Lassen SQ, Reference Manual

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Lassen SQ GPS Receiver 5
Starter Kit 1
1.3
Receiver Performance
The Lassen SQ GPS receiver is a complete 8-channel parallel tracking
GPS receiver designed to operate with the L1 frequency, Standard
Position Service, Coarse Acquisition code. Using two highly
integrated Trimble custom integrated circuits, the receiver is designed
in a modular format especially suited for embedded applications
where small size and extremely low power consumption are required.
The receiver features Trimble's latest signal processing code, a high-
gain RF section for compatibility with standard 27 dB active gain GPS
antennas, and a CMOS TTL level pulse-per-second (PPS) output for
timing applications or for use as a general purpose synchronization
signal.
The Lassen SQ GPS receiver acquires a position fix with minimal
delay after power cycling. The battery back-up RAM is used to keep
the Real Time clock (RTC) alive, and to store the following:
• Almanac
• Ephemeris
• Last position
User settings such as port parameters and NMEA settings can be
stored in the receiver’s non-volatile (Flash) memory. These settings
are retained without application of main power or battery back-up
power.
The Lassen SQ GPS receiver has a single configurable serial I/O
communication port.
Warning – When customizing port assignments or characteristics,
confirm that your changes do not affect your ability to communicate with
the receiver (see Chapter 3, Software Interface).