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Questions tagged [gps]

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Upsampling realtime data for sensor fusion

I am doing a real-time sensor fusion of gps and imu streams using a Kalman filter. Both streams are obtained independently (with geolocation and accl-gyro values) in real time. I am doing this in ...
fasith's user avatar
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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
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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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Wiener Filter for Noise Reduction in GPS Sensor Measurement

I am getting position and velocity measurements out of a GPS sensor and I want to filter these data, so I can have a better, less noisy, estimation of the true measurements. I thought of doing this ...
useeeeer132's user avatar
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MAX2769 I & Q For Signal Acquisition & Tracking

Having pulled data from a MAX2769B in device state 2 (2-bit I only), I have found satellite signals by multiplying the I-only data by the respective PRN and taking the FFT of the data. Using this ...
KyleG's user avatar
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Interpretation of a non-canonical Allan Variance plot

I am currently working on characterizing the noise sources of a Global Navigation Satellite System (GNSS) sensor using an Allan Variance plot, which is commonly employed to analyze frequency stability ...
RoninAmibo'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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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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Downsampling a binary file

TEXBAT is a recorded dataset about spoofing scenarios for evaluating GPS signal authentication techniques. On this project, there are recorded GPS signals stored as complex 16- bit samples at a rate ...
Aldrich Taylor's user avatar
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What are the differences between GPS and GLONASS?

I'm studying the localization systems, especially the GPS one. I inquired about other systems and wanted to understand what are the main differences between GPS and GLONASS, why has the first type ...
Riccardo Barbo's user avatar
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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.
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HackRF setup for capturing GNSS signals

I have a MATLAB script which process IF signals to acquire GPS satellites. I decided to capture IF signals containing GPS L1 C/A (1575.42 MHz) myself. What I have: HackRF TCXO for HackRF Active GPS ...
Faruk UNAL's user avatar
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569 views

Ground based GPS?

Most notable world powers are developing anti-satellite weapons and I could see a scenario where a significant number of the GPS satellites get knocked out. I'm wondering if there are ground based ...
FourierFlux's user avatar