====== pNav Versions Comparison ======

===== Cold Start ===== 

**Ideal Conditions** [(The antenna is pointed towards the zenith; the satellite is attitude-controlled and stable, with a perfect view of the sky.)]

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**pNav** could start takes app. 60 seconds. and is app. 10% faster than pNav2. 

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**pNav2** is app. 10% slower than pNav. Cold start s takes app. 70 seconds.
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**Real Conditions**[(At least one condition of Ideal Conditions is not satisfied.)]

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**pNav** cold start is problematic and can take up to hours. Acquisition is not guaranteed.

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**pNav2** cold start is reliable and takes at most a couple of minutes; see the Navigation of Rotating Satellite in the datasheet.
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===== Reaqusition =====

**Position fix exists**

Fast using Almanach data for both pNav and pNav2.

**No position fix**

Same problem as Real Conditions Acquisition. 

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pNav is very slow. Reacquisition is not guaranteed. 

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**pNav2** reacquisition is reliable and takes at most a couple of minutes; see the "Navigation of Rotating Satellite" in the datasheet.
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===== Tracking Sensitivity =====

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**pNav** can track only open sky satellites. 
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The tracking loops of **pNav2** were optimized to track weak signals; see the "Navigation of Rotating Satellite" in the datasheet.
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===== Antenna =====

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3.3V feeding. No feeding current limiter.

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2.85V feeding. Feeding current limiter.
Power supply 2.85 V. Supply current limiter. For optimal noise and intermodulation suppression, we recommend an active antenna with a wide beam and LNA gain of maximum 10 dB.  

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