Adaptive array processor

• US 5,028,931 A
• Filed: 05/24/1990
• Issued: 07/02/1991
• Est. Priority Date: 05/24/1990
• Status: Expired due to Term

• Current Assignee: Nortel Networks Limited (Nortel Networks Corporation)
• Original Assignee: STC PLC (f/k/a Standard Telephones and Cables)
• Inventors: Ward, Christopher R.
• Primary Examiner(s): Tarcza, Thomas H.
• Assistant Examiner(s): SWANN, TOD R
• Application Number:
  US07/528,596
• Time in Patent Office: 404 Days
• Field of Search: 342/16, 342/379, 342/380, 342/383, 342/384, 364/724.15
• US Class Current: 342/383
• CPC Class Codes: G01S 7/2813 Means providing a modification of the radiation pattern for cancelling noise, clutter or interfering signals, e.g. side lobe suppression, side lobe blanking, null-steering arrays specially adapted to secondary radar systems G01S13/762; aerials or aerials systems H01Q21/29, H01Q25/00
• CPC Class Codes: G01S 7/36 Means for anti-jamming , e.g. ECCM, i.e. electronic counter-counter measures
• CPC Class Codes: H01Q 3/2605 Array of radiating elements provided with a feedback control over the element weights, e.g. adaptive arrays

Abstract

An off-line processor arrangement for a broadband accelerated convergence adaptive antenna array wherein signals from a plurality of antenna elements are applied to respective identical tapped delay lines (T) the outputs of which are fed through individual signal weighting means to a beamforming network (BFN), the arrangement including one or more lattice filter means (LF) to which the auxiliary antenna element signals are applied together with the output response of the beamforming network to compute sets of weight correction vectors (* W) with which to update weight coefficients and means for storing said updated coefficients, said stored coefficients being applied to the individual signal weighting means to weight the outputs of the tapped delay lines.

Claims

1. An off-line processor arrangement for a broadband accelerated convergence adaptive antenna array, the arrangement including

a plurality of antenna elements,

a like plurality of tapped delay lines, the signal output of each antenna element being applied to the input of a respective one of the tapped delay lines,

a number of individual signal weighting means to each of which is applied the output of a respective one of the outputs of a tapped delay line, and

a beamforming network to which is applied the outputs of the weighting means, the arrangement further including

lattice filter means to which are applied the signal outputs of the antenna elements,

means for applying to the lattice filter means the output response of the beamforming network, wherein the lattice filter means is arranged to compute sets of weight correction vectors for respective antenna element outputs,

means for storing weight coefficients to be applied to the individual signal weighting means,

means for applying said computed weight correction vectors to said storing means to update said stored weight coefficients, and

means for applying said stored and updated weight coefficients at timed intervals to the individual signal weighting means, to weight the outputs of the tapped delay lines.

2. An arrangement according to claim 1 wherein a single lattice filter means is provided, the arrangement further including

means for time multiplexing the signal output of the antenna elements to the lattice filter means whereby the lattice filter means is operated in a time shared mode.