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New quasi‐complementary code sets for atmospheric radar applications
Author(s) -
Rastogi Prabhat K.,
Sobolewski Gregory
Publication year - 1990
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/rs025i005p01087
Subject(s) - side lobe , autocorrelation , radar , residual , algorithm , transmitter , set (abstract data type) , computer science , binary number , code (set theory) , mathematics , telecommunications , channel (broadcasting) , statistics , programming language , arithmetic , antenna (radio)
The basics of using low‐autocorrelation binary sequences in high‐resolution atmospheric radar experiments are briefly reviewed. An exact cancellation of correlation side lobes with repeated complementary code pairs is often not attained due to transmitter nonlinearities and due to poor coherence of atmospheric targets. Sulzer and Woodman (1984) have recently introduced quasi‐complementary code sets (QCCS) of low‐autocorrelation binary sequences, obtained by an extensive computer search, for which the side lobes nearly cancel on accumulation over the set. Improved performance of QCCS over complementary pairs has been confirmed in experiments with the Arecibo UHF radar. We report here an exhaustive computer search for a base set of 32‐bit binary sequences with correlation side lobes at level 3. These codes are then combined in optimal QCCS of several even set sizes with a residual correlation side lobe level of 2, or 6 dB better than for a sample QCCS of 48 codes given by Sulzer and Woodman. A similar search for 64‐bit codes, using a partial base set of ∼4000 codes with correlation side lobes at level 5 and 6, gives QCCS with a residual correlation side lobe level of 6.