# Finding C/N0

**URL:** <https://learn.safran-navigation-timing.com/t/finding-c-n0/827>\
**Category:** Skydel Discussion\
**Created:** [August 31, 2022, 11:00am UTC](https://learn.safran-navigation-timing.com/t/finding-c-n0/827 "2022-08-31T11:00:46Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![mohdyaser](https://yyz2.discourse-cdn.com/flex030/user_avatar/learn.safran-navigation-timing.com/mohdyaser/32/422_2.png) [@mohdyaser](https://learn.safran-navigation-timing.com/u/mohdyaser)\
**Post date:** [August 31, 2022, 11:00am UTC](https://learn.safran-navigation-timing.com/t/finding-c-n0/827/1 "2022-08-31T11:00:46Z")

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Does Skydel calculate the C/N0 directly? if not, does it help me to calculate it (estimate losses, gains, powers. etc.)?

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**Author:** ![Grace](https://avatars.discourse-cdn.com/v4/letter/g/f17d59/32.png) [@Grace](https://learn.safran-navigation-timing.com/u/Grace)\
**Post date:** [August 31, 2022, 4:00pm UTC](https://learn.safran-navigation-timing.com/t/finding-c-n0/827/2 "2022-08-31T16:00:25Z")

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Hi @mohdyaser,

The “reference power” for all GNSS signals generated by Skydel is around -130dBm. A slider set to “0 dB” will force the signal to be at -130dBm:

 ![2022-08-18 13_32_51-CN0_test_1.docx - Dernier enregistrement par l’utilisateur - Word](https://canada1.discourse-cdn.com/flex030/uploads/orolia/original/1X/af964e02d41a9405a5fdcfcf54352e77cfa4673a.png)

When Gaussian Noise is activated, Skydel generates noise such the ratio between a simulated GNSS signal at -130dBm and the thermal background noise will be C/NO = 44 dB\*Hz.

When generating RF signals with Skydel connected to an SDR radio, the measured signal strength will be dependent on:

- Your Skydel configuration settings
- The radio gain
- The losses of RF equipment
- Etc.

In this case, you will need to perform a manual CN0 measurement.

Regards

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<div class="post-metadata">

**Author:** ![A-D](https://avatars.discourse-cdn.com/v4/letter/a/50afbb/32.png) [@A-D](https://learn.safran-navigation-timing.com/u/A-D)\
**Post date:** [November 8, 2022, 1:55pm UTC](https://learn.safran-navigation-timing.com/t/finding-c-n0/827/3 "2022-11-08T13:55:17Z")

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In addition, we have recently published a related tutorial you may find helpful.

**[Tutorial: Measuring a GNSS Signal and Gaussian Noise Power](https://learn.safran-navigation-timing.com/t/tutorial-measuring-a-gnss-signal-and-gaussian-noise-power/918)**

AD