Design, Construction and Demonstration of an Airborne, Low Frequency, Phase-Stable Receiver.
OHIO UNIV ATHENS DEPT OF ELECTRICAL ENGINEERING
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Aircraft navigation using direct-ranging radio methods relies upon the processing of the carrier phase delay information accrued between a transmitter and a user. The first requirement following reception of the carrier wave is to raise its amplitude to a useable value. An RF filtering and amplification scheme using analog methods is invariably used whether detection and further processing is achieved by analog or digital methods. The primary design requirement for a navigation receiver for direct-ranging applications is throughput phase stability. In the elected design a fixed-tuned TRF cascade of LC filters and integrated circuit gain blocks exhibits a stability of one electrical degree in the LF band at 300 KHz with a one sigma standard deviation. Measured performance includes a 3 DB overall bandwidth of 1.9 KHz, a noise figure of 6 db and a maximum voltage gain of 70 DB. Author
- Radio Communications