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Doc. No: Unex-QSG-21-002

 

 

 

 

12/21

 

A printed version of this document is an uncontrolled copy

 

© 2023 Unex Technology Corporation – Company Confidential

 

8.4. 

GNSS 

       

Figure 7: GNSS antenna port and GNSS antenna 

RSU-352 provides one GNSS antenna connector. This GNSS antenna port is Type-N. 

This GNSS port is surge protected (5KA min with 8/20 μs, 10KV min with 1.2/50 μs). 

An active GNSS antenna (EX-33) is also provided in RSU-352 package. 

For stable fix acquisition, at least 4 satellites with enough signal strength (C/N

0

 value 

above  30  dB-Hz)  are  required.  If  the  signal  strength  goes  below  30  dB-Hz,  the  fix  will 

become unstable. 

8.4.1. 

GNSS Antenna Detection 

The antenna detection mechanism is a 2-step process: First check the signal strength. 

If the signal strength drops to zero, then check the antenna status flag. 

When all the C/N

0

 values becomes null, it means that the GNSS antenna or its cable 

may either become detached or damaged. The GNSS antenna port has a built-in antenna 

detection function. The detection mechanism is based on the current consumption of an 

active antenna (I

ANT

). If the active antenna consumes less current than 12 mA, then it is 

considered  as  the  OPEN  status;  if  the  antenna  consumes  more  than  58  mA,  then  it  is 

considered  as  the  SHORT  status.  Anything  between  12-58  mA  is  considered  as  the 

NORMAL status.   

The GNSS 3.3V antenna bias will be continuously supplied in OPEN/NORMAL status. 

Once the SHORT status is triggered, the SHORT flag will persist, and the 3.3V bias will be 

turned off until the reset of the GNSS module. After the reset of the GNSS module, the 

detection process will start all over again.   

GNSS ANT 

Type N 

Содержание RSU-352 Series

Страница 1: ...E stack 0A1 Reviewers Department Name Acceptance Date Note PD Nidor Huang 2023 03 24 RD P C Kang 2023 03 24 Modification History Revision Date Originator Comment 0 1 2021 08 23 Nidor Huang Creating do...

Страница 2: ...t is an uncontrolled copy 2023 Unex Technology Corporation Company Confidential Revision Date Originator Comment 0 8 2023 03 24 Nidor Huang Updating Unex logo Adding GNSS reset in Unex BSP interface s...

Страница 3: ...thernet 10 8 3 5 9GHz V2X 11 8 4 GNSS 12 8 4 1 GNSS Antenna Detection 12 9 Accessories 13 9 1 GORE Vent 13 9 2 Surge Protector 14 9 3 Cable Gland 14 9 4 Mounting Bracket 15 10 Dimensions and Weight 20...

Страница 4: ...ple illustration of RSU 352 mounting on a vertical mast post 18 Figure 15 Earth wire connection position left earth wire and earth wire screw right 19 Figure 16 Mounting bracket dimensions 20 Figure 1...

Страница 5: ...ed warranty extends only to the original customer of the product Customer s sole and exclusive remedy and the entire liability of Unex under this limited warranty will be at Unex s option return for r...

Страница 6: ...bling installing When operating under extreme temperature conditions environmental control measures e g heating cooling should be considered Always make sure the metal enclosure is connected to a well...

Страница 7: ...1 002 7 21 A printed version of this document is an uncontrolled copy 2023 Unex Technology Corporation Company Confidential Figure 1 RSU 352 series package content Figure 2 RSU 352 series complete ass...

Страница 8: ...oE 1 60 V V2X maximum input level 10 dBm GNSS maximum input level 10 dBm Note 1 Powered by an 802 3af at PSE Note 1 Operation outside the Absolute Maximum Ratings may cause permanent device damage Abs...

Страница 9: ...wer Spectrum mask Class C 20 dBm GNSS antenna gain Antenna Gain 2 4 3 2 85 4 dBic LNA Gain 5 24 27 30 dB GNSS sensitivity C N0 Acquisition 22 30 45 dB Hz GNSS antenna bias IANT 20mA 3 0 3 3 V GNSS ant...

Страница 10: ...atus LED Figure 4 Status LED Table 4 LED function LED Status Description Blinking Green Start up Solid Green Operational Amber FW upgrade Red Fault Note Please see TABLE 8 UNEX BSP INTERFACE SETTINGS...

Страница 11: ...X antennas EX 53 RSU 352 provides two 5 9GHz V2X antenna connectors Receptacle connectors are Type N These V2X ports are surge protected 5KA min with 8 20 s 10KV min with 1 2 50 s A pair of Type N V2X...

Страница 12: ...l strength If the signal strength drops to zero then check the antenna status flag When all the C N0 values becomes null it means that the GNSS antenna or its cable may either become detached or damag...

Страница 13: ...ksum cr lf where status can be 0 The antenna current is in the normal range NORMAL 1 The antenna current is below the normal range OPEN 2 The antenna current is above the normal range SHORT Table 6 GN...

Страница 14: ...he surge protector over the PoE port until fastened Figure 9 PoE surge protector 9 3 Cable Gland To ensure weather resistance always connect the Ethernet cable with the cable gland on the cable outlet...

Страница 15: ...mast post should be between 78 101mm The total weight of RSU 352 including antennas PoE surge protector mounting bracket earth wire and cable gland is about 2 7 kg Before installation always make sur...

Страница 16: ...the actual earth potential before connecting the earth wire 2 2 The earth wire should be connected to a metal structure with less than 10 ohms of earthing resistance 2 3 Connect the earth wire green...

Страница 17: ...on of this document is an uncontrolled copy 2023 Unex Technology Corporation Company Confidential Figure 12 RSU 352 mounting bracket assembly vertical steps Figure 13 An example illustration of RSU 35...

Страница 18: ...x QSG 21 002 18 21 A printed version of this document is an uncontrolled copy 2023 Unex Technology Corporation Company Confidential Figure 14 An example illustration of RSU 352 mounting on a vertical...

Страница 19: ...9 21 A printed version of this document is an uncontrolled copy 2023 Unex Technology Corporation Company Confidential Figure 15 Earth wire connection position left earth wire and earth wire screw righ...

Страница 20: ...002 20 21 A printed version of this document is an uncontrolled copy 2023 Unex Technology Corporation Company Confidential 10 Dimensions and Weight Figure 16 Mounting bracket dimensions Figure 17 Mec...

Страница 21: ...applicable for Unex software package only Table 8 Unex BSP interface settings Function Description Ethernet Default IP address 192 168 100 3 GNSS NMEA UART1 230400bps 8N1 ttyAMA1 GNSS Reset GPIO111 0...

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