Digital pulse compression module

CI F06 Expander and Compressor

March 15

CI F06 Expander and Compressor Revision B2

3 / 9

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Pulse compressor channel description.

Input chirps are filtered (anti-aliasing filter), sampled and down-converted to baseband. I and Q baseband data

are processed by FIR filters whose coefficients are matched with the expander chirp characteristics. Digital

baseband I/Q compressed pulse is then up-converted to carrier frequency and converted into analog signal.

As inputs and outputs are IF analog signals, CI F06 is well suited to upgrade SAW based pulse compression

Radars. For better compatibility with old SAW based subsystems, an adjustable additional delay may be inserted.

Fig. 2 gives the maximum chirp duration value vs. bandwidth achievable for the compressor channel.

Compressor waveform is selected among 2 possible waveforms, using WFMSel_C input, as presented in Table 2.

Each time WFMSel_C signal changes, the new set of waveform coefficients will be active 50 µs later.

Table 2 : Compressor waveform selection

WFMSel_C

Compressor waveform

0

Waveform C0 (TBD)

1

Waveform C1 (TBD)

Fig. 2 : Accessible B x T area