Hello,
We are trying to use the nrf91 GNSS with the `nrf_modem_gnss` library. I'm looking for clarification on these fields that are listed in `struct nrf_modem_gnss_agps_data_location`, as the comments about the "coded number K" are a little unclear:
773 /** Uncertainty, semi-major. Range 0...127 or 255 for missing latitude and longitude. 774 * The uncertainty (in meters) is mapped from the coded number K with following formula: 775 * r = C * ((1 + x)^K - 1), where C = 10 and x = 0,1. Range of r (in kilometers) 0...1800. 776 * 777 * @note Value 255 is only supported by modem firmware v1.3.0 or later. 778 */ 779 uint8_t unc_semimajor; 780 781 /** Uncertainty, semi-minor. Range 0...127 or 255 for missing latitude and longitude. 782 * The uncertainty (in meters) is mapped from the coded number K with following formula: 783 * r = C * ((1 + x)^K - 1), where C = 10 and x = 0,1. Range of r (in kilometers) 0...1800. 784 * 785 * @note Value 255 is only supported by modem firmware v1.3.0 or later. 786 */ 787 uint8_t unc_semiminor; 788 799 800 /** The confidence level (expressed as a percentage) with which 801 * the position of a target entity is included within the uncertainty ellipsoid. 802 * Range 0...128. '0' indicates 'no information'. 803 * Values 101..128 should be treated as '0'. 804 */ 805 uint8_t confidence;
Right now, we only are able to obtain the latitude, longitude, and accuracy value as a hint that is acquired from a google location API. Is there a way to translate those into unc_semimajor, unc_semiminor, and confidence to pass to the GNSS module as a location hint?
Thank you!
