7results about How to "Reduce phase distortion" patented technology

The application discloses a Φ-OTDR and MZ-Sagnac fusion system XPM crosstalk suppression method based on single-pulse period local symmetry pairing, and is suitable for a single-fiber composite sensing system which integrates a Φ-OTDR module and a MZ-Sagnac interference module in the same sensing optical fiber through a wavelength division multiplexing mode. The method of the application obtains a pulse trigger signal and an interference output signal of the Φ-OTDR, synchronously segments the interference output signal according to a pulse repetition period, determines a local time window and a center position of the local time window affected by XPM crosstalk in each single-pulse period, then performs a weighted pairing operation on equidistant sampling points on both sides of the center, obtains a local recovery signal and an XPM crosstalk estimation component, and corrects a contaminated signal by using the local recovery signal, so as to realize XPM crosstalk suppression, improve the phase demodulation precision, disturbance positioning ability and event identification reliability of the composite sensing system.

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 invention provides a wafer-level acoustic function testing method and a supporting substrate, and relates to the technical field of wafer-level testing. The method comprises the following steps: firstly, providing an acoustic sensor wafer of which the surface is provided with a protection structure, and thinning the acoustic sensor wafer; a supporting substrate is provided, and the acoustic sensor wafer and the supporting substrate are bonded through a bonding material to form a bonded wafer; wherein the supporting substrate is provided with a through hole window and a first slotting structure, the position of the through hole window corresponds to the position of a functional area of a wafer, and the position of the first slotting structure corresponds to the position of a cutting channel of the wafer; then the bonding wafer is placed on the cutting workpiece, and the protection structure on the surface of the bonding wafer is removed; cutting the substrate of the acoustic sensor wafer along the cutting channel until the bonding material or the supporting substrate is exposed; and finally, the bonded wafer is taken down from the cut workpiece, and a wafer-level acoustic function test is carried out. According to the scheme of the invention, the method has the advantages of acoustic fidelity, wafer-level operation robustness and inter-chip acoustic isolation.

This invention belongs to the field of radio frequency integrated circuit technology and discloses a stacked broadband radio frequency amplifier and its wireless transceiver circuit. The stacked broadband radio frequency amplifier includes an input impedance matching network, a first stacked amplifier circuit, a second stacked amplifier circuit, and an output impedance matching network. The input terminal of the input impedance matching network serves as the input terminal of the stacked broadband radio frequency amplifier and is connected to the radio frequency signal input terminal. The output terminal of the input impedance matching network outputs the radio frequency signal to the first stacked amplifier circuit. After receiving the radio frequency signal, the input terminal of the first stacked amplifier circuit outputs a first-stage amplified radio frequency signal. After receiving the first-stage amplified radio frequency signal, the first stacked amplifier circuit further amplifies and outputs a second-stage amplified radio frequency signal. The input terminal of the output impedance matching network receives the second-stage amplified radio frequency signal and outputs the amplified radio frequency signal. The amplifier structure of this invention is simple and has excellent high power output, low phase distortion, and wide temperature stability.

The utility model discloses a kind of coil loudspeakers. The loudspeaker is sequentially sleeved and concentrically arranged from inside to outside by dome tweeter, annular midrange loudspeaker, annular woofer, and three-way unit;Among them, the tweeter adopts dome diaphragm, the midrange loudspeaker adopts first annular diaphragm, and the woofer adopts second annular diaphragm;The three-way unit is used for dividing audio signal into high-frequency band, mid-frequency band and low-frequency band, and inputting into corresponding loudspeaker respectively. The utility model adopts three loudspeaker units of high-frequency, mid-frequency and low-frequency, and is concentrically sleeved from inside to outside. The tweeter unit selects dome diaphragm, and directivity is accurate and high-frequency extension performance is superior. The midrange unit is equipped with annular diaphragm, effectively suppresses segmented vibration, and ensures the intelligibility and purity of mid-frequency tone color. The woofer unit also adopts annular diaphragm, which can maximize the effective radiation area in limited space.

The invention discloses a splicing method for maximizing an InSAR main and auxiliary SLC image interference region, and belongs to the technical field of remote sensing data processing. Comprising the steps of 1, determining a working area and an overlapping area; and 2, correcting the consistency of the phase and the amplitude of the main image. And step 3, main image overlapping region registration is carried out, and a pixel-level geometric corresponding relation is established. And 4, resampling and splicing the main image to obtain a spliced main SLC image. And 5, registering the auxiliary image and the spliced main image. And step 6, re-sampling and splicing the auxiliary image to generate a spliced auxiliary SLC image. According to the method, on the premise of keeping consistency of phase information and amplitude information, the effective coverage area after main / auxiliary splicing is maximized, and seamless splicing of the main / auxiliary SLC images is achieved; the obtained splicing result is natural in strip transition, high in geometric consistency and good in coherence, the precision and robustness of subsequent interference processing and time sequence deformation inversion can be remarkably improved, and the method is particularly suitable for large-range InSAR business production and high-quality splicing of complex scenes.

This application relates to the field of communication equipment technology, and in particular to a portable ultra-wideband antenna device for a four-in-one 5G backpack. It includes an antenna housing and a multi-in-one connector disposed within the antenna housing. The multi-in-one connector also electrically connects to a radio frequency (RF) connector. An antenna radiating element group is located inside the antenna housing and electrically connected to the RF connector. The antenna radiating element group includes a first antenna, a second antenna, a third antenna, and a fourth antenna arranged sequentially at intervals along the vertical direction of the antenna housing. In this application, the multi-in-one connector integrates the feed lines of the four antenna elements onto a single interface, simplifying the connection to the RF connector and achieving a compact structure. It integrates four independent antenna systems into a lightweight fiberglass rod, avoiding the cumbersome and bulky nature of externally mounted multiple antennas, perfectly meeting the operational or emergency needs of individual soldiers carrying and moving quickly.