I've tried looking around for software to decode the data burst but have had zero luck.
Does such a decoder exist and if so, where can it be found?
SCADA is somewhat of a generic term and does not refer to a particular radio protocol. In fact SCADA can be transmitted across many communication mediums including radio, analog wireline, digital wireline, Ethernet or fiber. Complex SCADA systems often use a mix of communication mediums.
Most modern SCADA data radios use proprietary encoding methods and only the same make and model of radio will communicate. Some SCADA systems use the data bearing capabilities of standardized formats like P25 or DMR, especially if there's an existing voice system to piggyback on. Older systems often used Bell 103 or 202 compatible modems. As you can see there's no standard SCADA decoder because there's no such thing as a 'standard' SCADA system.
The data transmitted across the communications link is often
Modbus,
DNP3 or some proprietary format. Assuming you could decode this data you're not going to find any kind of descriptive text in the messages. Messages would be something like "Set coil 17 on" or "Input register 5=0x1F40". Without having access to the facility documentation it's going to be tough to correlate these I/O points to real world values.
As other have noted many of these systems are implementing encryption on the communications links. Most current data radios for the SCADA market include encryption built in. External encryption
devices can be inserted between the data radio and the RTU to retrofit existing installations.
