A testing system and method for a digital correlator

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...

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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 accuracy, long testing time, and problems existing in existing testing methods. Unstable output, large link coupling, and unsuitable for correlator testing with relatively large input signal bandwidth and frequency (B / f≥0.05)

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