two questions about OpenGpssim

I have download the OpenGPSSim Version: 0.1.0, and compiled it using visual 
C++6.0

I did the several steps, I mean, ogsencdec,ogsxmit and ogsrcrv. using 
nav-01-template-01-06.txt as input file.But after I changed the output of 
ogsrcrv into ASCII(using ogsencdec), the output nav-out-01.txt has some 
mismatch with the input file nav-01-template-01-06.txt .most of the 
mismatching occurs at the subframe 5 and 4.
why this occur? or is it reasonable that there's some mismatch?

I also used the 393540x36.g12 to extract the navigation data. for every 
PRN, there are many output file with different pageno of subframe 4 and 
subframe 5. in order to simulate GPS signal, which should be used as the 
input file of ogsencdec and ogsxmit to generate the signal?

thanks!

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