45results about How to "Improve engineering realizability" patented technology

The invention relates to a rapid alignment method with high precision for a strap-down inertial navigation system, belonging to the alignment method for the strap-down inertial navigation system. The method comprises the following steps of: collecting an output signal from an inertia measurement component, and obtaining the angular velocity and the specific force information of a vehicle; performing coarse alignment by the strap-down inertial navigation system; performing calculation by the strap-down inertial navigation system; performing precise alignment by the strap-down inertial navigation system; filter outputting and correcting; and finishing the precise alignment. The invention can be used for improving alignment precision and rapidness of the low-cost strap-down inertial navigation system; realizes azimuth alignment; and has the advantages of high feasibility and operability, and low cost.

The invention discloses a high-overload-impact-resistant synchronous four-channel folding wing locking and unfolding mechanism and an operation method of the high-overload-impact-resistant synchronousfour-channel folding wing locking and unloading mechanism. The folding wing locking and unfolding mechanism is installed on a rudder and comprises four rudder wings, locking buffering devices and aninitiator thrust cylinder. The four rudder wings are installed on the corresponding locking buffering devices correspondingly and connected with a rudder speed reducer through base output shafts. Theinitiator thrust cylinder is fixed to the center of the rudder, connected with the four rudder wings through locking claws and used for initial folding locking and in-place unfolding of the rudder wings. The high-overload-impact-resistant synchronous four-channel folding wing locking and unfolding mechanism has the features of being simple in structure, good in synchronism, reliable in locking andthe like. The high-overload-impact-resistant synchronous four-channel folding wing locking and unfolding mechanism is suitable for the application field of guided munition folding wings which are large in impact overload, short in unfolding time and high in synchronism requirement.

The invention provides an underwater array scanning laser imaging device comprising a carrier (1), an electrical module (19) and an imaging module (18), wherein the carrier (1) is the shell of the whole device; the electrical module (19) comprises a lighting laser (15), a combined inertial navigation unit (16) and a control processing unit (17); components of the electrical module (19) are fixed on two sides of an installation plate (22), and fixed with the carrier (1) via the installation plate (22); the imaging module (18) comprises a pitching servo mechanism (5), a rolling servo mechanism (6) and an optical imaging module (14); the optical imaging module (14) comprises an imaging lens (7), a filtering plate (8), a hating imaging sensor (9) and a lighting lens (10); laser emitted by the lighting laser (15) can be transmitted to the lighting lens (10) via an energy transmission optical fiber (11). The device provided by the invention has the characteristics of being miniature, and capable of achieving array scanning under water.

The invention provides a high-order digital filtering system and a high-order digital filtering method. By virtue of time-frequency conversion of a digital signal, parallel data are subjected to multiply-accumulation operation based on a frame form in a frequency domain through response to a filter coefficient frequency domain, so that digital parallel realization of high-order FIR filtering is finished. The fussy realizing way of the traditional parallel digital filtering by virtue of sequence recombination is greatly simplified.

The invention discloses a one-dimensional DOA estimation method based on a specific frequency combination signal. The method includes: transmitting a plurality of signals with specific frequencies, separating corresponding frequency signals from received signals of each array element through a plurality of narrow-band filters with different frequencies to obtain a frequency domain receiving data model, then normalizing a source signal matrix and reconstructing a frequency domain received data matrix, subjecting a uniform physical array to primary expansion to form a virtual non-uniform array,finally performing secondary virtual expansion on the virtual non-uniform array in combination with an existing non-uniform array data covariance matrix processing method, thus finally obtaining a virtual uniform array subjected to secondary expansion, and realizing secondary expansion of the array aperture. Under the condition that a traditional uniform array structure does not need to be changed, virtual expansion of the array aperture is achieved by receiving a plurality of narrow-band signals with specific frequencies and depending on the prior information of frequency proportion, so thatthe estimation precision is improved.

The invention discloses a satellite-borne terahertz ice cloud nadir detector system, which comprises an antenna and scanning subsystem, a multi-frequency-band terahertz receiving channel, a calibration subsystem, a data collecting and processing platform, a control power distribution system and control and signal processing equipment, wherein the antenna and scanning subsystem, the multi-frequency-band terahertz receiving channel, the calibration subsystem, the data collecting and processing platform and the control power distribution system are installed on a detection head part; the controland signal processing equipment is installed on a satellite platform; and the detection head part carries out conical scanning, and observation for a target, observation for a thermal calibration source body and observation for cold air are successively finished in a scanning process so as to realize the scanning imaging of ice cloud and the in-orbit two-point calibration of a detector. A receiving front end design scheme of an offset paraboloid reflector and a quasi-optics feed network is adopted, and conical scanning is carried out through a rotary antenna feeder system to realize the nadirobservation of ice water particles in cloud.

The invention discloses a single reflecting surface compact range device of high cross polarization isolation. The device is mainly composed of a reflecting surface of a single reflecting surface compact range, a feed source and a polarization grid. The feed source illuminates the precise reflecting surface of the single reflecting surface compact range and beforehand collimates and corrects spherical waves into planar waves. To lower shielding of the feed source, an offset feed structure is adopted in geometric layout, while the offset feed layout is the main reason of large cross polarization. The polarization grid is arranged in front of a planar wave silent area of the single reflecting surface compact range, and a silent area range is subjected to polarization filtering and gating, wherein the polarization states of the feed source and the polarization grid are controlled by respective controllers. Polarization and gating of the polarization grid have the advantages of wideband working, can almost completely reflect the polarization component parallel to polarization grid silk, almost completely transmit the polarization component perpendicular to the polarization grid silk and improve the polarization isolation of the single reflecting surface compact range to a great extent with the cost of introducing very small insertion loss. The engineering achievability of compact range system design is improved, and control over the dynamic range of a radio frequency system is improved.

The invention discloses a driven energy absorbing pulling/pressing both-way buffer capable of being repeatedly used, and belongs to the technical field of spaceflight equipment. The device is mainly composed of four parts including an outer barrel assembly, a middle barrel assembly, an inner barrel assembly and a pull barrel assembly, wherein the middle barrel assembly is coaxially arranged in theouter barrel assembly, the inner barrel assembly is coaxially arranged in the middle barrel assembly, and the pull barrel assembly is coaxially arranged on the periphery of the connecting position ofthe outer barrel assembly and the middle barrel assembly. According to the device, through an innovatively-designed aluminum honeycomb resetting mechanism, a mechanical spring resetting device and aratchet one-way locking device are combined with the pulling/pressing both-way buffer based on aluminum honeycomb crushing energy absorbing materials, and the advantages that a traditional driven energy absorbing both-way buffer is simple in structure, small in mass and high in reliability are sufficiently inherited; and the traditional pulling/pressing both-way buffer can be repeatedly used and can be used for repeatedly-used soft landing devices needed for multi-target deep space exploration tasks in future.

The invention discloses a method for quickly imaging absorption type defects of a large-aperture reflecting film element based on a photo-thermal imbalance technology. Modulated high-power laser is collimated and expanded to form large-size excitation light spots to irradiate and heat a reflective thin film element, and absorption type defects of a thin film generate periodic modulation temperature distribution on the surface of a sample, so that the reflectivity or transmittance of a defect area is periodically changed. After another low-power laser beam with a certain wavelength is collimated and expanded to form a large-size detection light spot, the large-size detection light spot is irradiated to the same area, irradiated by a heated laser beam, of the reflective film element at a certain incident angle, and the light field distribution of the detection laser beam reflected or transmitted by the film is imaged to a CCD target surface through an optical imaging system to be recorded. And a light field intensity image recorded by the CCD is analyzed to determine the absorptive defect of the irradiated area and the corresponding characteristics thereof. According to the method, the single detection area is greatly increased, and the rapid detection of the absorption type defect distribution of the large-aperture reflection film element becomes possible through scanning.

The invention provides an efficient discrete Fourier transform method. Reduced DFT (Discrete Fourier Transform) operation and butterfly operation are combined, and the method can realize the DFT operation of any odd point through a way that repeated iteration reduction is combined with a butterfly algorithm; and the method also can realize the DFT operation of any even number point and the odd point obtained after butterfly simplification is carried out through the way that the repeated iteration reduction is combined with the butterfly algorithm. Compared with the traditional DFT algorithm, the efficient discrete Fourier transform method adopts fewer complex multiplication operations so as to greatly lower operation complexity. The algorithm has the advantages of being simple and reasonable in architecture, few in resource expenditure and high in engineering realizability.

The invention discloses a square fuel assembly. According to the square fuel assembly, a guide pipe is coaxially arranged at the center of the square fuel assembly, and a control rod bundle is coaxially arranged in the guide pipe; supporting pipes are coaxially arranged at the four corners of the square fuel assembly and the center points of the four peripheral edges of the square fuel assembly; aplurality of fuel rods are coaxially arranged between a stiff plate and the center of the square fuel assembly. The invention discloses a single-flow supercritical water cooled reactor based on the square fuel assembly. The single-flow supercritical water cooled reactor based on the square fuel assembly comprises a plurality of square channels, the square channels are arranged to be adjacent to one another to form a honeycomb integral structure, and a metal reflecting layer is arranged outside the honeycomb integral structure; the square channels are used for containing the square fuel assemblies. Under the condition of meeting neutron economy, safety and engineering realizability, the design of fuel assemblies of water rods can be canceled, the design of a single-flow reactor core is realized, and the improvement of the economical benefit of fuel management is facilitated.

The invention discloses a method for loading a control rod of a supercritical water-cooled reactor and a structure. The method comprises the following steps: selecting one or more adjacent control rod components as a combined component; fixing the control rod components on the combined component on a control rod driving mechanism; and lifting or downward inserting one or more control rod components by the control rod driving mechanism. The structure comprises the control rod components and the control rod driving mechanism located on a supercritical water-cooled reactor pressure vessel, wherein one or more adjacent control rod components are fixed on the same control rod driving mechanism. According to the invention, the difficulty in designing a top cover of the supercritical water-cooled reactor pressure vessel is reduced, the running management procedure of the control rod components is simplified, and the economical efficiency, safety and engineering realizability of the supercritical water-cooled reactor are promoted.