CN108827272B - Radio compass signal simulation device and method based on PXI bus - Google Patents
Radio compass signal simulation device and method based on PXI bus Download PDFInfo
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- CN108827272B CN108827272B CN201810621274.0A CN201810621274A CN108827272B CN 108827272 B CN108827272 B CN 108827272B CN 201810621274 A CN201810621274 A CN 201810621274A CN 108827272 B CN108827272 B CN 108827272B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C17/00—Compasses; Devices for ascertaining true or magnetic north for navigation or surveying purposes
- G01C17/38—Testing, calibrating, or compensating of compasses
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Abstract
The invention discloses a PXI bus-based radio compass signal simulation device and a PXI bus-based radio compass signal simulation method, wherein the radio compass signal simulation device comprises the following steps: the audio modulation signal acquisition circuit acquires two paths of orthogonal audio modulation signals of the radio compass receiver and sends the acquired signals to the FPGA control and signal synthesis module; the output end of the FPGA control and signal synthesis module is sequentially connected with an analog signal generation circuit, a signal amplification circuit and an attenuation circuit; the FPGA control and signal synthesis module is also connected with the PXI interface; the PXI interface is connected with an upper computer and used for transmitting azimuth simulation angle information and carrier signal frequency and amplitude control information sent by the upper computer. The PXI bus radio compass signal simulation device has the advantages of high azimuth simulation precision, small volume, low power consumption, suitability for external field application, easiness in constructing a miniaturized PXI bus navigation test system and the like.
Description
Technical Field
The invention relates to the technical field of radio compasses, in particular to a PXI bus-based radio compass signal simulation device and method.
Background
The radio compass is also called automatic orientation machine (ADF), is a non-autonomous amplitude direction finding short-range navigation equipment, its corresponding ground radio navigation station is directional beacon (NDB), ADF-NDB is the first radio navigation system used for aviation, because it has the advantages of simple structure, convenient use and maintenance, low price, etc., it is still widely used for aircraft navigation so far, and becomes a stock navigation equipment of various airplanes including helicopter at present, and is an important component of avionic system.
Before and after the completion of a combat mission, in the processes of daily maintenance and the like, the radio compass equipment is required to carry out field maintenance guarantee work so as to ensure the function normality and the performance index of the radio compass equipment, and the radio compass signal simulation device can provide necessary excitation signals for the maintenance and the detection of a radio compass receiver. The quality of the analog signal generated by the radio compass signal simulation means directly determines the radio compass detection and maintenance level. Because the maintenance and detection of the airborne navigation equipment need to be carried out by an external field, the radio compass simulation device is required to be small in size, light in weight and easy to carry. And at present, a plurality of airborne navigation devices are provided, and a navigation test system is often constructed by a plurality of navigation simulation devices and test module instruments, so that the radio compass simulation device is required to have a universal standard bus interface, and the system is convenient to construct.
The prior art discloses a technical scheme that a single chip microcomputer is operated through a man-machine interface to control a DDS chip, three radio frequency signals with the frequency of 150-1750 kHz are generated, the three radio frequency signals are respectively used as a vertical antenna signal, a sine loop antenna signal and a cosine loop antenna signal, and the three radio frequency signals are respectively processed through an amplifying circuit, an attenuating circuit and a filtering circuit. As shown in fig. 1, the sine and cosine loop antenna signals are balanced and modulated with two orthogonal audio modulation signals generated by the radio compass receiver, and the modulated two loop antenna signals are superposed with the vertical antenna signal to obtain a final simulated radio compass signal simulation signal. The radio compass signal simulation device in the technical scheme has larger weight and volume, is generally only suitable for being used independently and is not suitable for constructing a miniaturized PXI bus navigation test system; secondly, the signal modulation process and the signal superposition process are all realized by adopting an analog circuit, so that the circuit complexity is increased, and the azimuth simulation precision is low; finally, the three paths of radio frequency signals are amplified, attenuated and filtered, so that the circuit scale and the component cost are increased.
The prior art radio compass signal simulation device generally has the following disadvantages:
1. the existing radio compass signal simulation device has large volume and weight, and is not suitable for detection and maintenance guarantee of radio compass field and outfield.
2. The existing radio compass signal simulation device does not have a PXI standard bus, and is not beneficial to establishing a miniaturized PXI bus navigation test system together with other navigation simulation module devices.
Disclosure of Invention
The invention aims to solve the problems and provides a radio compass signal simulation device and a radio compass signal simulation method based on a PXI bus aiming at the technical principle of a combined antenna radio compass. A novel full digital compass signal simulation mode is adopted, so that the simulation azimuth precision is improved, and the circuit complexity is reduced. The whole device is a PXI bus 3U single-slot module and only consists of a single board, so that convenience is brought to external field portable testing, and a miniaturized PXI bus navigation testing system is favorably established.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention discloses a PXI bus-based radio compass signal simulation device, which comprises: the device comprises an audio modulation signal acquisition circuit, an attenuation circuit, a signal amplification circuit, an analog signal generation circuit and an FPGA control and signal synthesis module;
the audio modulation signal acquisition circuit acquires two paths of orthogonal audio modulation signals of the radio compass receiver and sends the acquired signals to the FPGA control and signal synthesis module; the output end of the FPGA control and signal synthesis module is sequentially connected with an analog signal generation circuit, a signal amplification circuit and an attenuation circuit; the FPGA control and signal synthesis module is also connected with the PXI interface; the PXI interface is connected with an upper computer and used for transmitting azimuth simulation angle information and carrier signal frequency and amplitude control information sent by the upper computer.
Further, the audio modulation signal acquisition circuit comprises:
the first single-ended to differential conversion unit and the first anti-aliasing filtering conditioning unit are connected in series; the second single-ended conversion differential unit and the second anti-aliasing filtering conditioning unit are connected in series;
the first single-end to differential conversion unit and the second single-end to differential conversion unit are respectively connected with two paths of orthogonal audio modulation signals to obtain output ends;
the first anti-aliasing filtering conditioning unit and the second anti-aliasing filtering conditioning unit are respectively connected with the input end of the ADC, and the output end of the ADC is connected with the FPGA control and signal synthesis module.
Furthermore, the FPGA control and signal synthesis module generates carrier signals in a direct digital synthesis mode, and the carrier signals are respectively used as vertical antenna signals, sine loop antenna signals and cosine loop antenna signals;
the method comprises the steps of modulating analog azimuth angle information into sine and cosine ring antenna signals by an angle information digital modulation method, carrying out balanced modulation on the sine and cosine ring antenna signals carrying the analog azimuth angle information and two paths of orthogonal audio modulation signals output by an audio modulation signal acquisition circuit through double-amplitude proportional modulation, superposing the two paths of sine and cosine ring antenna signals after balanced modulation with each other, and superposing the superposed signals with vertical antenna signals to obtain radio compass signal analog digital signals.
Further, the analog signal generating circuit includes: DAC, I/V conversion unit and low pass filter connected in series.
Furthermore, the PXI interface is sequentially connected with a PLL and a DDS in series and then is accessed to the FPGA control and signal synthesis module, the PLL circuit uses the clock signal output by the PXI interface as a reference phase-locked control to output a clock signal with a set frequency, and the DDS circuit uses the clock signal output by the PLL circuit as a reference to directly synthesize a working clock of the FPGA control and signal synthesis module.
The second purpose of the invention is to disclose a working method of a radio compass signal simulation device based on PXI bus, comprising:
the audio modulation signal acquisition circuit acquires two paths of orthogonal audio modulation signals of the radio compass receiver and processes each path of orthogonal audio modulation signal: converting the single-end audio modulation signal into a differential signal by adopting a single-end-to-differential method, and eliminating aliasing by adopting an anti-aliasing filtering method;
generating carrier signals in a direct digital synthesis mode, wherein the carrier signals are respectively used as vertical antenna signals, sine loop antenna signals and cosine loop antenna signals;
modulating the analog azimuth angle information into sine and cosine ring antenna signals by an angle information digital modulation method, respectively carrying out balanced modulation on the sine and cosine ring antenna signals carrying the analog azimuth angle information and two processed orthogonal audio modulation signals by a double-amplitude proportional modulation method, mutually superposing the two balanced and modulated sine and cosine ring antenna signals, and superposing the superposed signals and vertical antenna signals to obtain a radio compass signal analog digital signal;
and outputting an analog signal with a set dynamic range through high-precision digital-to-analog conversion and a full-digital low-step attenuation mode.
The invention has the beneficial effects that:
a radio compass signal simulation device based on a PXI bus adopts two-channel high-precision analog-to-digital conversion to acquire two paths of orthogonal audio modulation signals of a radio compass receiver, generates a digital carrier signal in a direct digital synthesis mode, then generates a radio compass analog-to-digital signal based on analog azimuth angle digital modulation and a double-amplitude proportional balance modulation full-digital synthesis technology, and realizes analog signal large-dynamic high-precision output through high-precision digital-to-analog conversion and a full-digital low-step attenuation technology. The PXI bus radio compass signal simulation device has the advantages of high azimuth simulation precision, small volume, low power consumption, suitability for external field application, easiness in constructing a miniaturized PXI bus navigation test system and the like.
Drawings
FIG. 1 is a schematic diagram of a radio compass signal simulation device in the prior art;
FIG. 2 is a schematic diagram of a radio compass signal simulation apparatus according to the present invention;
FIG. 3 is a schematic diagram of the working principle of the FPGA control and signal synthesis module of the present invention.
The specific implementation mode is as follows:
the invention is further described with reference to the following figures and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Based on the problems in the prior art pointed out in the background, the invention discloses a PXI bus-based radio compass signal simulation device. The device adopts two-channel high-precision analog-to-digital conversion to acquire two paths of orthogonal audio modulation signals of a radio compass receiver, generates a digital carrier signal in a direct digital synthesis mode, then synthesizes a radio compass analog signal in a full digital mode based on analog azimuth angle digital modulation and double-amplitude proportional balance modulation technology, and realizes the large dynamic high-precision output of the analog signal through high-precision digital-to-analog conversion and multi-level digital low-step attenuation technology.
The invention adopts a standard PXI bus and a software radio system architecture, takes a full digital synthesis mode as a core, and generates a radio compass signal analog signal based on high-precision digital-analog and analog-digital conversion, and the whole principle block diagram is shown in figure 2. The device structure is a standard PXI single-slot module and only consists of a single PCB.
The radio compass signal simulation device based on the PXI bus specifically comprises the following components: the device comprises an audio modulation signal acquisition circuit, an attenuation circuit, a signal amplification circuit, an analog signal generation circuit and an FPGA control and signal synthesis module;
the audio modulation signal acquisition circuit acquires two paths of orthogonal audio modulation signals of the radio compass receiver and sends the acquired signals to the FPGA control and signal synthesis module; the output end of the FPGA control and signal synthesis module is sequentially connected with an analog signal generation circuit, a signal amplification circuit and an attenuation circuit; the FPGA control and signal synthesis module is also connected with the PXI interface;
wherein, audio frequency modulation signal acquisition circuit includes:
the first single-ended to differential conversion unit and the first anti-aliasing filtering conditioning unit are connected in series; the second single-ended conversion differential unit and the second anti-aliasing filtering conditioning unit are connected in series;
the first single-end to differential conversion unit and the second single-end to differential conversion unit are respectively connected with two paths of orthogonal audio modulation signals to obtain output ends;
the first anti-aliasing filtering conditioning unit and the second anti-aliasing filtering conditioning unit are respectively connected with the input end of the ADC, and the output end of the ADC is connected with the FPGA control and signal synthesis module.
The PXI interface is sequentially connected with a PLL and a DDS in series and then is accessed to the FPGA control and signal synthesis module, the PLL circuit uses a 10MHz clock signal output by the PXI interface as a reference phase locking control to output a 100MHz clock signal, the DDS circuit uses the 100MHz clock signal as a reference to directly synthesize a 12.288MHz signal, and the 12.288MHz signal is sent to the FPGA to be used as an AD chip working clock.
Because the signal simulation process of the radio compass simulation device adopts a full digital synthesis mode, two paths of orthogonal audio modulation signals of the radio compass receiver need to be acquired through high-precision two-channel analog-to-digital conversion. The single-end audio modulation signal is converted into a differential signal by adopting a single-end to differential conversion technology so as to improve the anti-interference capability of the audio modulation signal. And aliasing is eliminated by adopting an anti-aliasing filtering technology, so that the audio signal acquisition precision is further ensured.
The carrier signal is generated by a direct digital synthesis mode, and the signal frequency is 150 kHz-1750 kHz. The carrier signal is used as a vertical antenna signal, a sine ring antenna signal and a cosine ring antenna signal, the analog azimuth angle information is modulated into the sine and cosine ring antenna signals by an angle information digital modulation method, the sine and cosine ring antenna signals carrying the analog azimuth angle information are respectively balanced and modulated with two paths of orthogonal audio modulation signals by a double-amplitude proportional modulation technology, the two paths of sine and cosine ring antenna signals after balanced modulation are mutually superposed, and the superposed signals are superposed with the vertical antenna signal to obtain the analog digital signal of the radio compass signal. The generation of vertical antenna signals and sine and cosine antenna signals, the modulation of analog azimuth angle information, the double-amplitude proportional balance modulation and other related signal processing are all completed in the FPGA, the circuit structure is simplified, and the signal processing flow is shown in figure 3.
Since the received signal of the radio compass is a weak signal in microvolt level, and the amplitude is below 10 μ V, 1 μ V amplitude stepping is needed. Therefore, the analog signal with the dynamic range of 100 mV-1 μ V is output through high-precision digital-to-analog conversion and a full-digital low-stepping attenuation mode. And converting the differential current signal into a single-ended voltage signal by an I/V conversion technology. Filtering is carried out through a high-order passive elliptic filter, out-of-band interference signals are filtered, and the purity of output signals is improved.
The radio compass signal simulation device based on the PXI bus has the PXI standard bus and a software radio system architecture, can be independently used, and is easy to establish a miniaturized PXI bus navigation test system together with other navigation simulation module devices and test module devices.
The invention adopts two-channel high-precision analog-to-digital conversion to acquire two paths of orthogonal audio modulation signals of the radio compass receiver and adopts a single-end-to-differential conversion technology to improve the anti-interference capability of the audio modulation signals.
The invention adopts an analog azimuth angle digital modulation technology to modulate analog azimuth angle information into a carrier signal, and adopts a double-amplitude proportional equilibrium modulation full digital synthesis technology to generate a radio compass signal analog digital signal.
The invention realizes the large dynamic high precision stable output of analog signals by high precision digital-to-analog conversion and full digital low step attenuation technology, and filters out-of-band interference signals by adopting a high-order passive elliptic filter.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (5)
1. Radio compass signal simulation device based on PXI bus is characterized by comprising: the device comprises an audio modulation signal acquisition circuit, an attenuation circuit, a signal amplification circuit, an analog signal generation circuit and an FPGA control and signal synthesis module;
the audio modulation signal acquisition circuit acquires two paths of orthogonal audio modulation signals of the radio compass receiver and sends the acquired signals to the FPGA control and signal synthesis module; the output end of the FPGA control and signal synthesis module is sequentially connected with an analog signal generation circuit, a signal amplification circuit and an attenuation circuit; the FPGA control and signal synthesis module is also connected with the PXI interface; the PXI interface is connected with an upper computer and used for transmitting azimuth simulation angle information and carrier signal frequency and amplitude control information sent by the upper computer;
the FPGA control and signal synthesis module generates carrier signals in a direct digital synthesis mode, and the carrier signals are respectively used as vertical antenna signals, sine loop antenna signals and cosine loop antenna signals;
the method comprises the steps of modulating analog azimuth angle information into sine and cosine ring antenna signals by an angle information digital modulation method, carrying out balanced modulation on the sine and cosine ring antenna signals carrying the analog azimuth angle information and two paths of orthogonal audio modulation signals output by an audio modulation signal acquisition circuit through double-amplitude proportional modulation, superposing the two paths of sine and cosine ring antenna signals after balanced modulation with each other, and superposing the superposed signals with vertical antenna signals to obtain radio compass signal analog digital signals.
2. The PXI bus-based radio compass signal simulation apparatus of claim 1, wherein said audio modulation signal acquisition circuit comprises:
the first single-ended to differential conversion unit and the first anti-aliasing filtering conditioning unit are connected in series; the second single-ended conversion differential unit and the second anti-aliasing filtering conditioning unit are connected in series;
the first single-end to differential conversion unit and the second single-end to differential conversion unit are respectively connected with two paths of orthogonal audio modulation signals to obtain output ends;
the first anti-aliasing filtering conditioning unit and the second anti-aliasing filtering conditioning unit are respectively connected with the input end of the ADC, and the output end of the ADC is connected with the FPGA control and signal synthesis module.
3. The PXI bus-based radio compass signal simulation apparatus of claim 1, wherein said analog signal generation circuit comprises: DAC, I/V conversion unit and low pass filter connected in series.
4. The PXI-bus-based radio compass signal simulation apparatus of claim 1, wherein the PXI interface is sequentially connected in series with the PLL and the DDS and then connected to the FPGA control and signal synthesis module, the PLL circuit uses the clock signal output by the PXI interface as a reference to phase-lock control and output a clock signal with a set frequency, and the DDS circuit uses the clock signal output by the PLL circuit as a reference to directly synthesize the operating clock of the FPGA control and signal synthesis module.
5. A working method of a PXI bus-based radio compass signal simulation device is characterized by comprising the following steps:
the audio modulation signal acquisition circuit acquires two paths of orthogonal audio modulation signals of the radio compass receiver and processes each path of orthogonal audio modulation signal: converting the single-end audio modulation signal into a differential signal by adopting a single-end-to-differential method, and eliminating aliasing by adopting an anti-aliasing filtering method;
generating carrier signals in a direct digital synthesis mode, wherein the carrier signals are respectively used as vertical antenna signals, sine loop antenna signals and cosine loop antenna signals;
modulating the analog azimuth angle information into sine and cosine ring antenna signals by an angle information digital modulation method, respectively carrying out balanced modulation on the sine and cosine ring antenna signals carrying the analog azimuth angle information and two processed orthogonal audio modulation signals by a double-amplitude proportional modulation method, mutually superposing the two balanced and modulated sine and cosine ring antenna signals, and superposing the superposed signals and vertical antenna signals to obtain a radio compass signal analog digital signal;
and outputting an analog signal with a set dynamic range through high-precision digital-to-analog conversion and a full-digital low-step attenuation mode.
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| CN112684716A (en) * | 2020-11-25 | 2021-04-20 | 广州斯达尔科技有限公司 | Aviation radio comprehensive test equipment and control method |
| CN113820975A (en) * | 2021-08-28 | 2021-12-21 | 国营芜湖机械厂 | Combined programmable radio beacon simulator |
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| CN102265521A (en) * | 2008-12-23 | 2011-11-30 | 北方电讯网络有限公司 | Reducing power levels associated with two or more signals using peak reduction distortion that is derived from a combined signal |
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