Editing Raspberry Pi NTP Server (section)

=== Configurare gpsd ===
Instalam pachetele necesare pentru gestionarea modulului GPS:
* apt install gpsd gpsd-clients

==== Startup config pentru gpsd ====
Editam fisierul de configurare gpsd:

<code class="mw-code mw-highlight plainlinks" style="display:block"><!--
-->&#32;<b># nano /etc/default/gpsd</b>
&#32;
&#32;START_DAEMON="true"
&#32;DEVICES="/dev/serial0 /dev/pps"
&#32;GPSD_OPTIONS="-n"
&#32;USBAUTO="false"
&#32;GPSD_SOCKET="/var/run/gpsd.sock"
</code>

* START_DAEMON -> Porneste automat serviciul gpsd la boot. Daca este "false", gpsd nu se lanseaza singur.
* DEVICES -> Aceasta linie indica gpsd sa deschida doua dispozitive simultan
** /dev/serial0 → fluxul NMEA provenit de pe UART (datele GPS clasice: GGA, RMC, sateliti etc.)
** /dev/pps → semnalul PPS hardware folosit pentru sincronizare precisa la nivel de secunda
* GPSD_OPTIONS -> Porneste gpsd chiar daca nu exista clienti conectati. Fara "-n", gpsd asteapta un client inainte sa initializeze modulul GPS.
* USBAUTO -> Dezactiveaza detectarea automata a dispozitivelor GPS USB; necesar cand folosim un modul pe UART.
* GPSD_SOCKET -> Definește socket-ul UNIX prin care aplicatiile (cgps, chrony etc.) comunica cu gpsd.

Repornim serviciul executand:
* service gpsd restart

==== Testare gpsd ====
Testam functionarea modulului GPS:

<code class="mw-code mw-highlight plainlinks" style="display:block"><!--
-->&#32;<b># cgps -s</b>
&#32;lqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqklqqqqqqqqqqqqqqqqSeen 21/Used 14qqk
&#32;x Time         2026-02-25T14:06:01.000Z (18)xxGNSS  S PRN  Elev  Azim   SNR Usex
&#32;x Latitude          44.43550340 N           xxGP 10    10  28.0 182.0  43.0  Y x
&#32;x Longitude         26.10252040 E           xxGP 15    15  16.0  80.0  46.0  Y x
&#32;x Alt (HAE, MSL)     128.736,     93.872  m xxGP 18    18  67.0  45.0  32.0  Y x
&#32;x Speed              0.02              km/h xxGP 23    23  57.0 144.0  37.0  Y x
&#32;x Track (true, var)     166.0,   5.8    deg xxGP 26    26  52.0 222.0  23.0  Y x
&#32;x Climb              1.92             m/min xxGP 27    27  30.0 299.0  27.0  Y x
&#32;x Status          3D DGPS FIX (9 secs)      xxGP 29    29  22.0 105.0  38.0  Y x
&#32;x Long Err  (XDOP, EPX)   0.56, +/-  2.2 m  xxSB127    40  31.0 142.0  35.0  Y x
&#32;x Lat Err   (YDOP, EPY)   0.64, +/-  2.4 m  xxSB128    41  15.0 114.0  31.0  Y x
&#32;x Alt Err   (VDOP, EPV)   1.28, +/-  4.5 m  xxGA  2   302  65.0 200.0  36.0  Y x
&#32;x 2D Err    (HDOP, CEP)   0.85, +/-  3.4 m  xxGA 25   325  19.0 157.0  34.0  Y x
&#32;x 3D Err    (PDOP, SEP)   1.54, +/-  7.4 m  xxGA 30   330  44.0 304.0  22.0  Y x
&#32;x Time Err  (TDOP)        0.90              xxGA 34   334  49.0 242.0  25.0  Y x
&#32;x Geo Err   (GDOP)        1.79              xxGA 36   336  74.0  38.0  29.0  Y x
&#32;x Speed Err (EPS)            +/- 17.5 km/h  xxGP  5     5   5.0  34.0   0.0  N x
&#32;x Track Err (EPD)         n/a               xxGP 16    16  55.0 285.0   0.0  N x
&#32;x Time offset                    -2113301 s xxGP 20    20   9.0  57.0  25.0 uN x
&#32;x Grid Square             KN34bj13          xxSB123    36  39.0 184.0  40.0  N x
&#32;x ECEF X, VX    4099907.290  m    0.020  m/sxxSB126    39  27.0 132.0   0.0  N x
&#32;x ECEF Y, VY    2008197.370  m    0.010  m/sxxSB136    49  35.0 209.0   0.0  N x
&#32;x ECEF Z, VZ    4439297.500  m    0.020  m/sxxGA  6   306   4.0  81.0  37.0  N x
&#32;mqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqjmqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqj
</code>

Din coloana situata in partea dreapta observam ca sistemul nostru se conecteaza la:
* GP - GPS (Global Positioning System) este un sistem global de navigatie prin satelit dezvoltat de Statele Unite.
* GA - Galileo este sistemul european de navigatie prin satelit (GNSS), dezvoltat de Uniunea Europeana.
* SB - SBAS (Satellite-Based Augmentation System) este un sistem care imbunatateste precizia si fiabilitatea pozitionarii GNSS (GPS, Galileo etc.)
Alte sisteme de GNSS care nu sunt prezente in conexiunea nostra ar pute fi:
* GL - GLONASS este sistemul de navigatie prin satelit al Federatiei Ruse
* BD - BeiDou este sistemul de navigatie prin satelit al Chinei