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Polarimetric Solid State Radar Design for CASA Student Test Bed

Polarimetric Solid State Radar Design for CASA Student Test Bed. Alexandra Litchfield. Objective. To design a Dual Polarimetric Solid State Doppler Radar for the CASA student Test Bed. Possible Radar Localization @ Aguadilla, PR. Possible Radar Localization @ Mayaguez, PR. Definition:

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Polarimetric Solid State Radar Design for CASA Student Test Bed

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  1. Polarimetric Solid State Radar Design for CASA Student Test Bed Alexandra Litchfield

  2. Objective • To design a Dual Polarimetric Solid State Doppler Radar for the CASA student Test Bed.

  3. Possible Radar Localization @ Aguadilla, PR

  4. Possible Radar Localization @ Mayaguez, PR

  5. Definition: Solid State Devices and Systems are based entirely on semiconductor. There is no mechanical action on a solid state device but electromagnetic action takes place. Current is confined to solid elements. Advantages: Does not need a high voltage modulator. Use less power (kW from Magnetron are eliminated) Coherent radars can be made. Pulse Compression can be used. Why Solid Sate

  6. Radar Requirements • Radar Freq: 9.5-9.6 GHz (X Band) • Peak Transmitter Power: 25W • Minimum Detectable Signal Power: -100dBm • Antenna Gain: 12dB • Horizontal Antenna Beam Width: 6 degrees • Vertical Antenna Beam Width: 6 degrees • Pulse Width: 30us • Max Range: 6km

  7. Project Phases • Radar Front End • TR Module • Transmit/Receive Module Circuit Design • Component Layouts • Build and Test • Phase shifter • Phase shifter circuit design • Component Layouts • Build and Test • Master clock distribution • Digital Signal Processing • Antenna Implementation • Integration

  8. TR Original Preliminary Design Transmit Path PA Directional Coupler Circ. IF Limiter OSC S Power Combiner Receiver Path LNA Calibration Path IF

  9. Preliminary Design for Radar Front End Power Combiner RF PA S Cal PreA LNA Tx Rx LO Phase shifter Phase shifter Ø Ø IF Divider / Combiner Rx Tx

  10. Phase Shifter Preliminary Design 90 Hybrid Variable Amp. 90 Hybrid ∑ ∑ I Q 90 Hybrid Ø Q I

  11. Vcc2 Tx IF2 I Design with Vector Modulator Phase Shifter Vector Mod IF2 RF Directional Coupler PA Circ. Q Vcc1 LO2 Limiter IF2 Q Power Combiner 20MHz Noise I Rx LO1 LNA IF LO2 Vector Mod Vcc1 Vcc2 20MHz LO1 IF1 IF1 I Q

  12. Directional Coupler Limiter LNA LO1 IF1 IF1 One Polarization Channel Circ. Cal Path Receive Path Transmit Path Power Combiner PA Noise LO2 Vcc2 Vector Mod IF2 Phase shifter LO1 Vcc1

  13. Mixer: Alters the carrier frequency of the signal. Oscillator: Controls the frequency used to sincronized the radar. Directional Coupler / Power Divider: Couples part of the transmision power in to the transmision line. Limiter: Circuit that allows to pass the unaffected received signal Low Noise Amplifier (LNA): Amplifies weak signals captured by the antenna. Circulator: Redirect signal that comes in an out from/to transmisor and receptor. Components

  14. Dual polarization Antenna Operating at 9.5GHz Array of Apertured Coupled Antennas Radar’s Dual Polarized Antenna

  15. G=16dB; Ganancia R=6km; Maximum Range C=3x10^8 m/s; velocity of light Pt=2W Power Transmitted by each channel. H=30usec; Pulse Width F= 9.5 GHz Lambda=c/f =.031579 K=dielectric factor (.93 for water) Z=10dBz; 10=10log(P), P=10 MDS = -100dBm N=2.66x10^9 G=39.81W Pr=1uW=-30dBm Received Power Calculations

  16. Component Layout Power Amplifier Low Noise Amplifier HMC48LP5 HMC564LC4

  17. Component Layout Mixer HMC412M58G

  18. Future Work • To construct and measure parameters for the TR Module and Phase Shifter. • Digital Signal Processing. • Antenna Implementation • Integration • Test and Measure

  19. Questions

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