CN202261305U - ADF antenna signal emulator having modularized VXI - Google Patents

Abstract

The utility model relates to an avionics navigation antenna signal simulator, in particular to a VXI modularized ADF antenna signal simulator. A VXI modular ADF antenna signal emulator, the input data buffer interface is connected to the operation module, the operation module is respectively connected to the exchange data buffer interface and the DDS module, the exchange data buffer interface is connected to the DSP, and the RS232 of the VXI modular ADF antenna signal emulator The interface is respectively connected to the DSP and the upper computer, the operation module outputs signals through the radio frequency channel, and the receiver is connected to the input data buffer interface through the ADC. The utility model has the advantages of small size, convenient assembly and disassembly, easy integration, programmable control of the emulator, and small azimuth steps.

Description

The modular ADF aerial signal of a kind of VXI simulator

Technical field

The utility model relates to aviation electronics navigation antenna signal simulator, and is particularly a kind of with the modular ADF aerial signal of VXI simulator.

Background technology

In the maintainability test of airborne ADF, the radiofrequency signal that can encourage airborne ADF need be provided, this radiofrequency signal has comprised the needed azimuth information of the airborne ADF function of test.ADF aerial signal simulator is exactly a kind of ground installation that this radiofrequency signal can be provided.The method that realizes airborne ADF excitation traditionally has two kinds: a kind of is to simulate true ADF operational environment through shielded box to realize; A kind of is to realize through simulated mode.These two kinds of methods all have corresponding shortcoming and use restriction.For the shielded box method, its shortcoming is that volume is big, and mode of operation is manually, can't satisfy the demand of automatic test; For simulation realization method, its shortcoming is that the angle signal of simulation is discontinuous adjustable, needs the input CF signal, can't realize remote automation control etc.

Summary of the invention

In order to overcome the defective of present airborne ADF aerial signal motivational techniques, satisfy the demand that automation is surveyed, the utility model provides the modular ADF aerial signal of a kind of VXI simulator.

The modular ADF aerial signal of a kind of VXI simulator; Form by input data buffering interface, computing module, swap data buffer interface, DDS module, radio-frequency channel, RS232 interface; Input data buffering interface concatenation operation module; Computing module connects swap data buffer interface, DDS module respectively, and the swap data buffer interface connects DSP, and the RS232 interface of the modular ADF aerial signal of VXI simulator connects DSP and host computer respectively; Computing module is in addition through radio-frequency channel output signal, and receiver connects input data buffering interface through ADC.

At first, the sin that sends of ADF receiver and cos two-way low frequency reference signal are through getting into the data buffering interface of FPGA after the ADC digitlization.FPGA receives the control command that host computer sends through serial ports, and transfers commands to DSP, and calculate information such as carrier wave, orientation by DSP and pass back to FPGA, and then DDS module and arithmetical operation module among the control FPGA, be accomplished to synthesizing of ADF aerial signal.The digital signal of synthetic output converts analog signal into through DAC, again output after the conditioning of radio-frequency channel.

DSP (digital signal processor) is a kind of microprocessor of uniqueness, is the device of handling bulk information with digital signal.Its operation principle is to receive analog signal, converts 0 or 1 digital signal into.Again digital signal is made amendment, deletes, strengthened, and in the other system chip, return analogue data or actual environment form to the numerical data decipher.

VXI module bus system or its subsystem are made up of a VXIbus mainframe box, plurality of V XIbus device, VXIbus explorer and master controller; Zero channel mould piece is accomplished the System Backplane management; Comprise clock source and core bus arbitration etc. are provided, it also can have other instrumental function simultaneously certainly.Explorer is configured system when system powers on or reset, so that system user can be since a definite state system operation.After system's operate as normal, explorer just no longer works.Mainframe box holds the VXIbus instrument, and for it communication backplane, power supply and cooling is provided.Five tame instrument companies such as HP, Tekronix have set up VXIbus association, and have issued first version of VXI standard in 1987.Several times modification and perfect was received to the IEEE-1155-1992 standard with 1992 by IEEE.

ADF is by antenna, receives the news machine, RMI (magnetic direction indicator: Rotary Magnetic Indicator) and controller form.Antenna then is to be made up of ring Shape antenna (Loop Antenna) and sense antenna (Sense Antenna).Can find out automatically transmit on the ground the sender that send news signal (continuous wave or the continuous wave that modifies tone with distinguished symbol) to action be called the ADF waveform; Be to use the signal of ring Shape antenna and sense antenna this time; If only need receive aphalangia to data and distinguished symbol, just single sense antenna (ANT waveform) that uses.The installation site of antenna is to be located at body upside or the rough centre of downside, and ring Shape antenna, sense antenna and quadrant error correction device and amplifier etc. is put into body together use.

DDS is the english abbreviation of Direct Digital Synthesizer (Direct Digital Synthesizer).Mainly comprise FREQUENCY CONTROL register, high-speed phase accumulator and three parts of sinusoidal calculations device (like Q2220) in the DDS chip.The FREQUENCY CONTROL register can serial or parallel mode load and deposit the FREQUENCY CONTROL sign indicating number of user's input; And that phase accumulator carries out in each clock cycle according to the FREQUENCY CONTROL sign indicating number is phase-accumulated, obtains a phase value; The sinusoidal calculations device then calculates digitized sine wave amplitude (chip generally obtains through tabling look-up) to this phase value.What the DDS chip was exported generally is digitized sine wave, and therefore also need pass through high-speed d/a transducer and low pass filter just can obtain an available analog frequency signal.Provide by national instrument company (NI).

The RS232 interface is the standard that is used for serial communication by EIA (EIA) associating Bell System, the common formulation of modulator-demodulator producer and terminal manufacturer in 1970.Its full name is " serial binary data exchange interface technical standard between data terminal equipment (DTE) and the data communications equipment (DCE) ".The DB25 connector of 25 pin is adopted in this standard code, and the signal content of each pin of connector is stipulated, also the level of various signals is stipulated.Along with updating of equipment, the DB9 interface of DB25 has appearred replacing, all be called DB9 to the RS232 interface now.

It is not enough that the airborne ADF aerial signal simulator that the utility model is realized has overcome conventional method, and have following advantage:

1. volume is little, compact conformation.The whole simulation device is a double flute VXI module, calculates with maximum limit, and its length * wide * height is respectively: 305mm * 233mm * 49mm.

2. easy accessibility is easy to integrated.The VXI module is positioned in the VXI cabinet, both can realize dismounting through push-and-pull.The more powerful system of other module composition functions that can be in the VXI cabinet.

3. simulator is program-controlled, can realize automatic test.The operating state of simulator can also can realize that the auto controlling simulation device sends signal through executive program, and then realize automatic test through the control simulator output signal that sends instructions manually through computer control.

4. the orientation stepping is little, and frequency covers complete.For the orientation that simulator produces, can realize stepping less than 1 degree, bearing range is 0 to 359 degree.The frequency of all ADF work can both be capped.

Description of drawings

Fig. 1 is the utility model structural representation.

Wherein, 1---digital receiver, 2---input data buffering interface, 3---computing module, 4---radio-frequency channel, 5---host computer, 6---RS232 interface, 7---DSP, 8---swap data buffer interface, 9---DDS modules.

Embodiment

The modular ADF aerial signal of a kind of VXI simulator; Form by input data buffering interface, computing module, swap data buffer interface, DDS module, radio-frequency channel, RS232 interface; Input data buffering interface concatenation operation module; Computing module connects swap data buffer interface, DDS module respectively, and the swap data buffer interface connects DSP, and the RS232 interface of the modular ADF aerial signal of VXI simulator connects DSP and host computer respectively; Computing module is in addition through radio-frequency channel output signal, and receiver connects input data buffering interface through ADC.

At first, the sin that sends of ADF receiver and cos two-way low frequency reference signal are through getting into the data buffering interface of FPGA after the ADC digitlization.FPGA receives the control command that host computer sends through serial ports, and transfers commands to DSP, and calculate information such as carrier wave, orientation by DSP and pass back to FPGA, and then DDS module and arithmetical operation module among the control FPGA, be accomplished to synthesizing of ADF aerial signal.The digital signal of synthetic output converts analog signal into through DAC, again output after the conditioning of radio-frequency channel.

DSP (digital signal processor) is a kind of microprocessor of uniqueness, is the device of handling bulk information with digital signal.Its operation principle is to receive analog signal, converts 0 or 1 digital signal into.Again digital signal is made amendment, deletes, strengthened, and in the other system chip, return analogue data or actual environment form to the numerical data decipher.

VXI module bus system or its subsystem are made up of a VXIbus mainframe box, plurality of V XIbus device, VXIbus explorer and master controller; Zero channel mould piece is accomplished the System Backplane management; Comprise clock source and core bus arbitration etc. are provided, it also can have other instrumental function simultaneously certainly.Explorer is configured system when system powers on or reset, so that system user can be since a definite state system operation.After system's operate as normal, explorer just no longer works.Mainframe box holds the VXIbus instrument, and for it communication backplane, power supply and cooling is provided.Five tame instrument companies such as HP, Tekronix have set up VXIbus association, and have issued first version of VXI standard in 1987.Several times modification and perfect was received to the IEEE-1155-1992 standard with 1992 by IEEE.

ADF is by antenna, receives the news machine, RMI (magnetic direction indicator: Rotary Magnetic Indicator) and controller form.Antenna then is to be made up of ring Shape antenna (Loop Antenna) and sense antenna (Sense Antenna).Can find out automatically transmit on the ground the sender that send news signal (continuous wave or the continuous wave that modifies tone with distinguished symbol) to action be called the ADF waveform; Be to use the signal of ring Shape antenna and sense antenna this time; If only need receive aphalangia to data and distinguished symbol, just single sense antenna (ANT waveform) that uses.The installation site of antenna is to be located at body upside or the rough centre of downside, and ring Shape antenna, sense antenna and quadrant error correction device and amplifier etc. is put into body together use.

DDS is the english abbreviation of Direct Digital Synthesizer (Direct Digital Synthesizer).Mainly comprise FREQUENCY CONTROL register, high-speed phase accumulator and three parts of sinusoidal calculations device (like Q2220) in the DDS chip.The FREQUENCY CONTROL register can serial or parallel mode load and deposit the FREQUENCY CONTROL sign indicating number of user's input; And that phase accumulator carries out in each clock cycle according to the FREQUENCY CONTROL sign indicating number is phase-accumulated, obtains a phase value; The sinusoidal calculations device then calculates digitized sine wave amplitude (chip generally obtains through tabling look-up) to this phase value.What the DDS chip was exported generally is digitized sine wave, and therefore also need pass through high-speed d/a transducer and low pass filter just can obtain an available analog frequency signal.Provide by national instrument company (NI).

The RS232 interface is the standard that is used for serial communication by EIA (EIA) associating Bell System, the common formulation of modulator-demodulator producer and terminal manufacturer in 1970.Its full name is " serial binary data exchange interface technical standard between data terminal equipment (DTE) and the data communications equipment (DCE) ".The DB25 connector of 25 pin is adopted in this standard code, and the signal content of each pin of connector is stipulated, also the level of various signals is stipulated.Along with updating of equipment, the DB9 interface of DB25 has appearred replacing, all be called DB9 to the RS232 interface now.

At first, the sin that sends of ADF receiver and cos two-way low frequency reference signal are through getting into the data buffering interface of FPGA after the ADC digitlization.FPGA receives the control command that host computer sends through serial ports, and transfers commands to DSP, and calculate information such as carrier wave, orientation by DSP and pass back to FPGA, and then DDS module and arithmetical operation module among the control FPGA, be accomplished to synthesizing of ADF aerial signal.The digital signal of synthetic output converts analog signal into through DAC, again output after the conditioning of radio-frequency channel.

Claims (1)

1. the modular ADF aerial signal of VXI simulator; Form by input data buffering interface, computing module, swap data buffer interface, DDS module, radio-frequency channel, RS232 interface; It is characterized in that: input data buffering interface concatenation operation module; Computing module connects swap data buffer interface, DDS module respectively, and the swap data buffer interface connects DSP, and the RS232 interface of the modular ADF aerial signal of VXI simulator connects DSP and host computer respectively; Computing module is in addition through radio-frequency channel output signal, and receiver connects input data buffering interface through ADC.

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