Справочник Пользователя для RoyalTek rgm-3000

 

30 

 

In this mode the receiver will turn on every 

30 minutes to perform a system update 

consisting of a RTC calibration and 

satellite ephemeris data collection if 

required (i.e., a new satellite has become 

visible) as well as all software tasks to 

support SnapStart in the event of an NMI. 

Ephemeris collection time in general this 

takes 18 to 30 seconds. If ephemeris data 

is not required then the system will 

re-calibrate and shut down. In either case, 

the amount of time the receiver remains 

off will be in proportion to how long it 

stayed on: 

Off period = (On Period*(1-Duty Cycle) / 

Duty Cycle) 

Off Period is limited to 30 minutes. The 

duty cycle will not be less than 

approximately On Period/1800, or about 

1%. Push-to-Fix keeps the ephemeris for 

all visible satellites up to date so 

position/velocity fixes can generally be 

computed within SnapStart times (when 

requested by the user) on the order of 3 

seconds. 

 

Table C-20 contains the input values for 

the following example:   

Example: Poll receiver for current 

navigation parameters. 

A0A20002—Start Sequence and Payload 

Length 

9800—Payload 

0098B0B3—Message Checksum and End 

Sequence 

 

Table C-20 Poll Receiver for Navigation Parameters 

Message ID 

1 

 

98 

 

ASCII 152 

Reserved 1 

  00 

 

 

Payload length: 2 bytes 

 

Table B-28 contains the input values for the 

following example: 

Example: Set port 0 to NMEA with 9600 baud, 

8 data bits, 1 stop bit, no parity. Set 

port 1 to SiRF binary with 57600 baud, 8 

data bits, 1 stop bit, no parity. Do not 

configure ports 2 and 3. 

Example: 

A0A20031—Start Sequence and Payload 

Length 

A5000101000025800801000000010000000

0E1000801000000FF050500000000000 

0000000FF0505000000000000000000—Pa

yload 

0452B0B3—Message Checksum and End 

Sequence