CN105333887B - Radio altimeter signal imitation system - Google Patents
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- CN105333887B CN105333887B CN201510669563.4A CN201510669563A CN105333887B CN 105333887 B CN105333887 B CN 105333887B CN 201510669563 A CN201510669563 A CN 201510669563A CN 105333887 B CN105333887 B CN 105333887B
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Abstract
The present invention relates to a kind of radio altimeter signal imitation system, comprising：Mathematical simulation computing subsystem, it emulates the model database required by generation simulated conditions, and conversion, management and the control of simulation process and the processing of implementation model database；Analogue echoes simulation subsystem, it is connected with mathematical simulation computing subsystem, receives model data and control instruction, the conversion and output of implementation model data to intermediate-freuqncy signal；Altimeter simulator, it is connected with analogue echoes simulation subsystem and mathematical simulation computing subsystem, simulates actual altimeter, to evaluate and test the simulation capacity of simulation system, realizes signal to the reversal of height value.The present invention has flexible, economic, true to nature and sophisticated functions simulation capacity, realize radio altimeter material object to the real-time Simulation operation of full working environment and verification experimental verification, support is provided for the testing experiment of radio altimeter, particularly navigation control system, assessment of performance.
Description
Technical field
The present invention relates to a kind of radio altimeter signal imitation system, belongs to radio HWIL simulation and experiment neck
Domain.
Background technology
Radio altimeter is elevation information test equipment important in many flight control systems, and its function is to fly
Row device is flat to fly, push section and hedgehopping process provides accurate elevation information for flight control system, is that aircraft is led
Boat is landed and flight control system realizes precision navigation, terrain match, the key equipment to land.
Due to radio altimeter working system, running parameter, working environment diversity so that radio altitude
The difficulty and complexity of table test, emulation and experiment greatly improve.
The special test equipment used at present is fixed test mostly, can only be one or several in the test height table course of work
Altimetry performance under individual height, it is impossible to performance of the Complete test altimeter in the overall process that works.And if hung using outfield
Experiment, then can be with the continuous altimetry performance of simulated altitude table, but the actual operating conditions of itself and altimeter have very big difference, together
When economy and repeatability it is also poor.
In currently used semi-matter simulating system, using high-speed DAC（Digital analog converter, Digital to
Analog Converter）The systematic comparison that chip carries out HWIL simulation is more.Such as paper《Based on the variable pulse thunder of configuration
Up to Hardware In The Loop Simulation Method》Described in, the signal to noise ratio for making echo-signal is limited by this method using high-speed DAC, while cost is high,
Signal quality is not high.And paper《Frequency modulation millimeter wave short-range radar HWIL simulation integrated test system research》Described in, this is
System uses DDS（Direct Digital Synthesizer, Direct Digital Synthesizer）Technology can only simulated target letter
Number, signal is excessively simple, it is impossible to shows the real electromagnetic environment in ground.In addition, paper《A kind of PD radars semi-matter simulating system
Research》Described in, the system exports after the echo-signal of reception simply is entered into line delay and Doppler modulation, can not realize ground
The inconsistency and RCS of the echo-signal delay of each scattering point in face（RCS, Radar Cross Section）No
Together, the echo shaping with reality differs larger, and the similitude of emulation is not high.
The content of the invention
It is an object of the invention to provide a kind of radio altimeter signal imitation system, to pass through software combination hardware shape
Into semi-matter simulating system, there is flexible, economic, true to nature and sophisticated functions simulation capacity, can conveniently realize radio height
Degree table matter emulation is difficult to the working environment emulation simulated, and realizes real-time Simulation of the radio altimeter material object to full working environment
Operation and verification experimental verification, it is that testing experiment, the assessment of performance of radio altimeter, particularly navigation control system provide support.
In order to achieve the above object, the present invention provides a kind of radio altimeter signal imitation system, comprising：Mathematical simulation
Computing subsystem, it emulates the model database required by generation simulated conditions, the implementation model database after emulation starts
Transmission and download, and conversion, management and the control of simulation process and the processing of implementation model database；Analogue echoes emulation
System, it is connected with described mathematical simulation computing subsystem, receives model data and the control of mathematical simulation computing subsystem
Instruction, the conversion and output of implementation model data to intermediate-freuqncy signal；Altimeter simulator, it emulates son with described analogue echoes
System and the connection of mathematical simulation computing subsystem, simulate actual altimeter, to evaluate and test the simulation capacity of simulation system, realize
Signal to height value reversal.
Described mathematical simulation computing subsystem includes：Hardware computing platform；Model computation module, it is arranged on described
In hardware computing platform；Simulation data base, it is arranged in described hardware computing platform, and with described model computation module
Connection, it is raw by computer sim- ulation with reference to l-G simulation test condition according to the control parameter of navigation system by model computation module
Into the echo model database needed for emulation；Simulation management module, it is arranged in described hardware computing platform, and with it is described
Simulation data base connection, according to each model library of emulation generation, and simulated conditions, the information of flight curve, realize half
The control of matter simulating system；Test data evaluation module, it is arranged in described hardware computing platform, and with described height
The connection of table simulator is spent, process data, contrast simulation flight curve, height table model are tested according to altimeter simulator after emulation
And other simulated conditions, analyze the measurement error of altimeter and the analogue simulation error of analogue system；Data communication interface
Card, it is arranged in described hardware computing platform, and is connected with described simulation data base, passes through the data communication interface card
Realize data transfer and the communication of hardware computing platform and analogue echoes simulation subsystem；Interface communication module, it is arranged on institute
In the hardware computing platform stated, the normal work of data communication interface card is realized.
Described echo model database includes ground model database, Sea Model database, interference model database,
Clutter Model database, noise model database, altimeter model database, flight curve mathematic model storehouse, and emulation prison
Model database is estimated in test and appraisal.
Described analogue echoes simulation subsystem includes：Real-time controlling unit, it controls analogue echoes simulation subsystem
Unit works in order；Communication unit, it is connected with described data communication interface card and real-time controlling unit respectively, receives
The model data and control instruction of the hardware computing platform output of mathematical simulation computing subsystem, and transmit to real-time controlling unit
Decomposition extraction is carried out to model data and control instruction；Memory cell, it is connected with described real-time controlling unit, stored by reality
When control unit decomposition extraction after model data and control instruction；Intermediate-freuqncy signal generation unit, itself and described real-time control
Unit is connected, and after emulation starts, the model data and control instruction stored in memory cell is successively read by real-time controlling unit,
And intermediate-freuqncy signal generation unit is controlled according to analog if signal corresponding to model data and control instruction generation；IF Modulation with
Synthesis unit, it is connected with described intermediate-freuqncy signal generation unit, the analog intermediate frequency that receiving intermediate frequency signal generation unit is generated
Signal is simultaneously synthesized, the generation of Doppler modulation and echo；The digital regulated unit of power output, its with described IF Modulation with
Synthesis unit connects, and receives the analog if signal after synthesis, and is exported after being adjusted to altimeter simulator.
Described intermediate-freuqncy signal generation unit includes：The extra large echo machine in multichannel ground, its respectively with described real-time control
Unit and IF Modulation are connected with synthesis unit, with generating intermediate frequency extra large echo-signal；Doppler unit equipment, its respectively with it is described
Real-time controlling unit and IF Modulation be connected with synthesis unit, generate ground scatter point intermediate frequency Doppler signal, according to height
Spend the Doppler frequency on the information output ground sea of table；Interference generator, its respectively with described real-time controlling unit and intermediate frequency
Modulation is connected with synthesis unit, and for the signal to noise ratio of with adjusting intermediate frequency extra large echo-signal, checking altimeter is under different signal to noise ratio
Altimetry performance.
Described analogue echoes simulation subsystem also includes：Display unit, it is connected with described real-time controlling unit, real
The real-time control of existing simulation process and the real-time display of procedural information；AC-DC power source combination equipment, itself and described real-time control
Unit connects, there is provided the operating voltage of the unit of analogue echoes simulation subsystem；Frequency synthesizer unit equipment, itself and described reality
When control unit connect, there is provided the work clock of the unit of analogue echoes simulation subsystem, realize the sequential of unit
It is synchronous.
When the Simulation of Echo Signal to altimeter is carried out in radio band, described analogue echoes simulation subsystem also includes
RF up-converter unit, it is connected with described IF Modulation with synthesis unit and the digital regulated unit of power output respectively, uses
So that the analog if signal after synthesis is converted into radiofrequency signal, output is to highly after the digital regulated unit regulation of power output
Table simulator.
Described altimeter simulator includes：Information processing unit equipment；Intermediate frequency unit equipment, comprising intermediate-frequency receiver,
It is connected with described information processing unit equipment, and the mould exported by the digital regulated unit of power output is received by reception antenna
Intend intermediate-freuqncy signal, and export to information processing unit equipment；IF modulator, it connects with described information processing unit equipment
Connect, receive the intermediate-freuqncy signal exported by the information processing unit equipment, the intermediate-freuqncy signal is sent to output work by transmitting antenna
The digital regulated unit of rate, using the synchronizing datum signal emulated as intermediate-freuqncy signal；Communication interface, its respectively with described information
Unit equipment and the connection of test data evaluation module are managed, information processing unit equipment is carried out to the analog if signal received
Processing is carried out the altitude signal by described communications interface transmission to test data evaluation module with extracting altitude signal
Analyzing and processing；Sequential DDS unit equipments, it is the control combination equipment of altimeter simulator, comprising SECO equipment, it is distinguished
It is connected with described information processing unit equipment and intermediate-frequency receiver, to control sequential relation, realizes that information processing is combined
The orderly work of equipment and intermediate-frequency receiver；Microwave frequency synthesizer equipment, its respectively with described information processing unit equipment and
IF modulator connects, to produce the IF Modulation local oscillation signal needed for IF modulator.
Described altimeter simulator also includes：Power source combination equipment, it is each with described altimeter simulator respectively
Individual equipment connection, there is provided the operating voltage of each equipment of altimeter simulator.
When the Simulation of Echo Signal to altimeter is carried out in radio band, described altimeter simulator also includes：Microwave
Unit equipment, it is connected with described intermediate frequency unit equipment, comprising：Microwave receiver, its with described intermediate-frequency receiver and
SECO equipment is connected, and SECO is carried out by SECO equipment, is received by reception antenna and is adjusted by power output numeral
The radiofrequency signal of unit output is saved, down-converted is carried out and changes to intermediate-freuqncy signal, and export to intermediate-frequency receiver；Microwave emission
Machine, it is connected with described IF modulator and microwave frequency synthesizer equipment, as the microwave modulation needed for IF modulator provides it
Local oscillation signal, and the intermediate-freuqncy signal exported by information processing unit equipment is received, carry out upconversion process and change to radiofrequency signal,
The radiofrequency signal is launched to RF up-converter unit via the digital regulated unit of power output by transmitting antenna, using as penetrating
The synchronizing datum signal of frequency signal simulation.
In summary, radio altimeter signal imitation system provided by the invention, have flexible, economical, true to nature and multiple
Miscellaneous functional simulation ability；It can conveniently realize that radio altimeter matter emulation is difficult to the working environment emulation simulated, realize nothing
Line electrical height table material object is radio altimeter, particularly navigated to the real-time Simulation operation of full working environment and verification experimental verification
The testing experiment of control system, assessment of performance provide support, greatly reduce the number of field trial, have economic well imitate
Benefit.
Brief description of the drawings
Fig. 1 is the structural representation of the radio altimeter signal imitation system in the present invention；
Fig. 2 is the structural representation of the mathematical simulation computing subsystem in the present invention；
Fig. 3 is the structural representation of the analogue echoes simulation subsystem in the present invention；
Fig. 4 is the structural representation of the altimeter simulator in the present invention.
Embodiment
Below in conjunction with Fig. 1~Fig. 4, a preferred embodiment of the present invention is described in detail.
As shown in figure 1, be radio altimeter signal imitation system provided by the invention, comprising：Mathematical simulation calculates son
System 100, it emulates the model database required by generation simulated conditions, the transmission of implementation model database after emulation starts
And download, and conversion, management and the control of simulation process and the processing of implementation model database；Analogue echoes simulation subsystem
200, it is connected with described mathematical simulation computing subsystem 100, and enters row information with navigation control system 400 and exchange, and receives
The model data and control instruction of mathematical simulation computing subsystem 100, the conversion and output of implementation model data to intermediate-freuqncy signal；
Wherein, the parameter such as the modulation system of the intermediate-freuqncy signal of output, amplitude is controlled completely by model database, realizes mould true to nature in real time
Intend output；Altimeter simulator 300, itself and described analogue echoes simulation subsystem 200 and mathematical simulation computing subsystem
100 connections, simulate actual altimeter, to evaluate and test the simulation capacity of simulation system, realize signal to the reversal of height value.
As shown in Fig. 2 described mathematical simulation computing subsystem 100 includes：Hardware computing platform 101, it uses high property
Energy computer is realized, carries out simulation management module using programming languages such as WindowsXP operating systems and VC++, model calculates
The exploitation of module and Related Mathematical Models；Model computation module 104, it is arranged in described hardware computing platform 101；It is imitative
True data storehouse 103, it is arranged in described hardware computing platform 101, and is connected with described model computation module 104, is led to
Model computation module 104 is crossed, it is imitative by computer sim- ulation, generation with reference to l-G simulation test condition according to the control parameter of navigation system
Very required echo model database；Simulation management module 105, it is arranged in described hardware computing platform 101, and with institute
The simulation data base 103 stated connects, real according to each model library of emulation generation, and the information such as simulated conditions, flight curve
The control of existing semi-matter simulating system；Test data evaluation module 106, it is arranged in described hardware computing platform 101, and
It is connected with described altimeter simulator 300, process data is tested according to altimeter simulator after emulation, contrast simulation flight is bent
Line, height table model and other simulated conditions, analyze the measurement error of altimeter and the analogue simulation error of analogue system
Deng so as to analyze altimetry performance, tracking performance and matching performance with navigation control system.
Wherein, described echo model database includes ground model database, Sea Model database, interference model number
According to storehouse, Clutter Model database, noise model database, altimeter model database, flight curve mathematic model storehouse, Yi Jifang
True monitoring and evaluation model database.
Described mathematical simulation computing subsystem 100 also includes：Data communication interface card 102, it is arranged on described hard
In part calculating platform 101, and it is connected with described simulation data base 103, hardware meter is realized by the data communication interface card 102
Calculate data transfer and the communication of platform 101 and analogue echoes simulation subsystem 200；Interface communication module 107, it is arranged on described
Hardware computing platform 101 in, realize the normal work of data communication interface card 102.
As shown in figure 3, described analogue echoes simulation subsystem 200 includes：Real-time controlling unit 203, it is echo mould
Intend the Central Control Module of simulation subsystem 200, to control the unit of analogue echoes simulation subsystem 200 to work in order；
Communication unit 202, it is connected with described data communication interface card 102 and real-time controlling unit 203 respectively, receives mathematical simulation
The model data and control instruction that the hardware computing platform 101 of computing subsystem 100 exports, and transmit to real-time controlling unit
203 pairs of model datas and control instruction carry out decomposition extraction；Memory cell 204, it connects with described real-time controlling unit 203
Connect, store and model data and control instruction after extraction are decomposed by real-time controlling unit 203；Intermediate-freuqncy signal generation unit, its with
Described real-time controlling unit 203 connects, and after startup is emulated, is successively read by real-time controlling unit 203 in memory cell 204
The model data and control instruction of storage, and control intermediate-freuqncy signal generation unit corresponding according to model data and control instruction generation
Analog if signal；IF Modulation and synthesis unit 210, it is connected with described intermediate-freuqncy signal generation unit, receives intermediate frequency
Analog if signal that signal generation unit is generated simultaneously is synthesized, the generation of Doppler modulation and echo, each analog intermediate frequency
Relative size between signal is controlled by real-time controlling unit 203 according to the requirement of model data and control instruction；Output work
The digital regulated unit 212 of rate, it is connected with described IF Modulation with synthesis unit 210, receives the analog intermediate frequency letter after synthesis
Number, and export the echo for determining output by the control word of real-time controlling unit 203 to altimeter simulator 300 after being adjusted
The amplitude size of analog if signal.
In the present embodiment, the digital regulated unit 212 of described power output uses the accurate numerical control power governor in broadband,
Realize that Larger Dynamic echo power is simulated.
Described intermediate-freuqncy signal generation unit includes：The extra large echo machine 207 in multichannel ground, its respectively with described real-time control
Unit 203 processed and IF Modulation are connected with synthesis unit 210, with generating intermediate frequency extra large echo-signal；Doppler unit equipment 208,
It is connected with described real-time controlling unit 203 and IF Modulation with synthesis unit 210 respectively, generates the intermediate frequency of ground scatter point
Doppler signal, the Doppler frequency on ground sea is exported according to the information of altimeter；Interference generator 209, its respectively with it is described
Real-time controlling unit 203 and IF Modulation be connected with synthesis unit 210, the noise for adjusting intermediate frequency extra large echo-signal
Than so as to verify altimetry performance of the altimeter under different signal to noise ratio.
Described multichannel extra large echo machine 207 include multi-block data bus mother board and hardware interface it is completely the same return
Wave simulation emulates subcard；Every piece of subcard uses high speed FPGA（Field-Programmable Gate Array, field-programmable
Gate array）Chip and DDS（Digital frequency synthesizer, Direct Digital Synthesizer）Integrated chip, 8 can be produced
The extra large echo-signal in road intermediate frequency ground.And analogue echoes emulation subcard quantity determine emulation after intermediate frequency extra large echo-signal son
The quantity of signal, so as to the abundant degree of with determining intermediate frequency extra large echo-signal.Because the hardware of analogue echoes emulation subcard connects
Mouth is completely the same with data/address bus bottom plate, can flexibly realize exchange.And intermediate frequency extra large echo-signal difference, be by each echo mould
Intend the different decisions of the control word of emulation subcard.
Described analogue echoes simulation subsystem 200 also includes display unit 201, itself and described real-time controlling unit
203 connections, real-time control and the real-time display of procedural information of simulation process are realized, for man-machine interaction, so as to more directly perceived bright
The monitoring of realizing simulation process.
Described analogue echoes simulation subsystem 200 also includes AC-DC（AC-DC）Power source combination equipment 205, its with
Described real-time controlling unit 203 connects, there is provided the operating voltage of the unit of analogue echoes simulation subsystem 200, realizes
The normal work of unit；Frequency synthesizer unit equipment 206, it is connected with described real-time controlling unit 203, there is provided analogue echoes
The work clock of the unit of simulation subsystem 200, realize the timing synchronization of unit.
In the present embodiment, described AC-DC power source combinations equipment 205 includes：AC-DC module, DC-DC module and power supply
Monitoring and protecting circuit, control display module and input/output interface etc., there is provided needed for analogue echoes simulation subsystem 200 works
Each specification power supply.
In the present embodiment, described frequency synthesizer unit equipment 206 provides system multi-channel analog subsystem work clock and is
System grandmaster clock, all clocks are synchronous with external clock.
Described analogue echoes simulation subsystem 200 also includes RF up-converter unit 211, its respectively with described intermediate frequency
Modulation is connected with synthesis unit 210 and the digital regulated unit 212 of power output.The RF up-converter unit 211 is one alternative
Unit, choose whether to use according to the actual demand of emulation.When the feelings that the Simulation of Echo Signal to altimeter is carried out in radio band
Under condition, now need the analog if signal after synthesis generating radiofrequency signal by RF up-converter unit 211, through output work
After the digital regulated unit 212 of rate is adjusted, realized by empty feedback system and transmitted with the signal of altimeter simulator 300.When to height
The Simulation of Echo Signal of table is in the case where Mid Frequency is carried out, and the analog if signal after now synthesizing is then without by radio frequency
Converter unit 211, it can directly be realized by line feedback system and be transmitted with the signal of altimeter simulator 300.
As shown in figure 4, described altimeter simulator 300 includes：Information processing unit equipment 301；Intermediate frequency unit equipment
303, comprising intermediate-frequency receiver 331, it is connected with described information processing unit equipment 301, is received by reception antenna by defeated
Go out the analog if signal that the digital regulated unit 212 of power exports, and export to information processing unit equipment 301；IF Modulation
Device 332, it is connected with described information processing unit equipment 301, receives the intermediate frequency exported by the information processing unit equipment 301
Signal, the intermediate-freuqncy signal is sent to the digital regulated unit 212 of power output by transmitting antenna, using what is emulated as intermediate-freuqncy signal
Synchronizing datum signal；Communication interface 306, it assesses mould with described information processing unit equipment 301 and test data respectively
Block 106 is connected, and information processing unit equipment 301 is handled the analog if signal received to extract altitude signal, and
The altitude signal is transmitted to test data evaluation module 106 by described communication interface 306 and analyzed and processed；Sequential
DDS unit equipments 302, be the control combination equipment of altimeter simulator, comprising SECO equipment 321, its respectively with it is described
Information processing unit equipment 301 and intermediate-frequency receiver 331 connect, to control sequential relation, realize that information processing is combined
The orderly work of equipment 301 and intermediate-frequency receiver 331；Microwave frequency synthesizer equipment 322, it is combined with described information processing respectively
Equipment 301 and IF modulator 332 connect, and to produce the IF Modulation local oscillation signal needed for IF modulator 332, meet
Survey high need.
Described altimeter simulator 300 also includes：Power source combination equipment 305, it is equivalent with described altimeter respectively
Each equipment connection of device 300, there is provided the operating voltage of each equipment of altimeter simulator 300, realizing each equipment just
Often work.
Described altimeter simulator 300 also includes：Microwave combination equipment 304, itself and described intermediate frequency unit equipment 303
Connection.The microwave combination equipment 304 is an alternative unit, identical with the RF up-converter unit 211 of the foregoing description, its basis
The actual demand of emulation chooses whether to use.When to the Simulation of Echo Signal of altimeter Mid Frequency carry out in the case of, now
Without using microwave combination equipment 304.When to the Simulation of Echo Signal of altimeter radio band carry out in the case of, now except
Outside RF up-converter unit 211, then also need to matching and use microwave combination equipment 304, comprising：Microwave receiver 341, itself and institute
The intermediate-frequency receiver 331 and SECO equipment 321 stated connect, and SECO are carried out by SECO equipment 321, by connecing
Receive antenna and receive the radiofrequency signal exported by the digital regulated unit 212 of power output, carry out down-converted and change to intermediate frequency letter
Number, and export to intermediate-frequency receiver 331；Microwave transmitter 342, it sets with described IF modulator 332 and microwave frequency synthesizer
Standby 322 connection, local oscillation signal is modulated as the microwave needed for IF modulator 332 provides it, and receive to be combined by information processing and set
The intermediate-freuqncy signals of standby 301 output, carry out upconversion process and change to radiofrequency signal, by transmitting antenna by the radiofrequency signal via
The digital regulated unit 212 of power output is launched to RF up-converter unit 211, using the synchronous base letter emulated as radiofrequency signal
Number.
In the present embodiment, the major parameter index of radio altimeter signal imitation system has：
1st, analogue echoes mode：Line feedback is pouring-in after echo synthesis；
2nd, altimeter system is adapted to：Pulse-frequency modulation, frequency modulation compression etc.；
3rd, the ground sea type adapted to：0~5 grade of sea condition etc., level land, hills etc.；
4th, analogue echo bandwidth：≥240MHz；
5th, analogue echo synchronization accuracy：≤3ns；
6th, analogue echo distance range：2m~60km；
7th, analogue echo delay precision：
Below 300m：≤2ns；
More than 300m：One thousandth；
8th, extra large scattering point is apart from grid quantized value：
More than 5km：≤ one thousandth；
2~5km：≤4m；
1000m~2000m：≤2.5m；
100m~1000m：≤1.25m；
2m~100m：≤0.25m；
9th, analogue echo power bracket：
Intermediate frequency：- 50dBm~10dBm；
Simulate signal to noise ratio feature：5dB~30dB, noise bandwidth 300MHz；
10th, echo Doppler scope：0Hz~200kKz；
11st, single analogue echoes duration：≥10min；
12nd, echo model precision：
Relative velocity precision：≤1m/s；
Altimeter antenna radiation pattern precision：≤0.2°；
Posture angular accuracy：≤0.5°；
Ground sea scattering model precision：≥90%；
13rd, analogue echoes dutycycle：≤1/2；
14th, extra large analogue echoes port number：1 passage；
15th, echo model data download time：≤10min；
16th, the analog echo signal output response time：≤5ms；
17th, the signal response time of access control system closed-loop simulation：≤10ms.
Radio altimeter signal imitation system provided by the invention, pass through the hardware platform of versatility, navigation system
The simulation requirements of system and different flight curves, combined ground echo model storehouse, sea return model library, altimeter model library etc.
Data model, controlled by software, be converted into actual echo signal of intermediate frequency in simulation subsystem implementation model data, the signal
Through synthesizing with after amplitude modulation(PAM), the measurement and output of height are realized by altimeter simulator, it is achieved thereby that elevation carrection closes
Ring test.
Compared with prior art, radio altimeter signal imitation system provided by the invention, there is advantages below and have
Beneficial effect：
1st, the semi-matter simulating system that the present invention is formed for software with combination of hardware, have flexible, economical, true to nature and complicated
Functional simulation ability, for different environmental conditions, different flight curves and different altimeter types are corresponding by changing
Simulation model library, just can flexibly realize it is new under conditions of altimeter service behaviour test.
2nd, the present invention can conveniently realize that radio altimeter matter emulation is difficult to the working environment emulation simulated, and realize nothing
Line electrical height table is particularly controlled for aircraft radio altimeter the real-time Simulation operation of full working environment and verification experimental verification
The testing experiment of system, assessment of performance provide support.And common altimeter test equipment can only test height table function it is special
Property, service behaviour of the altimeter in flight course can not be detected.
3rd, the present invention has great advantage in terms of economy and versatility, based on general purpose hardware Platform Designing, uses
Software realizes the simulation of various varying environments, Validity Test altimeter work overall process altimetry performance, test it is comprehensive,
Diversity and repeatability can ensure completely, greatly reduce the number of field trial, have preferable economy.
Although present disclosure is discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read the above, for the present invention's
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (9)
1. a kind of radio altimeter signal imitation system, it is characterised in that include：
Mathematical simulation computing subsystem（100）, it emulates the model database required by generation simulated conditions, after emulation starts
The transmission and download of implementation model database, and the conversion of implementation model database, management and the control of simulation process and place
Reason；
Analogue echoes simulation subsystem（200）, itself and described mathematical simulation computing subsystem（100）Connection, receive mathematics and imitate
True computing subsystem（100）Model data and control instruction, the conversion and output of implementation model data to intermediate-freuqncy signal；
Altimeter simulator（300）, itself and described analogue echoes simulation subsystem（200）And mathematical simulation computing subsystem
（100）Connection, simulates actual altimeter, to evaluate and test the simulation capacity of simulation system, realizes signal to the reversal of height value；
Wherein, described mathematical simulation computing subsystem（100）Comprising：
Hardware computing platform（101）；
Model computation module（104）, it is arranged on described hardware computing platform（101）It is interior；
Simulation data base（103）, it is arranged on described hardware computing platform（101）It is interior, and with described model computation module
（104）Connection, passes through model computation module（104）, according to the control parameter of navigation system, with reference to l-G simulation test condition, pass through
Computer sim- ulation, the echo model database needed for generation emulation；
Simulation management module（105）, it is arranged on described hardware computing platform（101）It is interior, and with described simulation data base
（103）Connection, according to each model library of emulation generation, and simulated conditions, the information of flight curve, realize HWIL simulation
The control of system；
Test data evaluation module（106）, it is arranged on described hardware computing platform（101）It is interior, and with described altimeter
Simulator（300）Connection, process data, contrast simulation flight curve, altimeter mould are tested according to altimeter simulator after emulation
Type and other simulated conditions, analyze the measurement error of altimeter and the analogue simulation error of analogue system；
Data communication interface card（102）, it is arranged on described hardware computing platform（101）It is interior, and with described emulation data
Storehouse（103）Connection, passes through the data communication interface card（102）Realize hardware computing platform（101）Subsystem is emulated with analogue echoes
System（200）Data transfer and communication；
Interface communication module（107）, it is arranged on described hardware computing platform（101）It is interior, realize data communication interface card
（102）Normal work.
2. radio altimeter signal imitation system as claimed in claim 1, it is characterised in that described echo model data
Storehouse includes ground model database, Sea Model database, interference model database, Clutter Model database, noise model number
According to storehouse, altimeter model database, flight curve mathematic model storehouse, and emulation monitoring and evaluation model database.
3. radio altimeter signal imitation system as claimed in claim 1, it is characterised in that described analogue echoes emulation
Subsystem（200）Comprising：
Real-time controlling unit（203）, it controls analogue echoes simulation subsystem（200）Unit work in order；
Communication unit（202）, its respectively with described data communication interface card（102）And real-time controlling unit（203）Connection, connects
Receive mathematical simulation computing subsystem（100）Hardware computing platform（101）The model data and control instruction of output, and transmit to
Real-time controlling unit（203）Decomposition extraction is carried out to model data and control instruction；
Memory cell（204）, itself and described real-time controlling unit（203）Connection, is stored by real-time controlling unit（203）Decompose
Model data and control instruction after extraction；
Intermediate-freuqncy signal generation unit, itself and described real-time controlling unit（203）Connection, it is single by control in real time after emulation starts
Member（203）It is successively read memory cell（204）The model data and control instruction of middle storage, and control intermediate-freuqncy signal generation unit
According to analog if signal corresponding to model data and control instruction generation；
IF Modulation and synthesis unit（210）, it is connected with described intermediate-freuqncy signal generation unit, and receiving intermediate frequency signal generation is single
First analog if signal generated is simultaneously synthesized, the generation of Doppler modulation and echo；
The digital regulated unit of power output（212）, itself and described IF Modulation and synthesis unit（210）Connection, receive synthesis
Analog if signal afterwards, and exported after being adjusted to altimeter simulator（300）.
4. radio altimeter signal imitation system as claimed in claim 3, it is characterised in that described intermediate-freuqncy signal generation
Unit includes：
The extra large echo machine in multichannel ground（207）, its respectively with described real-time controlling unit（203）It is single with synthesis with IF Modulation
Member（210）Connect, with generating intermediate frequency extra large echo-signal；
Doppler's unit equipment（208）, its respectively with described real-time controlling unit（203）With IF Modulation and synthesis unit
（210）Connection, the intermediate frequency Doppler signal of ground scatter point is generated, Doppler's frequency on ground sea is exported according to the information of altimeter
Rate；
Interference generator（209）, its respectively with described real-time controlling unit（203）With IF Modulation and synthesis unit（210）
Connection, for the signal to noise ratio of with adjusting intermediate frequency extra large echo-signal, altimetry performance of the checking altimeter under different signal to noise ratio.
5. radio altimeter signal imitation system as claimed in claim 3, it is characterised in that described analogue echoes emulation
Subsystem（200）Also include：
Display unit（201）, itself and described real-time controlling unit（203）Connection, realize real-time control and the mistake of simulation process
The real-time display of journey information；
AC-DC power source combination equipment（205）, itself and described real-time controlling unit（203）Connection, there is provided analogue echoes emulation
System（200）Unit operating voltage；
Frequency synthesizer unit equipment（206）, itself and described real-time controlling unit（203）Connection, there is provided analogue echoes simulation subsystem
（200）Unit work clock, realize the timing synchronization of unit.
6. radio altimeter signal imitation system as claimed in claim 3, it is characterised in that described altimeter simulator
（300）Comprising：
Information processing unit equipment（301）；
Intermediate frequency unit equipment（303）, include intermediate-frequency receiver（331）, itself and described information processing unit equipment（301）Even
Connect, received by reception antenna by the digital regulated unit of power output（212）The analog if signal of output, and export to information
Handle unit equipment（301）；IF modulator（332）, itself and described information processing unit equipment（301）Connection, receive by
The information processing unit equipment（301）The intermediate-freuqncy signal of output, the intermediate-freuqncy signal is sent to power output number by transmitting antenna
Regulation unit（212）, using the synchronizing datum signal emulated as intermediate-freuqncy signal；
Communication interface（306）, its respectively with described information processing unit equipment（301）And test data evaluation module
（106）Connection, information processing unit equipment（301）The analog if signal received is handled to extract altitude signal,
And the altitude signal is passed through into described communication interface（306）Transmit to test data evaluation module（106）Analyzed and processed；
Sequential DDS unit equipments（302）, be altimeter simulator control combination equipment, include SECO equipment（321）,
Its respectively with described information processing unit equipment（301）And intermediate-frequency receiver（331）Connection, to control sequential relation,
Realize information processing unit equipment（301）And intermediate-frequency receiver（331）Orderly work；Microwave frequency synthesizer equipment（322）, its point
Not with described information processing unit equipment（301）And IF modulator（332）Connection, to produce IF modulator
（332）Required IF Modulation local oscillation signal.
7. radio altimeter signal imitation system as claimed in claim 6, it is characterised in that described altimeter simulator
（300）Also include：Power source combination equipment（305）, its respectively with described altimeter simulator（300）Each equipment connection,
Altimeter simulator is provided（300）Each equipment operating voltage.
8. radio altimeter signal imitation system as claimed in claim 6, it is characterised in that when to the echo letter of altimeter
Number emulation when radio band is carried out, described analogue echoes simulation subsystem（200）Also include RF up-converter unit（211）,
Its respectively with described IF Modulation and synthesis unit（210）With the digital regulated unit of power output（212）Connection, that will close
Analog if signal after is converted into radiofrequency signal, through the digital regulated unit of power output（212）Output is to highly after regulation
Table simulator（300）.
9. radio altimeter signal imitation system as claimed in claim 8, it is characterised in that described altimeter simulator
（300）Also include：
Microwave combination equipment（304）, itself and described intermediate frequency unit equipment（303）Connection, comprising：Microwave receiver（341）, its
With described intermediate-frequency receiver（331）And SECO equipment（321）Connection, by SECO equipment（321）Carry out sequential
Control, received by reception antenna by the digital regulated unit of power output（212）The radiofrequency signal of output, carry out down-converted
Conversion is exported to intermediate-frequency receiver to intermediate-freuqncy signal（331）；Microwave transmitter（342）, itself and described IF modulator
（332）And microwave frequency synthesizer equipment（322）Connection, by IF modulator（332）Microwave modulation local oscillation signal needed for it is provided,
And receive by information processing unit equipment（301）The intermediate-freuqncy signal of output, carry out upconversion process and change to radiofrequency signal, pass through
Transmitting antenna is by the radiofrequency signal via the digital regulated unit of power output（212）Launch to RF up-converter unit（211）, with
Synchronizing datum signal as radiofrequency signal emulation.
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| CN106289316B (en) * | 2016-07-14 | 2018-12-18 | 电子科技大学 | A kind of continuous wave radio altimeter test device |
| CN106254009B (en) * | 2016-07-21 | 2018-08-03 | 北京航空航天大学 | A kind of Unmanned Aerial Vehicle Data Link test electromagnetic interference signal recurrence system and reproducing method |
| CN106407585B (en) * | 2016-09-28 | 2019-07-02 | Oppo广东移动通信有限公司 | The method and apparatus for tuning or optimizing in radio frequency simulation |
| CN106991001B (en) * | 2017-04-05 | 2020-09-15 | 中国航空无线电电子研究所 | Radio navigation identification simulation system |
| CN107894718A (en) * | 2017-11-08 | 2018-04-10 | 江西洪都航空工业集团有限责任公司 | A kind of radio signal processing system and method based on phaselocked loop |
| CN109656230B (en) * | 2018-12-16 | 2021-12-07 | 湖北航天飞行器研究所 | Aircraft simulated flight testing method |
| CN109992897B (en) * | 2019-04-03 | 2022-11-22 | 西安飞机工业（集团）有限责任公司 | Radio altimeter simulation method for ground proximity warning equipment |
| CN112255597B (en) * | 2020-09-28 | 2022-10-11 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Method for controlling radiation power of airborne radar altimeter |
| CN112284329A (en) * | 2020-10-22 | 2021-01-29 | 中国空间技术研究院 | Ground experiment system for correlation measurement of X-ray intensity at pulsar angular position |
| CN112558495B (en) * | 2020-11-27 | 2022-04-22 | 中国人民解放军火箭军工程大学 | Anti-interference semi-physical simulation system and method for radar altimeter |
| CN112929055B (en) * | 2021-01-19 | 2022-12-27 | 北京集睿致远科技有限公司 | Echo cancellation circuit |
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