CN115276846B - X-frequency band single pulse tracking analog signal source output equipment - Google Patents
X-frequency band single pulse tracking analog signal source output equipment Download PDFInfo
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Abstract
The invention relates to an X-frequency band single-pulse tracking analog signal source output device, which is used for setting various working scenes, simulating various working states of a single-pulse tracking receiving antenna, providing a single-pulse antenna analog signal source for single-pulse tracking receiver manufacturers, simulating sum and difference channel signals and changes received by the antenna under various scenes, and providing the signals and changes for various single-pulse tracking receivers to carry out laboratory debugging, testing and inspection; the X-frequency band monopulse tracking antenna simulated by the equipment has no transmitting function and only has receiving capability, and the antenna outputs X-frequency band and difference channel radio frequency signals; various working scenes of the X-band single-pulse tracking antenna can be simulated; the device can meet the debugging and testing requirements of the single-pulse single-channel, double-channel or three-channel tracking receiver.
Description
Technical Field
The invention relates to an automatic antenna tracking technology, in particular to an X-band single-pulse tracking analog signal source output device.
Background
Monopulse automatic tracking receiving antennas are commonly used for tracking fast moving targets such as medium and low orbit satellites, airplanes, missiles and the like, and the antennas track by means of receiving the signals of the targets which radiate beacons or carry information. The antenna receives the beacon or signal, forms a sum-difference signal in the feed source, amplifies the sum-difference signal and feeds the amplified sum-difference signal to the monopulse tracking receiver, so as to indicate the azimuth and pitching deviation angle for the servo system and realize the automatic tracking of the antenna.
Because of the lack of a signal source capable of simulating the dynamic receiving signals of the monopulse tracking antenna, debugging and checking work of the monopulse tracking receiver is generally difficult to develop in a laboratory, and field debugging and functional performance checking can be performed after the antenna is installed, so that the development efficiency of the monopulse tracking receiver is restricted.
Disclosure of Invention
Aiming at the problems existing in the antenna tracking receiving test, the X-band single-pulse tracking analog signal source output equipment is provided, the signal output of the single-pulse tracking receiving antenna in various typical working scenes is simulated, and a test signal source is provided for a single-pulse tracking receiver so as to test the functions and performance indexes of the receiver.
The technical scheme of the invention is as follows: an X-band single pulse tracking analog signal source output device comprises a signal generating unit, an adjustable attenuator A, 5 power splitters, an adjustable attenuator B, an adjustable phase shifter A, a power supply module for supplying power, a numerical control unit, an adjustable attenuator C and an adjustable phase shifter B,
the numerical control unit: the method is used for man-machine interaction, parameter setting, state display and equipment internal control;
the signal generation unit: receiving radio frequency signal parameters of a numerical control unit, and simulating any frequency point radio frequency signal output in an X frequency band;
the adjustable attenuator A: the receiving signal generating unit outputs a radio frequency signal, and under the control of the numerical control unit, the change of the power of a receiving target signal in the single pulse tracking process of the analog antenna is realized;
the first power divider and the second power divider: the adjustable attenuator A outputs a signal of the working frequency band of the tracking antenna, the signal is divided into two paths through a first power divider, one path of signal and the channel signal are directly output as a sigma signal and a channel signal, the other path of signal is further divided into two channel signals of delta AZ azimuth difference and delta EL pitching difference through a second power divider, and amplitude and phase adjustment processing is carried out respectively;
the adjustable attenuator B: receiving the delta AZ azimuth difference channel signal in a simulation manner, and simulating the amplitude of the delta AZ azimuth difference channel signal under the control of a numerical control unit;
the adjustable attenuator C: analog receiving the delta EL pitch difference channel signal, and under the control of the numerical control unit, simulating the amplitude of the delta EL pitch difference channel signal;
the adjustable phase shifter A: receiving the delta AZ azimuth difference channel signal in a simulation manner, and simulating the phase of the delta AZ azimuth difference channel signal under the control of a numerical control unit;
the adjustable phase shifter B: analog receiving the delta EL pitch difference channel signal, and under the control of the numerical control unit, simulating the phase of the delta EL pitch difference channel signal;
the third power divider: receiving the delta AZ azimuth difference signals after amplitude and phase adjustment respectively and outputting;
the fourth power divider: inputting the output signals of the three-power divider and the five-power divider, and outputting a delta-difference signal;
the fifth power divider: and receiving the delta EL pitching difference signal output after amplitude and phase adjustment respectively.
Preferably, the signal generating unit receives antenna caliber, working frequency, bandwidth and feed source output mode, outputs any frequency point radio frequency signal in the frequency band of 7 GHz-9 GHz, and simulates a target radiation source signal.
Preferably, the numerical control unit receives the initial phase difference of the sum and difference channels and the pointing position of the antenna set by the user, and performs analog calculation on the signal amplitude and phase relation of the sum and difference channels at most by 3 antenna pointing positions and residence time, so as to form the linkage relation of the signal amplitude and phase between the sum and difference channels.
Preferably, the pointing position of the receiving antenna of the numerical control unit deviates from the antenna zero point angle theta, and the value of the adjustable attenuator A is f ∑ (θ), i.e., the sum channel amplitude decay curve is modeled as:
wherein the deviation angle θ is in mils, 1 mil= 0.05625 °; m is a fitting coefficient, and the value formula of m is as follows according to different antenna calibers D:
m(D)＝8290.4D 2 -8284.3D+13154。
preferably, the adjustable attenuator B and the adjustable attenuator C simulate the amplitude of the Δaz azimuth difference and Δel pitch difference channel signals, respectively, and the amplitudes are α respectively AZ And alpha EL ：
Wherein P is zero depth input by a user, unit dB and simulates feed source performance; θ AZ And theta EL The azimuth and pitching deviation angles input by the user are respectively given in mil; θ AZ And theta EL Is a signed valueThe target is positioned on the right side of the antenna, theta AZ Is a positive number; the target is positioned at the left side of the antenna, theta AZ Is a negative number; the target is located above the antenna, θ EL Is a positive number; the target is positioned with the antenna pointing downwards, theta EL Is a negative number; the antenna is directed to be the null point of the differential beam, theta AZ And theta EL Taking a value of 0; f is the working frequency, unit GHz; f (f) ∑ (θ AZ ) And f ∑ (θ EL ) Respectively is theta AZ And theta EL Substitution of f ∑ And (θ) the calculation result of the formula, in dB.
Preferably, the values of the adjustable phase shifter A and the adjustable phase shifter B are respectively phis AZ And phs EL Unit degree:
Phs AZ (θ AZ )＝(2-sgn(θ AZ +Phs0 AZ ))·90°+Phs0 AZ
Phs EL (θ EL )＝(2-sgn(θ EL +Phs0 EL ))·90°+Phs0 EL
in the formula, phs0 AZ And phs0 EL Initial phase differences characterizing azimuth and pitch and differential channel cross-couplings, respectively, in degrees; θ AZ And theta EL The azimuth and pitching deviation angles input by the user are respectively given in mil;
f (x) =sgn (x) is a sign function, and when x is (negative, zero, positive) respectively, outputs (-1, 0, +1).
Preferably, the numerical control unit sets a static mode and a dynamic mode, wherein the static mode is as follows: the analog source only works at one point position, namely, continuously outputs a sum-path difference signal of the pointing position until the user changes the setting; dynamic mode: the simulation source provides 3 points, and according to the coordinates of the user points and the setting of the residence time of each point, the sequence is automatically switched among the 3 points to be circulated continuously.
The invention has the beneficial effects that: the X-band single-pulse tracking analog signal source output equipment provides a single-pulse antenna analog signal source for single-pulse tracking receiver manufacturers, simulates sum and difference channel signals and changes received by antennas in various scenes, and provides the sum and difference channel signals and changes for various single-pulse tracking receivers to carry out laboratory debugging, testing and inspection; the X-frequency band monopulse tracking antenna simulated by the equipment has no transmitting function and only has receiving capability, and the antenna outputs X-frequency band and difference channel radio frequency signals; various working scenes of the X-band single-pulse tracking antenna can be simulated; the device can meet the debugging and testing requirements of the single-pulse single-channel, double-channel or three-channel tracking receiver.
Drawings
FIG. 1 is a schematic block diagram of an X-band single pulse tracking analog signal source output device of the present invention;
FIG. 2 is a schematic diagram of the front panel structure of the X-band single-pulse tracking analog signal source output device of the present invention;
FIG. 3 is a schematic diagram of a rear panel of the X-band single-pulse tracking analog signal source output device of the present invention;
FIG. 4 is a graph showing the magnitude of the sum and difference channel signals relative to each other;
FIG. 5 is a schematic diagram of the phase relationship of the sum and difference channel signals;
FIG. 6 is a graph of difference channel signal relationship;
FIG. 7 is a flowchart of the operation of the X-band single pulse tracking analog signal source output device of the present invention.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples.
Aiming at the characteristics of various monopulse tracking antennas and signal sources required by debugging of various monopulse tracking receivers, the invention provides an analog signal source which can be used for debugging and testing of the X-band monopulse tracking receiver under the condition of no real X-band monopulse tracking antenna. The X-band single pulse tracking analog signal source output device is shown in a schematic block diagram in fig. 1, and comprises a signal generating unit 1, an adjustable attenuator A2, a power divider 3, an adjustable attenuator B4, an adjustable phase shifter A5, a power supply module 6, a numerical control unit 7, an adjustable attenuator C8 and an adjustable phase shifter B9. In fig. 1, a plurality of power splitters have the same characteristics and can be interchanged.
Fig. 1 is a schematic diagram of front and rear panels of an X-band single-pulse tracking analog signal source output device shown in fig. 2 and 3, including a front panel 10 of the device, an oled display 11, a status indication LED12, a content selection input key 13, an input confirm and cancel key 14, a ship-type power switch 15, a rear panel 16 of the device, a sigma-sum channel (and channel) signal output socket 17, a remote control socket 18 (UTP network interface), a delta-difference channel (difference channel) signal output 19 (N-50 KF socket), a delta-AZ azimuth difference channel (azimuth difference channel) signal output 20 (N-50 KF socket), a delta-EL pitch difference channel (pitch difference channel) signal output socket 21 (N-50 KF socket), and an AC 220V AC power socket 22, and illustrates the following units:
(1) Signal generation unit 1: the method is used for providing any frequency point radio frequency signals in the frequency range of 7 GHz-9 GHz for an analog source, and the signal modulation modes comprise single carrier, amplitude modulation, frequency modulation and phase modulation.
The signal generating unit 1 simulates a target signal received by an antenna, generates an X-band radio frequency signal according to set parameters, and can set output power by a user or default output power P according to the caliber of the simulated antenna 1 The formula is: p (P) 1 = -60dbm+20log d, where the output power P 1 The unit is dBm; d is the caliber of the antenna, and the unit meter.
The frequency, bandwidth and modulation mode of the radio frequency signal are input into the front panel of the device, and the target radiation source signal received by the single pulse tracking antenna is simulated.
(2) Numerical control unit 7: the method is used for man-machine interaction, parameter setting, state display and equipment internal control, and a user can set various working scenes to simulate various working states of the single pulse tracking receiving antenna. The display state of the Organic Light-Emitting Diode (OLED) display screen of the front panel can be manually set by a user on the front panel of the analog source; and the back panel network numerical control interface can also be used for inputting and outputting. The simulation source parameters can be set by remote control based on a remote control interface of a numerical control network, and various discrete, intermittent or continuous single pulse tracking scenes can be developed secondarily.
The numerical control unit 7 receives user settings including antenna caliber, operating frequency, bandwidth, modulation mode (characteristic inherent to analog signals), power (set power output), antenna pointing position (azimuth and pitching deviation angle), and difference channel initial phase difference, at most 3 antenna pointing positions and residence time, etc. The numerical control unit 7 simultaneously displays the working state of the equipment, and the display content comprises the output power of the signal generating unit 1, whether the working state is normal, the current numerical control state (local control/remote control), the current antenna pointing position, residence time and the like.
The numerical control unit comprises analog computing capacity of the signal amplitude and phase relation of the sum and difference channels, and forms linkage relation of the signal amplitude and phase between the sum and difference channels.
(3) An adjustable attenuator: under the action of a numerical control unit, carrying out controlled attenuation on the X-frequency band radio frequency signal, wherein the attenuation amplitude ranges from 0dB to 60dB, and the step is 0.5dB; the method can be realized by serially connecting 2 6bit control code numerical control attenuators.
(4) Power divider/combiner: the passive component can realize one-to-two or two-to-one of the X frequency band signals according to the input-output connection relation.
The adjustable attenuator A2 simulates the change of the power of a received target signal in the single pulse tracking process of the antenna, such as the strongest power when the target is over-top and the weakest power when the target is on-line. The radio frequency signal output by the signal generating unit 1 is divided into two paths after passing through the adjustable attenuator A2 and the power divider 3-1 in sequence. The one-way and channel signals are directly output as sigma-delta channel signals to a sigma-delta channel (and channel) signal output socket 17 of the analog source device rear panel 16, and the socket adopts an N-50KF physical structure. The other path of difference channel signals are further divided into two channel signals of delta AZ azimuth difference and delta EL pitch difference through the power divider 3-2, amplitude and phase adjustment processing is carried out respectively, and finally the two channel signals are output by the azimuth difference paths, the difference paths and the pitch difference paths through the power dividers 3-3, 3-4 and 3-5 respectively.
In combination with the schematic diagram of the sum and difference channel signal amplitude versus shown in fig. 4, the sigma and channel signal amplitude is a solid line, the delta difference channel signal amplitude is a dashed line, and θ 1 For the corresponding angle of the antenna main beam zero depth, the single pulse tracking antenna is a typical parabolic antenna, and the main beam directional diagram of the signal receiving channel can be simulated by using a parabolic function. The parabolic top point of the main beam directional diagram of the antenna with different aperture isThe theoretical gain, the beamwidth, is related to the parabolic coefficients.
Taking the zero angle theta of the offset antenna as the horizontal axis, the value of the adjustable attenuator A2, namely the sum channel amplitude attenuation curve, can be simulated as follows:
wherein the deviation angle θ is in mils, 1 mil= 0.05625 °; m is a fitting coefficient, and the value formula of m is as follows according to different antenna calibers D:
m(D)＝8290.4D 2 -8284.3D+13154。
(5) The adjustable attenuator B4 and the adjustable attenuator C8 simulate the amplitude of the Δaz azimuth difference and Δel elevation difference channel signals, respectively. The values of the components are alpha respectively AZ And alpha EL ：
Wherein P is zero depth input by a user, unit dB and simulates feed source performance; θ AZ And theta EL The azimuth and pitch deviation angles, in mil, respectively, entered by the user. θ AZ And theta EL For signed values, the target is located on the right side of the antenna, θ AZ Is a positive number; the target is positioned at the left side of the antenna, theta AZ Is a negative number; the target is located above the antenna, θ EL Is a positive number; the target is positioned with the antenna pointing downwards, theta EL Is a negative number; the antenna is directed to be the null point of the differential beam, theta AZ And theta EL Take the value 0.D is the caliber of the antenna, and the unit meter; f is the working frequency, unit GHz; f (f) ∑ (θ AZ ) And f ∑ (θ EL ) Respectively is theta AZ And theta EL Substitution of f ∑ And (θ) the calculation result of the formula, in dB.
(6) An adjustable phase shifter: under the action of a numerical control unit, the X-frequency band radio frequency signal is subjected to controlled phase shifting, the phase shifting range is 0-500 degrees, the step is 2 degrees, and the 8bit control code is adopted.
The adjustable phase shifter A5 and the adjustable phase shifter B9 simulate the phase of the Δaz azimuth difference and Δel elevation difference channel signals, respectively. In combination with the schematic diagram of the sum and difference channel signal phase relationship shown in fig. 5 (sigma and channel signal amplitude-phase curves are solid lines, delta difference channel signal amplitude-phase curves are dashed lines. Wherein the fitted difference channel signal amplitude-phase variation curvesFor normalizing the directional sensitivity curve), the values of the adjustable phase shifter A5 and the adjustable phase shifter B9 are respectively phis AZ And phs EL Unit ° (degree):
Phs AZ (θ AZ )＝(2-sgn(θ AZ +Phs0 AZ ))·90°+Phs0 AZ
Phs EL (θ EL )＝(2-sgn(θ EL +Phs0 EL ))·90°+Phs0 EL
in the formula, phs0 AZ And phs0 EL Initial phase differences characterizing azimuth and pitch and differential channel cross-couplings, respectively, in degrees; θ AZ And theta EL The azimuth and pitch deviation angles, in mil, respectively, entered by the user.
f (x) =sgn (x) is a sign function, and when x is (negative, zero, positive) respectively, outputs (-1, 0, +1).
(7) After the amplitude and the phase of the delta AZ azimuth difference channel and the delta EL elevation difference channel signals are precisely adjusted, the delta AZ azimuth difference channel (azimuth difference channel) signals and the delta EL elevation difference channel (elevation difference channel) signals are combined to form delta elevation difference channel (elevation difference channel) signals according to a difference channel signal relation diagram shown in fig. 6, wherein the delta AZ azimuth difference channel and the delta EL elevation difference channel signals are in an orthogonal relation, the delta AZ azimuth difference channel and the delta EL elevation difference channel (elevation difference channel) signals are combined, the origin of coordinates represents a differential beam zero point, the azimuth axis positively represents the antenna negatively biased, and the elevation axis positively represents the antenna downwardly biased and reversely upwardly biased, and if the delta AZ azimuth difference channel and the delta EL elevation difference channel are independently output, the delta AZ azimuth difference channel and the delta EL elevation difference channel signals can be output to a three-channel single pulse tracking receiver together for debugging. If the delta AZ azimuth difference channel and the delta EL pitching difference channel signals are combined to be delta difference channel signals, the delta difference channel signals can be output to a dual-channel or single-channel single-pulse tracking receiver for debugging.
(8) Power module 6: the AC-DC power supply provides DC power supply for the X frequency band signal generating unit, the digital control unit, the adjustable attenuator and the adjustable phase shifter.
The X-band single pulse tracking analog signal source provided by the invention has the following two working modes:
(1) Static mode: the analogue source operates at only one point, i.e. continuous output (θ AZ ，θ EL ) And a sum and difference path signal pointing to the location until the user changes the setting.
(2) Dynamic mode: the simulation source provides 3 points, and according to the coordinates of the user points and the setting of the residence time of each point, the sequence is automatically switched among the 3 points to be circulated continuously.
In combination with the working flow chart of the X-band single pulse tracking analog signal source output device shown in fig. 7, the working flow of the X-band single pulse tracking analog signal source of the invention is as follows:
(1) And (5) setting parameters. The ship-shaped power switch 15 of the front panel 10 of the device is pressed to start, if the status indication LED12 and the OLED display screen 11 are displayed normally, parameter setting can be carried out through the content selection input key 13 and the input confirmation and cancel key 14, and remote setting can also be carried out through the remote control socket network interface 18. The setting item selected by the content selection input key 13 is prompted in a character blinking manner, and the content selection input key 13 moves away the cursor to indicate that the input is completed. After all parameters are set, the input confirm and cancel button 14 is pressed to confirm, and then the analog source device operates the internal program according to the set parameters, and outputs the required debugging signals. After the parameters are set, the simulation source equipment automatically memorizes, the shutdown does not affect the parameter storage, and after the restarting, the parameters which are set last time are automatically called. The simulation source may hold 10 sets of parameters.
(2) And executing the operation. According to the set parameter set, the analog source sequentially completes the adjustment of each adjustable attenuator and each adjustable phase shifter according to the sequence of the sigma and the path channel amplitude, the delta AZ azimuth difference channel amplitude, the delta EL elevation difference channel signal amplitude, the delta AZ azimuth difference channel phase and the delta EL elevation difference channel signal phase, and realizes the output of analog signals of each channel. If only 1 pointing position parameter set is set, the sigma and path (and channel) signal output socket 17 of the device rear panel 16 outputs a sigma and path signal, the Δaz azimuth difference path (azimuth difference channel) signal output socket 20 outputs a Δaz azimuth difference signal, the Δel elevation difference path (elevation difference channel) signal output socket 21 outputs a Δel elevation difference signal, and the Δdifference path (difference channel) signal output socket 19 outputs a Δdifference path signal, regardless of whether the residence time is set. If more than 1 pointing position parameter sets are set, each position outputs a residence time length signal according to the position parameters, and then jumps to the next pointing position and repeatedly loops.
(3) The interrupt is terminated. If the signal output is interrupted at the corresponding output port, the boat-shaped power switch 15 of the front panel 10 of the device can be pressed to turn off the power supply; alternatively, the operating frequency is set to other frequencies; alternatively, the output port is connected to an N-type load.
The X-band single pulse tracking analog signal source works in the following scenes:
(1) And debugging and checking the X-band single-channel single-pulse tracking receiver. The sum signal input end of the X-band single-channel single-pulse tracking receiver is connected with a sigma-sum path (sum channel) signal output socket 17 of the rear panel 16 of the device, the difference signal input end of the X-band single-channel single-pulse tracking receiver is connected with a delta-difference path (difference channel) signal output socket 19 of the rear panel 16 of the device, and parameters are set according to requirements, so that corresponding debugging and checking work can be carried out.
(2) And debugging and checking the X-band dual-channel single-pulse tracking receiver. The sum signal input end of the X-band single-channel single-pulse tracking receiver is connected with a sigma-sum path (sum channel) signal output socket 17 of the rear panel 16 of the device, the difference signal input end of the X-band single-channel single-pulse tracking receiver is connected with a delta-difference path (difference channel) signal output socket 19 of the rear panel 16 of the device, and parameters are set according to requirements, so that corresponding debugging and checking work can be carried out.
(3) And debugging and checking the X-band three-channel single pulse tracking receiver. The sum signal input end of the X-band single-channel single-pulse tracking receiver is connected with a sigma-sum path (sum channel) signal output socket 17 of the rear panel 16 of the device, the azimuth difference signal input end of the X-band single-channel single-pulse tracking receiver is connected with a delta AZ azimuth difference path (azimuth difference channel) signal output socket 20 of the rear panel 16 of the device, the pitch difference signal input end of the X-band single-channel single-pulse tracking receiver is connected with a delta EL pitch difference path (pitch difference channel) signal output socket 21 of the rear panel 16 of the device, and parameters are set according to requirements, so that corresponding debugging and inspection work can be carried out.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (3)
1. An X-band single pulse tracking analog signal source output device is characterized by comprising a signal generating unit, an adjustable attenuator A, 5 power dividers, an adjustable attenuator B, an adjustable phase shifter A, a power supply module for supplying power, a numerical control unit, an adjustable attenuator C and an adjustable phase shifter B,
the numerical control unit: the method is used for man-machine interaction, parameter setting, state display and equipment internal control;
the signal generation unit: receiving radio frequency signal parameters of a numerical control unit, and simulating any frequency point radio frequency signal output in an X frequency band;
the adjustable attenuator A: the receiving signal generating unit outputs a radio frequency signal, and under the control of the numerical control unit, the change of the power of a receiving target signal in the single pulse tracking process of the analog antenna is realized;
first and second power dividers: the adjustable attenuator A outputs a signal of the working frequency band of the tracking antenna, the signal is divided into two paths through a first power divider, one path of signal and the channel signal are directly output as a sigma signal and a channel signal, the other path of signal is further divided into two channel signals of delta AZ azimuth difference and delta EL pitching difference through a second power divider, and amplitude and phase adjustment processing is carried out respectively;
the adjustable attenuator B: receiving the delta AZ azimuth difference channel signal in a simulation manner, and simulating the amplitude of the delta AZ azimuth difference channel signal under the control of a numerical control unit;
the adjustable attenuator C: analog receiving the delta EL pitch difference channel signal, and under the control of the numerical control unit, simulating the amplitude of the delta EL pitch difference channel signal;
the adjustable phase shifter A: receiving the delta AZ azimuth difference channel signal in a simulation manner, and simulating the phase of the delta AZ azimuth difference channel signal under the control of a numerical control unit;
the adjustable phase shifter B: analog receiving the delta EL pitch difference channel signal, and under the control of the numerical control unit, simulating the phase of the delta EL pitch difference channel signal;
third power divider: receiving the delta AZ azimuth difference signals after amplitude and phase adjustment respectively and outputting;
fourth power divider: inputting the output signals of the third and fifth power dividers and outputting a delta-difference signal;
fifth power divider: receiving the delta EL pitching difference signal output after amplitude and phase adjustment respectively;
the numerical control unit receives the initial phase difference of the sum and difference channel and the pointing position of the antenna set by a user, and performs analog calculation on the signal amplitude and phase relation of the sum and difference channel at most by 3 antenna pointing positions and residence time; the numerical control unit comprises analog computing capacity of the signal amplitude and phase relation of the sum and difference channels, and forms linkage relation of the signal amplitude and phase between the sum and difference channels;
the pointing position of the receiving antenna of the numerical control unit deviates from the antenna zero angle theta, and the value of the adjustable attenuator A is f ∑ (θ), i.e., the sum channel amplitude decay curve is modeled as:
wherein the deviation angle θ is in mils, 1 mil= 0.05625 °; m is a fitting coefficient, and the value formula of m is as follows according to different antenna calibers D:
m(D)＝8290.4D 2 -8284.3D+13154；
the adjustable attenuator B and the adjustable attenuator C respectively simulate the amplitude of the delta AZ azimuth difference and the delta EL pitching difference channel signals, and the amplitudes are respectively alpha AZ And alpha EL ：
Wherein P is zero depth input by a user, unit dB and simulates feed source performance; θ AZ And theta EL The azimuth and pitching deviation angles input by the user are respectively given in mil; θ AZ And theta EL For signed values, the target is located on the right side of the antenna, θ AZ Is a positive number; the target is positioned at the left side of the antenna, theta AZ Is a negative number; the target is located above the antenna, θ EL Is a positive number; the target is positioned with the antenna pointing downwards, theta EL Is a negative number; the antenna is directed to be the null point of the differential beam, theta AZ And theta EL Taking a value of 0; f is the working frequency, unit GHz; f (f) ∑ (θ AZ ) And f ∑ (θ EL ) Respectively is theta AZ And theta EL Substitution of f ∑ Calculation result of (θ) formula, unit dB;
the values of the adjustable phase shifter A and the adjustable phase shifter B are respectively phis AZ And phs EL Unit degree:
Phs AZ (θ AZ )＝(2-sgn(θ AZ +Phs0 AZ ))·90°+Phs0 AZ
Phs EL (θ EL )＝(2-sgn(θ EL +Phs0 EL ))·90°+Phs0 EL
in the formula, phs0 AZ And phs0 EL Initial phase differences characterizing azimuth and pitch and differential channel cross-couplings, respectively, in degrees;θ AZ and theta EL The azimuth and pitching deviation angles input by the user are respectively given in mil;
f (x) =sgn (x) is a sign function, and when x is (negative, zero, positive) respectively, outputs (-1, 0, +1).
2. The X-band single pulse tracking analog signal source output device according to claim 1, wherein the numerical control unit sets two modes, a static mode and a dynamic mode, the static mode: the analog source only works at one point position, namely, continuously outputs a sum-path difference signal of the pointing position until the user changes the setting;
dynamic mode: the simulation source provides 3 points, and according to the coordinates of the user points and the setting of the residence time of each point, the sequence is automatically switched among the 3 points to be circulated continuously.
3. The X-band single-pulse tracking analog signal source output device according to claim 1, wherein the signal generating unit receives antenna caliber, working frequency, bandwidth and feed source output mode, outputs any frequency point radio frequency signal in a frequency band of 7 GHz-9 GHz, and simulates a target radiation source signal.
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| CN202210645092.3A CN115276846B (en) | 2022-06-09 | 2022-06-09 | X-frequency band single pulse tracking analog signal source output equipment |
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