Справочник Пользователя для MPC OM-20000072

The L1L2W model of the MPC is equipped with the WAAS/EGNOS option. The ability to
simultaneously track two WAAS satellites, and incorporate the WAAS/EGNOS corrections into the
position, is available in this model.

This model can output the WAAS data in log format (RAWWAASFRAMEA/B, WAAS0A/B-
WAAS27A/B), and can incorporate these corrections to generate differential-quality position
solutions. Standard WAAS/EGNOS data messages are analyzed based on RTCA standard DO-229B
Change 1 Minimum Operational Performance Standards for GPS/WAAS airborne equipment.

A WAAS/EGNOS-capable MPC will permit anyone within the area of coverage to take advantage of
its benefits. 

The command WAASCORRECTION, enables the use of the WAAS corrections in the position filter. 
In order to use this command, first ensure that your receiver is capable of receiving WAAS 
corrections.

Several WAAS specific logs also exist and are all prefixed by the word WAAS except for the 
RAWWAASFRAME log.

The PSRDIFFSOURCE command sets the station ID value which identifies the reference station from 
which to accept psuedorange corrections. All DGPS types may revert to WAAS, if enabled using the 
WAASCORRECTION command.

Consult Volume 2 of the OEM4 Users’ Guide for more details on individual WAAS commands and 
logs.

Wide-area

Reference Station

(WRS)

Master Station

(WMS)

Ground Uplink

Station

(GUS)

Wide-area

Integrity data,
differential corrections,
time control, and status

Geostationary
Satellite (GEO)

GPS User

GPS Satellite
Constellation

Integrity data,
differential corrections,
and ranging control

L1

C-band

L1 & L2

Reference Station

(WRS)

Wide-area

Reference Station

(WRS)

Wide-area

L1 & C-band