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Re: [Paparazzi-devel] Airframefile for a boat

From: Christophe De Wagter
Subject: Re: [Paparazzi-devel] Airframefile for a boat
Date: Sat, 7 Feb 2015 21:28:17 +0100

Although not specifically designed for this, it is absolutely possible to guide a boat with standard paparazzi fixedwing code.

If you set all altitude gains to zero, you end up with just the cruise throttle which you set as required (can be changed from the "flight"plan)

Depending on which board you use, you might want to disable the imu (e.g.), although if your boat does not roll too much it might not even matter a lot.

There is no option (yet) to disable attitude control by default, but if you only have a p-gain and no IMU, then the attitude loop will simply pass through the guidance commands.


On Fri, Feb 6, 2015 at 11:34 PM, Jorn Anke <address@hidden> wrote:
I want to try to have paparazzi (a Lisa/M) to control a RC-boat.

My idea is to modify a airframefile for a EZStar for the purpose, since the EZStar is originally controlled by throttle/rudder/elevator only.

The current airframefile is found below. I have tried to remove the settings related to roll and pitch control, but then the setup will not compile.

Any suggestions for how to get paparazzi to use a fixed throttle level set in a airframefile -or to use a throttle level set directly from the tx? (I am not even sure it is possible to make paparazzi "forget" everything about roll and pitch control).


<!DOCTYPE airframe SYSTEM "../airframe.dtd">

<!-- this is a boat! based on a EZStar
  * Autopilot:   Lisa/M 2.0
  * IMU:         Aspirin 2.1
  * GPS:         Ublox      
  * RC:          any PPM system
  * Modem        XBee in transparent mode at 57600 baud

<airframe name="my_lisa_m2_boat">

  <firmware name="fixedwing">
    <target name="ap"             board="lisa_m_2.0">
      <!-- higher frequency for aspirin imu, ouputs data at 100Hz -->
      <configure name="PERIODIC_FREQUENCY" value="120"/>
      <configure name="AHRS_PROPAGATE_FREQUENCY" value="100"/>
      <configure name="AHRS_CORRECT_FREQUENCY" value="100"/>
      <define name="AHRS_TRIGGERED_ATTITUDE_LOOP"/>

    <target name="sim"             board="pc"/>

    <define name="USE_MAGNETOMETER" value="FALSE"/>

    <subsystem name="radio_control" type="ppm"/>
    <subsystem name="telemetry" type="transparent"/>
    <subsystem name="control"/>
    <subsystem name="imu" type="aspirin_v2.1"/>
    <subsystem name="ahrs" type="float_dcm"/>
    <subsystem name="gps" type="ublox"/>
    <subsystem name="navigation"/>
    <subsystem name="ins" type="alt_float"/>

    <load name="nav_line.xml"/>

  <!-- commands section -->
    <servo name="THROTTLE"      no="7" min="1120" neutral="1120" max="1920"/>
    <servo name="ELEVATOR"      no="3" min="1100" neutral="1515" max="1900"/>
    <servo name="RUDDER"        no="4" min="950" neutral="1440" max="2050"/>

    <axis name="THROTTLE" failsafe_value="0"/>
    <axis name="ROLL"     failsafe_value="0"/>
    <axis name="PITCH"    failsafe_value="0"/>

    <set command="ROLL"      value="@ROLL"/>
    <set command="PITCH"     value="@PITCH"/>
    <set command="THROTTLE"  value="@THROTTLE"/>

    <set servo="THROTTLE"    value="@THROTTLE"/>
    <set servo="RUDDER"      value="@ROLL"/>
    <set servo="ELEVATOR"    value="@PITCH"/>

  <section name="AUTO1" prefix="AUTO1_">
    <define name="MAX_ROLL" value="50" unit="deg"/>
    <define name="MAX_PITCH" value="40" unit="deg"/>

  <section name="IMU" prefix="IMU_">
    <define name="BODY_TO_IMU_PHI"   value="0." unit="deg"/>
    <define name="BODY_TO_IMU_THETA" value="0." unit="deg"/>
    <define name="BODY_TO_IMU_PSI"   value="0." unit="deg"/>

  <section name="INS" prefix="INS_">
    <define name="ROLL_NEUTRAL_DEFAULT"  value="0" unit="deg"/>
    <define name="PITCH_NEUTRAL_DEFAULT" value="0" unit="deg"/>

  <section name="BAT">
    <define name="MILLIAMP_AT_FULL_THROTTLE" value="20000" unit="mA"/>
    <define name="CATASTROPHIC_BAT_LEVEL" value="9.0" unit="V"/>
    <define name="CRITIC_BAT_LEVEL" value="9.5" unit="V"/>
    <define name="LOW_BAT_LEVEL" value="10.0" unit="V"/>
    <define name="MAX_BAT_LEVEL" value="12.5" unit="V"/>

  <section name="MISC">
    <define name="NOMINAL_AIRSPEED" value="15." unit="m/s"/>
    <define name="CARROT" value="4." unit="s"/>
    <define name="KILL_MODE_DISTANCE" value="(2.0*MAX_DIST_FROM_HOME)"/>
    <define name="DEFAULT_CIRCLE_RADIUS" value="100."/>

  <section name="VERTICAL CONTROL" prefix="V_CTL_">
    <define name="POWER_CTL_BAT_NOMINAL" value="11.0" unit="volt"/>
    <!-- outer loop -->
    <define name="ALTITUDE_PGAIN" value="0.075" unit="(m/s)/m"/>
    <define name="ALTITUDE_MAX_CLIMB" value="4." unit="m/s"/>
    <!-- auto throttle inner loop -->
    <define name="AUTO_THROTTLE_NOMINAL_CRUISE_THROTTLE" value="0.5" unit="%"/>
    <define name="AUTO_THROTTLE_MIN_CRUISE_THROTTLE" value="0.2" unit="%"/>
    <define name="AUTO_THROTTLE_MAX_CRUISE_THROTTLE" value="1.0" unit="%"/>
    <define name="AUTO_THROTTLE_LOITER_TRIM" value="1500" unit="pprz_t"/>
    <define name="AUTO_THROTTLE_DASH_TRIM" value="-1000" unit="pprz_t"/>
    <define name="AUTO_THROTTLE_CLIMB_THROTTLE_INCREMENT" value="0.1" unit="%/(m/s)"/>
    <define name="AUTO_THROTTLE_PGAIN" value="0.02" unit="%/(m/s)"/>
    <define name="AUTO_THROTTLE_IGAIN" value="0.03"/>
    <define name="AUTO_THROTTLE_PITCH_OF_VZ_PGAIN" value="0.05" unit="rad/(m/s)"/>
    <define name="AUTO_PITCH_PGAIN" value="0.125"/>
    <define name="AUTO_PITCH_IGAIN" value="0.025"/>
    <define name="AUTO_PITCH_MAX_PITCH" value="25" unit="deg"/>
    <define name="AUTO_PITCH_MIN_PITCH" value="-25" unit="deg"/>
    <define name="THROTTLE_SLEW" value="1.0"/>

  <section name="HORIZONTAL CONTROL" prefix="H_CTL_">
    <define name="COURSE_PGAIN" value="1.0"/>
    <define name="COURSE_DGAIN" value="0.4"/>
    <define name="ROLL_MAX_SETPOINT" value="35" unit="deg"/>
    <define name="PITCH_MAX_SETPOINT" value="25" unit="deg"/>
    <define name="PITCH_MIN_SETPOINT" value="-25" unit="deg"/>
    <define name="PITCH_PGAIN" value="20000."/>
    <define name="PITCH_DGAIN" value="1.5"/>
    <define name="ELEVATOR_OF_ROLL" value="2500"/>
    <define name="ROLL_ATTITUDE_GAIN" value="7400"/>
    <define name="ROLL_RATE_GAIN" value="200"/>

  <section name="FAILSAFE" prefix="FAILSAFE_">
    <define name="DELAY_WITHOUT_GPS" value="3" unit="s"/>
    <define name="DEFAULT_THROTTLE" value="0.4" unit="%"/>
    <define name="DEFAULT_ROLL" value="15" unit="deg"/>
    <define name="DEFAULT_PITCH" value="0" unit="deg"/>
    <define name="HOME_RADIUS" value="90" unit="m"/>


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