47results about How to "Engineering is easy to implement" patented technology

The invention discloses an airship radar conformal thinned array antenna and its signal processing method. The conformal thinned array antenna comprises a plurality of sparsely-distributed subarrays on a ship body. The subarrays adopt active phase control subarrays, and a rigid structure is adopted to guarantee subarray face control precision. A receiving / transmitting assembly of the subarrays is a stereoscopic integrated tile structure with radiation array elements. Each subarray transmits and receives frequency division or code division orthogonal signals so as to realize a full-array transmit-receive function. Observation scope of the conformal thinned array antenna is determined by subarray antenna beamwidth. High spatial resolution is realized by full-array antenna. The airship radar with the conformal thinned array antenna is used for high-resolution ground imaging and moving object detection.

The invention relates to an EIS rapid measuring method of a lithium-ion battery, and provides an EIS rapid measuring method based on square wave current excitation and Fourier transform. The method includes: selecting a square wave excitation frequency based on an electrochemical reaction characteristic of the lithium-ion battery, determining that the lithium-ion battery is in an appropriate polarized voltage amplitude range, and selecting a sinusoidal alternating current amplitude according to the range; applying a square wave current of a selected frequency point and with a specific amplitude to the lithium-ion battery, performing Fourier transform on the square wave current and a response voltage obtained by sampling, and obtaining the impedance of a specific frequency point; and screening the impedance with a specific frequency based on a frequency spectrum amplitude of Fourier decomposition of the response voltage and an impedance change rule to form the electrochemical impedance spectroscopy of the lithium-ion battery, namely EIS. According to the EIS rapid measuring method, the electrode reaction characteristic of the lithium-ion battery can be accurately described, the EIS of the lithium-ion battery is accurately obtained, the EIS test speed of the lithium-ion battery is fast, the test time is short, and the project is easy to realize.

The invention discloses an identification method for lumped thermal parameters of a lithium ion battery. The identification method for the lumped thermal parameters is based on an lumped thermal equivalent circuit and special signal stimulation and by combination with a mathematical algorithm; according to the method, temperature rise of the battery is simulated based on the lumped thermal equivalent circuit; a thermal time constant in the environment is obtained by a temperature change experiment; a functional relation between impedance and temperature is established according to impedance at different temperatures; and by applying sine alternating current with single frequency and amplitude, relatively high accuracy of a battery thermal model is ensured; according to a battery temperature rise model and the functional relation between impedance and temperature, temperature change of the battery under special stimulation is circulated; and an actually-tested battery temperature is approached through a search iterative algorithm, so as to identify specific heat capacity and heat resistance of the battery. According to the method, complex test equipment, such as a heat insulating calorimeter, an isothermal calorimeter and other expensive thermal test equipment are not needed; and in addition, the method has the advantages of simplicity and reliability in identifying thermal parameters of the lithium ion battery, easy realization of engineering and the like.

The invention relates to a bionic polarization sensor multi-source error calibration method based on an adaptive EKF (Extended Kalman Filter). The method comprises the following steps that: (1) on thebasis of installation errors, scaling factors, polarization degree coefficients, polarization azimuthal angles and polarization degrees, establishing a system state model for a polarization navigation system quantity of state; (2) taking a light intensity measurement value which contains a multisource error as an output to establish a system measurement model; (3) designing an adaptive extended Kalman filter to estimate the installation errors, the scaling factors and the polarization azimuthal angles; and (4) according to the estimation values of the installation errors and the scaling factors, compensating a polarization sensor measurement value which contains the multisource error. The method disclosed by the invention has the advantages of being high in robustness and antijamming capability and being easy in engineering implementation.

The invention discloses a horizontal position control method based on a characteristic model. The method comprises the following steps of firstly, based on motion model analysis in a horizontal plane, through generalized inverse processing, acquiring a characteristic model form in which input and output are simultaneously decoupled and giving out a parameter range; and then operating a cycle control process; based on the characteristic model and the parameter range, carrying out on-line identification and acquiring a characteristic parameter estimation value; based on the characteristic parameter estimation value, designing a controller and calculating to acquire a control law; carrying out generalized interference estimation and estimating generalized interferences of two channels in the horizontal plane; carrying out coupling and conservative distribution processing and calculating to acquire an execution mechanism command; carrying out detection, configuration and decoupling processing, and calculating actual control amounts of the two channels. The control method adopts combination of adaptive combination control and generalized interference compensation based on the characteristic parameter estimation value so that simultaneous decoupling of the input and output is realized and maintenance precision of the horizontal position under the condition that a wind field changes randomly is increased.

The invention provides an aircraft simulation air bearing table inertia regulating and measuring device and method. The device comprises a base, an air bearing pair, an experiment table top, two trusses, under-table hanging bins and truss inertia regulating modules; the experiment table top is installed on the air bearing pair, the trusses are installed on the two sides of the experiment table top, the under-table hanging bins are installed under the experiment table top, and the truss inertial regulating modules are installed on the trusses; the trusses are symmetrically installed on the two sides of the experiment table top. The method comprises the steps that rough regulating is performed, a theoretical calculation mode is adopted, inertia predistribution is performed on a computer design model, and balancing weights with the appropriate specification are selected or replaced and installed on the truss inertia regulating modules; when the balancing weights are installed, the balancing weights need to be installed in pairs at discs arranged at the two ends of the trusses; rotary inertia of a system is measured; the calculated rotary inertia is compared with an expected set value, and mass blocks are increased and decreased in pairs at the discs arranged at the two ends of the trusses. The aircraft simulation air bearing table inertia regulating and measuring device and method are suitable for measurement of air bearing table rotary inertia, simple in principle and convenient to install and maintain.

The invention discloses a simplified robust self-adaptive pitching-reduction control method for a multi-hulled ship. A heaving and pitching coupled movement model of the multi-hulled ship is established and converted into a state space form, and the heaving and pitching coupled movement model is decomposed into a heaving movement model and a pitching movement model which are decoupled; according to the heaving movement model and the pitching movement model which are decoupled, expansion state observing devices are separately designed and used for estimating movement states and coupling items of the multi-hulled ship; by combining the steps, the virtual controlling quantity is obtained by integrating the basic controlling quantity of the multi-hulled ship and the estimated coupling items, and the virtual controlling quantity is distributed to attack angles of T-shaped wings and a spray strip. Variation of the heaving height and the pitching angle of the multi-hulled ship is controlled through force and moment generated by the attack angles. The control method is simple, reliable and easy to realize, and can effectively achieve the purposes that heaving of the multi-hulled ship is reduced by 20%-35%, and pitching of the multi-hulled ship is reduced by 40%-50%.

The invention discloses a Doppler radar assisted strapdown inertial navigation motion base alignment method and system. The method comprises the following steps: acquiring a vehicle-carrying longitudinal speed output by a dual-beam Doppler velocity measurement radar; obtaining the speed and course angle output by the strapdown inertial navigation system and the vehicle carrying angular speed output by the gyroscope; according to the vehicle-carrying longitudinal speed and the vehicle-carrying angular speed, performing calculating to obtain the speed and course angle of the vehicle under the navigation coordinate system; respectively subtracting the speed and course angle output by the strapdown inertial navigation system from the calculated speed and course angle of the carrier vehicle toobtain two measurements aligned with the moving base, taking the two measurements as observed quantities, performing state estimation by adopting an adaptive filtering algorithm to obtain an estimatedvalue of the misalignment angle of the mathematical platform, and further obtaining a carrier vehicle attitude correction matrix; and correcting the attitude matrix of the strapdown inertial navigation system to finish alignment of the strapdown inertial navigation motion base. According to the invention, rapid, high-precision and high-autonomy initial alignment of the vehicle-mounted strapdown inertial navigation system can be completed in the vehicle-mounted driving process.

The invention discloses an identification method for lumped thermal parameters of a lithium ion battery. The identification method for the lumped thermal parameters is based on an lumped thermal equivalent circuit and special signal stimulation and by combination with a mathematical algorithm; according to the method, temperature rise of the battery is simulated based on the lumped thermal equivalent circuit; a thermal time constant in the environment is obtained by a temperature change experiment; a functional relation between impedance and temperature is established according to impedance at different temperatures; and by applying sine alternating current with single frequency and amplitude, relatively high accuracy of a battery thermal model is ensured; according to a battery temperature rise model and the functional relation between impedance and temperature, temperature change of the battery under special stimulation is circulated; and an actually-tested battery temperature is approached through a search iterative algorithm, so as to identify specific heat capacity and heat resistance of the battery. According to the method, complex test equipment, such as a heat insulating calorimeter, an isothermal calorimeter and other expensive thermal test equipment are not needed; and in addition, the method has the advantages of simplicity and reliability in identifying thermal parameters of the lithium ion battery, easy realization of engineering and the like.

The invention discloses a horizontal position control method based on a characteristic model. The method comprises the following steps of firstly, based on motion model analysis in a horizontal plane, through generalized inverse processing, acquiring a characteristic model form in which input and output are simultaneously decoupled and giving out a parameter range; and then operating a cycle control process; based on the characteristic model and the parameter range, carrying out on-line identification and acquiring a characteristic parameter estimation value; based on the characteristic parameter estimation value, designing a controller and calculating to acquire a control law; carrying out generalized interference estimation and estimating generalized interferences of two channels in the horizontal plane; carrying out coupling and conservative distribution processing and calculating to acquire an execution mechanism command; carrying out detection, configuration and decoupling processing, and calculating actual control amounts of the two channels. The control method adopts combination of adaptive combination control and generalized interference compensation based on the characteristic parameter estimation value so that simultaneous decoupling of the input and output is realized and maintenance precision of the horizontal position under the condition that a wind field changes randomly is increased.

The invention relates to a method and system for reconfiguring a relay subframe, and belongs to the technical field of wireless communication. The present invention predicts the traffic volume of the eNodeB and the Relay in the next subframe adjustment period according to the change of the eNodeB and the Relay traffic in the previous N subframe adjustment period, and judges whether the traffic of the DeNB and the Relay in the next subframe adjustment period is predicted. It is necessary to add Un subframes or reduce Un subframes, and reconfigure the RN subframes according to the results. When subframes need to be added, the number of subframes selected in the Un subframe configuration method corresponding to the DeNB cell uplink and downlink configuration method is increased. When the subframe configuration method needs to be reduced, the subframe configuration method with the reduced number of subframes is selected from the Un subframe configuration method corresponding to the uplink and downlink configuration method of the DeNB cell, so as to realize the configuration of subframes according to the traffic volume The method is adjusted to avoid the problem of data congestion caused by unreasonable subframe configuration. The invention is simple and easy to implement, easy to implement in engineering, and improves the performance of the relay node.

The invention discloses a simplified robust self-adaptive pitching-reduction control method for a multi-hulled ship. A heaving and pitching coupled movement model of the multi-hulled ship is established and converted into a state space form, and the heaving and pitching coupled movement model is decomposed into a heaving movement model and a pitching movement model which are decoupled; according to the heaving movement model and the pitching movement model which are decoupled, expansion state observing devices are separately designed and used for estimating movement states and coupling items of the multi-hulled ship; by combining the steps, the virtual controlling quantity is obtained by integrating the basic controlling quantity of the multi-hulled ship and the estimated coupling items, and the virtual controlling quantity is distributed to attack angles of T-shaped wings and a spray strip. Variation of the heaving height and the pitching angle of the multi-hulled ship is controlled through force and moment generated by the attack angles. The control method is simple, reliable and easy to realize, and can effectively achieve the purposes that heaving of the multi-hulled ship is reduced by 20%-35%, and pitching of the multi-hulled ship is reduced by 40%-50%.

The invention discloses an airship radar conformal thinned array antenna and its signal processing method. The conformal thinned array antenna comprises a plurality of sparsely-distributed subarrays on a ship body. The subarrays adopt active phase control subarrays, and a rigid structure is adopted to guarantee subarray face control precision. A receiving / transmitting assembly of the subarrays is a stereoscopic integrated tile structure with radiation array elements. Each subarray transmits and receives frequency division or code division orthogonal signals so as to realize a full-array transmit-receive function. Observation scope of the conformal thinned array antenna is determined by subarray antenna beamwidth. High spatial resolution is realized by full-array antenna. The airship radar with the conformal thinned array antenna is used for high-resolution ground imaging and moving object detection.