Loran-C transmitter main circuit and transmission waveform generation method therefor

Abstract

The invention provides a Loran-C transmitter main circuit and a transmission waveform generation method therefor. The main circuit comprises a plurality of solid-state power amplifier units of a D type, a plurality of synthesis transformers, and a matching tuning unit. The solid-state power amplifier units of the D type and the plurality of synthesis transformers combine a stepped voltage waveform consistent with a reference excitation voltage waveform, and the matching tuning unit is used for generating a transmitted Loran-C current waveform through the combined stepped voltage waveform. The high-efficiency characteristics of the solid-state power amplifier units of the D type enable the overall efficiency of a transmitter to be greatly improved. The solid-state power amplifier units of the D type and the synthesis transformers are in series-parallel connection to expand the capacity, thereby meeting the requirements of different power levels, such as the levels from 100kW to 2MW. The transmitter does not need to be repeatedly designed in engineering realization for different demands. Meanwhile, the Loran-C transmitter is enabled to achieve the full-digital step wave combination in the whole Loran pulse time period.

Description

technical field [0001] The invention relates to the field of radio signal transmission, and more specifically, to a main circuit of a Loran C transmitter and a method for generating a transmission waveform thereof. Background technique [0002] The full name of Roland is long-range navigation. Roland C is a long-range hyperbolic radio navigation system with a working distance of up to 2000 kilometers, a center frequency of 100kHz, and an envelope of exponential phase modulation pulses. It has become a modern radio positioning, navigation, and timing system. An international standard radio signal widely used by the system. It successfully solves the problem of periodic identification and adopts technologies such as phase comparison, multi-pulse coding and correlation detection, and becomes a common navigation and positioning system for land, sea and air. The Roland C system consists of a main station on the ground and a chain of 2 to 3 sub-stations, as well as receiving equi...

AI Technical Summary

Problems solved by technology

This Loran C transmitter has the problem of low efficiency. It only generates the excitation current in the first four and a half cycles. It adopts a relatively complicated way of indirectly regulating the Roland waveform, which greatly limits the radio navigation and radio navigation based on Roland C. Improvement of timing system performance indicators

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