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-========================================================================
-UHD - Internal GPSDO Application Notes (USRP-B2x0 Models)
-========================================================================
-
-.. contents:: Table of Contents
-
-This application note describes the use of integrated GPS-disciplined
-oscillators with Ettus Research USRP devices.
-
-------------------------------------------------------------------------
-Specifications
-------------------------------------------------------------------------
-* **Receiver type**: 50 channel with WAAS, EGNOS, MSAS
-* **10MHz ADEV**: 5e-11 over >24h
-* **1PPS RMS jitter**: <50ns 1-sigma
-* **Holdover**: <20us over 3h
-
-**Phase noise**:
-
-+------------+-------------+
-|            |     TCXO    |
-+============+=============+
-| **1Hz**    | -65dBc/Hz   |
-+------------+-------------+
-| **10Hz**   |  -102dBc/Hz |
-+------------+-------------+
-| **100Hz**  | -132dBc/Hz  |
-+------------+-------------+
-| **1kHz**   | -148dBc/Hz  |
-+------------+-------------+
-| **10kHz**  | -152dBc/Hz  |
-+------------+-------------+
-| **100kHz** | <-155dBc/Hz |
-+------------+-------------+
-
-**Antenna Types:**
-
-The GPSDO is capable of supplying a 3V for active GPS antennas or supporting passive antennas.
-
-------------------------------------------------------------------------
-Installation Instructions
-------------------------------------------------------------------------
-To install the GPSDO, you must insert it into the slot on the board
-near the 10 MHz Reference SMA. Keep in mind that the two sides of the
-GPSDO have a different number of pins. When inserting the GPSDO, make
-sure to press down firmly and evenly. When turning on the USRP B2X0 device,
-a green LED should illuminate on the GPSDO. This signifies that the unit
-has successfully been placed.
-
-**NOTE: The pins on the GPSDO are very fragile. Be sure to press down
-evenly, or the pins may bend or break. Once the GPSDO is in place,
-we very highly discourage further removal, as this also risks damaging
-the pins.**
-
-------------------------------------------------------------------------
-Using the GPSDO in Your Application
-------------------------------------------------------------------------
-By default, if a GPSDO is detected at startup, the USRP will be configured
-to use it as a frequency and time reference. The internal VITA timestamp
-will be initialized to the GPS time, and the internal oscillator will be
-phase-locked to the 10MHz GPSDO reference. If the GPSDO is not locked to
-satellites, the VITA time will not be initialized.
-
-GPS data is obtained through the **mboard_sensors** interface. To retrieve
-the current GPS time, use the **gps_time** sensor:
-
-::
-
-    usrp->get_mboard_sensor("gps_time");
-
-The returned value will be the current epoch time, in seconds since
-January 1, 1970. This value is readily converted into human-readable
-format using the **time.h** library in C, **boost::posix_time** in C++, etc.
-
-Other information can be fetched as well. You can query the lock status
-with the **gps_locked** sensor, as well as obtain raw NMEA sentences using
-the **gps_gprmc**, and **gps_gpgga** sensors. Location
-information can be parsed out of the **gps_gpgga** sensor by using **gpsd** or
-another NMEA parser.