31results about How to "Facilitate signal acquisition" patented technology

One embodiment of the invention provides a receiver for use in a navigation system comprising multiple transmitters. Each transmitter transmits a positioning signal comprising a pseudo-random noise (PRN) sequence corresponding to the respective transmitter. The receiver comprises a code module for supplying multiple PRN sequences corresponding to the respective multiple transmitters; and a correlator for correlating the PRN sequences supplied by the code module with an incoming signal. The multiple PRN sequences are based on a single Sidelnikov / Lempel / Cohn / Eastman (SLCE) generative sequence uSLCE, and each of said multiple PRN sequences, denoted ui satisfies the equation: ui=uSLCE⊕TiuSLCE, where ⊕ indicates element by element binary XOR addition, and Ti indicates a cyclic shift of i chips.

The invention relates to a sensor module for monitoring bearings in steel industry applications comprising an embedded portion (12a) for being fitted into a hole (22) in a bearing component (10) of the bearing to be monitored, wherein the embedded portion (12a) comprises at least one sensor (34a, 34b, 36, 38). It is proposed that the embedded portion (12a) further comprises a clamping mechanism (30) generating clamping force acting on at least two opposing lateral internal faces of the hole (22).

The invention discloses a digital passive infrared static human body detector which comprises an outer shell, a microcontroller and a PIR sensor and is characterized in that a Fresnel lens is arranged at the front end of the PIR sensor, a matched reflector is installed between the PIR sensor and the Fresnel lens, and the microcontroller is connected with a power source module, a drive motor and a detection switch. A detection method includes: a, background noise is learned, and a background noise sequence is formed; b, dynamic human body detection is carried out; c, delayed output is carried out; d, static detection is judged whether to be carried out or not; e, detection signals are acquired, and a detection signal sequence is formed; f, the digital mutual correlation calculation is carried out; and g, a static human body is judged whether to exist or not. According to the detector and the method, false assumption of a prior passive static human body detector and the defect that the human body under the static state can not be detected are abandoned and avoided, and the human body under the static state in a detection area can be effectively and accurately detected so that the static detection is achieved.

The invention relates to a biomedical electrode, in particular to a biomedical electrode with a surface micro-structure array and a manufacturing method thereof. The biomedical electrode with the surface micro-structure array characteristic comprises a metal electrode core, a foam materiel back lining and a shielded conductor; the manufacturing method of the biomedical electrode comprises the steps as follows: sheet metal serves as the raw material of the metal electrode core, a laser micro-processing technology is adopted to form a micro-structure array with the longitudinal distance of 0.1-0.3 mm and the transverse distance of 0.1-0.3 mm on the metal electrode core, cleaning and drying are performed, then hydrochloric acid is utilized to remove an oxidizing layer and impurities, alcohol is utilized for cleaning, and a Au or Ag / AgCl thin layer is plated on the surface of the metal electrode core; the metal electrode core is stuck to the surface of the foam materiel back lining by glue; the shielded conductor penetrates through the foam materiel back lining, and is connected to the surface of the metal electrode core with the method of filling conductive silver adhesive, and solderless connection of the metal electrode core with the shielded conductor can be formed after the conductive silver adhesive is solidified, so that the biomedical electrode with the surface micro-structure array is obtained.

The invention belongs to the technical field of non-destructive testing, and specifically discloses a carrier-type pulsed eddy current detection method and device. Firstly, a metal plate is installed under the pulsed eddy current sensor, and a square wave excitation is applied to the pulsed eddy current sensor to detect the reduction of the square wave excitation. The attenuation curve of the induced voltage in the pulsed eddy current sensor with time, that is, the carrier signal; then place the metal piece to be tested under the pulsed eddy current sensor with the metal plate installed, and apply square wave excitation to the pulsed eddy current sensor to detect the reduction of the square wave excitation. The attenuation curve of the induced voltage over time in the hourly pulse eddy current sensor, that is, the modulation signal; the original pulse eddy current detection signal of the metal part to be tested is obtained by demodulating the carrier signal and the modulation signal, which solves the problem of pulse eddy current detection of metal components such as thin plates and small-diameter tubes The problem of fast signal attenuation and difficulty in effective acquisition expands the scope of application of pulsed eddy current testing.

The invention discloses a shock monitoring and positioning method based on two-dimensional beam focusing theory, which specifically includes the following steps: step 1, using a piezoelectric sensor to monitor the signal when the structure is struck, and using a data acquisition card to collect the shock signal Send it to the host computer, perform Fourier transform on the impact signal in the host computer to obtain the signal spectrum, select the frequency peak of the spectrum as the center frequency to perform wavelet analysis on the signal, obtain the time domain signal corresponding to the center frequency, and analyze the obtained time domain Signal envelope; step 2, use the two-dimensional beam focusing positioning method to find the location of the impact point, and determine whether it is in the outer field; step 3, if the positioning coordinates are not in the outer field, consider that the positioning result is located in the inner field two-dimensional beam focusing positioning In the blind area of ​​the method, the positioning coordinates (a, b) are recalculated and output as the final positioning result. The invention solves the problems of positioning blind area and relatively low positioning accuracy existing in the existing one-dimensional beam focusing positioning.

The method comprises: extracting the singular point and singular value from the observed signal g(x); using the singular point and singular value to construct the relevant singular function; using the frequency spectrum zero-setting threshold preset by the system to construct the noise-removing function and permutation function; according to said result, using the reconstructed signal substitution method to get the noise-removed signals.