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NEO-D9S and ZED-F9

configuration

SPARTN L-band correction data reception

Application Note



Abstract

This document explains how to configure the NEO-D9S correction data receiver together with ZED-

F9 high precision modules in order to receive and use SPARTN L-band correction data.

NEO-D9S and ZED-F9 configuration

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Document information

Title NEO-D9S and ZED-F9 configuration

Subtitle SPARTN L-band correction data reception

Document type Application note

Document number UBX- 22008160

Revision and date R02 27-Jul-2022

Disclosure restriction C1-Public

☞Check if the ZED-F9 product that you are using supports the SPARTN protocol and the related

configurations.

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NEO-D9S and ZED-F9 configuration

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Contents

Document information................................................................................................................................2

Contents ..........................................................................................................................................................3

1Introduction.............................................................................................................................................4

2NEO-D9S configuration .......................................................................................................................6

2.1 L-band point to multipoint (PMP) configuration ..................................................................................6

2.2 Interface configuration .............................................................................................................................. 6

2.3 Functional check ......................................................................................................................................... 7

3ZED-F9 configurations.........................................................................................................................8

3.1 L-band configuration.................................................................................................................................. 8

3.2 Interface configuration .............................................................................................................................. 8

3.3 Dynamic keys ...............................................................................................................................................9

3.4 Functional check ......................................................................................................................................... 9

4Example configuration for PointPerfect..................................................................................... 11

4.1 NEO-D9S L-band configuration .............................................................................................................11

4.2 Setting ZED-F9 keys ................................................................................................................................11

AGlossary ................................................................................................................................................. 16

Related documentation ........................................................................................................................... 17

Revision history.......................................................................................................................................... 17

Contact.......................................................................................................................................................... 17

NEO-D9S and ZED-F9 configuration

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1Introduction

The ZED-F9 high precision modules have integrated multiband PPP-RTK technology for centimeter-

level accuracy using SPARTN [8] State Space Representation (SSR) type of correction.

SSR services rely on a GNSS reference station network to model key errors (such as satellite or

atmospheric errors) over large geographical regions and provide corrections to the rover via broadcast

link such as internet or satellite L-band, all receivers receive the same data over a large area.

☞Check if the ZED-F9 product that you are using supports the SPARTN L-band stream formatted

as UBX-RXM-PMP messages, and the related configurations.

Figure 1 represents how NEO-D9S and ZED-F9 work together:

Figure 1: NEO-D9S and ZED-F9 scenario

NEO-D9S is a satellite data receiver for L-band correction broadcasts, which can be configured to

work with a variety of correction services. This document provides instructions on how to configure

NEO-D9S for this purpose and provides configuration examples for the PointPerfect service, SPARTN

L-band correction, and ZED-F9 receivers. Figure 2 represents the NEO-D9S and ZED-F9 connection:

Figure 2: NEO-D9S and ZED-F9 connection

The NEO-D9S and ZED-F9 receivers follow the u-blox configuration concept. The UBX-CFG-VALSET,

UBX-CFG-VALGET, and UBX-CFG-VALDEL messages can be used to configure the SPARTN L-band

correction data reception. See the D9 PMP 1.04 Interface description [4] and the F9 HPG 1.32

Interface description [5] for further details.

For the correction data, NEO-D9S and ZED-F9 can be connected via their respective UART2

interfaces, as shown in Figure 2. The UART2 connection is commonly used and recommended for

customer designs, while The UART1 can be used as the main host interface for configuration,

NEO-D9S and ZED-F9 configuration

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monitoring, and control. The USB interface is provided for host communication purposes and can be

used for monitoring or logfiles collection.

Figure 3 shows the series of actions to be done:

Figure 3: ZED-F9 and NEO-D9S configuration sequence diagram

Configuration strings are provided in the following sections of the document for each configuration

item. If you are using u-center, the strings can be sent via a custom message:

Figure 4: Send Custom message with u-center

For more details, see the u-center user guide [3].

The easiest way to test how to configure the NEO-D9S and ZED-F9 receivers is to make use of the

C099-F9P and C101-D9S application boards. See the related user guides [6] and [7], and in particular

Chapter 4 of the C101-D9S User Guide.

NEO-D9S and ZED-F9 configuration

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2NEO-D9S configuration

NEO-D9S needs to be configured to receive SPARTN L-band correction data and forward these,

encapsulated in UBX-RXM-PMP messages, to the ZED-F9 receiver via UART2.

2.1 L-band point to multipoint (PMP) configuration

Table 1 lists the NEO-D9S L-band default conﬁguration values, which will vary depending on the

service provider. Once the related values have been obtained from the service provider, they can be

set accordingly with the UBX-CFG-VALSET configuration messages (see the interface description [4]

for further details).

Configuration item

Value

CFG-PMP-CENTER_FREQUENCY

1539812500 Hz

CFG-PMP-SEARCH_WINDOW

2200 Hz

CFG-PMP-USE_SERVICE_ID

1 (true)

CFG-PMP-SERVICE_ID 50821

CFG-PMP-DATA_RATE

2400 (B2400) bps

CFG-PMP-USE_DESCRAMBLER

1 (true)

CFG-PMP-DESCRAMBLER_INIT

23560

CFG-PMP-USE_PRESCRAMBLING

0 (false)

CFG-PMP-UNIQUE_WORD

0xe15ae893e15ae893

Table 1: NEO-D9S L-band default configuration values

Section 4 outlines how to obtain the L-band configuration values for the PointPerfect service.

2.2 Interface configuration

Table 2 shows the configuration items needed to configure the UART2 interface of NEO-D9S so that

it can communicate with the ZED-F9.

Configuration item

Value

CFG-UART2OUTPROT-UBX

1 (true)

CFG-UART2-BAUDRATE 38400

Table 2: NEO-D9S UART2 configuration items

To facilitate the configuration, examples of the configuration strings for RAM and Flash layers are

shown here:

RAM layer configuration string:

b5 62 06 8a 11 00 00 01 00 00 01 00 53 40 00 96 00 00 01 00 76 10 01 54 ef

Flash layer configuration string:

b5 62 06 8a 11 00 00 04 00 00 01 00 53 40 00 96 00 00 01 00 76 10 01 57 1f

When sending Flash layer configuration strings, the receiver needs to be restarted to apply them in RAM.

The UBX-RXM-PMP message is enabled by default in the output to the NEO-D9S UART2 interface.

NEO-D9S and ZED-F9 configuration

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2.3 Functional check

Firstly, some initial functional checks are required to verify that NEO-D9S is operating correctly:

•NEO-D9S communication has been established (e.g., via u-center) through UART1 or USB

•The L-band antenna is plugged in

•The L-band and interface configurations have been sent

•The UBX-RXM-PMP message can be used to check the received correction data (Figure 5)

•The UBX-MON-TXBUF message can be used to check the data sent via UART2 (Figure 6)

Figure 5 and Figure 6 show the messages as they appear in u-center.

Figure 5: UBX-RXM-PMP message in u-center

Figure 6: UBX-MON-TXBUF message in u-center

NEO-D9S and ZED-F9 configuration

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3ZED-F9 configurations

ZED-F9 needs to be configured to receive and use the SPARTN L-band correction stream, in the form

of UBX-RXM-PMP messages from NEO-D9S.

3.1 L-band configuration

The CFG-SPARTN-USE_SOURCE configuration key needs be set to LBAND:

Configuration item

Value

CFG-SPARTN-USE_SOURCE

1 - LBAND

Table 3: ZED-F9 configurations for SPARTN L-band data reception

The configuration strings for RAM and Flash layers are:

RAM layer configuration string:

b5 62 06 8a 09 00 00 01 00 00 01 00 a7 20 01 63 6c

Flash layer configuration string:

b5 62 06 8a 09 00 00 04 00 00 01 00 a7 20 01 66 84

When sending Flash layer configuration strings, the receiver needs to be restarted to apply them in RAM.

3.2 Interface configuration

The UBX protocol needs to be enabled on the ZED-F9 UART2 input:

Configuration item

Value

CFG-UART2INPROT-UBX

1 (true)

Table 4: ZED-F9 UART2 configuration item

☞For some ZED-F9 receivers, the UBX input protocol is already enabled by default on UART2. For

example, it is enabled by default on ZED-F9P with firmware HPG 1.32. Check the default interface

configuration for your ZED-F9 receiver in the related interface description.

The configuration strings for RAM and Flash layers are:

RAM layer configuration string:

b5 62 06 8a 09 00 00 01 00 00 01 00 75 10 01 21 b6

Flash layer configuration string:

b5 62 06 8a 09 00 00 04 00 00 01 00 75 10 01 24 ce

When sending Flash layer configuration strings, the receiver needs to be restarted to apply them in RAM.

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3.3 Dynamic keys

ZED-F9 may require proper keys to decrypt a SPARTN data stream. Once the key or keys are

obtained from the correction service provider, the UBX-RXM-SPARTNKEY message needs to be

formatted and sent to the ZED-F9 receiver. The following is an example of a UBX-RXM-SPARTNKEY

construction for the PointPerfect service. For more details, read about UBX-RXM-SPARTNKEY in

the interface description [5].

The following shows a UBX-RXM-SPARTNKEY construction example for PointPerfect:

b5 62 02 36 00 2c 01 02 00 00 00 10 88 08 4d 82 04 00 00 10 88 08 ce 29 05 00 XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX

XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX de 77

☞The keys are not stored in non-volatile memory and will be deleted on every module reset or restart.

In such cases, the keys need to be re-entered.

3.4 Functional check

Firstly, some initial functional checks are required to verify that ZED-F9 is operating correctly:

•ZED-F9 communication has been established (e.g., via u-center) through UART1 or USB

•The GNSS antenna is plugged in

•The L-band and interface configurations have been sent, as well as the dynamic keys

•The ZED-F9 UART2 has been connected to the NEO-D9S UART2

Then, the UBX-MON-COMMS message can be enabled to verify that UBX messages are received on

the ZED-F9 UART2, including UBX-RXM-PMP:

Figure 7: UBX-MON-COMMS message in u-center

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The UBX-RXM-COR message can be enabled to check if SPARTN corrections, encapsulated in UBX-

RXM-PMP messages, are being received, decrypted, and used (in the red square) by the ZED-F9

receiver:

Figure 8: UBX-RXM-COR message in u-center

If all these checks pass, the ZED-F9 receiver should go into an RTK fix or float solution depending on

the satellite visibility and environmental condition:

Figure 9: Position and status visualization windows in u-center

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