Hx11 is our third generation ultrasonic positioning system, preceded by hx900 and hx5. It needs no wires to operate and no radio. Feed the HX11 devices with power, and it will send via the serial port the distances to all other HX11X devices in range. It can also emulate the HX5 doing what HX5 does at higher speeds.
HX11 Ultrasonic Positioning
System Tracking and Guidance
Tracking refers to a situation where a central
an example a computer, monitors the position of objects or moving objects
relative to fixed points. When tracking, the moving objects may not be aware
of their own position. Guidance refers to a situation where moving objects
(autonomous) calculate their positions relative to other objects in known
positions. The Hx11 does both.
Aim one hx11x device towards another and
it will output the identification and distance to that other device. Aim a
hx11x towards multiple other hx11x devices, and it will output the identity and
distance to all the other devices. Simply, every hx11x registers the distance
to all other hx11x devices in range.
Small System Example
Each HX11 device can be connected privately and directly to a serial port of a Microcontroller, PC, palmtop or a PDA as shown below. The PDA shown, knows the distances A to C, A to D and A to E. Knowing the fixed positions of C, D and E the PDA can calculate itís 3D position. Similarly, the laptop will possess the distances B to C, B to D and B to E for the triangulation of itís 3D position. C, D and E are free standing, they don't need to be connected together. Supplying the freestanding units with power is however necessary.
Medium System Example
If one more transponder F was added to the System Application Example 1 and a Network controller, then programs like xyz could be used by the desktop to triangulate the positions of A and B. Every 3D position is known to each device within a small fraction of a second.
The HX11 components can be connected to a network of devices utilizing FCC RJ11 style port. The RJ12 or RJ11 socket can be found on most domestic telephones, it is the socket which connects the telephone to the wall fixture. HX11 components have one or two RJ11 sockets. The communications and power to the HX11 is supplied on the network through the RJ12 port. It is eventually up to the user to use local, mobile or network power. Hx11 components have RS485 transceivers used for large networks, of several thousand hx11 devices communicating over long distance covering tens of kilometers.
Hx11 is our third generation ultrasonic positioning system, preceded by hx900 and hx5. Hx11 does all hx5 can do, with significantly higher speed. While it tracks like the hx5, it simultaneously serves as a system of transponders. This enables the HX11 to track and guide simultaneously. In the illustration below, each individual Hx11 element possesses the distance to every other element. These distances are transmitted through the serial port of each device. A computer connected to any one of these units will know the distance from it to all the other units. The devices can be set up on a network, controlled by a central computer. If a single computer was connected to [M1], [M2] and [M2] it will be able to triangulate the relative position of [t] (see image below). If [t] is connected to a mobile unit (lap or palm top), the mobile unit will be able to triangulate the coordinates of [t] knowing the position of [M1], [M2] and [M3].
The illustration below shows how the monitors can be configured in the XY plane, these can be mounted similarly on an office ceiling.
The illustration below suggests how a large area can be covered using hx11 devices. Any formation can be chosen, but an overhead honeycomb formation will provide one of the best coverage per unit cost. In the following the distances between monitors are everywhere the same 1 to 2 meters. The units form 60-degree triangles. Depending on the density of the network, many monitors may pick up signals from the same tag. The higher then number of monitors that detect the tag, the more accurate and stable will be the positioning.
Copyright © 1999 [Hexamite]. All rights reserved. Revised: December 16, 2016 .