geos-5 rtk uhf evk - r&d geostar navigationgeostar-navi.com/files/docs/geos5/geos-5 rtk uhf evk...

GeoS-5 RTK® UHF EVK

High precision GNSS equipment

User Manual

Rev. 1.0

R&D “GeoStar navigation” Ltd.

Moscow, 2018

GeoS-5 RTK UHF EVK. User Manual

Rev. 1.0 11.07.2018 of 21

Table of Contents 1 Abbreviations .............................................................................................................. 5

2 Functional Description ................................................................................................. 6

2.1 Introduction ............................................................................................................................... 6

2.2 Kit Contents ............................................................................................................................... 6

2.3 GeoS-5 RTK® UHF EVB ................................................................................................................ 6

2.3.1 Block Diagram .................................................................................................................... 6

2.3.2 Power ................................................................................................................................. 7

2.3.3 Organization of the Serial Ports.......................................................................................... 7

2.3.4 Serial Port Default Settings................................................................................................. 8

2.3.5 Connectors ......................................................................................................................... 8

2.3.6 Switches, Push Buttons ...................................................................................................... 8

2.3.7 LED Indicators .................................................................................................................... 8

2.3.8 AUX Connector ................................................................................................................... 9

2.3.9 UHF Radio Parameters ..................................................................................................... 10

2.3.10 Default Configuration ....................................................................................................... 10

2.4 EVB General View .................................................................................................................... 11

2.5 EVB PCB ................................................................................................................................... 11

3 Using EVK .................................................................................................................. 12

3.1 Demo Software Installation ...................................................................................................... 12

3.2 VCP Driver Installation ............................................................................................................. 12

3.3 Getting Started ......................................................................................................................... 12

3.4 GeoSDemo5® Brief Operation Guidelines ................................................................................ 13

3.4.1 Configuring Base Station .................................................................................................. 14

3.4.2 Checking Reception of RTCM Corrections ........................................................................ 15

3.4.3 FW Update ....................................................................................................................... 16

3.5 Direct Hardware Access to GeoS-5 RTK® .................................................................................. 17

3.6 Recommended GNSS Antenna Placement ............................................................................... 18

4 EVB Schematic Diagram and BOM .............................................................................. 19

5 EVB Assembly Drawing .............................................................................................. 21

List of Figures Figure. 1. GeoS-5 RTK® UHF EVB block diagram ........................................................................................ 7

Figure 2. STATUS timing diagrams .............................................................................................................. 9

Figure 3. Front panel ................................................................................................................................ 11

Figure 4. Rear panel ................................................................................................................................. 11

Figure 5. Marking of Base station (left) and Rover (right) ........................................................................ 11

Figure 6. EVB PCB view ............................................................................................................................ 11

Figure 7. Computer device manager window after connecting EVB ........................................................ 12

Figure. 8. Options to set computer COM ports ........................................................................................ 13

Figure 9. GeoSDemo5® main window ...................................................................................................... 13

Figure 10. Selecting receiver operation mode ......................................................................................... 14


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Figure 11. Coordinates hold mode settings ............................................................................................. 14

Figure 12. Indication of coordinates hold mode ...................................................................................... 14

Figure 13. Survey-in mode settings .......................................................................................................... 15

Figure 14. Survey-in mode interval count down ...................................................................................... 15

Figure 15. Request RTCM messages reception statistics .......................................................................... 15

Figure 16. RTCM messages reception statistics window .......................................................................... 16

Figure 17. Selecting FW update ............................................................................................................... 16

Figure 18. Browsing the FW file to download .......................................................................................... 17

Figure 19. FW update progress ................................................................................................................ 17

Figure 20. Firmware update complete ..................................................................................................... 17

Figure 21. Example of GNSS antenna placement ..................................................................................... 18

Figure 22. EVB schematic diagram ........................................................................................................... 19

Figure 23. EVB assembly drawing ............................................................................................................ 21


Rev. 1.0 11.07.2018 of 21

Revision History # Updates Notes

Rev. 1.0 11/07/2018

1 Initial release


Rev. 1.0 11.07.2018 of 21

1 Abbreviations DC: Direct Current

ECEF: Earth Centered Earth Fixed

EVB: Evaluation Block

EVK: Evaluation Kit

FW: Firmware

GNSS: Global Navigation Satellite System

I/O: Input/Output

LBT: Listen Before Talk

LED: Light Emission Diode

OS: Operating System

PC: Personal Computer

RF: Radio Frequency

RTCM: Radio Technical Commission for Maritime Services

RTK: Real Time Kinematic

SW: Software

VCP: Virtual COM Port

UART: Universal Asynchronous Receiver Transmitter

UHF: Ultra-High Frequency

USB: Universal Serial Bus

WGS-84: World Geodetic System 1984

1PPS: One Pulse Per Second


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2 Functional Description

2.1 Introduction

GeoS-5® RTK UHF Evaluation Kit (EVK) is designed to evaluate performance and functional capabilities of L1 GLONASS/GPS module GeoS-5® RTK. Integrated short-range UHF 433 MHz radio allows user to arrange wireless RTK system with baseline up to one kilometer.

2.2 Kit Contents

Evaluation Kit includes the following components:

1. GeoS-5® RTK UHF Evaluation Block;

2. GeoSDemo5® Demo SW; can be downloaded at http://geostar-navi.com;

3. GPS/GLONASS active antenna, 5-meter RF cable;

4. UHF 433 MHz antenna;

5. USB type A to USB-mini cable, 1 meter.

2.3 GeoS-5 RTK® UHF EVB

2.3.1 Block Diagram

The module comprises following major elements (Figure 1):

GeoS-5 RTK® GNSS module;

433 MHz UHF radio;

DC-DC converter: 5.0V3.3V;

Dual USB-UART converter;

Two multiplexers for direct access to the radio in test and production mode;

Buffer elements;

Backup battery;

Power switch;

Reset button;

GNSS antenna RF connector;

UHF antenna RF connector;

Mini-USB connector;

Auxiliary IO connector;

LED indicators.

http://geostar-navi.com/


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Dual USB—UART

converter

TX0_U

Mini-USB

DC-DC

5.0V

3.3V_13.3V_2

USB

POWER

GeoS-5 RTKSTATUS

TX1

RESET

GNSS ANT

3.0V

TX0

TX1

1PPS

VB

AT

VD

D

V_

AN

T

NRESET

ANTTX0

STATUS

UHF

TX1

RX1

TX1_U

RX0_U &

&

RX0

RX1

RX0_B

RX1_B

RX0

RX1

TX0

RX0_B

TX1

RX1_B

3.3V_2

1PPS

STATUS

ON_OFF

RX0ON_OFF ON_OFF

STATUS

UHF ANT

3.3V_2

TX0

TX1

RF_TXD

Name

1PPS

STATUS

TX0

RX0

TX1

RX1

VCC

RF_RST

RF_SW

RF_RXD

18

8

9

10

11

12

13

14

15

16

17

Pin

7 ON_OFF

V_IN

RF_STATUS

6, 20 GND

RF_RST

RF_SW

RF_RXD

RF_TXD

V_IN19V_IN

LE50-433

RXD

IO2

VD

D

ANT

IO1

3.3V_2

RF_STATUS

TXDRESET

IO9

RF_RST

RX1_LED1PPS

C1

C2

IN1

IN2

NC1

NC2

NO1

NO2

NC1

NC2

NO1

NO2

C1

C2

IN1

IN2

RF_SW

RF_TXD

RF_RXD

RX1

TX1

RX1_LED

RX1_LED

RX1_U

Figure. 1. GeoS-5 RTK® UHF EVB block diagram

2.3.2 Power

EVB is USB bus powered device. EVB takes 5.0V USB bus voltage and produces 3.3V secondary voltage by using DC-DC converters.

As EVB peak current consumption can exceed 100 mA (typical USB input current), EVB’s USB converter is programmed as high-power device i.e. requires USB port to source 500 mA current. If the port is unable to provide this requirement, it’s recommended to use USB-hub with external power capability

5.0V primary voltage comes to 5.0V3.3V DC-DC converter which output voltage directly goes to USB—UART converter and power switch. Power switch controls power of GNSS module, UHF radio and other EVB components.

Active antenna bias voltage is provided by GeoS-5 RTK® at antenna connector central pin. Antenna current is limited to 50 mA.

Built-in coin battery (CR2032) provides backup supply voltage.

2.3.3 Organization of the Serial Ports

Communication with GeoS-5 RTK® module can be accomplished in two ways:

By using USB port. Dual USB—UART converter FT2232 (FTDI) is utilized as a bridge between USB bus and serial ports of GNSS module;

By using Tx0/Rx0, Tx1/Rx1 signals of GeoS-5 RTK® available in 20-pin AUX connector.


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Simultaneous use of USB and serial ports signals is not acceptable

2.3.4 Serial Port Default Settings

On default, serial ports of GNSS module are active and set to the following configuration:

Baud rate, bit/s: Port #0 – 115200, Port #1 – 9600;

Stop bits: 1;

Parity: none.

The Port #0 operates in binary protocol, the Port #1 – in NMEA and RTCM protocols.

Setting Port #1 baud rate other than 9600 bit/s could fail communication between GNSS module and UHF radio which could lead to data loss in wireless channel

2.3.5 Connectors

Назначение разъемов:

GNSS: GNSS antenna port. Type: SMA female. GNSS module provides antenna bias voltage at the central pin of this connector.

UHF: UHF 433 MHz antenna port. Type: SMA female.

USB: USB 2.0. Type: mini-USB.

AUX: auxiliary I/O connector for direct access to the signals of GeoS-5 RTK® and UHF radio. Type: 20-pin, two-row, 2.0mm pitch connector.

2.3.6 Switches, Push Buttons

POWER: power control switch. EVB is on if the switch is turned ON. EVB is off if the switch is turned OFF;

RESET: reset pushbutton. GeoS-5 RTK® module turns to reset state if the button is pressed.

2.3.7 LED Indicators

The front panel has four LED indicators:

Tx1, Rx1: Port #1 transmit and receive data.

a. Base station: Tx1 is blinking if GeoS-5 RTK® outputs differential corrections, Rx1 not active;

b. Rover: Tx1 is blinking if GeoS-5 RTK® outputs NMEA messages, Rx1 is blinking during reception of differential corrections data;

UHF: UHF radio status indicator. Indicator behavior:

a. Continuously lighting up if the radio could not detect carrier (Rover);

b. Blinking during data transmission (Base station) or during data reception (Rover).


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STATUS: represents behavior of the STATUS signal of GeoS-5 RTK® module. Indicates status of the GNSS module – SEARCH, NAV_SINGLE, NAV_FIXED, FAILURE (refer to Figure 2 for timing diagrams):

a. SEARCH: hardware is OK (no failures found), module is searching for satellites, no fix;

b. NAV_SINGLE: satellites have been acquired and being tracked, valid position fix is available, solution type – standard accuracy (Base station/Rover) or RTK float (Rover);

c. NAV_FIXED: satellites have been acquired and being tracked, valid position fix is available, solution type – RTK fixed (Rover only);

d. FAILURE: hardware failure found, no fix.

SEARCH

2s

1s

NAV_SINGLE

0.2s

FAILURE

0.2s 0.3s

0.1s

0.2s

NAV_FIXED

Figure 2. STATUS timing diagrams

2.3.8 AUX Connector

AUX connector allows user to get direct access to the signals of GeoS-5 RTK® and UHF radio. Table 1 presents connector pin list.

Mated part: female IDC-20F.

Table 1. AUX connector pin list

Pin # Type Name Function

1-5 Not used

6 GND Ground

7 Input ON_OFF Remote control input

8 Output 1PPS 1PPS output

9 Output STATUS Module status indicator

10 Output TX0 Transmit Receive data, Port #0

11 Input RX0 Receive data, Port #0

12 Output TX1 Transmit data, Port #1

13 Input RX1 Receive data, Port #1

14 VCC 3.3V supply voltage

15 Input RF_RST UHF radio reset input, active low

16 Input RF_SW UHF radio test mode control input

17 Input RF_RXD Receive data, UHF radio

18 Output RF_TXD Transmit data, UHF radio


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Pin # Type Name Function

19 V_IN External DC power, 4.7…26 V

20 GND Ground

1. 1PPS output is not intended for 50Ω load;

2. Logic levels of input/output signals are referred to VCC.

2.3.9 UHF Radio Parameters

Table 2. 433 MHz radio parameters

Parameter Value

Baud rate 9600 bit/s

Radio channel 8

Carrier frequency 433.25 MHz

Output power +10 dBm

Preamble length 32 bytes

Whitening 170

LBT sensitivity -70 dBm

2.3.10 Default Configuration

On default, EVB’s UHF radio is configured in following way:

Base station: the radio is configured to transmit data; EVB is marked as (B), refer to Figure 5;

Rover: the radio is configured to receive data; EVB is marked as (R), refer to Figure 5.

For correct operation of RTK system comprising two EVBs, it is necessary to configure the EVB marked as (B) to work as Base station (refer to section 3.4). Default EVB configuration is Rover


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2.4 EVB General View

Figure 3. Front panel

Figure 4. Rear panel

Figure 5. Marking of Base station (left) and Rover (right)

2.5 EVB PCB

Figure 6. EVB PCB view


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3 Using EVK

3.1 Demo Software Installation

PC based demo software GeoSDemo5® is user-friendly Windows™ application that can be downloaded at http://geostar-navi.com/. The software provides an easy way to evaluate GeoS-5 RTK® functionality and performance. The software supports communication on both data protocols – binary and NMEA.

To install the GeoSDemo5®, unzip the program archive and run setup_geosdemo_v5.x.exe.

3.2 VCP Driver Installation

For establishing correct communication between demo software and EVB, the FTDI VCP driver should

be installed. If GeoSDemo5® will be used, then no extra actions are necessary as VCP driver will be installed automatically during program installation.

To enable EVB operation with any software rather than GeoSDemo5®, the VCP driver should be installed

first; it can be downloaded at http://www.ftdichip.com/Drivers/VCP.htm. The VCP driver creates two virtual COM ports when EVB is connected to the PC.

3.3 Getting Started

Attach GNSS antenna to EVB. Turn the computer on and wait until OS is loaded. Connect USB ports of EVB and computer; after that, two USB serial ports should appear in device manager (COM5, COM6 in Figure 7).

Figure 7. Computer device manager window after connecting EVB

If the operating system fails to detect USB device correctly (unknown USB device found or only one virtual COM port appeared instead of two), it is recommended to:

Connect EVB to other USB port;

Use USB-hub with external power capability.

To switch the EVB on, turn the POWER switch to ON position.

After power-up, GeoS-5 RTK® module starts automatically. On default, it operates as Rover.

http://geostar-navi.com/

http://www.ftdichip.com/Drivers/VCP.htm


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3.4 GeoSDemo5® Brief Operation Guidelines

Run GeoSDemo5®. The first screen to appear (Figure 8) provides the options to select the way of defining PC’s COM ports for communication with the receiver. If EVB is connected for the first time, it is recommended to choose the option Detection COM ports automatically that allows PC to detect COM ports associated with EVB automatically.

Figure. 8. Options to set computer COM ports

The next screen to appear is the Main program window (Figure 9) with opened bookmark Channels. The window presents information about received signals, position/velocity/time and some auxiliary data.

GPS satellites are shown blue, GLONASS satellites – light green.

Figure 9. GeoSDemo5® main window

Solution type indicator shows No Fix if navigation data is not available or not valid. As soon as the module gets valid position fix, the indicator will show following:

Single: standard accuracy solution;

Code-diff: code-differential solution;

Float RTK: RTK float solution;

Fixed RTK: RTK fixed solution.

Yellow color denotes extrapolated solution or smoothed transition from one type of solution to other type.


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3.4.1 Configuring Base Station

Select SettingsSet reference ECEF coordinates or Set receiver operation mode (Figure 10).

Figure 10. Selecting receiver operation mode

Option 1: to set antenna reference ECEF coordinates.

Select Operation modecoordinates hold, enter WGS-84 XYZ reference coordinates of the point where GNSS antenna is placed (Figure 11).

Figure 11. Coordinates hold mode settings

Click Ok, then solution type indicator will turn to Hold, and configuration indicator will show Base (Figure 12).

Figure 12. Indication of coordinates hold mode


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Option 2: to use averaged coordinates calculated by the GNSS module.

Select Operation modesurvey-in, set survey-in interval value (in minutes) in the range of 15 to 1440 (Figure 13). Recommended value is 60 minutes.

Figure 13. Survey-in mode settings

Click Ok, then solution type indicator will show Single, and configuration indicator Base will start counting down (Figure 14).

Figure 14. Survey-in mode interval count down

As soon as specified survey-in interval is completed, solution type indicator will turn to Hold as shown in Figure 12 and start transmitting differential corrections.

3.4.2 Checking Reception of RTCM Corrections

Select QueriesRTCM messages reception statistics.

Figure 15. Request RTCM messages reception statistics


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Figure 16. RTCM messages reception statistics window

3.4.3 FW Update

For updating GeoS-5 RTK® module firmware, select CommandsUpdate FW.

Figure 17. Selecting FW update

Choosing Update FW opens panel for browsing FW update file to download (Figure 18). The FW file has the following format: RTKgeos5_xxx.bin. Select the file and click Open.


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Figure 18. Browsing the FW file to download

After browsing the FW file, the program will start updating process as shown in Figure 19.

Figure 19. FW update progress

Wait till panel shown in Figure 20 appears and click ОК.

Figure 20. Firmware update complete

3.5 Direct Hardware Access to GeoS-5 RTK®

For direct access to GeoS-5 RTK® module without UHF communication, use AUX connector signals in following way:

Disconnect EVB’s USB port from PC;

Apply DC voltage 4.7 to 26 V to pin 19 (V_IN);

Connect pin 15 (RF_RST) to the ground;

Use Port #0 signals TX0 (pin 10) and RX0 (pin 11) for communication with module using binary data;

Port #1 signals:

o Use TX1 (pin 12) for getting access to differential corrections stream (Base station) or NMEA messages (Rover);

o Use RX1 (pin 13) for applying differential corrections (Rover).


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3.6 Recommended GNSS Antenna Placement

Since RTK technology allows calculating position of the object with centimeter-level accuracy, it is more sensitive to the GNSS antenna placement conditions, in contrast to standard accuracy GNSS modules.

Examples of recommended GNSS antenna placement are depicted in Figure 21.

Figure 21. Example of GNSS antenna placement

Recommended environment:

Open sky, elevation angle mask not less 15 degrees above horizon. Absence of objects nearby: buildings, cars, trees, people, etc.

In case of using not geodetic-quality GNSS antenna, use a ground plane for reducing multipath effects: a metal sheet with a radius not less 10 cm, a metal roof of a building or a machine can be used as the ground plane.

Ensure that other electronic devices are not located close to the GNSS antenna.

horizon

horizon


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4 EVB Schematic Diagram and BOM

Figure 22. EVB schematic diagram


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Table 3. BOM

Designator Part number

A1 CR2032 battery holder

A2 GeoS-5 RTK

C4 C6 C7 C12 C14 C15 C17 C18 C19 C21 Capacitor X7R 0603 0.1uF 25V 5%

C3 Capacitor X5R 0805 4.7uF 50V 10%

C8 Capacitor NPO 0603 1.2pF 50V ±0.1pF

C20 Capacitor NPO 0603 100pF 50V 5%



C10 C11 C22 Capacitor X5R 0805 47uF 6.3V 20%

C2 Capacitor X5R 0603 10uF 16V 20%

C1 C13 C16 C24 Capacitor X7R 0603 1.0uF 10В 10%

D1 TPS5401DGQT

D11 FT2232HQ

D9 AT93C46D-TH

D6 D7 NC7SZ08M5X

D10 SN65220DBVRQ

D2 D5 SN74AVC4T774RSVR

D8 LE50-433

D3 D4 TS3A24159DGSR

G1 Quartz oscillator ASE-12.000MHz-L-C

L1 Inductor CDRH8D43NP-470NC

R14 Resistor 0603 0 0.1W

R2 R3 R12 R213 R15 R16 R17 R20 R21 R22 Resistor 0603 10k 0.1W 5%

R1 Resistor 0603 22 0.1W 1%

R11 Resistor 0603 10k 0.1W 1%

R5 R10 Resistor 0603 33.2k 0.1W 1%

R4 Resistor 0603 274k 0.1W 1%

R6 R7 R8 R9 Resistor 0603 270 0.1W 5%

R23 Resistor 0603 12.1k 0.1W 1%

R18 Resistor 0603 1k 0.1W 5%

R19 Resistor 0603 2k 0.1W 5%

S1 Pushbutton FSMRA6JH

S2 Switch SMTS-102-2C4

V1 V2 LED indicator L-7104MD/2GD

VD1 VD2 VD3 Diode PMEG6030EP, 115

VD11 Diode BAS70-05W, 115

X1 Connector mini-USB MUBRS1-05SN (CONEC)

X2 Connector IDC2.0-20MR

X3 X4 Connector SMA 73251-1290 (MOLEX)


Rev. 1.0 11.07.2018 of 21

5 EVB Assembly Drawing

Figure 23. EVB assembly drawing

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