CN118091553B

CN118091553B - Generalized waveform description-based radar waveform generation method and apparatus

Info

Publication number: CN118091553B
Application number: CN202410508001.0A
Authority: CN
Inventors: 王磊; 刘一民; 张哲�; 孙仲文
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Filing date: 2024-04-25
Publication date: 2024-07-09
Anticipated expiration: 2044-04-25

Abstract

The application relates to a radar waveform generation method and device based on generalized waveform description, wherein the method comprises the following steps: establishing an inter-pulse waveform description word and an intra-pulse waveform description word which approximately describe any emitted waveform of the target radar so as to construct a generalized waveform description mechanism of the target radar; based on a generalized waveform description mechanism, acquiring an inter-pulse waveform description word and an intra-pulse waveform description word of each pulse signal in a current coherent processing interval to generate a baseband waveform sequence of the current coherent processing interval; and generating an analog domain baseband signal corresponding to the baseband waveform sequence through the baseband waveform sequence and the baseband modulation strategy, and generating a target transmitting signal of the target radar based on the inter-pulse waveform description word and the analog domain baseband signal and simultaneously combining the signal processing and filtering strategy. Therefore, the problems of low waveform generation efficiency, poor real-time performance, poor waveform type compatibility and the like in the conventional radar system waveform generation technology are solved.

Description

Generalized waveform description-based radar waveform generation method and apparatus

Technical Field

The application relates to the technical field of radar waveforms, in particular to a radar waveform generation method and device based on generalized waveform description.

Background

In recent years, electronic interference, particularly main lobe electronic interference, causes great trouble to radar detection, and becomes a bottleneck problem for restricting radar detection performance and threatening battlefield viability. Research shows that complex waveform technology featuring multidimensional agility and complex modulation is an effective means for resisting radar main lobe interference. Complex waveform technology gives radar a wider behavioral space, making the transmit waveform an increasingly important radar resource. Particularly, along with the rapid development of artificial intelligence technology, radar waveform countermeasure technology using intelligent waveform decision as a means is becoming a technical trend of radar main lobe interference resistance. However, the complex waveform and the intelligent decision technique thereof put higher requirements on the waveform generation capacity of the radar system, and the real-time waveform description and generation mode oriented to any waveform is an important foundation for the technique to go to practical application.

Currently, the actual radar system master can generate waveforms in two ways:

1. The digital waveform sequence is designed in advance and stored in a memory in the radar system, and when the radar transmits the waveform, the corresponding digital waveform is read according to the designed sequence and sent to a specific digital-to-analog conversion device to complete the waveform generation operation. The method has the problems that a large amount of storage space is consumed for storing the digital waveform sequence, the types of waveforms which can be stored in the limited space are very limited, and the radar waveform generation capacity is severely limited; meanwhile, as the scheme stores a digital waveform sequence, long access and communication transmission time are required to be spent when waveform calling and transmitting are carried out, and the instantaneity is poor;

2. Waveforms are described using description parameters for a particular waveform. For example, a chirp waveform may be described in terms of both time-width and chirp rate, while a phase-encoded waveform may be described by a set of phase-encoded sequences and corresponding chip widths. By adopting the parameter description mode, the radar waveform can be stored and transmitted aiming at the waveform description parameters, so that the waveform description and generation efficiency is greatly improved. However, since different waveform types have different characteristics, the corresponding waveform description parameters and dimensions cannot be compatible with each other, so that the waveform parameter description method can generally only be applied to a specific waveform type, for example, the parameter definition rule describing a chirped waveform is not applicable to phase encoding, and the description method of complex modulation waveforms such as a nonlinear chirped waveform is not discussed.

In summary, in the conventional radar system waveform generation technology, the waveform generation efficiency is low, the real-time performance is poor, and the waveform type compatibility is poor, which needs to be solved.

Disclosure of Invention

The application provides a radar waveform generation method and device based on generalized waveform description, which are used for solving the problems of low waveform generation efficiency, poor instantaneity, poor waveform type compatibility and the like in the conventional radar system waveform generation technology.

An embodiment of a first aspect of the present application provides a method for generating a radar waveform based on generalized waveform description, including the steps of: establishing an inter-pulse waveform description word and an intra-pulse waveform description word which approximately describe any emitted waveform of a target radar, and constructing a generalized waveform description mechanism of the target radar according to the inter-pulse waveform description word and the intra-pulse waveform description word; based on the generalized waveform description mechanism, acquiring the inter-pulse waveform description word and the intra-pulse waveform description word of each pulse signal in the current coherent processing interval of the target radar, so as to generate a baseband waveform sequence of the current coherent processing interval according to the inter-pulse waveform description word and the intra-pulse waveform description word; and obtaining an analog domain baseband signal corresponding to the baseband waveform sequence through the baseband waveform sequence and a baseband modulation strategy, and generating a target transmitting signal of the target radar based on the inter-pulse waveform description word and the analog domain baseband signal and simultaneously combining a signal processing strategy and a filtering strategy.

Optionally, in one embodiment of the present application, the establishing the inter-pulse waveform descriptor and the intra-pulse waveform descriptor that approximately describe the arbitrary transmit waveform of the target radar includes: calculating the total number of pulse signals in a preset coherent processing interval of the target radar, and acquiring the intra-pulse chip coding information of each pulse signal in the preset coherent processing interval; determining a radar waveform type of each pulse signal in the preset coherent processing interval according to the total number of the pulse signals, and establishing an inter-pulse waveform description word of each pulse signal in the preset coherent processing interval based on the radar waveform type and the intra-pulse chip coding information; and determining a baseband waveform corresponding to the intra-pulse chip coding information based on the intra-pulse chip coding information, and establishing an intra-pulse waveform description word of each pulse signal in the preset coherent processing interval according to the intra-pulse chip coding information and the baseband waveform.

Optionally, in one embodiment of the present application, the acquiring, based on the generalized waveform description mechanism, the inter-pulse waveform descriptor and the intra-pulse waveform descriptor of each pulse signal in a current coherent processing interval of the target radar to generate a baseband waveform sequence of the current coherent processing interval according to the inter-pulse waveform descriptor and the intra-pulse waveform descriptor includes: traversing each pulse signal in the current coherent processing interval, and reading carrier frequency information and pulse repetition period information of each pulse signal according to the inter-pulse waveform description word of each pulse signal; acquiring the starting frequency, the ending frequency, the amplitude and the phase of each chip corresponding to each pulse signal based on the pulse internal waveform description word of each pulse signal; generating an input sequence of a preset Cordic operator according to the initial frequency, the termination frequency, the amplitude and the phase, and calculating a sampling sequence of each chip through the preset Cordic operator; and generating a baseband waveform of each chip based on the carrier frequency information, the pulse repetition period information and the sampling sequence, and constructing a baseband waveform sequence of the current coherent processing interval according to the baseband waveform of each chip.

Optionally, in an embodiment of the present application, the obtaining, by the baseband waveform sequence and the baseband modulation strategy, an analog domain baseband signal corresponding to the baseband waveform sequence, and generating, based on the inter-pulse waveform description word and the analog domain baseband signal, a target transmission signal of the target radar by combining signal processing and filtering strategies, includes: based on the baseband modulation strategy, performing digital-to-analog conversion on the baseband waveform sequence to obtain the analog domain baseband signal; executing a preset signal local oscillation operation by using preset time sequence control information and the inter-pulse waveform description word to generate a radio frequency signal, and carrying out frequency mixing processing on the radio frequency signal and the analog domain baseband signal to generate a carrier frequency modulation signal; and performing band-pass filtering operation on the carrier frequency modulation signal to obtain a target output frequency signal in the carrier frequency modulation signal, and generating the target transmitting signal according to the target output frequency signal.

Optionally, in one embodiment of the present application, the mathematical expression of the analog domain baseband signal is:

wherein, Represent the firstThe analog domain baseband signal of each pulse signal; represents the first Chip time width of each pulse signal; Represent the first The starting frequency of the individual chips; represents the first The amplitude of the individual chips; represents the first Termination frequency of the individual chips; represents the first The phase of the individual chips; Representing a rectangular window function; represents the first The number of chips in the pulse signal; k represents the current chip sequence number; n is the serial number of the current pulse signal; representing the continuous domain time.

Optionally, in one embodiment of the present application, the mathematical expression of the target transmission signal is:

wherein, Representing the target transmit signal; representing a rectangular window function; i and n each represent a pulse signal sequence number; representing the pulse width of the nth pulse signal; Representing the analog domain baseband signal; a pulse repetition period representing the i-th pulse signal; Carrier frequency information representing each pulse signal, Representing the continuous domain time.

An embodiment of a second aspect of the present application provides a radar waveform generating apparatus based on generalized waveform description, including: the waveform description module is used for establishing an inter-pulse waveform description word and an intra-pulse waveform description word which approximately describe the random emission waveform of the target radar, and constructing a generalized waveform description mechanism of the target radar according to the inter-pulse waveform description word and the intra-pulse waveform description word; the signal modulation module is used for acquiring the inter-pulse waveform description word and the intra-pulse waveform description word of each pulse signal in the current coherent processing interval of the target radar based on the generalized waveform description mechanism so as to generate a baseband waveform sequence of the current coherent processing interval according to the inter-pulse waveform description word and the intra-pulse waveform description word; the waveform generation module is used for obtaining an analog domain baseband signal corresponding to the baseband waveform sequence through the baseband waveform sequence and the baseband modulation strategy, and generating a target transmitting signal of the target radar based on the inter-pulse waveform description word and the analog domain baseband signal and combining signal processing and filtering strategies.

Optionally, in one embodiment of the present application, the waveform description module includes:

The first acquisition unit is used for calculating the total number of pulse signals in a preset coherent processing interval of the target radar and acquiring intra-pulse chip coding information of each pulse signal in the preset coherent processing interval; the first establishing unit is used for determining the radar waveform type of each pulse signal in the preset coherent processing interval according to the total number of the pulse signals and establishing an inter-pulse waveform description word of each pulse signal in the preset coherent processing interval based on the radar waveform type and the intra-pulse chip coding information; and the second establishing unit is used for determining a baseband waveform corresponding to the intra-pulse chip coding information based on the intra-pulse chip coding information and establishing an intra-pulse waveform description word of each pulse signal in the preset coherent processing interval according to the intra-pulse chip coding information and the baseband waveform.

Optionally, in one embodiment of the present application, the signal modulation module includes: the traversing unit is used for traversing each pulse signal in the current coherent processing interval and reading carrier frequency information and pulse repetition period information of each pulse signal according to the inter-pulse waveform description word of each pulse signal; the second acquisition unit is used for acquiring the starting frequency, the ending frequency, the amplitude and the phase of each chip corresponding to each pulse signal based on the pulse internal waveform description word of each pulse signal; the computing unit is used for generating an input sequence of a preset Cordic operator according to the initial frequency, the end frequency, the amplitude and the phase, and computing a sampling sequence of each chip through the preset Cordic operator; and the construction unit is used for generating the baseband waveform of each chip based on the carrier frequency information, the pulse repetition period information and the sampling sequence, and constructing the baseband waveform sequence of the current coherent processing interval according to the baseband waveform of each chip.

Optionally, in one embodiment of the present application, the waveform generation module includes: the digital-to-analog conversion unit is used for carrying out digital-to-analog conversion on the baseband waveform sequence based on the baseband modulation strategy so as to acquire the analog domain baseband signal; the execution unit is used for executing a preset signal local oscillation operation by utilizing preset time sequence control information and the inter-pulse waveform description word to generate a radio frequency signal, and carrying out frequency mixing processing on the radio frequency signal and the analog domain baseband signal to generate a carrier frequency modulation signal; and the frequency selection unit is used for performing band-pass filtering operation on the carrier frequency modulation signal so as to acquire a target output frequency in the carrier frequency modulation signal and generating the target transmitting signal according to the target output frequency.

An embodiment of a third aspect of the present application provides an electronic device, including: the radar waveform generation system comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor executes the program to realize the radar waveform generation method based on the generalized waveform description as described in the embodiment.

A fourth aspect of the present application provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements the radar waveform generation method described above based on generalized waveform description.

Thus, embodiments of the present application have the following beneficial effects:

The embodiment of the application can construct a generalized waveform description mechanism of the target radar by establishing an inter-pulse waveform description word and an intra-pulse waveform description word which approximately describe the random emission waveform of the target radar and according to the inter-pulse waveform description word and the intra-pulse waveform description word; based on a generalized waveform description mechanism, acquiring an inter-pulse waveform description word and an intra-pulse waveform description word of each pulse signal in a current coherent processing interval of a target radar, so as to generate a baseband waveform sequence of the current coherent processing interval according to the inter-pulse waveform description word and the intra-pulse waveform description word; and obtaining an analog domain baseband signal corresponding to the baseband waveform sequence through the baseband waveform sequence and the baseband modulation strategy, and generating a target transmitting signal of the target radar based on the inter-pulse waveform description word and the analog domain baseband signal and simultaneously combining the signal processing and filtering strategy. The application greatly improves the compatibility of waveform types and effectively improves the generation efficiency of waveforms by making the conventional waveforms, the baseband complex waveforms and the inter-pulse complex modulation compatible to the same description method. Therefore, the problems of low waveform generation efficiency, poor real-time performance, poor waveform type compatibility and the like in the conventional radar system waveform generation technology are solved.

Additional aspects and advantages of the application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the application.

Drawings

The foregoing and/or additional aspects and advantages of the application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

fig. 1 is a flowchart of a radar waveform generation method based on generalized waveform description according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a waveform descriptor according to one embodiment of the present application;

FIG. 3 is a flow chart of a digital waveform generation process according to an embodiment of the present application;

fig. 4 (a) is a schematic diagram showing the approximate description of a non-chirped waveform;

fig. 4 (b) is a schematic diagram for describing arbitrary modulation waveform approximation;

FIG. 5 is a schematic diagram of a logic architecture of a method for generating radar waveforms based on generalized waveform descriptions according to an embodiment of the present application;

FIG. 6 is a schematic diagram of a radar waveform decision system according to an embodiment of the present application;

Fig. 7 is an exemplary diagram of a radar waveform generating apparatus described based on generalized waveforms according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

The system comprises a radar waveform generation device based on generalized waveform description, a 100-waveform description module, a 200-signal modulation module, a 300-waveform generation module, a 801-memory, an 802-processor and 803-communication interface.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present application and should not be construed as limiting the application.

The following describes a radar waveform generation method and apparatus based on generalized waveform description according to an embodiment of the present application with reference to the accompanying drawings. In order to solve the problems mentioned in the background art, the application provides a radar waveform generation method based on generalized waveform description, in the method, a generalized waveform description mechanism of a target radar is constructed according to an inter-pulse waveform description word and an intra-pulse waveform description word by establishing the inter-pulse waveform description word and the intra-pulse waveform description word which approximately describe the random emission waveform of the target radar; based on a generalized waveform description mechanism, acquiring an inter-pulse waveform description word and an intra-pulse waveform description word of each pulse signal in a current coherent processing interval of a target radar, so as to generate a baseband waveform sequence of the current coherent processing interval according to the inter-pulse waveform description word and the intra-pulse waveform description word; and obtaining an analog domain baseband signal corresponding to the baseband waveform sequence through the baseband waveform sequence and the baseband modulation strategy, and generating a target transmitting signal of the target radar based on the inter-pulse waveform description word and the analog domain baseband signal and simultaneously combining the signal processing and filtering strategy. The application greatly improves the compatibility of waveform types and effectively improves the generation efficiency of waveforms by making the conventional waveforms, the baseband complex waveforms and the inter-pulse complex modulation compatible to the same description method. Therefore, the problems of low waveform generation efficiency, poor real-time performance, poor waveform type compatibility and the like in the conventional radar system waveform generation technology are solved.

Specifically, fig. 1 is a flowchart of a radar waveform generating method based on generalized waveform description according to an embodiment of the present application.

As shown in fig. 1, the method for generating radar waveforms based on generalized waveform description includes the following steps:

In step S101, an inter-pulse waveform descriptor and an intra-pulse waveform descriptor that approximately describe the arbitrary transmission waveform of the target radar are created, and a generalized waveform description mechanism of the target radar is constructed from the inter-pulse waveform descriptor and the intra-pulse waveform descriptor.

It can be appreciated that the embodiment of the application can analyze the pulse signals of various types preset in the preset coherent processing intervals (Coherent Processing Interval, CPI) of the target radar, establish the inter-pulse waveform description word and the intra-pulse waveform description word of each type of pulse signals to construct a generalized waveform description mechanism, so as to be compatible with the conventional waveform (single frequency modulation, linear frequency modulation and the like), the baseband complex waveform (nonlinear frequency modulation, phase coding, frequency coding, amplitude coding, complex coding and the like) and the inter-pulse complex modulation at the same time, realize generalized description of any radar waveform, and provide a reliable technical basis for the subsequent intelligent radar waveform decision.

Optionally, in one embodiment of the present application, establishing an inter-pulse waveform descriptor and an intra-pulse waveform descriptor that approximately describe an arbitrary transmit waveform of the target radar includes: calculating the total number of pulse signals in a preset coherent processing interval of a target radar, and acquiring the intra-pulse chip coding information of each pulse signal in the preset coherent processing interval; determining the radar waveform type of each pulse signal in a preset coherent processing interval according to the total number of the pulse signals, and establishing an inter-pulse waveform description word of each pulse signal in the preset coherent processing interval based on the radar waveform type and the intra-pulse chip coding information; and determining a baseband waveform corresponding to the intra-pulse chip coding information based on the intra-pulse chip coding information, and establishing an intra-pulse waveform description word of each pulse signal in a preset coherent processing interval according to the intra-pulse chip coding information and the baseband waveform.

In a specific implementation process, the specific steps for realizing generalized description of radar waveforms in the embodiment of the application are as follows:

Step 1, establishing an inter-pulse waveform description word:

embodiments of the application may set a CPI in And transmit pulses. When (when)And then, representing the radar waveform of the continuous wave system; when (when)And then the radar waveform of the pulse system is represented.

In an embodiment of the present application, the carrier frequency of each pulse in the current CPI may be defined as、…、、…、Pulse repetition periods (Pulse Repetition Interval, PRI) of respectively、…、、…、Wherein whenWhen in use, then; When (when)When in use, thenIs the firstPulse start to the firstThe time width of the start of each pulse;

In addition, when =…==…=And then, the radar waveform of a Pulse Doppler (PD) system is represented; when (when)When stepping at a certain interval, the radar waveform of the stepping frequency system can be represented; when (when)When the frequency agility is random, the radar waveform of the frequency agility system can be represented; when (when)=…==…=When the pulse is in the same period, the pulse has a constant repetition period; when (when)When the random variation occurs, the condition of the repeated frequency jitter is represented;

step2, establishing a waveform description word in the pulse:

in actual implementation, embodiments of the present application may define an arbitrary baseband waveform in the manner of a "chipped waveform descriptor". Specifically, embodiments of the present application may define the pulse width of each pulse in the current CPI as 、…、、…、And for the firstBy pulses at time intervalsPulse width is setDivided intoA number of chips, as shown in fig. 2, wherein,Representing chip time width.

It should be noted that each of the chips has an independent chip description parameter, e.g. for the first chipEach chip includes a start frequencyTermination frequencyAmplitude ofPhase ofFour waveform description parameters, and the modulation pattern of the waveform in the chip can be set to be the initial frequencyModulation bandwidth ofIs a linear frequency modulation of (2);

and step 3, generating a waveform through the waveform description word.

Therefore, the embodiment of the application can flexibly describe various waveforms such as a linear frequency modulation waveform, a phase coding waveform, a frequency coding waveform and the like by setting different chip description parameters, so that various waveforms are parameterized and described by taking a code element as a unit, and corresponding baseband waveforms are generated by using description information of different chips, thereby realizing generalized description of radar waveforms.

In step S102, based on the generalized waveform description mechanism, an inter-pulse waveform description word and an intra-pulse waveform description word of each pulse signal in the current coherent processing interval of the target radar are acquired, so as to generate a baseband waveform sequence of the current coherent processing interval according to the inter-pulse waveform description word and the intra-pulse waveform description word.

In the embodiment of the application, the inter-pulse waveform description word and the intra-pulse waveform description word of each pulse signal in the current coherent processing interval of the target radar can be obtained according to the generalized waveform description mechanism, the baseband waveform sequence of the current coherent processing interval is generated according to the inter-pulse waveform description word and the intra-pulse waveform description word, and meanwhile, the time sequence control information for the whole flow of waveform generation is obtained by obtaining the time sequence related information of pulse repetition period, chip width and the like in the description word.

Optionally, in one embodiment of the present application, based on a generalized waveform description mechanism, acquiring an inter-pulse waveform descriptor and an intra-pulse waveform descriptor of each pulse signal in a current coherent processing interval of a target radar, so as to generate a baseband waveform sequence of the current coherent processing interval according to the inter-pulse waveform descriptor and the intra-pulse waveform descriptor, including: traversing each pulse signal in the current coherent processing interval, and reading carrier frequency information and pulse repetition period information of each pulse signal according to the inter-pulse waveform description word of each pulse signal; acquiring the starting frequency, the ending frequency, the amplitude and the phase of each chip corresponding to each pulse signal based on the intra-pulse waveform description word of each pulse signal; generating an input sequence of a preset Cordic operator according to the initial frequency, the termination frequency, the amplitude and the phase, and calculating a sampling sequence of each chip through the preset Cordic operator; and generating a baseband waveform of each chip based on the carrier frequency information, the pulse repetition period information and the sampling sequence, and constructing a baseband waveform sequence of the current coherent processing interval according to the baseband waveform of each chip.

Specifically, fig. 3 is a schematic flow chart of digital waveform (i.e., baseband waveform sequence) generation. As shown in fig. 3, the process of generating a digital waveform according to the embodiment of the present application is as follows:

1. Receiving a waveform description word of the current CPI, wherein the waveform description word comprises an inter-pulse waveform description word and an intra-pulse waveform description word, and respectively placing the inter-pulse waveform description word and the intra-pulse waveform description word into a corresponding radar storage unit;

2. Embodiments of the present application need to traverse the current CPI when performing radar waveform generation operations Pulse number, and to the firstFor each pulse, embodiments of the present application require reading the first pulse in the inter-pulse waveform descriptorCarrier frequency of individual pulsesAnd PRI length；

3. Traversal No.Of pulsesAnd a number of chips. In the first placeWithin the pulse numberBy way of example, the present application may be implemented from the start frequency in the waveform descriptor in the pulseTermination frequencyAmplitude ofPhase ofOne value for each of the two is read out as shown in fig. 2;

In the actual execution process, the embodiment of the application judges whether the waveform sampling point of the current chip is output or not according to the read amplitude value, such as 0 or 1, and if the read amplitude value is 0, the waveform sampling point can be output after the corresponding point is uniformly set to 0; if the read value is 1, the output can be performed according to the actual amplitude;

second, embodiments of the present application may utilize Cordic operator calculations Equal trigonometric function and set the precision toTo calculate and generate a baseband waveform within the current chip; thereafter, at the firstAfter the baseband waveform of each chip is output, the method is switched to the firstChips, and to the firstPerforming baseband waveform generation operation on each chip;

4. judging the current chip sequence number Whether or not the number of chips is equal to the current pulseIf equal, then represent the currentAfter the generation of the baseband waveforms in the pulses is completed, if the baseband waveforms are not equal, the baseband waveforms are continuously generated on the remaining chips of the current pulse according to the following formula:

wherein, Represent the firstChip time width of each pulse signal; Represent the first The starting frequency of the individual chips; Represent the first The amplitude of the individual chips; Represent the first The phase of the individual chips; Representing a rectangular window function; Represent the first The number of chips in the pulse signal; k represents the current chip sequence number; n is the serial number of the current pulse signal; Representing a continuous domain time; representing the pulse repetition period of the ith pulse signal when When in use, then; When (when)When in use, thenIs the firstPulse start to the firstThe time width from which the pulses are initiated.

5. Judging the sequence number of the current pulseWhether or not to be equal to the total number of pulses in the current CPIIf equal, the baseband waveform representing the current CPI is generated, otherwise, at the current positionAfter the baseband waveform of each pulse is output, the switching is carried out to the firstPulse, perform the firstAnd generating the baseband waveform corresponding to each pulse.

Therefore, the embodiment of the application can construct a baseband waveform sequence of the current coherent processing interval according to the baseband waveform of each pulse in the current CPI, and acquire time sequence control information through the information related to time sequence, such as pulse repetition period, chip width and the like in the corresponding waveform description word.

It can be understood that the embodiment of the application can be compatible with simple conventional modulation waveforms such as single carrier frequency modulation, linear frequency modulation and the like, and can generate baseband waveform sequences and time sequence control information of the current CPI by a parameterized waveform description method, namely, baseband complex modulation waveforms such as nonlinear frequency modulation (approximate description), phase coding, frequency coding, amplitude coding, compound coding and the like, and inter-pulse complex modulation waveforms such as inter-pulse frequency agility and inter-pulse repetition frequency dithering and the like, thereby effectively improving the compatibility of waveform types and the generation efficiency of subsequent radar transmission waveforms.

In step S103, an analog domain baseband signal corresponding to the baseband waveform sequence is obtained through the baseband waveform sequence and the baseband modulation strategy, and a target transmitting signal of the target radar is generated based on the inter-pulse waveform description word and the analog domain baseband signal and by combining the signal processing and the filtering strategy.

After the baseband waveform sequence is generated, further, the embodiment of the application can also perform digital-to-analog conversion on the baseband waveform sequence to generate an analog domain baseband signal, and simultaneously perform local oscillation processing by using the established inter-pulse waveform description word and the time sequence control information to obtain a radio frequency signal corresponding to the current CPI.

Optionally, in one embodiment of the present application, the generating, by using the baseband waveform sequence and the baseband modulation strategy, the analog domain baseband signal corresponding to the baseband waveform sequence, and based on the inter-pulse waveform description word and the analog domain baseband signal, and simultaneously combining the signal processing and the filtering strategy, the target transmitting signal of the target radar includes: based on a baseband modulation strategy, performing digital-to-analog conversion on the baseband waveform sequence to obtain an analog domain baseband signal; executing a preset signal local oscillation operation by using preset time sequence control information and an inter-pulse waveform description word to generate a radio frequency signal, and carrying out frequency mixing processing on the radio frequency signal and an analog domain baseband signal to generate a carrier frequency modulation signal; and performing band-pass filtering operation on the carrier frequency modulation signal to obtain a target output frequency in the carrier frequency modulation signal, and generating a target transmitting signal according to the target output frequency.

It should be noted that, in the embodiment of the present application, digital-to-analog conversion processing may be performed on the baseband waveform sequence, so as to convert the baseband waveform sequence from the digital domain to the analog domain, so as to obtain an analog domain baseband signal; meanwhile, the embodiment of the application can also perform signal local oscillation processing through the time sequence control information and the inter-pulse waveform description words so as to generate radio frequency signals under the control of the time sequence information, thereby providing reliable data basis for further carrier frequency modulation.

wherein, Represent the firstAnalog domain baseband signals of the individual pulse signals; Represent the first Chip time width of each pulse signal; Represent the first The starting frequency of the individual chips; Represent the first The amplitude of the individual chips; Represent the first Termination frequency of the individual chips; Represent the first The phase of the individual chips; Representing a rectangular window function; Represent the first The number of chips in the pulse signal; k represents the current chip sequence number; n is the serial number of the current pulse signal; representing the continuous domain time.

It will be appreciated by those skilled in the art that using the above-established intra-pulse waveform descriptor, embodiments of the present application may obtain intra-pulse waveform description information of the current pulse, i.e., the current pulseInitial frequency of each chipTermination frequencyAmplitude ofPhase of; Thus, for the firstWith respect to each pulse, in combination with the above-described inter-pulse waveform description information, the embodiment of the present application can obtain the firstThe mathematical expression of the analog domain baseband signal corresponding to each pulse is as follows:

wherein, Represent the firstAnalog domain baseband signals of individual pulses; Represent the first Start to the first pulse signalThe time width of the start of each pulse signal; Represent the first A chip start frequency; Represent the first The amplitude of the individual chips, typically 0 or 1,Represent the firstA chip termination frequency; Represent the first A chip phase, typically 0,、、；Represent the firstThe number of pulse chips; k represents the current chip sequence number; n is the serial number of the current pulse signal; Representing a continuous domain time; frequency modulation information representing a current chip; a rectangular window function is represented, which is defined as follows:

In the embodiment of the application, the analog domain baseband signal expression can be well compatible with generating any form of radar waveform. For conventional waveforms, taking a chirped waveform as an example, embodiments of the present application may pass through each chip 、Completing the frequency modulation slopeIs set up by the above-mentioned equipment; for complex waveforms, using frequency coding as an example, embodiments of the present application may enable、The mathematical expression of its corresponding analog domain baseband signal is as follows:

thus, embodiments of the present application are provided by The frequency modulation of the code chip can be realized, and different frequency values are set for different code chips, so that the frequency coding function can be realized.

Further, for the approximate description method of the nonlinear frequency modulation waveform and the random modulation waveform, in the waveform description process, the embodiment of the application can enableRepresent the firstThe phase of the individual pulse baseband signals,Representing the frequency modulation function of the baseband signal,Representing the initial phaseThe mathematical expression of (2) is as follows:

further, the following formula can be obtained:

wherein, Represent the firstPhase change rate of the individual pulse baseband signals.

Fig. 4 (a) is a schematic diagram for describing non-chirped waveform approximation. As shown in FIG. 4 (a), when the non-chirped waveform is approximately described, then in an embodiment of the present applicationHaving nonlinear properties, embodiments of the present application can approximate a nonlinear frequency modulated waveform by:

1. For time of day Dividing to obtainWith the same time interval, i.e. dividingEach time interval is called the chip time width for the firstEach chip, determining its time start and end as respectively、At the same time according to frequency modulation functionDetermining the frequency start and the frequency end as respectively、；

2. The frequency modulation in the chip is approximately linear, i.e. the chipAnd pass throughControlling a frequency modulation slope within the chip;

3. the approximate linear description results of all chips in the pulse are overlapped and arranged to obtain approximate non-linear frequency modulation waveform, and it is noted that proper chip number is required to be set to ensure the best approximate effect To ensure that within a single chipAs close to linear variation as possible.

Specifically, according to the aboveFor the expression of (2)The phase of the baseband signal and the rate of change of waveform phase are as follows:

from this, it can be seen that in the first In each chip, the frequency has the property of linear change, and the embodiment of the application can be realized by setting、Solving forTo control the chirp rate within a chip.

Furthermore, it will be appreciated by those skilled in the art that the approach described for approximation of a non-chirped waveform is equally applicable to any modulated waveform.

Fig. 4 (b) is a schematic diagram for describing arbitrary modulation waveform approximation. As shown in fig. 4 (b), when an arbitrary modulation waveform is approximately described, the phase change rateThe approximate description method of the nonlinear frequency modulation waveform can be compatible with the arbitrary modulation waveform, and the specific approximate description process of the arbitrary modulation waveform is as follows:

1. Dividing a baseband signal of an arbitrary modulated waveform into Each chip and determining the time start and stop of each chip respectively、At the same time according to frequency modulation functionDetermining its frequency start and frequency end as respectively、；

2. Modulating the frequency in each chip by a chirp method, the chirp rate being determined by the frequency in the chipDetermining;

3. and linearly superposing the waveform generation results of all the chips in the time domain to obtain the approximate description of the random modulation waveform.

Therefore, the embodiment of the application determines a generalized waveform generation strategy through the waveform description words in pulses and between pulses by utilizing the analog domain baseband signal expression, and simultaneously can simply adjust the related description word information of the mathematical expression of the analog domain baseband signal according to actual conditions so as to meet the generation requirements of different waveforms.

Further, in the actual implementation process, the embodiment of the application also needs to complete the carrier frequency modulation of the analog domain baseband signal based on the radio frequency signal through up-conversion operation so as to realize the frequency conversion of the analog domain baseband signal and obtain a carrier frequency modulation signal; then, the embodiment of the application can carry out band-pass filtering on a series of frequency components (namely carrier frequency modulation signals) after mixing so as to select and output corresponding target output frequency, and obtain the transmitting signal of the radar according to the target output frequency, thereby effectively inhibiting irrelevant frequency components, improving signal quality, better meeting application requirements and greatly improving the performance and reliability of the circuit.

Optionally, in one embodiment of the present application, the mathematical expression of the target transmit signal is:

wherein, Representing a target transmit signal; representing a rectangular window function; i and n each represent a pulse signal sequence number; representing the pulse width of the nth pulse signal; Representing an analog domain baseband signal; a pulse repetition period representing the i-th pulse signal; Carrier frequency information representing each pulse signal, Representing the continuous domain time.

It should be noted that, in the embodiment of the present application, it may be assumed that the carrier frequency and the pulse repetition period allow hopping within a coherent processing interval, then for the firstFor each pulse, the embodiment of the application can combine the pulse waveform description words to obtain a transmission signal after performing mixing and filtering operations on the analog domain baseband signal, and the mathematical expression of the transmission signal can be expressed as:

wherein, Representing a target transmit signal; i and n each represent a pulse signal sequence number; representing the pulse width of the nth pulse signal; is a baseband modulated waveform (i.e., analog domain baseband signal); a pulse repetition period representing the i-th pulse signal; carrier frequency information representing each pulse signal; A rectangular window function is represented and, Representing the continuous domain time.

Therefore, the embodiment of the application obtains the transmitting signal of the radar through the analog domain baseband signal and the corresponding frequency mixing and filtering strategy, thereby effectively improving the quality and reliability of the transmitting signal of the radar.

The following describes and describes a logic architecture of the radar waveform generation method based on generalized waveform description and a radar waveform decision system carrying the radar waveform generation method based on generalized waveform description according to the present application by referring to the accompanying drawings.

1. Logic architecture of radar waveform generation method based on generalized waveform description

Fig. 5 is a schematic diagram of a logic architecture of a radar waveform generation method based on generalized waveform description. As shown in fig. 5, the logic architecture of the present application mainly includes a waveform description and sequence generation module, a baseband modulation module, a timing control module, a local oscillation module, a mixing module, and a filtering module.

The waveform description and sequence generation module is used for generating a baseband waveform sequence through the inter-pulse waveform description words and the intra-pulse waveform description words so as to provide a basis for subsequent signal modulation;

The baseband modulation module is used for performing digital-to-analog conversion on the baseband waveform sequence to obtain an analog domain baseband signal corresponding to the baseband waveform sequence;

The timing control module is used for generating timing control information of each part in the radar system so as to control the repeated frequency jitter and inter-pulse frequency agility functions of the transmitted signals;

The local oscillation module is used for generating a radio frequency signal and providing carrier frequency modulation information (namely a radio frequency signal) for the baseband signal;

The frequency mixing module is used for carrying out carrier frequency modulation on the radar transmitting signal according to the analog domain baseband signal and the carrier frequency modulation information to obtain a carrier frequency modulation signal (i.e. the modulation signal shown in fig. 5);

And the filtering module is used for suppressing irrelevant frequency components in the carrier frequency modulation signal to output a radar waveform signal (namely a target transmission waveform) at a desired transmission frequency (namely a target output frequency).

In the actual execution process, the waveform description and sequence generation module inputs the inter-pulse waveform description word and the intra-pulse waveform description word of the current CPI, outputs the inter-pulse waveform description word to the local oscillation module as a baseband waveform sequence, and simultaneously outputs the inter-pulse waveform description word to schedule inter-pulse modulation information by settingRandom variation to realize repeated frequency jitter by settingRandom variation realizes frequency agility between pulses;

The input of the baseband modulation module is a baseband waveform sequence of a digital domain and clock information provided by the timing control module so as to output an analog domain baseband signal corresponding to the baseband waveform sequence;

The input of the timing control module is an inter-pulse waveform description word and an intra-pulse waveform description word so as to acquire information related to time sequence, such as pulse repetition period, chip width and the like, in the waveform description word and output time sequence control information;

the local oscillation module inputs time sequence control information and waveform description words among pulses and outputs radio frequency signals containing rectangular window functions and radio frequency components Which is compatible with the repetition frequency dithering function and the inter-pulse frequency agility function, the radio frequency signalThe expression of (2) is as follows:

the input of the frequency mixing module is analog domain baseband signal And radio frequency signalsTo output carrier frequency modulated signals;

The input of the filtering module is the carrier frequency modulation signal, but because the filtering module contains a plurality of irrelevant frequency components, the filtering module needs to carry out filtering operation to output a radar transmitting signal after the frequency components are suppressed.

2. Radar waveform decision system

Fig. 6 is a schematic diagram of a radar waveform decision system. As shown in fig. 6, in the present application, a radar waveform decision system carrying a radar waveform generation method based on generalized waveform description mainly includes a waveform generation module, a transceiver system module, a software signal processing system, and a result evaluation and waveform decision module.

The input of the waveform generation module is used for generating waveform description words required by the transmitted waveform for the current CPI, if the current CPI is the first CPI, a group of waveform description words are initialized, otherwise, the waveform decision result of the last CPI provides the description words. The waveform descriptor information comprises inter-pulse waveform descriptor information such as pulse carrier frequency, pulse repetition period and the like and intra-pulse waveform descriptor information such as starting frequency, ending frequency, amplitude, phase and the like of each chip;

the input of the transceiver system module is a transmitting signal and a waveform description word of the current CPI, the system demodulates a radar echo to a baseband and outputs the radar echo as an echo signal, and simultaneously, the input waveform description word is continuously transmitted;

the inputs to the software signal processing system are the baseband echo signal and the waveform description word. The software signal processing system comprises a baseband waveform generation module and a signal processing module.

Specifically, the application can input the waveform description word into the baseband waveform generation module, generate a digital baseband waveform sequence (namely the baseband waveform sequence) and transmit the digital baseband waveform sequence to the signal processing module to provide a pulse compression window function for subsequent signal processing; in addition, the input of the signal processing module is a baseband echo signal and a digital baseband waveform sequence, and processing operations such as matched filtering, target detection and the like are mainly completed so as to output target detection information (such as target number, distance, speed and other target trace information) and waveform description words of the current CPI;

The input of the result evaluation and waveform decision module is target detection information and waveform description words, and accordingly the target detection and anti-interference effect of the current CPI is evaluated and waveform decision is made, and waveform description word information of the next frame radar emission waveform is output.

According to the radar waveform generation method based on generalized waveform description, which is provided by the embodiment of the application, an inter-pulse waveform description word and an intra-pulse waveform description word of any emitted waveform of a target radar are established, and a generalized waveform description mechanism of the target radar is established according to the inter-pulse waveform description word and the intra-pulse waveform description word; based on a generalized waveform description mechanism, acquiring an inter-pulse waveform description word and an intra-pulse waveform description word of each pulse signal in a current coherent processing interval of a target radar, so as to generate a baseband waveform sequence of the current coherent processing interval according to the inter-pulse waveform description word and the intra-pulse waveform description word; and obtaining an analog domain baseband signal corresponding to the baseband waveform sequence through the baseband waveform sequence and the baseband modulation strategy, and generating a target transmitting signal of the target radar based on the inter-pulse waveform description word and the analog domain baseband signal and simultaneously combining the signal processing and filtering strategy. The application greatly improves the compatibility of waveform types and effectively improves the generation efficiency of waveforms by making the conventional waveforms, the baseband complex waveforms and the inter-pulse complex modulation compatible to the same description method.

Next, a radar waveform generating apparatus based on generalized waveform description according to an embodiment of the present application will be described with reference to the accompanying drawings.

Fig. 7 is a block diagram of a radar waveform generating apparatus based on generalized waveform description according to an embodiment of the present application.

As shown in fig. 7, the radar waveform generating apparatus 10 based on the generalized waveform description includes: waveform description module 100, signal modulation module 200, and waveform generation module 300.

The waveform description module 100 is configured to establish an inter-pulse waveform description word and an intra-pulse waveform description word of an arbitrary transmission waveform of the target radar, and construct a generalized waveform description mechanism of the target radar according to the inter-pulse waveform description word and the intra-pulse waveform description word.

The signal modulation module 200 is configured to obtain, based on a generalized waveform description mechanism, an inter-pulse waveform descriptor and an intra-pulse waveform descriptor of each pulse signal in a current coherent processing interval of the target radar, so as to generate a baseband waveform sequence of the current coherent processing interval according to the inter-pulse waveform descriptor and the intra-pulse waveform descriptor.

The waveform generation module 300 is configured to obtain an analog domain baseband signal corresponding to the baseband waveform sequence through the baseband waveform sequence and the baseband modulation strategy, and generate a target transmitting signal of the target radar based on the inter-pulse waveform description word and the analog domain baseband signal and by combining the signal processing and the filtering strategy.

Optionally, in one embodiment of the present application, the waveform description module 100 includes: the device comprises a first acquisition unit, a first establishment unit and a second establishment unit.

The first acquisition unit is used for calculating the total number of pulse signals in a preset coherent processing interval of the target radar and acquiring intra-pulse chip coding information of each pulse signal in the preset coherent processing interval.

The first establishing unit is used for determining the radar waveform type of each pulse signal in the preset coherent processing interval according to the total number of the pulse signals and establishing the inter-pulse waveform description word of each pulse signal in the preset coherent processing interval based on the radar waveform type and the intra-pulse chip coding information.

And the second establishing unit is used for determining a baseband waveform corresponding to the intra-pulse chip coding information based on the intra-pulse chip coding information and establishing an intra-pulse waveform description word of each pulse signal in a preset coherent processing interval according to the intra-pulse chip coding information and the baseband waveform.

Optionally, in one embodiment of the present application, the signal modulation module 200 includes: the device comprises a traversing unit, a second acquisition unit, a calculation unit and a construction unit.

The traversing unit is used for traversing each pulse signal in the current coherent processing interval and reading carrier frequency information and pulse repetition period information of each pulse signal according to the inter-pulse waveform description word of each pulse signal.

And the second acquisition unit is used for acquiring the starting frequency, the ending frequency, the amplitude and the phase of each chip corresponding to each pulse signal based on the intra-pulse waveform description word of each pulse signal.

The computing unit is used for generating an input sequence of a preset Cordic operator according to the initial frequency, the end frequency, the amplitude and the phase, and computing a sampling sequence of each chip through the preset Cordic operator.

The construction unit is used for generating the baseband waveform of each chip based on the carrier frequency information, the pulse repetition period information and the sampling sequence, and constructing the baseband waveform sequence of the current coherent processing interval according to the baseband waveform of each chip.

Optionally, in one embodiment of the present application, the waveform generation module 300 includes: the device comprises a digital-to-analog conversion unit, an execution unit and a frequency selection unit.

The digital-to-analog conversion unit is used for carrying out digital-to-analog conversion on the baseband waveform sequence based on the baseband modulation strategy so as to obtain an analog domain baseband signal.

And the execution unit is used for executing the local oscillation operation of the preset signal by utilizing the preset time sequence control information and the inter-pulse waveform description word to generate a radio frequency signal, and carrying out mixing processing on the radio frequency signal and the analog domain baseband signal to generate a carrier frequency modulation signal.

And the frequency selection unit is used for performing band-pass filtering operation on the carrier frequency modulation signal to acquire a target output frequency in the carrier frequency modulation signal and generating a target transmitting signal according to the target output frequency.

It should be noted that the foregoing explanation of the embodiment of the method for generating a radar waveform based on the generalized waveform description is also applicable to the radar waveform generating device based on the generalized waveform description of this embodiment, and will not be repeated here.

The radar waveform generation device based on generalized waveform description provided by the embodiment of the application comprises a waveform description module, a target radar waveform description module and a target radar waveform generation module, wherein the waveform description module is used for establishing an inter-pulse waveform description word and an intra-pulse waveform description word of a random emission waveform of the target radar, and constructing a generalized waveform description mechanism of the target radar according to the inter-pulse waveform description word and the intra-pulse waveform description word; the signal modulation module is used for acquiring an inter-pulse waveform description word and an intra-pulse waveform description word of each pulse signal in the current coherent processing interval of the target radar based on a generalized waveform description mechanism so as to generate a baseband waveform sequence of the current coherent processing interval according to the inter-pulse waveform description word and the intra-pulse waveform description word; the waveform generation module is used for obtaining an analog domain baseband signal corresponding to the baseband waveform sequence through the baseband waveform sequence and the baseband modulation strategy, generating a target transmitting signal of the target radar based on the inter-pulse waveform description word and the analog domain baseband signal and combining the signal processing and filtering strategy. The application greatly improves the compatibility of waveform types and effectively improves the generation efficiency of waveforms by making the conventional waveforms, the baseband complex waveforms and the inter-pulse complex modulation compatible to the same description method.

Fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present application. The electronic device may include:

a memory 801, a processor 802, and a computer program stored on the memory 801 and executable on the processor 802.

The processor 802 implements the radar waveform generation method based on the generalized waveform description provided in the above-described embodiment when executing a program.

Further, the electronic device further includes:

a communication interface 803 for communication between the memory 801 and the processor 802.

A memory 801 for storing a computer program executable on the processor 802.

The memory 801 may include high-speed RAM memory or may further include non-volatile memory (non-volatile memory), such as at least one magnetic disk memory.

If the memory 801, the processor 802, and the communication interface 803 are implemented independently, the communication interface 803, the memory 801, and the processor 802 may be connected to each other through a bus and perform communication with each other. The bus may be an industry standard architecture (Industry Standard Architecture, abbreviated ISA) bus, an external device interconnect (PERIPHERAL COMPONENT, abbreviated PCI) bus, or an extended industry standard architecture (Extended Industry Standard Architecture, abbreviated EISA) bus, among others. The buses may be divided into address buses, data buses, control buses, etc. For ease of illustration, only one thick line is shown in fig. 8, but not only one bus or one type of bus.

Alternatively, in a specific implementation, if the memory 801, the processor 802, and the communication interface 803 are integrated on a chip, the memory 801, the processor 802, and the communication interface 803 may communicate with each other through internal interfaces.

The processor 802 may be a central processing unit (Central Processing Unit, abbreviated as CPU), or an Application SPECIFIC INTEGRATED Circuit, abbreviated as ASIC, or one or more integrated circuits configured to implement embodiments of the present application.

The embodiment of the application also provides a computer-readable storage medium on which a computer program is stored, which when executed by a processor implements the radar waveform generation method described above based on generalized waveforms.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, "N" means at least two, for example, two, three, etc., unless specifically defined otherwise.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and additional implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order from that shown or discussed, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present application.

Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or N wires, a portable computer cartridge (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.

It is to be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the N steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.

Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.

The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like. While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims

1. The radar waveform generation method based on the generalized waveform description is characterized by comprising the following steps of:

Establishing an inter-pulse waveform description word and an intra-pulse waveform description word which approximately describe any emitted waveform of a target radar, and constructing a generalized waveform description mechanism of the target radar according to the inter-pulse waveform description word and the intra-pulse waveform description word;

based on the generalized waveform description mechanism, acquiring the inter-pulse waveform description word and the intra-pulse waveform description word of each pulse signal in the current coherent processing interval of the target radar, so as to generate a baseband waveform sequence of the current coherent processing interval according to the inter-pulse waveform description word and the intra-pulse waveform description word;

obtaining an analog domain baseband signal corresponding to the baseband waveform sequence through the baseband waveform sequence and a baseband modulation strategy, and generating a target transmitting signal of the target radar based on the inter-pulse waveform description word and the analog domain baseband signal and simultaneously combining a signal processing strategy and a filtering strategy;

the establishing of the inter-pulse waveform descriptor and the intra-pulse waveform descriptor which approximately describe the random emission waveform of the target radar comprises the following steps:

Calculating the total number of pulse signals in a preset coherent processing interval of the target radar, and acquiring the intra-pulse chip coding information of each pulse signal in the preset coherent processing interval;

determining a radar waveform type of each pulse signal in the preset coherent processing interval according to the total number of the pulse signals, and establishing an inter-pulse waveform description word of each pulse signal in the preset coherent processing interval based on the radar waveform type and the intra-pulse chip coding information;

Determining a baseband waveform corresponding to the intra-pulse chip coding information based on the intra-pulse chip coding information, and establishing an intra-pulse waveform description word of each pulse signal in the preset coherent processing interval according to the intra-pulse chip coding information and the baseband waveform;

the obtaining, based on the generalized waveform description mechanism, the inter-pulse waveform description word and the intra-pulse waveform description word of each pulse signal in a current coherent processing interval of the target radar, so as to generate a baseband waveform sequence of the current coherent processing interval according to the inter-pulse waveform description word and the intra-pulse waveform description word, including:

traversing each pulse signal in the current coherent processing interval, and reading carrier frequency information and pulse repetition period information of each pulse signal according to the inter-pulse waveform description word of each pulse signal;

Acquiring the starting frequency, the ending frequency, the amplitude and the phase of each chip corresponding to each pulse signal based on the pulse internal waveform description word of each pulse signal;

Generating an input sequence of a preset Cordic operator according to the initial frequency, the termination frequency, the amplitude and the phase, and calculating a sampling sequence of each chip through the preset Cordic operator;

generating a baseband waveform of each chip based on the carrier frequency information, the pulse repetition period information and the sampling sequence, and constructing a baseband waveform sequence of the current coherent processing interval according to the baseband waveform of each chip;

The obtaining the analog domain baseband signal corresponding to the baseband waveform sequence through the baseband waveform sequence and the baseband modulation strategy, and generating the target transmitting signal of the target radar based on the inter-pulse waveform description word and the analog domain baseband signal and combining signal processing and filtering strategies, comprising:

based on the baseband modulation strategy, performing digital-to-analog conversion on the baseband waveform sequence to obtain the analog domain baseband signal;

Executing a preset signal local oscillation operation by using preset time sequence control information and the inter-pulse waveform description word to generate a radio frequency signal, and carrying out frequency mixing processing on the radio frequency signal and the analog domain baseband signal to generate a carrier frequency modulation signal;

Performing band-pass filtering operation on the carrier frequency modulation signal to obtain a target output frequency in the carrier frequency modulation signal, and generating the target transmitting signal according to the target output frequency;

the mathematical expression of the analog domain baseband signal is:

2. The method for generating a radar waveform based on generalized waveform description according to claim 1, wherein the mathematical expression of the target transmission signal is:

wherein, Representing the target transmit signal; representing a rectangular window function; i and n each represent a pulse signal sequence number; representing the pulse width of the nth pulse signal; Representing the analog domain baseband signal; Represent the first Pulse repetition periods of the pulse signals; Carrier frequency information representing each pulse signal, Representing the continuous domain time.

3. A radar waveform generation apparatus based on generalized waveform description, comprising:

The waveform description module is used for establishing an inter-pulse waveform description word and an intra-pulse waveform description word which approximately describe the random emission waveform of the target radar, and constructing a generalized waveform description mechanism of the target radar according to the inter-pulse waveform description word and the intra-pulse waveform description word;

The signal modulation module is used for acquiring the inter-pulse waveform description word and the intra-pulse waveform description word of each pulse signal in the current coherent processing interval of the target radar based on the generalized waveform description mechanism so as to generate a baseband waveform sequence of the current coherent processing interval according to the inter-pulse waveform description word and the intra-pulse waveform description word;

The waveform generation module is used for obtaining an analog domain baseband signal corresponding to the baseband waveform sequence through the baseband waveform sequence and a baseband modulation strategy, and generating a target transmitting signal of the target radar based on the inter-pulse waveform description word and the analog domain baseband signal and simultaneously combining a signal processing strategy and a filtering strategy;

Wherein the waveform description module comprises:

The first acquisition unit is used for calculating the total number of pulse signals in a preset coherent processing interval of the target radar and acquiring intra-pulse chip coding information of each pulse signal in the preset coherent processing interval;

The first establishing unit is used for determining the radar waveform type of each pulse signal in the preset coherent processing interval according to the total number of the pulse signals and establishing an inter-pulse waveform description word of each pulse signal in the preset coherent processing interval based on the radar waveform type and the intra-pulse chip coding information;

The second establishing unit is used for determining a baseband waveform corresponding to the intra-pulse chip coding information based on the intra-pulse chip coding information and establishing an intra-pulse waveform description word of each pulse signal in the preset coherent processing interval according to the intra-pulse chip coding information and the baseband waveform;

the signal modulation module includes:

The traversing unit is used for traversing each pulse signal in the current coherent processing interval and reading carrier frequency information and pulse repetition period information of each pulse signal according to the inter-pulse waveform description word of each pulse signal;

the second acquisition unit is used for acquiring the starting frequency, the ending frequency, the amplitude and the phase of each chip corresponding to each pulse signal based on the pulse internal waveform description word of each pulse signal;

The computing unit is used for generating an input sequence of a preset Cordic operator according to the initial frequency, the end frequency, the amplitude and the phase, and computing a sampling sequence of each chip through the preset Cordic operator;

A construction unit, configured to generate a baseband waveform of each chip based on the carrier frequency information, the pulse repetition period information, and the sampling sequence, and construct a baseband waveform sequence of the current coherent processing interval according to the baseband waveform of each chip;

The waveform generation module includes:

The digital-to-analog conversion unit is used for carrying out digital-to-analog conversion on the baseband waveform sequence based on the baseband modulation strategy so as to acquire the analog domain baseband signal;

the execution unit is used for executing a preset signal local oscillation operation by utilizing preset time sequence control information and the inter-pulse waveform description word to generate a radio frequency signal, and carrying out frequency mixing processing on the radio frequency signal and the analog domain baseband signal to generate a carrier frequency modulation signal;

A frequency selection unit, configured to perform a band-pass filtering operation on the carrier frequency modulation signal, so as to obtain a target output frequency in the carrier frequency modulation signal, and generate the target transmission signal according to the target output frequency;

the mathematical expression of the analog domain baseband signal is:

4. The generalized waveform description-based radar waveform generation apparatus of claim 3, wherein the mathematical expression of the target transmit signal is:

5. An electronic device, comprising: a memory, a processor and a computer program stored on the memory and executable on the processor, the processor executing the program to implement the generalized waveform description-based radar waveform generation method of any one of claims 1-2.

6. A computer-readable storage medium having stored thereon a computer program, characterized in that the program is executed by a processor for implementing the generalized waveform description-based radar waveform generation method according to any one of claims 1-2.