Marilynpen wrote:The Islamic State group may be losing much of its territory in Iraq, but it has reportedly continued to stock up on weapons of war despite the other setbacks. The global terror group more commonly known as ISIS can "threaten aircraft" now, according to a tweet from a CBS News foreign correspondent. The tweet cited an unnamed "US military spokesman" as the source of the information.
The extent of the new disclosure was not immediately clear since it has long been reported — but not proven — that ISIS had the ability to shoot down aircraft. In the summer of 2015, ISIS released photos of its fighters firing off surface-to-air missiles near Israel's border in Egypt, the Daily Beast reported at the time. Still, there has not been a reported instance of ISIS actually shooting down a plane, be it a jet or low-flying aircraft.
ISIS has, however, been using of drones that have bombs affixed to them recently, the Washington Post reported Wednesday. The "Unmanned Aircraft of the Mujahideen" is what ISIS named its "fleet" of such drones that it said hit at least 39 Iraqi soldiers in one week, though it was not clear when those alleged attacks were supposed to have taken place.
While potentially stronger anti-aircraft weapons in the hands of ISIS were likely worrying to the efforts to fight the Islamic State, Iraqi security forces were being vigilant when it came to the drones, which have proven to be very destructive.
"A car bomb can destroy a unit," Iraq police commander General Ali al Lami told CBS News recently of the damage a bomb-equipped drone can create. "A truck bomb can destroy a brigade."
Some of the other ISIS weapons are equally, if not more formidable than the drones and apparent equipment that can "threaten aircraft," according to Business Insider. They include but were not limited to Soviet era tanks and armored vehicles; Humvees; AK-47 machine guns; lightweight anti-tank rifles; rocket launchers; grenade launchers; shoulder-launched anti-tank weapons; and anti-aircraft guns.
While the latter can hit flying targets up to two miles away, the new report from CBS news likely refers to weaponry that can hit "aircraft" flying much farther away.
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Many of the latest drones have dual Global Navigational Satellite Systems (GNSS) such as GPS and GLONASS. Drones can fly in both GNSS and non satellite modes. For example DJI drones can fly in P-Mode (GPS & GLONASS) or ATTI mode which doesn’t uses satellite navigation.
Highly accurate drone navigation is very important when flying and in drone applications such as to build 3D maps, surving landscape and SAR (Search & Rescue) missions.
When the quadcopter is first switched on, it searches and detects GNSS satellites. High end GNSS systems use Satellite Constellation technology. Basically, a satellite constellation is a group of satellites working together giving coordinated coverage and synchronized so that they overlap well in coverage. Pass or coverage is the period in which a satellite is visible above the local horizon.
The radar technology in the drone will signal the following on the remote controller display;
signal that enough drone GNSS satellites have been detected and the drone is ready to fly
display the current position and location of the drone in relation to the pilot
record the home point for ‘Return To Home’ safety feature
Most of the latest drone have 3 types of Return to Home drone technology as follows;
Pilot initiated return to home by pressing button on Remote Controller or in an app.
Low battery level where the UAV will fly back automatically back to home point.
Loss of transmission between the UAV and Remote Controller with the UAV flying back automatically to its home point.
The latest Mavic Air RTH feature can sense and actively attempts to avoid obstacles during automatic return to home. The Mavic Air RTH obstacle avoidance works as follows if the lighting is sufficient;
The Mavic Air slows down when an obstacle is sensed
It will stop and hover, then fly backward and ascends upwards until no obstacle is sensed.
Next the RTH process resumes and the Mavic Air will return to home point a the new altitude.
Obstacle Detection And Collision Avoidance Technology
Many drones are now equipped with collision avoidance systems. These drone vision systems use obstacle detection sensors to scan the surroundings, while software algorithms and SLAM technology produce the images into 3D maps allowing the flight controller to sense and avoid the object. These systems are fusing one of more of the following sensors to sense and avoid obstacles;
Time of Flight (ToF)
The latest DJI Mavic 2 Pro and Mavic 2 Zoom have obstacle sensing on all 6 sides. The Mavic 2 uses both Vision and Infrared sensors fused into a vision system known as Omnidirectional Obstacle Sensing.
The DJI Mavic 2 obstacle sensing system goes to the next level where it can actually fly around obstacles in front or when flying backwards. If it is unable to work out a flight path around the object, it will then hover in front of the obstacle. This is known as APAS (Advanced Pilot Assistance System) on the DJI Mavic 2 and Mavic Air drones.