Novatel OM-20000041 用户手册

C 

Commands Summary

100

 MiLLennium GPSCard Software Version 4.50 Command Descriptions Manual Rev 1

This command allows the user to specify the frequency of the output pulse train available at the variable frequency
(VARF) pin of the I/O strobe connector. This command has no effect on the operation of the GPSCard; it is only
provided for user-determined applications.

The frequency (in Hertz) is calculated according to formulas which require two input parameters (k and p), such
that:

if k =1 or p =1:

VARF = 0

if k 

≠

 1, p 

≠

 1:

 VARF = 

Where:

Fs is the TCXO frequency = 20.000 MHz

k is an integer from 2 to 65536

p is an integer from 2 to 1024

The possible range of output frequencies is 0 - 5 MHz. 

The resultant waveform is composed of active-high pulses with a repetition rate as defined above, and a jitter of 50
ns unless k equals 19 999, see the table below for Syntax 1. 

The pulse width (seconds) = 

The command has two syntactical forms. One is to define a frequency, and the other is to disable this function.

frequency_out 4,8

FREQUENCY_OUT

K

P

FREQUENCY_OUT

-

-

Command

K

1 - 65 536

19 999

Variable integer

P

1 - 1 024

2 - 1 024

Variable integer

FREQUENCY_OUT

keyword

FREQUENCY_OUT

-

Command

keyword

disable

The keyword “DISABLE” is the only one defined at this time.

19 999

,

×

20 000

,

×

×

------------------------------------

1

19999

×

(

)

20000

×

(

)

⁄

[

]

⁄