Apparatus for the Detection of Angles-of-Arrival of Radio Frequency Signals.
Abstract
Incoming radio frequency signals from one or more remote transmitters, that may be changing or 'hopping' in frequency, are received at two closely spaced antennas. A pair of Chirp-Z transform processors are respectively coupled to said antennas. The transform processors are operated in synchronism and produce a pair of sampled comb filter output responses, each of which comprises a multiple of frequency 'bins' distributed over a given spectrum. The bins are read out of the Chirp-Z processors in a synchronous sequential order, and each bin is represented by a pair of signals in phase quadrature. The phase quadrature signals of corresponding bins are multiplied in a predetermined manner and the products there of are selectively added and subtracted to provide a predetermined function (tan psi) of the phase difference (psi) between the signals incident on the pair of antennas. This predetermined function is coupled to a processor that calculates a trigonometric function (are sine) thereof which is indicative of the angle-of-arrival of the incident wave(s).
Document Details
- Document Type
- Technical Report
- Publication Date
- May 07, 1986
- Accession Number
- ADD012355
Entities
People
- Barry T. French
- Dirk R. Klose
- George Czentirmai
Organizations
- United States Army