CN104101865A - Doppler frequency shift simulation method and device based on general medium frequency transceiver - Google Patents
Doppler frequency shift simulation method and device based on general medium frequency transceiver Download PDFInfo
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- CN104101865A CN104101865A CN201410281190.9A CN201410281190A CN104101865A CN 104101865 A CN104101865 A CN 104101865A CN 201410281190 A CN201410281190 A CN 201410281190A CN 104101865 A CN104101865 A CN 104101865A
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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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
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- Computer Networks & Wireless Communication (AREA)
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- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses a doppler frequency shift simulation method and device based on a general medium frequency transceiver. The method comprises the steps that A, an audio generation collector acquires a radar mode; B, frequency shift amount is calculated through preset speed and the radar mode; C, the reference frequency of a doppler radar is received and filtering is carried out after down conversion; D, up conversion is carried out on a filtered signal, so as to generate a signal after frequency shift; and E, the signal is sent to the doppler radar and is compared with a reference signal. According to the invention, based on the medium frequency transceiver in the existing general PXI modular instrument, the total frequency shift amount is calculated through the acquired radar mode and the preset speed; up and down conversion and digital filtering are carried out on the signal to simulate doppler frequency shift; a high requirement on a special hardware circuit in the traditional technology is solved; the precision and the portability are improved; the repair time and the cost are reduced; and the doppler frequency shift simulation method and device based on the general medium frequency transceiver can be widely applied to the technical field of aviation.
Description
Technical field
The present invention relates to aeronautical technology field, especially a kind of Simulation Doppler Frequency-Shift method and apparatus based on general medium-frequency receiving and sending machine.
Background technology
The development of aeronautical technology, needs airborne equipment to safeguard and also will get caught up in paces, and traditional Doppler shift testing apparatus is to adopt single-sideband modulation to realize mostly.In this way realize Doppler shift testing apparatus need the hardware circuit of design specialized, to wave filter require high, frequency accuracy is not high, software transportability is poor and hardware-software be all not easy to upgrading.
Existing traditional Doppler carrier shift emulator adopts single-sideband modulation to realize frequency displacement, mostly being hardware mode realizes, to wave filter require high, software transportability is poor like this, also be not easy to upgrading, once break down, need to keep in repair whole hardware circuit board, maintenance cycle is long, in the short time, cannot recover normal work.
Summary of the invention
In order to solve the problems of the technologies described above, the object of the invention is: a kind of Simulation Doppler Frequency-Shift method that high precision, maintenance cycle are short, software transportability is good based on general medium-frequency receiving and sending machine is provided.
In order to solve the problems of the technologies described above, another object of the present invention is: a kind of Simulation Doppler Frequency-Shift device that high precision, maintenance cycle are short, software transportability is good based on general medium-frequency receiving and sending machine is provided.
The technical solution adopted in the present invention is: a kind of Simulation Doppler Frequency-Shift method based on general medium-frequency receiving and sending machine, includes following steps:
A, gather the radar mode of radar Doppler by audio frequency generation collector;
B, calculate total frequency shift amount by default speed and above-mentioned radar mode;
The reference frequency signal of C, reception radar Doppler, will carry out filtering in conjunction with the first local oscillation signal after reference frequency signal down coversion;
D, in conjunction with the second local oscillation signal by above-mentioned filtered signal up-conversion, produce the signal after frequency displacement;
E, the signal after above-mentioned frequency displacement is sent to radar Doppler, and contrasts with reference signal.
Further, described default speed includes course speed, side velocity and vertical speed.
Further, described the second local oscillation signal is that the side-play amount that the first local oscillation signal adds in the above step B forms.
What further, in described step C, use is FIR low-pass filter.
Another technical scheme of the present invention is: a kind of Simulation Doppler Frequency-Shift device based on general medium-frequency receiving and sending machine, include radio frequency load module, radio frequency output module, medium-frequency receiving and sending machine, audio frequency generation collector, speed arranges module and frequency shift amount computing module, the output terminal that the output terminal of described audio frequency generation collector and speed arrange module is all connected to the input end of frequency shift amount computing module, the output terminal of described frequency shift amount computing module is connected to the input end of medium-frequency receiving and sending machine, the output terminal of described radio frequency load module is connected to the reference signal input end of medium-frequency receiving and sending machine, the output terminal of described medium-frequency receiving and sending machine is connected to the input end of radio frequency output module.
Further, described audio frequency generation collector also includes the first audio frequency measurement module for measuring signal after radar Doppler and for measuring the second audio frequency measurement module of radar Doppler left signal.
Further, described medium-frequency receiving and sending machine includes low-converter, wave filter, upconverter and local oscillation signal generation module, the output terminal of described radio frequency load module is connected to the input end of radio frequency output module successively by low-converter, wave filter and upconverter, the local oscillation signal output terminal of described low-converter and the output terminal of frequency shift amount computing module are all connected to the input end of local oscillation signal generation module, and described local oscillation signal generation module is for generation of the local oscillation signal of upconverter.
Further, described wave filter is FIR wave filter.
Further, described speed arranges module for course speed, side velocity and vertical speed are set.
Further, described medium-frequency receiving and sending machine is realized based on general PXI modular instrument.
The invention has the beneficial effects as follows: this method is based on existing general PXI modular instrument medium-frequency receiving and sending machine, radar mode and default velograph by the radar Doppler that collects calculate total frequency shift amount, thereby then signal is carried out to Up/Down Conversion and realize simulation Doppler shift, avoid in conventional art special hardware circuit and the high request of wave filter, not only improve precision, also strengthened transplantability simultaneously and reduced servicing time and cost.
Another beneficial effect of the present invention is: this device is based on existing general PXI modular instrument medium-frequency receiving and sending machine, radar mode and default velograph by the radar Doppler that collects calculate total frequency shift amount, thereby then signal is carried out to Up/Down Conversion and utilize FPGA digital filtering to realize simulation Doppler shift, avoid in conventional art special hardware circuit and the high request of wave filter, not only improve precision, also strengthened transplantability simultaneously and reduced servicing time and cost.
Brief description of the drawings
Fig. 1 is the process flow diagram of the inventive method;
Fig. 2 is the principle of work schematic diagram of apparatus of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further:
With reference to Fig. 1, the process flow diagram of the inventive method, is mainly divided into five steps:
A, gather the radar mode of radar Doppler by audio frequency generation collector
Radar Doppler sends the signal of rear signal (BACK), left signal (LEFT) two-way decision radar mode (form (BACK, LEFT) of pattern), two paths of signals is certain low and high level signal of cycle, Doppler carrier shift emulator is (0 by audio frequency generation collector deterministic model, 0), (0,1), (1,0) or (1,1).
B, calculate total frequency shift amount by default speed and above-mentioned radar mode
First, the speed of the course of the aircraft that setting will be simulated, side direction and vertical three directions receives the mode signal that now radar Doppler sends simultaneously, goes out total frequency shift amount by course speed, side velocity, vertical speed and mode computation.Concrete computing formula is as follows:
FA＝Kx*Vx+Ky*Vy-Kz*Vz
FB＝Kx*Vx-Ky*Vy-Kz*Vz
FC＝-Kx*Vx-Ky*Vy-Kz*Vz
FD＝-Kx*Vx+Ky*Vy-Kz*Vz
Wherein:
FA is total frequency shift (FS) of front right (0,0) wave beam;
FB is total frequency shift (FS) of front left (0,1) wave beam;
FC is total frequency shift (FS) of rear left (1,1) wave beam;
FD is total frequency shift (FS) of rear right (1,0) wave beam;
Vx is course speed;
Vy is side velocity;
Vz is vertical speed;
The coefficient of the frequency shift (FS) that Kx produces for course speed;
The coefficient of the frequency shift (FS) that Ky produces for side velocity;
The coefficient of the frequency shift (FS) that Kz produces for vertical speed.
The reference frequency signal of C, reception radar Doppler, will carry out filtering in conjunction with the first local oscillation signal after reference frequency signal down coversion
Radar Doppler transmitting reference signal, Doppler carrier shift emulator receives reference signal and is made as cos (wt), the first local oscillation signal is set and produces two paths of signals cos (w
ct), sin (w
ct) multiply each other with reference signal:
By FIR low-pass filter is set, filters one of them frequency and leave cos ((w
c-w) t), sin ((w
c-w) t) two paths of signals.
D, in conjunction with the second local oscillation signal by above-mentioned filtered signal up-conversion, produce the signal after frequency displacement
The second local oscillation signal will produce two paths of signals cos (w
c+ Ω) t), sin ((w
c+ Ω) t), wherein Ω is the angular frequency that total frequency shift amount produces, the signal multiplication of two paths of signals and the output of FIR low-pass filter is added again:
cos(w
c-w)t)cos((w
c+Ω)t)+sin((w
c-w)t)sin((w
c+Ω)t)＝cos((w+Ω)t)
E, the signal after above-mentioned frequency displacement is sent to radar Doppler, and contrasts with reference signal
((w+ Ω) be the known frequency translation of having realized t) for signal cos after benchmark signal cos (wt) and output frequency displacement.Radar Doppler is by receiving the signal after frequency displacement, and with the reference signal comparison of sending, can calculate the speed of three directions.
With reference to Fig. 2, the workflow of apparatus of the present invention is described:
First, signal (BACK) and left signal (LEFT) two paths of signals after the collection of audio frequency generation collector, determine the mode of operation of radar Doppler, frequency shift amount computing module obtains above-mentioned mode of operation and speed and module set course speed, side velocity, vertical speed are set calculate total frequency shift amount; Medium-frequency receiving and sending machine receives reference signal by radio frequency load module, produces two paths of signals, and filter one of them frequency by FIR low-pass filter by low-converter by the first local oscillation signal; Local oscillation signal generation module produces the second local oscillation signal in conjunction with the first local oscillation signal and total frequency shift amount simultaneously, above-mentioned filtered signal produces a simulating signal by up-conversion by the second local oscillation signal, this simulating signal and reference signal relatively can be calculated to the speed of three directions.
The present invention is based on existing general PXI modular instrument, programming realizes radio frequency load module, radio frequency output module, medium-frequency receiving and sending machine, audio frequency generation collector, speed arranges module and frequency shift amount computing module, describe from above-mentioned workflow, the radar mode of the radar Doppler collecting by PXI modular instrument and default velograph calculate total frequency shift amount, thereby then signal is carried out to Up/Down Conversion and utilize FPGA digital filtering to realize simulation Doppler shift, avoid in conventional art special hardware circuit and the high request of wave filter, not only improve precision, also strengthened transplantability and reduced servicing time and cost simultaneously.
More than that better enforcement of the present invention is illustrated, but the invention is not limited to described embodiment, those of ordinary skill in the art can also make all equivalents or replacement under the prerequisite without prejudice to spirit of the present invention, and the distortion that these are equal to or replacement are all included in the application's claim limited range.
Claims (10)
1. the Simulation Doppler Frequency-Shift method based on general medium-frequency receiving and sending machine, is characterized in that: include following steps:
A, gather the radar mode of radar Doppler by audio frequency generation collector;
B, calculate total frequency shift amount by default speed and above-mentioned radar mode;
The reference frequency signal of C, reception radar Doppler, will carry out filtering in conjunction with the first local oscillation signal after reference frequency signal down coversion;
D, in conjunction with the second local oscillation signal by above-mentioned filtered signal up-conversion, produce the signal after frequency displacement;
E, the signal after above-mentioned frequency displacement is sent to radar Doppler, and contrasts with reference signal.
2. a kind of Simulation Doppler Frequency-Shift method based on general medium-frequency receiving and sending machine according to claim 1, is characterized in that: described default speed includes course speed, side velocity and vertical speed.
3. a kind of Simulation Doppler Frequency-Shift method based on general medium-frequency receiving and sending machine according to claim 1, is characterized in that: described the second local oscillation signal is that the side-play amount that the first local oscillation signal adds in the above step B forms.
4. a kind of Simulation Doppler Frequency-Shift method based on general medium-frequency receiving and sending machine according to claim 1, is characterized in that: what in described step C, use is FIR low-pass filter.
5. the Simulation Doppler Frequency-Shift device based on general medium-frequency receiving and sending machine, it is characterized in that: include radio frequency load module, radio frequency output module, medium-frequency receiving and sending machine, audio frequency generation collector, speed arranges module and frequency shift amount computing module, the output terminal that the output terminal of described audio frequency generation collector and speed arrange module is all connected to the input end of frequency shift amount computing module, the output terminal of described frequency shift amount computing module is connected to the input end of medium-frequency receiving and sending machine, the output terminal of described radio frequency load module is connected to the reference signal input end of medium-frequency receiving and sending machine, the output terminal of described medium-frequency receiving and sending machine is connected to the input end of radio frequency output module.
6. a kind of Simulation Doppler Frequency-Shift device based on general medium-frequency receiving and sending machine according to claim 5, is characterized in that: described audio frequency generation collector also includes the first audio frequency measurement module for measuring signal after radar Doppler and for measuring the second audio frequency measurement module of radar Doppler left signal.
7. a kind of Simulation Doppler Frequency-Shift device based on general medium-frequency receiving and sending machine according to claim 5, it is characterized in that: described medium-frequency receiving and sending machine includes low-converter, wave filter, upconverter and local oscillation signal generation module, the output terminal of described radio frequency load module passes through low-converter successively, wave filter and upconverter are connected to the input end of radio frequency output module, the local oscillation signal output terminal of described low-converter and the output terminal of frequency shift amount computing module are all connected to the input end of local oscillation signal generation module, described local oscillation signal generation module is for generation of the local oscillation signal of upconverter.
8. a kind of Simulation Doppler Frequency-Shift device based on general medium-frequency receiving and sending machine according to claim 7, is characterized in that: described wave filter is FIR wave filter.
9. a kind of Simulation Doppler Frequency-Shift device based on general medium-frequency receiving and sending machine according to claim 5, is characterized in that: described speed arranges module for course speed, side velocity and vertical speed are set.
10. a kind of Simulation Doppler Frequency-Shift device based on general medium-frequency receiving and sending machine according to claim 5, is characterized in that: described medium-frequency receiving and sending machine is realized based on general PXI modular instrument.
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Cited By (3)
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| CN104122537A (en) * | 2014-08-08 | 2014-10-29 | 广州航新航空科技股份有限公司 | Doppler frequency shift simulator and Doppler frequency shift simulating method |
| CN105572656A (en) * | 2015-12-25 | 2016-05-11 | 中国船舶重工集团公司七五〇试验场 | Doppler frequency shift simulator with dynamic underwater acoustic target echo simulation and simulation method |
| CN110095760A (en) * | 2019-04-24 | 2019-08-06 | 中国气象局气象探测中心 | A kind of test device and method of weather radar |
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| CN105572656A (en) * | 2015-12-25 | 2016-05-11 | 中国船舶重工集团公司七五〇试验场 | Doppler frequency shift simulator with dynamic underwater acoustic target echo simulation and simulation method |
| CN110095760A (en) * | 2019-04-24 | 2019-08-06 | 中国气象局气象探测中心 | A kind of test device and method of weather radar |
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