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Quadcopter Loiter Test using PX1122R


Quadcopter loiter testing using ArduCopter + Pixhawk + PX1122R RTK EVB. 

It took us a long time to decide on a suitable small-size multi-band multi-GNSS antenna. We are expecting to have the antenna available in latter half of April. Below is the actual stacked ceramic patch antenna assembly inside the plastic housing enclosure.

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Multi-Band Multi-GNSS RTK

We are excited to launch NS-HP-GN2 multi-band RTK receiver product. NS-HP-GN2 is GPS L1/L2C, GLONASS L1/L2, Beidou B1I/B2I, Galileo E1/E5b capable. Key difference from NS-HP-GN single frequency RTK receiver are:1. The NS-HP-GN2 hardware is GPS / Beidou / Galileo / GLONASS quad-constellation capable, while NS-HP-GN is GPS / Beidou or GPS / GLONASS dual-constellation capable. With more signals to work with, NS-HP-GN2 will have [...]

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Cycle Slip Count in GNSS Viewer Update

Latest GNSS Viewer 20170712 version has Cycle Slip Count added. It relates to signal quality seen by the receiver, showing how many satellite signals has cycle slip detected when in Float RTK and Fix RTK state. Two cycle slip numbers are shown, left for the rover, right for the base. Below video shows low cycle slip [...]

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New Milestone in Low Cost Single Frequency RTK Performance

Single frequency RTK receivers work well under open sky environment. But when tall buildings or trees are encountered, none has yet shown to work well, they lose RTK Fix and have position jumps. This $595 Multi-Band, Multi-Constellation RTK GNSS Receiver struggles too when near trees.Below video shows our soon to be released firmware update that could [...]

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What's "-S" Version RTK For ?

-S version having RTK position stamp feature is mainly for UAV mapping application. It takes external positive edge camera trigger signal occurring on the TRIG pin and compute RTK position within closest internal 1msec tic and output in STI,005 message. For 50Km/hr flying UAV, max position error is 50e5/3600/1000 = 1.39cm on top of 1cm [...]

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NS-HP-GL RTK Performance

Below shows test result of NS-HP-GL GPS/GLONASS RTK receiver.Short Baseline 15 Hour Testing Accuracy: CEP 50% 0.33cm, R95 0.69cm, SEP 50% 0.63cm.Short Baseline Recycle Power Time to RTK Fix Testing, 75 TrialsAverage time to RTK Fix 23 sec.Longer Baseline Time to RTK Fix Testing, 5 Trials Each.11Km Baseline Drive Test Using Survey Grade HX-CSX601A Antenna and Tallysman TW2710 [...]

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What's Moving Base RTK For?

GPS receiver output correct course over ground (COG) information when in motion. It represent movement direction. Without movement, the output COG information may be incorrect.Some applications, such as marine vessel autopilot, require knowledge of accurate heading direction regardless of movement direction.  Two NS-HP or NS-HP-GL configured in moving base RTK mode gives precise heading in the direction [...]

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 NS-HP or NS-HP-GL are single frequency RTK receivers. For reliable consistent single-frequency RTK operation, they require 12 or more usable satellite signals above 15 degree elevation angle with SNR no less than 38dB/Hz. With 10 or 11 usable satellite signals, we've seen less than 0.1% rate of getting incorrect RTK Fix off by centimeters ~ decimeters. [...]

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