Publications

Abstract not provided.

A Synthetic Aperture Radar (SAR) which employs direct IF sampling can significantly reduce the complexity of the analog electronics prior to the analog-to-digital converter (ADC). For relatively high frequency IF bands, a wide-bandwidth track-and-hold amplifier (THA) is required prior to the ADC. The THA functions primarily as a means of converting, through bandpass sampling, the IF signal to a baseband signal which can be sampled by the ADC. For a wide-band, high dynamic-range receiver system, such as a SAR receiver, stringent performance requirements are placed on the THA. We first measure the THA parameters such as gain, gain compression, third-order intercept (TOI), signal-to-noise ratio (SNR), spurious-free dynamic-range (SFDR), noise figure (NF), and phase noise. The results are then analyzed in terms of their respective impact on the overall performance of the SAR. The specific THA under consideration is the Rockwell Scientific RTH010.

A Seismic Signal Modeling software package has been implemented for the RSTN and the NORESS/ARCESS data. The key features of the software are: (1) It removes over a limited band the gain and phase effects that were introduced by the seismometer and its associated filters. This removal was accomplished by using Finite Impulse Response (FIR) filter techniques to produce a resulting signal in terms of either ground-motion velocity or displacement. (2) It combines two separate bands of data, which are sampled at different rates, into a single broadband signal. (3) It produces a time-domain plot of the signals. (4) It produces a spectral analysis of the signals, including signal-to-noise ratio and comparison of the signals. 5 refs., 22 figs., 3 tabs.