MDEV-GPS-RM datasheet(18/27 Pages) LINX

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EASYTM Ephemeris Prediction

EASY™ is a function to generate orbit predictions for faster cold and warm

starts. It does this without the need for Internet connectivity or assistance

from the host processor. The predictions are good for up to 3 days and are

automatically updated when the module obtains a good position fix.

Figure 34 shows the Type values.

The Enable field is 0 to disable or 1 to enable. It is not used in a query.

The response to a set command is a standard acknowledgement packet.

EASYTM is enabled by default. This is only supported with a 1Hz NMEA

output rate.

The following show examples of this command.

Enable prediction:

$PMTK869,1,1*35<CR><LF>

Response:

$PMTK001,869,3*37<CR><LF>

Disable prediction:

$PMTK869,1,0*34<CR><LF>

Response:

$PMTK001,869,3*37<CR><LF>

Query prediction:

$PMTK869,0*29<CR><LF>

Disabled response:

$PMTK869,2,0*37<CR><LF>

Enabled response:

$PMTK869,2,1*36<CR><LF>

EASYTM Ephemeris Prediction Command and Response

Write Message

Start

Msg ID

Type

Enable

Checksum

End

$PMTK

869

,Type

,Enable

*Cksum

Figure 33: Ephemeris Prediction Command and Response

Ephemeris Prediction Type Values

Value

Description

Query the current state of prediction (enabled or disabled)

Set the state of prediction

Result of a query

Figure 34: Ephemeris Prediction Type Values

Typical Applications

Figure 35 shows the RM Series GPS receiver in a typical application using

a passive antenna.

A microcontroller UART is connected to the receiver’s UART for passing

data and commands. A 3.3V coin cell battery is connected to the

VBACKUP line to provide power to the module’s memory when main

power is turned off.

Figure 36 shows the module using an active antenna.

A 300

Ω ferrite bead is used to put power from VOUT onto the antenna line

to power the active antenna.

1PPS

GND

LCKIND

GND 20

RFIN 19

GND 18

VOUT 17

NC 16

GND 22

NC 15

NC 14

NC 13

VCC 12

VBACKUP 11

µP

GND

VCC

GND

VCC

GND

VCC

GND

300Ω

Ferrite Bead

RESET

GND

1PPS

GND

LCKIND

GND 20

RFIN 19

GND 18

VOUT 17

NC 16

GND 22

NC 15

NC 14

NC 13

VCC 12

VBACKUP 11

µP

GND

VCC

GND

VCC

GND

VCC

GND

RESET

GND

Figure 35: Circuit Using the RM Series Module with a Passive Antenna

Figure 36: Circuit Using the RM Series Module with a an Active Antenna

MDEV-GPS-RM Datasheet(PDF) 18 Page - Linx Technologies

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