10 results about "Jitter noise" patented technology

The invention provides a linearity correction circuit and a linearity correction method for a successive approximation analog-to-digital converter, which are applied to the technical field of semiconductor integrated circuit design and are used for multiplexing part of capacitors in an analog-to-digital converter capacitor array to inject jitter noise so as to improve the linearity of an SAR ADC under small input amplitude and improve the linearity of the SAR ADC under small input amplitude in a sampling stage. An input signal is coupled to an upper pole plate of the DAC capacitor array, and meanwhile, a lower pole plate of the multiplexing capacitor unit is connected to a reference voltage controlled by a dither signal; after a phase is sampled and before the phase is converted, a lower pole plate of a multiplexing capacitor unit is switched to a fixed reference voltage, random jitter noise is injected at the moment, after the voltage of a top pole plate of a capacitor array is established stably, a comparator is enabled, successive approximation conversion is started, and the jitter noise is injected by multiplexing part of capacitors in the existing CDAC capacitor array, so that the random jitter noise is generated. The random jitter noise injection by using an extra capacitor array is avoided, the circuit design is simplified, the circuit cost and power consumption are reduced, and the linearity of the SAR ADC is improved.

The invention discloses a video change detection method and system based on double models, and relates to the field of intelligent traffic, and the method comprises the steps: combining a time model and a space model, achieving change detection through the judgment of a minimum normalized residual threshold, achieving the complementation of the time and space models, and achieving the inhibition of natural dynamic noise through the time model. The spatial model suppresses sudden jitter noise. Meanwhile, the time domain correlation of historical frames is captured through low-dimensional subspace projection, background estimation and standard deviation are dynamically updated, subspace base vectors can be updated in real time with low complexity, and background gradient is tracked. Pixel intensity change caused by jitter is predicted based on single-frame gradient distribution, a spatial mean value and variance are calculated through a probability grid, and adaptive adjustment is performed in combination with an inter-frame scaling factor. Historical jitter data is not needed, the jitter influence is directly predicted based on the single-frame gradient, and the detection accuracy is improved.

The invention relates to an SF6 gas density relay verification signal anti-jitter processing method and system, and the method comprises the steps: firstly collecting a switching value signal of a relay contact in verification in real time, and obtaining an original sequence containing jitter noise; then, a Kalman filtering algorithm is initialized, and meanwhile, a snow ablation optimizer (SAO) is configured; thirdly, constructing a fitness function containing smoothness, real-time performance and accuracy indexes, and taking minimization of the fitness function as a target to drive a snow ablation optimizer to optimize to obtain an optimal covariance matrix; the optimal parameters are injected into Kalman filtering, the state is reset, original signals are input point by point, and anti-jitter signals are output through recursive optimal estimation; and finally, judging and identifying a contact action moment through a threshold value, and recording a corresponding pressure / density value to finish verification. Compared with the prior art, the method has the advantages of being high in anti-jitter adaptability and universality, accurate in verification result, intelligent in verification process and the like.

This invention provides a time-domain correction method based on local adaptive thin-plate spline interpolation, comprising the following steps: S10, separating the pilot signal from the mixed measurement signal, performing fine phase tracking on the pilot signal, and extracting the phase noise sequence introduced by clock jitter; S20, converting the phase noise sequence into jitter at the sampling time; S30, determining the ideal sampling time, selecting several original sampling points adjacent to each ideal sampling time, obtaining a local interpolation subset, evaluating the jitter intensity of the local interpolation subset, and performing adaptive interpolation calculation accordingly to obtain the signal value at the ideal sampling time; S40, outputting the uniformly sampled signal sequence after interpolation reconstruction; this invention also provides a time-domain correction system based on local adaptive thin-plate spline interpolation. This invention solves the problems of poor real-time performance and weak adaptability of traditional TPS interpolation, achieving high-precision suppression of clock jitter noise and meeting the stringent requirements of phase measurement for space gravitational wave detection.

The present invention discloses a robust UAV scheduling method considering jitter noise and monitored object drift. The situation is as follows: there are several monitored objects in a given plane, and they can drift within a certain range; at the same time, some UAVs with determined positions but undetermined monitoring orientations are arranged, and there is jitter noise during their monitoring. The problem is: to give an effective orientation scheduling method for UAVs in the projected two-dimensional plane to maximize the expected monitoring utility. The present invention first gives a probability model of monitoring quality and a monitoring utility model, and proposes a formalized problem; secondly, proposes a method to linearize and discretize the non-linear and continuous monitoring quality through region discretization; thirdly, finitizes the infinite solution space and restricts the change amount of the coverage area by dividing the orientation angle; finally, uses a greedy algorithm to effectively select orientations from the solution space to obtain the final result and restricts the error. The present invention first proposes a robust UAV scheduling method and gives an effective approximation algorithm.

An optical navigation method includes: providing an optical sensor to operate in a run mode to sense pixel images to perform a displacement calculation; performing a low feature detection upon the sensed pixel images; and, controlling the optical sensor switching from the run mode into a rest mode in which the optical sensor does not perform the displacement calculation when the low feature detection indicates a low feature condition result.

The utility model discloses a low-noise high-low pressure pipeline assembly which comprises a high-low pressure pipeline assembly body, the high-low pressure pipeline assembly body comprises a high-pressure pipe and a low-pressure pipe, and a fixing mechanism is arranged on one side of the high-pressure pipe and one side of the low-pressure pipe. The fixing mechanism comprises a mounting position, a fixing screw rod, a fixing piece, a fixing hole, a rubber damping connecting piece and a locking nut, the mounting position is arranged on one side of the high-pressure pipe and the low-pressure pipe, the fixing screw rod is fixedly arranged on the surface of the mounting position, the fixing piece is arranged on one side of the mounting position, the fixing hole is formed in the surface of the fixing piece, and the rubber damping connecting piece is arranged in the fixing hole. And the fixing holes are formed in the outer side surfaces of the fixing screw rods in a sleeving manner. According to the utility model, the mounting structure of the high-low pressure pipeline assembly is improved, so that the problems of vibration caused by vibration and loosening and shaking noise caused by vibration can be effectively solved, and the use effect of the high-low pressure pipeline assembly can be improved.

The present application relates to a kind of SF6 gas density relay verification signal anti-jitter processing method and system, comprising: first, the switching quantity signal of relay contact in verification is collected in real time, and the original sequence containing jitter noise is obtained;Then initialize Kalman filtering algorithm, while configuring Snow Ablation Optimizer (Snow Ablation Optimizer, SAO);Then build fitness function containing smoothness, real-time, accuracy index, with its minimization as goal drive Snow Ablation Optimizer optimization, obtain optimal covariance matrix;Optimal parameter is injected into Kalman filtering and resets state, then input original signal point by point, and output anti-jitter signal by recursive optimal estimation;Finally, through threshold value judgment identifies contact action time, records corresponding pressure / density value and completes verification.Compared with prior art, the present application has the advantages of high anti-jitter adaptability and universality, accurate verification result, intelligent verification process and the like.

The invention discloses a true random number generator entropy source for enhancing jitter noise level, comprising: a plurality of basic units, each basic unit comprising an L input end, an R input end and a total output end; the L input end is connected with the total output end of the previous-stage basic unit; the L input end is connected with the L input end, the R input end is connected with the total output end of the basic unit of the later stage or the later stages, and when the L input end is the same as the R input end, the total output end is in a state opposite to the previous state and is in an oscillation state in time; when the L input end is different from the R input end, the total output end takes the value of the L input end. By implementing the entropy source of the true random number generator, the jitter noise level can be effectively enhanced, and continuous oscillation under the condition of lacking a steady state is ensured, so that higher-quality randomness is provided, and the entropy source is suitable for a high-performance true random number generator.

The application discloses a kind of single ring oscillator true random number generator circuit structure, the circuit structure includes ring oscillator, fast oscillation circuit, counter, eigen transistor, exclusive or gate, reset signal generating circuit and post-processing circuit.The circuit structure of above-mentioned, the two different inverter stages of ring oscillator are XOR and the width of rectangular pulse generated by output is determined by the change caused by time-invariant inherent propagation delay and time-varying jitter noise, the width of the continuous pulse generated is quantified by fast oscillation circuit and counter, that is, the delay change caused by jitter noise can be represented from the minimum significant bit of the above-mentioned counter;By changing the gate voltage of eigen transistor, the supply voltage of ring oscillator is adjusted, so that the amplitude of the jitter noise of ring oscillator is maximized by reducing its charging / discharging current, so that the true random number generator circuit structure has the application effect of high energy efficiency and high throughput.