Garmin DGPS 53 사용 설명서 및 참조 설명서 - 페이지 23

{카테고리_이름} Garmin DGPS 53에 대한 사용 설명서 및 참조 설명서을 온라인으로 검색하거나 PDF를 다운로드하세요. Garmin DGPS 53 32 페이지. Integrated gps/dgps receiver
Garmin DGPS 53에 대해서도 마찬가지입니다: 소유자 매뉴얼 (32 페이지), 사양 (2 페이지)

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Sources of Error

Using a DGPS Beacon Receiver with your existing

GPS Receiver can provide substantial improvements in

accuracy; however, there may be occasions when the best

possible accuracy will not occur. Several factors can

contribute to a degraded DGPS accuracy.

Loss of DGPS Beacon Signal— Obviously, the lack

of DGPS correction data will result in reduced accuracy.

Accuracy will be the same as if no beacon receiver was

being used. Several conditions can cause a loss of the

beacon signal:

• Poor data exchange between DGPS receiver and the

GPS receiver can result in intermittent or

nonexistent correction data.

• The range of a DGPS beacon transmitter (see the

accompanying Beacon Reference Card) is typically

a few hundred miles, or less. Beyond this range,

the beacon signal cannot be reliably received.

• Interference to the beacon signal can be experi-

enced during periods of thunderstorm activity.

Other sources of interference, such as alternator

motors, ignition systems and VHF, can also affect

signal reception. Alternator/ignition interference can

be minimized through proper shielding of the ship' s

wiring, by using an EMI/RFI filter, and by mounting

the beacon receiver' s antenna away from these

sources of interference.

Multipath— Multipath error occurs when the GPS

signal is reflected before it reaches the GPS receiver. The

reflected signal takes slightly longer to reach the GPS

receiver than a non-reflected signal. This added time delay

results in position error. (The distance to each satellite is

calculated based upon the time it takes the GPS signal to

reach the GPS receiver.) Multipath error can be minimized

by mounting the GPS antenna at a location which

minimizes the potential for reflected signals. Generally,

the GPS antenna should be mounted on a large, flat

horizontal surface and away from any vertical structure

(cabin walls, large mast, etc.) which could reflect the GPS

signal.

Reference

Sources of

Error