AFPV SN-AAT User manual

SN-AAT
AAT - Auto Antenna Tracker.
SN-AAT uses an efficient video signal superposition algorithm,SN-L(Airborne
module) superimposes information such as GPS onto video,then transmits the
video to AAT through the video transmitter,completes information
encoding-transmission-decoding;AAT aligns the antenna with the aircraft in
real time based on the acquired aircraft position information,and outputs its
information according to mavlink protocol or screen output.

Features
Compact design,easy to use,easy to carry.
Standard video transmission channel.
Support MAVLINK protocol,real-time path display with GCS such as QGC.
Support compass and gyroscope.
Support GPS,dynamic positioning.
Automatically select and save the takeoff position.
Support OLED display.
Plug and play;Easyest connection with 2 wires only!
GPS and Bluetooth are optional ！

Precautions
1. Operating Voltage:2S-4S(7-16v).
2. Vedio Input:Must be connected during normal work.
3. GPS:Plug and play.
4. Compass:Try to avoid disturbing the compass.
Upgrade Wiring
Conditioning Moudle

KEY OPERATION
UP
Switch menu;Select menu;Hold for 3 seconds to release,switch offline/tracking mode.
DOWN
Switch menu;Select menu.
ENTER
Enter menu;Hold for 3 seconds to release,compass calibration.
BACK
Back to previous.
MENU
1.Parameter menu:includes two pages,switch by UP and DOWN.
2.Setting menu:as follows.
Item
Meaning
PORT
Port output mode
SERVO
Offline/Tracking
COMPASS
ON/OFF
DIR
AAT installation direction
CAL
Angle calibration
VOL
Voltage offset
YWA/PITCH1/2
Accurately adjust the angle range of servo
BIAS1/2
Adjust the servo offset
PORT MODE
MAVLINK:GCS such as QGroundControl can be connected via tools such as
Bluetooth,Achieve attitudes and real-time flight path display;One-way reception.
NONE:Not working.
*Need to restart AAT after changing the mode.
*The specific setting parameters in MAVLINK are baud rate 57600,no parity,1 stop bit.

SERVO AND BIAS
servo mode
1. Tracking：AAT real-time automatic control servo.
2. Offline：Keep the last moment;If the signal is lost or the AAT tilt angle is too
large,it will automatically enter offline mode.
*Please try to ensure that the device is stationary when powering up.
servo bais
1. bais1：Horizontal servo bais,1 degree at a time.
2. bais2：Vertical servo bais,1 degree at a time.
YWA/PITCH1/2
Accurately set the range of servo motion,avoid dead zones caused by a larger or smaller
range of motion angles than normal.
CALIBTATION
Compass calibration：
(1) Enter calibration:<KEY OPERATION>.
(2) Calibration step:vertical and horizontal for 3 turns.
(3) Verify calibration:enter the seting menu for angle calibration.If it is not accurate, there may
be magnetic field interference nearby,please check again.
(4) Gyroscope：try to ensure that the device is stationary when powering up,AAT starts working after
gyroscope calibration is completed.
Angle calibration:
(1) Enter calibration:<CAL>.
(2) Calibration step:
11st step:point north,pitch is 0 degrees.
22nd step:point east,pitch is 30 degrees.
33rd step:point south,pitch is 60 degrees.
44th step:point west,pitch is 90 degrees.
Calibration instructions:
If the compass is turned on during angle calibration, the above orientation refers to the geographical
orientation; otherwise, the front direction of the AAT is north.
INSTALLATION DIRECTION
*After changing the installation direction, you need to restart AAT and recalibrate the compass!
Compass Closed
Compass Open
FORWARD
Screen pointing to south
No need to care
BACKWARD
Screen pointing to north
No need to care

PRE-FLIGHT CHECK
FIRMWARE
Tools required for upgrading include software consistent with SN_L,use the upgrade wire that comes
with AAT.
CONDITIONING MOUDLE
Some cameras cause video to shake or flicker due to problems such as system and compatibility,in
turn, affecting signal recognition,This module can be used at this time.Use this method to connect the
module between the camera and the flight controller; or directly replace the camera.
FAQ
Q：The communication failed and there is no data.
A：Check if the wiring is correct;Check if the camera system is PAL；Try adjusting SN_L black level.
Q：Communication is normal but cannot be tracked.
A：Check if the servo is in tracking mode;When the AAT is connected to the GPS, check whether the AAT
is unlocked, after unlocking,the number of satellites stops flashing;Check if the SN meets the takeoff
conditions.
Q：Horizontal pointing is not accurate.
A：When the compass is not enabled,check the angle error by angle calibration;When the compass is enabled,
check if the calibration is correct and there is interference around.
Q：Vertical pointing is not accurate.
A：<CALIBRATION> -- <angle calibration>.
Q：AAT is not pointing correctly.
A：For ground testing,it is recommended that the horizontal distance is more than 20 meters and the height
is more than 5 meters;Because of the gyroscope,the AAT is kept as static as possible when power is on.
GPS connected
GPS not connected
FC positioned and AAT connected
normally can take off.
Place the aircraft near the AAT (within 3m) and take off
when the FC is positioned.