High sampling rate equivalent sampling method and system based on frequency difference method and dds
An equivalent sampling, high sampling rate technology, applied in the direction of logic circuit coupling/interface, logic circuit connection/interface layout using field effect transistors, etc., can solve the problem of low delay accuracy, achieve high frequency resolution, improve Equivalent sampling rate, the effect of reducing system complexity
Active Publication Date: 2017-09-29
NORTHWEST INST OF NUCLEAR TECH
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Problems solved by technology
The adoption of this method solves the problem that the existing time-domain method requires a delay system and the delay accuracy is not high, reduces the system complexity, and improves the system stability; the present invention solves the problem that the frequency difference method needs high precision The problem of the signal frequency measurement module solves the signal jitter introduced by the spurious frequency of the frequency step method and greatly improves the equivalent sampling rate of the system
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[0045] The present invention is used to realize the equivalent high sampling rate, and the equivalent sampling method can be widely used in various types of radars, such as wall-penetrating radars and anti-collision radars that use periodic pulse signals as measurement carriers, and periodic continuous wave signals Ground penetrating radar, time domain reflectometer, etc. as measurement carriers.
[0046] see figure 1 , the system mainly includes a clock reference module U1, a signal generation module U2, an input and output module U3, a data acquisition module U4, a data processing module U5, a control module U6, and a module to be tested U7.
[0047] The control module U6 controls the two output signals of the signal generation module U2, controls the data processing module U5, arranges the sampled data, restores the waveform of the signal to be sampled with time expansion, and deduces the property of the module U7 to be tested according to the waveform.
[0048] The signal...
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An equivalent sampling method and system. The method is based on the principle of the frequency difference method. After processing two signals generated on the same frequency reference, one is used as a sampling clock signal, and the other is used as a signal to be sampled. The frequency difference between the two signals can be very small, and each cycle of the signal to be sampled is sampled once, and the complete and time-expanded signal waveform to be sampled is obtained through multiple sequential sampling, realizing sequential equivalent sampling; it is also possible to make the two signals The frequency has a multiple relationship. Each period of the signal to be sampled is sampled multiple times, and then the sampled data is arranged and combined to restore the time-stretched signal waveform to be sampled. While realizing pseudo-random equivalent sampling, the equivalent sampling time is reduced. The present invention can be widely used in wall-penetrating radars, anti-collision radars, etc. that use periodic pulse signals as measurement carriers, and ground-penetrating radars, time-domain reflectors, etc. that use periodic continuous wave signals as measurement carriers.
Description
technical field [0001] The present invention relates to a high sampling rate equivalent sampling method and system based on the frequency difference method and DDS (Direct Digital Frequency Synthesis), specifically, a method for equivalent sampling of periodic signals is designed methods and systems. This method is suitable for equivalent sampling of periodic signals. Background technique [0002] There are usually two methods for data acquisition of signal waveforms: real-time sampling and equivalent sampling; among them, equivalent sampling is divided into three types, sequential equivalent sampling, pseudo-random equivalent sampling and random equivalent sampling, among which pseudo-random Equivalent sampling can be seen as an improved sequential equivalent sampling. [0003] The current sequential equivalent sampling method can be divided into two implementation methods, one is a time domain method, and the other is a frequency domain method. Time-domain implementatio...
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IPC IPC(8): H03K19/0185
Inventor 李海涛阮林波田耕田晓霞张雁霞渠红光李显宝王晶
Owner NORTHWEST INST OF NUCLEAR TECH