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A MINIMAL-HARDWARE STRUCTURE FOR A CORNER-TURN MEMORY, WITH AND WITHOUT A FRAME OVERLAP REQUIREMENT

IP.com Disclosure Number: IPCOM000006935D
Original Publication Date: 1993-Jun-01
Included in the Prior Art Database: 2002-Feb-11
Document File: 2 page(s) / 89K

Publishing Venue

Motorola

Related People

J. D. Marchant: AUTHOR

Abstract

This publication describes a novel method for mini- mixing the memory and controlling hardware for a cor- ner turn memory (CTM). The CTM may or may not have a frame-overlap requirement, but hardware is mini- mixed in either case.

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MOTOROLA INC. Technical Developments Volume 19 June 1993

A MINIMAL-HARDWARE STRUCTURE FOR A CORNER-TURN MEMORY, WITH AND WITHOUT A FRAME OVERLAP REQUIREMENT

by J. D. Marchant

   This publication describes a novel method for mini- mixing the memory and controlling hardware for a cor- ner turn memory (CTM). The CTM may or may not have a frame-overlap requirement, but hardware is mini- mixed in either case.

  A CTM without frame-overlap requirement is very commonly used in radar digital signal processors for detecting moving objects hidden in radar video. A CTM with frame-overlap requirement is most common in Syn- thetic Aperture Radar @AR) processors. The output of the CTM is typically fed to some form of Discrete Fourier Transform (DFT) computer within the processor.

  Consider first minimiiing the controlling hardware and memory for a CTM without a frame-overlap require- ment. The controlling hardware allows for a memory size of only one memory location per element stored per frame, which is the minimum memory possible. This is half of the memory required for the usual ping-pong scheme. The implementation is applicable only if the element x-dimension and the element y-dimension of the frame are both powers of the same number N.

  Referring to Figure 1, element counter 20 is clocked by an element strobe 30. The counter output 10 is fed as an address to optional lookup table 21, which yields a binary-coded base-N value 11. If N is 2, the lookup 21 is not required. Output 12 of frame counter 22 controls the amount of circular shill in barrel shier 23, whose output 13 is fed as an address to optional lookup table
24. If N is 2, the lookup 24 is not required. The fmal output 14 is the address fed to the CTM. Frame counter 22 is clocked by frame strobe 32, whose element fre- quency is once every X*Y number of elements. X and Y are the...