Piksi : The RTK GPS Receiver by Swift Navigation Inc.

We’ve had a lot of interest in the Piksi RTK system from professionals in the GIS and mapping fields, but our RTK Kit alone was not enough to fulfill this need. To use Piksi in these settings, you need a durable, integrated solution - one that can be turned on with the flick of a switch, and is accompanied by an easy, intuitive user interface. So, we have added a new reward, a ruggedized version of our RTK Kit containing two Piksi receivers each fully assembled with an enclosure, a Bluetooth module, an SD card slot, an integrated radio link, and 10 hours of rechargeable Lithium Polymer batteries. We’ll also be releasing data collection apps for Android and iOS that interface with Piksi over Bluetooth; you’ll be able to take measurements, plot points on your smartphone’s map, and for professionals, export to common formats to integrate into your standard mapping workflow - all with the 4 centimeter accuracy of the Piksi RTK system. Some possible applications: Piksi Technical Specs:

RTKLIB on the Raspberry Pi I've got a workmate. He wants to build an autonomous, electric, rotary hoe. Anyway, he needs to locate the hoe to within a few centimetres. I'd been contemplating DGPS for a while as I've found GPS tracks are a bit wandery when logging tracks for OpenStreetMap. I thought it'd be a good capability to have, so I've stepped up to the task of tracking Robohoe. Background Information This is basically a link dump of what I've found so far: RTKLIB : DGPS software This is the bees knees for cheap arse DGPS. It's also got a number of other super handy programs, that do things like convert RTKLIB output into a Google Earth KML file, serve serial input out to multiple processes via Unix sockets etc. The RTKLIB manual is here. LEA-4T : GPS hardware The U-Blox 'T' series of modules (the LEA-4T, LEA-5T, and NEO-6T) produce data suitable for input to RTKLIB. The pinout for this module is (from here):antenna - SMB male connector 2 4 6 8 1 3 5 7 bottom EBay : USB serial unit Generic FTDI USB serial dongle.

Sensors GPS Module We often think that GPS modules are useful for map-tracking purposes only, but the GPS can be used to acquire much more important data: from brakes analysis to chassis info and, obviosly, driver's behaviour while on track. Thanks to the GPS module, you will be able to visualize track data with speed, position (including driver's errors) and visualize those information in Google Earth. All of your performances on the track viewed through real, stunning images. This is all you need to improve your driving skills and start tuning your car! The GPS module is connectable and perfectly compatible with other AIM products such MXL professional gauge or EVO 3 datalogger. Information you'll get thanks to GPS module: * Position * Speed * Cornering rate * Cornering in-line and lateral G * Lap times Download

An Introduction to GNSS | Chapter 4 - Real-Time Kinematic | NovAtel The positioning technique we described in Chapter 2 is referred to as code-based positioning, because the receiver correlates with and uses the pseudorandom codes transmitted by four or more satellites to determine the ranges to the satellites. From these ranges and knowing where the satellites are, the receiver can establish its position to within a few metres. For applications such as surveying, higher accuracies are required. Real-time kinematic techniques are complicated. At a very basic conceptual level, as shown in Figure 38, the range is calculated by determining the number of carrier cycles between the satellite and the rover station, then multiplying this number by the carrier wavelength. Figure 38 Real-Time Kinematic A complicated process called “ambiguity resolution” is needed to determine the number of whole cycles. Rovers determine their position using algorithms that incorporate ambiguity resolution and differential correction. Virtual Reference Stations (VRS)

Finding the right sensor for linear displacement | Sensors content from Machine Design Les Schaevitz Design-for-Application Product Manager Macro Sensors Div. Howard A. Schaevitz Technologies Inc. Pennsauken, N.J. Engineers continue to increase their use of linear-position and displacement sensors for providing real-time information to feedback-hungry PLCs and microcontrollers, which are taking over more control of linear-position/actuator-based systems. These devices, known as linear-position and displacement sensors, are proportionaloutput devices that continuously indicate position. Although most of the sensing technologies discussed here can be used in rotary and angular-position sensing, we will stick to linear applications, specifically those used in most industrial and commercial applications of 100min. to 100 in. (2.5mm to 2.5 m). Basic economic issues of price and nonrecurring expenses. OEMs buying sensors are heavily driven by economics. Resistive sensors or “pots" (short for potentiometer) are the best-known and most frequently used resistive sensors.

APM 3G Telemetry Autoland and motor stop of Multiwii quadcopter, altitude hold, GPS hold and return to home