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Not seen this but make it yourself.
It depends on what PIC you use.
I suggest you use TMR1 to compare mode and set Interrupt matching flag.
When you get first IRQ set pulse length into TMR1 compare, when you get second IRQ set pulse interval into TMR1 compare.
(And set and reset the corresponding output pin at the IRQ's of course)
You can attach the TMR1 counter to the internal clock or to an external clock if you want by setting the appropriate bit in Option_Reg (depending on the PIC you use).
Just get yourself a datasheet and start programming.
If you have coocked something that don't work just post it here and I am sure you get many helpfull reply's as this is the best board in the world..........
PPM is commonly used in RF remote controls eg car alarms. I want to take the reciever out of an old alarm I have , connect it to a 16F84 and using the existing PLIPs (They use PPM) I want to switch several external lights on/off using SSRs.