W2SG0084i-T Wi2Wi, W2SG0084i-T Datasheet - Page 10

• Manufacturer Part Number: W2SG0084i-T
• Description: GPS Modules GPS SiRFstar IV Module SMD
• Manufacturer: Wi2Wi

Specifications of W2SG0084i-T

• Rohs: yes
• Frequency Band: 1.575 GHz
• Number Of Channels: 48
• Time To First Fix (cold Start): 45 s
• Acquisition Sensitivity: - 148 dBm
• Horizontal Position Accuracy: 5 m
• Operating Supply Voltage: 1.8 V, 3.3 V
• Operating Supply Current: 50 ma
• Interface Type: UART
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Dimensions: 11.2 mm x 12 mm x 2.5 mm
• Minimum Operating Temperature: - 40 C

valid navigation solution which consists of five satellite vehicles, the rising edge of each
TMARK pulse is synchronized with the UTC one second epochs to within ±1 microsecond.
The receiver software produces a binary format data message containing the UTC time
associated with each time mark pulse. The relationship between the UTC Time Mark Pulse
Output message and the TMARK pulse is shown in Figure x. When the receiver’s serial data
communication port is set to 9600 bps, the UTC Time Mark Pulse Output message precedes
the TMARK pulse by xxx milliseconds (typically). The TMARK pulse waveform is shown in
Figure x. This signal is a positive logic, buffered CMOS level output pulse that transitions
from a logic “low” condition to a logic “high” at a 1 Hz rate. The TMARK output pulse rise
time is typically less than 2 nanoseconds and the pulse duration is typically 200 milliseconds.
Patch Option:
A patch exists that allows the Time Mark to output the 1 PPS with only four satellite vehicles
instead of the default of five satellites. This patch can be downloaded from the Wi2Wi
Extranet and implemented with the GPS patch manager that will run on Windows 7
Linux operating systems. Please register at
3.3
To enable GPS or to turn off GPS a positive pulse for two RTC ticks (62uS) after the Receiver
has stabilized after a Fix.
that comes out when the receiver is receptive to commands.
4
4.1
Differential GPS (DGPS) is traditionally used with the fix of three to four satellites and the
secondary fix from ground based GPS receiver based stations that retransmit the secondary fix
via VHF/UHF and occasionally FM. DGPS can achieve positional accuracies of between 60
cm ~ 10 cm’s. See Figure 4
Figure 4 Traditional DGPS System
WAAS with SBAS or Wide Area Differential GPS
GPS Power On/Off
Differential GPS
This can be verified with a message ID 18, called “OK to Send”,
Copyright © 2011 Wi2Wi, Inc.
www.wi2iw.com
.
Datasheet, GPS Module– W2SG0084i
Dated: November 11, 2011
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