presented to: littleton / napa gus type 1 maintainers by: faa sos ajw-191 date: june 2011 federal...

Presented to: Littleton / Napa GUS Type 1 Maintainers

By: FAA SOS AJW-191

Date: June 2011

Federal AviationAdministration

GUS Type 1 Maintainer Refresher Training

SGS Type 1 Subsystem

GUS Type 1 Maintainer Refresher Training2-2Federal Aviation

AdministrationAPC and APA - June 2011

Geostationary Communication

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GEO Uplink Subsystem Type 1 (GUS Type 1) Functionality

• Receives duplicate WAAS messages from WMS

• Confirms Messages• GUS Type 1 selects one

WMS as source and FEC encodes message

• Upconverted to C-Band and transmitted to GEO




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Six GUS Type 1 Locations

• Six GUS Type 1 Locations, two per GEO satellite

– GEO for Central Region West (CRW)

• CRW-135 (PRN) Galaxy 15 GEO Satellite

• GUST Site: Napa, California (APC)

• GUST Site: Littleton, Colorado (LTN)

– GEO for Central Region East (CRE)

• CRE-138 (PRN) Anik F1R GEO Satellite

• GUST Site: Woodbine, Maryland (WBN)

• GUST Site: Brewster, Washington (BRE-B)

– GEO for Gap Filler (AMR)

• AMR-133 (PRN) Inmarsat I-4F3 GEO Satellite

• GUST Site: Paumalu, Hawaii (HDH)

• GUST Site: Santa Paula, California (SZP)




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GUS in Operation

• Two GUS in Operation for each GEO satellite.

– One (Primary) GUS transmitting to GEO

– One (Backup) GUS transmitting to dummy load

Dummy LoadGUS

PrimaryGUS Backup

GCCS

GEO SatellitePOR




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GCCS

AMR-133Paumalu/HDH

(HDH)

AMR-133Santa Paula

(SZP)




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GCCS




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GUS Type 1 Primary

GUS Type 1 Backup

GCCS

GEO SatelliteCRW-135

GUS Primary

GUS Backup

GCCS

GEO SatelliteAMR-133

GCCS

GUS Type 1 Primary

GUS Type 1 Backup

GCCS

GEO SatelliteCRE-138




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Coverage Area

CRW135

CRE138

AMR133




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GUS Type 1 Description

A GUS Type 1 site consists of the following:• Radio Frequency Uplink (RFU) Subsystem• RFU Antenna• Signal Generator Subsystem (SGS) Type 1• L1/L2/L5 Antenna




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GUS Type 1 Block Diagram




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RFU Subsystem

• Amplifies the WAAS signal and Uplinks it to the GEO.

• Receives L1 and L5 Signals from GEO, amplifies them and passes to SGS Type 1

• Feedback the transmitted L1 and L5 signals for test purposes

The RFU subsystem performs the following:




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• Generates a GPS-like ranging signal

• Provides GUS Type 1 interface to the WMS via the Terrestrial Communications network (TCN)

• Selects one WMS as source for both the Primary and Backup GUS Type 1s

• Generates PRN Codes for the GEO satellite

The SGS Type 1 performs the following:




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• Verifies WAAS messages received from WMS by performing CRC check and validating TOA has not expired

• Combines WAAS messages received from the WMS with the PRN code and Binary Phase Shift Keying (BPSK) modulates L1 and L5 70 MHz IF carriers

• Provides a stable frequency standard to synchronize GUS Type 1 hardware

• Steers the Frequency Standard to synchronize the WAAS message with GPS time

The SGS Type 1 performs the following: (continued)





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• Provides independent control of L1 and L5 IF signal code and carrier relationships

• Provides signal quality monitoring of the WAAS Signal-in-Space (SIS)

• Detects interference and issues uplink power command to RFU

• Controls/monitors RFU antenna/dummy load switch

• Provides GUS Type 1 status display

• Performs fault monitoring on major GUS Type 1 components

The SGS Type 1 performs the following: (continued)





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SGS Type 1/RFU Interfaces

• Interfaces between SGS Type 1 and the RFU are:

– L1 and L5 IF uplink signals from SGS Type 1 to RFU

– WAAS received L1 and L5 signals from GEO Satellite sent from RFU to SGS Type 1

– L1 and L5 Test Loop Translator (TLT) loopback

– Control/Status interface between SGS Type 1 and RFU Monitor and Control (M&C) unit.

• Controls the RF switch through the M&C

• Commands from SGS Type 1 to increase or decrease transmitter power

• RFU status provided to SGS Type 1

– 5 MHz signal SGS Type 1 to RFU (up-converters)

– 10 MHz signal SGS Type 1 to RFU (TLTs)




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Access Router A1A4Access Router A2A4

GUS Receiver Type 1 A2A6

Frequency Distribution Amplifier Type 1 A2A8

GUS Processor Type 1 A2A10

Keyboard/Display Console A2A14

Frequency Standard Type 1 A2A16

Power Conditioner A2A18Power Conditioner A1A18

Signal Generator Type 1 A1A16

Safety Computer Type 1 A1A12

Pulse Distribution Amplifier A1A10

Ethernet Safety Switch A1A8

Phase Noise Enhancer A1A6

Blower Assembly A3A2Blower Assembly A3A2

SGS Type 1 Cabinet – Front View




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SGS Type 1 Cabinet – Rear View




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SAFETY COMPUTER TYPE

1 A1A12

ACCESS ROUTER

A1A4

TO/FROM

TCN

GUS PROCESSOR

TYPE 1A2A10

POWER CONDITIONER

A1A18

FREQUENCY STANDARD

TYPE 1 A2A16

SGS DOUBLE CABINET A1

UNIT 6 SGS TYPE 1

KEYBOARD/DISPLAY

CONSOLE A2A14

8-PORT ASYNC

ADAPTER A2B1

POWER CONDITIONER

A2A18

SIGNAL GENERATOR TYPE 1 A1A16

WAAS MESSAGE

PROCESSOR 2

ETHERNET SAFETY SWITCH

A1A8

PHASE NOISE

ENHANCER A1A6

FREQUENCY DISTRIBUTION

AMPLIFIER TYPE 1 A2A8

WAAS MESSAGE

PROCESSOR 1

COMPARATOR

PULSE DISTRIBUTION

AMPLIFIER A1A10

L1/L2/L5 ANTENNA A2

TRANSIENT PROTECTION ASSEMBLY A3

GUS RECEIVER TYPE 1 A2A6

RF COMBINER/

SPLITTER A2

RF COMBINER/

SPLITTER A3

AT1

RF COMBINER/

SPLITTER A1

AT2

AT3

RF COMBINER/

SPLITTER A4 AT4

AT5

SGS ATTENUATOR ASSEMBLY A2B2

RFU(outside WAAS baseline)

L1-BAND LNA ASSEMBLY COMBINER

TEST LOOP TRANSLATOR

FREQUENCY DISTRIBUTION

AMPLIFIER

C-BAND UP CONVERTER

KLYSTRON POWER

AMPLIFIER

KLYSTRON POWER

AMPLIFIER

RFU ANTENNA

L5-BAND LNA ASSEMBLY

5 MHZ

M&C COMPUTER

ACCESS ROUTER

A2A4

TEST SEC 2

OMNI SEC 1

GEO SEC 3

C-BAND U/L (L5)

C-BAND U/L (L1)

GEO L5GEO L1GPS (L

1/L2)

GEO (L1)

COUPLER

COUPLER

L5 IF (70 MHZ)

PRINCIPAL DATA FLOW

OTHER

RS-232

RS-232

L1 SIGNAL GENERATOR

L5 SIGNAL GENERATOR

L1 TLT SWITCH

SPLITTER

C-BAND UP CONVERTER

ANTENNA/DUMMY LOAD SWITCH

TEST LOOP TRANSLATOR

L1 RF @ L2 FREQ

10 MHZ

GEO L5

GEO L1

TLT L1

L5 TLT SWITCH

TLT L5

C-Band (L1)

C-Band (L1)

C-Band (L1)

C-Band (L5)

C-Band (L1/L5)

C-Band (L5)

C-Band (L5)

10 MHZ

C-Band (L5)

C-Band (L1)

5 MHZ

5 MHZ

L5 IF (70 MHz)

L1 IF (70 MHz)

C-Band (L1)

C-Band (L5)

5 MHZ

L1 RF @ L2 FREQ

L5 RF

1 PPS

10 MHZ

ALARM STATUS

1 PPSALARM STATUSALARM STATUSRS232 CONTROL/STATUS

10 MHZ TTL 5 MHZ 10 MHZ

10 MHZ

1 PPS

10 MHZ

RS232 CONTROL/

STATUS

ALARM STATUSALARM STATUS

GEO L1 or TLT L1

GEO L5 or TLT L5

RS422 STATUS AND CONTROL

L1 TLT KPA LOOPBACK

L5 TLT KPA LOOPBACKL5

L1/L2

L5

L1/L2L5L1

RF COUPLER

ASSY A1B2

RS232 CONTROL/STATUS

L1 RF @L2 FREQ

L5 RFL5 MESSAGE

L1 MESSAGE

RS232 CONTROL/STATUS TEST TAPS

OPTICAL ISOLATOR ASSY A1B1 RS232

CONTROL/STATUS

RS232 CONTROL/

STATUS

L5 RF, L1 RF @ L2 FREQ TEST TAPS

6A1A1

AND

6A1A2

I/O

PANELS

GUS Type 1 Block Diagram




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1. Function of the Access Router is: Two independent Access Routers for connectivity to the WAN (TCS) Access Router A1A4 provides network 1 connectivity for:

GUS Processor Type1 Power Conditioner A2A18

Access Router A2A4 provides network 2 connectivity for: GUS Processor Type 1 Power Conditioner A1A18

2. Release 2 changes: Will connect to Core/Distribution Routers via T1 Multilink connection instead of single V.35. Removes the FTI provider A/B path switching and gives the WAAS (hardware) the responsibility of

selecting the healthiest path using new hardware (VWIC modules) added to routers T1 VWIC modules will be added to each Access Router for T1 connectivity Requires changes to network cabling and the I/O panel to accommodate cabling.

Access Router




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VWIC Module

Access Router Rear

NOTE: Change to GUST Access Routers (Release 2). Serial module replaced byT1 Module (VWIC)

Multi-Link




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1. Functions of the GUS Processor Type 1 are: GUS Processor software interfaces with the C&V, GUS Receiver, WMPs and

M&C (in RFU) Receives GUS Receiver Type 1 data (received via 8-port async adapter) Receives WAAS messages once per second from the selected C&V Receives GUS mode switch requests from the C&V Receives faults/status from M&C in the RFU subsystem Sends the following data to the WAAS Message Processors 1 and 2 in Safety

Computer Type 1 via Ethernet Safety Switch: GUS Receiver Type 1 data, primarily for signal quality and interference

checks WAAS messages received from the C&V (acts like a buffer, no processing)

Sends status and fault data, on the SGS Type 1 and RFU subsystem, to the C&V

Sends commands to M&C in RFU for switchover Displays maintainer data on Keyboard/Display Console

GUS Processor Type 1




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Second Power Cable

GUS Processor Type 1 Rear

NOTE: New processor required a change to Power Conditioner configuration with the addition of a second power cable (Release 1)




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1. Release 1 deficiences: If operator performs the Shutdown procedure, requires the maintainer to push

the power on button to restart processor. Will be corrected in Release 2. The attention indicator does not extinguish. Will be corrected in Release 2.

GUS Processor Type 1




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The Keyboard/Display Console provides a user interface with the GUS Processor Type 1. The unit is capable of handling up to eight devices.

If is physically connected to the GUS Processor Type 1 and Power Conditioner A2A18.

Keyboard/Display Console




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1. Purpose of GUS Receiver Type 1 is to process GPS and WAAS GEO satellite signals. It contains three independent sections, which are:

ONMI – gets initial time from GPS satellites (L1/L2 signals), also an independent GEO monitor. In addition, gets L5 signal from Signal Generator Type 1.

TEST – monitors local loopback signals (the L1 and L5 transmitted signals via the Test Loop Translator (TLT) and the L2 signal (up-converted L1 signal) received from Signal Generator Type 1)

GEO – receives the GEO signals L1 and L5 received from GEO satellite (via antenna mounted on RFU antenna) to monitor the broadcast messages.

2. GUS Receiver Type 1 receives a 10 MHz reference signal from the Phase Noise Enhancer via the Frequency Distribution Amplifier Type 1.

3. GUS Receiver Type 1 outputs a 1 PPS reference signal for use by the Safety Computer Type 1 and Signal Generator Type 1 (signal via Pulse Distribution Amplifier)

4. Time and 3 Data ports are connected to the GUS Processor Type 1 for: GPS Timing information (Time port) WAAS GEO message Satellite ranging measurements

GUS Receiver Type 1




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1. Functions of the Safety Computer Type 1 are: Processing done by two independent WAAS Message Processors Each processor validates the received WAAS message for Time of Applicability

and correct CRC Performs bit-by-bit comparison of the two messages from the WMPs. Message from comparison is sent to the Signal Generator Type1 for Binary

Phase Shift Keying (BPSK) modulation Host control loop software which allows the GEO to be used as another ranging

source (ranging will not be used in release 5.1) Monitors GUS Type 1 subsystem fault alarms Receives status of the Antenna/Load switch in the RFU Receives command from WMPs to notify RFU M&C to switch antenna/load switch

position during a mode change. Controls output of the Signal Generator Type 1 (can inhibit 70 MHz output)

Safety Computer Type 1




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The Ethernet Safety Switch provides network connectivity between the GUS Processor Type 1 and the WAAS Message Processors 1 and 2 (WMP 1 and WMP 2) in Safety Computer Type 1

Ethernet Safety Switch




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1. Functions of the Signal Generator Type 1 are: Comprised of two independent L1 and L5 signal generators Signal generation (L1 and L5) with precise control of frequencies and phases Produces two independent 70 MHz IF signals for L1 and L5 Receives a 10 MHz reference signal from Phase Noise Enhancer via the

Frequency Distribution Amplifier Type 1, for use by both signal generators Receives a 1 PPS signal from the GUS Receiver Type 1 via Pulse Distribution

Amplifier Independent command and status interfaces with the WMPs in the Safety

Computer Type1 Independent message interfaces with the Comparator in the Safety Computer

Type 1 (for WAAS SIS message) 50 ohm inline terminator added to 1 PPS interface in Release 1 (see next slide)

Signal Generator Type 1




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50 ohm terminatorJ1 1 PPS IN

Signal Generator Type 1Rear View




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1. Function of the Pulse Distribution Amplifier is: Provide amplification and distribution of the 1 PPS reference signal Input is 1 PPS reference signal from GUS Receiver Type 1 Outputs are to the following LRUs:

Safety Computer Type 1 Signal Generator Type 1

Pulse Distribution Amplifier




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1. Function of the Frequency Distribution Amplifier Type 1 is: Provide amplification and distribution of the 10 MHz reference signal Input is 10 MHz reference signal from the Phase Noise Enhancer Outputs are to the following LRUs:

GUS Receiver Type 1 Frequency Distribution Amplifier in the RFU (used by Up Converters in TLT) Signal Generator Type 1

Frequency Distribution Amplifier Type 1




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1. Function of the Phase Noise Enhancer is: Provide phaselock and noise reduction for the reference signal received from the

Frequency Standard Type 1 Input is 5 MHz reference signal from Frequency Standard Type 1 Outputs are to the following LRUs:

10 MHz to Frequency Distribution Amplifier Type 1 5 MHz to the RFU Subsystem (used by the C-Band Up Converters – L1 and L5)

Phase Noise Enhancer




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1. Function of the Frequency Standard Type 1 is: Provide an extremely accurate and stable 5 MHz and 10 MHz reference signal Outputs are to the following LRUs:

10 MHz reference signal to Safety Computer Type 1 5 MHz to reference signal to Phase Noise Enhancer

Frequency Standard Type 1




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1. Function of the Power Conditioner is: (Two independent Power Conditioners, one in each cabinet bay)

Provides isolated, regulated, and controllable 120 VAC and 24 VDC (A2A18 only) Power Conditioner A1A18 provides power for:

Access Router A1A4 Phase Noise Enhancer A1A6 Ethernet Safety Switch A1A8 Pulse Distribution Amplifier A1A10 Safety Computer Type 1 A1A12 Signal Generator Type 1 A1A16

Power Conditioner A2A18 provides power for: Access Router A2A4 GUS Receiver Type 1 A2A6 (24 VDC) Frequency Distribution Amplifier A2A8 GUS Processor Type 1 A2A10 Keyboard/Display Console A2A14 Frequency Standard Type 1 A2A16 L1/L2/L5 Antenna (24 VDC)

Power Conditioner




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The 8-Port Asynchronous Adapter is part of the GUS Processor Type 1. It consists of two components, the interface and asynchronous card (contained in slot in the GUS Processor Type 1. It connects the following components to the GUS Processor Type 1:• GUS Receiver Type 1 (three (3) data ports and one (1) time port)• Antenna/Load Switch in the RFU Subsystem

8-Port Asynchronous Adapter




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SGS Attenuator Assembly contains four (4) RF Combiner/Splitters and 5 Variable Attenuators (4 are 90 dB and one is 50 DB). The attenuators provide attenuation of the L1/L2 and L5 received signals. The RF Combiner/Splitters are used to 1) combine the L1 transmitted signal with L2 (up converted L1) signal from the Signal Generator 2) provide isolation for the L1/L2 Omni, L1 and L5 GEO, and the L5 transmitted signals.

RF Combiner/Splitter

Variable Attenuator

50 dB

90 dB

30 dB Isolation and low insertion loss 0.3 dB

Isolation

IsolationCombining

SGS Attenuator Assembly

SGS Attenuator Assembly A2B2

Interfaces




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The Optical Isolator Assembly provides RS-232 data test points between the WAAS Message Processor and Signal Generator to be monitored by an external piece of test equipment. These test points support the ability to troubleshoot and diagnose anomalies in order to affect corrective maintenance as well as provide a more robust test environment for evaluating GUST receiver firmware improvements.

Optical Coupler Assembly

Optical Coupler




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The RF Coupler Assembly provides RF data test points from the WAAS Signal Generator to be monitored by an external piece of test equipment. These test points support the ability to troubleshoot and diagnose anomalies in order to affect corrective maintenance as well as provide a more robust test environment for evaluating GUST receiver firmware improvements..

RF Isolator Assembly

RF Isolator




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The L1/L2/L5 Antenna receives signals from the GPS satellites. It amplifies and filters the received signals. The antenna assembly also includes a RF and DC transient suppressor for protection from lightning voltage.

The Transient Protection Assembly is located between the L1/L2/L5 Antenna and the SGS Type 1 Cabinet. It contains an additional RF and DC transient suppressor.

L1/L2/L5 Antenna

Transient Protection Assembly

CR2 DC Transient Protection

CR1 RF Transient Protection

RF Transient Suppressor

DC Transient Suppressor

L1/L2/L5 Antenna / Transient Protection Assembly




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L1/L2/L5 Antenna Path RF and DC Connections

• RF and DC connection locations– Cabinet I/O panel bottom– Transient Protection box located close to where cables enter

the building– GPS Omni Antenna

• RF connections are made with standard Type –N connectors

• DC connections are made with a twinax connector that looks from the outside like a BNC connector– Make sure that power is turned off before mating connectors– Visually align connector halves before mating (i.e. the raised

portion mates with lower portion of the other half)




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L1/L2/L5 Antenna DC Connectors

+24 VDC (Socket)24 VDC Return (Pin)Cabinet I/O panel (top) at A2AA BJ1

Power is controlled from PCU 2 (A2A18) circuit breaker DC3




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L1/L2/L5 Antenna Connectivity

TypicalInstallation

Wall MountedRF and DC Suppressors

RF and DCSuppressorsin antenna base

RF and DC Suppressors mounted in I/O panel in cabinet base




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SGS Type 1 Equipment Overview Summary

– The components that comprise the SGS Type 1 subsystem and their location in the SGS Type 1 cabinet

– The function of each component of the SGS Type 1 subsystem

This lesson covered the following areas:

presented to: littleton / napa gus type 1 maintainers by: faa sos ajw-191 date: june 2011 federal...

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