33results about How to "Slow time lag" patented technology

The invention provides an in-orbit high-precision real-time positioning method based on optical images. The in-orbit high-precision real-time positioning method comprises the steps that: relevant parameters in a strict geometric imaging model are classified and equalized, and the strict geometric imaging model is equivalent to an on-satellite geometric positioning model; parameters of the on-satellite geometric positioning model are corrected by utilizing a control point of a ground calibration field; and the corrected parameters are registered to a satellite. Since the traditional strict geometric imaging model is subjected to board division and optimization, the strict geometric imaging model is equivalent to the on-satellite geometric positioning model, the on-satellite geometric positioning model can adapt to the situation of limited on-satellite resources, the time hysteresis of positioning is reduced through real-time positioning treatment by means of the on-satellite geometric positioning model, the pressure on a digital transmission system by massive data downward-transfer is reduced, and finally errors of the system are reduced by adopting a parameter correction method based on satellite-ground collaboration, thereby improving the positioning precision.

The invention provides a parallel-air inlet type rear duct ejector in a variable cycle engine adjustable mechanism. The parallel-air inlet type rear duct ejector comprises an actuator cylinder, a link arm, a rotating shaft, a sleeve, a bearing, a bearing pedestal, an elastic collar, a connecting rod, an inner engine case, an outer engine case, a valve body, a sliding strip, a friction block and a friction block installation platform. According to the parallel-air inlet type rear duct ejector in the variable cycle engine adjustable mechanism, the actuator cylinder is used for carrying out driving, so that the outlet area of an engine outer duct is continuously adjustable, the structure is simple, the number of parts is small, the weight is low, and the parallel-air inlet type rear duct ejector is higher in stability and reliability compared with the design scheme of an existing variable cycle engine rear duct ejector.

The invention discloses a WIFI indoor positioning method and system for large-scale and complex scenes. The method includes: constructing a location fingerprint library of the location area based on reference point information of the location area; performing cluster analysis on the location fingerprint library to generate a location Multiple initial clustering results of fingerprints; based on the initial clustering results, construct the weighted similarity matrix of the location fingerprint library, and based on the weighted similarity matrix, divide the location fingerprint data in the location fingerprint library into multiple grids; The obtained RSSI data is matched with each grid center of the location fingerprint library, and the target to be positioned is divided into the grid with the highest matching degree; in the grid with the highest matching degree, the positioning result of the target is obtained by using the preset matching algorithm. The invention can effectively suppress the influence of noise and singular value on the positioning result, thereby ensuring the reliability and effectiveness of the indoor positioning result, and significantly improving the generation efficiency of the positioning result by reducing the calculation amount in the online matching stage.

The invention discloses a method for suppressing wake disturbance of a carrier aircraft based on direct lift control. The method is specifically as follows: step 1, establishing a nonlinear model of longitudinal motion of the carrier aircraft; step 2, aiming at the nonlinear model in step 1 Form, design a second-order h-γ cascade active disturbance rejection controller, use the extended state observer to observe the state variable of height and the state variable of glide angle respectively, and form the state error feedback and disturbance compensation, and get G L (δ); Step 3. For the nonlinear model form in step 1, design a second-order θ-q cascade active disturbance rejection controller, and use the extended state observer to observe the attitude angle state variable and the angular velocity state variable respectively, and form a state error feedback and disturbance compensation, to obtain C m (δ); according to C L (δ) and C m (δ), the actual rudder deflection is obtained by using the weighted pseudo-inverse method for control assignment. The invention accelerates the response speed of the control system of the carrier-based aircraft, and effectively improves the control precision and anti-interference ability of the carrier-based aircraft.

The invention provides a respirator. The respirator comprises an inspiration pipeline, an expiration pipeline, an expectoration pipeline and a central processing unit; the inspiration pipeline is provided with a positive pressure source for supplying positive pressure to a patient, a buffer tank and a two-position two-way balloon valve, and the two-position two-way balloon valve is subjected to on-off switching control through an air pump and a first two-position three-way valve; the expiration pipeline is provided with an expiration valve which is controlled though a second two-position three-way valve by receiving compressed air which is from the buffer tank and has preset constant pressure; the expectoration pipeline is provided with a negative pressure source for supplying negative pressure to the patient and a fast valve which is connected between the negative pressure source and the patient in series; the central processing unit conducts cooperative control over all the parts of the respirator according to data detected by a sensor in the respirator. According to the respirator, an expectoration machine can be embedded into the respirator by serving as a module, and higher precision, responsibility and safety are achieved; by adopting the same central processing unit, the system structure is simplified, and respiration and expectoration work of the respirator can achieve real synchronousness.