Citation
Abstract
In uplink array operations, alignment of the carrier phase and modulation delay from each antenna is of fundamental importance in achieving maximum array gain. The power spectrum of the combined signal can be obtained at the spacecraft and relayed to the ground for processing, or in near-Earth radar applications the echo signals from small targets can be collected and processed at the ground receiver. Expressions are derived for the power spectrum of a transmitting array of K elements in the presence of phase and delay alignment errors, and simulation results are provided to validate the theoretical results. It is shown that the power spectra are generally sensitive to errors in carrier and modulation alignment, thus enabling uplink array calibration directly from the power spectrum of the combined array signal.
Details
- Volume
- 42-210
- Published
- August 15, 2017
- Pages
- 1–16
- File Size
- 1.4 MB