Brandywine GPS8 Plus Bedienungsanleitung

MANUAL P/N 900000007 REV 2.0

User Guide

GPS Time and Frequency System

Model GPS8 Plus

P/N 071000003

Revision 2.0

October 2004

Brandywine Communications

2230 South Fairview Street

Santa Ana, CA 92704

(714) 755 1050

(714) 755 0175

http://www.brandywinecomm.com

MANUAL P/N 900000007 REV 2.0

Revision History

REVISION DATE COMMENTS

1.9 09-16-04 Preliminary release of GPS8 Plus user guide.

2.0 10-11-04 Revision of entire user guide.

MANUAL P/N 900000007 REV 2.0

Safety Warnings

WARNING: This unit contains lethal AC voltages.

Disconnect the unit from the AC supply before removing

the cover.

WARNING:

The lightning flash with an arrowhead inside of an equilateral triangle is

intended to alert the user to the presence of un-insulated “dangerous

voltage” within the product’s enclosure. The “dangerous voltage” may be

of sufficient magnitude to constitute as a risk of electrical shock to people.

CAUTION:

The exclamation point inside of an equilateral triangle is intended to alert

the user to the presence of important operation and maintenance

instructions in the user guide.

MANUAL P/N 900000007 REV 2.0

Table of Contents

1Introduction ............................................................................................................................. 6

1.1 Scope of Section ............................................................................................................ 6

1.2 Purpose of Equipment.................................................................................................... 6

1.3 Specification ...................................................................................................................7

1.4 Controls, Indicators, and Connectors........................................................................... 11

2Installation............................................................................................................................. 13

2.1 Scope of Section .......................................................................................................... 13

2.2 Unpacking and Inspection............................................................................................ 13

2.3 Installation and Testing ................................................................................................ 13

3Operating Instructions........................................................................................................... 14

3.1 Scope of Section .......................................................................................................... 14

3.2 Operation...................................................................................................................... 14

3.3 Serial Communications ................................................................................................ 17

3.4 TxD1/RxD1 (Rear Panel J13) Baud Rate and Character Format................................ 18

3.5 TxD1/RxD1 (Rear Panel J13) User Commands and GPS8 Plus Responses ............. 19

3.6 Message Formats......................................................................................................... 22

3.6.1 Time and Date with Status, Position Averager Status, and Output Status ......... 22

3.6.2 Sounder Control .................................................................................................. 23

3.6.3 1

Pulse Output Data and Command (J10) ........................................................ 23

3.6.4 Dilution of Precision Values and Satellites Used................................................. 26

3.6.5 Time Code and Serial Data Output Formats ....................................................... 27

3.6.6 Frequency and Phase Controller Data ................................................................ 30

3.6.7 Health Status of Satellites ................................................................................... 36

3.6.8 Leap Second Information (Firmware 13+)........................................................... 37

3.6.9 2

Pulse Output Data and Command (PCB CON6 Pin 3).................................. 38

3.6.10 Location and Signal Noise Ratio of Satellites...................................................... 39

3.6.11 Firmware Version Number................................................................................... 40

3.6.12 Offset of Local Time Data and Command........................................................... 41

3.6.13 Position of GPS Antenna..................................................................................... 42

3.6.14 Additional Information (Including Magnetic Declination) ..................................... 43

3.6.15 Request Precision Time ...................................................................................... 43

3.6.16 Software Reset Command .................................................................................. 44

3.7 TxD2/RxD2 Messages (Rear Panel J12) ..................................................................... 45

3.7.1 Type 1 Format ..................................................................................................... 45

3.7.2 Type 2 Format ..................................................................................................... 45

3.7.3 Type 3 Format (GPS4 Format)............................................................................ 47

3.8 IRIG B and AFNOR NF 2 87-500 Time Code Output .................................................. 48

3.8.1 IRIG B and AFNOR NF 2 87-500 Time Code Bit Allocation ............................... 49

3.9 NASA36 Time Code Output ......................................................................................... 51

3.10 2137 Time Code Output............................................................................................... 53

3.11 VELA Time Code Output (Slow Code)......................................................................... 54

3.12 Alarm Contacts (J14) ................................................................................................... 55

4GPS8 Plus Keypad and Display Operation .......................................................................... 56

4.1 Scope of Section .......................................................................................................... 56

4.2 General Principles of Operation of Keypad and Display.............................................. 56

4.3 Messages after Power On............................................................................................ 57

4.3.1 Operating Mode Selection ................................................................................... 58

4.3.2 GPS Locked Mode .............................................................................................. 58

4.3.3 Free Run Mode.................................................................................................... 59

4.3.4 1 PPS Lock Mode................................................................................................ 59

4.3.5 Manual Time and Date Entry............................................................................... 59

4.4 Position Screen ............................................................................................................ 60

4.5 Satellites Tracked Screen ............................................................................................ 60

4.6 1 PPS Status Screen ................................................................................................... 61

4.7 Mean Phase Screen..................................................................................................... 62

4.8 Estimated Mean Frequency ......................................................................................... 63

MANUAL P/N 900000007 REV 2.0

4.9 Frequency Control........................................................................................................ 63

4.9.1 Test Configuration of Frequency Controller ........................................................ 64

4.10 Position Mode Configuration ........................................................................................ 64

4.10.1 Position Mode Selection ...................................................................................... 65

4.11 Local Time Configuration ............................................................................................. 65

4.11.1 Local Time Offset Adjustment ............................................................................. 65

4.12 Time Code Configuration ............................................................................................. 66

4.12.1 Time Code Selection ........................................................................................... 66

4.12.2 J13 TXD1 Configuration ...................................................................................... 67

4.12.3 J12 TXD2 Configuration ...................................................................................... 67

4.13 J10 Pulse Output Configuration ................................................................................... 68

4.13.1 J10 Timed Pulse Configuration ........................................................................... 68

4.13.2 J10 Pulse Period Configuration........................................................................... 69

4.13.3 J10 Pulse Time Code Configuration.................................................................... 70

4.14 Status Screen and Alarm Configuration 1.................................................................... 71

4.14.1 Selection of Alarm Masks 1................................................................................. 71

4.15 Status Screen and Alarm Configuration 2.................................................................... 72

4.15.1 Selection of Alarm Masks 2................................................................................. 72

4.16 Status Screen 3............................................................................................................ 73

4.17 Status Screen 4............................................................................................................ 73

5Principles of Operation.......................................................................................................... 74

5.1 Scope of Section .......................................................................................................... 74

5.2 Theory of Operation ..................................................................................................... 74

6Maintenance and Calibration ................................................................................................ 77

6.1 Scope of Section .......................................................................................................... 77

6.2 Routine Maintenance ................................................................................................... 77

6.3 Fault Finding................................................................................................................. 78

6.4 Oscillator Module.......................................................................................................... 78

7Diagrams............................................................................................................................... 79

8Appendix I Output Alarm Masks ........................................................................................... 86

9Appendix II Phase Noise....................................................................................................... 90

MANUAL P/N 900000007 REV 2.0

1 Introduction

1.1 Scope of Section

Section 1 provides a general description of the GPS8 Plus. The introduction is

divided into three parts; purpose of the equipment, physical and electrical

specification, and an identification of the external controls, indicators, and

connectors.

1.2 Purpose of Equipment

The GPS8 Plus is a multi-output precision time and frequency standard that uses

the Global Positioning System (GPS) to steer and hold an internal oscillator and

clock system precisely on time. It is designed for use in telecommunications,

power utility, and military communication applications. Time and frequency

information is maintained to high accuracy by the internal oscillator even if no

satellites can be tracked. Each space vehicle in the GPS system transmits time,

frequency, and navigation information in two formats.

•P code: a precision code restricted to authorized users.

•C/A code: an unrestricted code available for general use.

In both cases the time information is maintained by the USA Department of

Defense and is traceable to the USA Naval Observatory. The standard GPS8

Plus uses the C/A code.

The GPS8 Plus provides a wide range of output options to form a complete time

and frequency management system. In addition, satellite data and navigational

information is outputted in the form of longitude, latitude, and altitude for

applications where precise positions must be known. For fixed position

operation, precise averaging of the position is carried out by the GPS8 Plus over

24 hours.

MANUAL P/N 900000007 REV 2.0

1.3 Specification

SPECIFICATION DESCRIPTION OPTION

Satellite Signal GPS L1 1.57542 GHz

Satellite Code C/A 1.023 MHz

Receiver Type Parallel eight channels (8 satellites tracked

continuously and simultaneously)

Receiver Sensitivity -133 dBm

Input Impedance 50 ohm

Standard Antenna Active omni-directional 30 dB gain

Cold Start Requirement Automatic (no time or position input needed)

Typically 8 minutes to time synchronization

Satellite Acquisition Time Typically < 20 seconds (warm start)

Data Update Rate 1 per second

Timing Accuracy Tracking

Satellites (XTAL_1)

Within ±150 ns of GPS time

Standard deviation of 34 ns

Rubidium (Rb_2) oscillator

Better than 200 ns per hour

High stability OCXO (XTAL_1) oscillator

Better than 1 µs per hour

Standard OCXO (XTAL_2) oscillator

Better than 10 µs per hour

Timing Stability Tracking

No Satellites

Temperature Compensated Crystal Oscillator (TCXO)

Better than 120 µs per hour

Rubidium (Rb_2) disciplined oscillator

1 s 10 s 100 s 1000 s 10000 s 100000 s

3E-11 1E-11 3E-12 3E-12 2E-12 8E-13

Precision OCXO (XTAL_1) disciplined oscillator

1 s 10 s 100 s 1000 s 10000 s 100000 s

2E-12 3E-12 1E-11 1E-11 3E-12 1E-12

Standard OCXO (XTAL_2) disciplined oscillator

1 s 10 s 100 s 1000 s 10000 s 100000 s

1E-9 2E-10 3E-10 3E-10 3E-11 1E-12

-Frequency Accuracy

-Tracking At Least One

Satellite

Temperature Compensated (TCXO) disciplined

oscillator

1 s 10 s 100 s 1000 s 10000 s 100000 s

1.5E-9 5E-10 4E-10 3E-10 3E-11 1E-12

Rubidium oscillator (Rb_2)

5 x 10

-11

per month

High Stability OCXO (XTAL_1)

1 x 10

-10

per day after 30 days of operation

Standard OCXO (XTAL_2)

5 x 10

-9

per day after 30 days of operation

Frequency Stability

Tracking No Satellites

Temperature compensated (TCXO) oscillator

5 x 10

-9

per day after 30 days of operation

MANUAL P/N 900000007 REV 2.0

SPECIFICATION DESCRIPTION OPTION

Static Operation Standard

Deviation Position Average

(measured in northern

hemisphere over sixteen

24 hours averaged

positions)

2.3 meters N/S 1.9 meters E/W 5.0 meters Vertical

Mobile Operation

Maximum Operational

Velocity

460 meters per second

Disciplined Oscillator

Control Resolution (Rb_2)

3 x 10

-14

SPECIFICATION DESCRIPTION OPTION

Power LED (green)

Fault LED (red)

Time Valid LED (green)

Tracking Satellites LED (green)

Monitoring/Status

Indicators

Reject Data LED (yellow)

Output Monitors 9 output monitor LEDs at each output socket for

present signal (and status available via TxD1/RxD1)

Sounder Selectable audible marker of GPS receiver 1 PPS,

Internal 1 PPS, or none

Antenna

Receiver

Initialization

Oscillator control

Oscillator frequency

Configuration parameters

Synthesizer phase-locked loop

RAM

Built In Test

FLASH/EPROM

Manual Controls Primary power switch

4 way keypad

Data Entry Option

2 line LCD display

Instrument: -10 to +50°C

Operating Temperature

Range Antenna: -40 to +75°C

Humidity 95% non-condensing

Power Supply 115/230 VAC ±10% 45 - 65 Hz

48 VDC

DC Supply Options

24 VDC

Power Consumption 10 W typically

Case 19” 1U rack mounting 12.01 inches deep

Weight 12 lbs typically

MANUAL P/N 900000007 REV 2.0

INPUTS AND OUTPUTS REF DESCRIPTION OPTION

Telecom Frequency

Options

See

Below

E1 2.048 MHz

T1 1.544 MHz

Alarm J14

5-PIN din

180 DEG

Free contacts from status monitor

changeover relay and center contact can

be linked to + 5 V or 0 V internally

TxD1/RxD1 RS232 (OR RS422 user

selectable inside)

Port 1 J13

9 way D

socket User commands select and control output

types, request time data, frequency

controller data, GPS data, and instrument

output status

TxD2/RxD2 RS232 (OR RS422 user

selectable inside)

Port 2 J12

9 way D

socket Automatic 1 per second time and status

output OR output on receipt of user time

request

Carries 5 VDC at center pin for powered

antennas

GPS Ant J11

50R BNC

4 V output at 40 mA load

Option J10

50R BNC

One digital (DCLS 0 to 5 V from 50R) time

code same as selected modulated time

code or is 1

pulsed output

User selectable 1

pulse rate in place of

the time code

Selected time code or pulse level 0 to 5 V

from 50R source

Programmable Pulse

Output

-1 pulse per 2 ms to 1 pulse per day, with

1 ms to 9999 ms pulse duration active

high or active low

-1 pulse per day, active high 100 ms is

the default value

-Pulse time accuracy (on and off) is UTC

±150 ns

Programmable Pulse

Output

PCB

ONLY

CON6

PIN 3

-1 pulse per 2 ms to 1 pulse per day, with

1 ms to 9999 ms pulse duration active

high or active low

-1 pulse per minute, active high 100 ms is

the default value

-Pulse time is 350 µs early

1 PPS J9

50R BNC

1 PPS, 0 to 5 V square wave from 50R

One user selectable modulated time code

IRIG B AFNOR NASA36 VELA 2137

Level 2.17 Vpp carrier high level from 10R

Maximum 1.7 Vpp into 50R (internally

adjustable)

Code J8

50R BNC

IRIG B is the default selection

8 KHz square wave (Telecom frame rate)8 KHz J7

75R BNC Square wave 0 to 5 V from 75R

MANUAL P/N 900000007 REV 2.0

INPUTS AND OUTPUTS REF DESCRIPTION OPTION

Outputs are link selectable (internally)

with the following options:

Telecom (2.048 MHz or 1.544 MHz as

selected above)

1 MHz (internal jumper selection)

5 MHz (internal jumper selection)

10 MHz (internal jumper selection)

Output level 0 to 5 V from 75R

Telco (two) J6 & J5

75R BNC

Output level square wave 2.37 Vpp into

75R (G703 ¶ 6)

Outputs are from Bandpass filter module

2, specified at time of purchase, with the

following options:

Telecom (2.048 MHz or 1.544 MHz as

selected above)

1 MHz

5 MHz

10 MHz

Each output level 1 Vrms from 50R, 75R,

or 120R by internal jumper selection (50R

is the default)

Sine wave 3 Vpp from 75R meets G703 ¶

Transformer isolation (75R connector

grounded to case)

Frequency accuracy and holdover similar

to tables above

Meets primary reference clock

requirements G811

Harmonic distortion -30 dBc or better

Freq 2 (two) J4 & J3

75R BNC

5 MHz or 10 MHz phase noise, see

Appendix II

Outputs are from Bandpass filter module

2, specified at time of purchase, with the

following options:

Telecom (2.048 MHz or 1.544 MHz as

selected above)

1 MHz

5 MHz

10 MHz

Output level 1 Vrms from 50R

Frequency accuracy and holdover as per

tables above

Transformer isolation (50R isolated

connectors)

Harmonic distortion -30 dBc or better

Freq 1 (two) J2 & J1

50R BNC

5 MHz or 10 MHz phase noise, see

Appendix II

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