GPS time UTC time Beijing time refers to what?

The entire earth is divided into twenty-four time zones, each with its own local time. In the case of international radio communications, for the sake of consistency, a unified time is used, known as Universal Time Coordinated (UTC). UTC is the same as Greenwich Mean Time (GMT), which is the same as in London, UK.

GPS generally outputs NMEA 0183, which has a clear definition for GPGGA and GPRMC, such as: $GPGGA,100639.00,3109.79801,N,12123.38493,E,1,07,1.20,21.9,M,8.0,M,,*5D 100639.00 represents 10:06:39 of UTC time. If it is counted as Beijing time, plus 8 hours, it is 18:06:39. $GPRMC,100640.00,A,3109.79805,N,12123.38495,E,0.008,,091106,,,A*7C 091106 represents November 09, 2006, which is also UTC time. If you want to count the time of Beijing time, you must spend time with time. consider.

The time of the GPS system is different from the UTC time, which is a leap second, because the UTC time can be adjusted, and the GPS time is continuous. The leap second is reflected in the downlink navigation message. When Beijing = GPS + 8 hours - leap second. GPGGA and GPRMC itself have converted GPS time to UTC time, so this time is only 8 hours away from Beijing time, GPS time is displayed at 0:00 on February 28 (assuming the year is not a leap year), Beijing time is February 8 o'clock on the 28th; GPS time is 15 o'clock on February 27th, then Beijing time is 23 o'clock on February 27; GPS time is 18 o'clock on February 27, Beijing time is 2 o'clock on February 28; GPS time At 18 o'clock on February 28th, Beijing time is March 1, 2 o'clock.

Currently, Network Time Protocol (NTP) is an accurate, standard, secure, reliable, and multi-functional time service solution for network devices. It can provide accurate synchronous clock signals and supports standard NTP and SNTP (Simple NTP). The network-to-time protocol uses a secure MD5 protocol and certificate encryption method. It has a complete logging function and USB port download function. It supports NTP network timing, serial port timing, 10MHz frequency signal, and 1PPS pulse signal output. Dry contact alarm signal Other functions.