3) designing a matching algorithm. The invention directly establishes the mathematical relationship among the reflection coefficient, load impedance, pin depth and S parameter of the three-pin waveguide, and can quickly calculate the scattering parameter and load impedance according to the reflection coefficient and the pin depth, thereby realizing fast impedance matching calculation. Based on the equivalent circuit method and numerical calculation, the invention can greatly reduce the amount of computation, simplify the design process of automatic impedance matching, does not require a database, and can be widely used in pin waveguides of different sizes.