Abstract
The L2 Civil Signal (L2CS) will be transmitted by modernized IIR(IIR-M),
IIF and all subsequent GPS satellites. It contains two codes of different
length; CM code contains 10,230chips, repeats every 20milliseconds
and is modulated with message data, and CL code contains 767,250chps,
repeats every 1.5second Z-count and has no data modulation. And the
message data is encoded for Forward Error Correction (FEC). Although
it has a good cross-correlation performance by the long code length,
but the acquisition time should be long. Because the acquisition
time is directly proportional to the code length and/or code period.
Therefore it takes about 100 hours for L2C signal acquisition in
case of 20ms integration. So, there should be a fast signal acquisition
scheme. There are many methods to reduce the acquisition time, but
most of them require the modification of the correlator. The L1 aiding
method does not require any modifications and it can acquire the
L2C signal as fast as the L1 signal. Finally, the L1 aiding method
would be confirmed by experimental results in this paper and the
acquisition and tracking of L1 and L2C signal also would be shown.
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