Accession Number:

ADD012355

Title:

Apparatus for the Detection of Angles-of-Arrival of Radio Frequency Signals.

Descriptive Note:

Patent Application,

Corporate Author:

DEPARTMENT OF THE ARMY WASHINGTON DC

Report Date:

1986-05-07

Pagination or Media Count:

20.0

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 waves.

Subject Categories:

  • Direction Finding
  • Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE