LDI DIGISONDE 4D - Figure 1-3: Turnstile Receive Antenna with Attached Preamp Module

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DIGISONDE-4D
SYSTEM MANUAL
VERSION 1.2.11
SECTION 1 - GENERAL SYSTEM DESCRIPTION 1-5
Figure 1-3: Turnstile Receive Antenna with Attached Preamp Module
1:5. Noteworthy technology involved in Digisonde-4D system includes:
• Fast 16-bit analog to digital (A/D) converters for the digital receivers
• Electronically switched active crossed loop receiving antennas
• 15 decibel (dB) signal processing gain from phase coded pulse compression
• 21 dB additional signal processing gain from coherent Doppler integration
• Up to 35 dB signal gain via RF Interference Mitigation algorithm
• Two embedded computing platforms for hardware control, data acquisition user commanding, data
processing, storage, publishing, and dissemination
• Software implementation of the signal processing functions applied to the time domain data
• Automatic ionospheric layer identification and parameter scaling by an embedded expert system
ARTIST 5
• World-wide web access to real-time measurement data