Accession Number : ADA249314


Title :   L'Application des Codes de Costas et des Codes a Congruences Quadratiques a la Compression d'Impulsion Numerique (The Application of Cost, Codes and Quadratic Congruence Codes to the Compression of Numeric Impulsion)


Descriptive Note : Technical note


Corporate Author : DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)


Personal Author(s) : Delisle, C ; Blanchette, M


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a249314.pdf


Report Date : Dec 1991


Pagination or Media Count : 28


Abstract : In this report we present the analysis and construction methods for two types of frequency coded pulses: (a) Costas codes and (b) quadratic congruential codes. These codes have the characteristic of producing a thumbtack ambiguity diagram with low sidelobes. Computer simulations were performed to calculate their autocorrelation functions. Comparative evaluation of the performance of these codes and well known codes was carried out. Results showed that Costas codes and quadratic congruential codes have low sidelobes but not as low as the chirp, step-chirp or pseudo-random codes.


Descriptors :   *COMPUTERS , FUNCTIONS , AUTOCORRELATION , DIAGRAMS , CONSTRUCTION , AMBIGUITY , SIDELOBES , FREQUENCY , RADAR


Subject Categories : Cybernetics


Distribution Statement : APPROVED FOR PUBLIC RELEASE