Coherent Frequency Reference Generation in the NASA Deep Space Network
JET PROPULSION LAB PASADENA CA TIME AND FREQUENCY SYSTEMS RESEARCH GROUP
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JPL is nearing completion of a new frequency reference generation and distribution system to replace the DSN FTS Coherent Reference Generator CRG. The existing CRG selects the online frequency standard, synthesizes standard reference frequencies, and provides fan-out to distribute to users which may be up to 30 km away. Like the existing CRG that is critical to DSN operation, the replacement system must be extremely reliable and preserve the high stability and low phase noise performance of the central frequency standard. In addition, in the replacement system the process and effect of switching to other backup or specialized frequency standards should also be transparent to DSN Operations. Reliability shortcomings of the old system are addressed by upgrading to modern and modular system components, reducing the number of distributed frequencies, and adding redundancy or managing single points of failure.
- Electrical and Electronic Equipment
- Test Facilities, Equipment and Methods
- Unmanned Spacecraft