The sixth sentence is eliminated the ambiguity error.
When the process is finished for all the subimages, (13) corrects the ambiguity error.
Caption: Figure 5: FSD-HSO algorithm applied to demodulate synthetic and real interferograms: (a) normalized interferograms; (b) direct phases of interferograms; (c-d) calculated frequencies along (x, y) axis, respectively; (e) demodulated phases with ambiguity errors; and (f) correct demodulated phases without ambiguity error.
An ambiguity error occurs when adjacent correlators fail to track within the phase margin.
The phase errors in the other correlators will have no effect unless the phase margin is exceeded, producing an ambiguity error.
This set-up provides a phase margin of [+/-] 45 [degrees], allowing any or all correlator phases to be randomly in error by 45 [degrees] without producing an ambiguity error.
A measure of "goodness" in an IFM receiver is the phase margin, which is an expression of the magnitude of phase errors allowed in the correlators before an ambiguity error would result.
In consequence, rather than observe just a 3 dB difference in the ambiguity error threshold between the two designs, the difference usually appears as 6 or 7 dB.
Delay line ratios of 2:1 provide the phase margins necessary for minimizing frequency ambiguity errors
The added phase margin allows for operation at 3 dB SNR with an RMS frequency accuracy of 1 MHz with no ambiguity errors
When measuring the frequency of a spread spectrum signal, the IFM will exhibit two types of errors, least significant bits (LSB) errors and ambiguity errors.
If the error exceeds the margin, ambiguity errors will occur.