38 results about "Matrix pencil" patented technology

The invention discloses a resonant grounding system single-phase grounding fault section positioning method integrated with high-frequency and power frequency zero-sequence component phase features, and the method comprises the steps: 1, processing a zero-sequence voltage and zero-sequence current, collected by each data collection device, through a matrix pencil algorithm, and obtaining the phases of all frequency components of the zero-sequence voltage and the zero-sequence current; 2, calculating the phase angle difference dph(50) of a zero-sequence voltage power frequency component and a zero-sequence current power frequency component of the same collection device; 3, calculating the phase angle difference dph(fm) of any one high-frequency component of the zero-sequence voltage and any one high-frequency component of the zero-sequence current; 4, calculating the absolute value dj of the difference between the phase angle difference dph(50) and the phase angle difference dph(fm); 5, recognizing a fault segment according to the size of dj. The method makes the most of the features of the high-frequency and power frequency components. Compared with a conventional resonant grounding system section position method based on transient features, the method does not need to carry out filtering.

The invention relates to a ground surface medium parameter inversion method based on single-base measurement, and relates to a ground penetrating radar. The method carries out the inversion of the medium parameters and conductivity of the ground surface through employing a measurement result of ground vertical incidence through a single antenna. The method comprises the steps: firstly carrying out testing and obtaining a reflection signal S11 when a single horn antenna vertically irradiates a soil surface or a metal plate based on a vector network analyzer; secondly introducing a Matrix Pencil (matrix beam) algorithm according to the testing result, and carrying out the recognition and separation of reflection signals of different interfaces; thirdly carrying out estimation and extracting a true reflection signal caused by the soil surface or the surface of the metal plate, thereby obtaining the real reflection coefficient of the soil surface. The method can effectively discriminate the reflection components of all interfaces, can filter out non-soil-surface reflection signals and other noise signals, enables the estimation precision to be improved, and is of great significance to the quick and accurate obtaining of the electromagnetic parameters of the soil surface.

The invention discloses a phase unwrapping algorithm based on UIF (unscented information filtering). The phase unwrapping algorithm comprises the following steps of firstly, establishing an UIF phase unwrapping algorithm recursive state estimation model, utilizing a phase gradient estimation method based on an AMPM (amended matrix pencil model) to obtain the phase gradient information required by the recursive state estimation model, and utilizing an LEVENBERG-MARQUARDT method to optimize the recursive state estimation model, so as to improve the algorithm convergence; introducing a heapsort quick mass map guide strategy, using the adjacent wrapping pixel of the unwrapped pixel as a heap array of a to-be-unwrapped pixel, and adjusting the heap array as the maximum heap according to the quality value of the to-be-unwrapped pixel; in each unwrapping step, utilizing the UIF phase unwrapping algorithm recursive state estimation model to unwrap the optimum to-be-unwrapped pixel at the root node of the heap array, deleting the pixel from the heap array, and adjusting the heap array as the maximum heap, until the phases of all wrapped pixels are unwrapped. The phase unwrapping algorithm has the characteristics that the accuracy is higher, and the stability is higher.

The invention discloses a resonance grounding system single phase grounding fault section positioning method utilizing phase voltage current break variable phase characteristics. The method comprises steps that step 1, a break variable of a phase voltage and a break variable of a phase current of each data acquisition device are calculated; step 2, phases of all frequency components of the phase voltage break variables and the phase current break variables are calculated through utilizing a matrix pencil algorithm; step 3, phase angle difference dph (50) of a phase voltage break variable power frequency component and a phase current break variable power frequency component of one same acquisition device is acquired; step 4, phase angle difference dph (fm) of any high frequency component of the phase voltage break variable and any high frequency component of the phase current break variable is calculated; step 5, an absolute value dj of the difference of the dph (50) and the dph (fm) is calculated; and step 6, magnitudes of all the dj are determined, and a fault section is identified. The method is advantaged in that zero sequence voltages and currents are not required, the phase voltage and the phase current of each phase are only required, compared with a resonance grounding system section positioning method based on the zero sequence voltages and currents, the method has further has properties of autonomy, no need of filtering and easy realization.