CN111624562B - Radar echo inter-pulse walking phenomenon simulation device, system and method - Google Patents
Radar echo inter-pulse walking phenomenon simulation device, system and method Download PDFInfo
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- CN111624562B CN111624562B CN202010370529.8A CN202010370529A CN111624562B CN 111624562 B CN111624562 B CN 111624562B CN 202010370529 A CN202010370529 A CN 202010370529A CN 111624562 B CN111624562 B CN 111624562B
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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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- 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
- G01S7/4004—Means for monitoring or calibrating of parts of a radar system
- G01S7/4021—Means for monitoring or calibrating of parts of a radar system of receivers
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Abstract
The invention discloses a radar echo inter-pulse walking phenomenon simulation device, a system and a method, wherein the device comprises a pulse envelope period counter, a baseband signal generator, a phase-shifting signal generator and a phase-shifting modulator; the pulse envelope period counter is used for forming a pulse envelope signal according to the radar waveform parameters and the coarse-granularity walking parameters; the baseband signal generator is used for forming a baseband signal according to the radar frequency and forming an output signal under the enabling action of the pulse envelope signal; the phase-shifting signal generator is used for forming a phase-shifting signal according to the fine-grained phase-shifting parameter; the phase-shifting modulator is used for carrying out complex multiplication modulation on the output signal and the phase-shifting signal to obtain a radar echo simulation signal.
Description
Technical Field
The invention relates to the technical field of radar echo simulation. And more particularly, to a radar echo inter-pulse walking phenomenon simulation apparatus, system and method.
Background
A common coherent pulse system radar is a pulse doppler radar, which has both the distance resolution of a pulse radar and the velocity resolution of a continuous wave radar, can distinguish a moving target under a strong clutter background, and often selects a chirp as a transmit waveform in order to improve the distance resolution. In order to enhance the detection capability of a weak target, a plurality of echo pulses of one target are generally subjected to pulse coherent accumulation processing.
For a static target, the echo signal is basically unchanged, the noise is uniform after pulse coherent accumulation, and the echo signal is highlighted. Whereas for a high speed moving object the relative speed between the object and the time difference measuring means of the radar causes the pulse envelope to walk between different pulse repetition periods. This envelope walk-off phenomenon causes the sampling amplitude between pulses to be non-uniformly weighted, resulting in a significant degradation of the coherent accumulation performance. Therefore, the radar receiver section needs to perform special processing to complete the final correct coherent accumulation.
The evaluation test radar receiver is not easy to realize in actual scenes, the cost of artificially generating real environments is too large, and the radar simulator is a signal source device capable of providing radar simulation scenes and can provide a large number of space hypothetical targets and simulation echo signals of environments to a tested radar to simulate various working environments in which the radar may be positioned. The simulated echo signals vividly reflect the motion characteristics, the space characteristics and the interference characteristics of the target, so that the capabilities of the radar in finding and tracking the target in a complex electromagnetic environment, scheduling and distributing time energy resources in various clutter environments and the like are tested. When the ability of the radar receiver for processing the echo of the high-speed moving target is evaluated, the radar simulator can simulate a target echo signal with an inter-pulse walking phenomenon for evaluation test.
The main realization mode of the existing simulation of the inter-pulse walking phenomenon is to use a counter to complete the walking change of an echo envelope period in an echo envelope processing platform of a radar simulator. The radar simulator calculates different repetition period values of the radar echo envelope cycle when the radar echo moves between pulses according to the evaluation test requirements of the radar receiver, and the moving period values are larger or smaller relative to the basic envelope cycle, as shown in fig. 1. And the calculated parameters are transmitted to an echo envelope processing platform, a counter is called by the processing platform, envelope period counting is completed according to transmitted period values, then an envelope signal is transmitted to control radar echo output, and the envelope signal is transmitted to a radar receiver to be received and processed, so that the inter-pulse walking simulation of the radar echo signal is completed.
The simulation time particles of the walking simulation are a main technical index, which is equivalent to discretizing the change value of the walking between pulses. The radar receiver hopes that the smaller the simulation time particle is, the better the simulation time particle is, and thus the simulated radar echo signal is closer to the real echo signal. The prior art simulation time grain is mainly limited by the driving clock period of the counter. The highest clock frequency that can currently drive the counters is about 250MHz to 333MHz, and the simulation time minimum grain is between 3ns to 4 ns. The particle value is sufficient in the conventional radar system, but with the high-speed development of the radar technology, particularly the development of the high-resolution radar technology, the simulation time particles of 3 ns-4 ns cannot meet the evaluation test requirement of the high-resolution radar system, so that the simulation time particle precision needs to be further improved, and the high-precision simulation problem of the echo pulse-to-pulse motion is solved.
Disclosure of Invention
The invention aims to provide a radar echo inter-pulse walking phenomenon simulation device, which solves the problem that the radar echo inter-pulse walking phenomenon cannot be simulated with high precision. Another object of the present invention is to provide a system for simulating the inter-pulse walking phenomenon of radar echoes. It is still another object of the present invention to provide a method for simulating the inter-pulse walking phenomenon of radar echo.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention discloses a radar echo inter-pulse walking phenomenon simulation device which comprises a pulse envelope period counter, a baseband signal generator, a phase-shifting signal generator and a phase-shifting modulator.
The pulse envelope period counter is used for forming a pulse envelope signal according to the radar waveform parameters and the walking parameters;
the baseband signal generator is used for forming a baseband signal according to the radar frequency and forming an output signal under the enabling action of the pulse envelope signal;
the phase-shifting signal generator is used for forming a phase-shifting signal according to the phase-shifting parameter;
and the phase-shifting modulator is used for performing complex multiplication modulation on the output signal and the phase-shifting signal to obtain a radar echo simulation signal.
Preferably, the pulse envelope period counter is configured to obtain an envelope period count and an inter-pulse envelope movement period count according to the pulse width parameter, the pulse fundamental period parameter, and the inter-pulse movement variation parameter, so as to obtain a pulse envelope signal.
Preferably, the baseband signal generator is specifically configured to output an I baseband signal and a Q baseband signal according to the pulse envelope signal to form an IQ baseband complex signal, where the I baseband signal, the Q baseband signal, and the IQ baseband complex signal are:
Si(t)＝cos(2πf·t)
Sq(t)＝sin(2πf·t)
Sb(t)＝exp[j·(2πf·t)]
si (t) is an I baseband signal, sq (t) is a Q baseband signal, sb (t) is an IQ baseband complex signal, f is pulse basic frequency and is obtained according to pulse basic period parameters, t is time, and j is an imaginary number unit.
Preferably, the phase-shift signal generator is configured to form an I-path phase-shift signal and a Q-path phase-shift signal according to the phase-shift parameter Δ t, and form a phase-shift signal of an IQ-phase-shift complex signal, where the phase-shift signals of the I-path phase-shift signal, the Q-path phase-shift signal, and the IQ-phase-shift complex signal are respectively:
Ip＝cos(2πf·Δt)
Qp＝sin(2πf·Δt)
Sb(Δt)＝exp[j·(2πf·Δt)]
wherein Ip is the I-path phase-shift signal, qp is the Q-path phase-shift signal, sb (delta t) is the IQ phase-shift complex signal, and delta t is the phase-shift time.
Preferably, the radar echo simulation signal is:
Sb(t+Δt)＝exp{j·[2πf·(t+Δt)]}
sb (t + Δ t) is a radar echo analog signal.
The invention also discloses a radar echo inter-pulse walking phenomenon simulation system which is characterized by comprising the radar echo inter-pulse walking phenomenon simulation device, a radar simulator control system, a digital up-converter and a radio frequency level frequency conversion module;
the radar simulator control system is used for forming radar waveform parameters and walking parameters and respectively transmitting the radar waveform parameters and the walking parameters to the pulse envelope period counter and the baseband signal generator, forming phase-shifting parameters and transmitting the phase-shifting parameters to the phase-shifting signal generator;
the digital up-converter is used for up-converting the radar echo analog signal;
and the radio frequency level frequency conversion module is used for carrying out radio frequency level frequency conversion on the radar echo simulation signal after the up-conversion processing to obtain a radio frequency signal corresponding to the radar receiver and sending the radio frequency signal to the radar receiver.
The invention also discloses a method for simulating the walking phenomenon between the radar echoes and the pulses, which comprises the following steps:
forming a pulse envelope signal according to the radar waveform parameters and the motion parameters;
forming a baseband signal according to the radar frequency, and forming an output signal under the enabling action of the pulse envelope signal;
forming a phase-shifting signal according to the phase-shifting parameter;
and performing complex multiplication modulation on the output signal and the phase-shifted signal to obtain a radar echo simulation signal.
Preferably, the method further comprises the following steps:
carrying out up-conversion processing on the radar echo analog signal;
and performing radio frequency level frequency conversion on the radar echo simulation signal subjected to the up-conversion processing to obtain a radio frequency signal corresponding to the radar receiver and sending the radio frequency signal to the radar receiver.
The forming a baseband signal according to the pulse envelope signal and the input signal specifically includes:
outputting an I baseband signal and a Q baseband signal according to the pulse envelope signal to form an IQ baseband complex signal, wherein the I baseband signal, the Q baseband signal and the IQ baseband complex signal are respectively:
Si(t)＝cos(2πf·t)
Sq(t)＝sin(2πf·t)
Sb(t)＝exp[j·(2πf·t)]
si (t) is an I baseband signal, sq (t) is a Q baseband signal, sb (t) is an IQ baseband complex signal, f is pulse fundamental frequency, the IQ baseband complex signal is obtained according to pulse fundamental period parameters, t is time, and j is an imaginary number unit.
Preferably, the forming the phase-shifted signal according to the phase-shifting parameter specifically includes:
forming an I-path phase-shift signal and a Q-path phase-shift signal according to the phase-shift parameter delta t, and forming a phase-shift signal of an IQ phase-shift complex signal, wherein the phase-shift signals of the I-path phase-shift signal, the Q-path phase-shift signal and the IQ phase-shift complex signal are respectively as follows:
Ip＝cos(2πf·Δt)
Qp＝sin(2πf·Δt)
Sb(Δt)＝exp[j·(2πf·Δt)]
wherein Ip is a phase-shifting signal of I path, qp is a phase-shifting signal of Q path, sb (delta t) is an IQ phase-shifting complex signal, and delta t is phase-shifting time;
the radar echo simulation signal is as follows:
Sb(t+Δt)＝exp{j·[2πf·(t+Δt)]}
sb (t + Δ t) is a radar echo analog signal.
The invention provides a novel inter-pulse walking simulation phenomenon simulation method, which aims at solving the problems that in a simulation system for radar system evaluation test in the prior art, inter-pulse walking simulation time granularity is too low and the existing requirements cannot be met. On the basis of ensuring the existing walking simulation time range, the simulation time granularity is improved to a technical index level superior to 3ns, the highest precision can reach 0.1ns, and the problem that the current radar echo pulse walking phenomenon cannot realize high-precision simulation is solved.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 is a diagram illustrating the envelope walk phenomenon of multiple echo pulses of a pulse Doppler radar in the prior art;
FIG. 2 is a block diagram of an exemplary embodiment of a radar echo interpulse walking phenomenon simulation apparatus according to the present invention;
FIG. 3 is a block diagram of a radar echo interpulse walking phenomenon simulation system according to an embodiment of the present invention;
fig. 4 is a structural diagram illustrating a method for simulating a radar echo inter-pulse walking phenomenon according to an embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the present invention, the present invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
According to one aspect of the invention, the embodiment discloses a radar echo inter-pulse walking phenomenon simulation device. As shown in fig. 2, in the present embodiment, the radar echo inter-pulse walking phenomenon simulation apparatus includes a pulse envelope period counter 1, a baseband signal generator 2, a phase-shift signal generator 3, and a phase-shift modulator 4.
The pulse envelope period counter 1 is used for forming a pulse envelope signal according to the radar waveform parameters and the ambulatory parameters.
The baseband signal generator 2 is configured to form a baseband signal according to the radar frequency, and form an output signal under the enabling action of the pulse envelope signal.
The phase-shift signal generator 3 is used for forming a phase-shift signal according to the phase-shift parameter.
And the phase-shifting modulator 4 is used for performing complex multiplication modulation on the output signal and the phase-shifting signal to obtain a radar echo analog signal.
The invention provides a novel inter-pulse walking simulation method aiming at the problems that in a simulation system for radar system evaluation test in the prior art, the granularity of inter-pulse walking simulation time is too low and the existing requirements cannot be met. On the basis of ensuring the existing walking simulation time range, the simulation time granularity is improved to a technical index level superior to 3ns, the highest precision can reach 0.1ns, and the problem that the walking phenomenon among the current radar echo pulses cannot realize high-precision simulation is solved.
In a preferred embodiment, the pulse envelope period counter 1 is configured to obtain an envelope period count and an inter-pulse envelope moving period count according to the pulse width parameter, the pulse fundamental period parameter, and the inter-pulse moving variation parameter, so as to obtain a pulse envelope signal. In one embodiment, the pulse width parameter, the pulse fundamental period parameter and the pulse-to-pulse variation parameter may be formed by the simulator control system and input to the pulse envelope period counter 1, the baseband signal generator 2 and the phase shift signal generator 3, respectively. The pulse envelope period counter 1 receives the pulse width parameter, the pulse basic period parameter and the pulse interval moving change parameter, and according to the parameters, the pulse envelope period counter 1 completes envelope period counting and pulse interval moving period counting. The counting time particles of the pulse envelope period counter 1 belong to coarse particles, the driving clock frequency is between 250MHz and 333MHz, preferably, the driving clock frequency is 333MHz, and the coarse time granularity is ensured to be 3ns. It should be noted that, in this embodiment, the radar waveform parameter and the coarse-grained walking parameter are formed by the simulator control system and transmitted to the pulse envelope period counter 1, the baseband signal generator 2 and the phase-shift signal generator 3, which are only described as examples, and in other embodiments, the pulse envelope period counter 1, the baseband signal generator 2 and the phase-shift signal generator 3 may also obtain the radar waveform parameter and the coarse-grained walking parameter by other means.
In a preferred embodiment, the output of the pulse envelope period counter 1 is the pulse envelope, going to the baseband signal generator 2 as an enable signal for the baseband signal generator 2, the baseband signal generator 2 forming a baseband signal according to the radar frequency and outputting the signal under the enable control of the pulse envelope signal. The baseband signal generator 2 may form an IQ baseband signal according to a radar frequency, and the signal form includes a single-point frequency or a chirp radar model. The baseband signal generator 2 is specifically configured to form an I baseband signal and a Q baseband signal according to the radar frequency to form an IQ baseband complex signal, where the I baseband signal, the Q baseband signal, and the IQ baseband complex signal are:
Si(t)＝cos(2πf·t)
Sq(t)＝sin(2πf·t)
Sb(t)＝exp[j·(2πf·t)]
si (t) is an I baseband signal, sq (t) is a Q baseband signal, sb (t) is an IQ baseband complex signal, f is pulse basic frequency and is obtained according to pulse basic period parameters, t is time, and j is an imaginary number unit.
In a preferred embodiment, the phase-shift signal generator 3 is configured to form an I-path phase-shift signal and a Q-path phase-shift signal according to the phase-shift parameter Δ t, and form a phase-shift signal of an IQ-phase-shift complex signal, where the phase-shift signals of the I-path phase-shift signal, the Q-path phase-shift signal, and the IQ-phase-shift complex signal are respectively:
Ip＝cos(2πf·Δt)
Qp＝sin(2πf·Δt)
Sb(Δt)＝exp[j·(2πf·Δt)]
wherein Ip is the phase-shift signal of I path, qp is the phase-shift signal of Q path, sb (delta t) is the IQ phase-shift complex signal, and delta t is the phase-shift time.
The simulator control system further forms a phase shift parameter with a small variation value according to the pulse fundamental frequency, wherein the moving parameter of the coarse time particles is preferably 3ns as described above and is realized by a pulse envelope period counter 1, and the small variation value Δ t of the period cannot be accurately simulated by using the pulse envelope period counter 1. The period small change value Δ t preferably satisfies | Δ t | <3ns, and the value of Δ t may be positive or negative. The time after the slight change is t + Δ t, and the signal which needs to be changed in time is obtained as follows:
Sb(t+Δt)＝exp{j·[2πf·(t+Δt)]}＝exp{j·[2πf·t+2πf·Δt]}
the signal after a small time change has an additional phase 2 pi f · Δ t than the original signal. Then a phase 2 pi f t is added to the output signal exp j (2 pi f t) corresponding to a time variation of at on the output signal.
Continuing to decompose Sb (t + Δ t) yields:
Sb(t+Δt)＝exp[j·(2πf·t)]·exp[j·(2πf·Δt)]
the additional phase 2 pi f · Δ t can be modulated onto the output signal by complex multiplication with the output signal, and minor time-varying adjustments of the output signal are accomplished. Specifically, in a specific example, the simulator control system may calculate a phase shift value 2 pi f · Δ t according to a set minor variation value to obtain a phase shift parameter, and issue the phase shift parameter to the phase shift signal generator 3, where the phase shift signal generator 3 may generate a phase shift signal in an IQ mode:
Ip＝cos(2πf·Δt)
Qp＝sin(2πf·Δt)
wherein, 2 π f Δ t should be within [0,2 π ], otherwise, phase ambiguity will occur after exceeding, resulting in incorrect variation of actual time. If | Δ t | is between [0,3ns ], then the value of f should be: f >333MHz. Different Δ t value ranges correspond to different unambiguous frequency values.
Thus, in the preferred embodiment, the phase-shift modulator 4 performs complex multiplication modulation on the output signal and the phase-shifted signal to obtain a radar echo analog signal, adds an additional phase of the phase-shifted signal to the original output signal to complete analog simulation of a minute value of inter-pulse motion, and can realize a delay accuracy of Δ t =0.1ns in a range without phase ambiguity. Wherein, the radar echo simulation signal Sb (t + Δ t) = exp { j · [2 pi f · (t + Δ t) ] } can be obtained.
In summary, the invention firstly forms an output signal with coarse time granularity by a pulse envelope period counter 1 and a baseband signal generator 2, then delays the output signal with coarse time granularity by a phase-shifting equivalent delay mode to obtain a high-precision radar echo simulation signal, and the output signal processed by 'coarse particle period walking + phase-shifting high-precision walking' perfectly simulates the high-precision simulation of the walking phenomenon between radar echo pulses. Furthermore, the high-precision simulation of the radar echo pulse-to-pulse walking phenomenon greatly improves the performance of radar echo simulation, particularly the performance of high-speed moving target echo signal simulation, the provided echo simulation signal can greatly improve the evaluation degree of a radar receiver, and sufficient conditions are provided for the development of subsequent radar receiver technologies.
It can be understood that the functions implemented by the pulse envelope period counter, the baseband signal generator, the phase shift signal generator and the phase shift modulator of the present invention are conventional technical means in the field, and those skilled in the art can set the specific structures of the pulse envelope period counter, the baseband signal generator, the phase shift signal generator and the phase shift modulator according to the needs in practical application to implement the radar echo pulse walking phenomenon simulation apparatus of the present invention, which is not described herein again. In a preferred embodiment, the pulse envelope period counter, the baseband signal generator, the phase shift signal generator and the phase shift modulator may each include a control chip, and the control of the operation process is implemented by the control chip. The control chip preferably selects an FPGA chip, and the digital processing platform based on the high-performance FPGA chip can effectively realize various indexes which can be achieved by the new method. The high-performance FPGA can be selected from Virtex6 series chips of Xilinx company, is produced and manufactured based on a 28nm logic process, and has a plurality of excellent performances. Specifically, the FPGA adopts a 28nm logic process, so that an internal clock network can work at a clock rate of 800MHz at most theoretically, and the realization of a counter function with a design value of 333MHz clock frequency can be completed by conveniently realizing an ultra-high speed data rate even if a delay introduced by combinational logic is added. The FPGA is internally integrated with a high-performance digital signal processing module DSP48E1, and the working speed of the FPGA can reach 600MHz to conveniently process ultrahigh-speed data. The DSP48E1 is internally integrated with high-performance digital processing components such as 1 25x18 multiplier, 1 48bits logic unit and the like, so that the functions of digital addition and multiplication, digital filtering, complex multiplication modulation and the like can be conveniently realized, and complex multiplication modulation of an additional phase is completed. The Virtex6 series of FPGAs also have abundant programmable logic resources and interfaces, and completely meet the use requirements in logic control.
The pulse envelope period counter 1 further comprises a binary digital counter, the driving clock frequency of the binary digital counter is designed to be 333MHz, and the coarse time grain precision of the envelope period moving 3ns between pulses can be realized. The counter can be externally provided with a comparator, outputs a pulse envelope signal meeting the parameters and goes to the baseband signal generator 2.
The baseband signal generator 2 adopts a DDS architecture based on Cordic algorithm. The DDS framework has the advantages of extremely high frequency resolution, extremely high frequency switching speed (ns level), continuous phase during frequency switching, easy function expansion, full digitalization, easy integration and the like, and can conveniently realize signal forms of single carrier frequency, linear frequency modulation, frequency agility and the like. The Cordic algorithm is a commonly used trigonometric function calculation algorithm, has the advantages of simple structure, high calculation precision and the like, and is widely applied to the field of digital signal processing at present. A Cordic algorithm unit in the DDS calculates sine and cosine function values corresponding to real-time phases, and output signals are sine and cosine signal waveforms required on a time axis. Only an adder and a shift register are needed in the Cordic algorithm structure, a single Cordic algorithm hardware module consumes few resources in the FPGA, and the resource consumption after multiplexing for multiple times is controlled in a relatively small range. The calculation precision of the Cordic algorithm is determined by the internal rotation calculation period, on the premise that the calculation time is guaranteed, the precision of the output signal of the Cordic algorithm can reach the precision result of the traditional waveform storage mode, and the indexes of the frequency, the amplitude resolution, the signal-to-noise ratio, the stray and the like of the final output signal are guaranteed.
The phase shift signal generator 3 also uses a Cordic algorithm to calculate sine and cosine function values corresponding to the phase shift phase, and a phase value caused by small time change transmitted by the radar simulator control system 7 is sent to the post-stage phase shift modulator 4 after the sine and cosine function values are calculated by the Cordic algorithm module. The phase-shifting modulator 4 uses a complex-domain multiplier to complete the operation of the phase-shifted signal, and the phase-shifting modulator 4 may include 4 multiplier modules and 2 adder modules to implement the complete complex-domain multiplication.
In a preferred embodiment, the radar echo inter-pulse walking phenomenon simulation device is arranged in a radar echo inter-pulse walking phenomenon simulation system. A pulse envelope period counter 1, a baseband signal generator 2 and a phase-shifting signal generator 3 of the radar echo inter-pulse walking phenomenon simulation device receive radar waveform parameters and coarse-grain walking parameters transmitted by a simulator control system and form radar echo simulation signals.
The radar echo inter-pulse walking phenomenon simulation system can comprise a radar simulator control system 7, a digital up-converter 5 and a radio frequency stage frequency conversion module 6.
The radar simulator control system 7 is used for forming radar waveform parameters and walking parameters and transmitting the radar waveform parameters and the walking parameters to the pulse envelope period counter 1, transmitting radar frequency to the baseband signal generator 2, forming phase shift parameters and transmitting the phase shift parameters to the phase shift signal generator 3.
The digital up-converter 5 is used for performing up-conversion processing on the radar echo analog signal.
And the radio frequency level frequency conversion module 6 is used for performing radio frequency level frequency conversion on the radar echo simulation signal subjected to the up-conversion processing to obtain a radio frequency signal corresponding to the radar receiver and sending the radio frequency signal to the radar receiver.
It can be understood that the radar echo analog signal obtained after the inter-pulse walk processing is converted into a radio frequency signal corresponding to the radar transmitting frequency through the post-stage up-conversion and radio frequency stage frequency conversion module 6, and is transmitted to the radar receiver for evaluation test.
Based on the same principle, the invention also discloses a radar echo inter-pulse walking phenomenon simulation system. In the present embodiment, as shown in fig. 3, the system includes the radar echo inter-pulse walking phenomenon simulation apparatus, a radar simulator control system 7, a digital up-converter 5 and an rf stage frequency conversion module 6.
The radar simulator control system 7 is configured to form radar waveform parameters and coarse-grained walking parameters, transmit the radar waveform parameters and the coarse-grained walking parameters to the pulse envelope period counter 1, transmit a radar frequency to the baseband signal generator 2, form phase shift parameters, and transmit the phase shift parameters to the phase shift signal generator 3.
The digital up-converter 5 is used for performing up-conversion processing on the radar echo analog signal.
And the radio frequency level frequency conversion module 6 is used for performing radio frequency level frequency conversion on the radar echo simulation signal after the up-conversion processing to obtain a radio frequency signal corresponding to the radar receiver and sending the radio frequency signal to the radar receiver.
Based on the same principle, the embodiment also discloses a method for simulating the walking phenomenon between the radar echoes and the pulses. As shown in fig. 4, in this embodiment, the method includes:
s100: and forming a pulse envelope signal according to the radar waveform parameters and the ambulation parameters.
S200: and forming a baseband signal according to the radar frequency, and forming an output signal under the enabling action of the pulse envelope signal.
S300: and forming a phase-shifted signal according to the phase-shifting parameter.
S400: and performing complex multiplication modulation on the output signal and the phase-shifted signal to obtain a radar echo simulation signal.
In a preferred embodiment, the method further comprises:
s500: and carrying out up-conversion processing on the radar echo analog signal.
S600: and performing radio frequency level frequency conversion on the radar echo simulation signal subjected to the up-conversion processing to obtain a radio frequency signal corresponding to the radar receiver and sending the radio frequency signal to the radar receiver.
In a preferred embodiment, the S200 may specifically include:
s210: outputting an I baseband signal and a Q baseband signal according to the pulse envelope signal to form an IQ baseband complex signal, wherein the I baseband signal, the Q baseband signal and the IQ baseband complex signal are respectively:
Si(t)＝cos(2πf·t)
Sq(t)＝sin(2πf·t)
Sb(t)＝exp[j·(2πf·t)]
si (t) is an I baseband signal, sq (t) is a Q baseband signal, sb (t) is an IQ baseband complex signal, f is pulse basic frequency and is obtained according to pulse basic period parameters, t is time, and j is an imaginary number unit.
In a preferred embodiment, the S300 may specifically include:
s310: forming an I-path phase-shift signal and a Q-path phase-shift signal according to the phase-shift parameter delta t, and forming a phase-shift signal of an IQ phase-shift complex signal, wherein the phase-shift signals of the I-path phase-shift signal, the Q-path phase-shift signal and the IQ phase-shift complex signal are respectively as follows:
Ip＝cos(2πf·Δt)
Qp＝sin(2πf·Δt)
Sb(Δt)＝exp[j·(2πf·Δt)]
wherein Ip is the phase-shift signal of I path, qp is the phase-shift signal of Q path, sb (delta t) is the IQ phase-shift complex signal, and delta t is the phase-shift time.
The radar echo simulation signal is:
Sb(t+Δt)＝exp{j·[2πf·(t+Δt)]}
sb (t + Δ t) is a radar echo analog signal.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art to which the present application pertains. Any modification, equivalent replacement, improvement or the like made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.
Claims (5)
1. A radar echo pulse-to-pulse walking phenomenon simulation device is characterized by comprising a pulse envelope period counter, a baseband signal generator, a phase-shifting signal generator and a phase-shifting modulator;
the pulse envelope period counter is used for forming a pulse envelope signal according to the radar waveform parameters and the walking parameters;
the baseband signal generator is used for forming a baseband signal according to the radar frequency and forming an output signal under the enabling action of the pulse envelope signal;
the phase-shifting signal generator is used for forming a phase-shifting signal according to the phase-shifting parameter;
the phase-shifting modulator is used for carrying out complex multiplication modulation on the output signal and the phase-shifting signal to obtain a radar echo simulation signal;
the baseband signal generator is specifically configured to output an I baseband signal and a Q baseband signal according to the pulse envelope signal to form an IQ baseband complex signal, where the I baseband signal, the Q baseband signal, and the IQ baseband complex signal are respectively:
Si(t)＝cos(2πf·t)
Sq(t)＝sin(2πf·t)
Sb(t)＝exp[j·(2πf·t)]
si (t) is an I baseband signal, sq (t) is a Q baseband signal, sb (t) is an IQ baseband complex signal, f is pulse fundamental frequency, the IQ baseband complex signal is obtained according to pulse fundamental period parameters, t is time, and j is an imaginary number unit;
the phase-shift signal generator is used for forming an I-path phase-shift signal and a Q-path phase-shift signal according to a phase-shift parameter delta t and forming a phase-shift signal of an IQ phase-shift complex signal, wherein the phase-shift signals of the I-path phase-shift signal, the Q-path phase-shift signal and the IQ phase-shift complex signal are respectively as follows:
Ip＝cos(2πf·Δt)
Qp＝sin(2πf·Δt)
Sb(Δt)＝exp[j·(2πf·Δt)]
wherein Ip is a phase-shifting signal of I path, qp is a phase-shifting signal of Q path, sb (delta t) is an IQ phase-shifting complex signal, and delta t is phase-shifting time;
the radar echo simulation signal is as follows:
Sb(t+Δt)＝exp{j·[2πf·(t+Δt)]}
sb (t + Δ t) is a radar echo analog signal.
2. The radar echo interpulse walking phenomenon simulation apparatus according to claim 1, wherein the pulse envelope period counter is configured to obtain an envelope period count and an interpulse envelope walking period count according to the pulse width parameter, the pulse fundamental period parameter and the interpulse walking variation parameter to obtain the pulse envelope signal.
3. A radar echo inter-pulse walking phenomenon simulation system, which is characterized by comprising a radar echo inter-pulse walking phenomenon simulation device, a radar simulator control system, a digital up-converter and a radio frequency level frequency conversion module according to any one of claims 1-2;
the radar simulator control system is used for forming radar waveform parameters and walking parameters, transmitting the radar waveform parameters and the walking parameters to the pulse envelope cycle counter, transmitting radar frequency to the baseband signal generator, forming phase-shifting parameters and transmitting the phase-shifting parameters to the phase-shifting signal generator;
the digital up-converter is used for up-converting the radar echo analog signal;
and the radio frequency level frequency conversion module is used for carrying out radio frequency level frequency conversion on the radar echo simulation signal after the up-conversion processing to obtain a radio frequency signal corresponding to the radar receiver and sending the radio frequency signal to the radar receiver.
4. A method for simulating a radar echo inter-pulse walking phenomenon is characterized by comprising the following steps:
forming a pulse envelope signal according to the radar waveform parameters and the motion parameters;
forming a baseband signal according to the radar frequency, and forming an output signal under the enabling action of the pulse envelope signal;
forming a phase-shifting signal according to the phase-shifting parameter;
carrying out complex multiplication modulation on the output signal and the phase-shifted signal to obtain a radar echo simulation signal;
forming a baseband signal according to the pulse envelope signal and the input signal specifically includes:
outputting an I baseband signal and a Q baseband signal according to the pulse envelope signal to form an IQ baseband complex signal, wherein the I baseband signal, the Q baseband signal and the IQ baseband complex signal are respectively:
Si(t)＝cos(2πf·t)
Sq(t)＝sin(2πf·t)
Sb(t)＝exp[j·(2πf·t)]
si (t) is an I baseband signal, sq (t) is a Q baseband signal, sb (t) is an IQ baseband complex signal, f is pulse fundamental frequency, the IQ baseband complex signal is obtained according to pulse fundamental period parameters, t is time, and j is an imaginary number unit;
the forming of the phase-shifted signal according to the phase-shifting parameter specifically includes:
forming an I-path phase-shift signal and a Q-path phase-shift signal according to the phase-shift parameter delta t, and forming a phase-shift signal of an IQ phase-shift complex signal, wherein the phase-shift signals of the I-path phase-shift signal, the Q-path phase-shift signal and the IQ phase-shift complex signal are respectively as follows:
Ip＝cos(2πf·Δt)
Qp＝sin(2πf·Δt)
Sb(Δt)＝exp[j·(2πf·Δt)]
wherein Ip is a phase-shifting signal of I path, qp is a phase-shifting signal of Q path, sb (delta t) is an IQ phase-shifting complex signal, and delta t is phase-shifting time;
the radar echo simulation signal is as follows:
Sb(t+Δt)＝exp{j·[2πf·(t+Δt)]}
sb (t + Δ t) is a radar echo analog signal.
5. The method of claim 4, further comprising:
carrying out up-conversion processing on the radar echo simulation signal;
and performing radio frequency level frequency conversion on the radar echo simulation signal subjected to the up-conversion processing to obtain a radio frequency signal corresponding to the radar receiver and sending the radio frequency signal to the radar receiver.
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