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Cross Correlation Peak Value of Wideband signals - The Phase and Sample Offset are related but how

Two CDMA Codes or Gold Codes or PRN Sequencies, i.e. a pattern in time, are cross correlated in the time domain. However one of them is delayed compared to the other. How is the phase argument of the ...
njk7's user avatar
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1 answer
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Need help understanding FFT for timeseries analysis?

I am studying the seismo-ionospheric anomalies associated with the Japan earthquake using total electron content derived from a GPS signal. I am trying to detect acoustic-gravity waves in the signal ...
Imtiaz Nabi's user avatar
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What exactly is the carrier phase in a RINEX file?

RINEX files are containers for preprocessed data in GNSS receivers. I want to know what exactly the 'carrier phase' means. As far as I can tell, the carrier phase is simply the phase (that is, a value ...
requiemman's user avatar
1 vote
1 answer
61 views

Extracting raw gps messages with GNSS

I am using GNSS to see the position of the satellite that is sending the gps messages. When using GNSS, the decoder only gives me the coordinates for the receiver at the given time. What I want is to ...
Max Sundström's user avatar
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GNSS : How to analyze and correct the impact of Doppler rate on Acquisition CAF?

Taking GPS L1C/A cold(initial) acquisition as an example. If there is a doppler rate(Hz/sec) on the received signal and GNSS receiver has performed a mixture of coherent and non-coherent integration ...
DSP Rookie's user avatar
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1 answer
57 views

GNSS Acquisition in time domain: Why is conjugate of FFT replica used for the mixer?

Pretty new on all this GNSS stuff, I'm just studying from scratch an acquisition unit based in time domain using a parallel FFT structure. Just like the image got from "Acquisition Strategies of ...
ferdepe's user avatar
  • 103
2 votes
0 answers
106 views

GPS measured codephase error correction due to acceleration

If GPS L1C/A receiver is experiencing a Doppler shift of $f_D$ and a Doppler rate of $\alpha_D$, assuming total integration duration of $T_{int}$, then how should I calculate the code phase estimate ...
DSP Rookie's user avatar
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3 votes
1 answer
79 views

Efficient frequency domain search for reduced number of hypotheses

In CDMA signals (such as GNSS) there are two unknown parameters when one receives the signal, residual carrier frequency and an unknown delay. Assuming the carrier frequency residual is known, what is ...
ban09's user avatar
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1 answer
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GNSS : Code Phase and Carrier Phase Relation

What is the relation between code phase and carrier phase in a GNSS system (GPS L1CA, GPS L5 etc)? Any document or section of any book explaining the same will also do.
DSP Rookie's user avatar
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