33results about How to "Method algorithm is simple" patented technology

The invention relates to a three-level active electric filter compensation current calculation method based on non-harmonic detection control. An IGBT start pulse signal, a DC side capacitor voltage and a power source voltage are utilized to calculate an inductor voltage, and a compensation current outputted by a three-level active electric filter is further acquired. A cascade signal delay cancellation (CDSC) module is utilized in a calculation process to acquire a compensation current error signal, and calculation accuracy is improved. The whole calculation process is simple and reliable, advantages of non-harmonic detection control are integrated, and the method is suitable for all NPC type and T type topological three-level active electric filters based on non-harmonic detection control.

The present invention discloses a method for watermarking robust audios with invariable time scale based on zero-crossing rates, which comprises the following steps: firstly, dividing an original audio signal A into a plurality of nonoverlapping audio frames; secondly, calculating the zero-crossing rate of each audio frame, and selecting M1 audio frames with larger zero-crossing rates for embedding watermarks according to a preset threshold value T; thirdly, dividing each one of the M1 audio frames into a plurality of nonoverlapping audio segments of which the number is accordant with the total bit number of the watermarks to be embedded, quantizing the average value of nonoverlapping audio segment samples so as to embed watermark bits, and modifying sample values which correspond to each audio segment of the watermarks to be embedded, quantizing the average value of nonoverlapping audio segment samples so as to embed watermark bits; and finally, interconnecting the audio segments containing the watermarks to obtain audio frames containing the watermarks so as to form the final audios with the watermarks. The method has a simple algorithm, is applicable to all types of audio signals, and not only can effectively resist attacks of conventional signal processing, but also has strong robustness for time scale modifications in a resampling form., but also has strong robustness for time scale modifications in a resampling form.

The invention discloses a method for prolonging the shooting time of a high-speed camera, comprising the following steps: firstly, compressing a high-resolution image collected by a CCD or a CMOS at the high-speed camera end, and storing the obtained compressed image data in a memory of the high-speed camera; Secondly, the compressed image data in the high-speed camera memory is imported into the computer through the high-speed camera data interface or network, and the desired image is restored on the computer side through the compressed image reconstruction algorithm. The algorithm of the method of the present invention is simple and easy to realize by hardware. Only the pixel discarding operation needs to be performed on the high-speed camera side, and the shooting duration of the high-speed camera can be extended in the existing high-speed camera through minor hardware or software changes.

The invention belongs to the technical field of a generating set, and specifically relates to a transient parameter automatic calculating method of a generating set waveform recorder. The transient parameter automatic calculating method of a generating set waveform recorder includes the steps: calculating the transient regulate rate and stabilization time, and the transient voltage change rate and stabilization time of a generating set; combining with rated parameters of the generating set, according to the alternating-current voltage transient waveform curve acquired by a generating set waveform recorder, automatically and accurately drawing the peak value envelope curve of the alternating-current voltage signal; according to the drawn peak value envelope curve or the rotating speed transient waveform curve, accurately capturing the transient value and the corresponding time when the transient change occurs in the waveform, and when the transient change occurs in extremum and when stable operation is recovered; and combining with the rated parameters of the generating set, automatically calculating the transient parameters of the generating set, such as the transient regulate rate and stabilization time, and the transient voltage change rate and stabilization time. When a test person performs a generating set transient parameter test, only the rated parameters of the generating set are given, thus greatly reducing the work load of the test person.

The embodiment of the invention discloses a face anti-counterfeiting method and device, which are used to simplify the face anti-counterfeiting method. The method in the embodiment of the present invention includes: acquiring a first human face image through a first camera and acquiring a second human face image through a second camera, wherein the first human face image and the second human face image are images belonging to the same human face; Find the first distance value of the first face image according to the preset distance rule; find the second distance value of the second face image according to the preset distance rule; judge the first face according to the first distance value and the second distance value Whether the image and the second face image are obtained by ingesting a living human face; the preset distance rule is to extract the key points of the face image, and obtain the distance value according to the distance between the key points, and the key points are used to represent the facial features. Whether it is a living human face can be judged by analyzing different face images. Compared with methods such as 3D modeling, this method has a simple algorithm, is easy to implement, and reduces costs.

The invention relates to an automobile overspeed monitoring technology, in particular to a method for monitoring automobile overspeed based on distributed optical fibers. The method for monitoring vehicle overspeed based on distributed optical fibers of the present invention includes experimentally determining the frequency characteristics of the vehicle and monitoring the vehicle speed on the spot. Advantages: Make full use of the distributed optical fiber equipment in the existing road section, and realize the speeding detection of passing vehicles without increasing the cost. The whole method has simple algorithm and small calculation amount, and expands the application field of distributed optical fiber.

The invention provides a method for suppressing multiple access interference of a spread spectrum receiver based on spectrum detection. On the basis of the traditional partial correlation FFT spread spectrum signal acquisition algorithm, the method utilizes the autocorrelation spectrum characteristics of the spread spectrum code and the relationship between the codes of the same family. The cross-correlation spectrum characteristics between them, double detection of useful signal and multiple access interference on the received signal superimposed with multiple access interference, can suppress multiple access interference in the stage of spread spectrum signal pseudo-code and carrier acquisition, this method in spread spectrum The application in the receiver solves the problem of false code or carrier error capture caused by the existence of multiple access interference. The method has the characteristics of simple implementation and obvious effect of anti-multiple access interference.

The invention provides a Capon beamforming-based positioning method and device. According to the Capon beamforming-based positioning method and device, K receiving antennas are set to form a signal receiving array, and M signal transmitting points are set; a covariance matrix Rxx is calculated by using a signal matrix outputted by the signal receiving array; the constraint optimization problem of the linearly constraint minimum variance criterion is solved, so that a spectral function can be constructed; M maximum spectral peaks are searched; and a direction of arrival is calculated. According to the method, beacon points deployed in a monitoring area are adopted to be networked with a wireless gateway so as to communicate with the wireless gateway; data are transmitted to a cloud end through a wireless communication module; cooperative sensing is performed, and the information of signal transmitting points in a network coverage area is acquired and positioned; the monitoring data of the cloud end are matched with a map and the like, so that intelligent parking can be realized. With the method adopted, the number of vehicles does not need to be known in advance or estimated, and therefore sampling data length can be decreased; desired signals are enhanced, interference is suppressed, and therefore, the signal to interference plus noise ratio of the output of a system can be improved; and a robust Capon algorithm is modified to improve the deviation of a direction vector from an actual environment, and therefore, positioning performance can be improved.

The invention provides a method for determining satellite attitude based on a visible light earth sensor. The method employs the visible light earth sensor to determine the two-axis attitude of a satellite relative to the earth and comprises the following steps: processing an earth image produced by a CMOS imaging device so as to extract the effective boundary of the earth image; then extracting the center of the effective boundary by using least squares fitting; and on the hypothesis that the attitude angle of the satellite relative to the earth is a small angle, approximately calculating the roll angle and pitch angle of the satellite relative to the earth so as to eventually determine the two-axis attitude of the satellite relative to the earth. Compared with a traditional method using an infrared earth sensor for determination of the rolling and pitching two-axis attitude of satellites relative to the earth, the method provided by the invention has the advantages that the method improves the measurement precision of the two-axis attitude of the satellite relative to the earth, is applicable to measurement of the attitude miniature micro-satellites and conforms to the current development trend of micro-satellites.