CN109188374B - Complex system radar full-pulse digital generation method based on top pulse - Google Patents

Complex system radar full-pulse digital generation method based on top pulse Download PDF

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CN109188374B
CN109188374B CN201810823641.5A CN201810823641A CN109188374B CN 109188374 B CN109188374 B CN 109188374B CN 201810823641 A CN201810823641 A CN 201810823641A CN 109188374 B CN109188374 B CN 109188374B
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CN109188374A (en
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姚金宝
肖鹏
赵亮
刘小亮
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CETC 29 Research Institute
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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
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Abstract

The invention relates to the technical field of system simulation, and discloses a complex system radar full-pulse digital generation method based on top pulse. The method comprises the following steps: defining a first arrival pulse in a radar signal pulse sequence as a most front pulse of the radar signal, and searching the most front pulse of the radar signal which arrives at the first in a simulated scene; storing the description word parameter of the first pulse of the first radar signal into a staggered pulse list to be output, and calculating to generate staggered pulses; updating the arrival time of the leading edge of the foremost pulse of the radar signal; correcting the leading edge arrival time of the foremost pulse of the radar signal aiming at the radar signal transmission delay time; updating the PDW parameter of the most front pulse of the radar signal; and (5) dynamically calculating to complete full pulse digital generation. The invention comprehensively considers the influence of the radar antenna scanning on whether the pulse is generated or not, the pulse amplitude and the influence of the electromagnetic wave space transmission delay on the pulse arrival time, and has the characteristics of strong expandability, high simulation fidelity, high operation speed and the like.

Description

Complex system radar full-pulse digital generation method based on top pulse
Technical Field
The invention relates to the technical field of system simulation, in particular to a complex system radar full-pulse digital generation method based on top pulse.
Background
Due to the complexity of the electromagnetic environment of modern battlefield and the dependence of the training of electronic countermeasure equipment on the environment, it is necessary to realize the simulation of radar signal scenes with different densities and complex systems. The current radar signal waveform modeling mode mainly comprises a characteristic parameter mode and a pulse sequence mode. The modeling mode has super real-time advantages in calculation, but can only support function level simulation, and is poor in verisimilitude; the pulse sequence mode can realize the realistic simulation of a real staggered pulse sequence and can support pulse-level simulation, but the modeling mode can generate a large amount of full-pulse data, the dynamic real-time increase can be realized, the sequencing algorithm is complex, the calculation amount is large, the real-time simulation generation through a commercial computer is difficult, and the real-time simulation generation through a DSP is often required.
In order to solve the above problems, a pulse group parameter mode is proposed at present, and the modeling mode is a group statistical description mode, and all pulses generated by each radar signal in each simulation beat are respectively regarded as a group of signals with conventional pulse characteristics. The performance of the modeling mode is between that of a characteristic parameter mode and that of a pulse sequence mode, and because radar signals in a group are all regarded as conventional pulses, the implementation of a sequencing algorithm is relatively simple, but because of the limitation of simulation beats (microsecond level is difficult to achieve), full-pulse simulation of complex system signals such as frequency agility and frequency hopping cannot be supported.
In addition, most of the existing radar signal waveform modeling modes do not consider the influence of radar signal space transmission delay on full pulse generation, so that the reality of the generated cross pulse is poor.
Therefore, in the aspect of research on generation of multiple radar full-pulse numbers with different densities in a complex system, the problems of complex sequencing algorithm, large calculation amount, poor verisimilitude and the like still exist, and continuous research and research are needed.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the existing problems, a complex system radar full-pulse digital generation method based on the top pulse is provided.
The technical scheme adopted by the invention is as follows: a complex system radar full-pulse digital generation method based on top pulse specifically comprises the following processes: step 1, defining a first arriving pulse in a radar signal pulse sequence as a forefront pulse of a radar signal, and searching the forefront pulse of the radar signal arriving firstly in a simulation scene; step 2, storing the description word parameter of the first pulse of the first radar signal into a staggered pulse list to be output, and calculating to generate staggered pulses; step 3, updating the leading edge arrival time of the foremost pulse of the radar signal; step 4, correcting the arrival time of the leading edge of the top pulse of the radar signal aiming at the radar signal transmission delay time; step 5, updating the PDW parameter of the most front pulse of the radar signal; and 6, dynamically calculating to complete the generation of the full pulse number.
Further, the specific process of step 1 is as follows: step 11, defining the first arrival pulse in the radar signal pulse sequence as the top pulse of the radar signal, wherein the descriptor word parameter of the top pulse comprises the leading edge arrival time TOA of the top pulseiCarrier frequency RFiPulse repetition period PRIiPulse width PWiPulse amplitude PAiWhere i is 0, 1, …, infinity, the number of the radar signal; step 12, calculating the time of arrival (TOA) of the leading edge of the top pulse of all radar signals in the simulated sceneiFinding the minimum time of arrival (TOA)j(j ∈ {0, 1,. and ∞ }), and the corresponding radar signal j is the leading pulse of the first-arriving radar signal.
Further, in step 2, the time TOA of the leading edge of the top pulse of radar signal j is obtainediCarrier frequency RFiPulse repetition period of PRIiPulse width PWiPulse amplitude PAiSaving the pulse sequence into the interleaved pulse list to be output to complete TOAjAll interleaved pulses prior to the time instant are computationally generated.
Further, the specific process of step 3 is as follows: step 31, according to
Figure BDA0001741929010000031
Wherein k is a current pulse number, belongs to k {0, 1., ∞ }, and corresponds to a most advanced pulse of a radar signal j when k is 0; TOA j，0Is the leading edge arrival time of the 0 th possible arrival pulse, i.e., the leading edge arrival time TOA of the foremost pulse of radar signal jj；TOAj，k+1、TOAj，kAre respectively the kthK +1 leading edge arrival times of possible arrival pulses; PRIj，kThe time interval between the k, k +1 th possible arrival pulse; continuously and iteratively calculating the time TOA of the leading edge of the next possible arrival pulse of the radar signal jj，k+1(ii) a Step 32, verifying the calculated TOAj，k+1Whether an iteration condition is met, and when the scanning mode of the radar antenna is tracking, the iteration termination condition is
TOAj，k＜TOAj，k+1，
When the scanning mode of the radar antenna is circular scanning, the iteration termination condition is
Figure BDA0001741929010000032
When the scanning mode of the radar antenna is sector scanning, the iteration termination condition is
Figure BDA0001741929010000033
Or
Figure BDA0001741929010000034
Wherein, TjScanning period, W, of radar antenna corresponding to radar signal jjThe beam width, a, corresponding to radar signal jj，1Is the starting angle of fan sweep, a, corresponding to the radar signal jj，2And obtaining the leading edge arrival time of the updated leading pulse of the radar signal until the sector sweep termination angle corresponding to the radar signal j meets the iteration termination condition.
Further, the specific process of step 4 is as follows: calculating the radar signal transmission delay time td＝S/c×103And S is the distance between the radar and a radar detection target, c is the speed of light, and the arrival time of the leading edge of the leading pulse of the radar signal after correction is obtained by adding the transmission delay time to the arrival time of the leading edge of the leading pulse of the radar signal.
Further, in the step 5,the updated PDW parameters include carrier frequency RFjPulse repetition period PRIjPulse width PWjPulse amplitude PAjThe updating process of the frequency carrier is RFj′＝RFj+ Δ RF × Rand (-1, 1), the update process of the pulse repetition period is PRIj′＝PRIj+ Δ PRI × Rand (-1, 1), the pulse width PWjThe pulse amplitude is not changed, and the updating process of the pulse amplitude is
Figure BDA0001741929010000041
Wherein, TOA'j，RFj′、PRIj′，PWj′、PAj' the leading edge arrival time, carrier frequency, pulse repetition period, pulse width, pulse amplitude, RF, respectively, of the leading pulse of the updated radar signal jj、PRIj，PWj、PAjCarrier frequency, pulse repetition period, pulse width, and pulse amplitude of radar signal j before updating are respectively represented by Rand (-1, 1) in [ -1, 1]Random numbers, P, generated within the rangeattenThe signal power attenuation of radar signals in free space transmission is realized, and S is the distance between a radar and a radar detection target; y (x) represents radar antenna pattern data, x ∈ [ -180 °, 180 °]。
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that: the invention adopts the first pulse algorithm which is a pulse level simulation and is used for the full pulse digital generation of radar signals of a plurality of complex systems. The method comprises the following specific steps:
a) The expandability is strong: the algorithm can be suitable for full-pulse digital generation of various radar signals with complex systems, and can be rapidly upgraded to be suitable for full-pulse digital generation of new radar signals with new systems in a battlefield. The algorithm can refer to the specific process in the step 5, and under the condition that the processing logic of the whole algorithm is not required to be modified, processing logic branches of corresponding radar signal patterns (including patterns of new system radar signals newly appearing in a battlefield) are additionally added in a manner similar to building blocks so as to update PDW parameters of the top pulses of the corresponding system radar signals, and full-pulse digital generation of various complex system radar signals is realized.
b) The simulation fidelity is high: according to the algorithm, the influence of radar antenna scanning on whether the pulse is generated and the pulse amplitude is introduced through the step 3 and the step 5, and the influence of the electromagnetic wave space transmission delay on the pulse arrival time is corrected through the step 4, so that the full pulse generated by simulation is higher in consistency with the full pulse in a real battlefield environment.
c) The operation speed is high: aiming at the battlefield environment with high pulse density (the battlefield environment contains 3 radar signals, wherein the pulse repetition periods of the radar signals 1, 2 and 3 are respectively 2 mus, 3 mus and 5 mus, and the pulse density is about 103.3 ten thousand pulses/second), the full-pulse digital generation method runs and tests the algorithm on a common commercial computer (Intel (R) core (TM)2Quad CPU, Q9650@3.00Hz), the time consumption test and the statistical averaging are carried out on the algorithm for multiple times, the result that 80ms of full pulse is generated in each calculation is obtained, the consumed time is about 13.5ms, and the test result shows that the algorithm has the super-real-time characteristic when being used for the full-pulse digital generation.
Drawings
Fig. 1 is a flow chart of the method for generating full-pulse digital radar with complex system at top pulse according to the present invention.
Detailed Description
All of the features disclosed in this specification, or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification may be replaced by alternative features serving an equivalent or similar purpose, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Referring to fig. 1, the method for generating full-pulse digital radar with complex system of top pulse specifically includes the following processes:
step 1, defining a first arriving pulse in a radar signal pulse sequence as a forefront pulse of a radar signal, and searching the forefront pulse of the radar signal arriving firstly in a simulation scene;
preferably, the specific process of step 1 is: defining a first arriving pulse in the radar signal pulse sequence as a top pulse of the radar signal, wherein a descriptor (PDW) parameter of the top pulse comprises a time of arrival (TOA) of a leading edge of the top pulse iCarrier frequency RFiPulse repetition period PRIiPulse width PWiPulse amplitude PAiWhere i ═ 0, 1, ·, ∞ is the number of the radar signal; step 12, calculating the time of arrival (TOA) of the leading edge of the top pulse of all radar signals in the simulated sceneiIn units of μ s, according to the formula
Figure BDA0001741929010000061
Minimum leading edge arrival time TOAjThe unit is μ s (j ∈ {0, 1., ∞ }, j is the number of all radar signals corresponding to the found first-arriving front pulse), and the corresponding radar signal j is the first-arriving front pulse of the radar signal.
Step 2, the description word (PDW) parameter (the leading edge arrival time TOA) of the first pulse of the first arrival radar signaljCarrier frequency RFjPulse width PWjPulse amplitude PAj) Storing the pulse signals into a staggered pulse list to be output, and calculating to generate TOAjStaggered pulses before the time instant. And the first pulse of the first-arriving radar signal is removed from the corresponding radar signal pulse train.
Step 3, updating the leading edge arrival time of the foremost pulse of the radar signal;
preferably, the specific process of step 3 is: step 31, according to
Figure BDA0001741929010000062
Wherein k is the current pulse number,k is an element of {0, 1, ·, ∞ }, and corresponds to the leading pulse of the radar signal j when k is 0; TOA j，0Is the leading edge arrival time of the 0 th possible arrival pulse, i.e., the leading edge arrival time TOA of the foremost pulse of radar signal jj；TOAj，k+1、TOAj，kThe leading edge arrival times of the k-th and k + 1-th possible arrival pulses respectively; PRIj，kIs the time interval between the kth, k +1 possible arriving pulses; continuously and iteratively calculating the time TOA of the leading edge of the next possible arrival pulse of the radar signal jj，k+1(influenced by the scanning mode of the radar antenna, not all pulses generated by the radar can reach the aperture of the receiving antenna of the radar detection target); step 32, verifying the calculated TOAj，k+1Whether an iteration condition is met or not, wherein the iteration termination condition is related to a radar antenna scanning mode (assuming that only a radar antenna main lobe and a first sub-lobe main beam irradiate a radar detection target, a radar detection target receiving antenna can receive radar pulses), and when the radar antenna scanning mode is tracking, the iteration termination condition is that
TOAj，k＜TOAj，k+1，
When the scanning mode of the radar antenna is circular scanning, the iteration termination condition is
Figure BDA0001741929010000071
When the scanning mode of the radar antenna is sector scanning, the iteration termination condition is
Figure BDA0001741929010000072
Or
Figure BDA0001741929010000073
Wherein, TjScanning period, W, of radar antenna corresponding to radar signal jjThe beam width (main lobe and first minor lobe width) a corresponding to the radar signal j j，1For radar signal jStarting angle of sweeping, aj，2The sector sweep termination angle corresponding to the radar signal j is obtained until the iteration termination condition is met, and when TOAj，k+1When any one of the above iteration termination conditions is satisfied, TOAj，k+1That is, the updated leading edge arrival time TOA of the first pulse of the radar signal is obtainedjAnd obtaining the arrival time of the leading edge of the first pulse of the updated radar signal.
Step 4, correcting the arrival time of the leading edge of the top pulse of the radar signal aiming at the radar signal transmission delay time;
because the relative distance between the radar and the radar detection target in the simulation scene changes, the radar signal transmission delay time tdWill affect the time of arrival TOA of the leading edge of the first pulse of the radar signaljPreferably, the specific process of step 4 is as follows: calculating the radar signal transmission delay time td＝S/c×103S is the distance between the radar and a radar detection target, and the unit is km; c is the speed of light and is 3.0 × 108m/s; and adding the transmission delay time to the leading edge arrival time of the top pulse of the radar signal to obtain the leading edge arrival time of the top pulse of the radar signal after correction.
Step 5, updating the PDW parameter of the most front pulse of the radar signal;
TOA due to radar working state switching, radar and radar detection target relative distance change and radar signal influence of complex system in simulation scene jThe signal parameters (including the PDW parameter of the top pulse) of the radar signal j reaching the aperture of the radar detection target receiving antenna at any time will change regularly, and need to be updated. Preferably, in the step 5, the updated PDW parameter includes a carrier frequency RFjPulse repetition period PRIjPulse width PWjPulse amplitude PAjThe updating process of the frequency carrier is RFj′＝RFj+ Δ RF × Rand (-1, 1), the update process of the pulse repetition period is PRIj′＝PRIj+ Δ PRI × Rand (-1, 1), the pulse width PWjThe pulse amplitude is not changed, and the updating process of the pulse amplitude is
Figure BDA0001741929010000081
Wherein, TOA'j，RFj′、PRIj′，PWj′、PAjRespectively representing the leading edge arrival time, the carrier frequency, the pulse repetition period, the pulse width and the pulse amplitude of the foremost pulse of the updated radar signal j, wherein the units are mus, MHz, mus and dBm; RF (radio frequency)j、PRIj，PWj、PAjCarrier frequency, pulse repetition period, pulse width, and pulse amplitude of radar signal j before updating are respectively represented by Rand (-1, 1) in [ -1, 1]Random numbers, P, generated within the rangeattenThe signal power attenuation of radar signals in free space transmission is realized, and S is the distance between a radar and a radar detection target; y (x) represents radar antenna pattern data, x ∈ [ -180 °, 180 °]。
And 6, the process of the steps 1-5 can realize the calculation generation of a single pulse, and the steps 1-5 are repeated to finish the digital generation of the full pulse of the complex system radar.
In order to verify the effectiveness of a top pulse method algorithm, a simulation scene containing three radars (signals generated by the three radars respectively correspond to a radar signal 1, a radar signal 2 and a radar signal 3, and the three radars are started simultaneously during experiments) and a detection target is constructed, wherein the radars and the detection target are relatively static, and the description of relevant parameters of the radars, the detection target and the like in the simulation scene is shown in a table 1 (the radar signals 2 and the radar signals 3 are radar signals of a complex system), and the top pulse method algorithm provided by the invention is applied to the generation of full pulse numbers reaching the aperture of a radar detection target receiving antenna in the simulation scene.
TABLE 1 description of relevant parameters such as radar in a simulated scene
Figure BDA0001741929010000091
And table 2 is a full pulse list of radar signals 1, 2 and 3 which are calculated by adopting the algorithm of the top pulse method provided by the invention and reach the aperture of the radar detection target receiving antenna.
TABLE 2 interlaced pulse parameter List generated by dynamic calculation of top pulse algorithm
Figure BDA0001741929010000092
Figure BDA0001741929010000101
It can be known from the observation table 2 that although the three radars are started at the same time, the three radar signals do not reach the aperture of the radar detection target receiving antenna at the same time due to the consideration of the influence of the electromagnetic wave space transmission delay on the pulse arrival time. By taking the pulse arrival time as an abscissa and the pulse amplitude as an ordinate, corresponding data in the table 2 is drawn and observed through Matlab, obvious periodic peak values (corresponding to the main lobe irradiating the aperture surface of the radar detection target receiving antenna) appear near the pulse arrival time of 1s and 3s, and the period is consistent with the preset circular scanning period in the table 1, so that the generated full pulse data reflects the scanning state and parameters of the antenna. Therefore, the full-pulse data pulse generated by the top-pulse algorithm is more practical and has higher fidelity.
In summary, core algorithm research, effect analysis and example verification show that the most advanced pulse method provided by the invention comprehensively considers whether pulse is generated or not by radar antenna scanning, the influence of pulse amplitude and the influence of electromagnetic wave space transmission delay on pulse arrival time, and has the characteristics of strong expandability, high operation speed, high simulation fidelity and the like.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification, and to any novel method or process steps or any novel combination of steps disclosed.

Claims (4)

1. A complex system radar full-pulse digital generation method based on top pulse is characterized by comprising the following steps: step 1, defining a first arriving pulse in a radar signal pulse sequence as a forefront pulse of a radar signal, and searching the forefront pulse of the radar signal arriving firstly in a simulation scene; step 2, storing the description word parameter of the first pulse of the first radar signal into a staggered pulse list to be output, and calculating to generate staggered pulses; step 3, updating the leading edge arrival time of the foremost pulse of the radar signal; step 4, correcting the leading edge arrival time of the foremost pulse of the radar signal aiming at the radar signal transmission delay time; step 5, updating the PDW parameter of the most front pulse of the radar signal; step 6, dynamically calculating to complete the generation of full pulse numbers;
The specific process of the step 3 is as follows: step 31, according to
Figure FDA0003684888400000011
Wherein k is the current pulse number, k belongs to {0,1, …, infinity }, and k is 0 and corresponds to the most advanced pulse of the radar signal j; TOAj,0Is the leading edge arrival time of the 0 th possible arrival pulse, i.e., the leading edge arrival time TOA of the leading pulse of radar signal jj；TOAj,k+1、TOAj,kThe leading edge arrival times of the kth and k +1 th possible arrival pulses respectively; PRIj,kThe time interval between the k, k +1 th possible arrival pulse; continuously iteratively calculating the leading edge arrival time TOA of the next possible arrival pulse of radar signal jj,k+1(ii) a Step 32, verifying the calculated TOAj,k+1Whether an iteration condition is met, and when the scanning mode of the radar antenna is tracking, the iteration termination condition is
TOAj,k<TOAj,k+1，
When the scanning mode of the radar antenna is circular scanning, the iteration termination condition is
Figure FDA0003684888400000012
When the scanning mode of the radar antenna is sector scanning, the iteration termination condition is
Figure FDA0003684888400000013
Or
Figure FDA0003684888400000014
Wherein, TjScanning period, W, of radar antenna corresponding to radar signal jjThe beam width, a, corresponding to radar signal jj,1Is the starting angle of fan sweep, a, corresponding to the radar signal jj,2Obtaining the leading edge arrival time of the updated leading pulse of the radar signal until the sector sweep termination angle corresponding to the radar signal j meets the iteration termination condition;
In the step 5, the updated PDW parameter includes a carrier frequency RFjPulse repetition period PRIjPulse width PWjPulse amplitude PAjThe updating process of the carrier frequency is RFj′＝RFj+ Δ RF × Rand (-1,1), the update process of the pulse repetition period is PRIj′＝PRIj+ Δ PRI × Rand (-1,1), the pulse width PWjThe pulse amplitude is not changed, and the updating process of the pulse amplitude is
Figure FDA0003684888400000021
Wherein, TOA'j，RFj′、PRIj′，PWj′、PAj' the leading edge arrival time, carrier frequency, pulse repetition period, pulse width, pulse amplitude, RF, respectively, of the leading pulse of the updated radar signal jj、PRIj，PWj、PAjCarrier frequency, pulse repetition period, pulse width, and pulse amplitude of radar signal j before updating are respectively represented by Rand (-1,1) in [ -1,1]Random numbers generated within the range, PattenThe signal power attenuation of radar signals in free space transmission is realized, and S is the distance between a radar and a radar detection target; y (x) denotes radarAntenna pattern data, x e-180 DEG, 180 DEG]。
2. The method for generating full-pulse digital signals of complex system radar based on the top pulse according to claim 1, wherein the specific process of the step 1 is as follows: step 11, defining the first arrival pulse in the radar signal pulse sequence as the top pulse of the radar signal, wherein the descriptor parameter of the top pulse comprises the leading edge arrival time TOA of the top pulse iCarrier frequency RFiPulse repetition period PRIiPulse width PWiPulse amplitude PAiWhere i is 0,1, …, infinity, the number of the radar signal; step 12, calculating the time of arrival (TOA) of the leading edge of the top pulse of all radar signals in the simulated sceneiThe minimum time of arrival TOA of the leading edge is obtainedj(j ∈ {0,1, …, infinity }), and the corresponding radar signal j is the first pulse of the first arriving radar signal.
3. The method for generating full-pulse digital radar based on complex system of top-pulse according to claim 2, wherein in step 2, the time of arrival TOA of the leading edge of the top-pulse of radar signal j isiCarrier frequency RFiPulse repetition period PRIiPulse width PWiPulse amplitude PAiSaving the pulse sequence into the interleaved pulse list to be output to complete TOAjAll interleaved pulses prior to the time instant are computationally generated.
4. The method for generating full-pulse digital signals of radar with complex systems based on top pulses according to claim 3, wherein the specific process of the step 4 is as follows: calculating the radar signal transmission delay time td＝S/c×103And S is the distance between the radar and a radar detection target, c is the speed of light, and the arrival time of the leading edge of the leading pulse of the radar signal after correction is obtained by adding the transmission delay time to the arrival time of the leading edge of the leading pulse of the radar signal.
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