CTL-410 Series
GPS Time & Frequency Unit
Ultra High Sensitivity Assisted
GPS Technology
Ultra high sensitivity assisted GPS technology
PRODUCT OVERVIEW
KEY FEATURES
The CTL410 series of GPS Time and Frequency units are
designed for where a compact low cost source of highly
accurate time and frequency is required, and includes an
OCXO oscillator.
GPS disciplined OCXO oscillator
DATASHEET
The CTL410 series utilizes the very latest state of the art
GPS technology that allows ultra high sensitivity satellite
tracking to levels as low as –160dBm. This low level signal
capability can enable GPS timing in very weak signal areas
such as under dense foliage, in severe urban canyons and
even inside buildings. This high sensitivity is useful for
applications such as GSM or WiMAX network
synchronization, and alternatively for easier, lower cost
antenna installation (as the antenna does not need to
have a clear view of the sky and can therefore be easier to
install).
The CTL410 series has a standard 10MHz output
frequency, but can be specified with a variety of additional
secondary frequencies. The OCXO oscillator can be
configured to be disciplined by the embedded GPS
receiver, or to be allowed to free run following GPS
calibration.
The CTL410 series can also be configured with a
2.048Mbps output option.
Other features of the CTL410 series include the capability
of the unit to perform a self survey and enter a fixed
position mode of operation. This allows GPS timing with
only one satellite being tracked as low as –160dBm
thereby greatly extending the ability of the unit to output
GPS steered time and frequency and reducing holdover
requirements. In addition, the unit will autonomously
scale the self survey window based on initial reported GPS
position to allow entry into fixed position mode even in
very weak signal areas.
GPS World from Chronos Technology
CTLds086 v1.1 Feb2011
Low power, small form factor
Ultra high GPS sensitivity
Easier antenna location
<1E-12 frequency accuracy
30ns RMS timing accuracy
Achieves ITU/ETSI PRC MTIE mask
Self survey and single satellite timing capability
10MHz and 1pps synchronized to GPS
2.048Mbps output option
10MHz phase aligned to 1pps
Available with additional output frequencies
Assisted GPS capability
Outputs GPS assist data to act as a server to other
CTL410 units

Outputs GPS assist data to act as a server to other CTL430
CTL-410 Series
GPS Time & Frequency Unit
The CTL410 series will either work in stand alone mode whereby the GPS receiver will autonomously achieve satellite lock in good signal areas, or will accept GPS assist data to allow satellite lock in extremely poor signal areas. GPS
assist data can be received via the RS232 serial port from a GPS assist server or other CTL410 unit located elsewhere
in the network (the CTL410 will act as a GPS assist server to other CTL410 units).
Specification
INDUSTRIAL GNSS APPLICATIONS
Physical
PCB Size:
100 x 160mm
Inputs
Antenna:
Antenna Power:
Voltage:
SMA
+5 filtered and current limited
9-36V DC
Note 1
The 10MHz output frequency can be specified
with a square wave or sine wave format. As well
as the standard 10MHz output frequency, there is
also the option to specify two additional
secondary output frequencies that are locked to
GPS
Outputs
Frequency:
1pps
Serial Port:
Alarm:
Data Output:
Data Output:
Data Input:
Data Input:
10MHz CMOS (Note1)
TTL
RS232-C
dry relay contact
NMEA0183 (including Time of Day)
GPS assist data (Note 2)
Control commands
GPS assist data
Note 2
To allow a first fix under very poor signal
conditions, the unit will accept external GPS assist
into the RS232 port. The unit will also output any
GPS assist data autonomously downloaded from
visible satellites to be used by other CTL410 series
units in a network. (GPS assist data includes
satellite almanac, ephemeris, TOD, etc and allows
a rapid GPS fix in signal areas below –143dBm)
GPS
Frequency:
Sensitivity:
Sensitivity:
L1 1575.42MHz 12 channels
-159dBm acquisition (A-GPS)
-160dBm tracking
Timing Accuracy
1pps:
1pps:
30ns RMS (clear view of sky)
<1us (weak signal strength)
(Note 3)
Frequency Accuracy:
10MHz:
<1E-12 (24 hour average)
10MHz:
Achieves ITU/ETSI PRC MTIE
Holdover:
10MHz:
Note 3
With a clear view of the sky, the CTL410 series
units will provide 30ns RMS timing accuracy. In
areas of very weak GPS signals, the timing
accuracy can degrade out to levels of <1us due to
signal multipath. Such multipath will also degrade
the short term frequency accuracy
Note 4
The CTL410 can be specified with a variety of
different OCXO types, such that specific holdover
and phase noise parameters can be defined
(Note 4)
Phase Noise: -145dBc/Hz @ 1KHz typical
(Note 4)
Environmental
Operating Temp:
Storage Temp:
Humidity:
-10degC to +75degC
-40degC to +100degC
90% non-condensing
Chronos Technology Limited Stowfield House Upper Stowfield Lydbrook Gloucestershire GL17 9PD UK
Tel: +44 (0)1594 862200 Email: sales@chronos.co.uk www.chronos.co.uk www.gps-world.biz