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| 型号： | RXM-GPS-SG-T |
| 厂商： | Linx Technologies Inc |
| 文件页数： | 3/17页 |
| 文件大小： | 0K |
| 描述： | GPS MODULE SMD SIRF |
| 产品变化通告： | RXM-GPS-SG Receiver Change 19/Apri/2010 RXM-GPS-SG Receiver Update 14/Jun/2010 |
| 标准包装： | 1,000 |
| 系列： | SG |
| 封装/外壳： | 模块 |
| 供应商设备封装： | 模块 |
| 包装： | 散装 |
PIN ASSIGNMENTS
A BRIEF OVERVIEW OF GPS
The Global Positioning System (GPS) is a U.S.-owned utility that freely and
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6
7
8
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10
NC
NC
1PP S
TXA
RXA
GND
GPIO10
LCKIND
GPIO1
RFPWRUP
ON_OFF
GND
RFIN
GND
VOUT
NC
GND
GPIO13
GPIO15
GPIO14
VCC
VBACKUP
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17
16
22
15
14
13
12
11
continuously provides positioning, navigation, and timing (PNT) information.
Originally created by the U.S. Department of Defense for military applications,
the system was made available without charge to civilians in the early 19 8 0s.
The global positioning system consists of a nominal constellation of 24 satellites
orbiting the earth at about 12,000 nautical miles in height. The pattern and
spacing of the satellites allow at least four to be visible above the horizon from
any point on the Earth. Each satellite transmits low power radio signals which
contain three different bits of information; a pseudorandom code identifying the
satellite, ephemeris data which contains the current date and time as well as the
satellite’s health, and the almanac data which tells where each satellite should
Figure 2: SG Series Receiver Pinout (Top View)
be at any time throughout the day.
PIN DESCRIPTIONS
Pin # Name I/O
Description
A GPS receiver such as the Linx SG Series GPS module receives and times the
signals sent by multiple satellites and calculates the distance to each satellite. If
the position of each satellite is known, the receiver can use triangulation to
1, 2, 16
3
4
5
6
7
8
9
10
NC
1PPS
TXA
RXA
GPIO10
LCKIND
GPIO1
RFPWRUP
ON_OFF
–
O
O
I
I/O
O
I/O
O
I
No Connect. No electrical connection.
Pulse per second (1uS pulse)
Serial output for channel A (default NMEA)
Serial input for channel A (default NMEA)
General Purpose I/O
Lock Indicator
General Purpose I/O, 100k Ω pull down
Indicate power state
Edge triggered soft on/off request. Should only be
used to wake up the module when the RFPWRUP line
determine its position anywhere on the earth. The receiver uses four satellites to
solve for four unknowns; latitude, longitude, altitude, and time. If any of these
factors is already known to the system, an accurate position (Fix) can be
obtained with fewer satellites in view. Tracking more satellites improves
calculation accuracy. In essence, the GPS system provides a unique address for
every square meter on the planet.
A faster Time To First Fix (TTFF) is also possible if the satellite information is
already stored in the receiver. If the receiver knows some of this information,
then it can accurately predict its position before acquiring an updated position fix.
For example, aircraft or marine navigation equipment may have other means of
determining altitude, so the GPS receiver would only have to lock on to three
satellites and calculate three equations to provide the first position fix after
power-up.
TTFF is often broken down into three parts:
is low.
Cold: A cold start is when the receiver has no accurate knowledge of its position
or time. This happens when the receiver’s internal Real Time Clock (RTC) has
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1 3
14
15
17
1 8 ,20-22
VBACKUP
VCC
GPIO14
GPIO15
GPIO1 3
VOUT
GND
P
P
I/O
I/O
I/O
P
P
Backup battery supply voltage. This line must be
powered to enable the module.
Supply Voltage
General Purpose I/O, 100k Ω pull up
General Purpose I/O, 100k Ω pull up
General Purpose I/O
2. 8 5V Linear regulator power output
Ground
not been running or it has no valid ephemeris or almanac data. In a cold start,
the receiver takes 3 5 to 40 seconds to acquire its position. If new almanac data
is required, this may take up to 15 minutes (see page 9 for more details).
Warm or Normal: A typical warm start is when the receiver has valid almanac
and time data and has not significantly moved since its last valid position
calculation. This happens when the receiver has been shut down for more than
2 hours, but still has its last position, time, and almanac saved in memory, and
its RTC has been running. The receiver can predict the location of the current
visible satellites and its location; however, it needs to wait for an ephemeris
broadcast (every 3 0 seconds) before it can accurately calculate its position.
Hot or Standby: A hot start is when the receiver has valid ephemeris, time, and
almanac data. This happens when the receiver has been shut down for less than
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RFIN
I
GPS RF signal input
2 hours and has the necessary data stored in memory with the RTC running. In
a hot start, the receiver takes 1 to 2 seconds to acquire its position. The time to
calculate a fix in this state is sometimes referred to as Time to Subsequent Fix
or TTSF.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| RXM-GPS-SR-B | 功能描述:GPS模块 GPS Receiver with Integrated Antenna RoHS:否 制造商:Linx Technologies 频带:1.575 GHz 通道数量:20 首次定位时间（冷启动）:35 s 获取敏感性:- 144 dBm 水平位置精确度:10 m 工作电源电压:3 V to 4.2 V 工作电源电流:46 mA 接口类型:Serial 最大工作温度:+ 85 C 安装风格:SMD/SMT 尺寸:15 mm x 13 mm x 2.2 mm |
| RXM-GPS-SR-T | 功能描述:GPS模块 GPS Receiver with Integrated Antenna RoHS:否 制造商:Linx Technologies 频带:1.575 GHz 通道数量:20 首次定位时间（冷启动）:35 s 获取敏感性:- 144 dBm 水平位置精确度:10 m 工作电源电压:3 V to 4.2 V 工作电源电流:46 mA 接口类型:Serial 最大工作温度:+ 85 C 安装风格:SMD/SMT 尺寸:15 mm x 13 mm x 2.2 mm |
| RXM-UHF | 制造商:RADIOMETRIX 制造商全称:RADIOMETRIX 功能描述:UHF Radio Telemetry Receiver Module |
| RXP0005 | 制造商:Panasonic Industrial Company 功能描述:ARM |
| RXP0014 | 制造商:Panasonic Industrial Company 功能描述:PULLEY |
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