Rainbow Electronics MG260 - Manual (Page 10)

MG260 Product Specification
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agreement.
1 References
1.1 Glossary
Term Definition
Performing a FIX Means the GPS receiver is able to compute a position
Dead reckoning GPS Feature that allows navigation with poor/no satellites view by the
aid of external sensors that provide course (odometer) and heading
(gyroscope).
Single Coax FLYFOT concept that allows the user to use only one single coaxial
cable for both GSM and GPS RF signal to connect the MG260 module
to the antennas.
The antennas are most of the time physically distinct but connected to
the MG260 module by a single coaxial cable through an antenna switch
system, saving a second coaxial cable.
Cold Start Powering up a unit after it has been turned off for an extended period of
time and no longer contains current ephemeris data. In Cold Start
Scenario, the receiver has no knowledge on last position, approximate
time or satellite constellation. The receiver starts to search for signals
blindly. This is normal behavior, if no backup battery is connected. Cold
Start time is the longest startup time for GPS receivers and can be
several minutes.
Hot Start Start mode of the GPS receiver when current position, clock offset,
approximate GPS time and current ephemeris data are all available. In
Hot Start Scenario, the receiver was off for less than 2 hours. It uses its
last Ephemeris data to calculate a position fix.
Warm Start Start mode of a GPS receiver when current position, clock offset and
approximate GPS time are known. Almanac data is retained, but the
ephemeris data is cleared. In Warm Start Scenario, the receiver knows
- due to a backup battery or by other techniques – his last position,
approximate time and almanac. Thanks to this, it can quickly acquire
satellites and get a position fix faster than in cold start mode.
Coarse Acquisition
Code (C/A Code)
The standard positioning signal the GPS satellite transmits to the
civilian user. It contains the information the GPS receiver uses to fix its
position and time. Accurate to 24 meter.This code is a sequence of
1023 pseudorandom binary biphase modulations on the GPS carrier
(L1) at a chipping rate of 1.023 MHz, thus having a code repetition
period of 1 millisecond. The code was selected to provide good
acquisition properties. Also known as the "civilian code.”