Spatial Pulse Compression.
Abstract
The purpose of this experiment is to verify that the characteristics of a broadband antenna will cause it to function as a dispersive filter. A log-periodic type antenna with a bandpass from 50 MHz to 1000 MHz is used. To determine the proper waveform, a transmitting antenna was driven with a 2 nanosecond impulse and the resulting waveform which was a chirp pulse, was measured at a receiving antenna. A generator was constructed to produce the time-inverse of the measured waveform, which was driven into the transmitting antenna. The signal at the output of the receiver antenna was measured and observed to be an impulse with processing gain. The antenna range was calibrated using a CW signal of the same amplitude as the transmitted signal. The processing gain of the system is defined as the ratio of the impulse amplitude and was measured at approximately 20 dB. For this system, the theoretical gain is approximately 23 dB. The generator was a passive device consisting of an array of 46 calibrated coaxial delay lines which delay the front of a step-input waveform. The resulting delayed signals are added, in time, in a series of power combiners to provide the up-chirp pulse. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1980
- Accession Number
- ADA084750
Entities
People
- Philip Steinbach