Simulation and Performance Evaluations of the New GPS L5 and L1 Signals

Table 1

L1 and L5 comparison parameters.

Parameter	L1	L5	Remarks
Bandwidth	2 MHz	24 MHz	The higher bandwidth of L5 can provide better accuracy in noisy environment
Center frequency	1575.42 MHz	1176.45 MHz
Secondary codes	N/A	Neuman-Hoffman (NH) codes	The addition of NH codes in L5 signal: (1) Improved spectral line component spacing; (2) Reduced effect of narrow band interference; (3) Resulted in low cross-correlation; (4) Provided better synchronization at bit level
Chip rate	1.023 MHz	10.23 MHz	Increasing chipping rate of L5: (1) provides greater bandwidth performance, (2) low signal distortion, (3) provides greater accuracy
Data encoding	No	Improved data encoding with Parity & Cyclic Redundancy Check	Greater signal and data integrity can be achieved with advanced methods of encoding