The SIRD-TOD System performs the HQTS (Have Quick Timing System) function to acquire and disseminate the TOD (Time of Day) information needed by transceivers operating in the ECCM frequency hopping modes called Have Quick (HQ). This system also has the ability to generate standard frequency references for correcting the drift of HQ radio vector oscillators.



It allows the acquisition of the time signal from NAVSTAR, Galileo, Glonass constellation and subsequent distribution in HQ, IRIG, NTP formats;

It distributes the standard frequency signal from the Rubidium module to the user devices in the frequencies 1,2,5,10MHz and 800kHz;

It can be controlled and managed by local or remote operators through ONM100 (T³) compatible SNMP protocols.



Below is the block diagram of a typical configuration of the system in question. 

The SIRD-TOD System Distribution Management System acquires the necessary information from the NAVSTAR (GPS), Galileo or Glonass satellites through the Time Code Processor Unit.

The device allows to synchronize all frequencies and time codes to the UTC output with an error lower than 50/100 nsec.

The Time Code Processor Unit receives the information coming from the NAVSTAR constellation and transmits it in ToD format.

The Unit is equipped with a high stability rubidium oscillator that allows an autonomy of more than two years even in case of darkening of the sample signals emitted by satellites. The apparatus has a graphic display for the display of the TOD and the efficiency status of the input and output lines, moreover there is a digital keyboard for the local configuration of the apparatus.

It is foreseen the remote management of the device through LAN connection.

In case of lack or serious corruption of the GPS signal, the TOD distribution apparatus can receive the time data from the VHF-UTC Receiver, which, through the connection to the FM radio links of national broadcasting, acquire the time signal from Italian laboratories with cesium standard.

The 1PPS signal is the synchronism signal whose rising edge marks the cadence of one second of UTC time and regulates each ToD signal transmission apparatus in order to have a consistent time signal distribution on all transmission ports (wired, optical, LAN, etc.).

The hourly information received at each UTC pulse, regardless of the acquisition channel, is sent to the Management/Distribution Unit for consistency analysis with previous data and for conversion.




Power Supply Unit
Distribution Units
ToD Distribution Unit
 Time Code Processor Unit
VHF BackUP Unit
NTP Server






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