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1. WO2021066933 - METHODS TO COMPRESS RANGE DOPPLER MAP (RDM) VALUES FROM FLOATING POINT TO DECIBELS (DB)

Publication Number WO/2021/066933
Publication Date 08.04.2021
International Application No. PCT/US2020/044747
International Filing Date 03.08.2020
IPC
G06F 7/483 2006.01
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
FELECTRIC DIGITAL DATA PROCESSING
7Methods or arrangements for processing data by operating upon the order or content of the data handled
38Methods or arrangements for performing computations using exclusively denominational number representation, e.g. using binary, ternary, decimal representation
48using non-contact-making devices, e.g. tube, solid state device; using unspecified devices
483Computations with numbers represented by a non-linear combination of denominational numbers, e.g. rational numbers, logarithmic number system or floating-point numbers
G06F 7/499 2006.01
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
FELECTRIC DIGITAL DATA PROCESSING
7Methods or arrangements for processing data by operating upon the order or content of the data handled
38Methods or arrangements for performing computations using exclusively denominational number representation, e.g. using binary, ternary, decimal representation
48using non-contact-making devices, e.g. tube, solid state device; using unspecified devices
499Denomination or exception handling, e.g. rounding, overflow
CPC
G06F 7/483
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
FELECTRIC DIGITAL DATA PROCESSING
7Methods or arrangements for processing data by operating upon the order or content of the data handled
38Methods or arrangements for performing computations using exclusively denominational number representation, e.g. using binary, ternary, decimal representation
48using non-contact-making devices, e.g. tube, solid state device; using unspecified devices
483Computations with numbers represented by a non-linear combination of denominational numbers, e.g. rational numbers, logarithmic number system, floating-point numbers
G06F 7/49947
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
FELECTRIC DIGITAL DATA PROCESSING
7Methods or arrangements for processing data by operating upon the order or content of the data handled
38Methods or arrangements for performing computations using exclusively denominational number representation, e.g. using binary, ternary, decimal representation
48using non-contact-making devices, e.g. tube, solid state device; using unspecified devices
499Denomination or exception handling, e.g. rounding, overflow
49942Significance control
49947Rounding
Applicants
  • RAYTHEON COMPANY [US]/[US]
Inventors
  • COX, Lloyd
  • INGRAHAM, Matti R.
  • MIELKE, David R.
  • SHEEN, Dan R.
  • HAYDEN, Rhett
Agents
  • PERDOK, Monique M.,
  • ARORA, Suneel, Reg. No. 42,267
  • BEEKMAN, Marvin L., Reg. No. 38,377
  • BIANCHI, Timothy E., Reg. No. 39,610
  • BLACK, David W., Reg. No. 42,331
  • LANG, Allen R., Reg. No. 58,829
  • MCCRACKIN, Ann M., Reg. No. 42,858
  • SCHEER, Bradley W., Reg. No. 47,059
Priority Data
16/592,50903.10.2019US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) METHODS TO COMPRESS RANGE DOPPLER MAP (RDM) VALUES FROM FLOATING POINT TO DECIBELS (DB)
(FR) PROCÉDÉS DE COMPRESSION DE VALEURS DE CARTE DE DISTANCES DOPPLER (RDM), DE VIRGULE FLOTTANTE À DÉCIBELS (DB)
Abstract
(EN)
Embodiments of a telemetry device and methods to convert a binary floating point number to a compressed number is described herein. The binary floating point number may comprise a mantissa and an exponent. The telemetry device may determine a first number based on a product of the exponent and a constant, wherein the constant may be proportional to a logarithm of the number two. The telemetry device may determine a second number using one or more bits of the mantissa as an index into a predetermined lookup table. Values of the lookup table may be proportional to logarithms of candidate mantissa values. The telemetry device may determine the compressed number based on rounding of a sum. The sum may include the first and second numbers. The rounding may be based on a predetermined step size.
(FR)
Des modes de réalisation de la présente invention concernent un dispositif de télémétrie et des procédés pour convertir un nombre binaire à virgule flottante en un nombre compressé. Le nombre binaire à virgule flottante peut comprendre une mantisse et un exposant. Le dispositif de télémétrie peut déterminer un premier nombre sur la base d’un produit de l’exposant et d’une constante, la constante pouvant être proportionnelle à un logarithme du nombre 2. Le dispositif de télémétrie peut déterminer un second nombre à l’aide d’un ou de plusieurs bits de la mantisse servant d’indice dans une table de conversion prédéfinie. Des valeurs de la table de conversion peuvent être proportionnelles à des logarithmes de valeurs de mantisse candidates. Le dispositif de télémétrie peut déterminer le nombre compressé sur la base de l’arrondissement d’une somme. La somme peut inclure les premier et second nombres. L’arrondissement peut être basé sur une taille de pas prédéfinie.
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