ST2276
Scientech Technologies Pvt. Ltd.
20
Theoretical Normalized Auto-correlation Function
Figure 14
The auto-correlation peak is maintained by continually adjusting the locally generated
code for peak correlator output. The unlimited BW provides a sharp correlation peak
and steep early/later slope which facilitates accurate error correction for the code-
lock-loop (also called Delay Lock Loop).
In reality, a GPS receiver would need a brick wall band pass filter with a BW of at
least ten times the code C/A code chipping rate to be capable of capturing> 99% of
the GPS spread spectrum signal. For most GPS receiver this is generally not practical
to achieve.
Conclusion :
HiK-Consulting
