C Technologies Mobile Information Collector C-Pen Bedienungsanleitung PDF herunterladen (Seite 18)

Manufacturer

DGPS Receivers

Ashtech

408-524-1400

http://www.ashtech.com

Communication Systems International Inc. (CSI)

403-259-8311

http://www.csi-dgps.com

Photo

Model

Z-Surveyor ABX

MBX

GBX

LGBX

Correction Type

beacon

beacon/satellite

Correction Service

USCG

CSI

CSI/Omnistar

GPS Engine

Ashtech Z-12

none none Ashtech G-L12

Ashtech G-12L

GPS Channels

N/A

N/A 8-12

Size (mm)

76 x 185 x 210

150 x 125 x 51

150 x 125 x 51 242 x 125 x 51

Weight (kg)

1.7

0.54

0.64

1.1

Receiver Price

$1,620-$3,060

Service Price

Accuracy

<1 m

N/A

2-5m

1-3m

Power Req.

10 - 28 VDC

9-16 VDC

DGPS Receivers

Differential GPS or DGPS refers to differentially correcting data while they are received. C/A code GPS

receivers can be combined with radio beacon or satellite receivers that collect correction data via radio

broadcasts. The US Coast Guard (USCG) has set up network of radio beacons throughout the country that

continuously broadcast correction signals; this service is free of charge to the general population. Radio

beacon coverage is constantly being upgraded and the USCG provide up to date status of its beacon sites on

their Internet site at http://www.navcen.uscg.mil/ADO/DgpsSelectStatus.asp.

Several companies also provide correction services either by radio beacon or satellite. Private radio beacon

correction services have a limited coverage that tends to concentrate around large urban areas, where the

service providers have the most customers. Satellite correction services generally offer coverage throughout

the United States. A wider coverage is obtained because radio signals containing correction data are

broadcast from ground base stations up to a series of geosynchronous satellites that rebroadcast the signals

back down to earth.

Most DGPS receivers contain both the radio and GPS receivers in the same box, which is either carried in a

backpack or mounted in a vehicle. Several products act only as a radio beacon receiver and must be used in

conjunction with an existing GPS receiver.

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