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
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[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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