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Pulse Compressions

Pulse Compressions

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Ideally, if we wanted both long detection range and fine range resolution, we would transmit extremely narrow pulses of exceptionally high peak power. But there are practical limits on the level of peak power one can use. To obtain long detection ranges at PRFs low enough for pulse delay ranging, fairly wide pulses must be transmitted. One solution to this dilemma is pulse compression. That is, transmit internally modulated pulses of sufficient width to provide the necessary average power at a reasonable level of peak power; then, 'compress' the received echoes by decoding their modulation. This chapter explains the two most common methods of coding - linear frequency modulation and binary phase modulation. It also briefly describes a third method, polyphase modulation.

Chapter Contents:

  • Linear Frequency Modulation (Chirp)
  • Binary Phase Modulation

Inspec keywords: radar resolution; binary codes; echo; FM radar; phase modulation; modulation coding; pulse compression; linear codes; decoding

Other keywords: polyphase modulation; pulse delay ranging; modulation decoding; chirp; echo; linear frequency modulation; range resolution; binary phase modulation; modulated pulse transmission; pulse compression; detection range; PRF

Subjects: Radar equipment, systems and applications; Signal processing and detection; Modulation and coding methods; Electromagnetic compatibility and interference

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