GNSS, GPS, Galileo, ALS162, DCF77 antenna
Antennas and accessories for time servers
For perfect control and quality, Bodet designs its own antennas and uses reception modules from leaders such as UBlox. The form of our antennas is specifically designed to optimise signal reception and ensure an excellent resistance to climate conditions
GPS antenna or radio antenna?
Advantages of the GPS antenna:
- Provides worldwide coverage
- Guarantees stability and precision of the time signal
- Synchronises our clocks, master clocks, and time servers
Advantages of the radio antenna:
- Facilitates installation thanks to an antenna positioned inside the building
- More economical than the GPS antenna
Satellite Antennas
Bodet offers 4 types of antennas: Single Constellation Antenna (GPS or Galileo or GLONASS), Multi Constellation GNSS Antenna and a GNSS Interface.
| Type | Signals | Usage | Installation | Options | Advanced functions |
|---|---|---|---|---|---|
 Single constellation antenna |
GPS or Galileo or GLONASS | Synchronisation with low timing constraint (Millisecond) | Exterior (roof). Protection index IP67, IK04 |
Lightning arrester | / |
 Multi constellation antenna |
GPS, Galileo, BeiDou, GLONASS | Synchronisation with high timing constraint (Nanosecond) | Exterior (roof). Protection index IP67, IK04 |
Lightning arrester | / |
 Multi constellation antenna |
GPS, Galileo, BeiDou, GLONASS | Synchronisation with high timing constraint (Nanosecond) | Exterior (roof). Protection index IP67, IK04 |
Lightning arrester | Anti-Jamming Anti Spoofing |
 Multi Constellation Interface |
GPS, Galileo, BeiDou, GLONASS | Synchronisation via existing client antenna | Indoor (technical facility). Protection index IP41 |
/ | / |
Which satellite antenna to choose?
Our single constellation antennas receive signals from one constellation (GPS, Galileo or GLONASS) in a wide spectrum (omnidirectional coverage in space). They are easy to install and are sufficient for non-critical or non-sensitive applications.
If time reference is a sensitive data for the proper operation of your infrastructure (finance, transport, video surveillance, access control, etc.), you should consider a more comprehensive and effective solution.
Our multi-constellation antennas can receive signals from several positioning systems, thus offering greater accuracy. Besides, combining signals from several constellations ensures that the signal remains available, even under limited visibility conditions or in presence of obstacles, for example in an urban environment.
Eventually, in the context of critical applications, an anti-jamming and anti-spoofing multi-constellation antenna helps to maintain the integrity of the time signal. Indeed, interference is possible (whether unintentional from other transmitters such as communication towers or intentional from illegal “jammers”). As a result, interference can disrupt the reception of the satellite signal. This antenna has been specially designed to avoid such interference and guarantees optimum time synchronisation
Radio Antenna
Bodet offers two types of antennas: ALS162 Antenna (French Transmitter), DCF77 Antenna (German Transmitter)
| Type | Signals | Usage | Installation |
|---|---|---|---|
 ALS antenna |
ALS162 | Synchronisation with low timing constraint (Millisecond) | For indoor or outdoor use. Protection index IP53, IK04 |
DCF antenna |
DCF77 | Synchronisation with low timing constraint (Millisecond) | For indoor or outdoor use. Protection index IP53, IK04 |
GPS rollover phenomenon
What is GPS rollover?
The GPS date in a GPS module is calculated on a "week number" database sent by the GPS satellites.
The "week number" represents the number of weeks since 6 January 1980 (origin of GPS time). This data allows a GPS module to calculate its UTC calendar. The "week number" is encoded in 10 bits, which represents a maximum of 1,024 weeks. Every 19.6* years, rollover is inevitable.
* 19,6 = 1024/52
What are the impacts on your products?
Certain Bodet products (such as the Sigma master clock) will be affected and will no longer have the correct date. Rollover will cause disturbances on time and season changeovers.
When will I be affected by rollover?
You have a Bodet GPS antenna with one of the following references:
- 907030 ANTENNE GPS AV SUPPORT ROTULE
- 907032 ANTENNE GPS SANS SUPPORT 20M
- 907033 ANT GPS + CONNECTEUR SS SUP.10M
- 907035 ANTENNE GPS 2 AVEC CABLE 20M
- 907036 ANT GPS 4 BOIT. NOIR + CABLE 2M
- 907037 ANT GPS 4 AVEC CABLE 20M
- 907042 ANT GPS 5 AVEC CABLE 20M
Your order is before 31/08/2015
- Rollover date: October 2018
- You can order our new GPS antenna: 907047 ANTENNE GPS 6 CABLE 20M.
Your order is after 01/09/2015
- Rollover date: August 2030
- Case 1
You can keep your antenna, but you will need to add our Rollover interface by ordering the reference: 408203 INTERFACE ROLLOVER GPS.
Case 2
You can order our new GPS antenna: 907047 ANTENNE GPS 6 CABLE 20M.
You have a GPS-DCF antenna with one of the following references:
- 907038 ANT GPS-DCF PROG CABLE 20M
- 907039 ANT GPS-DCF UTC CABLE 20M
Your order is before 31/12/2015
- Rollover date: April 2019
- Case 1
You can order our new GPS-DCF antenna: 907048 ANTENNE GPS-DCF 6 PROG.
Case 2
You can order our new GPS/DCF antenna: 907049 ANTENNE GPS-DCF 6 UTC.
Your order is between 01/01/2016 and 31/10/2017
- Rollover date: April 2019
- Because our antennas will be under warranty when the problem occurs, Bodet will send the new GPS-DCF antenna to you. To receive it, please contact our sales department.
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