Da Inglese a Italiano Tecnico/Meccanico Ingegneria (generale)

Come tradurreste " "early" signal"?

"Advantageously therefore, for the demodulation of BOC modulated signals an embodiment of the invention has a chip matched filter, having an impulse response in the form of a single BOC chip. For a given desired signal (e.g. an "Early" signal), outputs of the CMF are then used to produce a correlation signal as previously described. The result of this is a complex value."

"In GNSS systems the tracking is commonly performed by using multiple correlations, one of which is a "Prompt" correlation in which the timing of the reference signal is adjusted to equal the current estimate of the arrival time of the signal, and others may be an "Early" correlation in which the timing of the reference signal is adjusted to be earlier than the current estimate of the arrival time of the signal and a "Late" correlation in which the timing of the reference signal is adjusted to be later than the current estimate of the arrival time of the signal."

"Figure 2 shows simulated processed outputs of a correlator providing Early, Prompt and Late outputs. Figure 2a plots the correlation peak of a correlator output of an idealised analogue system, having square chips, as a function of signal input delay. This has a triangular shape over the particular time span shown. Superimposed on the plot are the outputs from the Early, Prompt, and Late gates. Early is shown as a down-pointing triangle, Prompt a circle and Late an up-pointing triangle, for three cases. The markers suffixed 1 indicate the outputs in the first case, where the receiver’s estimate of the peak time is correct."


Qui "early" compare varie volte:

"By suitable processing of the Early, Prompt and Late outputs, a "discriminator" function may be produced which, in this ideal case, is a linear monotonic signal across the duration of a single chip. This is shown in Figure 2b. This is an idealised representation as generated by the equation (Early-Late)/(2xPrompt +Early +Late), where Early is © chip in advance of the reference point, Late is © chip behind the reference point, and Prompt is at the reference point. The graph is plotted as a function of the time of arrival estimate error, in chips. As is well known, other discriminator functions may be used, such as the equation (Early-Late)/(Early +Late), which is simpler to compute but gives a slightly noisier result."

Grazie!