34results about How to "Good engineering feasibility" patented technology

The invention relates to a connector device for replenishing gas and liquid on the orbit. The connector device is used for replenishing gas and liquid for a target satellite by a service satellite on the orbit. The connector device comprises an active mechanism and a passive mechanism. The service satellite and the target satellite are positioned and conveniently separated through guide devices on respective butt-joint surfaces of the active mechanism and the passive mechanism, the service satellite and the target satellite are caused to move relative to each other through a drive mechanism having the axial spacing function, and the service satellite and the target satellite are locked through a positioning locking structure, so that the service satellite and the target satellite are guaranteed to be at fixed positions relative to each other in the on-orbit gas-liquid replenishing process. Through the measures, the efficiency of the on-orbit gas-liquid replenishing process is improved, and the safety of the on-orbit gas-liquid replenishing process is guaranteed.

The invention relates to a low-orbit satellite anchoring-based autonomous orbit determination method of Beidou navigation constellation. The low-orbit satellite anchoring-based autonomous orbit determination method comprises the steps of performing inter-satellite bidirectional pseudo-range observation by a Beidou inter-satellite link, sending Beidou inter-satellite bidirectional observation quantity information and prior position and speed information of a local satellite under a geocentric inertial coordinate system to an adjacent Beidou navigation satellite by the inter-satellite link; receiving Beidou downlink observation quantity information sent from a low-orbit satellite and autonomous orbit determination data of the low-orbit satellite; performing error correction on pseudo-range between Beidou double satellites and pseudo-range between the Beidou satellite and the low-orbit satellite, and eliminating a transceiving equipment error and a link error; and unifying the corrected pseudo-range between the Beidou satellite and the low-orbit satellite and the pseudo-range between the Beidou satellite and the low-orbit satellite to the same moment, decoupling inter-satellite distance and relative clock error in the bidirectional observation information between Beidou satellites, taking the low-orbit satellite pseudo-range, the distance between the Beidou satellites and the relative clock error as observation quantity, and calculating position, speed and clock error of the Beidou satellite by an extended Kalman filtering method.

Provided is a coaxial three-mirror zooming optical system based on photoisomerization materials. The coaxial three-mirror zooming optical system based on the photoisomerization materials comprises a primary mirror, a secondary mirror, a tertiary mirror and a caliber-variable diaphragm, wherein the caliber-variable diaphragm is located at a system exit pupil position in a short focal length mode, a system aperture diaphragm is arranged on the primary mirror, a classic R-C optical system is formed by the primary mirror and the secondary mirror, radiation light beams of a target scenery are converged by the primary mirror and the secondary mirror to form a middle real image, and the middle real image is imaged on the focal plane of the optical system through the tertiary mirror. According to the coaxial three-mirror zooming optical system based on the photoisomerization materials, the primary mirror, the secondary mirror and the tertiary mirror are made of the photoisomerization materials, changes of coefficients of aspheric surfaces of the mirrors are controlled through the material characteristics of the coaxial three-mirror zooming optical system in the zooming process of the coaxial three-mirror zooming optical system, and finally the coaxial three-mirror zooming optical system can have both the advantages of being large in focal length and high in resolution, and the advantages of being short in focal length and wide in field of view only through the changes of the coefficients of the aspheric surfaces of the mirrors and slight adjustment of the mirror spacing under the condition that the radii of curvature of all the mirrors of the optical system are unchanged.

The invention discloses an angle-adaptive high-precision mirror-body lateral support mechanism and belongs to the technical field of ground precision optical experiments with an aim to solve problems that application range is relatively singular, surface figure precision of an entire mirror body cannot guaranteed, the entire mirror body is heavy and complicated in structure. The angle-adaptive high-precision mirror-body lateral support mechanism comprises an annular support plate, multiple bonding blocks circumferentially and evenly distributed on the lateral wall of the mirror body and multiple support mechanisms circumferentially distributed; the bonding blocks are adhesively fixed with the lateral wall of the mirror body; each lateral support mechanism comprises a connecting rod,, a lever structure, a lever base, a lever center shaft, a lateral support base and a counterweight structure; one end of the connecting rod is connected to one end of the lever structure while the other end of the connecting rod is adhesively fixed with one bonding block, the other end of the lever structure is connected with the counterweight structure, the lever center shaft penetrates the lever structure, two ends of the lever center shaft are connected with the lever base, the lateral wall of the lever base is fixed on the lateral wall of the lateral support base through fixing bolts, and the lateral support base is arranged on the upper end face of the support plate.

The invention discloses a high thrust liquid rocket fault reconfiguration control method, which does a research on a fault reconfiguration strategy and a reconfiguration control technology of the high thrust liquid rocket during a booster ascending flight. Possible faults of the rocket are classified according to a logic sequence from a set to a unit to a fault type, a specialistic systematic knowledge base is built, and basic condition equations which need to be met for realizing fault reconfiguration are obtained through deduction; and a swing angle deviator when an engine works normally is acquired, and in view of each different fault condition, the swing angle deviator each time when a fault happens to the engine is detected; and finally, the basic condition equations which need to be met for realizing fault reconfiguration are used for calculating a specific form for a fault reconfiguration control law in each different fault condition. The rocket anti-fault ability is improved, and research on the high thrust liquid rocket is promoted.

The invention provides a phased-array antenna unit with flat-top directional diagram characteristics. The phased-array antenna unit comprises a metallic waveguide area and a free space area, wherein the metallic waveguide area is composed of a cylindrical waveguide and a conical waveguide connected with the cylindrical waveguide, a micro-strip plate laminating cylinder conformal array used for achieving flat-top wave beam unit directional diagram shape design through slot coupling is arranged on a port of the conical waveguide, evenly distributed eccentric round metal sheets are etched on each layer of micro-strip plates and arranged into a matrix, an light insulator is arranged on a cascaded superposition slot area of every two adjacent micro-strip plates, and then a free space area multi-layer conformal array unit is formed. The phased-array antenna unit has the advantages that the structure is simple, rotary symmetry is adopted for the structure, directional diagram equalization performance is good in the electric aspect, the unit can be applied to both linear polarization and circular polarization, external grating lobes generated during array scanning can be effectively restrained, margin gain of scanning can be improved, and the design method can be applied to a limited scanning two-dimensional phased-array antenna unit with a wide scanning range.

The invention discloses a GEO SAR satellite imaging method based on a single-reflector antenna, belongs to the field of overall design of high-orbit microwave imaging satellites, and aims to perform beam design on GEO SAR of a phased array feed source single-reflector antenna without attitude adjustment and cover all incident angle ranges only through distance-direction electric scanning. In orderto achieve the purpose, the technical scheme of the invention comprises the following steps: S1, selecting an antenna aperture according to the requirements of the minimum unambiguous area and resolution of the antenna, and selecting an antenna focal length according to the antenna aperture; s2, according to an incident angle requirement, calculating a lower visual angle range to obtain a scanning range required to be reached by the antenna, wherein the corresponding relation between the SAR downward viewing angle and the incident angle is shown in the specification, theta is the incident angle, alpha is the downward viewing angle, H is the orbit height and Re earth radius; and S3, setting an antenna feed source to form a scanning range required to be reached by the antenna, and performing satellite imaging.

The invention discloses an optimal single-relay distributed opportunistic channel access method under delay constraint. The method comprises the following steps that: each information source competesfor a channel, when only one information source exists, the information source obtains a channel access opportunity, otherwise, all the information sources restart channel competition; after the information source i competes successfully, the relay receives the RTS packet sent by the information source i, calculates the channel quality from the information source i to the relay, then sends the RTSpacket to the information sink i, the information sink i replies to the relay after receiving the RTS packet, and the relay node calculates the channel quality from the relay to the information sinki; the relay node feeds back all information to a signal source i, and the signal source i calculates the maximum transmissible rate and makes a decision: selecting an access channel, and selecting anoptimal single relay capable of reaching the maximum rate to perform channel access by the signal source i; otherwise, the information source i gives up the channel opportunity, and all the information sources compete for the channel again. According to the method, the user diversity and the time diversity are fully utilized, and the system throughput and the spectrum utilization rate are effectively improved.

The invention relates to a time-varying nonlinear ground physical similarity simulation method for a space interception process. High-speed motion components of two aircrafts are mapped into constant-value or uniform-speed motion through nonlinear transformation, and only remaining low-speed relative motion parts are simulated on the ground. The available space and the capacity of an executing mechanism in ground physical simulation can be fully utilized, so that the precision requirement of ground simulation is lowered, and good engineering realizability is achieved.

The invention discloses an immersion cleaning system and an immersion cleaning method thereof for chromium-polluted building garbage. The immersion cleaning system comprises sulphuric acid storing jars, alkali liquor storing jars, medicament stirring jars, a water retaining and discharging tank, pump tanks, an immersion cleaning tank body of which the section is rectangular, and a medicine distributing pipeline, wherein an acid discharging opening is formed in one side of each sulphuric acid storing jar, a discharging opening is formed in the other side of each sulphuric acid storing jar, andthe discharging opening of each sulphuric acid storing jar is connected with a first feeding opening of each medicament stirring jar through a pipeline; a second feeding opening for adding ferrous sulfate and a water inlet opening are also formed in the top of each medicament stirring jar; the immersion cleaning bank body is arranged on one side of the water retaining and discharging tank; and themedicine distributing pipeline is arranged along the long edge of one side of the immersion cleaning tank body. Treating liquid after immersion cleaning of garbage flows back into the water retainingand discharging tank from the discharging opening of the immersion cleaning tank body, and is drained out through a waste liquid pipeline arranged at the bottom of the water retaining and dischargingtank. The treatment period is short, the technological process is complete, the immersion cleaning course is simple and convenient to operate, and the repair effect is good. The immersion cleaning tank body has a leakproof function, and in the immersion cleaning course, liquid medicaments form liquid seal on the building garbage, so that dust raising is avoided.