CN104007662A - Method and device for improving maximum signal to noise ratio consistency of radio frequency artificial antenna array - Google Patents
Method and device for improving maximum signal to noise ratio consistency of radio frequency artificial antenna array Download PDFInfo
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Abstract
The invention relates to the technical field of signal to noise ratios of radio frequency artificial antennas, and discloses a method and device for improving the maximum signal to noise ratio consistency of a radio frequency artificial antenna array. The device in which the method is adopted comprises a radio frequency artificial antenna array feed channel, a switch filter set is arranged in the radio frequency artificial antenna array feed channel, and a control circuit at the control end of the switch filter set is provided with a code converting plate which is connected with the external computer output frequency code end. By means of the method and device, radio frequency artificial antenna array substrate noise signals can be leveled and reduced in the full band, and the purpose of improving the maximum signal to noise ratio consistency of the radio frequency artificial antenna array is achieved. By means of practical measuring, the maximum signal to noise ratio can be improved to 30 dB, and the harmonic suppression can reach to -40 dBc.
Description
technical field
The present invention relates to radio frequency simulation antenna signal to noise ratio (S/N ratio) technical field, relate in particular to one and improve radio frequency simulation aerial array maximum signal to noise ratio coherence method and device.
Background technology
Radio frequency simulation aerial array is the important component part of radio frequency simulation pilot system, be mainly used in by signal environment simulate subsystem produce radiofrequency signal be radiated in microwave dark room, and under the control of radio frequency simulation pilot system control computing machine, by controlling amplitude, the phase place of radiofrequency signal, the continuous movement locus of the targets such as guinea pig.
Radio frequency simulation aerial array maximum signal to noise ratio has determined the dynamic range that radio frequency simulation pilot system can be worked, and is one of radio frequency simulation aerial array important indicator.Maximum noise on radio frequency simulation aerial array different frequent points and peak power output and ground noise are closely related.
Radio frequency simulation aerial array peak power output is mainly limited to the peak power output of feed passage intermediate power amplifier.In power amplifier working frequency range, the peak power output difference on different frequent points is little, and therefore the consistance of the maximum signal to noise ratio on radio frequency simulation aerial array different frequent points depends primarily on ground noise.
From Noise Theory, the ground noise of radio frequency simulation aerial array is directly proportional to the gain of feed passage, and in the gain of feed passage and passage, the transport property of device used is closely related.In the time that radio frequency simulation aerial array size is larger, in its feed passage, will use long coaxial radio frequency cable.Because radio frequency simulation aerial array working frequency range is wider, the transport property of the long concentric cable in feed passage is different on different frequent points, show as that low-frequency range loss is little, high band loss is large, this characteristic makes the gain of feed passage present the feature that low-frequency range is high, high band is low, thereby cause the ground noise of feed passage low-frequency range apparently higher than the ground noise of high band, the ground noise that its low-frequency range produces even can flood the useful signal of radio frequency simulation aerial array transmission.
Described Semi-Physical Simulation Test System: mathematical model, physical influence model and the analogue system forming together with actual interconnection, for carrying out l-G simulation test or carrying out correlative study.
Described radio frequency simulation aerial array: mainly formed by radio-frequency feed passage, control computing machine and spherical antenna array, when work, radio-frequency channel is fed to each radiating element of aerial array, the continuous motion of the targets such as guinea pig by radiofrequency signal by certain amplitude and phase place under control computer control.
Described ground noise: the thermonoise that active electronic equipment produces due to Electron Heat motion, through transmission, the amplification of radio-frequency feed passage, the noise signal producing at its output terminal.Maximum signal to noise ratio: the ratio that refers to the spiking output power on each frequency and ground noise power on radio frequency simulation aerial array full frequency band.Maximal input: while referring to that feed passage is operated in peak power output state, the power input of feed passage input port.Maximum signal to noise ratio consistance: the difference that refers to maximum signal to noise ratio on each frequency of radio-frequency channel.
Have at present multiple technologies to can be used for improving the maximum signal to noise ratio consistance of radio frequency simulation aerial array, but the harmonic wave that adopts these technology can reduce radio frequency simulation aerial array suppresses, and too high harmonic signal can produce false target, affects Simulation results.
Prior art scheme related to the present invention is as follows
In radio frequency simulation aerial array feed passage, add balanced device and can improve radio frequency simulation aerial array maximum signal to noise ratio consistance, and balanced device is passive device, have without power supply, cost is lower, the advantages such as simple are installed, but need to adjust according to the ground noise curve of radio frequency simulation aerial array the transport property of balanced device, and harmonic wave suppresses can only reach-15dBc.
The method that adds equalizer amplifier and attenuator in radio frequency simulation aerial array feed passage also can be improved the maximum signal to noise ratio consistance of radio frequency simulation aerial array, but equalizer amplifier is active device, can introduce additional noise, improves DeGrain; The method cannot effectively suppress harmonic signal equally simultaneously.
Summary of the invention
For overcoming the deficiencies in the prior art, the object of the present invention is to provide one to improve radio frequency simulation aerial array maximum signal to noise ratio coherence method and device.The present invention breaks through traditional conventional thinking, by ingenious the combining of existing ripe microwave device, can be on full frequency band leveling reduce radio frequency simulation aerial array ground noise signal, improve the conforming object of its maximum signal to noise ratio thereby realize.Measure through practice, can be by maximum signal to noise ratio consistency improvement 30dB by this programme, can ensure that harmonic wave suppresses reach-40dBc simultaneously.
For achieving the above object, the present invention adopts following technical scheme:
One is improved radio frequency simulation aerial array maximum signal to noise ratio consistance device, comprise: radio frequency simulation aerial array feed passage, in described radio frequency simulation aerial array feed passage, be provided with switch filter group, in the control circuit of switch filter group control end, be provided with code conversion plate, code conversion plate is connected with the computer export frequency code end of peripheral hardware.
One is improved radio frequency simulation aerial array maximum signal to noise ratio consistance device, and described radio frequency simulation aerial array feed passage consists of phase shifter power amplifier and electronic switch programmable attenuator, is positioned at and between power amplifier and electronic switch, is connected with switch filter group; Switch filter group is arranged on second level power amplifier output terminal.
One is improved radio frequency simulation aerial array maximum signal to noise ratio consistance device, described switch filter group is made up of two multi-channel electronic switch, bandpass filter and attenuators, is positioned at and between two multi-channel electronic switch, is connected with the algorithm circuit that several are composed in series by bandpass filter and attenuator;
Wherein, multi-channel electronic switch switching time is 0.1 μ s; Its Out-of-band rejection is-30dBc that inband flatness is ± 3dB.
One is improved radio frequency simulation aerial array maximum signal to noise ratio consistance device, described code conversion plate is made up of input interface, FPGA, power module and output interface, input interface is connected with output interface by FPGA module, and output interface is connected with two multi-channel electronic switch of switch filter group by data line.
One is improved radio frequency simulation aerial array maximum signal to noise ratio consistance device, and the input port of described code conversion plate adopts the LVDS receiving circuit of standard, receives the control signal being sent by LVDS by radio frequency simulation pilot system.
One is improved radio frequency simulation aerial array maximum signal to noise ratio coherence method, and its step is as follows:
1) adopt and install switch filter group additional in radio frequency simulation aerial array feed passage, and switch filter group two ends are connected between power amplifier and electronic switch by the radio frequency interface of external interface respectively, be i.e. second level power amplifier output terminal;
Wherein, radio frequency interface adopts the cloudy type SMA of standard interface, voltage standing wave ratio (VSWR) 2:1, maximal input 30dBm;
2) and in the control circuit of switch filter group control end, increase code conversion plate, code conversion plate is connected with external control computing machine by the control interface of external interface, and code conversion plate is connected with electronic switch by internal interface;
Wherein, the control interface of external interface adopts the LVDS interface of standard; Internal interface adopts standard TTL interface, and low-voltage is 0.2V, and high voltage is 4.6V, sets low-voltage effective;
3) leveling radio frequency simulation aerial array ground noise curve,
When leveling, radio frequency simulation pilot system is sent control signal before transmission radio-frequency pulse 2 μ s, contains frequency code in control signal, also has pulse code, pulse power information;
A. the input interface of code conversion plate, receives the frequency code that outer computer is exported, and code conversion plate receives after control signal, converts by interface module the LVTTL signal that FPGA can receive to; Extract frequency code by FPGA, convert thereof into multi-channel electronic switch control word according to the logical scope of the band of bandpass filter, and control word is carried out to latch;
The latch time is that 2 μ s subtract code conversion plate processing time and electronic switch control time, to guarantee that the electronic switch control time synchronizes with the external system control time;
The control word that FPGA sends, after output interface module conversion, becomes TTL interface voltage, switches thereby control electronic switch, realizes the control of code conversion to multi-channel electronic switch;
B. the electronic switch in switch filter group is realized synchronous switching under the control of identical control word, makes radiofrequency signal by the bandpass filter corresponding with its frequency and attenuator, bandpass filter filtering the ground noise signal outside band; Simultaneously ground noise in attenuator attentuating filter band, makes with interior ground noise signal power lower than by the sensitivity of seal test equipment;
When ground noise in bandpass filter band is X(dBm), wave filter, two total Insertion Loss of electronic switch are Y(dB), improved ground noise is Z(dBm), the damping capacity of this branch road attenuator used is:
X-Y-Z（dB） （1）；
Increase extra Insertion Loss, reduced channel gain, the peak power output of radio frequency simulation aerial array is reduced, changed the duty of power amplifier in passage simultaneously;
Under maximal input state, power amplifier no longer works in state of saturation, has now improved the input signal power of feed passage, makes power amplifier again saturated, and it is maximum that feed passage output power reaches; Leveling ground noise curve, simultaneously by increasing input signal, make peak power output on different frequent points keep basic identical, improve the conforming object of phantom antenna array maximum signal to noise ratio frequently thereby realize;
By selecting suitable bandpass filter bandwidth of operation, can ensure that harmonic signal is positioned at outside bandpass filter working band simultaneously, utilize the Out-of-band rejection of bandpass filter by harmonic signal filtering;
Can be by radio frequency simulation aerial array maximum signal to noise ratio consistency improvement 30dB, make the harmonic wave of feed passage suppress reach-40dBc simultaneously;
Wherein, multi-channel electronic switch switching time is 0.1 μ s; Its Out-of-band rejection is-30dBc that inband flatness is ± 3dB;
The damping capacity of simultaneously determining attenuator according to radio frequency simulation aerial array ground noise curve, the size of damping capacity calculates according to formula 1, makes the interior ground noise of band of bandpass filter be down to designing requirement.
Owing to adopting technical scheme as above, the present invention has following superiority:
The present invention is by the ground noise curve that increased the leveling of switch filter group in radio frequency simulation aerial array feed passage, simultaneously by increasing input signal, make the peak power output on different frequent points keep basic identical, improve the conforming object of maximum signal to noise ratio thereby realize.By selecting suitable bandpass filter bandwidth of operation, can ensure that harmonic signal is positioned at outside bandpass filter working band simultaneously, utilize the Out-of-band rejection of bandpass filter by harmonic signal filtering.
Be applicable to the ground noise curve on leveling radio frequency simulation aerial array full frequency band, can also be applied in other wide band radio-frequency systems.Can adjust flexibly according to the ground noise curve of radio frequency simulation aerial array, and can be by radio frequency simulation aerial array maximum signal to noise ratio consistency improvement 30dB, can ensure that harmonic wave suppresses reach-40dBc of index simultaneously.The system of having improved radio frequency simulation aerial array maximum signal to noise ratio consistance technique construction, has and utilizes ripe microwave device to carry out building of ingenious combination, and the construction cycle is short.
Brief description of the drawings
Figure l is the block diagram that improves radio frequency simulation aerial array maximum signal to noise ratio consistance device;
Fig. 2 switch filter group installation site schematic diagram;
Fig. 3 installs switch filter group ground noise additional and improves effect schematic diagram.
Embodiment
By reference to the accompanying drawings and embodiment, the present invention is further elaborated.
As shown in Figure 1, 2, 3, one is improved radio frequency simulation aerial array maximum signal to noise ratio consistance device, comprise: radio frequency simulation aerial array feed passage, in described radio frequency simulation aerial array feed passage, be provided with switch filter group, in the control circuit of switch filter group control end, be provided with code conversion plate, code conversion plate is connected with the computer export frequency code end of peripheral hardware.
Described radio frequency simulation aerial array feed passage consists of phase shifter power amplifier and electronic switch programmable attenuator, is positioned at and between power amplifier and electronic switch, is connected with switch filter group.
Described switch filter group is made up of two multi-channel electronic switch, bandpass filter and attenuators, is positioned at and between two multi-channel electronic switch, is connected with the algorithm circuit that several are composed in series by bandpass filter and attenuator.
Described code conversion plate is made up of input interface, FPGA, power module and output interface, and input interface is connected with output interface by FPGA module, and output interface is connected with two multi-channel electronic switch of switch filter group by data line.
One is improved radio frequency simulation aerial array maximum signal to noise ratio coherence method, adopt and install switch filter group additional in radio frequency simulation aerial array feed passage, and in control circuit, increase the measure of code conversion plate, and the ground noise curve of leveling radio frequency simulation aerial array, step is as follows:
Utilize switch filter group leveling radio frequency simulation aerial array ground noise curve, and by increasing input signal, the peak power output of feed passage is consistent substantially, improve the conforming object of radio frequency simulation aerial array maximum signal to noise ratio thereby realize, can ensure that the harmonic wave of feed passage suppresses reach-40dBc simultaneously;
(1) code conversion plate
The input port of code conversion plate adopts the LVDS receiving circuit of standard, receives the control signal being sent by LVDS by radio frequency simulation pilot system.Radio frequency simulation pilot system is sent control signal before transmission radio-frequency pulse 2 μ s, not only contains frequency code in control signal, also has the information such as pulse code, pulse power.Code conversion plate receives after control signal, converts by interface module the LVTTL signal that FPGA can receive to.Extract frequency code by FPGA, convert thereof into multi-channel electronic switch control word according to the logical scope of the band of bandpass filter, and control word is carried out to latch.The latch time is that 2 μ s subtract code conversion plate processing time and electronic switch control time, to guarantee that the electronic switch control time synchronizes with the external system control time.The control word that FPGA sends, after output interface module conversion, becomes TTL interface voltage, switches thereby control electronic switch.
(2) switch filter group
Switch filter group is made up of electronic switch, bandpass filter, attenuator.Electronic switch switching time is 0.1 μ s.The centre frequency of bandpass filter and bandwidth are definite according to actual needs, and its Out-of-band rejection is-30dBc that inband flatness is ± 3dB.Frequency between adjacent two wave filters is connected mutually, determines the damping capacity of attenuator according to radio frequency simulation aerial array ground noise curve simultaneously, makes the interior ground noise of band of bandpass filter be down to designing requirement.
Electronic switch in switch filter group is realized synchronous switching under the control of identical control word, makes radiofrequency signal by the bandpass filter corresponding with its frequency and attenuator, bandpass filter filtering the ground noise signal outside band; Ground noise in attenuator attentuating filter band, makes to be with interior ground noise signal to be reduced to acceptable size simultaneously.
Suppose that in bandpass filter band, ground noise is X(dBm), wave filter, two total Insertion Loss of electronic switch are Y(dB), improved ground noise is Z(dBm), the damping capacity of this branch road attenuator used is X-Y-Z(dB).
In radio frequency simulation aerial array feed passage, increase after switch filter group, increased extra Insertion Loss, reduced channel gain, the peak power output of radio frequency simulation aerial array is reduced, changed the duty of power amplifier in passage simultaneously.Under maximal input state, power amplifier no longer works in state of saturation, now can improve the input signal power of feed passage, makes power amplifier again saturated, and it is maximum that feed passage output power reaches.
By the ground noise curve that increased the leveling of switch filter group in radio frequency simulation aerial array feed passage, simultaneously by increasing input signal, make the peak power output on different frequent points keep basic identical, improve the conforming object of maximum signal to noise ratio thereby realize.
When designing filter, the bandwidth of wave filter is not more than to the twice of its centre frequency, can ensures that harmonic signal is positioned at outside bandpass filter working band, utilize the Out-of-band rejection of bandpass filter by harmonic signal filtering.
External interface comprises radio frequency interface and control interface
(1) radio frequency interface, the cloudy type SMA of employing standard interface, voltage standing wave ratio (VSWR) 2:1, maximal input 30dBm.
(2) control interface, adopts the LVDS interface of standard between external control computing machine and code conversion plate.
Internal interface, adopts standard TTL interface between electronic switch and code conversion plate, low-voltage is 0.2V, and high voltage is 4.6V.Low-voltage is effective.
Fig. 2 be in certain radio frequency simulation aerial array feed passage switch filter group install position view additional.Consider from the angle of improving radio frequency simulation aerial array ground noise, it is better that effect is improved the closer to channel end in switch filter group installation site.But as can be seen from the figure feed passage is divided into a lot of branch roads by switch endways, if install position more lean on after, required switch filter group quantity is more, cost is higher.Consider that the ground noise that third level power amplifier produces affects minimum to maximum signal to noise ratio consistance, be effectively to control improvement cost simultaneously, determine that switch filter group is arranged on second level power amplifier output terminal.By the method for above-mentioned increase switch filter group, can effectively reduce radio frequency simulation aerial array ground noise, its effect is as Fig. 3.
Claims (6)
1. one kind is improved radio frequency simulation aerial array maximum signal to noise ratio consistance device, it is characterized in that: comprising: radio frequency simulation aerial array feed passage, in described radio frequency simulation aerial array feed passage, be provided with switch filter group, in the control circuit of switch filter group control end, be provided with code conversion plate, code conversion plate is connected with the computer export frequency code end of peripheral hardware.
2. one according to claim 1 is improved radio frequency simulation aerial array maximum signal to noise ratio consistance device, it is characterized in that: described radio frequency simulation aerial array feed passage consists of phase shifter power amplifier and electronic switch programmable attenuator, be positioned at and between power amplifier and electronic switch, be connected with switch filter group; Switch filter group is arranged on second level power amplifier output terminal.
3. one according to claim 1 is improved radio frequency simulation aerial array maximum signal to noise ratio consistance device, it is characterized in that: described switch filter group is made up of two multi-channel electronic switch, bandpass filter and attenuators, be positioned at and between two multi-channel electronic switch, be connected with the algorithm circuit that several are composed in series by bandpass filter and attenuator;
Wherein, multi-channel electronic switch switching time is 0.1 μ s; Its Out-of-band rejection is-30dBc that inband flatness is ± 3dB.
4. one according to claim 1 is improved radio frequency simulation aerial array maximum signal to noise ratio consistance device, it is characterized in that: described code conversion plate is made up of input interface, FPGA, power module and output interface, input interface is connected with output interface by FPGA module, and output interface is connected with two multi-channel electronic switch of switch filter group by data line.
5. one according to claim 1 is improved radio frequency simulation aerial array maximum signal to noise ratio consistance device, it is characterized in that: the input port of described code conversion plate adopts the LVDS receiving circuit of standard, receive the control signal being sent by LVDS by radio frequency simulation pilot system.
6. one as claimed in claim 1 is improved radio frequency simulation aerial array maximum signal to noise ratio coherence method, it is characterized in that: its step is as follows: the ground noise curve of leveling radio frequency simulation aerial array,
1) adopt and install switch filter group additional in radio frequency simulation aerial array feed passage, and switch filter group two ends are connected between power amplifier and electronic switch by the radio frequency interface of external interface respectively, be i.e. second level power amplifier output terminal;
Wherein, radio frequency interface adopts the cloudy type SMA of standard interface, voltage standing wave ratio (VSWR) 2:1, maximal input 30dBm;
2) and in the control circuit of switch filter group control end, increase code conversion plate, code conversion plate is connected with external control computing machine by the control interface of external interface, and code conversion plate is connected with electronic switch by internal interface;
Wherein, the control interface of external interface adopts the LVDS interface of standard; Internal interface adopts standard TTL interface, and low-voltage is 0.2V, and high voltage is 4.6V, sets low-voltage effective;
3) leveling radio frequency simulation aerial array ground noise curve,
When leveling, radio frequency simulation pilot system is sent control signal before transmission radio-frequency pulse 2 μ s, contains frequency code in control signal, also has pulse code, pulse power information;
A. the input interface of code conversion plate, receives the frequency code that outer computer is exported, and code conversion plate receives after control signal, converts by interface module the LVTTL signal that FPGA can receive to; Extract frequency code by FPGA, convert thereof into multi-channel electronic switch control word according to the logical scope of the band of bandpass filter, and control word is carried out to latch;
The latch time is that 2 μ s subtract code conversion plate processing time and electronic switch control time, to guarantee that the electronic switch control time synchronizes with the external system control time;
The control word that FPGA sends, after output interface module conversion, becomes TTL interface voltage, switches thereby control electronic switch, realizes the control of code conversion to multi-channel electronic switch;
B. the electronic switch in switch filter group is realized synchronous switching under the control of identical control word, makes radiofrequency signal by the bandpass filter corresponding with its frequency and attenuator, bandpass filter filtering the ground noise signal outside band; Ground noise in attenuator attentuating filter band, makes to be reduced to by the sensitivity of seal test equipment with interior ground noise signal simultaneously;
When ground noise in bandpass filter band is X(dBm), wave filter, two total Insertion Loss of electronic switch are Y(dB), improved ground noise is Z(dBm), the damping capacity of this branch road attenuator used is X-Y-Z(dB);
Increase extra Insertion Loss, reduced channel gain, the peak power output of radio frequency simulation aerial array is reduced, changed the duty of power amplifier in passage simultaneously;
Under maximal input state, power amplifier no longer works in state of saturation, has now improved the input signal power of feed passage, makes power amplifier again saturated, and it is maximum that feed passage output power reaches; Leveling ground noise curve, simultaneously by increasing input signal, make peak power output on different frequent points keep basic identical, improve the conforming object of phantom antenna array maximum signal to noise ratio frequently thereby realize;
By selecting suitable bandpass filter bandwidth of operation, can ensure that harmonic signal is positioned at outside bandpass filter working band simultaneously, utilize the Out-of-band rejection of bandpass filter by harmonic signal filtering;
Can be by radio frequency simulation aerial array maximum signal to noise ratio consistency improvement 30dB, make the harmonic wave of feed passage suppress reach-40dBc simultaneously;
Wherein, multi-channel electronic switch switching time is 0.1 μ s; Its Out-of-band rejection is-30dBc that inband flatness is ± 3dB;
The damping capacity of simultaneously determining attenuator according to radio frequency simulation aerial array ground noise curve, the size of damping capacity calculates according to formula 1, makes the interior ground noise of band of bandpass filter be down to designing requirement.
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