3results about How to "Improve filtering accuracy" patented technology

This invention discloses a cavity electrically tunable preselection filter, relating to the field of wireless communication equipment. It includes a mounting cavity and a PCB board. The PCB board is fixed to the mounting cavity via connectors and houses an integrated circuit and a coil assembly. The mounting cavity contains four resonant cavities and two circuit-shielded resonant cavities. The four resonant cavities are arranged side-by-side along the length of the mounting cavity. The two circuit-shielded resonant cavities are arranged side-by-side along the width of the mounting cavity and located in the middle of the four resonant cavities, serving to shield the integrated circuit and provide resonance for the resonant cavities on either side. The coil assembly includes four coils for specific frequency bands. The four coils are electrically connected to the PCB board and located within the four resonant cavities. It features a compact structure, excellent filtering performance, and adaptability to complex electromagnetic environments.

This invention provides a signal correction method and system for a strain gauge earth pressure sensor under centrifugal conditions with hypergravity. The method acquires the original signal from the earth pressure sensor, piezoelectric vibration signals from the bottom of the basket and the top of the model box, and a strain gauge resultant force signal coplanar with the earth pressure sensor. The vibration signals are then subjected to FFT transformation and frequency domain difference to obtain the vibration frequency domain of the earth pressure sensor plane, and filtered. The actual hypergravity is decoupled by subtracting the bottom surface vibration signal from the strain gauge resultant force signal, and then converted back to the actual hypergravity at the sensor location. Pre-calibrated centrifugal acceleration-zero drift and centrifugal acceleration-sensitivity relationships are used for dual compensation, and the corrected pressure data is output. This invention systematically eliminates zero-point drift, sensitivity changes, and vibration interference caused by hypergravity, significantly improving measurement accuracy.

This invention provides a vegetation filtering method for dangerous rock slopes based on multi-dimensional features, comprising: Step 1, obtaining an initial three-dimensional model of the dangerous rock slope; Step 2, generating a reference surface based on the initial three-dimensional model; Step 3, initially filtering the vegetation of the dangerous rock slope; Step 4, further filtering the vegetation of the dangerous rock slope. This invention employs a layered filtering strategy of "initial filtering and secondary filtering" to filter vegetation on dangerous rock slopes, significantly improving filtering accuracy and effectively avoiding the problems of "over-stripping" and "under-stripping" in traditional methods.