Novatel OM-20000077 사용자 설명서

The input range for a SUPERSTAR II card is either 3.3 VDC or 5 VDC depending on your model. The input 
range required for the FlexPak-SSII is +6 to +18 VDC.

The FlexPak receiver is waterproof. The SUPERSTAR II bare card must be mounted in a dry location. Locate 
your receiver where it is convenient for cables to run to the power source, display device, and antenna. Form 
drip loops in the cables to prevent moisture from running down the cables and into the receiver.

Mount the receiver several feet away from radio transmission equipment.

Many GPS reception problems can be reduced, to some degree, by careful antenna site selection. Of primary 
importance is to place the antenna so that unobstructed line-of-sight reception is possible from horizon to 
horizon and at all bearings and elevation angles from the antenna. This is, of course, the ideal situation, which 
may not be possible under actual operating conditions.

1. Try to place the antenna as far as possible from obvious reflective objects, especially reflective 

objects that are above the antenna’s radiation pattern horizon. Close-in reflections cause strong 
multipath signals. For a detailed discussion on multipath and site selection, see Section G.4, 
Multipath starting on Page 71.

2. Care should also be taken to avoid coiling the antenna cable around the mounting base and 

pinching the antenna cable in window or door jambs.

By default, the SUPERSTAR II uses satellites above 4.5 degrees elevation. The mask angle can be set to use a 
different cut-off, as low as zero degrees (all in view), using Message ID# 81, Set Mask Angle (refer to the L1 
GPS Firmware Reference Manual for more message details).

 Your receiver must be a BASE model to act as a base station. A list of models is in Appendix A of the L1 

GPS Firmware Reference Manual and in our Price List available from the Sales side menu of our website 
at 

www.novatel.com

.

1. The base station must be located on a site that is above all obscuring elements on the surrounding 

terrain in order to have all satellites above the horizon visible at the base station’s antenna. The 
intent is to have all satellites that are visible at the roving unit’s antenna to be visible at the base 
station as well.

2. Multipath interference must be minimized as much as possible. Multipath is defined as the 

interaction of the GPS satellite signal and its reflections. This causes errors mainly on the GPS 
code, and less so on the GPS carrier. Even though the receiver uses carrier phase measurements, it 
can revert to code differential GPS operation if carrier phase differential GPS cannot be 
performed. Hence, the base station’s antenna must be far from any reflecting elements.

3. The position of the base station’s antenna must be surveyed using appropriate surveying 

equipment. This position must then be programmed in the base station using Message ID# 80, Set 
User’s Position/Operating Mode (refer to the L1 GPS Firmware Reference Manual). Any error in 
the base station’s position will be reflected in the roving unit’s computed position.