Acer S60 User Manual download pdf (Page 6)

AQ-300 Operating Manual

AQ Max Technology Inc. 6F-2, No.90, Sec.1, Chung-Hwa East Rd, Tainan, Taiwan

Fax: ++886 6 2380861 E-Mail: info@aqmax.com Web: www.aqmax.com

Operational

characteristics

Initialization

As soon as the initial self-test is complete, the AQ-300 begins the

process of satellite acquisition and tracking automatically. Under

normal circumstances, it takes approximately 45 seconds to achieve a

position fix, 38 seconds if ephemeris data is known. After a position fix

has been calculated, information about valid position, velocity and time is

transmitted over the output channel.

The AQ-300 utilizes initial data, such as last stored position, date,

time and satellite orbital data, to achieve maximum acquisition

performance. If significant inaccuracy exists in the initial data, or the

orbital data is obsolete, it may take more time to achieve a navigation

solution. The AQ-300 Auto-locate feature is capable of automatically

determining a navigation solution without intervention from the host

system. However, acquisition performance can be improved when the

host system initializes the AQ-300 in the following situation:

1) Moving further than 1,500 kilometers.

2) Failure of data storage due to the inactive internal memory battery.

Navigation

After the acquisition process is complete, the AQ-300 sends valid

navigation information over output channels. These data include:

1) Latitude/longitude/altitude

2) Velocity

3) Date/time

4) Error estimates

5) Satellite and receiver status

The AQ-300 sets the default of auto-searching for real-time differential

corrections in RTCM SC-104 standard format, with the message types 1,

5, or 9. It accomplishes the satellite data to generate a differential

(DGPS) solution. The host system, at its option, may also command

the AQ-300 to output a position whenever a differential solution is

available.

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Acer S60 User Manual Page 6