System%20Calibration

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System Calibration

• Fernando Rodriguez-Morales
• August 7th, 2007

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Outline

• Overview
• Network analyzer measurements
• Calibrated delay
• Antennas
• Delay-line response
• Other measurements

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Calibration overview

• Transmitter/receiver transfer function is
  determined
• Antenna response is determined.

Calibrated delay
Calibration is used to remove systematic errors
from the measured data.
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Network Analyzer Measurements

• Used to determine the transfer function of a
  calibrated delay.
• S-parameter files are downloaded and stored in a
  computer.
• Phase and amplitude information available.

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Network Analyzer Measurements

• The VNA is also used to determine the
  transmission coefficient of the antennas (from
  the reflection coefficient).

Computer
Right antennas
Left antennas
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Delay line measurements

• Performed to compensate for amplitude and phase
  differences in the system.
• Transmit/record waveforms for different
  bandwidths and pulse durations.
• System response (including power amplifiers) can
  be determined.

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Delay line measurements
Delay line setup
Sample waveforms
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Other Measurements

• Fly over the ocean (or smooth surface) to collect
  data over a distance of 10-20 km.
• Roll measurements to determine antenna patterns.

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