雷達(dá)新技術(shù)ppt課件(編輯修改稿)
2025-06-01 07:08 本頁面
【文章內(nèi)容簡介】 rthogonal polarizations, but no alternate transmission of orthogonal ponents. Such a system transmits only a single elliptical orcircular polarization and then can receive copolar and crosspolar ponents with dual receivers). ?We will focus primarily on polarization agile radar systems. Polarization Agility –Transmitted Waveform Schematic Simplified Block Diagram of Polarization Agile Radar Systems in Linear (H: Horizontal, V: Vertical) Polarization Basis Transmit ? TRANSMIT SIDE Simplified Block Diagram of Polarization Agile Radar Systems in Linear (H: Horizontal, V: Vertical) Polarization Basis –Receive ? RECEIVE SIDE Assuming linear polarization basis and dual Receiver (., Spol, CHILL) Polarization or Waveguide Switch To Switch or Not to Switch ?Critical that switch isolate the H and V transmit/receive powers. –Ferrite switches are not as robust, in this regard, as rotary switches. –Further, Ferrite switches experience a larger power insertion loss, the loss is not uniform between transmit and receive modes, and theyare very sensitive to temperature fluctuations. ?For high quality crosspolar measurements (., measuring depolarization) need an H/V or crosspolar isolation of at least30 dB (even lower if possible。 35 dB to 45 dB of isolation is preferable for effective hydrometeor identification). –A single ferrite switch typically provides ~ 20 to 25 dB of isolation (binations of ferrite switches can reduce the isolation, but the insertion losses are markedly increase). –Mechanical switch such as SPOL provides 47 dB of isolation –Dual transmit system such as the CSUCHILL does not use a switch and attains very low isolation (better t
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