NAELCOM - Acutime Gold - pour la synchronisation et la précision temporelle.

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Acutime Gold
GPS Smart Antenna for Precise Timing and Synchronization

datasheet

Introduction

Trimble’s Acutime™ Gold GPS smart antenna marks the integration of the latest GPS technology into a rugged selfcontained unit that enables easy integration into any system. The Acutime Gold is a pole-mounted GPS receiver and antenna in a single environmentally sealed enclosure.

The Acutime Gold GPS smart antenna design continues Trimble’s line of GPS smart antennas, which have been in production since 1991. The GPS smart antenna is the perfect solution for precise timing and network synchronization needs, including broadband wireless applications. It provides a cost-effective and independent timing source (within the firewall) for any application, such as fault detection systems and synchronization of wireless networks.

Once power is applied, the Acutime Gold automatically tracks satellites and surveys its position to within meters. It then switches to overdetermined time mode and generates a pulse-per-second (PPS) output synchronized to UTC within 15 nanoseconds (one sigma), outputting a time tag for each pulse. The Acutime Gold GPS
smart antenna’s T-RAIM (Time-Receiver Autonomous Integrity Monitor) algorithm ensures PPS integrity.

Designed for long-term reliability, the Acutime Gold GPS smart antenna is corrosion-resistant and waterproof, and has a rounded top that facilitates run-off from the elements.

Physical Interface

The RS-422 interface is ideal for long cable runs required by buildings or towers. Standard cables are available in lengths up to 400 feet. Custom lengths up to 1800 feet may be ordered.

Getting started

The Acutime Gold Starter Kit makes it easy to evaluate the exceptional performance of this GPS smart antenna and integrate state-of-the-art technology into your system. The Starter Kit includes the Acutime Gold GPS smart antenna (RS-422), a 100' interface cable, user guide, RS-422 to USB converter, and a Windows software tool for monitoring and communication.

Acutime Gold Technical Data

Physical Characteristics :

Dimensions:

3.74" D, 2.85" H (95mm x 72.5mm)

Weight:

5.4 oz (154 g)

Connector:

12-pin round, waterproof

Mounting:

1"-14 straight thread or 3/4" pipe thread

Mechanical drawing:

Performance Specifications :

General:

L1 frequency, C/A code (SPS), continuous tracking receiver, static overdetermined clock mode (default).

Update Rate:

1Hz

Accuracy:

Horizontal Position :

<6 meters (50%)
<9 meters (90%)

Altitude Position :

<11 meters (50%)
<18 meters (90%)

Velocity

0.06 m/s

Time to First Fix
(no stored position):

<46 seconds (50%)
<50 seconds (90%)

Time to First PPS:

<14 seconds (50%) (stationary with stored position, e.g., recovery after power outage)
<18 seconds (90%) (stationary with stored position, e.g., recovery after power outage)

Re-acquisition:

<2 seconds (90%) (after 60 second signal loss)

Dynamics:

Velocity: 500 m/sec maximum
Acceleration: 4g (39.2 m/sec² )
Jerk: 20 m/sec³

PPS output

Physical Interface: RS-422
Width: 10 microseconds (default). User-programmable from 10 microseconds to 500 milliseconds.
On-Time Edge: Rising edge on-time (default). User-programmable rising or falling.
Resolution: 80 nanoseconds (quantization error reported through TSIP)
Accuracy (one sigma):

UTC ±15 nanoseconds (static)
UTC ±90 nanoseconds (dynamic, TDOP <3)

External Event Capture

Interface: RS-422
Resolution: 488 nanoseconds

Minimum Pulse Width:

10 microsecond, rising edge on-time

Reporting Mechanism:

TSIP Packet

Electrical Specifications :

Prime power:

+5 VDC* to +36 VDC, reverse polarity protection

Power consumption:

50mA @ 12 volts, 0.6 watts (typical), <1watts max
* reduced cable length @ +5VDC to +12VDC

Serial Protocols :

Port	Interface	Protocols	Defaults
TxB(primary)	RS-422	TSIP, NMEA	TSIP @ 9600, 8-odd-1
RxB(primary)	RS-422	TSIP	TSIP @ 9600, 8-odd-1
TxA(secondary)	RS-422	TSIP	TSIP @ 9600, 8-odd-1
RxA(secondary)	RS-422	Event	Event

All ports support baud rates of 4800–115200; 8 data bits; even, odd, no parity

NMEA messages :

GGA, GLL, VTG, GSV, GSA, ZDA, RMC

Environmental Specifications:

Operating temp:

–40 to +85° C

Storage temp:

–55 to +105° C

Vibration:

0.008 g²/Hz - 5 Hz to 20 Hz
0.05 g²/Hz - 20 Hz to 100 Hz
–3dB/octave - 100 Hz to 900 Hz

Operating Humidity:

95% RH, non-condensing @ 60° C

EMC:

CE, FCC Class B