Coherent C-Band Transponder Standards.
Abstract
The objective of this document is to define minimum transponder parameters in such a manner that any C-band instrumentation radar on any test range may use the transponder. It is not the goal of these standards to require all transponders to use the same pulse code spacing or the same spot frequencies. Rather, it is to establish an envelope of frequencies and codes within which all test ranges may operate. In this way, the goals can be met and yet the interference-free traffic capacity will be larger than if only one system of codes and spot frequencies was used. Many of the parameters can and will undoubtedly be improved. There are three basic designs of a coherent pulse radar transponder, however only two are in use for trajectory measurement application. Both employ superheterodyne receivers, delay at the intermediate frequency, and heterodyne the signal back to the carrier frequency through the use of a common local oscillator. If the transponder has good stability, the phase of the reply will bear a fixed relationship to the interrogation signal. The difference between the two transponder types occur in the transmitter section. One design achieves power gain by cascading injection locked oscillators.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1986
- Accession Number
- ADA165811