This thesis explores the performance of a low-cost, portable vector network analyzer modified for use in measuring the thickness of ice sheets. These measurements are instrumental in determining how quickly ice is melting in regions such as the polar ice caps. The harsh operating conditions of this application generally require temperature-controlled housings to maintain suitable operation. An alternative approach is to modify the internal oscillator to make it temperature insensitive and ultimately improve the accuracy of the measurement.
To determine the effectiveness of a network analyzer, a relationship between the frequency stability of the oscillator and the resolution is derived. Thermal testing of frequency stability is performed on the proposed network analyzer, revealing that the original oscillator is not suitable for this application. A replacement oscillator is selected, installed, and thermally tested for improvements. Ultimately, this modified network analyzer meets the requirements for ice sheet measurements using ice penetrating radar.
