Furuno GF-8801 Bedienungsanleitung

www.furuno.com

Multi-GNSS

Disciplined Oscillator

Model

GF-8801, GF-8802,

GF-8803

Hardware Specifications

(Document No. SE19-410-006-00)

GF-8801, GF-8802, GF-8803

Hardware Specifications

SE19-410-006-00

IMPORTANT NOTICE

No part of this manual may be reproduced or transmitted in any form or by any means, electronic or

mechanical, including photocopying and recording, for any purpose without the express written permission of

the publisher, FURUNO ELECTRIC CO., LTD.

Any information of this documentation shall not be disclosed to any third party without permission of the

publisher, FURUNO ELECTRIC CO., LTD.

The following satellite systems are operated and controlled by the authorities of each government.

- GPS (USA)

- GLONASS (Russia)

- Galileo (Europe)

- QZSS (Japan)

- SBAS (USA: WAAS, Europe: EGNOS, Japan: MSAS, India: GAGAN)

Thus FURUNO is not liable for the degradation of the above systems so therefore FURUNO cannot guarantee

specification based on their conditions. By solar flare or coronal mass ejection due to solar surface activity,

depending on the scale, there is a possibility that a decrease in reception sensitivity or deterioration in

precision may be temporarily observed. User is expected to be familiar with the System and make full use of it

with their own responsibility.

Although this product is paying attention to compatibility with the past products, due to the correspondence to

various additions of specifications, some actions may differ unavoidably. Regarding the specifications, the

contents described in this document are set as true, and for items not described in this document, the actual

operations of this product are set as true. For this product, if you need items compatible with past products,

please consult us before mass-producing this product.

We pay through attention about the software of this product. But, if perchance you found a bug or a trouble,

please feel free to contact us directly. We will check it, and if it is a bug, we may send you a new version with a

bug fix. If perchance we found a bug or a trouble, we may send you a new version after we contact you.

When we send you the new version software, we may ask you to update software. Therefore, we strongly

recommended being able to access to serial port of this product from outside of your product to make software

update easy. In addition, we also strongly recommend connecting between serial port of this product and

network to remote access and update software.

In this product, FURUNO can ensure safe performance only the commands and the sentences which are

written in this document or are written in the document for this product. Please do not use the commands of the

others products, otherwise this product may have troubles and FURUNO may not support about the troubles.

FURUNO may inform some internal commands for verification etc. In this case, please use the commands only

for operation test and please do not use them for technical operation.

FURUNO ELECTRIC CO., LTD. reserves the right to make changes to its products and specifications without

notice.

GF-8801, GF-8802, GF-8803

Hardware Specifications

SE19-410-006-00

Revision History

Version

Change contents

Date

Initial release

2019.4.18

GF-8801, GF-8802, GF-8803

Hardware Specifications

SE19-410-006-00

Table of Contents

1Outline······················································································································1

2Function Overview······································································································1

3GNSS General Performance ·························································································2

41PPS and Clock (VCLK, GCLK) Signal Specifications ······················································5

4.1 1PPS··························································································································· 6

4.2 Clock (VCLK)················································································································ 8

4.3 Clock (GCLK) ··············································································································· 9

5Time to FINE LOCK··································································································· 10

6Phase Relation between PPS and VCLK······································································· 10

7Environment Robustness Performance········································································ 11

8Operation Restriction································································································ 11

9I/O Signal Description································································································ 12

9.1 I/O Signal Description ··································································································12

9.2 Pin Arrangement··········································································································13

9.3 Alarm Signal (ALM_N)··································································································13

9.4 Lock Signal (LOCK) ·····································································································13

9.5 PPS Input Signal for External Synchronization (EPPS)·····················································14

9.6 Backup Power Supply (VBK)·························································································14

9.7 RF_COAX and RF_PIN··································································································14

10 Electrical Characteristics··························································································· 15

10.1 Absolute Maximum Rating····························································································15

10.2 Power supply ··············································································································16

10.3 Reset··························································································································17

10.4 Interface Signal ···········································································································17

10.5 Baud Rate and Error ····································································································18

10.6 UART Wake-up Timing ·································································································19

10.7 Recommended GNSS Antenna······················································································20

10.8 Antenna Amplifier Power······························································································20

11 RoHS ······················································································································21

12 Flame Retardancy Rank·····························································································21

13 FIT·························································································································· 21

14 Reliability Test··········································································································21

15 Soldering Condition··································································································21

16 Equivalent Circuit ·····································································································22

17 Mechanical Specifications··························································································22

18 Packaging················································································································24

19 Warranty·················································································································· 25

20 Special Attention ······································································································26

20.1 Precautions for Use ·····································································································26

20.2 Electronic Component··································································································26

20.3 Precautions at Mounting·······························································································26

20.4 Precautions on Industrial Property Rights ······································································27

20.5 Export Control for Security ···························································································27

GF-8801, GF-8802, GF-8803

Hardware Specifications

SE19-410-006-00

1 Outline

This document describes the hardware specifications of GF-8801, GF-8802 and GF-8803 which is the GNSS

Disciplined Oscillator (GNSSDO). This document uses GNSS as general term of GPS, GLONASS, Galileo and

QZSS.

2 Function Overview

This product is a GNSSDO that can provide PVT (Position, Velocity and Time) information. Figure 2-1 shows

the block level diagram. Main features are as follows:

Supports GPS, GLONASS, Galileo, QZSS (L1C/A, L1S) and SBAS.

Provides 1PPS with high accuracy and stability synchronized with GPS time or UTC time.

Provides clock signal (VCLK 10MHz) synchronized with 1PPS.

Software upgrade capability by Flash ROM.

Active Anti-Jamming capability to suppress effects of CW jammers.

Effects Multi-path mitigation.

GNSS high sensitivity.

An expensive external power supply component is unnecessary since an LDO is built in.

Coaxial connector (RF_COAX) or IF connector (RF_PIN) for GNSS signal input are selectable.

GF-8701, GF-8702, GF-8703, GF-8801, GF-8802 and GF-8803 are pin compatible.1)

Notes:

1) The specifications of power consumption, PPS and 10 MHz are different.

Multi GNSS

receiver chip

eRideOPUS 7

Serial Flash

ROM

Antenna detection

block with over current

detection function

System power supply block

ITXD

IALM_N

ILOCK

IGCLK

Reset control

block

ESD

Protector

26MHz

TCXO block

10MHz

oscillator block

External

interface

block

VCC_XO

IRXD

IEPPS

VCLK

IRST_N

TXD

ALM_N

LOCK

GCLK

RXD

EPPS

RST_N

VANT

RF_COAX

VCC VBKVANT

3.3V

RF_PIN

Figure 2-1. GF-8801/02/03 block diagram

GF-8801, GF-8802, GF-8803

Hardware Specifications

SE19-410-006-00

3 GNSS General Performance

These performances are measured and evaluated under the environment shown in Figure 3-1. The

measurement conditions are default setting and 25°C constant (no wind). When the signal level mask is set,

the performance is limited by the mask.

Multi-GNSS Simulator

GSS6700 RF_COAX

External LNA

Gain: 30.4dB

NF: 0.6dB

Including

Cable Loss

GF-8801

GF-8802

GF-8803

NMEA sentence

TXD

Figure 3-1. Measurement platform

Table 3-1. Time To First Fix (TTFF)

Item

Specification

Note

TTFF (HOT)

< 5 sec

[*1] [*2]

TTFF (COLD)

< 35 sec

[*1] [*3]

Table 3-2. GPS performance

Item

Specification

Note

Signal type

GPS L1C/A

Channel

MAX 12

[*4]

HOT acquisition sensitivity

> -162 dBm

[*5]

COLD acquisition sensitivity

> -148 dBm

[*6]

Tracking sensitivity

> -162 dBm

Re-acquisition sensitivity

> -162 dBm

[*7]

GF-8801, GF-8802, GF-8803

Hardware Specifications

SE19-410-006-00

Table 3-3. GLONASS performance

Item

Specification

Note

Signal type

GLONASS L1OF

Channel

MAX 10

[*4]

HOT acquisition sensitivity

> -158 dBm

[*5]

COLD acquisition sensitivity

> -144 dBm

[*6]

Tracking sensitivity

> -158 dBm

Re-acquisition sensitivity

> -158 dBm

[*7]

Table 3-4. Galileo performance

Item

Specification

Note

Signal type

Galileo E1B/E1C

[*8]

Channel

MAX 8

[*4]

HOT acquisition sensitivity

> -136 dBm

[*5]

COLD acquisition sensitivity

> -136 dBm

[*6]

Tracking sensitivity

> -146 dBm

Re-acquisition sensitivity

> -136 dBm

[*7]

Table 3-5. QZSS L1C/A performance

Item

Specification

Note

Signal type

QZSS L1C/A

Channel

MAX 4

[*4] [*11]

HOT acquisition sensitivity

> -136 dBm

[*5]

COLD acquisition sensitivity

> -131 dBm

[*6]

Tracking sensitivity

> -147 dBm

Re-acquisition sensitivity

> -136 dBm

[*7]

GEO satellite

Available

SVID=199 is supported.

GF-8801, GF-8802, GF-8803

Hardware Specifications

SE19-410-006-00

Table 3-6. QZSS L1S performance

Item

Specification

Note

Signal type

QZSS L1S

[*9] [*12]

Channel

MAX 2

[*4]

COLD acquisition sensitivity

> -130 dBm

[*6]

Tracking sensitivity

> -134 dBm

Re-acquisition sensitivity

> -130 dBm

[*7]

SLAS

Available

[*10]

Table 3-7. SBAS performance

Item

Specification

Note

Signal type

SBAS L1C/A

SVID=120 to 138 are supported. [*9]

Channel

MAX 2

[*4] [*13]

Acquisition sensitivity

> -130 dBm

[*6]

Tracking sensitivity

> -139 dBm

Reacquisition sensitivity

> -130 dBm

[*7]

[*1] These are specified in the measurement environment shown in Figure 3-1. Simulator output level is set to -130 dBm.

[*2] The time from sending HOT restart command to re-acquisition

[*3] The time from sending COLD restart command to re-acquisition

[*4] Up to 32 channels are available for whole GNSS.

[*5] After sending HOT restart command during satellite receiving

[*6] After sending COLD restart command during satellite receiving

[*7] Within 250 seconds after the last signal receiving

[*8] Due to the composition of the message broadcast by Galileo, TTFF of Galileo may take about 100 seconds.

[*9] Only one of QZSS L1S and SBAS L1C/A can be used. They cannot be received at the same time.

[*10] SLAS correction is performed to GPS and QZSS.

[*11] Up to 4 satellites can be received simultaneously among 193, 194, 195, 196 and 199.

[*12] Up to 2 satellites can be received simultaneously among 183, 184, 185, 186 and 189.

[*13] WAAS, MSAS, EGNOS and GAGAN are supported.

GF-8801, GF-8802, GF-8803

Hardware Specifications

SE19-410-006-00

4 1PPS and Clock (VCLK, GCLK) Signal Specifications

The follow is the specifications of 1PPS and clock (GCLK, VCLK). Please refer to the eSIP Protocol

Specification for switching setting etc. The performance described in this chapter is measured and evaluated

under the environment shown in Figure 4-1 and 4-2 below. In the absence of any notes, measurement

conditions are default setting, open sky, constant at 25 degree (no wind).

GF-880X

Evaluation Board

GNSS rooftop

antenna

Universal counter

53132A

Reference GNSS DO

[*1] 1PPS

1PPS

10MHz

CH1

CH2

REF IN

phase

delay

Figure 4-1. 1PPS measurement environment

GF-880X

Evaluation Board

GNSS rooftop

antenna

Universal counter

53132A

Reference GNSS DO

[*1]

VCLK,GCLK

10MHz

CH1

REF IN

clock

Figure 4-2. Clock measurement environment

[*1] GNSSDO equipped with rubidium oscillator calibrated by USNO (United States Naval Observatory).

The definition of the terms is as follows.

MAX|TE|: It is a maximum time error (absolute value) of 1PPS for UTC time.

MTIE: Maximum time interval error. It is a relative MIN-MAX value of 1PPS.

SDEV, TDEV: Standard deviation and Time deviation. They show 1PPS fluctuation.

GF-8801, GF-8802, GF-8803

Hardware Specifications

SE19-410-006-00

4.1 1PPS

Table 4.1-1. 1PPS general specifications

Item

Specification

Note

Nominal frequency

1 Hz

Duty cycle

50 %

[*1]

Synchronization target

GPS, UTC

[*2]

[*1] The pulse width can be changed by PPS command. Please refer to the eSIP protocol specifications for details.

[*2] 1PPS is output in synchronization with GPS time or UTC time. Please refer to the eSIP protocol specifications for details.

Table 4.1-2. 1PPS output specifications [FINE LOCK]

Item

Specification

Note

1PPS accuracy

(MAX|TE|)

< 40 nsec

MIN-MAX value from UTC time / [*1][*2]

1PPS stability

(Standard deviation)

< 4.5 nsec

@ 1sigma / [*2][*3]

1PPS stability

(Time deviation)

G.8272 PRTC-B

compliant

@ 1sigma / [*2][*4][*6]

1PPS stability

(MTIE)

G.8272 PRTC-B

compliant

Relative MIN-MAX value / [*2][*5][*6]

[*1] It is necessary to adjust cable offset beforehand. In addition, it may be necessary to adjust the hardware offset of the entire

device incorporating this product.

[*2] After SS mode or CSS mode for more than 24 hours, or after TO mode via it

[*3] GF-8701 uses a TCXO as an internal oscillator. Please pay attention to the installation environment since it is particularly

susceptible to wind and temperature.

[*4] TDEV of G.8272 PRTC-B compliant means that it meets the following specifications.

Time deviation limit [nsec]

Observation interval τ [sec]

1<τ<100

0.01τ

100<τ<500

500<τ<100000

[*5] MTIE of G.8272 PRTC-B compliant means that it meets the following specifications.

MTIE limit [nsec]

Observation interval τ [sec]

0.275τ + 25

1<τ<55

55<τ

[*6] G.8272 PRTC-B compliant is GF-8802 and GF-8803 only. TDEV and MTIE of GF-8801 is G.8272 PRTC-A compliant.

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