The CWIS digitizes a complex signal pair from two received polarizations from each receiving station, for a maximum of eight sampled analog signals. Table 1 shows the received signals. The received analog inphase and quadrature complex pairs are signals from right circular and left circular polarization antenna feeds. The CWIS must acquire and store two complex channels at a sample rate of 1 MHz each. Data resolution is 12 bits.
Signal sampling is simultaneous across the eight channels.
The CWIS acquires and stores critical receiving system parameters. The parameters are used to correct acquired data for system induced errors. The antenna azimuth and elevation, receiver system noise temperature and transmitted power are recorded. Real-time correction for system induced errors is provided when processing power permits. The CWIS records large amounts of data produced during GSSR experiments including raw complex voltage samples, averaged power and cross power data and baseline removed and averaged power data.