Teejet RX375P Receiver User Manual download pdf (Page 10)

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RX375P

DIFFERENTIAL OPERATION

The Radio Technical Commission of Marine services (RTCM) has a

differential service intended for correction services. This includes the

Space Based Augmentation Systems (SBAS), such as the Wide Area

Augmentation System (WAAS) and the European Geo-stationary

Navigation Overlay System (EGNOS). The RX375P is compatible with

each of these differential services in addition to e-Dif.

SBAS

The SBAS enabled RX375P operates automatically anywhere within

the coverage areas of WAAS, EGNOS, or other SBAS programs.

The Basics

WAAS is a free services of the FAA that allows regular GPS positions

to be improved to a DGPS level of accuracy. Tests using an RX375P

have shown better than 3 ft (1 m) accuracy. WAAS is available

everywhere in the United States, including Alaska, Hawaii, and Puerto

Rico. It can also be picked up in some of the border areas of Mexico

and Canada. There are no subscription charges incurred when using

WAAS. EGNOS is a similar service that is available in Europe and

Western Russia.

Automatic SBAS Tracking

The RX375P will automatically scan and track the satellite signals. This

automatic tracking allows the operator to focus on other aspects of

differential operation without the need to tune the receiver. The RX375P

features two-channel SBAS tracking that provides an enhanced ability

to maintain a lock on a SBAS satellite when more than one satellite is

in view. This redundant tracking approach results in more consistent

tracking of an SBAS signal when in an area where signal blockage of a

satellite is possible.

e-Dif

An RX375P that is equipped with e-Dif capabilities can operate

anywhere in the world where normal GPS signals can be viewed.

e-Dif can be used anywhere on the globe where a GPS lock can be

achieved. e-Dif was developed for customers who are not able to

receive other types of differential signals due to location or budget.

e-Dif requires a subscription. Once the e-Dif capable RX375P

computes a differential correction, the user can operate for unlimited

time and provide good relative accuracy. Alternatively, the operator can

regularly update e-Dif to maintain absolute accuracy (typically less than

3 ft (1 m) over 40 minutes).

APPENDIX A  TROUBLESHOOTING

The following table provides a checklist to troubleshoot common

problems and their solutions for the RX375P.

Table 7: Troubleshooting

Problem Possible Solution

Receiver fails to

power

• Verify polarity of power leads

• Check integrity of power cable connections

• Check power input voltage (7 - 32 VDC)

• Check current restrictions imposed by

power source

(maximum is 250 mA)

No data from

RX375P

• Check receiver power status (LED)

• Check integrity and connectivity of power

and data cable connections

• The volume of data requested to be output

by the RX375P could be higher than what

the current baud rate supports. Try using

19,200 or higher as the baud rate for all

devices.

No GPS lock

• Check integrity of cable connections

• Verify RX375P’s unobstructed view of the

sky

No SBAS lock

• Check integrity of cable connections

• Verify RX375P’s unobstructed view of the

sky

• Check SBAS visibility map

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Teejet RX375P Receiver User Manual Page 10

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