Citation
Abstract
The tracking assistor improves the performance of DSN receivers at fast doppler rate and high noise level by removing the stress in the phase locked loop of the receiver. The assistor is basically a down-up converter inserted in the 24-MHz feedback path of the receiver that removes the loop stress by subtracting the doppler, which is computed by a programmed local oscillator (Ref. 1). Since the input and output frequencies are nearly identical, special filtering and construction techniques are required to achieve the extremely high isolation necessary to prevent undesired phase modulation within the loop. The synchronous assistor was employed during superior conjunction of MM’71. During this period it was possible to obtain ranging data, a measurement not possible with either of the receivers in their standard or third-order loop configuration.
Details
- Volume
- XVI
- Published
- August 15, 1973
- Pages
- 30–32
- File Size
- 246.8 KB