Accession Number:

AD1076122

Title:

Multi Channel Digital Equalization to Enable Wideband Digital Arrays

Personal Author(s):

Corporate Author:

University of Oklahoma Norman United States

Report Date:

2019-03-25

Abstract:

In a digital beamforming system, equalization in the digital domain is utilized to help in calibration and reducing errors induced by the system processing chain. This is done by precisely matching amplitude and phase between elemental channels. Without this critical processing step, the desired beamforming i.e., main beam and null of next generation radar systems cannot be achieved. This paper addresses the problem of implementing equalization in real time to enable wideband digital arrays. Several equalization algorithms were evaluated and implemented to produce FIR coefficients including our polyphase based equalizer. To our knowledge this type of equalization implementation has not been utilized before in this way. These concepts were demonstrated on data collected from a benchtop four-channel RF system prototype. Additionally, a beamforming environment was created to show the importance of equalization in forming nulls and main lobes. A true-time delay TTD FIR filter was combined with the chosen minimum mean-square-error MMSE equalization FIR filter followed by a wideband adaptive digital beamforming ADBF FIR filter to display results.

Descriptive Note:

Conference Paper

Supplementary Note:

GOMACTech Conference (GOMACTech 19) , 25 Mar 2019, 28 Mar 2019, See also AD1074821 - GOMACTech Conference (GOMACTech 19) "Artificial Intelligence and Cyber Security: Challenges and Opportunities for the Government" held in Albuquerque, NM 25-28 March 2019.

Pages:

0004

Descriptors:

Identifiers:

Subject Categories:

Modernization Areas:

Distribution Statement:

Approved For Public Release;

File Size:

1.40MB

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