30
ZY-12 GPS Receiver
Position Fix Parameters
Use the Position Fix Parameters screen (Figure 3.7) to specify position
computation criteria (stored and displayed) such as how many satellites to use,
when to hold altitude fixed, Dilution of Precision (DOP) masks, elevation mask,
and use of unhealthy satellites. You can also enable the ionospheric model to be
used for position computation, display computed position in Screen 2 using UTM
coordinates, and use point positioning mode.
PORT A PORT B
PORT C PORT D
Takes you to a subscreen where you can specify serial port output
parameters.
EXT FREQ
Can be accessed only if the external frequency (x) option has been loaded
into the receiver. When EXT FREQ is selected, the receiver presents a
subscreen which lets you set up the external frequency parameters.
PULSE GEN
Goes to the Pulse Generation Parameters subscreen that controls the 1PPS
output.
DATUM
Goes to the Datum Selection subscreen where you can select one of 46
possible datums to use for displaying the pseudo-range position shown on
Screen 2. Note that this datum is not used for computing the position stored
in memory.
MODEM
Lets you set up your modem for Port A, B, C, or D.
SUBCMDS
Lets you enter system-level commands.
SEC. MODUL
Lets you set a mission duration or zeroize the key
Figure 3.7.
Position Fix Parameters
Table 3.7.
Screen 4 Parameters (continued)
Parameter
Description
