Brandywine - Compact Airborne Timing Unit (CATU)
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Ruggedized
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Flight Qualified
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Available with vibration-isolated OCXO or CSAC Oscillator options
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Gigabit Ethernet
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GNSS, SAASM, or M-Code supported
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Designed for GPS denied environments
The Brandywine Communications Compact Airborne Timing Unit is a robust time reference LRU designed for airborne environments.
The CATU processes time of day from an internal GPS receiver (either Commercial or Military), while generating precise dual 10MHz frequency references and dual UTC-aligned ICD-GPS-060B-compliant one-pulse-second signals (1PPS). In addition, the CATU LRU features IEEE 802.3ab (1GbE) Stratum 1 NTP Server functionality.
This versatile timing unit employs its GPS for basic disciplining of its internal Oven Controlled Crystal Oscillator (OCXO), and an – optional – Chip Scale Atomic Clock (CSAC), providing holdover capabilities in a GPS denied environment in excess of 20 hours. Complimented by a low phase noise, vibration compensated 10MHz reference output locked to the 1PPS ICD-GPS-060B compliant output, the Brandywine Communications Compact Airborne Timing Unit provides unparalleled availability of reliable TOD in highly demanding fixed, and rotary-wing applications.
A commercial version with GNSS Receiver is also available.
GPS Antenna Input
Signal Type |
GPS CA GPS P(Y) (optional) GPS M-Code |
Input Signal Level (at receiver RF connector) |
P(Y) on L1: -153 dBW to -121 dBW P(Y) on L2: -153 dBW to -124 dBW C/A on L1: -150 dBW to -119 dBW |
Minimum Operating Bandwidth |
L1 1575.42 MHz ± 10.23 MHz L2 1227.60 MHz ± 10.23 MHz |
Input Impedance | 50 Ω (nominal) |
Input VSWR | 2.5:1 maximum at center frequency of L1 and L2. |
Power
Number of Inputs | 1 |
Voltage | 28VDC per MIL-STD-704F |
Rated Current Draw | 1A |
Interface Type | IS-GPS-154 |
Phase Noise
G-sensitivity | 5x10-11/G |
Vibration Frequency Range | 10Hz-2000Hz |
Allan Deviation |
1 second 1x10-11 10 seconds 1x10-11 100 seconds 5x1011 |
1PPS Output
No. of Outputs | 2 |
Signal Type | Per ICD-GPS-060B |
Signal Rate | 1 pulse per second |
Rising Edge | On Time |
Rise Time | <50ns |
Signal Type | Sinusoid |
Fall Time | <100ns |
Pulse Width | 20 µs ±5% default |
Output Amplitude | 10V ±10% |
Coherency | 1PPS = 10MHz/106 |
10 MHz Output
Signal Type | Sinusoid |
Output Frequency | 10 MHz |
Output Amplitude | 13dBm/1Vrms |
Harmonic Distortion | -30dBc |
Frequency Accuracy (Locked) | 1x10-12 avg. over 24 hours |
Holdover | 1µSecond 24 hours |
Ethernet Interface
Signal Type | Gigabit Ethernet (IEEE 802.3ab) |
Protocols Supported | NTPv4, SNMPv3, SSH |
Physical
Dimensions |
7.29” x 4.52” x 2.36” (185.166mm x 114.808mm x 59.944mm) |
Weight | 3 lbs. (1.36 kg) nominal |
Connectors |
J1 Antenna, SMA J2, J3 1PPS SMA J4, J5 10 MHz SMA J6 D-Sub17 for KLIF, DS/101-232 J7 1Gb Ethernet |
Battery | MMCx |
Antenna Supply | 5V @ 35mA |
Environmental
Operating Temperature | -40°C to +55°C |
Altitude | 41000 ft. |
Humidity | 95% non-condensing |
Environmental Certifications |
Tested to the following specifications: MIL-STD-810F, MIL-STD-461: CS101, CS114, CS115, CS116 |