Citation
Abstract
Utilization of the increased capability of the DSS 14 transmitter and antenna for planetary radar transmission has been made possible by the design, construction, and installation of a digital modulator at DSS 14. This device reshapes the digital modulating waveform generated at DSS 13 and received over the microwave link at DSS 14. The digital modulator output is an accurately adjustable 2-level waveform used to biphase-modulate the transmitter frequency. During precalibration setup, the digital modulator provides selectable frequency square waves used in correctly adjusting the waveform amplitude to obtain carrier suppression greater than 40 dB. The capability that this technique provides has been demonstrated in planetary radar experiments. By this method, one station’s processor can be used to generate commands to be sent to a spacecraft from another station at the same complex, thus increasing the reliability of the DSN command system.
Details
- Volume
- I
- Published
- February 15, 1971
- Pages
- 63–65
- File Size
- 238.3 KB