3 Sample Configurations
Designed & Optimized
for Wideband Data Collection
Maximizing Data Flow & Eliminating Bottlenecks
Delphi’s DAQStream data recorders deliver unprecedented high-speed signal collection capability for bandwidth-intensive sensor platforms and applications including: ELINT, SIGINT, ISR, Remote Sensing, and RF Spectrum Analysis. A combination of high sample rate, high sensitivity and continuous sample collection maximize the probability of intercept (POI) and identification for system operators. This paper describes three sample configurations that solve demanding data recording challenges using Delphi’s portfolio of high-performance COTS, embedded computing products.
The Delphi DAQStream’s industry-leading recording bandwidth is made possible by a unique set of high-bandwidth components, designed to maximize data flow and eliminate bottlenecks. Wideband spectrums digitized by Delphi’s Gigahertz (GHz) class of ADC modules are processed by the PC7 Virtex-7 based FPGA carriers, and streamed over PCIe Gen 3.0 channels into an optimized SSD RAID storage subsystem at up to 6 gigabytes per second (GB/s) per DAQStream carrier. Delphi offers a range of GHz class ADC modules for front-end sampling and matching DAC modules for RF playback capability.
Turnkey Systems Providing:
- Recording and Playback at up to 6 GBytes/s Per Carrier for Multiple Hours
- Continuous Recording with No Time Gaps
- Recording of Samples at the Full Rate of Today’s Fastest ADCs
- Scalable System Bandwidth
- Clock and Trigger Synchronization of Multiple Channels
Meeting the Modern Spectrum Collection Challenge
Today’s military intelligence analyst faces the challenge of an increasingly crowded signal environment, containing modern low probability of intercept (LPI) waveforms. Typical systems have a bandwidth of 500 MHz or less and require complex schemes to scan or multiplex a wide frequency spectrum in sub-band segments and employ strategies to revisit bands where signals of interest are detected for further data collection and analysis. These schemes require complex and expensive hardware and software, yet remain susceptible to LPI signals due to the effects of time gaps, frequency division, and limited SNR.
As an example, an ELINT system operator often requires the data recorder to collect raw I/Q sample data for off-line computer analysis and playback. They require increased system spectral bandwidth and sensitivity that together challenge data recording bandwidth capacity.
An example system with a 500 MHz IF bandwidth sampled with 1 GHz 8-bit ADCs requires 1 GB/s of raw sample recording bandwidth. The need to improve on this for increased POI, requires both faster sampling and more bits which increases the bandwidth load on the recording system. To illustrate, increasing the IF bandwidth to 1 GHz with I and Q sampling of 1.33 GHz at 12-bits requires 4 GB/s of raw sample recording bandwidth. Moving to a dual 2 GHz, 12-bit sampling system would require 6 GB/s of raw sample recording bandwidth. Additional requirements for these systems may include such functions as: programmable digital down-conversion, spectrum analysis, signal discrimination, demodulation, pulse detection, and pulse descriptor word generation. Performing such numerically intensive processing tasks, at GHz sampling rates, requires the latest in FPGA technology.
The Delphi DAQStream Solution
Delphi’s DAQStream wideband data recorders are able to deliver market leading high-speed recording and playback capability through the use of a carefully engineered set of hardware, firmware, software, and interconnect technologies integrated with a validated set of host and storage components. These Delphi products include:
- PC7: PCIe Gen 3.0, Virtex-7 FPGA carriers
- ADF: High-speed, high SNR ADC FMC modules
- DAC: High-speed, DAC FMC Module
- ADCView DS: GUI software for DAQStream system control & configuration
- ADCStream: High-efficiency data flow control GUI software
- ClkSync: Module for precise interchannel synchronization
- DAQStor: Multi-Terabyte SSD JBOD array
DAQStream component sets are designed for easy expansion and replication to increase system bandwidth while maintaining sampling coherency across channels.
PC7: The engine of the DAQStream system is Delphi’s PC7, a PCI Express (PCIe) Gen 3.0, Virtex-7 based FPGA carrier. The PC7 facilitates high bandwidth data flows between each of its two FMC slots and the DAQStream host storage system. The PC7 sets the benchmark for performance and versatility in the embedded PCIe market. Its eight PCIe Gen 3.0 lanes, have sufficient bandwidth to support DEG’s fastest ADC modules. For example, configurations with two 2 GHz 12-bit ADCs, four 400 MHz 14-bit ADCs, one 4 GHz 12-bit ADC are all supported. Firmware on the PC7 coordinates multi-GByte streaming data flow between the DAQStream’s ADC front-end and system memory, before making highspeed DMA transfers to an SSD RAID storage system. Delphi’s PC7 and Mezzanine card combination is the only PCIe FMC Carrier on the market that accommodates two FMC cards on a single PCIe carrier in an enclosed 3U PC Chassis
DAQStream System Configuration Examples
This example illustrates a simple, yet high performance recording system that digitizes a single IF input channel and records the raw samples for offline analysis. This is a complete turnkey system. The customer supplies an IF input, selects the Record button in ADCStream, and the digitized signal is recorded to disk.
System has a 1 GHz IF center frequency with a 1 GHz bandwidth of interest and requires to record continuous sample data at or above the Nyquist rate of their maximum frequency extent and 47dB SFDR. Requires one hour of continuous signal recording and playback. Customer has 3 GHz system clock from IF mixer section.
The 3 GHz, 10-bit, 5 GHz input bandwidth ADC of the ADF-3000 meets the sampling and SFDR requirements. With its digitized samples packed by the PC7, the downstream data bandwidth is 3.75 GB/s. Sixty minutes of continuous recording requires 13.5 terabytes (TB) of storage (3.75 GB/s x 60 sec x 60 min). A single RAID controller and SSD JBOD array can maintain this data bandwidth and capacity.
DAQStream solution system consists of:
- PC7: PCIe Gen 3.0, Virtex-7 FPGA Carrier
- ADF-3000: 3 GHz ADC FMC in FMC Site #1
- DAC-D2500: 2.5 GHz DAC FMC in FMC Site #2
- SSD DAQStor RAID System
- ADCStream Software