阅读说明：本技术 一种全数字化多普勒甚高频全向信标系统 (Full-digital Doppler very-high-frequency omnidirectional beacon system ) 是由 冉银龙 王杰 杨志强 于 2019-10-22 设计创作，主要内容包括：本发明涉及导航领域,尤其涉及一种全数字化多普勒甚高频全向信标系统,具体包括：电源单元PWU、本地控制单元LCU、监控器单元MCU、信号激励单元SGU、发射切换单元TCU以及天线转换单元ASU,本地控制单元LCU主要完成DVOR信标操作控制、状态显示以及相应通信功能；信号激励单元SGU主要生产调幅载波和边带信号,并且对其进行校准；发射切换单元TCU对边带信号和调幅载波进行采样；监控器单元MCU监控信号指标是否合格；本方案通过数字化DDS产生激励信号,同时通过DDS调整幅度相位实现系统校准；运用射频直接采样技术,简化了模块设计,系统尺寸进一步减小,功耗降低。(The invention relates to the navigation field, in particular to a full-digital Doppler very high frequency omnidirectional beacon system, which specifically comprises the following steps: the system comprises a power supply unit PWU, a local control unit LCU, a monitor unit MCU, a signal excitation unit SGU, a transmission switching unit TCU and an antenna switching unit ASU, wherein the local control unit LCU mainly completes DVOR beacon operation control, state display and corresponding communication functions; the signal excitation unit SGU mainly produces amplitude-modulated carrier and sideband signals and calibrates them; the TCU samples the sideband signal and the amplitude modulation carrier; the monitor unit MCU monitors whether the signal index is qualified; according to the scheme, an excitation signal is generated through a digital DDS, and meanwhile, the amplitude and the phase are adjusted through the DDS to realize system calibration; by using the radio frequency direct sampling technology, the module design is simplified, the system size is further reduced, and the power consumption is reduced.)

1. A fully digital doppler vhf omni-directional beacon system, comprising: the system comprises a transmission switching unit TCU, a signal excitation unit SGU, a monitor unit MCU, an antenna switching unit ASU and a local control unit LCU;

the emission switching unit TCU is connected with the signal excitation unit SGU;

the signal excitation unit SGU generates an amplitude modulation carrier and a sideband signal through the DDS, sends the amplitude modulation carrier and the sideband signal to the transmission switching unit TCU, and carries out real-time calibration according to the amplitude of the amplitude modulation carrier and the sideband signal fed back by the transmission switching unit TCU and the phase of the sideband signal;

the transmission switching unit TCU adopts a software radio architecture, and after receiving the amplitude-modulated carrier and the sideband signals, the transmission switching unit TCU carries out radio frequency sampling operation on the amplitude-modulated carrier and the sideband signals through an ADC (analog to digital converter), and feeds back the amplitudes of the amplitude-modulated carrier and the sideband signals and the phase of the sideband signals obtained by the operation to the signal excitation unit SGU;

the monitor unit MCU is respectively connected with the emission switching unit TCU and the signal excitation unit SGU;

the monitoring unit MCU is internally provided with a software radio framework, is connected with the monitoring antenna, and is used for carrying out ADC radio frequency sampling processing on the space signal coupled by the monitoring antenna and calculating various technical parameters of the space signal;

the antenna conversion unit ASU is connected with the emission switching unit TCU, receives the amplitude modulation carrier wave and the sideband signal transmitted by the emission switching unit, and radiates the amplitude modulation carrier wave and the antenna signal;

and the local control unit LCU is connected with the monitor unit MCU to realize the operation control, state display and communication functions of the Doppler very high frequency omnidirectional beacon system.

2. The fully digital doppler very high frequency omni-directional beacon system according to claim 1, further comprising a power supply unit PWU;

and the power supply unit PWU is respectively connected with the emission switching unit TCU, the signal excitation unit SGU, the monitor unit MCU and the local control unit LCU to realize power supply of each unit.

3. The full digital Doppler very high frequency omnidirectional beacon system according to claim 1, wherein the monitor unit MCU is connected to the transmission switching unit TCU, the signal excitation unit SGU and the local control unit LCU through UART respectively, and the transmission switching unit TCU is connected to the signal excitation unit SGU through UART.

4. The system of claim 2, wherein the sideband signal transmitted by the signal driver SGU sequentially passes through a circulator and a filter, and then enters the transmission switching unit TCU.

5. The system of claim 4, wherein the amplitude modulated carrier transmitted by the signal driver unit SGU passes through a filter and then enters the transmission switching unit TCU.

6. The system of claim 1 or 5, wherein the transmission switching unit TCU further couples forward and backward the amplitude modulated carrier and sideband signals through a directional coupler, the forward coupled amplitude modulated carrier and sideband signals are used as forward coupled signals for radiation, and the backward coupled amplitude modulated carrier and sideband signals are used for fault detection.

7. The system according to claim 1, wherein the technical parameters of the spatial signal include carrier power, carrier modulation, subcarrier modulation, and Morse code.

Technical Field

The invention relates to the field of navigation, in particular to a full-digital Doppler very high frequency omnidirectional beacon system.

Background

The Doppler very high frequency omnidirectional beacon (DVOR) is an important guarantee of land-based navigation equipment, and the omnidirectional beacon developed by utilizing the Doppler effect principle has the basic function of providing a complex radio signal for airborne VOR equipment, and after being demodulated by an airborne VOR receiver, the VOR direction of the ground very high frequency omnidirectional beacon relative to an airplane is measured, and a pilot can adjust the airplane route or land according to the comparison of the direction and the preset direction.

At present, Doppler very high frequency omnidirectional beacons installed in domestic airports are mainly products of two families, namely AWA and THELES, domestic manufacturers are mainly Tianjin 764 factories, and domestic active DVOR including 764 latest equipment is built by analog circuits, so that the DVOR system has four defects:

1. the volume is large, the power consumption is large, and the requirement on the temperature of the installation environment is high;

2. the equipment is influenced by the analog device, is easy to age, has higher maintenance cost and is inconvenient to use;

3. the interference is easy to occur, and the precision is not high enough;

4. and the installation and debugging are complicated.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: aiming at the existing problems, the full digitalization Doppler very high frequency omnidirectional beacon system is provided, the system adopts the concept of full digitalization system design, and compared with a very high frequency omnidirectional beacon machine designed in a traditional simulation mode, the system excitation, system calibration, system parameter monitoring and other functions are realized at lower cost.

The technical scheme adopted by the invention is as follows: a fully digital doppler very high frequency omni-directional beacon system, comprising: the system comprises a transmission switching unit TCU, a signal excitation unit SGU, a monitor unit MCU, an antenna switching unit ASU and a local control unit LCU;

the emission switching unit TCU is connected with the signal excitation unit SGU;

the signal excitation unit SGU generates an amplitude modulation carrier and a sideband signal through the DDS, sends the amplitude modulation carrier and the sideband signal to the transmission switching unit TCU, and carries out real-time calibration according to the amplitude of the amplitude modulation carrier and the sideband signal fed back by the transmission switching unit TCU and the phase of the sideband signal;

the transmission switching unit TCU adopts a software radio architecture, and after receiving the amplitude-modulated carrier and the sideband signals, the transmission switching unit TCU carries out radio frequency sampling operation on the amplitude-modulated carrier and the sideband signals through an ADC (analog to digital converter), and feeds back the amplitudes of the amplitude-modulated carrier and the sideband signals and the phase of the sideband signals obtained by the operation to the signal excitation unit SGU;

the monitor unit MCU is respectively connected with the emission switching unit TCU and the signal excitation unit SGU;

the monitoring unit MCU is internally provided with a software radio framework, is connected with the monitoring antenna, and is used for carrying out ADC radio frequency sampling processing on the space signal coupled by the monitoring antenna and calculating various technical parameters of the space signal;

the antenna conversion unit ASU is connected with the emission switching unit TCU, receives the amplitude modulation carrier wave and the sideband signal transmitted by the emission switching unit, and radiates the amplitude modulation carrier wave and the antenna signal;

and the local control unit LCU is connected with the monitor unit MCU to realize the operation control, state display and communication functions of the Doppler very high frequency omnidirectional beacon system.

Further, the system also comprises a power supply unit PWU;

and the power supply unit PWU is respectively connected with the emission switching unit TCU, the signal excitation unit SGU, the monitor unit MCU and the local control unit LCU to realize power supply of each unit.

Further, the monitor unit MCU is connected to the transmission switching unit TCU, the signal excitation unit SGU, and the local control unit LCU through the UART, respectively, and the transmission switching unit TCU is connected to the signal excitation unit SGU through the UART. UARTs facilitate signal transmission within the system.

Furthermore, sideband signals transmitted by the signal excitation unit SGU sequentially pass through the circulator and the filter and then enter the transmission switching unit TCU. The circulator finishes the protection of the signal excitation unit SGU, and prevents the signal excitation unit SGU from being damaged due to no load when switching time sequence deviation occurs in the switching process of the antenna switch. The filter functions to filter out harmonics.

Furthermore, the amplitude-modulated carrier wave transmitted by the signal excitation unit SGU passes through a filter and then enters the transmission switching unit TCU. The filter functions to filter out harmonics.

Furthermore, the emission switching unit TCU further performs forward coupling and backward coupling on the amplitude modulated carrier and the sideband signal through a directional coupler, the forward coupled amplitude modulated carrier and sideband signal are used as forward coupled signals for radiation, and the backward coupled amplitude modulated carrier and sideband signal are used for fault detection.

Furthermore, each technical parameter of the spatial signal includes carrier power, carrier modulation degree, amplitude-carrier modulation degree and Morse code.

Compared with the prior art, the beneficial effects of adopting the technical scheme are as follows: the system generates an excitation signal through a digital DDS, and simultaneously realizes system calibration through adjusting the amplitude and phase through the DDS. The emission switching calibration and monitoring module adopts a software radio architecture, applies a radio frequency direct sampling technology, simplifies the module design, and realizes the full digitalization in front of an antenna port, so that the calibration and index monitoring with higher precision can be further realized, the radio frequency index of the system is more optimized, meanwhile, the system interference resistance of the digital calibration detection and monitoring system is good, the size of the system is further reduced, and the power consumption is further reduced.

Drawings

FIG. 1 is an overall architecture diagram of the present system;

fig. 2 is a schematic diagram of the fully digital design of the partial units in the system.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

The technical terms appearing in the present application are explained below.

DDS: a direct digital frequency synthesizer;

UART: a universal asynchronous transceiver transmitter;

ADC: an analog/digital converter.