Tag: GPS
What application do you have to help troubleshoot the GPS design?
Ideally, if you can connect your PC to the UART for any of the ISM300x or ISM400x GPS modules you can run the Sirf Live. Sirf Live will show you all the satellites and C/no and allow you to send commands and … Continue reading “What application do you have to help troubleshoot the GPS design?”
Are your GPS modules ROHS?
Yes, all our modules are ROHS compliant.
Does the Sirf IV GPS modules have FCC/CE?
The FCC does not require that the GPS receiver has FCC or CE. We did perform FCC on the Sirf III for a specific customer request, however it is not required.
Does the ISM300x store Ephemeris data automatically?
Yes, if you use the battery back up feature and keep power alive the unit will store the data and provide warm starts. The ISM400x GPS do not require the battery back up.
Does your GPS support sub meter accuracy?
No, we do not support sub-meter accuracy.
How do you summarize acquisition sensitivity?
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?”
How does your GPS output the 1 PPS?
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?”
Can the GPS be flashed in System?
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.
What information is available to indicate the degree of accuracy of the GPS data at any given time?
What information is available to indicate the degree of accuracy of the GPS data at any given time? What is the criteria used to establish HDOP, is it only related to satellite location and signal strength? We provide HDOP and … Continue reading “What information is available to indicate the degree of accuracy of the GPS data at any given time?”
What does the GPS firmware do with the acceleration / speed at high altitude build for us to 135k feet?
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?”