CN114442046A - Method, device, equipment and medium for generating modulation and selection separation radar waveform - Google Patents
Method, device, equipment and medium for generating modulation and selection separation radar waveform Download PDFInfo
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- CN114442046A CN114442046A CN202210084716.9A CN202210084716A CN114442046A CN 114442046 A CN114442046 A CN 114442046A CN 202210084716 A CN202210084716 A CN 202210084716A CN 114442046 A CN114442046 A CN 114442046A
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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
- G01S7/28—Details of pulse systems
- G01S7/282—Transmitters
Abstract
The invention discloses a method, a device, equipment and a medium for generating a modulation and separation radar waveform, wherein the method comprises the following steps: giving a basic waveform library and modulation parameters, wherein the basic waveform library comprises a plurality of basic waveform vectors; the method comprises the steps of taking a coherent processing interval as a period, expressing the pulse number of a transmitted pulse string signal in one coherent processing interval as M, decomposing the generation of each pulse in the pulse string signal into two processes of basic waveform selection and pulse modulation, selecting a basic waveform vector corresponding to each pulse from a basic waveform library, and modulating the basic waveform corresponding to the basic waveform vector by using modulation parameters to obtain the radar pulse signal to be transmitted currently. The method can select any basic waveform vector from the basic waveform library in the radar waveform generating process, and realizes the modulation of the basic waveform corresponding to the basic waveform vector by using the modulation parameter. Compared with the existing method, the method reduces the calculated amount and the transmission delay while supporting any waveform, provides a new scheme for software radar waveform generation, and meets the requirements of flexibly transforming and modulating the waveform.
Description
Technical Field
The invention relates to the technical field of radar waveform generation, in particular to a method, a device, equipment and a medium for generating a modulation and separation radar waveform.
Background
The software-defined radar is a software-defined radar system established on a general computing technology and a digital radio frequency technology, and becomes one of important directions for the development of future radar systems by the advantages of reconfigurable function, strong application flexibility, fast iterative upgrade and the like. In a software-based radar system, waveforms are used as an important resource, the detection capability and the interference resistance capability of the radar system are directly determined by the flexibility of the generation mode and the modulation pattern of the waveforms, the advantages of the software-based radar are exerted, and the key problem in the development of the software-based radar is to efficiently generate various required complex modulation waveforms.
The waveform generation of the modern radar system usually adopts a direct digital synthesis mode, which comprises two different implementation modes of phase accumulation-based and waveform storage-based direct reading, the type of the output waveform of the front part is fixed and limited, the support to a complex modulation mode is not flexible, and the real-time requirement on software calculation and data transmission is higher in the latter mode, so that the complexity of the radar system is improved. In order to fully exert the advantages of the software-based radar in the aspects of waveform optimization and generation processing, a more flexible radar waveform generation mode needs to be designed.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a method, a device, equipment and a medium for generating a modulation and separation radar waveform, which can realize the decoupling of waveform generation and waveform patterns, and the decoupling of waveform optimization/selection and waveform generation.
In order to achieve the technical purpose, the technical scheme provided by the invention is as follows:
in one aspect, the present invention provides a method for generating a tuning separation radar waveform, comprising:
giving a basic waveform library and modulation parameters, wherein the basic waveform library comprises a plurality of basic waveform vectors;
the method comprises the steps of taking a coherent processing interval as a period, expressing the pulse number of a transmitted pulse string signal in one coherent processing interval as M, decomposing the generation of each pulse in the pulse string signal into two processes of basic waveform selection and pulse modulation, selecting a basic waveform vector corresponding to each pulse from a basic waveform library, and modulating the basic waveform corresponding to the basic waveform vector by using modulation parameters to obtain the radar pulse signal to be transmitted currently.
Further, the basic waveform library of the present invention may be a dynamic waveform library, and the basic waveform vector included in the basic waveform library is dynamically changed. Preferably, the coherent processing interval is taken as a period, and the upper computer dynamically generates M basic waveform vectors according to the coherent processing interval in the dynamic waveform library, so as to generate the radar pulse signal to be transmitted currently.
Furthermore, the basic waveform library is a static waveform library, the static waveform library comprises a large number of basic waveform vectors, and M basic waveform vectors are randomly selected from the static waveform library by taking a coherent processing interval as a period and are used for generating the radar pulse signal to be transmitted currently.
Furthermore, the modulation parameters of the invention include amplitude, frequency offset, initial phase and repetition interval, and the modulation parameters are dynamically adjusted by taking coherent processing interval as a period.
Further, in the present invention, for the m-th pulse pm(t), decomposed into two processes, base waveform selection and pulse modulation, which are expressed as:
wherein:
is the o-th in the basic waveform library WmA vector of basic waveform
Corresponding basic waveform, basic waveform vector
Is that
A digitized representation; a ism、ΔfmAnd phimRespectively the amplitude, frequency offset and initial phase modulation parameters of the mth pulse; Δ tmThe relative offset of the start position of the mth pulse.
In another aspect, the present invention provides a modulation and separation radar waveform generating apparatus, including:
an input module for providing a base waveform library and modulation parameters, wherein the base waveform library comprises a plurality of base waveform vectors;
and the modulation module takes the coherent processing interval as a period, the pulse number of the transmitted pulse train signal in one coherent processing interval is represented as M, the generation of each pulse in the pulse train signal is decomposed into two processes of basic waveform selection and pulse modulation, a basic waveform vector corresponding to each pulse is selected from a basic waveform library, and modulation of the basic waveform corresponding to the basic waveform vector is realized by utilizing the modulation parameters to obtain the radar pulse signal to be transmitted currently.
Furthermore, the modulation and separation radar waveform generation device also comprises a cache module which caches M basic waveform vectors and modulation parameters from the input module by taking coherent processing intervals as a period; and the modulation module reads the corresponding basic waveform vector and the modulation parameter from the buffer module during each transmission.
Further, in the tuning separation radar waveform generating device, the basic waveform library may be a dynamic waveform library, and an upper computer of the dynamic waveform library dynamically generates M basic waveform vectors according to a coherent processing interval, so as to generate a radar pulse signal to be currently transmitted, with the coherent processing interval as a period.
Further, in the tuning and separating radar waveform generating device, the basic waveform library may be a static waveform library, the static waveform library includes a large number of basic waveform vectors, and M basic waveform vectors are randomly selected from the static waveform library by taking a coherent processing interval as a period, so as to generate a radar pulse signal to be currently transmitted.
The invention further provides computer equipment which comprises an upper computer and a lower computer, wherein the upper computer completes generation of a basic waveform library and modulation parameters, then updates the currently selected basic waveform vector and the current modulation parameters to the lower computer at coherent processing intervals, and the lower computer generates the current radar pulse signal to be transmitted in real time. Further, as will be appreciated by those skilled in the art, the computer device includes a display module and an interface module, which respectively enable the display and the transmission of data.
Compared with the prior art, the invention has the advantages that:
the method can select any basic waveform vector from the basic waveform library in the radar waveform generating process, realizes the modulation of the basic waveform corresponding to the basic waveform vector by using the modulation parameter, and has the characteristics of flexibility and real-time property. Compared with the existing method, the method reduces the calculated amount and the transmission delay while supporting any waveform, provides a new scheme for software radar waveform generation, and meets the requirements of flexibly transforming and modulating the waveform.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a flow chart of an embodiment of the present invention.
FIG. 2 is a diagram of an apparatus according to the present invention.
FIG. 3 is a diagram of an apparatus according to the present invention.
Detailed Description
For the purpose of promoting a clear understanding of the objects, aspects and advantages of the embodiments of the invention, reference will now be made to the drawings and detailed description, wherein there are shown in the drawings and described in detail, various modifications of the embodiments described herein, and other embodiments of the invention will be apparent to those skilled in the art. The exemplary embodiments of the present invention and the description thereof are provided to explain the present invention and not to limit the present invention.
In an embodiment of the present invention, a method for generating a tuning-separation radar waveform is provided, including:
giving a basic waveform library and modulation parameters, wherein the basic waveform library comprises a plurality of basic waveform vectors; the modulation parameters comprise amplitude, frequency offset, initial phase and repetition interval;
the method comprises the steps of taking a coherent processing interval as a period, expressing the pulse number of a transmitted pulse string signal in one coherent processing interval as M, decomposing the generation of each pulse in the pulse string signal into two processes of basic waveform selection and pulse modulation, selecting a basic waveform vector corresponding to each pulse from a basic waveform library, and modulating the basic waveform corresponding to the basic waveform vector by using modulation parameters to obtain the radar pulse signal to be transmitted currently.
In one embodiment, the base waveform library is a dynamic waveform library, and the base waveform vector included in the base waveform library changes dynamically. And taking the coherent processing interval as a period, and dynamically generating M basic waveform vectors by an upper computer according to the coherent processing interval in the dynamic waveform library, wherein the M basic waveform vectors are used for generating the radar pulse signal to be transmitted currently.
In an embodiment, the basic waveform library is a static waveform library, the static waveform library includes a large number of basic waveform vectors, and M basic waveform vectors are randomly selected from the static waveform library by taking a coherent processing interval as a period, and are used for generating a radar pulse signal to be transmitted currently.
In one embodiment, the modulation parameters are dynamically adjusted in a cycle of coherent processing intervals.
In the application background of a software radar system, coherent processing intervals are used as radar transmitted waveform updating periods, and transmitted pulse train signals in one CPI are abstractly described as waveform matrixes. The burst signal s (t) transmitted in a CPI can be generally expressed as
Wherein: m is the number of pulses; p is a radical ofm(t) is the mth pulse; t isrFor reference Pulse Repetition Interval (PRI), atWithin one CPI is a fixed value.
The generation and storage of waveforms in a software-based radar system is typically done digitally at a sampling rate fsDigitizing s (t) to obtain:
S＝[p0；p1；...；pM-1]
wherein S is a digitized representation of a burst signal S (t), pmFor the m-th pulse pm(t) the digitized representation, pmFurther can be expressed as
pm＝[pm(0),pm(1),...,pm(N-1)]
Conventional waveform generation approaches will typically be pmThe design is made as a whole and,
in one embodiment of the present invention, referring to FIGS. 1 and 2, p ismThe generation of (a) is decomposed into two processes of basic waveform selection and pulse modulation, which are called modulation separation for short. For the m-th pulse pm(t), decomposed into two processes, base waveform selection and pulse modulation, which are expressed as:
wherein:
is the o-th in the basic waveform library WmA vector of basic waveform
Corresponding basic waveform, basic waveform vector
Is that
A digitized representation; a ism、ΔfmAnd phimRespectively the amplitude, frequency offset and initial phase modulation parameters of the mth pulse; Δ tmIs the m < th > oneThe relative offset of the pulse start positions.
At a sampling rate fsTo pm(t) digital to obtain:
wherein:
n is the nth complex sampling point of the mth pulse, wherein N is 0,1,2,.., N-1, and N is the length of a single pulse; z is a radical ofm(n) is a complex exponential signal, TsIs a sampling interval, equal to 1/fs。
S can now be represented as an M × N two-dimensional waveform with the number of rows M being the number of pulses in one CPI. In the same way, the basic waveform
Or digitized as waveform vectors
If L basic waveform vectors are contained in the dynamic or static waveform library W, then
In the software radar design, a modulation and separation mode is adopted, a basic waveform library and modulation parameters can be generated by a computer upper computer, and then the basic waveform library and the modulation parameters are transmitted to a lower computer to complete modulation so as to generate a radar pulse signal to be transmitted currently.
In one embodiment, the present invention provides a modulation and separation radar waveform generating apparatus, including:
an input module for providing a base waveform library and modulation parameters, wherein the base waveform library comprises a plurality of base waveform vectors;
and the modulation module takes the coherent processing interval as a period, the pulse number of the transmitted pulse train signal in one coherent processing interval is represented as M, the generation of each pulse in the pulse train signal is decomposed into two processes of basic waveform selection and pulse modulation, a basic waveform vector corresponding to each pulse is selected from a basic waveform library, and modulation of the basic waveform corresponding to the basic waveform vector is realized by utilizing the modulation parameters to obtain the radar pulse signal to be transmitted currently.
In an embodiment, the tuning separation radar waveform generating device further includes a buffer module for buffering M basic waveform vectors and modulation parameters from the input module with coherent processing intervals as a cycle; and the modulation module reads the corresponding basic waveform vector and the modulation parameter from the buffer module during each transmission.
The implementation method of the functions of the modules can be implemented by the same method in the foregoing embodiments, and details are not repeated here.
The method decomposes the radar waveform generation process into two steps, the upper computer completes the generation of a basic waveform library and modulation parameters, then waveform data and parameter data are updated to the FPGA lower computer at coherent processing intervals, and the lower computer completes the final generation of the waveform in real time.
Referring to fig. 3, an embodiment of the present invention provides a computer device, which includes an upper computer and a lower computer, where the upper computer completes generation of a basic waveform library and modulation parameters, then updates a currently selected basic waveform vector and current modulation parameters to the FPGA lower computer at coherent processing intervals, and the lower computer generates a radar pulse signal to be currently transmitted in real time. As can be understood by those skilled in the art, the computer device comprises a display part and an interface part, which respectively realize the display and the transmission of data.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for generating a modulation and separation radar waveform, comprising:
giving a basic waveform library and modulation parameters, wherein the basic waveform library comprises a plurality of basic waveform vectors;
the method comprises the steps of taking a coherent processing interval as a period, representing the pulse number of a transmitted pulse train signal in one coherent processing interval as M, decomposing the generation of each pulse in the pulse train signal into two processes of basic waveform selection and pulse modulation, selecting a basic waveform vector corresponding to each pulse from a basic waveform library, and modulating a basic waveform corresponding to the basic waveform vector by using modulation parameters to obtain a radar pulse signal to be transmitted currently.
2. The method of claim 1, wherein the base waveform library is a dynamic waveform library, and a base waveform vector included in the base waveform library is dynamically changed.
3. The method according to claim 2, wherein the M basic waveform vectors are generated dynamically from the dynamic waveform library by the upper computer at coherent processing intervals for generating the radar pulse signal to be transmitted currently, in a cycle of coherent processing intervals.
4. The method according to claim 1, wherein the basic waveform library is a static waveform library, the static waveform library contains a plurality of basic waveform vectors, and M basic waveform vectors are randomly selected from the static waveform library in a period of coherent processing interval for generating the radar pulse signal to be currently transmitted.
5. The method of producing a tune-away radar waveform of claim 1,2, 3 or 4 wherein the modulation parameters include amplitude, frequency offset, initial phase and repetition interval, and wherein the modulation parameters are dynamically adjusted over a period of the coherent processing interval.
6. The method of producing a tune-away radar waveform of claim 5 wherein p is the m-th pulsem(t), decomposed into two processes, base waveform selection and pulse modulation, which are expressed as:
wherein:
is the o-th in the basic waveform library WmA vector of basic waveform
Corresponding basic waveform, basic waveform vector
Is that
A digitized representation; a ism、ΔfmAnd phimRespectively the amplitude, frequency offset and initial phase modulation parameters of the mth pulse; Δ tmThe relative offset of the start position of the mth pulse.
7. A tuning separation radar waveform generating apparatus, comprising:
an input module for providing a base waveform library and modulation parameters, wherein the base waveform library comprises a plurality of base waveform vectors;
and the modulation module takes the coherent processing interval as a period, the pulse number of the transmitted pulse train signal in one coherent processing interval is represented as M, the generation of each pulse in the pulse train signal is decomposed into two processes of basic waveform selection and pulse modulation, a basic waveform vector corresponding to each pulse is selected from a basic waveform library, and modulation of the basic waveform corresponding to the basic waveform vector is realized by utilizing the modulation parameters to obtain the radar pulse signal to be transmitted currently.
8. The tuning separation radar waveform generating apparatus according to claim 7, further comprising a buffering module for buffering the M basic waveform vectors and the modulation parameters from the input module in a cycle of the coherent processing interval; and the modulation module reads the corresponding basic waveform vector and the modulation parameter from the buffer module during each transmission.
9. The tuning separation radar waveform generating device according to claim 7, wherein the basic waveform library is a dynamic waveform library, and the dynamic waveform library dynamically generates M basic waveform vectors for generating the radar pulse signal to be currently transmitted according to coherent processing intervals by using the upper computer as a period.
10. The tune-separation radar waveform generating device according to claim 7, wherein the basic waveform library is a static waveform library, the static waveform library contains a plurality of basic waveform vectors, and M basic waveform vectors are randomly selected from the static waveform library for generating the radar pulse signal to be currently transmitted, with a period of the coherent processing interval.
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| CN115267686A (en) * | 2022-09-27 | 2022-11-01 | 烟台初心航空科技有限公司 | Radar communication integrated modulation signal generation method with low peak-to-average ratio characteristic |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115267686A (en) * | 2022-09-27 | 2022-11-01 | 烟台初心航空科技有限公司 | Radar communication integrated modulation signal generation method with low peak-to-average ratio characteristic |
| CN115267686B (en) * | 2022-09-27 | 2023-01-17 | 烟台初心航空科技有限公司 | Radar communication integrated modulation signal generation method with low peak-to-average ratio characteristic |
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