CN108549061B - Signal clustering method - Google Patents
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- CN108549061B CN108549061B CN201810371330.XA CN201810371330A CN108549061B CN 108549061 B CN108549061 B CN 108549061B CN 201810371330 A CN201810371330 A CN 201810371330A CN 108549061 B CN108549061 B CN 108549061B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
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Abstract
The invention relates to a signal clustering method in the field of electromagnetic environment signal monitoring, which firstly receives a machine-readable pulse description word PDWiThen according to the pulse description word PDWiOrientation of (Doa)iCarrier frequency RfiCalculating the PDWiThe index address of (a); then to PDWiJudging the contents stored in the index address, if the orientation DoaiIf the next adjacent index address has no channel number mark, then detecting the same orientation DoaiCarrier frequency Rf ofiAn upper adjacent index address; judging the content stored in the index address, judging whether there is a channel number mark, if the carrier frequency RfiIf the upper adjacent index address has no channel number mark, the same direction Doa is detectediCarrier frequency Rf ofiA next-neighbor index address; the invention provides a method for indexing an address hash table, which can cluster the intercepted signals in real time and quickly and ensure that one hundred percent of the intercepted signals are acquired; and also uses the orientation DoaiAnd carrier frequency RfiThe upper and lower adjacent association of the signal carrier enables the carrier of the signal not to split due to movement or frequency agility of radar signals, and guarantees that the signal can be correctly sorted in subsequent signal processing.
Description
Technical Field
The invention relates to a signal clustering method in the field of electromagnetic environment signal monitoring.
Background
Due to the intensive, complex and variable modern electromagnetic environment, received signals are very intensive, if the signals are not classified and diluted, the signals are difficult to separate quickly, and particularly when high-repetition-frequency signals and low-repetition-frequency signals are mixed together, the low-repetition-frequency signals are submerged and cannot be separated; in order to adapt to the external pulse density of 100 ten thousand per second, the processing time of each pulse is less than 1us, the pulse cannot be lost, and a hundred percent of acquired signals are ensured; there are many existing clustering methods, such as: the methods such as neural network, vector machine, kalman filter, etc. all take much time and are difficult to be widely applied to engineering.
Disclosure of Invention
The invention provides a method for indexing an address hash table, which can cluster the intercepted signals in real time and quickly and ensure that one hundred percent of the intercepted signals are acquired; at the same time, the orientation Doa is also appliediAnd carrier frequency RfiAre related to each other, so that the carrier of the signal isThe frequency of the motion or radar signals is agile without splitting, and the signal can be correctly sorted by subsequent signal processing.
The purpose of the invention is realized as follows:
step one, reading a pulse description word PDW from a receiveriI represents the number of input pulses;
step two, according to the pulse description word PDWiOrientation of (Doa)iCarrier frequency RfiCalculating the PDWiThe index address of (a);
step three, aligning the PDWiJudging the content stored in the index address, judging whether a channel number mark exists, and if so, judging the PDWiDirectly storing the channel number into a corresponding channel number;
step four, if no channel number mark exists, calculating the same carrier frequency RfiOrientation of (Doa)iAn upper adjacent index address; judging the content stored in the index address, judging whether a channel number mark exists, if so, storing the channel number into the PDWiAnd PDW is added to the index address ofiStoring the channel number into a corresponding channel number;
step five, if the orientation DoaiIf the upper adjacent index address has no channel number mark, the same carrier frequency Rf is detectediOrientation of (Doa)iA next-neighbor index address; judging the content stored in the index address, judging whether a channel number mark exists, if so, storing the channel number into the PDWiAnd PDW is added to the index address ofiStoring the channel number into a corresponding channel number;
step six, if the orientation DoaiIf the next adjacent index address has no channel number mark, then detecting the same orientation DoaiCarrier frequency Rf ofiAn upper adjacent index address; judging the content stored in the index address, judging whether a channel number mark exists, if so, storing the channel number into the PDWiAnd PDW is added to the index address ofiStoring the channel number into a corresponding channel number;
step seven, if the carrier frequency RfiIf the upper adjacent index address has no channel number mark, the same direction Doa is detectediCarrier frequency Rf ofiLower adjacent ropeA reference address; judging the content stored in the index address, judging whether a channel number mark exists, if so, storing the channel number into the PDWiAnd PDW is added to the index address ofiStoring the channel number into a corresponding channel number;
step eight, if at carrier frequency RfiIf no channel number mark is found in both the upper and lower neighbors, then the new channel number is assigned to AddjAnd combining PDWiStoring the channel number into a new channel number; then, the step 1 is carried out, the pulse is continuously read, and the cycle is repeated.
The invention operates by first receiving a PDW from a receiveriAccording to orientation DoaiAnd carrier frequency RfiEstablishing index address, searching whether establishing channel number exists in corresponding address, if so, then establishing PDWiStoring the data into corresponding channels; if there is no channel number, then the carrier frequency Rf is pressed firstiFind the upper and lower neighbors if carrier frequency RfiIf there is a channel number in the upper and lower neighbors, the channel number is stored in the address of the index, and the PDW is storediStoring the data into corresponding channels; if at carrier frequency RfiIf no channel number is found in the upper and lower channels, then the direction Doa is again usediWhether there is a channel number or not is searched in the upper and lower neighbors of (1), if the direction DoaiIf there is a channel number in the upper and lower neighbors, the channel number is stored in the address of the index, and the PDW is storediStoring the data into corresponding channels; if in the orientation DoaiAnd carrier frequency RfiIf no channel number is found in the upper and lower neighbors, a new channel number is assigned to the PDWiAnd storing the channel number in the indexed address, and repeating the steps to obtain the same-orientation DoaiSame carrier frequency RfiThe signals are gathered in the same channel for signal processing and fast sorting of various signals, and as most modern radars are frequency agile radars, in order to place frequency points of the agile radars in the same channel, carrier frequency Rf is compared during channel buildingiThe number of the upper and lower neighbors is determined by the agility range, the agility range is generally determined at 1Ghz, and the platform carrying the radar is not static and generally moves, so that the direction Doa is searched when the channel is builtiAdjacent to each other, considering the orientation DoaiIs not changed slowly by the orientation DoaiWhile the channel is split.
The method has the advantages that the method for indexing the address hash table can cluster the intercepted signals in real time and quickly, and ensures that one hundred percent of the intercepted signals are acquired; at the same time, the orientation Doa is also appliediAnd carrier frequency RfiThe upper and lower adjacent association of the signal carrier enables the carrier of the signal not to split due to movement or frequency agility of radar signals, and guarantees that the signal can be correctly sorted in subsequent signal processing.
Drawings
FIG. 1 is a flow chart of the operation of the present invention.
Detailed Description
The purpose of the invention is realized as follows: firstly, the received radar pulse electromagnetic wave is quantized into a pulse description word PDW through measurementi(ii) a Pulse description word PDWiIncluding direction of incoming waves DoaiDoa, frequency Rf, arrival time Toa, pulse width Pw, pulse amplitude Pa, and the like; then rapid clustering is started, the method is as follows:
step one, reading a pulse description word PDW from a receiveriI represents the number of input pulses;
step two, according to the pulse description word PDWiOrientation of (Doa)iCarrier frequency RfiCalculating the PDWiThe index address of (a);
step three, to PDWiJudging the content stored in the index address, judging whether a channel number mark exists, and if so, judging the PDWiDirectly storing the channel number into a corresponding channel number;
step four, if no channel number mark exists, calculating the same carrier frequency RfiOrientation of (Doa)iAn upper adjacent index address; judging the content stored in the index address, judging whether a channel number mark exists, if so, storing the channel number into the PDWiAnd PDW is added to the index address ofiStoring the channel number into a corresponding channel number;
step five, if the orientation DoaiIf the upper adjacent index address has no channel number mark, thenDetecting co-carrier frequency RfiOrientation of (Doa)iA next-neighbor index address; judging the content stored in the index address, judging whether a channel number mark exists, if so, storing the channel number into the PDWiAnd PDW is added to the index address ofiStoring the channel number into a corresponding channel number;
step six, if the orientation DoaiIf the next adjacent index address has no channel number mark, then detecting the same orientation DoaiCarrier frequency Rf ofiAn upper adjacent index address; judging the content stored in the index address, judging whether a channel number mark exists, if so, storing the channel number into the PDWiAnd PDW is added to the index address ofiStoring the channel number into a corresponding channel number;
step seven, if the carrier frequency RfiIf the upper adjacent index address has no channel number mark, the same direction Doa is detectediCarrier frequency Rf ofiA next-neighbor index address; judging the content stored in the index address, judging whether a channel number mark exists, if so, storing the channel number into the PDWiAnd PDW is added to the index address ofiStoring the channel number into a corresponding channel number;
step eight, if at carrier frequency RfiIf no channel number mark is found in both the upper and lower neighbors, then the new channel number is assigned to AddjAnd combining PDWiStoring the channel number into a new channel number; then, the step 1 is carried out, the pulse is continuously read, and the cycle is repeated.
When the invention is in use, the water-saving device,
1) reading a pulse description word PDW from a receiveriI represents the number of input pulses;
2) get pulse description word PDWiOrientation of (Doa)iCarrier frequency RfiAssume that the Doa resolution is 0.352oRf is 1Mhz, and is expressed by 10 and 16 bits, respectively, and the orientation Doa is calculatediAddress of (Doaadd)iAnd carrier frequency RfiAddress of (Rfadd)i(ii) a Will DoaiShielding off the lower two bits, RfiMasking off the lower five bits, i.e. DoaiTwo bits to the right as Doaaddi＝Doai>>2，RfiRight-shifted five bits are denoted as Rfaddi＝Rfi>>5，Addi＝Rfaddi<<8+ Doaaddi，AddiIs the PDWiThe index address of (a); i.e. Doa at 1.4oThe input pulse of Rf within the range of 32Mhz is the same index address;
3) judging the content stored in the index address, judging whether there is a channel number mark, if there is the mark, the PDW is processediDirectly storing the channel number into a corresponding channel number;
4) if there is no channel number flag, then the co-carrier frequency Rf is detectediOrientation of (Doa)iAn upper adjacent channel; calculating co-carrier frequency RfiOrientation of (Doa)iThe index address Add [ j ] of the upper adjacent channel]＝[Rfaddi+(Doaaddi－j)]Where j is the search orientation DoaiThe upper neighbor, j ═ 1, 2, … …, typically a maximum of 2; for Add [ j ]]Judging whether a channel number mark exists or not, if so, giving the channel number to AddiAnd combining PDWiStoring the channel number into a corresponding channel number; then, turning to the step 1 and continuing to read the pulse;
5) if the orientation DoaiIf the upper adjacent index address has no channel number mark, the same carrier frequency Rf is detectediOrientation of (Doa)iA next-neighbor index address; calculating co-carrier frequency RfiOrientation of (Doa)iAdjacent index Address Add [ j ]]＝[Rfaddi+(Doaaddi+j)]Where j is the search orientation DoaiThe number of neighbors below, j ═ 1, 2, … …, typically a maximum of 2; for Add [ j ]]Judging whether a channel number mark exists or not, if so, giving the channel number to AddiAnd combining PDWiStoring the channel number into a corresponding channel number; then, turning to the step 1 and continuing to read the pulse;
6) if the orientation DoaiIf the next adjacent index address has no channel number mark, then detecting the same orientation DoaiCarrier frequency Rf ofiAn upper adjacent index address; computing same-orientation DoaiCarrier frequency RfiUpper adjacent index address Add j of]＝[(Rfaddi-j)+ Doaaddi]Where j is the search carrier frequency RfiThe neighbor number of the upper neighbor, j 1, 2, … …, where j is 16 at maximum and applies to the frequencyThe frequency agility range is 1 Ghz; for Add [ j ]]Judging whether a channel number mark exists or not, if so, giving the channel number to AddiAnd combining PDWiStoring the channel number into a corresponding channel number; then, turning to the step 1 and continuing to read the pulse;
7) if carrier frequency RfiIf the upper adjacent index address has no channel number mark, the same direction Doa is detectediCarrier frequency Rf ofiA next-neighbor index address; computing same-orientation DoaiCarrier frequency RfiAdjacent index Address Add [ j ]]＝[(Rfaddi+j)+ Doaaddi]Where j is the search carrier frequency RfiThe adjacent number of the upper neighbors, j is 1, 2, … …, wherein j is less than or equal to 16, and the applicable frequency agility range is 1 Ghz; for Add [ j ]]Judging whether a channel number mark exists or not, if so, giving the channel number to AddiAnd combining PDWiStoring the channel number into a corresponding channel number; then, turning to the step 1 and continuing to read the pulse;
8) if at carrier frequency RfiIf no channel number mark is found in the upper and lower neighbors, then the new channel number is given to AddjAnd combining PDWiStoring the channel number into a new channel number; then, the step 1 is carried out, the pulse is continuously read, and the cycle is repeated.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (1)
1. A method for clustering signals, characterized in that,
step one, reading a pulse description word PDW from a receiveriI represents the number of input pulses;
step two, according to the pulse description word PDWiOrientation of (Doa)iCarrier frequency RfiCalculating the PDWiThe index address of (a);
step three, aligning the PDWiThe contents stored in the index address are judged and judgedWhether there is a channel number mark or not, if there is the mark, the PDW is processediDirectly storing the channel number into a corresponding channel number;
step four, if no channel number mark exists, calculating the same carrier frequency RfiOrientation of (Doa)iAn upper adjacent index address; judging the content stored in the index address, judging whether a channel number mark exists, if so, storing the channel number into the PDWiAnd PDW is added to the index address ofiStoring the channel number into a corresponding channel number;
step five, if the orientation DoaiIf the upper adjacent index address has no channel number mark, the same carrier frequency Rf is detectediOrientation of (Doa)iA next-neighbor index address; judging the content stored in the index address, judging whether a channel number mark exists, if so, storing the channel number into the PDWiAnd PDW is added to the index address ofiStoring the channel number into a corresponding channel number;
step six, if the orientation DoaiIf the next adjacent index address has no channel number mark, then detecting the same orientation DoaiCarrier frequency Rf ofiAn upper adjacent index address; judging the content stored in the index address, judging whether a channel number mark exists, if so, storing the channel number into the PDWiAnd PDW is added to the index address ofiStoring the channel number into a corresponding channel number;
step seven, if the carrier frequency RfiIf the upper adjacent index address has no channel number mark, the same direction Doa is detectediCarrier frequency Rf ofiA next-neighbor index address; judging the content stored in the index address, judging whether a channel number mark exists, if so, storing the channel number into the PDWiAnd PDW is added to the index address ofiStoring the channel number into a corresponding channel number;
step eight, if at carrier frequency RfiIf no channel number mark is found in both the upper and lower neighbors, then the new channel number is assigned to AddjAnd combining PDWiStoring the channel number into a new channel number; then, the step 1 is carried out, the pulse is continuously read, and the cycle is repeated.
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| CN113075637B (en) * | 2021-04-29 | 2022-06-07 | 中国船舶重工集团公司第七二三研究所 | Airborne PD radar signal sorting method based on pulse descriptor data compression |
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