Справочник Пользователя для Trimble Outdoors SPSX51

SPSx51 Modular GPS Receivers User Guide     1 79

Pulse-per-second. Used in hardware timing. A pulse is generated in conjunction with a 
time stamp. This defines the instant when the time stamp is applicable.

A file that contains orbit information on all the satellites, clock corrections, and 
atmospheric delay parameters. The almanac is transmitted by a GPS satellite to a GPS 
receiver, where it facilitates rapid acquisition of GPS signals when you start collecting 
data, or when you have lost track of satellites and are trying to regain GPS signals.

The orbit information is a subset of the 

 data.

AutoBase technology uses the position of the receiver to automatically select the 
correct base station; allowing for one button press operation of a base station. It 
shortens setup time associated with repeated daily base station setups at the same 
location on jobsites.

Also called reference station. A base station in construction, is a receiver placed at a 
known point on a jobsite that tracks the same satellites as an RTK rover, and provides 
a real-time 

 message stream through radio to the rover, to obtain 

centimeter level positions on a continuous real-time basis. A base station can also be a 
part of a virtual reference station network, or a location at which GPS observations are 
collected over a period of time, for subsequent postprocessing to obtain the most 
accurate position for the location.

BInary EXchange format. BINEX is an operational binary format standard for 
GPS/

 research purposes. It has been designed to grow and allow 

encapsulation of all (or most) of the information currently allowed for in a range of 
other formats. 

An Internet server that manages authentication and password control for a network of 

 servers, and relays VRS corrections from the VRS server that you select.

A radio wave having at least one characteristic (such as frequency, amplitude, or phase) 
that can be varied from a known reference value by modulation.

The frequency of the unmodulated fundamental output of a radio transmitter. The GPS 
L1 carrier frequency is 1575.42 MHz.

Is the cumulative phase count of the GPS or GLONASS carrier signal at a given time.

A wireless adaptor that connects a laptop computer to a cellular phone system for data 
transfer. Cellular modems, which contain their own antennas, plug into a PC Card slot 
or into the USB port of the computer and are available for a variety of wireless data 
services such as GPRS.

Compact Measurement Record. A real-time message format developed by Trimble for 
broadcasting corrections to other Trimble receivers. CMR is a more efficient 
alternative to 

.

A statistical measure of the variance of two random variables that are observed or 
measured in the same mean time period. This measure is equal to the product of the 
deviations of corresponding values of the two variables from their respective means.