Spectral Stitching Method to Increase Instantaneous Bandwidth in Vector Signal Analyzers

摘要

Various embodiments are described of devices and associated methods for processing a signal using a plurality of vector signal analyzers (VSAs). An input signal may be split and provided to a plurality of VSAs, each of which may process a respective frequency band of the signal, where the respective frequency bands have regions of overlap. Each VSA may adjust the gain and phase of its respective signal such that continuity of phase and magnitude is preserved through the regions of overlap. The correction of gain and phase may be accomplished by a complex multiply with a complex calibration constant. A complex calibration constant may be determined for each VSA by comparing the gain and phase of one or more calibration tones generated with each region of overlap, as measured by each of the VSAs.

主权项

1. A method for processing a received signal, the method comprising:
digitizing each of a plurality of component signals, each component signal comprising a respective frequency band of the received signal; frequency-shifting the component signals such that the respective frequency band of each component signal has a respective region of overlap with the frequency band of at least one other of the component signals; filtering the component signals such that the sum of the component signals has a unity frequency response within the regions of overlap; adjusting the gain and phase of the component signals such that the sum of the component signals has a continuous frequency response over an aggregate frequency band comprising each of the frequency-shifted frequency bands; and summing the component signals to obtain a composite signal; wherein said digitizing, frequency-shifting, filtering, and adjusting the gain and phase are performed for each component signal by a respective phase-locked, time-synchronized vector signal analyzer.