TeeJet RX 400p - Manual (Page 33)

RX 400p
2-1 98-05044
R1
2 RX 400p Overview
For your convenience, all internal sensors within the RX 400p feature automatic
tuning algorithms, which are in operation by default.
When powered for the first time, the RX 400p receiver will perform a ‘cold start’,
which involves acquiring the available GPS satellites in view and the WAAS
differential service.
If WAAS is not available in your area, either of the other two internal differential
sensors, the beacon or L-band receiver, may be used. The beacon receiver will scan
the beacon spectrum for the best signal, and maintain an acquisition on the best
station at all times. Should a superior station become available as you navigate with
your positioning system, the beacon sensor will automatically acquire that station.
This chapter describes the various modes of operation and features of your RX 400p
receiver and its internal sensors.
2.1 GPS Operation
The GPS engine is always operating, regardless of the DGPS mode of operation. The
following sections describe the general operation of the RX 400p’s internal GPS
engine.
2.1.1 Automatic Tracking
The GPS engine within the RX 400p automatically searches for GPS satellites,
acquires the signal, and manages the associated navigation information required
positioning and tracking. This is a hands-free mode of operation.
2.1.2 Receiver Performance
There are two main aspects of GPS receiver performance - positioning accuracy and
satellite acquisition quality.