CN111294116A - Linear frequency modulation signal processing method, device and equipment - Google Patents

Abstract

A chirp signal processing method, device and equipment, comprising: pulse modulating a narrowband chirp signal to be transmitted; the frequency of the modulated pulse is not less than the bandwidth of the narrowband chirp signal; after transmitting the modulated narrowband chirp signal The receiving channel is closed during the pulse; the radio frequency signal storage DRFM is performed on the broadband chirp signal to be transmitted and the segmented playback is performed; the pulse width sum and bandwidth sum of each sub-pulse of the broadband chirp signal are the same as the pulse width and bandwidth of the original signal; Closes the receive channel when transmitting sub-pulses of a segmented wideband chirp. By adopting the solution in the present application, the realization is easy and the isolation effect is good.

Description

A kind of linear frequency modulation signal processing method, device and equipment

technical field

The present application relates to radio frequency simulation technology, and in particular, to a method, apparatus and device for processing a chirp signal.

Background technique

In the microwave anechoic chamber radiation RF simulation system, the distance between the transmitting antenna and the receiving antenna cannot be very large, and the transmitting signal enters the receiving antenna through the antenna sidelobe, and the isolation is poor.

The traditional methods to solve the isolation include adding absorbing materials, radio frequency cancellation and other methods. The absorbing materials have poor isolation effect, and the absorbing materials used in different frequency bands are different. The requirements are extremely high and difficult to achieve.

SUMMARY OF THE INVENTION

Embodiments of the present application provide a chirp signal processing method, apparatus, and device to solve the above-mentioned technical problems.

According to a first aspect of the embodiments of the present application, a method for processing a chirp signal is provided, including the following steps:

Pulse modulation is performed on the narrowband chirp signal to be transmitted; the frequency of the modulated pulse is not less than the bandwidth of the narrowband chirp signal;

The receive channel is closed when the modulated narrowband chirp sub-pulses are transmitted.

According to a second aspect of the embodiments of the present application, a method for processing a chirp signal is provided, including:

performing radio frequency signal storage DRFM on the broadband chirp signal to be transmitted and playing in segments; the pulse width sum and bandwidth sum of each sub-pulse of the broadband chirp signal are the same as the pulse width and bandwidth of the original signal;

Closes the receive channel when transmitting sub-pulses of a segmented wideband chirp.

According to a third aspect of the embodiments of the present application, a linear frequency modulation signal processing apparatus is provided, including:

a modulation module for performing pulse modulation on the narrowband chirp signal to be transmitted; the frequency of the modulated pulse is not less than the bandwidth of the narrowband chirp signal;

The first processing module is used for closing the receiving channel when transmitting the modulated narrowband chirp signal sub-pulse.

According to a fourth aspect of the embodiments of the present application, a linear frequency modulation signal processing apparatus is provided, including:

The storage module is used for performing radio frequency signal storage DRFM on the broadband chirp signal to be transmitted and playing in segments; the pulse width sum and bandwidth sum of each sub-pulse of the broadband chirp signal are the same as the pulse width and bandwidth of the original signal;

The second processing module is used for closing the receiving channel when transmitting the sub-pulses of the broadband chirp signal played in segments.

According to a fifth aspect of the embodiments of the present application, a device for transmitting and receiving a chirp signal is provided, including the above-mentioned chirp signal processing apparatus, a transmitting channel, a receiving channel, a transmitting antenna and a receiving antenna.

Using the chirp signal processing method, device, and device provided in the embodiments of the present application, an extremely narrow pulse is used for the narrowband chirp signal to modulate the transmit signal at a high speed, the modulating pulse frequency is not less than the signal bandwidth, and the receiving channel is closed when the sub-pulse is transmitted ; Use DRFM (Radio Frequency Signal Storage) for segmented playback of broadband linear frequency modulation signals, and close the receiving channel when sub-pulses are transmitted, which is easy to implement and has a good isolation effect.

Description of drawings

The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The schematic embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation of the present application. In the attached image:

FIG. 1 shows a schematic flowchart of the implementation of the chirp signal processing method in Embodiment 1 of the present application;

FIG. 2 shows a schematic diagram of sending and receiving a narrowband chirp signal in Embodiment 1 of the present application;

FIG. 3 shows a schematic diagram of modulation of a narrowband chirp signal in Embodiment 1 of the present application;

FIG. 4 shows a schematic flowchart of the implementation of the chirp signal processing method in Embodiment 2 of the present application;

FIG. 5 shows a schematic diagram of sending and receiving a broadband chirp signal in Embodiment 2 of the present application;

FIG. 6 shows a schematic diagram of the modulation of the broadband chirp signal in the second embodiment of the present application;

FIG. 7 shows a schematic structural diagram of a linear frequency modulation signal processing apparatus in Embodiment 3 of the present application;

FIG. 8 shows a schematic structural diagram of a linear frequency modulation signal processing apparatus in Embodiment 4 of the present application;

FIG. 9 shows a schematic structural diagram of a device for transmitting and receiving a chirp signal in Embodiment 5 of the present application.

Detailed ways

The solutions in the embodiments of the present application may be implemented in various computer languages, for example, the object-oriented programming language Java and the literal translation scripting language JavaScript, and the like.

In order to make the technical solutions and advantages of the embodiments of the present application more clear, the exemplary embodiments of the present application will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, and Not all embodiments are exhaustive. It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict.

In view of the technical problems in the prior art, the embodiments of the present application provide a method for generating and processing chirp signals compatible with wide and narrowband signals suitable for radio frequency radiation simulation experiments in microwave anechoic chambers, which is easy to implement and has a good isolation effect.

Wideband and narrowband chirps have different uses in radar, and the processing methods to improve isolation are also different, which are explained below.

Example 1

The embodiment of the present application is a processing method for improving isolation proposed for a narrowband chirp signal.

During the process of the invention, the inventors noticed:

The narrow-band chirp signal is used for the radar to search and track the target. The chirp signal is used to improve the time-width-bandwidth product of the signal and improve the resolution without reducing the search and tracking distance. In the microwave anechoic chamber radiation test, the distance is limited, and the modulation isolation method can achieve the equivalent tracking and searching effect of the target.

FIG. 1 shows a schematic flowchart of the implementation of the chirp signal processing method in Embodiment 1 of the present application.

As shown in the figure, the chirp signal processing method includes:

Step 101: Pulse modulation is performed on the narrowband chirp signal to be transmitted; the frequency of the modulated pulse is not less than the bandwidth of the narrowband chirp signal;

Step 102: Close the receiving channel when transmitting the modulated narrowband chirp signal sub-pulses.

FIG. 2 shows a schematic diagram of sending and receiving a narrowband chirp signal in Embodiment 1 of the present application.

As shown in the figure, in the prior art, as shown on the left of the figure, the transmit channel transmits the narrowband chirp signal through the transmit antenna, the receive channel receives the narrowband chirp signal through the receive antenna, and the direct signal can be transmitted between the transmit antenna and the receive antenna. In this embodiment of the present application, as shown in the right figure, a modulation process is added.

FIG. 3 shows a schematic diagram of modulation of a narrowband chirp signal in Embodiment 1 of the present application.

As shown in the figure, in the embodiment of the present application, the original transmit signal is modulated by a certain modulation frequency into a modulated transmit signal, and the received narrowband chirp signal is also a modulated receive signal. The modulated transmit and receive signals (including the overall bandwidth of the sub-pulses and gaps) are the same as the bandwidth of the original transmit signal.

The modulation frequency is not less than the signal bandwidth to ensure that the modulated signal does not alias in the frequency domain, and high-speed modulation is difficult to achieve for a signal with a larger bandwidth. Signal.

By adopting the chirp signal processing method provided in the embodiment of the present application, an extremely narrow pulse is used for the narrowband chirp signal to modulate the transmit signal at a high speed, the frequency of the modulated pulse is not less than the signal bandwidth, and the receiving channel is closed when the sub-pulse is transmitted, which is easy to realize, The isolation effect is good.

In one embodiment, the method further comprises:

The echo signals are received in the gaps between the transmission of a plurality of narrowband chirp sub-pulses.

During specific implementation, the sub-pulse width and sub-pulse gap should be designed to cover the target, and the echo signal and the direct signal do not overlap.

In the embodiment of the present application, the modulation isolation uses extremely narrow pulses to modulate the transmission signal at high speed, the modulation pulse frequency is not less than the signal bandwidth, the receiving channel is closed when the sub-pulses are transmitted, and the echo signal is received in the gap between the transmission sub-pulses.

In one embodiment, the method further comprises:

The received signal is filtered to restore the original signal before modulation.

In the specific implementation, the received signal is filtered by a filter, which can be restored to the original signal that should be received, and pulse compression can be performed according to normal signal processing.

Embodiment 2

The embodiment of the present application is a processing method for improving isolation proposed for a broadband chirp signal.

During the process of the invention, the inventors noticed:

The wideband chirp signal is used for the radar to image the target. The large bandwidth ensures the range resolution of the imaging. The azimuth resolution imaging is realized through the azimuth accumulation. The length of the accumulation time is not high, as long as the accumulation angle is sufficient, so the pulse splicing method is used to achieve Transceiver isolation allows the modulated pulse train to be longer than the original pulse.

FIG. 4 shows a schematic flowchart of the implementation of the chirp signal processing method in Embodiment 2 of the present application.

As shown in the figure, the chirp signal processing method includes:

Step 401, performing radio frequency signal storage DRFM on the broadband chirp signal to be transmitted and playing in segments; the sum of the pulse widths and the sum of the bandwidths of each sub-pulse of the broadband chirp signal is the same as the pulse width and the bandwidth of the original signal;

Step 402: Close the receiving channel when transmitting sub-pulses of the broadband chirp signal played in segments.

During specific implementation, the embodiment of the present application uses DRFM (Radio Frequency Signal Storage, digitai radio frequency memory) to perform segmented playback of the transmitted broadband chirp signal, and the sum of the pulse width and bandwidth of each sub-pulse is equal to the pulse width and bandwidth of the original transmitted signal. . The receive channel is closed when the sub-pulse is emitted to improve isolation.

FIG. 5 shows a schematic diagram of sending and receiving a broadband chirp signal in Embodiment 2 of the present application.

As shown in the figure, in the prior art, as shown on the left of the figure, the transmit channel transmits the broadband chirp signal through the transmit antenna, the receive channel receives the broadband chirp signal through the receive antenna, and a direct signal can be transmitted between the transmit antenna and the receive antenna. In the embodiment of the present application, as shown in the right figure, a DRFM component is added to each of the transmit channel and the receive channel.

FIG. 6 shows a schematic diagram of modulation of a broadband chirp signal in Embodiment 2 of the present application.

As shown in the figure, in the embodiment of the present application, the original transmit signal is modulated by a certain modulation frequency into a modulated transmit signal, and the received signal is also a modulated receive signal. The sum of pulse width and bandwidth of each sub-pulse of the modulated signal (excluding the gap) is equal to the pulse width and bandwidth of the original transmitted signal.

Using the chirp signal processing method provided in the embodiment of the present application, the broadband chirp signal is played in segments using DRFM (Radio Frequency Signal Storage), and the receiving channel is closed when the sub-pulse is transmitted, which is easy to implement and has a good isolation effect.

In one embodiment, the method further comprises:

Perform RF signal storage DRFM on the received broadband chirp signal and delay playback.

During specific implementation, the embodiment of the present application also uses DRFM to store and delay playback of the received signal.

In one embodiment, the method further comprises:

After all the sub-pulses are received, the pulse gap is eliminated, and the sub-pulses are spliced into a complete pulse. The width and bandwidth of the spliced pulse are the same as those of the original signal.

In specific implementation, the embodiment of the present application removes the pulse gap after receiving all the sub-pulses, and splices the sub-pulses into a complete pulse, and the pulse width and signal bandwidth are the same as the original signal, so that the transmitted and received signals after modulation and the signal before modulation are realized. equivalent.

In one embodiment, the DRFM adopts a first-in-first-out FIFO structure when receiving a signal, only the part with a signal is received, and no signal is received in the sub-pulse gap; after the received signal exceeds half of the number of sub-pulses, it is received while playing.

In the embodiment of the present application, the receiving channel is closed when the sub-pulse is transmitted to improve the isolation, and the DRFM component adopts the FIFO structure when receiving, and only the part with the signal is received, and no signal is received in the sub-pulse gap. Playing while receiving, the signal after sub-pulse synthesis is only slightly delayed from the signal that should have been received, and the bandwidth and pulse width are the same.

The sub-pulse width and sub-pulse gap should be designed to cover the target, and the echo signal and the direct signal do not overlap. The spliced signal is processed by the original broadband pulse compression algorithm.

Embodiment 3

Based on the same inventive concept, an embodiment of the present application provides a chirp signal processing device, the principle of which solves the technical problem is similar to the chirp signal processing method in the first embodiment, and the repetition will not be repeated.

FIG. 7 shows a schematic structural diagram of a linear frequency modulation signal processing apparatus in Embodiment 3 of the present application.

As shown in the figure, the chirp signal processing device includes:

A modulation module 701, configured to perform pulse modulation on the narrowband chirp signal to be transmitted; the frequency of the modulated pulse is not less than the bandwidth of the narrowband chirp signal;

The first processing module 702 is configured to close the receiving channel when transmitting the modulated narrow-band chirp signal sub-pulses.

Using the chirp signal processing device provided in the embodiment of the present application, the narrowband chirp signal is modulated at high speed with extremely narrow pulses, the frequency of the modulated pulse is not less than the signal bandwidth, and the receiving channel is closed when the sub-pulse is transmitted, which is easy to realize, The isolation effect is good.

In one embodiment, it further includes:

The receiving module is used for receiving echo signals in the gaps between transmitting a plurality of narrowband chirp signal sub-pulses.

In one embodiment, it further includes:

The filtering module is used for filtering the received signal and recovering the original signal before modulation.

Embodiment 4

Based on the same inventive concept, an embodiment of the present application provides a chirp signal processing device, the principle of which solves the technical problem is similar to the chirp signal processing method in the second embodiment, and the repetition will not be repeated.

FIG. 8 shows a schematic structural diagram of a linear frequency modulation signal processing apparatus in Embodiment 4 of the present application.

As shown in the figure, the chirp signal processing device includes:

The storage module 801 is used for performing radio frequency signal storage DRFM on the broadband chirp signal to be transmitted and playing in segments; the sum of the pulse width and the bandwidth of each sub-pulse of the broadband chirp signal is the same as the pulse width and the bandwidth of the original signal;

The second processing module 802 is configured to close the receiving channel when transmitting the sub-pulses of the broadband chirp signal played in segments.

Using the chirp signal processing device provided in the embodiment of the present application, DRFM (Radio Frequency Signal Storage) is used for segmented playback of the broadband chirp signal, and the receiving channel is closed when the sub-pulse is transmitted, which is easy to implement and has a good isolation effect.

In one embodiment, it further includes:

The first receiving and processing module is used to perform radio frequency signal storage DRFM on the received broadband chirp signal and delay playback.

In one embodiment, it further includes:

The second receiving and processing module is used for removing the pulse gap after receiving all the sub-pulses, splicing the sub-pulses into a complete pulse, and the width and bandwidth of the spliced pulse are the same as those of the original signal.

In one embodiment, it further includes:

When receiving signals, DRFM adopts a first-in-first-out FIFO structure, only the part with signals is received, and no signal is received in the sub-pulse gap; after the received signal exceeds half of the number of sub-pulses, it is received while playing.

Embodiment 5

Based on the same inventive concept, an embodiment of the present application further provides a device for transmitting and receiving a chirp signal, which will be described below.

FIG. 9 shows a schematic structural diagram of a device for transmitting and receiving a chirp signal in Embodiment 5 of the present application.

As shown in the figure, the chirp signal transceiving device includes: the chirp signal processing apparatus according to the third embodiment and/or the chirp signal processing apparatus according to the fourth embodiment, and a transmitting channel and a receiving channel , transmit antenna and receive antenna.

Using the chirp signal transceiver device provided in the embodiment of the present application, a very narrow pulse is used for the narrowband chirp signal to modulate the transmit signal at a high speed, the modulated pulse frequency is not less than the signal bandwidth, and the receiving channel is closed when the sub-pulse is transmitted; The FM signal adopts DRFM (Radio Frequency Signal Storage) for segmented playback, and closes the receiving channel when the sub-pulse is transmitted, which is easy to implement and has a good isolation effect.

As will be appreciated by those skilled in the art, the embodiments of the present application may be provided as a method, a system, or a computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

While the preferred embodiments of the present application have been described, additional changes and modifications to these embodiments may occur to those skilled in the art once the basic inventive concepts are known. Therefore, the appended claims are intended to be construed to include the preferred embodiment and all changes and modifications that fall within the scope of this application.

Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims (10)

1. A linear frequency modulation signal processing method, is characterized in that, comprises: Pulse modulation is performed on the narrowband chirp signal to be transmitted; the frequency of the modulated pulse is not less than the bandwidth of the narrowband chirp signal; The receive channel is closed when the modulated narrowband chirp sub-pulses are transmitted. 2. The method of claim 1, further comprising: The echo signals are received in the gaps between the transmission of a plurality of narrowband chirp sub-pulses. 3. The method of claim 2, further comprising: The received signal is filtered to restore the original signal before modulation. 4. A chirp signal processing method, characterized in that, comprising: performing radio frequency signal storage DRFM on the broadband chirp signal to be transmitted and playing in segments; the pulse width sum and bandwidth sum of each sub-pulse of the broadband chirp signal are the same as the pulse width and bandwidth of the original signal; Closes the receive channel when transmitting sub-pulses of a segmented wideband chirp. 5. The method of claim 3, further comprising: Perform RF signal storage DRFM on the received broadband chirp signal and delay playback. 6. The method of claim 3, further comprising: After all the sub-pulses are received, the pulse gap is eliminated, and the sub-pulses are spliced into a complete pulse. The width and bandwidth of the spliced pulse are the same as those of the original signal. 7. method according to claim 4, is characterized in that, DRFM adopts first-in-first-out FIFO structure when receiving signal, only receives the part with signal, and sub-pulse gap does not receive signal; Signal to be received exceeds half of the number of sub-pulses after the side Play while receiving. 8. A chirp signal processing device, comprising: a modulation module for performing pulse modulation on the narrowband chirp signal to be transmitted; the frequency of the modulated pulse is not less than the bandwidth of the narrowband chirp signal; The first processing module is used for closing the receiving channel when transmitting the modulated narrowband chirp signal sub-pulse. 9. A chirp signal processing device, comprising: The storage module is used for performing radio frequency signal storage DRFM on the broadband chirp signal to be transmitted and playing in segments; the sum of the pulse width and the bandwidth of each sub-pulse of the broadband chirp signal are the same as the pulse width and the bandwidth of the original signal; The second processing module is used for closing the receiving channel when transmitting the sub-pulses of the broadband chirp signal played in segments. 10. A device for transmitting and receiving a chirp signal, characterized in that it comprises the chirp signal processing device according to claim 8 and/or the chirp signal processing device according to claim 9, and a transmitting channel, a receiving channel , transmit antenna and receive antenna.

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