Digital correlator testing system and method

A digital correlator and test system technology, applied in the direction of instruments, measuring electronics, measuring devices, etc., can solve the problems of unstable output, large link coupling, and low test accuracy

Active Publication Date: 2018-03-09
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

[0013] The technical problem solved by the present invention is to overcome the deficiencies of the prior art and propose a digital correlator testing system and method, which can effectively solve the problems of low testing

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  • Digital correlator testing system and method
  • Digital correlator testing system and method

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Experimental program
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Embodiment

[0084]The tested digital correlator is the principle prototype of the synthetic aperture microwave radiometer digital correlator. The digital correlator has 16 acquisition channels, the input signal center frequency is 75MHz, the bandwidth is 20MHz, and the input power range of each channel is -20dBm~5dBm , the integration time of auto-correlation processing and cross-correlation processing is 1 second. The digital correlator index requires that its correlation accuracy error be within 0.0003, and its phase error be within 0.5°. At present, traditional testing methods are difficult to meet its testing requirements.

[0085] In the digital correlator test system, noise source 1 and noise source 2 used are incoherent noise signals, which are both amplified and filtered by noise diodes. The output signal is Gaussian white noise band-limited signal, and the center frequency of the output signal is f=1415MHz , the bandwidth B=20MHz, satisfying the requirement of f≥20B.

[0086] Th...

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Abstract

The invention relates to a digital correlator testing system and method, and belongs to the space microwave remote sensing technical field; the system and method firstly shunt, amplify, filter and phase shift a high frequency signal source, then carry out signal down conversion to needed intermediate frequency, and finally amplify and output in a combined path; the output signal frequency and thesignal source frequency are different, and segmented amplification is employed, thus effectively preventing inter-channel crosstalk and amplifier self excitation conditions, and greatly improving theoutput signal stability. The noise signal phase shift operations of the method are carried out in the high frequency band, thus reducing the signal bandwidth frequency ratio (B/f<<0.05), effectively eliminating the correlation noise signal decorrelation effect, and greatly improving the output signal correlation precision; the method is suitable for all digital correlator tests.

Description

technical field [0001] The invention relates to a testing system and method of a digital correlator, belonging to the technical field of space microwave remote sensing. Background technique [0002] The digital correlator is the key single unit in the synthetic aperture radiometer system. Its main function is to perform synchronous acquisition and pairwise correlation processing on the intermediate frequency signals output by multiple receiving channels, so as to obtain the correlation value and phase difference of any two intermediate frequency signals. Therefore, in the development process of the digital correlator, it is particularly important to test its correlation accuracy and phase detection accuracy. [0003] Traditional testing typically employs methods such as arbitrary waveform generators or direct-related noise synthesis. [0004] The arbitrary waveform generator uses software to generate the required digital waveform and imports it into the memory, and then use...

Claims

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Application Information

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IPC IPC(8): G01R31/00
Inventor 宋广南李一楠卢海梁胡泰洋李鹏飞杨小娇何征吕容川王佳坤
Owner XIAN INSTITUE OF SPACE RADIO TECH
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