MULTI-CHANNEL MULTI-SYSTEM RADIO-FREQUENCY UNIT OF SATELLITE NAVIGATION RECEIVER

摘要

The invention relates to multi-system radio frequency units of satellite navigation receivers and can be used to simultaneously receive any combination of navigation signals from several navigation systems: GLONASS, GPS, Galileo, BeiDou, IRNSS, QZSS. The unit contains three identical and independent receiving channels with isolation from mutual signal penetration and interference, simultaneously receiving signals from GLONASS / GPS / Galileo / BeiDou / COMPASS / QZSS navigation systems in various combinations, and one channel for receiving S-band signals from the regional navigation satellite system of India (IRNSS), L2, L3, L5 bands and 65-862 MHz bands, including useful information signals such as differential correction data (RTK). The block also contains four local oscillator frequency synthesizers, a local oscillator quadrature signal generator for quadrature mixers for each channel, and a system for automatic calibration of the intermediate frequency filter band for each channel. Three identical channels for receiving signals L1, E1, B1, E6, B3, L2, L3, B2, L5, E5 of the ranges have a switchable mode of operation on the output of the channels with a choice of real or complex outputs.