Get sub-metric accuracy from an iPad / iPhone

The GPS receiver of an iOS device, such as iPad or iPhone, gets precisions in the order of any other browser: between 2 and 3 meters. Apart from GIS Kit, Few other possibilities we had seen to improve its accuracy, however thanks to the consultation of a friend, it seems interesting to give a look at this toy that, unlike the Posify This is integrated with mobile devices.

Gps ipadAlthough it looks like a simple device, the Bad Elf GNSS Surveyor is a new and powerful receiver that via Bluetooth gives a mobile device the option to become a GNSS receiver, including a barometric sensor to get the altitude above sea level. On the fly it operates as a navigator, but in static mode, it can achieve sub-metric accuracies using SBASS, with differential post-processing support (DGPS) reaching values ​​between 10 and 50 centimeters.

It can even be used with 5 devices at the same time via Bluetoot.

For the price it has, it is really tempting, since it seems an interesting alternative for lifting with acceptable precisions at a low cost.

Precision offers the Bad Elf GNSS Surveyor

  • Precise Point Positioning (PPP): For static applications with good visibility. PPP uses carrier phase signal to reduce ionospheric distortions and multi-path signals. This provides accuracies of one meter without having to refer to local stations or other sources of correction.
  • Space Based Augmentation Services (SBAS): Through a constellation of satellites, SBAS provides data corrections for orbit, clock and delays due to weather conditions or ground reference stations. The coverage includes North America (WAAS), Japan (MSAS), Europe (EGNOS) and India (GAGAN). SBAS by itself includes horizontal position with accuracies of 2 to 2.5 meters.
  • GPS Differential Correction (D-GPS): Correction is available through base stations anywhere in the world, the GNSS environment supports the RTCM 2.3 industry standard for operation as a D-GPS rover.
  • Raw data post processing for RTK: For applications where better accuracy is required (from 10 to 50 centimeters), raw data and SBAS measurements are available for real-time (RTK) and post-process kinematic applications. This data is available through the SDK and log files saved in standalone mode.

The Bad Elf GNSS Surveyor can also provide GPS data in NMEA streaming mode via Bluetooth or USB for non-iOS devices, such as mobiles running on Android, Windows, Mac OS X or Linux. Although for now the support for these platforms is limited.

The following graph shows how in a measurement at the beginning a statistic of points near the three meters is obtained, descending to two meters, very acceptable submetric measurement before the four minutes.

Gps precision

GPS Characteristics Bad Elf GNSS Surveyor.

  • Accuracy GNSS less than one meter stationary, sweating SBASS + PPP.
  • 10 to 50 cm precision using a post-processing application. In the future they promise SDK for third-party development.
  • Supports differential postprocessing (DGPS), using RTCM correction from a network of local reference stations.
  • Reception of 56 GPS, GLONASS and QZSS channels with SBASS (WAAS / EGNOS / MSAS)
  • On the move it provides GPS precision of 2.5 meters.
  • Sample rate configurable at 10 Hz.
  • Mode visible status, GPS + GLONASS on bright LCD screen.
  • Battery life up to 35 hours. Although it supports 200 hours in non-receive mode.
  • It can be viewed from the PC via USB cable, it looks like a pen drive.
  • Option to connect in stream mode to PC or Mac.
  • Includes barometer for altitude.
  • Hot ignition as fast as a second, with reception of satellites without dependence on telephony tower. (It does not require internet for GPS access).
  • It can be used up to 18,000 meters maximum, in case of air navigation, and speed up to 1,600 kilometers per hour.

The device works by itself, improving reception accuracy with almost any iOS application, but requires integration using the Bad Elf SDK to access advanced features. For now its manufacturers have begun to work seriously with many application developers with GNSS support.

When buying the device comes included:

  • BE-GPS-3300 GNSS capture device.

  • 90cm USB cable for power charging.
  • Vehicle charger 12-24 volts.

  • Detachable Neck Lanyard.

It is compatible with iPod, iPad and iPhone devices:

  • IPod touch fifth generation.

  • IPhone 5S, 5C, 5, 4S, iPhone 4, iPhone 3GS, and iPhone 3G.
  • IPad Air, iPad (Third and fourth), iPad 2, iPad.
  • IPad mini with Retina display, iPad mini.

The promotion price is at 499 dollars.

Not bad, compared to an equivalent team of well-known brands walks above the 1,900 dollars - or more. From the best I've seen in economical solutions for precision surveys, but you have to test it to make sure it makes sense in a bulk purchase for a large project.

Here you can see more information.

3 Replies to "Get submetric accuracy from an iPad / iPhone"

  1. Jag är i stort behov av instruktioner hur Bad Elf GPS pro fungerar hur jag skall ställa in den för att få den att funka så noggrant som möjligt
    Vänliga hälsningar Dan Ericson

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