GPS Module - Revision history

NickPGSmith: /* Pulse Per Second (PPS) */

2024-12-03T21:53:59Z

Pulse Per Second (PPS)

← Older revision		Revision as of 21:53, 3 December 2024
Line 161:		Line 161:
	KPPS 1733262666.999988850 assert 308694		KPPS 1733262666.999988850 assert 308694

			ppscheck /dev/ttyS0
	# ppscheck /dev/ttyS0

	Can set at boot with udev rule (/etc/udev/rules.d/gps.rules):		Can set at boot with udev rule (/etc/udev/rules.d/gps.rules):

2024-12-03T21:52:46Z

Pulse Per Second (PPS)

@@ Line 143: / Line 143: @@
 Check PPS signal:
-  ppstest /dev/pps0
+  # ppstest /dev/pps0
-  ppscheck /dev/ttyS0
+  trying PPS source "/dev/pps0"
 Can set at boot with udev rule (/etc/udev/rules.d/gps.rules):

2024-10-24T20:05:54Z

U-Center

← Older revision		Revision as of 20:05, 24 October 2024
Line 73:		Line 73:
	** Falling Edge on TOS		** Falling Edge on TOS
	** Cable Delay : 50 ns -> 20 ns (This compensates for cable delay between antenna and receiver)		** Cable Delay : 50 ns -> 20 ns (This compensates for cable delay between antenna and receiver)
			*** At 0.7c, 1 m <=> 4.8 ns

	View -> Message View:		View -> Message View:

2024-10-23T11:08:27Z

U-Center

← Older revision		Revision as of 11:08, 23 October 2024
Line 67:		Line 67:
	** PPS Settings for no GPS lock (eg use as an "alert" signal):		** PPS Settings for no GPS lock (eg use as an "alert" signal):
	*** Frequency : 1 Hz		*** Frequency : 1 Hz
	*** Duty Cycle : ~~100~~% (for permanent ~~high~~ output)		*** Duty Cycle : 0% (for permanent low output)
	** PPS Settings for GPS Locked:		** PPS Settings for GPS Locked:
	*** Frequency Locked : 1 Hz		*** Frequency Locked : 1 Hz
	*** Duty Locked : 50%		*** Duty Locked : 50%
	** Falling Edge on TOS		** Falling Edge on TOS
	** Cable Delay : 50 ns -> 10 ns (This compensates for cable delay between antenna and receiver)		** Cable Delay : 50 ns -> 20 ns (This compensates for cable delay between antenna and receiver)

	View -> Message View:		View -> Message View:

2024-10-12T06:46:41Z

U-Center

← Older revision		Revision as of 06:46, 12 October 2024
Line 65:		Line 65:
	** Baud Rate : 9600 -> 115200		** Baud Rate : 9600 -> 115200
	* TP5 (Timepulse 5)		* TP5 (Timepulse 5)
	** PPS Settings for no GPS lock (eg use as an "alert" signal:		** PPS Settings for no GPS lock (eg use as an "alert" signal):
	*** Frequency : 1 ~~Hz -> 10~~ Hz		*** Frequency : 1 Hz
	*** Duty Cycle : 100~~% -> 25~~% (~~alternatively set to 0%~~ for permanent ~~low~~ output)		*** Duty Cycle : 100% (for permanent high output)
	** PPS Settings for GPS Locked:		** PPS Settings for GPS Locked:
	*** Frequency Locked : 1 Hz		*** Frequency Locked : 1 Hz
	*** Duty Locked : 50%		*** Duty Locked : 50%
	** ~~Rising~~ Edge on TOS		** Falling Edge on TOS
	** Cable Delay : 50 ns -> 10 ns (This compensates for cable delay between antenna and receiver)		** Cable Delay : 50 ns -> 10 ns (This compensates for cable delay between antenna and receiver)

2024-10-10T09:01:47Z

HW-595 Board

← Older revision		Revision as of 09:01, 10 October 2024
Line 46:		Line 46:
	* Can be configured as a frequency reference: 0.25 Hz - 10 MHz		* Can be configured as a frequency reference: 0.25 Hz - 10 MHz
	** Output has high frequency accuracy		** Output has high frequency accuracy
	** Suffers from jitter except at a few specific frequencies		** Suffers from jitter except at a few specific frequencies that divide into internal 48 MHz clock
	* Configure in u-Center [[Media:u-Center Configuration.png\|here]]		* Configure in u-Center [[Media:u-Center Configuration.png\|here]]
	* Different frquencies/duty cycles can be configure for GPS synced/not synced		* Different frquencies/duty cycles can be configure for GPS synced/not synced

2024-10-04T19:58:06Z

GPSD

@@ Line 87: / Line 87: @@
 Can be tested with something like (Debug level 4) :
   gpsd -N -n -s 9600 -D 4 /dev/ttyS0 /dev/pps0
 Configuration in /etc/sysconfig/gpsd, which by default enables detection of USB devices via udev events including creation of a PPS device (/dev/pps0):
@@ Line 107: / Line 122: @@
   systemctl enable gpsd
   systemctl start gpsd
 Monitor with:

2024-10-04T06:20:39Z

GPSD

2024-06-05T19:47:56Z

Software

← Older revision		Revision as of 19:47, 5 June 2024
Line 58:		Line 58:
	* Communicates with uBlox with binary UBX Protocol		* Communicates with uBlox with binary UBX Protocol

	~~To view/change settings:~~ View -> Configuration View; to activate change: Send		View -> Configuration View; to activate change: Send
	* CFG (Configuration)		* CFG (Configuration)
	** Select: Save current configuration		** Select: Save current configuration
Line 74:		Line 74:
	** Cable Delay : 50 ns -> 10 ns (This compensates for cable delay between antenna and receiver)		** Cable Delay : 50 ns -> 10 ns (This compensates for cable delay between antenna and receiver)

			View -> Message View:
	(View -> Message View):
	* Firmware version: UBX -> MON (Monitor) -> VER (Version)		* Firmware version: UBX -> MON (Monitor) -> VER (Version)
			** Currently: 7.03 (45969)

	=== GPSD ===		=== GPSD ===

2024-06-05T19:40:20Z

U-Center

← Older revision		Revision as of 19:40, 5 June 2024
Line 59:		Line 59:

	To view/change settings: View -> Configuration View; to activate change: Send		To view/change settings: View -> Configuration View; to activate change: Send
			* CFG (Configuration)
			** Select: Save current configuration
			** Select in Devices: 2-I2C-EEPROM
	* PRT (Ports)		* PRT (Ports)
	** Baud Rate : 9600 -> 115200		** Baud Rate : 9600 -> 115200
Line 70:		Line 73:
	** Rising Edge on TOS		** Rising Edge on TOS
	** Cable Delay : 50 ns -> 10 ns (This compensates for cable delay between antenna and receiver)		** Cable Delay : 50 ns -> 10 ns (This compensates for cable delay between antenna and receiver)
	** UBX -> CFG (Config) -> CFG (Configuration) [Save accross reboots]
	** Select 2-I2C-EEPROM in the Devices option

	~~Save accross reboots~~ (~~view~~ -> Message View):
			(View -> Message View):
	* Firmware version: UBX -> MON (Monitor) -> VER (Version)		* Firmware version: UBX -> MON (Monitor) -> VER (Version)