Accord's GPS Correlator Simulator is a very powerful software package for understanding the characteristics of the GPS satellite signal and its processing in a typical GPS receiver. It provides a sound platform to experiment with various modules that constitute the signal processing section of a GPS receiver.

The Input Signal Simulator generates the GPS spread spectrum signal according to the user's specifications at a configurable low IF. In short, the incoming GPS signal is simulated in this module.

Function

• Generation of C/A code
• Separation of I and Q signals in a Costas Loop
• Computation of Auto and Cross Correlation values
• Signal acquisition using Cell by Cell search
• Signal tracking
• Computation of Doppler and Code phase

Features

Input Signal Simulator

• Generation of C/A codes for all GPS satellites
• Selection of low IF (1.0 MHz to 6.0 MHz)
• Introduction of Doppler (-10 KHz to 10 KHz)
• Variation of carrier phase (00 to 1800)
• Introduction of C/A code chip shift
• Addition of Gaussian noise (-90 dB < SNR < +90 dB)

Signal Processor

• Generation of C/A code for all GPS satellites
• Selection of sampling frequency (1 to 7 MHz)
• Selection of code type (ideal or DCO clocked)
• Variation of DCO resolution (code and carrier)
• Generation of local carrier (1.0 MHz to 6.0 MHz)
• Introduction of estimated Doppler (-10 KHz to +10 KHz)
• Variation of local carrier phase (00 to 1800)
• Introduction of C/A code chip and phase shift
• Selection of Integration per iod (1 to 20)