45results about How to "Reduce the difficulty of engineering realization" patented technology

A detector signal readout channel multiplexing method comprises the steps as follows: grouping L detectors to form a first source signal and a second source signal; respectively introducing L detector signals into a first signal transmission line including two readout channels A and B and a second signal transmission line including two readout channels C and D, and simultaneously introducing first signal delay units and second signal delay units to the first signal transmission line and the second signal transmission line; and marking source detectors for signal forming according to the four readout channels A, B, C and D and obtaining final pulse information. According to the invention, only four readout channels are needed for one flat plane detector, and the problem that the number of one-to-one readout channels is too large is solved effectively. Time division multiplexing design of the transmission lines ensures that the waveform of signals output by detectors in different positions is similar to the mode of one-to-one readout, and the requirement on the dynamic range of a backend readout circuit is lowered. Moreover, the delay units are added, which greatly lowers the requirement on the time resolution of the backend readout circuit.

The invention discloses a multi-antenna space-based AIC receiver, and the receiver comprises an antenna array, a radio frequency front end, and a digital processing unit. The antenna array comprises a plurality of monopole antennas, and receives an AIS signal of a marine ship. The radio frequency front end comprises a plurality of radio frequency receiving channels, and completes the amplification filtering and frequency conversion of a radio frequency signal. The digital processing unit employs a blind separation and differential demodulation method to complete the separation and demodulation of multi-time-slot collision signals. The receiver is advantageous in that the number of multi-time-slot collision signals is large; the demodulation method is simple; the receiver can effectively monitor a high-ship-density sea area; the receiver exerts no special requirements for the array shape and aperture, and is especially suitable for a small-satellite platform.

The invention discloses a novel steering mechanism capable of realizing partial steer-by-wire function. The novel steering mechanism comprises a steering wheel, an electromagnetic contracting brake, asun gear, a plurality of planetary gears, a gear ring, a planetary carrier, a worm and a decoupling driving mechanism, wherein the steering wheel is fixedly connected with a steering column; the electromagnetic contracting brake is coaxially and fixedly connected with the steering column; the sun gear is coaxially and fixedly connected with the electromagnetic contracting brake; the planetary gears are circumferentially and uniformly arranged on the outer side of the sun gear and are in meshed transmission with the sun gear; the gear ring is arranged concentric with the sun gear, the inner ring is in meshed transmission with the planetary gears, and the outer ring is provided with worm gear teeth; the planetary carrier is rotationally connected with gear shafts of the planetary gears in the circumferential direction, and a tubular column structure vertically extends from the center of one side, away from the steering wheel, of the planetary carrier and is used for being connected witha steering gear; the worm is in meshed transmission with the worm gear teeth of the outer ring of the gear ring; and the decoupling driving mechanism is connected with the worm and is used for driving the worm to rotate. A control method of the novel steering mechanism capable of realizing the partial steer-by-wire function is further provided.

The invention discloses a terrain correction meter-wave radar altimetry method based on broadcasting automatic mutual monitoring signals, which mainly solves the problem of low precision in angle measurement and measurement in the prior art. Its implementation steps are: 1. Set up meter-wave altimetry radar and broadcast automatic mutual surveillance signal ADS‑B equipment; 2. Collect radar data, ADS‑B data and radar terminal data; 3. Obtain target elevation angle from ADS‑B data and Calculate the terrain search area; 4. Calculate the estimated value of the elevation angle according to the result of 3 and calculate the absolute error of the measured angle; 5. Obtain the value of the terrain parameter from the minimum absolute error of the measured angle, and smooth it, and then do data fitting to establish the terrain parameter Table; 6. Calculate the target elevation angle and height according to the terrain parameter table. The invention can not only compensate the height measuring error caused by terrain undulations, but also compensate the error caused by the height measuring approximate model, improve the angle measuring and measuring high precision, and can be used for three-coordinate positioning and tracking of airspace targets.

The invention relates to an aircraft attitude control method based on nonlinear feedback and differential tracking. The nonlinear feedback based on a time-optimal control integrated function is used as an attitude controller, while a rapidity control index is raised by more than 3 times and a control precision index is raised by more than 50%, compared with the background technology, the difficulty of project implementation is greatly reduced, and 4 control parameters are still maintained. An integral chain differentiator is used to design an uncertainty compensator, while the anti-interference ability of the controller is maintained, only one control parameter is needed, but a compensator used by the background technology needs 7 parameters. The whole control scheme needs 5 parameters, the control parameters are reduced by more than 50% compared with the background technology, and the difficulty of parameter setting is greatly reduced. A firefly algorithm is used to carry out the optimization tuning of the controller parameters, the number of setting iterations is reduced by more than 10 times compared with background technology, which has high engineering applicability.

An array detector signal readout channel multiplexing method comprises the steps of dividing array detectors into M groups; each group includes at least two detectors; readout channels are converted into M rows and N columns to readout signals in a rank coding manner, namely the ath row signal and the bth column signal are correspondingly output when the detector at the ath row and the bth column outputs a signal; the signals read out from the row and the column are respectively accessed to different positions of two transmission lines; and determining the source row and column number of the signal according to time difference when the signal reaches two end points of each transmission line, and marking the source detector where the signal is generated according to two groups of time differences of the row and column signals. Application of multiple electronics channels is prevented, and cost and engineering implementation difficulty of an electronics system are reduced; and due to the fact that application of a resistor weighting network is prevented during the channel multiplexing process, the amplitude of the signal cannot be largely changed due to different access points of the signal after multiplexing, and requirements on dynamic ranges of a rear-end readout circuit are reduced.

The invention provides a method of identifying a fully-polarized active false target based on a frequency diversity system. According to the technical scheme, the method comprises the following steps: after signals received by a channel H and a channel V of radar are synchronously sampled, 2M sub pulse echo signals are separated through digital variable-frequency filtering; then, 2M channels of data are output after matched filtering; and non-coherent integration and target detection are performed, the polarization characteristics of each detection result are extracted, and whether a target is true or false is identified. Based on a frequency diversity system, a radar target and the interference of a fully-polarized active false target can be effectively distinguished and identified by emitting multi-frequency signals and making use of the important characteristic that the polarization scattering property of a radar target is sensitive to the excitation frequency.

The invention relates to a modular series combined converter based on a multi-phase permanent magnet generator. The modular series combined converter comprises n three-phase windings, the alternatingcurrent output by any one of the three-phase windings passes through precharge modules, filters, standard rectifier modules and braking modules of the converter in order and then outputs a direct current, and the direct current is connected with a DC distribution board or a DC circuit breaker; the n groups of the same precharge modules, the n groups of the same filters, the n groups of the same standard rectifier modules and the n groups of the braking modules are respectively arranged in the independent 4 cabinets, and each cabinet comprises a set of cooling system. The modular series combined converter is high in integration modularization degree, high in output voltage and small in engineering implementation difficulty, is used for achieving the controllable electric energy conversion between the AC output of the multi-phase high-speed permanent magnet generator directly connected with a prime mover and a medium voltage DC grid.

The invention relates to a spatial solar power station for energy distribution collection conversion and beam centralized control emission in the field of space technology. The solar power station comprises a plurality of independent and identical energy collection conversion devices and a beam centralized control emission device which are all placed on a spacecraft platform. The energy collectionconversion devices are evenly distributed on a circle centered on the beam centralized control emission device, are fixed in relative positions to form a co-located satellite group. The solar power station having a large overall size is converted into multiple groups of identical devices which collect and convert spatial solar power in a distributed manner, are independent of each other, and do not affect each other. Each individual device is small in size and light in weight. The spatial solar power station is not required to be assembled and spliced in orbit, thereby reducing the requirements for carrying and greatly reducing the difficulty in engineering realization.

The invention discloses a synthesis gas washing system adapting to severe working conditions and a working method thereof, and relates to the technical field of synthesis gas washing. The system comprises a gasification furnace, a black water treatment system, a first-stage venturi scrubber, a cyclone separator, a second-stage venturi scrubber, a scrubbing tower and a water pump; the water pump communicates with the second-stage venturi scrubber through a second washing water inlet pipe, communicates with the first-stage venturi scrubber through a first washing water connecting pipe, and communicates with the gasification furnace through a gasification furnace chilling water pipe. Black water with high solid content and black water with low solid content are shunted; the solid content of black water entering the washing tower is obviously reduced; the problems of blockage and abrasion of a chilling water system in the starting, stopping and normal operation processes are effectively relieved, the reliability of the chilling water flow quantity and the stability of the liquid level of a chilling chamber are improved, the fault stopping probability possibly caused by the problems isreduced, and the first-stage wetting and cyclone separation equipment is low in engineering implementation difficulty and high in reliability.

The invention discloses a fast adaptive beamforming algorithm based on a block matrix. The algorithm mainly involves matrix block processing; a high-dimensional matrix is split into a low-dimensional matrix; overlapped parts in the operation process of the low-dimensional matrix are sorted and combined by using the particularity of adaptive signal processing and a recursive processing method, so that computation complexity can be reduced. According to the algorithm, a data covariance matrix does not need to be inversed, meanwhile, the dimension of the involved matrix is only half of that of an original matrix, so that the engineering implementation difficulty is reduced, a large number of operation resources are saved through dimension reduction operation; the method has a remarkable processing effect for large-scale array signals; and it is verified that the calculation efficiency of the algorithm of the invention is improved by 20% or above compared with a conventional self-adaptive algorithm.

The invention provides a noise frequency modulation signal identification method, and belongs to the technical field of communication. According to the method, the intrinsic characteristics of noise frequency modulation are extracted and judged by utilizing the characteristics of the noise frequency modulation in frequency spectrum and energy distribution, so that the purpose of accurately identifying the noise frequency modulation signal is achieved. Specifically, digital MPSK modulation signal judgment, digital MASK modulation signal judgment, digital MFSK modulation signal judgment and analog modulation judgment are sequentially carried out, and the residual frequency hopping signals are recursively sorted by utilizing the exclusiveness of two frequency hopping signals in the same period. Features are extracted through a signal time domain and a signal frequency domain, parameter estimation is carried out by means of spectral lines and frequency spectrums, noise frequency modulationsignal recognition is carried out according to a priority step-by-step confirmation method, and the method has the advantages of being simple in algorithm, small in calculated amount, easy in featureextraction and low in engineering implementation difficulty.