Trimble Outdoors ACUTIME 2000 User Manual

Acutime 2000

GPS Smart Antenna for Precise Timing and Synchronization

Key Features

• Timing pulse synchro­nized to within ±100
nanoseconds (one
sigma) of UTC

• Operating temp - 40° to
+85° C

• Option of RS-422/485
or RS-232 interface

• Standard 8-channel or
premium 12-channel
option

Trimble’s new Acutime™2000
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 2000 is a pole­mounted GPS receiver and
antenna in an environmentally
sealed enclosure. The Acutime
2000’s design continues
Trimble’s line of GPS smart
antennas, which have been in
production since 1991. It is the
perfect solution for precise tim­ing and synchronization of
wireless voice and data networks
and provides a cost-effective and
independent timing source for
any application.

Once power is applied, the
Acutime 2000 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
±100 nanoseconds (one sigma),
outputting a time tag for each
pulse. The Acutime 2000’s
T-RAIM (Time-Receiver
Autonomous Integrity Monitor)
algorithm ensures PPS integrity.

Designed for long-term
reliability, the Acutime 2000
GPS smart antenna is water­resistant and weatherproof, and
has a rounded top that facili­tates run-off from the elements.

Trim ble

The Acutime 2000 is the premier time source for synchronization of wireless voice
and data networks.

OPTIONS

The Acutime 2000 is available
in a number of configurations
to suit all environments. The
standard Acutime 2000 is an
8-channel receiver; a premium
12-channel option is also
available. The interface is
available in either an
RS-422/485 (for long cable
runs required by buildings
or towers) or an RS-232.

GETTING STARTED

The Acutime 2000’s 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 2000 smart antenna,
a 100' interface cable, user
guide, RS-422 to RS-232
converter, and a Windows
software tool for monitoring
and communication.

Acutime 2000

GPS Antenna for Precise Timing and Synchronization

PHYSICAL CHARACTERISTICS

Dimensions: 6.12" D, 5.0" H (155.5mm x 127.0mm)
Weight: 12.8 oz (363 g)
Connector: 12-pin round, waterproof
Mounting: 1"-14 straight thread
Mechanical Drawing:

5.0"(127.0 mm)

6.12"

(155.5 mm)

ENVIRONMENTAL SPECIFICATIONS

Operating temp: –40 to +85°C
Storage temp: –55 to +105°C
Vibration: 0.008 g

2

/Hz 5 Hz to 20 Hz

2

0.05 g

/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

PERFORMANCE SPECIFICATIONS

General: L1 frequency, C/A code (SPS), continuous tracking

receiver. Available in 8-channel or 12-channel.

Update Rate: 1Hz
Accuracy:

Dynamic SPS (with S/A) Dynamic DGPS

Position
Velocity 0.25 m/s CEP 0.05 m/s CEP
Time to First Fix

(no stored position):

40m CEP 1.5m CEP

8-channel typical cold start: < 120 seconds
12-channel typical cold start: < 110 seconds

Time to First PPS
(stationary with stored
position, e.g., recovery
after power outage):

Re-acquisition after
60-second signal loss:

Dynamics:

Velocity:
Acceleration: 4g (39.2 m/sec
Jerk: 20 m/sec

PPS output

Physical Interface:
Width: 10 microseconds (default). User-programmable

<60 seconds

<2 seconds (90%)

500 m/sec maximum

2

)

3

RS-422

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 ±60 nanoseconds (static, without S/A)

UTC ±100 nanoseconds (static)
UTC ±300 nanoseconds (dynamic, TDOP≤3)

Trimble Navigation Limited
Corporate Headquarters
645 North Mary Avenue
Sunnyvale, CA 94086
[phone]
[phone] Fax
www.trimble.com

Trimble Navigation

Singapore PTE Limited
79 Anson Road
#05-02
Singapore 079906
[phone]
[phone] Fax

External Event Capture

Interface:

Resolution: 320 nanoseconds
Minimum Pulse Width: 1 microsecond, rising edge on-time
Reporting Mechanism: TSIP Packet

ELECTRICAL SPECIFICATIONS

Prime Power: +8 Vdc to +36 Vdc, reverse polarity protection
Power Consumption: 110mA @ 12 volts, 1.2 watts (typical), <1.5 watts max

SERIAL PROTOCOLS

Port Interface Protocols Defaults

TxB (primary)
RxB (primary) RS-422/485 or RS-232 TSIP, RTCM TSIP @ 9600, 8-odd-1
TxA (secondary) RS-422/485 or RS-232 TSIP TSIP @ 9600, 8-odd-1

RS-422/485 or RS-232

RS-422/485 or RS-232 TSIP, NMEA TSIP @ 9600, 8-odd-1

All ports support baud rates of 300–38,400; 7 or 8 data bits; even, odd, no parity

NMEA messages (default):ZDA
Available messages:GGA, GLL, VTG, GSV, GSA, ZDA, RMC

ORDERING INFORMATION

Acutime 2000 GPS Smart Antenna

8-channel, RS-422
12-channel, RS-422

8-channel, RS-232
12-channel, RS-232

Acutime 2000 Starter Kit

(includes 8-channel RS-422 Acutime 2000,

'interface cable, RS-422/232 converter,

100
Acutime Monitor software (Win 9x/2000/NT) User Guide

Acutime 2000 User Guide

Acutime 2000 interface cables

(12 conductors, 6 twisted pairs, shielded)

50'(15m)
100

'(30m)

200

'(60m)

400

'(120m)

For additional information, please visit Trimble’s website at www.trimble.com
and the Acutime 2000 product page for updates, additional tools and
current part numbers.

Trimble Navigation Europe Limited
Trimble House
Meridian Office Park
Osborne Way
Hook, Hampshire RG27 9HX U.K.
[phone]
[phone] Fax

Trimble Navigation

Australia Pty Ltd.
Level 1/123 Gotha Street
Fortitude Valley, QLD 4006
[phone]
[phone] Fax

© Copyright 2000, Trimble Navigation Limited. All rights reserved. The Trimble logo with Trimble is a trademark of Trimble Navigation Limited registered in the United States Patent and Trademark Office.

Acutime is a trademark of Trimble Navigation Limited. All other marks are the property of their respective owners. TID11820-PDF (1/00)