High-speed high-accuracy recorder and sampling data automatic-correction and high-order matching method thereof

Abstract

The invention discloses a high-speed high-accuracy recorder and a designing method thereof. The high-speed high-accuracy recorder comprises a signal conditioning module, four analogue-to-digital converter (ADC) modules, four first in first out (FIFO) modules, two synchronous dynamic random access memory (SDRAM) modules, a client-server architecture control module, a synchronous coherent clock module, a high-accuracy reference voltage source module and the like, wherein the client-server architecture control module consists of an advanced RISC machine (ARM) unit and a field programmable gate array (FPGA) unit; and the synchronous coherent clock module takes a clock chip as a core. The recorder finishes the operations of 'time-interleaved' sampling, encapsulation, caching, transmission, decapsulation combination, correction, storage, uploading and the like concurrently under the control of a concurrent time sequence logic, corrects sampling data based on an inter-ADC channel mismatchingautomatic-correction polynomial to reduce gain mismatching and offset / zero mismatching among ADC channels, reduces time mismatching among the ADC channels by using a synchronous coherent clock and a serpentine curve wire-length fine-adjustment technology, and solves the problems of associated global errors produced by data loss in the high-speed 'time-interleaved' sampling by using a high-order matching technology in which the encapsulation is performed by additional timestamp sequence numbers.

Description

technical field [0001] The invention relates to the technical category of recorders for signal sampling and storage, in particular to a high-speed and high-precision recorder and its sampling data self-calibration and high-level matching methods. Background technique [0002] Generally, a sampling rate below 10KSPS (Kilo_Samples Per Second) is called a low-speed data sampling recorder; 10KSPS ~ 10MSPS is a medium speed, and 10MSPS ~ 100MSPS is a high speed. High-speed data sampling recorder is widely used in radar, missile, communication, sonar, remote sensing, geological exploration, vibration engineering, non-destructive testing, intelligent instrument, voice processing, laser Doppler velocity measurement, optical time domain reflection measurement, material spectroscopy and Spectrum measurement, biomedical engineering and other fields; the companies that develop and produce high-speed recorders include: SEAKR ENGINEERING, Inc., Ray-theon, Inc., TEACAmerica, Inc. in the Un...

AI Technical Summary

Problems solved by technology

The exploration around AFB is beneficial, but there are considerable limitations: First, AFB is essentially a method of after-the-fact remedy, because the mismatch between ADC channels causes the distortion of the sampled data of the recorder, and then AFB corrects the already The distorted data is filtered; secondly, the AFB is designed based on the spectral distribution characteristics of the mismatch between channels under certain assumptions, and there are considerable limitations; finally, the filtering of the distorted data by the filter comes at a cost - loss The effective information (sometimes even crucial details) contained in the sampled data, the AFB filter is no exception, and it is unique--while filtering out the distortion caused by the mismatch between channels, the sampled data is more or less lost. valid information

[0007] It must be pointed out that "time cross-sampling" needs to sequentially recombine the sampling data of multiple low-speed ADC chips; and in the process of high-speed sampling, processing, and storage of signals, the loss of A / D data cannot be completely ruled out so far.

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