No, we do not support sub-meter accuracy.

Acquisition sensitivity can be summarized in two  conditions: ephemeris available from any source, or ephemeris must be obtained from the satellite data stream. For conditions where ephemeris is available, we can acquire a satellite down to about -155 dBm. When we must decode … Continue reading “How do you summarize acquisition sensitivity ?”

For the ISM300x and ISM420 GPS, we output the 1 PPS as follows: The first output starts when we the GPS Kalman filter gets a stellite fix.  Thereafter, the 1 PPS continues to  be output until the receiver is reset.  If we … Continue reading “How does your GPS output the 1 PPS?”

Yes, the ISM300x and the ISM480x family of GPS can be flashed in system. You need to control the flash enable pin and you can upgrade teh flash through the UART.

The high-altitude change was simply setting the upper limits on a solution from the Kalman filter. It had no effect on how we report altitude or speed or how we handle acceleration.  Therefore, with such a build we still make … Continue reading “What does the GPS firmware do with the acceleration / speed at high altitude build for us to 135k feet?”

The newest GPS technology we have today is the SiRF IV GPS modules and we offer two products, the ISM420 and the ISM480. The ISM420 is a ROM based solution with no antenna attached, while the ISM480 is a Flash … Continue reading “How do I choice the best GPS for my application?”