35 results about "Ratio Sequence" patented technology

The invention provides a PFC (power factor correction) control method with high input power factor and a control circuit thereof. The method comprises the steps of controlling a switching tube to be switched on and switched off according to the principle of leading impulse area to be equivalent, and leading input inductive current and sinusoidal half-wave current to have the equivalent impulse area in each switching period, thereby realizing the high power factor (PF); furthermore, the higher the switching frequency, the closer to 1 the PF value is. In the control circuit, a circuit topological structure of a Boost converter and a control circuit for realizing a variable duty ratio sequence jointly constitute a PFC stage of a commonly used LED (light-emitting diode) driving power supply, the front stage of the PFC stage is connected with the output end of a non-controllable rectifier bridge of a single-phase diode via an input filter capacitor, the back stage of the PFC stage is connected with a DC/DC (direct current/direct current) stage of the commonly used LED driving power supply via an output filter inductor and an output filter capacitor. By adopting the PFC control method, not only the very high input power factor can be realized, but also output voltage ripple can be reduced; furthermore, the control circuit is simple and easy to realize an analog circuit, thereby being conductive to large-scale integration.

The invention discloses a multistage pulse amplitude modulator with a function of achieving amplitude equalization of a modulation signal. The multistage pulse amplitude modulator comprises n Mach-Zahnder intensity modulators in series connection, wherein input ports and output ports of the Mach-Zahnder intensity modulators are connected end to end, and the input port of a first Mach-Zahnder intensity modulator is utilized as a light source input port, the output port of a final Mach-Zahnder intensity modulator is utilized as a modulation signal output port, and OOK signals with the same amplitude are loaded to each Mach-Zahnder intensity modulator, thereby achieving the modulation of 2N-stage pulse amplitude modulation signals; the effective modulation arm length ratio among the n Mach-Zahnder intensity modulators is 20 : 21: 22 : ... : 2N-1, and the arrangement sequence of the Mach-Zahnder intensity modulators with the above effective modulation arm length ratio does not limit to the above ratio sequence. According to the multistage pulse amplitude modulator with the function of achieving the amplitude equalization of the modulation signal, by improving the structure of the modulator, the flexible control of a phase bias point and the equalization of optical signals on the two arms of the modulator when the modulation signal is modulated are achieved, and the extinction ratio of the modulator is increased.

The invention discloses a method for positioning a blockage point in a non-metal pipeline by means of ground penetrating radar. The method includes the following steps: 1, obtaining test data of a blocked segment in a non-metal pipeline by means of ground penetrating radar; 2, obtaining a random number of scan points of a random number of scan lines, and selecting natural resonant response wave bands of the scan points right over the pipeline; 3, extracting the pole resonant frequency, and obtaining a resonant frequency difference; 4,obtaining a corresponding water level through interpolation; and 5, obtaining a caliber water level ratio sequence, drawing a relation curve of a scan line position and a caliber water level ration, and obtaining a water level sudden drop point, wherein the position of the scan line corresponding to the point is a blockage point of the non-metal pipeline. The blockage point in a non-metal pipeline can be quickly positioned. Therefore, the detection cost is reduced, the on-line detection difficulty is reduced, and the work efficiency is improved.

The invention discloses a weighing characteristic face recognition method for a multichannel pulse coupling neural network. The weighing characteristic face recognition method comprises the step 1, acquiring an original face color image, the step 2, converting the original face color image from an RGB color space to an HIS color space to obtain a converted face image, the step 3, respectively extracting three channels of data of the hue H, the saturability S and the illumination I of the converted face image, the step 4, using a PCNN technique to carry out iteration ignition treatment on the three channels of data of the H, the S and the I of the converted face image to generate three channels of pulse ignition ration sequences, the step 5, carrying out weighing treatment on the three channels of the pulse ignition ratio sequences and then connecting the weighed number sequences to form an overall pulse ignition ratio characteristic sequence spectrum of the converted face image, and the step 6, using the overall pulse ignition ratio characteristic sequence spectrum of the converted face image and a face sample sequence spectrum in a template base to carry out relevance match to recognize a right face image. The weighing characteristic face recognition method greatly improves the recognition rate of face images.

The invention discloses an improved soft output tail biting convolution code decoding method. The method comprises the following steps of (1) acquiring a logarithmic likelihood ratio sequence; (2) calculating a branch metric; (3) calculating a forward metric; (4) calculating a backward metric; (5) calculating an information-bit logarithmic likelihood ratio to form the logarithmic likelihood ratio sequence; and (6) deciding. In the invention, the branch metric is calculated for one time, the forward metric and the backward metric are calculated for twice, and through using splicing, combination calculating is performed on a logarithmic likelihood ratio, a complexity is low and decoding performance is increased. In the invention, the information-bit logarithmic likelihood ratio sequence is calculated and is served as soft output, a tail biting convolution code can be served as an internal code which can carry out iteration with an external code in a whole system and an application value is expanded.

The invention discloses a polar code coding and decoding method for m-ary orthogonal spread spectrum signal, mainly solving the problem of poor bit error rate performance of m-ary orthogonal spread spectrum hard decision decoding in prior art and comprising the specific steps of: (1) reading an information sequence to be sent; (2) performing polar code coding on the information sequence; (3) performing interleaving processing on the polar code coding sequence; (4) performing m-ary orthogonal spread spectrum; (5) extracting a log-likelihood ratio sequence; (6) de-interleaving the log-likelihoodratio sequence; and (7) decoding the polar code. According to the soft-decision method of extracting the log-likelihood ratio sequence, the invention combines high-efficiency polar code coding and decoding with m-ary orthogonal spread spectrum, and has the advantages such as good error code performance, low complexity and high spectral efficiency, which meets the requirements of the channel coding and decoding technology for efficiency and reliability.

The invention discloses a Copula and Monte-Carlo simulation based path stroke time estimation method. The method comprises the steps that S1) the fluctuation ratio of path stroke time of different segments in a path is obtained; S2) edge distribution fitting is carried out on the fluctuation ratio of path stroke time of different segments by means of maximum likelihood estimation; S3) a Copula theory is used to fit a path stroke time fluctuation ratio distribution function on the basis of a distribution function of the fluctuation ratio of path stroke time of different segments; S4) Monte-Carlo simulation is used to obtain a path stroke time fluctuation ratio sequence on the basis of the Copula function; S5) a confidence interval in certain confidence level is determined, and an expected value of the path stroke time fluctuation ratio is calculated; and S6) the expected value of the path stroke time fluctuation ratio is combined with path stroke time in the last period to estimate thepath stroke time of the present period. Sequential fluctuation of stroke time of the different segments as well as spatial relation between the segment stroke time is taken into consideration, time-space characteristic of the stroke time is dug deeply, and the precision and reliability are higher.

A multiple layers channel decoding method of communication system comprises steps: calculating the original branch path magnitude corresponding with all decoding layer; in every decoding layer, updating the original branch path magnitude corresponding with the decoding layer based on the prior information of relative decoding layer generated by iteration step or the prior information of relative other decoding layer generated by current iteration step; coding the result of updating; and repeating the updating step and the coding step until the set iteration times is achieved; deciding the likelihood information of coding layer output in said steps to obtain the estimated value of ratio sequence. Adopting the coding method of said mechanism, comparing with traditional coding method with soft input and soft output, the performance is similar, at some SNR points, perfect performance is put up, and less calculation complexity, it is easy to be realized, power can be decreased, delay of coding is small.

The embodiment of the invention discloses a design wind speed analysis method and device for a power transmission tower, and can simultaneously consider a complex terrain influence and a typhoon-combined climate extreme value distribution characteristic tail deviation influence. The analysis method includes of 1, establishing a power transmission tower target position CFD terrain model; 2, selecting meteorological stations which have a certain of historical records and are distributed at the predetermined periphery in all the directions of the target position of the power transmission tower, obtaining the wind speed ratio sequence of the predetermined height at the predetermined incoming flow positions in all the directions of the target position of the power transmission tower and the predetermined height at the target position of the power transmission tower, and through the history records of the corresponding wind speed and wind direction of the corresponding meteorological stations, obtaining the extreme value wind speed sequence of the target position of the power transmission tower; 3, sampling in the extreme value wind speed sequence through an independent storm method to obtain extreme value wind speed samples, obtaining the probability density function of the mixed climate extreme value wind speed, calculating the parameters corresponding to the probability density function through a weighted least square method, and obtaining the extreme value wind speed in a discretional return period of the target position of the power transmission tower.

The invention discloses a method for predicting asset price trend. The method comprises the steps of obtaining year-on-year sequence data of multiple types of assets corresponding to an observation moment; performing frequency domain filtering on the same-ratio sequence data of each type of assets according to the plurality of observation periods to obtain a filtering sequence of each type of assets in each observation period; merging the filtering sequences of the multiple assets in each observation period to obtain a filtering merging sequence corresponding to each observation period; inputting the year-on-year sequence data and the filtering merging sequence of each type of assets into a linear regression model to obtain regression parameters corresponding to each type of assets; and predicting the trend of the price of each type of assets according to the regression parameters and the filtering merging sequence corresponding to each type of assets. The invention further discloses aserver and a computer readable storage medium. The invention provides a method for obtaining asset trend information based on the economic cycle change rule of assets. The asset price trend can be accurately predicted.

A method and apparatus for generating a phase-locked output signal includes generating an intermediate signal phase locked to an input signal by frequency dividing the intermediate signal by a temporally-varying divide ratio sequence to generate a first feedback signal and phase comparing the first feedback signal with the input signal. An output signal is generated phase locked to the first feedback signal by frequency dividing the output signal by the temporally-varying divide ratio sequence to generate a second feedback signal and phase comparing the second feedback signal with the first feedback signal.

The invention discloses a processing method which is used for measured data of the stable oxygen and hydrogen isotope ratio in water vapor and is beneficial for eliminating errors generated when water vapor isotopes are determined with an isotope spectrometer. The method comprises the steps that the stable oxygen and hydrogen isotope ratios of specific water under multiple preset humidity values are measured with the spectrometer, and a first ratio sequence is obtained; the stable oxygen and hydrogen isotope ratio of the specific water under a specific humidity value is measured with the spectrometer; high-order polynomial fitting is conducted to obtain a humidity normalization formula for the spectrometer according to the first ratio sequence, the stable oxygen and hydrogen isotope ratios under the humidity values and the stable oxygen and hydrogen isotope ratios under the specific humidity value; a current humidity value and the stable oxygen and hydrogen isotope ratio under the current humidity value of measured water vapor are measured with the spectrometer; the stable oxygen and hydrogen isotope ratio of the measured water vapor under a humidity value normalized to the specific humidity value is obtained according to the normalization formula and the current humidity value and the stable oxygen and hydrogen isotope ratio under the current humidity value of the measured water vapor.

The invention provides the adjusting method of a power spectrum estimation value and a terminal. In the prior art, a direct current component in a power spectrum is difficult to completely eliminate.In the invention, the above problem is solved. The method comprises the following step of if a narrowband signal is included, adjusting the power spectrum estimation value of the second group of frequency points according to the average power spectrum estimation value of the first group of frequency points, wherein a frequency interval between each frequency point in the second group of frequencypoints and a target frequency point is greater than or equal to a first preset threshold and is less than or equal to a second preset threshold, the frequency interval between each frequency point inthe first group of frequency points and the target frequency point is greater than the second preset threshold, and the second group of frequency points includes a plurality of preset frequency pointswhich are adjacent to each other. In the invention, a power spectrum which does not contain the narrowband signal can be acquired, a purpose of eliminating the direct current component in the power spectrum is realized, the ranking of the effective frequency points in a power window ratio sequence can be increased and terminal full frequency band sounet time can be shortened.

The invention discloses a cell signal power measurement method. The method comprises the following steps: receiving sample point-level synchronized data at a frequency point of a to-be-measured cell by a terminal; acquiring receiving training sequence frequency domain data and receiving training sequence time domain data from the received data; dividing local training sequence frequency domain data by the receiving training sequence frequency domain data to obtain a frequency domain ratio sequence; dividing the local training sequence time domain data by using the receiving training sequence time domain data to obtain a time domain ratio sequence; performing slipping autocorrelation on the frequency domain ratio sequence to obtain the frequency domain measurement power; performing slippingautocorrelation on the time domain ratio sequence to obtain time domain measurement power; and taking the greater value in the frequency domain measurement power and the time domain measurement poweras the cell signal power. Through the technical scheme disclosed by the invention, the influence on the cell signal power measurement by the timing deviation and frequency deviation can be effectively reduced, and the measurement precision is improved.

The invention discloses a data processing method and device. The data processing method comprises the steps: obtaining vehicle information corresponding to each designated road section in a pluralityof designated road sections, wherein the vehicle information comprises the vehicle violation absolute number and the vehicle traffic volume; for each designated road section, calculating according tothe vehicle violation absolute number and the vehicle traffic volume corresponding to the designated road section to obtain a traffic violation ratio corresponding to the designated road section; performing numerical value sorting on the traffic violation ratio corresponding to each specified road section in the plurality of specified road sections to obtain a traffic violation ratio sequence of each specified road section; screening out a plurality of specified road sections with large pass-to-violation ratio values in a first specified proportion from the pass-to-violation ratio sequence ofeach specified road section; and marking each screened specified road section as a violation high-incidence road section. According to the invention, the technical problem of how to determine the violation high-incidence road section in the related art can be solved.

The invention relates to a unit ratio sequence-type transmission mechanism capable of being independently controlled. The unit ratio sequence-type transmission mechanism comprises a first planetary gear set, a second planetary gear set, an energy input end and a free transmission end, wherein the first planetary gear set comprises an energy output end; the second planetary gear set is connected to the first planetary gear set and comprises a control end; the energy input end is arranged on the second planetary gear set; and the free transmission end is arranged on the first planetary gear set, controlled by the control end and used for freely switching the free transmission end to be used as one of the energy input end and an energy output end. The unit ratio sequence-type transmission mechanism disclosed by the invention has the beneficial effect of improving the energy transmission efficiency.