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A Broadband Delay Synthetic Measurement Method

A comprehensive measurement and delay technology, applied in the field of communication, can solve the problems of accurate measurement of broadband delay and limited sampling frequency of data acquisition system, etc., to achieve the effect of measuring system delay, improving measurement accuracy, and accurate system delay

Inactive Publication Date: 2016-05-04
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

Usually, the highest point of the broadband pulse compression signal envelope is used as the position estimation of the signal, but due to the limited sampling frequency of the data acquisition system, it has a certain influence on the accurate measurement of the broadband time delay, and the measurement accuracy of the delay is the time sampling accuracy

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  • A Broadband Delay Synthetic Measurement Method

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Embodiment Construction

[0015] The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] Such as figure 1 As shown, the figure is a schematic diagram of the waveform of the peak part of the main lobe after the pulse compression of the broadband linear FM signal. If the time delay is an integer period, the obtained sampling value should be the value corresponding to points 1, 9, and 17, the maximum sampling value should be 9, and the next largest sampling value should be 1 or 17; if the time delay is 1 / 4 period, The obtained sampling value is the value corresponding to 3 and 11; if the delay is 2 / 4 cycle, the obtained sampling value is 5 and the value corresponding to 13; if the delay is 3 / 4 cycle, the obtained sampling value is 7 , the value corresponding to 15. After obtaining the maximum value and the second maximum value of the peak value after pulse compression, it can be seen from ...

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Abstract

The invention discloses a wide-band time delay comprehensive measurement method, adopting a linear frequency modulation signal as a time delay measurement signal; using a high sampling rate to establish a comparison data table, the higher the sampling rate, the finer the established data table and the better the estimation of the peak value Accurate, considering the impact of system noise on the signal amplitude and the needs of practical applications, the sampling rate is selected to be 8 times the actual sampling rate, or higher. It is a method for estimating a more accurate time delay based on a waveform comparison lookup table, and can more accurately measure the echo time delay of a broadband system.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to a comprehensive measurement method of broadband time delay. Background technique [0002] In the narrowband mode, the traditional time delay measurement mostly uses the point frequency signal of the center frequency as the test signal, but for the broadband signal, the characteristics of the center frequency can hardly replace the characteristics of the entire frequency band, so the broadband signal is used as the channel test signal. Usually, the highest point of the broadband pulse compression signal envelope is used as the position estimation of the signal. However, due to the limited sampling frequency of the data acquisition system, it has a certain influence on the accurate measurement of the broadband time delay. The measurement accuracy of the delay is the time sampling accuracy. If the sampling time interval is 4ns, the measurement accuracy of the time delay is also ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/40
Inventor 于雪莲周云崔明雷汪学刚邹林
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA