Abstract
A 1019 bit Legendre code was evaluated for use in digital ionosondes. Experimental testing was done using the Canadian Advanced Digital Ionosonde (CADI). Theoretically, the 1019 Legendre code autocorrelation function of this new sequence has very low peak sidelobe level of −32.6 dB, and the system signal‐to‐noise‐ratio (SNR) will be improved by 30 dB compared with a single pulse code. Field experiments were done near London, Ontario, Canada, using two CADIs in a bistatic arrangement with 20 km spacing. The experimental results agreed with the theoretical estimation (with ∼1 dB error), but a 10 Hz frequency difference between the two computers' reference frequencies, which showed up as a Doppler shift in ambiguity function, necessitated additional signal processing to get optimal performance. The experimental measurements showed that the system was able to get ionospheric echoes with very low power transmission (1 W peak) at a quiet receiving site because of the high system SNR.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.