Exemplos de uso de Pulse compression em Inglês e suas traduções para o Português
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Pulse compression with linear FM waveform.
The procedure for this is called pulse compression.
Pulse compression with non-linear FM waveform.
Figure 8: diagram of a phase-coded pulse compression.
Filters for linear FM pulse compression radars are now based on two main types.
These two frequencies are linear FM- modulated for the pulse compression.
At this pulse compression method the transmitting pulse has a linear FM waveform.
The amount of noise is greatly reduced by the pulse compression filter therefore.
Pulse Compression technology provides high resolution while maximizing energy, to enhance detection and identification of targets.
But here it has to be said that the distance can only be measured after the pulse compression.
As an example of an application of the pulse compression with linear FM waveform can be mentioned the air defense radar AN/FPS-117.
The block diagram on the picture illustrates, in more detail,the principles of a pulse compression filter.
Pulse compression originated with the desire to amplify the transmitted impulse(peak) power by temporal compression. .
Since the spectra of the transmitted frequencies cover themselves in the pulse compression, other rules have to be considered.
In pulse compression, the energetic advantages of very long pulses with the benefits of very short pulses are combined.
This is an advantage for the frequency agility of the radar set anda requirement for frequency diversity and pulse compression.
In a pulse compression system, the range-resolution of the radar is given by the length of the pulse at the output-jack of the pulse compressing stage.
In addition to the susceptibility to interference, there are even more limitations to be accepted,e.g. this radar set cannot use pulse compression because its bandwidth is too low.
Thus, by the pulse compression can be achieved even then an output signal when the input signal is smaller than the noise floor and would be lost for a simple diode demodulation.
This term is described as time-bandwidth product of the modulated pulse andis equal to the Pulse Compression Gain, PCG, as the gain in SNR relative to an unmodulated pulse. .
Figure 1: Input andoutput signals of a pulse compression stage, the received signal in noise is hardly noticeable, so the pulse compression results in a clear echo signal.
Example given: the ATC-radar ASR-910 uses multiple frequencies,transmitting two pulses closely following the other(frequency diversity), and the RRP-117 air defense radar is also equipped with two frequency carriers and an additional pulse compression.
By this pulse compression method the radar don't need so high pulse power, therefore a good maximum range is obtained despite the lower pulse power limited by semiconductor amplifiers.
However, radars with longer waveforms suffer a relatively large minimum range,notably pulse compression radars, which can use pulse lengths of the order of tens or even hundreds of microseconds.
Pulse compression is a generic term that is used to describe a wave-shaping process that is produced as a propagating waveform is modified by the electrical network properties of the transmission line.
Through the use of pulse compression in conjunction with phase-coded transmitter signals, the system reaches sufficient range and signal quality for teaching and demonstration purposes, with a minimum(and for humans non dangerous) transmission power.
No pulse with compressions.
Weak femoral pulse with compressions.
Pulse cold compression therapy system.