CN109738888B - Cognitive intra-pulse linear frequency modulation pulse compression navigation radar system - Google Patents
Cognitive intra-pulse linear frequency modulation pulse compression navigation radar system Download PDFInfo
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Abstract
The invention relates to the technical field of navigation radars, in particular to a cognitive intra-pulse linear frequency modulation pulse compression navigation radar system. The system comprises a radar transmitter, a radar receiver, a target detection processing unit, a perception memory unit, a scene cognition unit, a working memory unit and a control execution unit. The invention realizes the effective matching between the radar emission signal and the radar working environment, improves the working efficiency of the radar, reduces the pollution of radar radiation to the environment, gives consideration to the contradiction between the detection and the resolution of the near and far targets, solves the problem that the monitoring and the tracking of the near and far targets of the traditional ship navigation radar cannot be simultaneously taken consideration, and can obtain stronger clutter suppression capability and target detection performance.
Description
Technical Field
The invention relates to the technical field of navigation radars, in particular to a cognitive intra-pulse linear frequency modulation pulse compression navigation radar system.
Background
At present, whether the pulse compression radar is a traditional magnetron pulse radar or an intra-pulse line frequency modulation pulse compression radar which is recently popularized and applied, the working mode is always a fixed parameter working mode in which parameters such as a transmission pulse width, a pulse repetition frequency and the like are changed along with the manual change of a working range, and the waveform parameters and the signal characteristics can not respond to the target of a detection space, the adjacent clutter distribution characteristics and the geographical environment characteristics of a water area. The narrow pulse mode radar detection distance under the short range is limited, so that reliable tracking and monitoring cannot be performed on objects at a relatively large range, when the long range is monitored, the long range objects need to be re-established for tracking, the monitoring and tracking of the long range objects and the short range objects are difficult to be compatible, and the effective monitoring capability of the omnidirectional objects is limited. Further, when working in different types of waters, the characteristics of the target environment are different, the marine radar often unnecessarily transmits detection pulses to many spaces, and at the same time, too much energy is often unnecessarily used when many targets are detected, the radar efficiency cannot be optimized for each target, efficient and energy-saving detection cannot be achieved, and the influence of the radar on the environmental electromagnetic radiation cannot be reduced as much as possible. Therefore, according to the technical thought of the cognitive radar, the marine radar has cognitive analysis capability on the perception information of the target environment, and selectively controls the transmitted signal parameters according to the perception information, so that the working mode of the radar is corresponding to the characteristics of the detection environment, the target detection is performed in an environment-friendly green mode, and a feedback control structure for receiving the transmission is structurally formed.
In recent years, the research and development of the cognitive radar technology are rapid, the research results are endless, and particularly, the research has not been paid attention to in the fields of full-adaptive waveform optimization research and some military application insensitive to cost, and in the fields of marine radar and other common civil application sensitive to cost.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a cognitive intra-pulse chirped pulse compression navigation radar system.
In order to achieve the above object, the technical scheme of the present invention is as follows:
a cognitive intra-pulse linear frequency modulation pulse compression navigation radar system comprises a radar transmitter, a radar receiver, a target detection processing unit, a perception memory unit, a scene cognition unit, a working memory unit and a control execution unit.
A. The radar transmitter is used for transmitting a combined pulse microwave signal which is formed by three linear frequency modulation sub-pulses, wherein the waveform parameters of the combined pulse microwave signal are changed along with the radar environment;
B. the radar receiver is used for receiving echo signals generated by transmitting and reflecting the transmitting signals, and pulse compression and time sidelobe suppression are realized through matching receiving and windowing processing;
C. the target detection processing unit is used for carrying out non-coherent accumulation processing and clutter suppression processing, namely target detection processing, between sub-pulses and between combined pulses on the echo digital video signal after pulse compression; land echo mask and target detection are realized by utilizing the electronic chart information and AIS information; sensing the spatial distribution characteristics of radar targets, estimating radar clutter statistical characteristic parameters, land echo distribution and the like, and storing the sensing information into a sensing memory;
D. the sensing memory unit takes the azimuth as an index and is used for storing sensing information of target space distribution, radar clutter intensity, target echo intensity of a weak target and sensing information of geographic environment of a radar working water area, finishing detection processing of a static background during sensing work, recording the sensing information as land sensing information, and updating the stored information according to an antenna scanning period;
E. the scene cognition unit cognizes a land area by utilizing AIS and GIS auxiliary information and a shoreline detection and land area judgment algorithm aiming at target perception information from a perception memory, carries out parameterized cognition analysis on target spatial distribution characteristics and clutter distribution characteristics, realizes the cognition function of a radar system on the target distribution area, clutter environment and a non-radar detection area, and stores the cognition information into a working memory by taking azimuth as an index;
F. the working memory unit is used for storing cognitive information about the distance distribution state of the targets and the clutter environment of the targets in all the existing orientations of the targets;
G. the control execution unit generates waveform control parameters according to the waveform selection criteria based on the cognitive information from the working memory, controls the transmitter to generate required transmitting signals, calculates the minimum acting distance and the maximum acting distance of each sub-pulse and the achievable combined pulse accumulation number, sends the parameters to the non-coherent accumulation detection processor of the receiver, and controls the realization of non-coherent accumulation processing and target detection processing of echo signals. In addition, the control executor also changes control to realize the conversion control of the sensing working state and the cognitive control working state of the radar.
Compared with the prior art, the invention has the following beneficial effects:
1. due to the feedback structure of perception cognition and control between the transceiver ring joints, the effective matching between the radar transmitting signals and the radar working environment is realized;
2. the wave form parameter of the transmitting signal of the radar is matched with the working environment of the radar, so that unnecessary transmission is reduced, the working efficiency of the radar is improved, and the pollution of radar radiation to the environment is reduced;
3. the contradiction between the detection and the resolution of the short-distance and long-distance targets is considered;
4. the problem that the monitoring and tracking of the far and near targets of the traditional ship navigation radar cannot be simultaneously considered is solved;
5. a stronger clutter suppression capability and target detection performance can be obtained.
Drawings
FIG. 1 is a block diagram of a cognitive ship navigation radar system of the present invention;
FIG. 2 is a diagram of a sub-combination pulse waveform of a radar transmit signal according to the present invention;
fig. 3 is a diagram of the radar transmit pulse group structure of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
A cognitive molded line frequency modulation pulse navigation radar system comprises a radar transmitter, a radar receiver, a target detection processing unit, a perception memory unit, a scene cognition unit, a working memory unit and a control execution unit, wherein the control execution unit is shown in figure 1;
A. the radar transmitter is used for transmitting a combined pulse microwave signal, the waveform parameters of which change along with the radar environment, and the combined pulse microwave signal is formed by three linear frequency modulation sub-pulses, and the form of the combined pulse microwave signal is shown in figure 2;
B. the radar transmitter continuously transmits an un-transmitted pulse group consisting of M combined pulses under the control of the control carton unit, as shown in fig. 3, wherein M is the accumulated number of pulse groups which can be realized under the condition of the current waveform parameters;
C. the radar receiver is used for receiving detection echoes from the monitoring area and realizing pulse compression through matching reception;
D. the target detection processing unit is used for carrying out non-coherent accumulation processing and clutter suppression processing, namely target detection processing, between sub-pulses and between combined pulses on the echo digital video signal after pulse compression; the detection processing unit can give out the perception of the spatial distribution characteristics of radar targets, the estimation of radar clutter statistical characteristic parameters, the land echo distribution and the like, and store the perception information into the perception memory;
E. the sensing memory unit takes the azimuth as an index and is used for storing sensing information of target space distribution, radar clutter intensity, target echo intensity of a weak target and sensing information of geographic environment of a radar working water area, finishing detection processing of a static background during sensing work, recording the sensing information as land sensing information, and updating the stored information according to an antenna scanning period;
F. the scene cognition unit cognizes a land area by using AIS and GIS information as auxiliary information and a shoreline detection and land area judgment algorithm aiming at target perception information from a perception memory, carries out parameterized cognition analysis on target spatial distribution characteristics and clutter distribution characteristics, realizes cognition functions of a radar system on the target distribution area, clutter environment and a non-fee radar detection area, and stores the cognition information into a working memory by using azimuth as an index;
G. the working memory unit is used for storing cognitive information about the distance distribution state of the targets and the clutter environment of the targets in all the existing orientations of the targets;
H. the control execution unit generates waveform control parameters according to waveform selection criteria based on cognitive information from the working memory, controls the transmitter to generate required transmitting signals, calculates the minimum acting distance and the maximum acting distance of sub-pulses and the achievable combined pulse accumulation number M, sends the parameters to the target detection processor unit, and controls and realizes non-coherent accumulation processing and target detection processing of echo signals; in addition, the control executor also controls and realizes the conversion control of the sensing working state and the cognitive control working state of the radar.
The control of the transmitted waveform parameters comprises two basic stages of sensing and cognition;
the basic process of the radar scene perception phase is as follows: 1) Initial detection and initial setting of control parameters of a system; 2) Radar echo signal mask processing based on land areas and non-radar detection areas with DIS information; 3) Analyzing the target space distribution characteristics; 4) Updating the information record of the sensing memory, and updating the working memory after analysis and processing; 5) The sensing detection of this sensing phase is ended.
The machine emission signal is divided into two basic phases, namely a scene perception emission phase and a scene perception emission phase:
the basic process of the radar scene perception phase is: 1) The system initial detection and control parameters are initially set and pulse groups are transmitted; 2) The detection processing unit is used for carrying out radar echo signal mask processing on the land area with GIS information and the non-radar detection area; 3) Analyzing the target space distribution characteristics; 4) Updating the information record of the sensing memory, and updating the working memory after analysis and processing; 5) The sensing detection of this sensing phase is ended.
The basic process of the cognitive control phase of the transmitted signal is as follows: 1) Reading the cognitive information and the previous control parameters from the working memory and the control execution memory, and determining the control parameters according to a control strategy; 2) According to the determined control parameters and the available pulse accumulation number M, sending M parameters to a detector, and controlling a transmitting signal to continuously transmit by taking M pulse groups as a group; 3) Reading the cognitive information after the second group of transmission, estimating and judging whether the discovery probability reaches the requirement, and adjusting the control parameters if necessary; 4) Repeating the processes of 2) to 3) within the azimuth range determined by the increment of the working memory; 5) Adding the address offset 11 to the working memory address, and repeating the processes of 1) to 4) until the cognitive control of the current antenna azimuth scanning period is completed; 6) The process of the stage 1) to 5) is continuously carried out for P antenna azimuth scanning periods (P can be determined according to the target motion condition and the target distance, and when a short-distance rapid motion target exists, the P is properly reduced) and the stage 1 is returned.
Claims (1)
1. A cognitive molded line frequency modulation pulse navigation radar system comprises a radar transmitter, a radar receiver, a target detection processing unit, a perception memory unit, a scene cognition unit, a working memory unit and a meta control execution unit;
A. the radar transmitter is used for transmitting a combined pulse microwave signal which is formed by three linear frequency modulation sub-pulses, wherein the waveform parameters of the combined pulse microwave signal are changed along with the radar environment;
B. the radar receiver is used for receiving echo signals generated by the reflection of signals transmitted by the transmitter, and pulse compression and time sidelobe suppression are realized through matching reception and windowing processing;
C. the target detection processing unit is used for carrying out non-coherent accumulation processing and clutter suppression processing, namely target detection processing, between sub-pulses and between combined pulses on the echo digital video signal after pulse compression; land echo mask and target detection are realized by utilizing the electronic chart information and AIS information; giving out the perception of the spatial distribution characteristics of radar targets, radar clutter statistical characteristic parameter estimation and land echo distribution, and storing the perception information into a perception memory unit;
D. the sensing memory unit takes the azimuth as an index and is used for storing sensing information of target space distribution, radar clutter intensity, target echo intensity of a weak target and sensing information of geographic environment of a radar working water area, finishing detection processing of a static background during sensing work, recording the sensing information as land sensing information, and updating the stored information according to an antenna scanning period;
E. the scene cognition unit cognizes a land area by utilizing AIS and GIS auxiliary information and a shoreline detection and land area judgment algorithm aiming at target perception information from a perception memory, carries out parameterized cognition analysis on target spatial distribution characteristics and clutter distribution characteristics, realizes the cognition function of a radar system on the target distribution area, clutter environment and a non-radar detection area, and stores the cognition information into a working memory by taking azimuth as an index;
F. the working memory unit is used for storing cognitive information about the distance distribution state of the targets and the clutter environment of the targets in all the existing orientations of the targets;
G. the control execution unit generates waveform control parameters according to waveform selection criteria based on cognitive information from the working memory, controls the transmitter to generate required transmitting signals, calculates the minimum acting distance and the maximum acting distance of each sub-pulse and the achievable combined pulse accumulation number, sends the parameters to a non-coherent accumulation detection processor in the receiver, and controls to realize non-coherent accumulation processing and target detection processing of echo signals; in addition, the control executor also controls and realizes the conversion control of the sensing working state and the cognitive control working state of the radar.
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| CN1154479A (en) * | 1996-01-13 | 1997-07-16 | 大连海事大学 | Method and system for radar signal recording, transmitting and treatment with zone controllable function |
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