System Calibration Fernando Rodriguez-Morales August 7 th, 2007

2 of 9 Outline Overview Network analyzer measurements –Calibrated delay –Antennas Delay-line response Other measurements

3 of 9 Calibration overview –Transmitter/receiver transfer function is determined –Antenna response is determined. Calibration is used to remove systematic errors from the measured data. Calibrated delay

4 of 9 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.

5 of 9 Network Analyzer Measurements The VNA is also used to determine the transmission coefficient of the antennas (from the reflection coefficient). Computer Left antennas Right antennas

6 of 9 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.

7 of 9 Delay line measurements Delay line setup Sample waveforms

8 of 9 Other Measurements Fly over the ocean (or smooth surface) to collect data over a distance of km. Roll measurements to determine antenna patterns.

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