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At this pulse compression method the transmitting pulse has a linear FM waveform. This has the advantage that the wiring still can relatively be kept simple. However, the linear frequency modulation has the disadvantage that jamming signals can be produced relatively easily by so-called „Sweeper”.
The block diagram on the picture illustrates, in more detail, the principles of a pulse compression filter.
The compression filter are simply dispersive delay lines with a delay, which is a linear function of the frequency. The compression filter allows the end of the pulse to „catch up” to the beginning, and produces a narrower output pulse with a higher amplitude.
As an example of an application of the pulse compression with linear FM waveform the RRP-117 can be mentioned.
Filters for linear FM pulse compression radars are now based on two main types.
- Digital processing (following of the A/D- conversion).
- Surface acoustic wave devices.
출처 : http://www.radartutorial.eu/08.transmitters/tx17.en.html
