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{{Article Infobox2
{{Article Infobox2
|Category=Fundamentals
|Category=Fundamentals
|Title={{PAGENAME}}
|Authors=J.A Ávila Rodríguez, University FAF Munich, Germany.
|Authors= J.A Ávila Rodríguez, University FAF Munich, Germany.
|Level=Advanced
|Level=Advanced
|YearOfPublication=2011
|YearOfPublication=2011
|Title={{PAGENAME}}
}}
}}
In this article are described the signals corresponding to the Indian Regional Navigational Satellite System (IRNSS), which is a regional satellite navigation system owned by the Indian government. The system is being developed by Indian Space Research Organization (ISRO).


The final definition of all the IRNSS signals has not been concluded yet and investigations are still on course. We summarize in the next table the first proposal for the Signal and Frequency Plan presented in November 2006 during the First ICG Meeting in Vienna.
In April 2016, with the last launch of the constellation's satellite, IRNSS was renamed Navigation Indian Constellation (NAVIC) by India’s Prime Minister Narendra Modi.<ref> [http://gpsworld.com/with-irnss-1g-launch-india-completes-and-renames-its-navigation-constellation/ With IRNSS-1G launch, India completes and renames its navigation constellation]</ref>


::::[[File: QZSS_Sig_Plan_Table_2.png|none|thumb|580px|'''''Table 1:''''' IRNSS L5 Band technical characteristics.]]
The messaging service signals from the Indian Regional Navigation Satellite System (IRNSS) are broadcast in L5 and S band frequencies. The carrier frequency and the bandwidth of transmission for the messaging service are:<ref name="IRNSS ICD">[https://www.isro.gov.in/sites/default/files/article-files/irnss-programme/sis_icd_irnss1a_incois_isro_v1.1_19jul2019.pdf IRNSS Signal-In-Space ICD v1.1]</ref>


Given the similarity with the Galileo signals in terms of services that IRNSS might be providing, the same convention as for Galileo was employed. That is A for the PRS and B and C for the Open Service data and pilot signals respectively. Furthermore, the spectral properties of the IRNSS signal would be as follows:
{| class="wikitable" align="center"
|+align="bottom" |''IRNSS Carrier Frequencies and bandwidths''
|-
! Signal
! Carrier Frequency
! Bandwidth   
|- align="center"  
| L5
| 1176.45 MHz
| 24 MHz (1164.45 -1188.45 MHz)
|- align="center"
| S
| 2492.028 MHz
| 16.5 MHz (2483.778 - 2500.278 MHz) 
|- align="center"
| L1
| 1575,42 MHz
| 24 MHz (1551,42 - 1599,42 MHz)
|}


::::[[File: QZSS_Sig_Plan_Fig_1.png|none|thumb|580px|'''''Figure 1:''''' Spectra of IRNSS Signals in the E5b band.]]
In the following figures are shown the L5 and S bands in the spectrum of Radio Navigation Satellite Services.  


::::[[File: IRNSS_L5band.png|none|thumb|580px|'''''Figure 1:''''' Spectrum for Radio Navigation Satellite Services in L Band.<ref name="IRNSS ICD"/>]]


To conclude, it is interesting to mention that the Indian Satellite Navigation Programme has been doing much work in the past years on ionospheric and tropospheric modelling in the Region of India what could mean that IRNSS does not plan to use dual frequency at least in the first generation.  
::::[[File: IRNSS_Sband.png|none|thumb|280px|'''''Figure 2:''''' Spectrum for IRNSS Signal in S Band.<ref name="IRNSS ICD"/>]]


Moreover, India also plans to transmit similar signals for the S-band to those we have just described for the L5 band. The carrier frequency of S-band is at 2491.75 MHz. The modulation schemes and data rates would be the same as for L5 but no final decision on the other parameters has been made yet. In addition, it seems that India also plans to transmit signals in L1 as announced during the second Meeting of the ICG in India, in 2007.
Given the similarity with the Galileo signals in terms of services that IRNSS might be providing, the same convention as for Galileo was employed. That is A for the PRS and B and C  for the Open Service data and pilot signals respectively.


As a summary of the studied regional satellite systems so far, the signal plan IRNSS is shown in the next figure:
Moreover, India also transmits similar signals for the S-band to those we have just described for the L5 band. The carrier frequency of S-band is at 2491.75 MHz. The modulation schemes and data rates are the same as for L5 (BPSK(1) and BOC(5,2)). In addition, India has started to transmit signals in L1 as it was announced during the second Meeting of the ICG in India, in 2007. Two L1 signals are also added on the last IRNSS satellites: one L1 MBOC and a BPSK(n) shifted from 18.414 MHz above L1. They are compatible with other L1, L5 and S GNSS Open signals. In addition, has introduced NeQuick-N model for Ionospheric delay modeling in L1-SPS signal, removing the need of having an additional SBAS channel only for Ionospheric corrections over Indian region for receiving the error correction values<ref>Update on NavIC Signal Monitoring Receiver and The Advantage of NavIC L1 SPS 2017, by Saumi S., Rohan S. Urdhwareshe, Saurabh Bhalla, Rakesh Kr. Bijarniya and Sagar Subudhi </ref>


::::[[File: QZSS_Sig_Plan_Fig_4.png|none|thumb|580px|'''''Figure 1:''''' IRNSS planned signals.]]


==References==
==References==
<references/>
<references/>
== Credits ==
The initial information presented in this NAVIPEDIA’s article was an extract of the PhD work performed by Dr. Jose Ángel Ávila Rodríguez in the FAF University of Munich as part of his Doctoral Thesis “On Generalized Signal Waveforms for Satellite Navigation” presented in June 2008, Munich (Germany)
This article has been updated by GMV considering the information stated in the latest IRNSS Signal Interface Specification.


[[Category:Fundamentals]]
[[Category:Fundamentals]]
[[Category:GNSS Signals]]
[[Category:GNSS Signals]]
[[Category:IRNSS]]
[[Category:IRNSS]]

Latest revision as of 05:57, 12 July 2024


FundamentalsFundamentals
Title IRNSS Signal Plan
Author(s) J.A Ávila Rodríguez, University FAF Munich, Germany.
Level Advanced
Year of Publication 2011

In this article are described the signals corresponding to the Indian Regional Navigational Satellite System (IRNSS), which is a regional satellite navigation system owned by the Indian government. The system is being developed by Indian Space Research Organization (ISRO).

In April 2016, with the last launch of the constellation's satellite, IRNSS was renamed Navigation Indian Constellation (NAVIC) by India’s Prime Minister Narendra Modi.[1]

The messaging service signals from the Indian Regional Navigation Satellite System (IRNSS) are broadcast in L5 and S band frequencies. The carrier frequency and the bandwidth of transmission for the messaging service are:[2]

IRNSS Carrier Frequencies and bandwidths
Signal Carrier Frequency Bandwidth
L5 1176.45 MHz 24 MHz (1164.45 -1188.45 MHz)
S 2492.028 MHz 16.5 MHz (2483.778 - 2500.278 MHz)
L1 1575,42 MHz 24 MHz (1551,42 - 1599,42 MHz)

In the following figures are shown the L5 and S bands in the spectrum of Radio Navigation Satellite Services.

Figure 1: Spectrum for Radio Navigation Satellite Services in L Band.[2]
Figure 2: Spectrum for IRNSS Signal in S Band.[2]

Given the similarity with the Galileo signals in terms of services that IRNSS might be providing, the same convention as for Galileo was employed. That is A for the PRS and B and C for the Open Service data and pilot signals respectively.

Moreover, India also transmits similar signals for the S-band to those we have just described for the L5 band. The carrier frequency of S-band is at 2491.75 MHz. The modulation schemes and data rates are the same as for L5 (BPSK(1) and BOC(5,2)). In addition, India has started to transmit signals in L1 as it was announced during the second Meeting of the ICG in India, in 2007. Two L1 signals are also added on the last IRNSS satellites: one L1 MBOC and a BPSK(n) shifted from 18.414 MHz above L1. They are compatible with other L1, L5 and S GNSS Open signals. In addition, has introduced NeQuick-N model for Ionospheric delay modeling in L1-SPS signal, removing the need of having an additional SBAS channel only for Ionospheric corrections over Indian region for receiving the error correction values[3]


References

  1. ^ With IRNSS-1G launch, India completes and renames its navigation constellation
  2. ^ a b c IRNSS Signal-In-Space ICD v1.1
  3. ^ Update on NavIC Signal Monitoring Receiver and The Advantage of NavIC L1 SPS 2017, by Saumi S., Rohan S. Urdhwareshe, Saurabh Bhalla, Rakesh Kr. Bijarniya and Sagar Subudhi


Credits

The initial information presented in this NAVIPEDIA’s article was an extract of the PhD work performed by Dr. Jose Ángel Ávila Rodríguez in the FAF University of Munich as part of his Doctoral Thesis “On Generalized Signal Waveforms for Satellite Navigation” presented in June 2008, Munich (Germany)


This article has been updated by GMV considering the information stated in the latest IRNSS Signal Interface Specification.

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