Ashtech Z-sensor Specifikace stáhnout pdf (Strana 111)

Command/Response Formats 91

Commands

user to select the tracking loop parameters based on the application. The receiver uses

default values until another setting is selected. The user settings are saved in battery-

backed memory if the $PASHS,SAV,Y command is issued afterwards and are used

until a new setting is selected, or the memory is cleared. The default is 1, 2, 3.

Example: Change loop parameters to ratio of 0.2, and carrier bandwidth of 10 Hz

$PASHS,LPS,2,1,3 <enter>

$PASHQ,LPS,c

Query tracking loop setting, where c is the optional output port and is not required to

direct the response to the current port.

$PASHR,LPS

The response is in the form

$PASHR,LPS,d1,d2,d3*cc <enter>

where d1-d3 are as described in Table 6.18 on page 91.

LTZ: Set Local Time Zone

$PASHS,LTZ,d1,d2

Set local time zone value, where d1 is the number of hours that should be added to the

local time to match GMT time and d2 is the number of minutes; minutes have the

same sign as d1. The d1 value is negative for east longitude, and the range is 0 to 13.

The setting is displayed by NMEA message ZDA.

Example: Set local time zone to East 7 hours, 20 minutes

$PASHS,LTZ,-7,-20 <enter>

Table 6.18: LPS Message Structure

Parameter Description Range

d1 3rd order loop ratio 00 - 10

0- 2nd order only

1 - ratio of 0.1 (low acceleration)

..................

10 - ratio of 1 (high acceleration)

d2 Carrier loop parameter (related to the noise

bandwidth of the loop)

0 = 10 Hz (static)

0 = 25 Hz (low dynamics)

0 = 50 Hz (high dynamics)

d3 Code loop parameter (related to the noise

bandwidth of the loop)

0 = 0.2 Hz

1 2 ... 106 107 108 109 110 111 112 113 114 115 116 ... 261 262

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Ashtech Z-sensor Specifikace Strana 111