CN110018449B - Signal synthesis method using envelope information - Google Patents
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- CN110018449B CN110018449B CN201910322324.XA CN201910322324A CN110018449B CN 110018449 B CN110018449 B CN 110018449B CN 201910322324 A CN201910322324 A CN 201910322324A CN 110018449 B CN110018449 B CN 110018449B
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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
Abstract
The invention relates to the field of radar target signal generation and simulation. Firstly, a user sets signal parameters through a parameter input interface provided by signal generation software; and finally, calling a multi-target waveform file through an arbitrary waveform generator to generate a multi-target analog signal. In the technical scheme of the invention, the pulse signal PRI is not adjusted and the signal space utilization rate is not calculated in the signal enveloping information processing and synthetic signal intra-pulse information processing processes, so that the signal generation time is saved, and the aim of quickly generating multi-target signals is fulfilled. Meanwhile, when the multi-target signal file is generated, the method of only storing signal sampling points and not storing idle sampling points is adopted, so that not only are hardware resources effectively utilized, but also the storage time is saved.
Description
Technical Field
The invention relates to the field of radar target signal generation and simulation, in particular to a signal synthesis method using envelope information.
Background
Modern radar systems are comprehensive in function and complex in performance, and can scan, track, identify and guide striking of multiple targets simultaneously. In the development and test of radar systems, a proper target simulator is generally used for testing. The target simulator used at present only aims at certain specific targets, and the timeliness and effectiveness of the simulator output target need to be improved.
Disclosure of Invention
Accordingly, the present invention provides a method for rapidly generating multi-target signals and effectively utilizing hardware resources.
In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows: a signal synthesizing method using envelope information, comprising the steps of:
1) A user sets signal parameters and a storage space RAM through a parameter input interface provided by signal generation software;
2) Envelope information after multi-target signal synthesis and an envelope relation between a single signal and a synthesized signal are obtained through signal envelope information processing;
3) Adding intra-pulse modulation information to the synthesized signal through intra-pulse information processing of the synthesized signal to form a multi-target waveform file;
4) The arbitrary waveform generator generates a complete multi-target analog signal according to the multi-target waveform file.
Preferably, the signal parameters include the number of signals, delay of the signals, pulse width τ of the signals, pulse repetition interval PRI of the signals, intra-pulse modulation mode of the signals, and intra-pulse modulation parameters of the signals.
Preferably, the formula for converting the signal parameters from continuous time domain signal parameters to discrete time domain signal parameters is:
τ points ＝round((τ*f s )/N gran )*N gran ；
PRI points ＝round((PRI*f s )/N gran )*N gran ；
Delay points ＝round((Delay*f s )/N gran )*N gran ；
where τ is the signal pulse width, PRI is the signal pulse repetition interval, delay is the signal initial Delay, f s Is the system sampling rate, N gran For the granularity of the signals that the system can handle, τ points And PRI points Delay, which is the pulse width of the signal and the repetition interval of the signal after digitization and adjustment of the granularity relation points Discrete points of delay.
Preferably, the specific flow of signal envelope information processing is as follows:
step one, calculating a virtual memory space virt _ RAM according to a storage space RAM set by a user;
secondly, determining the starting mark position of the current signal segment according to the parameter information set by the user, and determining the starting time sequence position, the number of signals, the available storage space and the serial number of the signal segment of each signal in the current signal segment;
thirdly, determining the position of a signal ending mark, and counting the repetition times of each signal in the current signal segment, the time sequence information of each signal and the space occupied by the current signal segment;
and fourthly, repeating the first step to the third step until the RAM is used up.
Preferably, the virtual memory space calculation method is as follows:
virt _ RAM = RAM/(number of signal samples + number of idle samples));
the number of the signal samples is the number of the samples of the pulse width part in the signal, and the number of the idle samples is the number of the samples of the rest part except the pulse width in one pulse period.
Preferably, the specific process of the intra-pulse information processing of the synthesized signal is as follows:
step one, the total fragment number of the synthesized signal and the signal pulse number contained in each fragment are obtained through envelope information processing calculation;
secondly, defining the size of the array data as the number of points of each segment;
thirdly, reading envelope information stored after the envelope information is processed;
fourthly, according to the total signal number and the total pulse number in the segment, the amplitude information of each signal is superposed in the digital group data according to the time sequence;
and fifthly, after the superposition of each section of signals is finished, storing the signal fragments synthesized in the array data into a multi-target signal file, and emptying the array for next circulation.
Preferably, the arbitrary waveform generator generates an analog signal by using a digital-to-analog conversion method.
The invention has the following beneficial effects: in the technical scheme of the invention, the pulse signal PRI is not adjusted and the signal space utilization rate is not calculated in the signal envelope information processing and the synthetic signal intra-pulse information processing processes, so that the signal generation time is saved, and the aim of quickly generating the multi-target signal is fulfilled. Meanwhile, when the multi-target signal file is generated, the method of only storing signal sampling points and not storing idle sampling points is adopted, so that not only are hardware resources effectively utilized, but also the storage time is saved.
Drawings
FIG. 1 is a schematic diagram of single signal division according to the present invention;
FIG. 2 is a schematic diagram of signal synthesis using envelope information according to the present invention;
FIG. 3 is a flow chart of the present invention for synthesis using envelope information;
FIG. 4 is a schematic diagram of the pulse formation within a signal segment according to the present invention;
fig. 5 is a flow chart of the signal intra-pulse information processing of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The method for rapidly synthesizing the multi-target signals comprises the following specific steps: as shown in fig. 1, a single signal is first divided into two parts, a signal sample (pulse width part) and an idle sample (part remaining after the pulse width is removed in one pulse period), according to the characteristics of the single signal. Secondly, storing the signal sampling points in the RAM space, generating a multi-target signal file, and generating a signal configuration file at the same time. Then, an Arbitrary Waveform Generator (AWG) reads the multi-target signal file to generate a multi-target signal, reads signal sampling points and idle sampling points according to the signal configuration file to generate complete signal sampling points, downloads the complete signal sampling points into a memory, and outputs the multi-target analog signal through a digital-to-analog conversion method. The arbitrary waveform generator is a special arbitrary waveform generator or a signal generator with an arbitrary waveform generating function.
The multi-target signal file only stores the signal sampling points, and the idle sampling points are not stored, so that the storage space is saved. The signal configuration file comprises two parts of contents, wherein one part is the total number of the signal sampling points and the number of each signal sampling point, and the other part is the total number of the idle sampling points and the number of each idle sampling point; and the signals of the signal sampling points and the idle sampling points are alternately stored, namely, first signal sampling point information is stored, then first idle sampling point information is stored one bit behind the first signal sampling point information, then second signal sampling point information is stored one bit behind the first idle sampling point information, and then second idle sampling point information is stored one bit behind the second signal sampling point information until all information is stored.
Further, the multi-target signal synthesis principle is as follows: firstly, information parameters such as Delay, signal pulse width tau, signal pulse repetition interval PRI, signal amplitude signal intra-pulse modulation mode, signal intra-pulse modulation parameters and the like of each pulse signal are input through a user interface.
Then, since the signals processed by the method of the present invention are all discrete time domain signals, the continuous time signal parameters need to be converted into discrete time signal parameters. The relationship of the continuous-time signal to the discrete-time signal is:
τ points ＝round((τ*f s )/N gran )*N gran ；
PRI points ＝round((PRI*f s )/N gran )*N gran ；
Delay points ＝round((Delay*f s )/N gran )*N gran ；
where τ is the signal pulse width, PRI is the signal pulse repetition interval, delay is the signal initial Delay, f s Is the system sampling rate, N gran For the granularity of the signals that the system can handle, τ points And PRI points Delay, the pulse width of the signal after digitization and adjustment of the granularity relationship points Discrete number of points for delay.
Then, the plurality of signals are synthesized in the time domain. As shown in fig. 2, the signal S1 (t) and the signal S2 (t) are combined to generate a combined signal S (t). The envelope of the original signal is preserved during the time period in which only a single signal is pulsed, and the signal segment 2 in the composite signal S (t) only preserves the pulse 2 in the signal S1 (t), during which time period no pulse is generated in the signal S2 (t). And (3) performing signal envelope superposition in a time period when a plurality of signals simultaneously generate pulses, wherein the signal segment 1 and the signal segment 3 in the synthesized signal S (t) are signal envelope superposition parts, namely in the time period, the pulse signals of the signal S1 (t) and the signal S2 (t) are generated simultaneously or the pulse signal parts are generated simultaneously. Then, the number of signal segments in the synthesized signal S (t) is counted, and the number of sampling points included in each segment of the signal segment and the pulse timing information in the signal segment are counted. Finally, the intra-pulse modulation information is processed in the signal segment in the synthesized signal S (t) to form a signal waveform file, and a multi-target signal is generated through an arbitrary waveform generator. The processing mode of the synthesized signal S (t) and the intra-pulse modulation information is to calculate and obtain signal sampling points according to time and a system sampling rate, the signal waveform file is a signal configuration file, and the signal segments are multi-target signal files.
In the synthesis principle of the present invention, the type of signal to be synthesized is not limited to one type of signal, and the types of signals to be selected are various. The classification according to the pulse repetition frequency type comprises the following steps: conventional, erratic, jittering and sliding, the classification according to intra-pulse information includes: single frequency, diversity, LFM, NLFM, two phase encoding, and four phase encoding.
Further, as shown in fig. 3, the specific process of the fast multi-target signal synthesis is as follows: firstly, the signal generation software provides a parameter input interface, in this embodiment, the signal generation software is preferably W2261BP software, and a user inputs the number of signals, the Delay of the signals, the signal pulse width τ, the signal pulse repetition interval PRI, the signal intra-pulse modulation mode and the signal intra-pulse modulation parameters on the input interface, and sets the signal playing time or specifies the available space RAM of the signals. And then, judging whether the available storage space has space, and when the current storage space has space, carrying out circulating processing on the signal envelope information all the time until the current storage space is insufficient, namely when the current storage space has no space, finishing circulating to carry out intra-pulse information processing. When the current storage space has no space, the intra-pulse information processing is directly carried out. And after intra-pulse information processing, storing the signal sampling points of each signal segment in a waveform file.
When the rapid multi-target signal synthesis is carried out, the signal PRI is not adjusted, the signal space utilization rate is not calculated, and the signal generation time is saved. The signal envelope information processing is used for calculating envelope information after multi-target signal synthesis and envelope relation between single signals and synthesized signals. The function of the processing of the intra-pulse information of the synthesized signal is to add intra-pulse modulation information to the synthesized signal to form the final synthesized signal.
The specific process of signal envelope information processing is as follows: according to an actual storage space RAM specified by a user, calculating a virtual memory space virt _ RAM, wherein the virtual memory space calculating method only stores signal sampling points and does not store idle sampling points, and therefore the virtual memory space calculating method comprises the following steps:
virt _ RAM = RAM/(number of signal samples + number of idle samples));
then, the synthesized signals are time-sequenced. And determining the position of the start mark of the current signal segment and the position of the end mark of the current segment according to the information of the time sequence, the pulse width, the pulse period and the like of each signal. When determining the segment start position, parameters such as the start timing position of each signal in the current signal segment, the number of signals, the available storage space, and the sequence number of the signal segment need to be determined. When determining the signal end flag, the number of times of repetition of each signal in the current signal segment, the timing information of each signal, and the space occupied by the current signal segment need to be counted. So as to obtain the total number of the segments of the synthesized signal samples, the number of the signal samples of each segment, and the pulse timing information in each segment. The pulse timing information in each segment includes the number of each pulse signal contained in a certain synthesized segment and the timing position of each pulse signal in the synthesized segment. When a pulse signal is not contained in a certain synthesized segment, 0 is set. The pulse timing information within each segment is used for subsequent intra-pulse information processing.
As shown in fig. 4, the fact that a certain composite segment contains the number of each pulse signal means that the number of pulse signals generated in the signal segment by each signal is read, and the signal segment is terminated by a "segment start" flag to a "segment end" flag. The signal S3 (t) in the signal segment shown in fig. 4 has no pulse signal, so the number thereof is set to 0, the number of the signal S4 (t) in the signal segment is 3, and the number of the signal S5 (t) in the signal segment is 1.
The specific process of the signal intra-pulse information processing is as follows: and synthesizing the intra-pulse information of each signal according to the information obtained by processing the signal envelope information to form a multi-target waveform file. As shown in fig. 5, first, the total number of segments of the synthesized signal is calculated by a function, which represents a multi-signal time-domain rearrangement, in the envelope information processing, the pulse signals are arranged in the virtual memory space virt _ ram according to time sequence, the time sequence information of the synthesized signals is processed, meanwhile, the gain calculation is carried out on the synthesized signals, and the maximum amplitude of the synthesized signals is normalized to be 1.
Secondly, the data array is used for storing data samples, and the space size of the data array is the number of the samples of each signal segment. And then, synthesizing signal information into signal segments according to the parameters of each signal input by the user interface of the signal generation software, namely processing the total signal number and the total pulse number in the array data, and superposing the amplitude information of each signal in time sequence. And finally, after each section of signal is superposed, storing the signal fragments synthesized in the array data into a multi-target signal file, and then processing the next signal fragment.
Further, after the fast multi-target signal synthesis, the signal sample points of each signal segment are stored in the multi-target waveform file. And then, reading a file by the arbitrary waveform generator according to the number of signal samples of the signal segments, adding idle time according to the number of interval points between the signal segments, generating a complete pulse signal sampling point, and downloading the pulse signal sampling point into a memory. And finally, producing the multi-target analog signals required by the user by a digital-to-analog conversion method.
The multi-target signal synthesis method generates various types of target signals in a short time without adjusting the pulse signal PRI and calculating the signal space utilization rate in the whole multi-target signal synthesis process. Meanwhile, when the multi-target signal file is generated, the method of only storing the signal sampling points and not storing the idle sampling points is adopted, so that not only are hardware resources effectively utilized, but also the storage time is saved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (6)
1. A signal synthesizing method using envelope information, comprising the steps of:
1) Setting signal parameters through a parameter input interface provided by signal generation software by a user;
2) Envelope information after multi-target signal synthesis and an envelope relation between a single signal and a synthesized signal are obtained through signal envelope information processing;
3) Adding intra-pulse modulation information to the synthesized signal through intra-pulse information processing of the synthesized signal to form a multi-target waveform file;
4) Generating a multi-target analog signal by the arbitrary waveform generator according to the multi-target waveform file;
the arbitrary waveform generator generates an analog signal by adopting a digital-to-analog conversion method.
2. A signal synthesis method using envelope information according to claim 1, characterized in that: the signal parameters comprise the number of signals, the Delay of the signals, the pulse width tau of the signals, the pulse repetition interval PRI of the signals, the intra-pulse modulation mode of the signals and the intra-pulse modulation parameters of the signals.
3. A signal synthesis method using envelope information according to claim 1, characterized in that: the formula for converting the signal parameters from continuous time domain signal parameters to discrete time domain signal parameters is as follows:
τ points ＝round((τ*f s )/N gran )*N gran ；
PRI points ＝round((PRI*f s )/N gran )*N gran ；
Delay points ＝round((Delay*f s )/N gran )*N gran ；
where τ is the signal pulse width, PRI is the signal pulse repetition interval, delay is the signal Delay, f s Is the system sampling rate, N gran Granularity of signals, τ, that the system can handle points And PRI points Delay, the pulse width of the signal after digitization and adjustment of the granularity relationship points Discrete number of points for delay.
4. A signal synthesizing method using envelope information according to claim 1, wherein: the specific process of signal envelope information processing comprises the following steps:
step one, calculating a virtual memory space virt _ RAM according to a storage space RAM set by a user;
secondly, determining the starting mark position of the current signal segment according to the parameter information set by the user, and determining the starting time sequence position, the number of signals, the available storage space and the serial number of the signal segment of each signal in the current signal segment;
thirdly, determining the position of a signal segment ending mark, and counting the repetition times of each signal in the current signal segment, the time sequence information of each signal and the space occupied by the current signal segment;
and fourthly, repeating the first step to the third step until the RAM is used up.
5. A signal synthesis method using envelope information according to claim 4, characterized in that: the virtual memory space calculation method comprises the following steps:
virt _ RAM = RAM/(number of signal samples + number of idle samples));
the number of the signal samples is the number of the pulse width part samples in the signal, and the number of the idle samples is the number of the remaining part samples after the pulse width is removed in one pulse period.
6. A signal synthesis method using envelope information according to claim 1, characterized in that: the specific process of the information processing in the synthetic signal pulse comprises the following steps:
firstly, processing and calculating to obtain the total number of fragments of the synthesized signal and the number of signal pulses contained in each fragment through envelope information;
secondly, defining the size of the array data as the number of sampling points of each segment;
thirdly, reading envelope information stored after the envelope information is processed;
fourthly, according to the number of the total signals and the number of the total pulses in the segments, the amplitude information of each signal is superposed in the digital group data according to the time sequence;
and fifthly, after the superposition of each section of signals is finished, storing the signal fragments synthesized in the array data into the multi-target waveform file, and emptying the array for the next circulation.
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| CN109557516B (en) * | 2018-11-28 | 2022-08-30 | 四川九洲电器集团有限责任公司 | Method for quickly generating multi-target space signals |
| CN110261834B (en) * | 2019-07-19 | 2023-03-24 | 成都玖锦科技有限公司 | Method for improving quality of hybrid radar signal |
| CN113721205A (en) * | 2021-08-27 | 2021-11-30 | 四创电子股份有限公司 | Phased array radar target multi-target signal simulation method |
| CN114489919B (en) * | 2022-04-15 | 2022-07-01 | 中星联华科技（北京）有限公司 | Complex electromagnetic environment signal synthesis method and apparatus for signal playback device |
| CN116500568B (en) * | 2023-06-29 | 2023-10-13 | 成都华兴汇明科技有限公司 | Method and system for generating long-time dynamic multi-target overlapping signals |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN107589411B (en) | 2019-06-21 |
| CN110018449A (en) | 2019-07-16 |
| CN107589411A (en) | 2018-01-16 |
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