Questions (with NOAA responses).pdf
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- Request for Information: Global Navigation Satellite System Radio Occultation Instruments and Spacecraft
- Solicitation number
- NOAA-2025-SAE-GRFIQ2
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This document is a file of Questions and Answers (Q&A) for a National Oceanic and Atmospheric Administration (NOAA) Request for Information (RFI) regarding Global Navigation Satellite System Radio Occultation Instruments and Spacecraft. The Q&A addresses technical specifications and requirements, including four key questions about the project. The responses clarify technical details such as Signal-to-Noise Ratio (SNR) requirements, direct broadcast capabilities, and latency definitions. Specifically, NOAA is seeking a sensor with a maximum SNR of greater than or equal to 1600 V/V, with a direct broadcast capability similar to existing systems like High Rate Picture Transmission (HRPT) on JPSS. The latency requirement is defined as the daily median latency, measured from observation to product delivery for each TEC (Total Electron Content) sample. NESDIS is currently examining the entire Radio Occultation (RO) architecture to meet existing requirements, and is open to potential options for lower SNR spacecraft configurations.
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Other files
| File | Type | Posted |
|---|---|---|
| Instrument and Spacecraft RFI v2.pdf | ||
| Instrument and Spacecraft RFI 03112025.pdf |
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Text version
Notice ID: NOAA-2025-SAE-GRFIQ2
Title: Global Navigation Satellite System Radio Occultation Instruments and Spacecraft Request for Information
Responses to Questions Received
1. Given that we do not believe any current RO provider exceeds a mean Signal-To-Noise Ratio of 1600 V/V, can you confirm this is a Threshold Payload Requirement, and clarify whether it is minimum, median/mean, or peak value?
Response: The requirement is related to the maximum SNR of the payload. We are looking for a sensor that provides a maximum SNR of greater than or equal to 1600 V/V.
2. Is there a class of mission that would have a lower SNR requirement?
Response: NESDIS is currently examining the entire RO architecture in order to meet the existing NESDIS requirements. There may be options for utilization of lower SNR spacecraft. A recommendation would be to at least provide the parameters as outlined in Table 4.1 in the RFI.
3. Please would you clarify what are the objectives behind the Direct Broadcast Capability requirement? (e.g. who/what is this broadcasting to?)
Response: The objectives of the Direct Broadcast capability are extremely similar to the objectives of other direct broadcast systems such as the High Rate Picture Transmission (HRPT) system on JPSS and the MetOp-B/C and the upcoming Direct Data Broadcast (DDB) on EPS-SG. The intention is to provide near real-time (live) payload data as it is being sensed. The interface would be received by users to support local nowcasting applications and additional reception of data to assist in regional latency reduction. This would likely require a transmit capability in addition to a primary system.
4. Latency requirements: What definition would you be looking for? Is that mean or max? Is latency defined from the beginning or end of an ionospheric track, or something in between?
Response: The latency is the daily median latency. The latency is defined as the time from observation to delivery of products for each 1 Hz TEC sample (or given sample rate for TEC data).
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