DETECTION OF DOPPLER AND OTHER SIGNALS IN A HOMODYNE PULSE SYSTEM
Abstract
A homodyne pulsed radio altimeter is analyzed. First the instantaneous phase difference between the transmitted and received waves, for both the phase coherent and noncoherent cases, is discussed. The possibility of reconstructing a doppler, and/or a frequency modulation induced beat frequency from a series of pulses is then considered, and finally attention is given to the mixer where the effect of low pass filtering on its output is analyzed. An expression defining the percentage of the total received signal that may be converted to a useful output from a given number of available pulses is derived. This expression is a function of the circuit parameters and the time delay between transmission and reception. Graphs of the filtered mixer output and the percentage of the signal recovered as a function of time delay are presented. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 07, 1961
- Accession Number
- AD0263657
Entities
People
- Louis M. Tozzi
Organizations
- Harry Diamond Laboratories