STUDY OF ADVANCED ANTENNA TECHNIQUES FOR AEROSPACE VEHICLE DOPPLER VELOCITY SENSORS.
Abstract
This program investigated new antenna techniques for doppler velocity sensing systems used in spacecraft guidance applications. The investigation is concerned with a flush-mounted antenna for an active doppler velocity sensor for reentry-glide navigation on space vehicles. This antenna is required to generate four symmetrically-oriented beams about its normal with 20 to 30 db of isolation (for pulsed operation) between the signals which are transmitted and received along each beam. In addition, the antenna beam direction must not be affected by variation in the attitude of the vehicle. A two dimensional array of slots in square waveguide with four isolated feed ports was devised to meet this requirement. The array consists of a number of square waveguide branch lines which are fed by two square waveguide feed lines. Port isolation is obtained by utilizing the polarization isolation that exists between the TE10 and TE01 modes in the square waveguide. The design data for the feed guide arrays are presented in this report. Problems associated with the construction of the branch line arrays and feed line arrays are discussed. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 14, 1963
- Accession Number
- AD0422967