CN115412413A - External radiation source radar clutter suppression method based on 5G OFDM signal - Google Patents
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Abstract
The invention relates to the technical field of radar detection of an external radiation source, in particular to a clutter suppression method of the radar of the external radiation source based on 5GOFDM signals, which comprises the following steps: acquiring a 5G signal direct wave as a reference signal and a target echo as a monitoring signal; converting the reference signal and the monitoring signal from a time domain to a subcarrier domain by utilizing the OFDM characteristics of the 5G signal; multipath clutter of zero Doppler frequency shift is suppressed in a subcarrier domain; expanding the clutter subspace of each carrier into copies of two reference carriers; suppressing multipath clutter with Doppler shift; and performing range-Doppler processing to obtain target information. The method utilizes an ECA-C algorithm to suppress clutter components of zero Doppler frequency shift, and then introduces a method of expanding clutter subspaces of each carrier into copies of two reference carriers in a subcarrier domain to suppress the clutter components with the Doppler frequency shift.
Description
Technical Field
The invention relates to the technical field of radar detection of an external radiation source, in particular to a clutter suppression method of the radar of the external radiation source based on 5GOFDM signals.
Background
Radars are electronic devices that detect objects using electromagnetic waves. The radar emits electromagnetic wave signals to irradiate the target and receives reflected echo signals of the target, and therefore information such as the distance, the azimuth and the height from the target to an electromagnetic wave emission point is obtained. The external radiation radar belongs to one of radar devices, but is different from the traditional radar in that the external radiation radar does not need to emit electromagnetic waves per se, but detects a target by utilizing electromagnetic wave signals emitted by a third-party non-cooperative radio emission device. Third party non-cooperative radio transmission equipment is typically a civilian broadcast, a television transmitter station, a navigation satellite, a communications base station, or the like.
The external radiation source radar is provided with a reference antenna and a monitoring antenna as equipment for receiving signals, and the reference antenna intercepts direct wave signals transmitted by the non-cooperative radiation source and serves as reference signals; the signal emitted by the non-cooperative radiation source irradiates the target, and then the target reflects the echo signal and is intercepted by the monitoring antenna to be the monitoring signal. Due to the complex external environment, the acquired target reflected echo signal often includes a multipath clutter signal reflected by an interfering target, the multipath clutter signal includes echoes of a moving interfering target and a stationary interfering target, and for the moving interfering target, the multipath clutter signal also has a doppler frequency shift caused by the movement of the target. The multipath clutter signals are often stronger than the target echo signals, and may obscure the target echo signals, thereby affecting the detection performance of the target.
The conventional clutter suppression method for the external radiation source radar adopts a time domain clutter suppression Algorithm, which mainly comprises a Least mean Square error (LMS) Algorithm, a Recursive Least Square (RLS) Algorithm and an Extended Cancellation (ECA) Algorithm; although these algorithms can suppress clutter interference, they have problems such as slow convergence rate, high filter order, and large amount of calculation. With the increasing adoption of OFDM modulation of civil communication signals, a multipath clutter suppression method based on a subCarrier domain is concerned by researchers, a subCarrier domain multipath clutter suppression Algorithm mainly comprises a subCarrier domain expansion Cancellation (ECA-C) Algorithm, the ECA-C Algorithm is an application of the ECA Algorithm in the subCarrier domain, and the ECA-C Algorithm utilizes the time correlation among multipath clutter on the same subCarrier to project a monitoring signal to an orthogonal clutter subspace to filter out a clutter component with zero Doppler frequency shift. The clutter suppression method based on the subcarrier domain has the advantages of reducing the operation complexity, but has no advantages of filtering clutter interference with Doppler frequency shift.
Disclosure of Invention
The invention aims to provide an external radiation source radar clutter suppression method based on a 5G OFDM signal, so as to solve the problems in the background technology.
The technical scheme of the invention is as follows: an external radiation source radar clutter suppression method based on 5G OFDM signals comprises the following steps:
s1, obtaining 5G OFDM reference signal S received by 5G OFDM external radiation source radar reference antenna ref (t) and 5G OFDM monitor signal S received by the monitor antenna surv (t)；
S2, obtaining a reference signal S ref (t) and a monitoring signal S surv (t) dividing the OFDM signal into a series of OFDM symbols, and performing Discrete Fourier Transform (DFT) on the useful data part after removing the Cyclic Prefix (CP) to obtain a reference signal S of a subcarrier domain ref (n) and a monitoring signal S surv (n)；
S3, projecting the monitoring signal in the subcarrier domain to an orthogonal clutter subspace, and filtering out multipath clutter components with zero Doppler frequency shift;
s4, expanding the clutter subspace of each carrier in a subcarrier domain, wherein the clutter subspace of each carrier is the subcarriers of two copied reference signals;
s5, projecting the monitoring signal with the multipath clutter of the zero Doppler frequency shift filtered to the expanded orthogonal clutter subspace, and filtering out multipath clutter components with the Doppler frequency shift;
and S6, performing distance-Doppler processing on the monitoring signal and the reference signal after clutter suppression, improving the signal-to-noise ratio of target detection, and realizing target detection.
Preferably, in S4, the k-th subcarrier after spreading constitutes a clutter subspace represented as:
C′ k ＝[Λ H C k C k ΛC k ]；
in the formula, superscript H denotes the conjugate transpose, Λ is the phase shift diagonal matrix, expressed as:
in the formula (f) dm Is the Doppler frequency, T s For the OFDM symbol duration, L is the number of OFDM symbols processed in parallel, thus constructing a new spur subspace denoted as:
in the formula, the superscript H represents the conjugate transpose, and the superscript "-1" represents the inverse matrix.
Preferably, in S5, each subcarrier on the monitoring signal is followed by T' k Orthogonal projection is carried out on the formed clutter subspace, so that the multipath clutter component monitoring signal with the Doppler frequency shift filtered is obtained by:
Y′ k ＝Y k (I-T′ k )；
wherein,
is referred to as monitor Signal perpendicular to T' k Forming an orthogonal projection matrix of the clutter subspace;
wherein I is an identity matrix and Y is k The monitoring signal is used for suppressing multipath clutter with zero Doppler frequency shift.
Preferably, in S6, a reference signal S is used ref (n) and target echo signal Y 'after clutter suppression' k Performing distance-Doppler two-dimensional correlation processing:
in the formula, S ref (n) is a reference signal, and symbol denotes a complex conjugate, Y' k Represents the target echo signal after clutter suppression, N represents the total received data length, N =1,2,3.. N, τ represents time delay, and f represents doppler shift.
Through improvement, the invention provides an external radiation source radar clutter suppression method based on 5G OFDM signals, and compared with the prior art, the method has the following improvements and advantages:
the invention utilizes the CP-OFDM characteristic of 5G signal, considers comprehensively and provides a clutter suppression method of an external radiation source radar based on 5G OFDM signal, the method is different from the conventional sub-carrier domain multipath clutter suppression algorithm treatment, the ECA-C algorithm is utilized to suppress the clutter component of zero Doppler frequency shift, and then the clutter subspace of each carrier is extended into the copy of two reference carriers in the sub-carrier domain to suppress the clutter component with Doppler frequency shift; the method can effectively inhibit multipath clutter interference and has unique advantages compared with the clutter inhibition method of the conventional external radiation source radar.
Drawings
The invention is further explained below with reference to the figures and examples:
FIG. 1 is a block diagram of an implementation of the present invention;
FIG. 2 is a schematic diagram of an external radiation source radar of a 5G OFDM signal according to the present invention;
FIG. 3 is a schematic diagram of an OFDM signal structure according to the present invention;
fig. 4 is a flow chart of time domain to subcarrier domain conversion according to the present invention.
Detailed Description
The present invention is described in detail below, and technical solutions in embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
With the popularization and popularity of the fifth generation mobile communication technology (5G), 5G civil communication signals become the most extensive electromagnetic resources in cities, the 5G signals under complex urban environments have the advantages of a large number of transmitting base stations, dense arrangement of the base stations and the like, the 5G signals have the characteristics of wide bandwidth, cyclic Prefix Orthogonal Frequency Division Multiplexing (CP-OFDM) and the like, and the CP copies a part of the tail of an OFDM symbol to the front so as to eliminate symbol interference and inter-channel interference; OFDM divides a channel into a plurality of orthogonal sub-channels, converts a high-speed data signal into parallel low-speed sub-data streams, and modulates the parallel low-speed sub-data streams onto each sub-channel for transmission, as shown in fig. 3, where CP: cyclic prefix (a part of the tail of the OFDM symbol is copied to the head); symbol x: valid data. Therefore, the 5G signal is used as an external radiation source to acquire information such as target distance, speed, angle and the like, so that the method has advantages; the invention provides an external radiation source radar clutter suppression method based on 5G OFDM signals through improvement, and the technical scheme of the invention is as follows:
as shown in fig. 1, an external radiation source radar clutter suppression method based on 5G OFDM signals includes the following steps:
s1, obtaining a 5G OFDM reference signal S received by a reference antenna of a 5G OFDM external radiation source radar (shown in figure 2) ref (t) and 5G OFDM monitor signal S received by the monitor antenna surv (t)；
S2, as shown in FIG. 4, obtaining the reference signal S ref (t) and a monitoring signal S surv (t) dividing the OFDM signal into a series of OFDM symbols, and performing Discrete Fourier Transform (DFT) on the useful data part after removing the Cyclic Prefix (CP) to obtain a reference signal S of a subcarrier domain ref (n) and a monitoring signal S surv (n)；
In particular, the signal S is monitored surv (n) may be expressed as:
in the formula, Y l,k Representing the first O in the monitoring signalData on the kth subcarrier in the FDM symbol, L represents the total number of OFDM symbols, and K represents the total number of subcarriers in each OFDM symbol;
reference signal S ref The kth carrier over L symbols in (n) is represented as:
C k ＝[C k,1 …C k,l …C k,L ]；
in the formula, C k,l Data of a k-th subcarrier in an l-th symbol;
s3, projecting the monitoring signal in the subcarrier domain to an orthogonal clutter subspace, and filtering out multipath clutter components with zero Doppler frequency shift;
specifically, each subcarrier on the monitoring signal is followed by C k Orthogonal projection is carried out on the formed clutter subspace, and a clutter subspace projection matrix of the kth carrier wave is as follows:
in the formula, I is a unit matrix, superscript H represents a conjugate transpose, and superscript "-1" represents an inverse matrix, so that a monitoring signal of a multipath clutter component for suppressing a zero doppler frequency shift is obtained as follows:
Y k ＝T k Y；
wherein, Y is a monitoring signal in a subcarrier domain;
s4, expanding the clutter subspace of each carrier in the subcarrier domain, wherein the clutter subspace of each carrier is the subcarriers of two copied reference signals, and the expanded kth subcarrier forms a clutter subspace representation:
C′ k ＝[Λ H C k C k ΛC k ]；
in the formula, superscript H denotes the conjugate transpose, Λ is the phase shift diagonal matrix, expressed as:
in the formula (f) dm Is the Doppler frequency, T s Is the OFDM symbol duration, L is the number of OFDM symbols processed in parallel; thus, a new clutter subspace is constructed as:
in the formula, the superscript H represents the conjugate transpose, and the superscript "-1" represents the inverse matrix;
s5, projecting the monitoring signal of the multipath clutter with the filtered zero Doppler frequency shift into an expanded orthogonal clutter subspace, and filtering out multipath clutter components with the Doppler frequency shift;
specifically, each sub-carrier on the monitoring signal is represented by T k Orthogonal projection is carried out on the formed clutter subspace, so that a multipath clutter component monitoring signal with Doppler frequency shift is obtained by filtering:
Y′ k ＝Y k (I-T′ k )；
wherein,
referred to as the monitoring signal being perpendicular to T k ' orthogonal projection matrix of the constructed clutter subspace;
wherein I is a unit matrix, Y k A monitoring signal for suppressing multipath clutter with zero doppler shift;
s6, after clutter suppression, the target echo signal is still weak and the target cannot be directly detected, so that the signal intensity of the target echo is improved and the target information is acquired by adopting distance-Doppler two-dimensional correlation processing, namely, the reference signal S is utilized ref (n) and clutter suppressed target echo signal Y k ' performing range-doppler two-dimensional correlation:
in the formula, S ref (n) is a reference signal, and the upper symbol indicates the complex sumYoke, Y' k The target echo signals after clutter suppression are represented, N is the total received data length, N =1,2,3.
Compared with the prior art, the clutter suppression method of the external radiation source radar based on the 5G OFDM signal is provided by utilizing the CP-OFDM characteristic of the 5G signal in a comprehensive consideration mode, the method is different from the conventional subcarrier domain multipath clutter suppression algorithm in processing, the clutter component of zero Doppler frequency shift is suppressed by utilizing an ECA-C algorithm, and then the clutter subspace of each carrier is expanded into copies of two reference carriers in the subcarrier domain to suppress the clutter component with the Doppler frequency shift; the method can effectively inhibit multipath clutter interference and has unique advantages compared with the clutter inhibition method of the conventional external radiation source radar.
The previous description is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (4)
1. A clutter suppression method for an external radiation source radar based on a 5G OFDM signal is characterized by comprising the following steps: the method comprises the following steps:
s1, obtaining 5G OFDM reference signal S received by 5G OFDM external radiation source radar reference antenna ref (t) and 5G OFDM monitor signal S received by the monitor antenna surv (t)；
S2, reference signal S to be acquired ref (t) and a monitoring signal S surv (t) dividing the OFDM signal into a series of OFDM symbols, and performing discrete Fourier transform on the useful data part after removing the cyclic prefix to obtain a reference signal S of a subcarrier domain ref (n) and a monitoring signal S surv (n)；
S3, projecting the monitoring signal in the sub-carrier domain to an orthogonal clutter subspace, and filtering out multipath clutter components with zero Doppler frequency shift;
s4, expanding the clutter subspace of each carrier in a subcarrier domain, wherein the clutter subspace of each carrier is the subcarriers of two copied reference signals;
s5, projecting the monitoring signal with the multipath clutter of the zero Doppler frequency shift filtered to the expanded orthogonal clutter subspace, and filtering out multipath clutter components with the Doppler frequency shift;
and S6, performing distance-Doppler processing on the monitoring signal and the reference signal after clutter suppression, improving the signal-to-noise ratio of target detection, and realizing target detection.
2. The method for suppressing clutter of an external radiation source radar based on 5G OFDM signals as claimed in claim 1, wherein: in S4, the expanded kth subcarrier forms a clutter subspace representation:
C′ k ＝[Λ H C k C k ΛC k ]；
in the formula, superscript H denotes the conjugate transpose, Λ is the phase shift diagonal matrix, expressed as:
in the formula (f) dm Is the Doppler frequency, T s For the OFDM symbol duration, L is the number of OFDM symbols processed in parallel, thus constructing a new spur subspace represented as:
in the formula, the superscript H represents the conjugate transpose, and the superscript "-1" represents the inverse matrix.
3. The method for suppressing radar clutter of external radiation source based on 5G OFDM signal as claimed in claim 2, wherein: in S5, each subcarrier on the monitoring signal is usedAlong by T' k Orthogonal projection is carried out on the formed clutter subspace, so that the multipath clutter component monitoring signal with the Doppler frequency shift filtered is obtained by:
Y′ k ＝Y k (I-T′ k )；
wherein, I-T' k ＝I-C′ k (C′ k H C′ k ) -1 C′ k H Termed monitor Signal perpendicular to T' k Forming an orthogonal projection matrix of the clutter subspace;
wherein I is an identity matrix and Y is k The monitoring signal is used for suppressing multipath clutter with zero Doppler frequency shift.
4. The method for suppressing clutter of an external radiation source radar based on 5G OFDM signals as recited in claim 3, wherein: in S6, a reference signal S is used ref (n) and target echo signal Y 'after clutter suppression' k Performing distance-Doppler two-dimensional correlation processing:
in the formula, S ref (n) is a reference signal, and symbol denotes a complex conjugate, Y' k The target echo signals after clutter suppression are represented, N is the total received data length, N =1,2,3.
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| CN116660856A (en) * | 2023-08-02 | 2023-08-29 | 南京信息工程大学 | 5G time slot synchronization-based external radiation source radar signal processing method |
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Cited By (4)
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| CN116660856A (en) * | 2023-08-02 | 2023-08-29 | 南京信息工程大学 | 5G time slot synchronization-based external radiation source radar signal processing method |
| CN116660856B (en) * | 2023-08-02 | 2023-11-21 | 南京信息工程大学 | 5G time slot synchronization-based external radiation source radar signal processing method |
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