Method and a measuring device for measuring broadband measurement signals

Patent metadata

Field	Value
Publication number	US-10088554-B2
Application number	US-201414787268-A
Country	US
Kind code	B2
Filing date	Apr 22, 2014
Priority date	Apr 24, 2013
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

The invention relates to a method for determining a deviation of a broadband measurement signal from a reference signal. The method provides the steps: subdivision of the signal into at least two measurement-signal frequency bands; displacement of the measurement-signal frequency bands; and reconstruction of the at least two measurement-signal frequency bands. A corresponding measurement device is also contained within the idea of the invention.

First claim

The invention claimed is:

1. A method for determining a deviation of a broadband measurement signal from a reference signal, comprising:
subdividing, by a signal subdividing circuit, the broadband measurement signal into at least two subband measurement signals;
displacing, by a signal alignment circuit, the at least two subband measurement signals to correspond with respective frequency bands of the reference signal, wherein the displacement is performed with the use of an external trigger signal; and
reconstructing, by a signal reconstruction circuit, the at least two subband measurement signals to form a reconstructed broadband measurement signal.

2. The method according to claim 1 , wherein the broadband measurement signal is a periodic frequency-modulated signal, and wherein a period of the signal is at least partially linear-frequency-modulated.

3. The method according to claim 1 , further comprising one or more of the steps of:
subtracting the reference signal from the reconstructed broadband measurement signal; and
displaying the reconstructed broadband measurement signal with the reference signal.

4. The method according to claim 1 , wherein the displacement step comprises correlating the subband measurement signals with the reference signal.

5. The method according to claim 1 , wherein the displacement step is implemented with the use of a carrier signal.

6. The method according to claim 1 , wherein the reconstruction step comprises adding the displaced subband measurement signals.

7. The method according to claim 1 , wherein the displacement step is implemented within a frequency-modulation domain of the subband measurement signals.

8. The method according to claim 7 , further comprising:
demodulating the broadband measurement signal divided into the at least two subband measurement signals.

9. The method according to claim 1 , wherein the displacement step is implemented in an I/Q baseband of the subband measurement signals.

10. The method according to claim 9 , wherein the reconstruction step comprises:
time displacing each of the subband measurement signals by a time offset of the measurement signal corresponding to the reference signal;
mixing each of the time-displaced subband measurement signals with a frequency-band carrier corresponding to the reference signal frequency band;
adding the mixed subband measurement signals; and
demodulating the mixed subband measurement signals to form a reconstructed broadband measurement signal.

11. The method according to claim 1 , further comprising:
performing a measurement-error correction of a deviation error after the reconstruction step.

12. A measuring device for the analysis of a broadband measurement signal, comprising:
a signal subdividing component configured to subdivide the broadband measurement signal into at least two subband measurement signals, wherein each subband measurement signal comprises an I/Q baseband signal;
a signal displacing component configured to displace each of the subband measurement signals relative to corresponding reference-signal frequency bands of a reference signal, wherein the displacement is performed with the use of an external trigger signal;
a signal reconstructing component configured to reconstruct the displaced subband measurement signals to form a reconstructed broadband measurement signal; and
a signal analysis component configured to analyze the reconstructed broadband measurement signal relative to the reference signal, wherein a deviation of the reconstructed broadband measurement signal relative to the reference signal is provided as a starting value for the measuring device at which a period of the measurement signal begins.

13. The measuring device according to claim 12 , further comprising:
a processor component configured to determine a number of measurement-signal frequency bands dependent upon the bandwidth of the received measurement signal, and to increase the number of measurement-signal frequency bands with increasing bandwidth.

14. The measuring device according to any one of claim 12 , further comprising:
a selection component configured to select a measurement period length of the broadband measurement signal.

15. The measuring device according to claim 12 , further comprising:
a noise reduction component configured to filter and/or average the reconstructed broadband measurement signal in order to reduce background noise of the measuring device.

Assignees

• Rohde & Schwarz

Inventors

• Cirillo Luke
• Lagler Andreas

Classifications

• G01S7/4008 Primary

  of transmitters · CPC title

• G01S13/343

  using sawtooth modulation · CPC title

• G01S13/0209

  Systems with very large relative bandwidth, i.e. larger than 10 %, e.g. baseband, pulse, carrier-free, ultrawideband · CPC title

• G01R23/20 Primary

  Measurement of non-linear distortion · CPC title

• G01S2007/358

  Physics · mapped topic