rf/if over ip considerations for the range
Post on 14-Feb-2022
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Assuring Performance . . . from the Ground Up
Limitation of RF Transport
RFCable
FiberOptic
DistributionRF signals captured at an antenna
can only be transmitted over a short
distances before the signal degrades
<50 km
<0.5 km
ImpactConstrains ground system design
by requiring processing equipment
to be co-located with antennas
Assuring Performance . . . from the Ground Up
10
11
-9
-7
13
6
…
What is Digital IFEnables RF Spectrum to be captured, digitized and converted into IP packets
Sampled IF waveform
I/Q data from antenna /
downconverter
10
11
-9
-7
13
6
…
IP packets
ANSI/VITA 49.0Prefilter
VITA-49 Packets Converted
to RF Waveforms
IP packets
ANSI/VITA 49.0
10
11
-9
-7
13
6
…
10
11
-9
-7
13
6
…
Ability to Manage IP
Transport of VITA IP Packets1
Ability perform faithful RF
reconstruction after transport2
Interfacing to analog or
digital equipment3
Cost effective and
deployable technology4
Issues with Digital IF Adoption
Assuring Performance . . . from the Ground Up
The Packetized IF Solution
STEP 1 STEP 2 STEP 3
Captures, Digitizes
and Packetized
RF Signals
Reliably Transports the
Packetized Signals
Recreates Original RF
Signal for Legacy
Processing Gear
0011010001011001001101101011011000100101011101010110
Private or
Public IP
Network
Simplex or Full Duplex
Instantaneous Bandwidth Range125 kHz up to 54 MHz
Input/Output Tuning Range950-2150 MHz
Deterministic Latency and Jitter Control
Lossless Transport
Faithful analog reconstruction
Precision Signal Alignment
Assuring Performance . . . from the Ground Up
Traditional A/D Translation
Baseband or IF
Oscillator
Low/Bandpass
Filtering
A/D
Digitizer
Mixer
Digitized Samples
RF Amplifier
Analog Translation to Baseband/IF
Assuring Performance . . . from the Ground Up
Direct A/D Translation
Tuned
Bandpass
Filtering
A/D Digitizer
and Digital
Mixer
RF/IF Tuned
Digitized Samples
RF
Amplifier
Direct Sampling and Digital Tuning to RF or IF
Assuring Performance . . . from the Ground Up
10xExpansion
375Mbps
Bandwidth Consumption and Management
RF over IP does require
sufficient IP bandwidth
to support transport
40MHz
750Mbps
8 bits per A/D
sample
20xExpansion
4 bits per A/D
sample
Assuring Performance . . . from the Ground Up
Bandwidth Consumption and Management
Ability to select the bandwidth of interest from the instantaneously captured BW
Instantaneous 54 MHz Bandwidth Capture
125
kHz
200
KHz
5
MHz
2
MHz
1.25 Mbps 2 Mbps50 Mbps20 Mbps
Network
throughput
required
at 4 bits
Spectral Channels
Assuring Performance . . . from the Ground Up
Packetized IF Use Cases
RF/IF Over IPRemoves the
Distance
Barrier of RF
Distribution
Centralization of Ground
System Operations
Mitigate Rain
Fade Provide
Guaranteed Service
Unlimited Antenna
Placement Flexibility
Enabling New
Backup and Disaster
Recovery Strategies
Interconnecting
Teleports to Enable
New Services
Virtualization of the
Ground Segment
Assuring Performance . . . from the Ground Up
Centralization of Ground System Operations
Today:
Equipment must located in close proximity to antennas due to RF/IF signal attenuation
Central Data
SiteEffectively Range limitation
1 km coax, 50 km RF fiber
WAN
Spectral Mon
Remote
Antenna Site
RF/IF IFL IF Switch
Modem Crypto
Gateway
Assuring Performance . . . from the Ground Up
Centralization of Ground System OperationsWith RF/IF over IP:The proximity constraints between antennas and processing equipment is eliminated
Direct A/D, D/A Using IP packets
Central Data
Site
Front End
A/D
Enables
WAN
Effectively NO Range limitation
Spectral Mon
Remote
Antenna Site
RF/IF
Modem Crypto
Gateway
Remote
End D/A
Equipment Pooling
Reducing space and power footprint
Centralized operations
Better use of personnel
1
3
2
4
Assuring Performance . . . from the Ground Up
Centralization of Ground System Operations
Direct A/D, D/A Using IP packets
Central Data
SiteDigital Recording Enables
WAN
Spectral Mon
Remote
Antenna Site
RF/IF
Modem Crypto
Gateway
Digital Record/Playback Digital Record/Playback
Recorded contact data used in anomaly
resolution
Playback used in training environment
Data retrieval for analysis
Archival/history collection
1
3
2
4
Assuring Performance . . . from the Ground Up
Antenna Placement FlexibilityDynamic support
for tactical
environments
1
Optimize signal
reception2
Simplify disaster
recovery planning3
Central Data
Site
Direct A/D, D/A Using IP packets
Front End
A/D
WAN
Range
Antenna Site
RF/IFRemote
End D/ARemote
Range Sites
Assuring Performance . . . from the Ground Up
RH/LHCP
RF over IP Legacy Support
A/D Digitizer
SpectralNet DigitalUp/Down Converter
GPS Timing Source
GPS Timing Source
Data + Clock
RHCP
LHCP
S-Band Receiver (s)
RF over IP VITA-49 Data Packets
1.750-2.450 GHzS/L-Bandor C-Band
A/D Digitizer
RF Capture
SpectralNet
S/L-Band Receiver (s)
D/A Digitizer
RHCP
D/A Digitizer
ConvertedIF Capture
LHCPS/L-Band Receiver (s)
S/L-Band Receiver (s)
Data + Clock LNARF
IF Capture
Front End A/DDigitizer
• Dual RF Inputs, sub-band tuning• Digital frequency conversion• RH/LHCP output transported using RF over IP• Supports legacy receivers for easier transition to RF over IP• Provides VITA-49 IF over IP Digital Interface for Future RF over IP Application
RH/LHCP RF Over IP
Remote EndD/A
Digitizer
Support for Legacy Receivers at Antenna
Relocated Legacy Receivers
RH/LHCPRF Over IP
Optional Consolidated Data Center
Assuring Performance . . . from the Ground Up
CombinedRF Over IP
RF over IP Combiner Range Application
A/D Digitizer
SpectralNet DigitalUp/Down Converter
GPS Timing Source
GPS Timing Source
Data + Clock
RHCP
LHCP
RF over IP VITA-49 Data Packets
1.750-2.450 GHzS/L-Bandor C-Band
A/D Digitizer
RF Capture
SpectralNet
Single, Combined Output
S/L-Band Receiver
D/A Digitizer
D/A Digitizer
LNARF
Front End A/DDigitizer
• Dual RF Inputs, sub-band tuning• Digital frequency conversion• Pre-Detect combined output transported using RF over IP• Adds combiner, AM tracking, and digital recording to reduce antenna hardware • Supports legacy receivers for easier transition to RF over IP• Provides VITA-49 IF over IP Digital Interface for all digital receivers
CombinedRF Over IP
Remote EndD/A Digitizer
Relocated Legacy Receivers
Diversity Combiner
AM Tracking Receiver
Digital Recording/Playback
To ACU
Digital Recording/Playback
All DigitalVITA-49
Range Receiver (s)
Data + Clock
S/L-Band ReceiverData + Clock
Additional Networked Site(s)
Remote End D/ADigitizer
Combined RF Over IP
Consolidated Data Center
GPS Timing Source
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