Accession Number : ADA259802


Title :   Effect of Code Augmentation or Truncation on the Signals Produced by a Time-Integrating Correlator


Descriptive Note : Technical note


Corporate Author : DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)


Personal Author(s) : Brousseau, N


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a259802.pdf


Report Date : Oct 1992


Pagination or Media Count : 80


Abstract : The purpose of this study is to analyse the characteristics of the signals produced by a time-integrating correlator when processing augmented or truncated code. It deals specifically with the description of the peak trains generated by either the autocorrelation of the modified code, the cross- correlation of the modified code with the original code or the cross-correlation of the modified code with a test code of the same length. It is demonstrated that the complex peak patterns thus generated contain information about the modification of the code and that it is possible to retrieve that information by applying specific processing methods. Four processing methods are proposed. The first method extracts information from the peak patterns generated by the autocorrelation of the modified signal. The second method uses the cross- correlation of the modified signal with the original signal while the third method deals with the cross-correlation of the modified code with a test code that has the same length as the modified code. The fourth method allows the determination of the initial fill of truncated codes when the signal-to-noise ratio is sufficiently good.


Descriptors :   *SIGNAL PROCESSING , *OPTICAL CORRELATORS , *ACOUSTOOPTICS , TEST AND EVALUATION , MODIFICATION , CORRELATION , PATTERNS , TRUNCATION , CORRELATORS , CROSS CORRELATION , NOISE , SIGNALS , TIME , SIGNAL TO NOISE RATIO , AUTOCORRELATION


Subject Categories : Acoustooptic and Optoacoustic Devices
      Radiofrequency Wave Propagation


Distribution Statement : APPROVED FOR PUBLIC RELEASE