CN110703184A - Full-digital Doppler very-high-frequency omnidirectional beacon system - Google Patents
Full-digital Doppler very-high-frequency omnidirectional beacon system Download PDFInfo
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- CN110703184A CN110703184A CN201911005520.0A CN201911005520A CN110703184A CN 110703184 A CN110703184 A CN 110703184A CN 201911005520 A CN201911005520 A CN 201911005520A CN 110703184 A CN110703184 A CN 110703184A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
- G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
- G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
- G01S1/022—Means for monitoring or calibrating
Abstract
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.
Description
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.
Example 1
As shown in fig. 1 and 2, the system includes 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.
The local control unit LCU is connected with the monitor unit MCU, and mainly completes DVOR (Doppler very high frequency) beacon operation control, state display and corresponding communication functions.
The signal excitation unit SGU is respectively connected with the transmission switching unit TCU and the monitor unit MCU, the signal excitation unit SGU mainly completes modulation generation and power amplification of a transmission signal, the signal excitation unit SGU generates 1 path of amplitude modulation carrier and 4 path of sideband signals through 5 paths of DDS, the amplitude modulation carrier and the 4 path of sideband signals are sent to the transmission switching unit TCU, the amplitude and the phase of the 5 path of DDS are calibrated in real time according to the amplitude of the amplitude modulation carrier and the 4 path of sideband signals fed back by the transmission switching unit TCU and the phase of the 4 path of sideband signals, wherein the 4 path of sideband signals specifically comprise two paths of sideband signals [ USB (universal serial bus) signals) modulated by a mixing functions(Sin2720*USB),USBc(Cos2720*USB)]Two-path lower sideband signal [ LSB ] after mixed function modulations(Sin2720*LSB),LSBc(Cos2720*LSB)]。
After receiving the amplitude modulation carrier and the 4-way sideband signal, the transmission switching unit TCU carries out radio frequency sampling on the amplitude modulation carrier and the 4-way sideband signal through the ADC, the sampled data is sent to an FPGA inside the transmission switching unit TCU for operation, and then the amplitude of the amplitude modulation carrier and the 4-way sideband signal obtained through operation and the phase of the 4-way sideband signal are fed back to the signal excitation unit SGU for real-time calibration.
The monitor unit MCU is respectively connected with the emission switching unit TCU and the signal excitation unit SGU; the monitoring unit MCU is connected with the monitoring antenna, ADC radio frequency sampling processing is carried out on the space signal coupled by the monitoring antenna, and each technical parameter of the space signal is calculated by an FPGA in the monitoring unit MCU; and simultaneously monitoring whether each index of the space radiation signal meets the requirement, and if not, informing the Local Control Unit (LCU) of switching the extension or shutting down.
The antenna switching unit ASU is connected with the transmitting switching unit TCU, receives the calibrated amplitude modulation carrier wave and the 4 paths of sideband signals transmitted by the transmitting switching unit TCU, and selects 4 paths of the carrier wave and the 4 paths of sideband signals in a time-sharing manner according to a fixed time sequence to radiate the signals.
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, and power supply of all units is realized.
Example 2
Preferably, the transmission switching unit TCU and the monitor unit MCU both use a software radio architecture to implement digital design of the system.
Example 3
Preferably, 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. And the UART is used for transmitting signals, so that stable transmission of the signals is facilitated.
Example 4
As shown in fig. 2, preferably, the 4-way sideband signal transmitted by the signal excitation unit SGU enters the filter through the circulator, and the circulator completes protection of the signal excitation unit SGU, so as to prevent the idle load from occurring when the switching timing sequence deviation occurs in the switching process of the antenna switch, which causes damage to the working signal excitation unit SGU; the filter filters the harmonics of the 4-way sideband signal and then transmits the 4-way sideband signal to the transmission switching unit TCU. The signal channel of the amplitude-modulated carrier wave is not converted by the antenna, so that the amplitude-modulated carrier wave is not required to pass through the circulator, and is transmitted to the transmission switching unit TCU after the harmonic wave is filtered by the filter.
Example 5
As shown in fig. 2, preferably, after receiving the amplitude modulated carrier and the 4-way sideband signal after the harmonic filtering, the transmission switching unit TCU performs forward coupling and backward coupling on the amplitude modulated carrier and the 4-way sideband signal by using the directional coupler, where the amplitude modulated carrier and the sideband signal after the forward coupling are output to the antenna conversion unit ASU for radiation, and the amplitude modulated carrier and the sideband signal after the backward coupling are used for fault detection to detect whether a subsequent radio frequency channel is unblocked.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed. Those skilled in the art to which the invention pertains will appreciate that insubstantial changes or modifications can be made without departing from the spirit of the invention as defined by the appended claims.
Claims (7)
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.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911005520.0A CN110703184A (en) | 2019-10-22 | 2019-10-22 | Full-digital Doppler very-high-frequency omnidirectional beacon system |
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| CN201911005520.0A CN110703184A (en) | 2019-10-22 | 2019-10-22 | Full-digital Doppler very-high-frequency omnidirectional beacon system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113067684A (en) * | 2021-03-18 | 2021-07-02 | 四川九洲空管科技有限责任公司 | Transmitter dual-machine switching system and method of Doppler very high frequency omnidirectional beacon |
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Cited By (2)
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| CN113067684A (en) * | 2021-03-18 | 2021-07-02 | 四川九洲空管科技有限责任公司 | Transmitter dual-machine switching system and method of Doppler very high frequency omnidirectional beacon |
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