CN115792801B - Multi-machine cross positioning radiation source signal matching method based on space criterion - Google Patents
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Abstract
The invention relates to a multi-machine cross positioning radiation source signal matching method based on a space criterion, which comprises the following steps: each carrier independently carries out multi-radiation source distinguishing and database identifying on the local received signals; the positioning host receives signals to be matched from all the carriers, selects similar signals from the received signals to carry out database numbering matching, if the matching is successful, carries out space criterion checking, otherwise carries out multidimensional parameter association matching, if the matching is successful, carries out space criterion checking, otherwise, fails to match, and ends the current signal matching process; when checking the space criterion, if the checking is not passed, judging that the signals come from different radiation sources and the matching is failed, otherwise, judging that the signals belong to the same radiation source and the matching is successful. Compared with the prior art, the method can accurately match the radiation source information received by different carriers in a complex electromagnetic environment, distinguish the same signals sent by different targets in the same area, avoid misunderstanding and ensure the accuracy of multi-machine co-location.
Description
Technical Field
The invention relates to the technical field of multi-machine passive positioning, in particular to a multi-machine cross positioning radiation source signal matching method based on a space criterion.
Background
The active positioning (Active Localization) is a technology for positioning the target through active equipment such as a radar, a sonar and a laser, and has the advantages of stability and high precision. However, active positioning systems rely on transmitting high power signals, receiving the same reflected signals, and calculating the distance between the two parties with the back and forth time of the signals from the active device to the target to achieve positioning. Therefore, the active positioning system is easy to expose itself, and is found by the opposite side, so that an electronic defense method such as anti-electronic reconnaissance is adopted, the positioning accuracy is greatly reduced, even soft killing such as electronic interference and electronic spoofing and hard killing such as electromagnetic injury and anti-radiation weapon attack are suffered, and great hidden danger is caused to the safety of the positioning system.
Passive localization (Passive Localization) then achieves localization by receiving intentional, unintentional radiation or reflected signals of the target, i.e., without transmitting electromagnetic wave signals to the outside to detect the position of the target, and only achieves detection, localization and tracking of the scout target by receiving electromagnetic wave signals. The received electromagnetic wave signal can be a signal directly radiated by the target, or can be a signal reflected and scattered after the external radiation source irradiates the target. Thus, passive positioning can be classified into passive positioning based on the target radiation signal and passive positioning based on the irradiation of the external radiation source, depending on the source from which the electromagnetic wave signal is received by the positioning system. Classification may also be based on other features: according to the number of the positioning stations, the method is divided into single-station passive positioning and multi-station passive positioning, wherein the multi-station passive positioning is characterized in that radiation source signals are detected and processed from different directions through a plurality of measuring stations distributed at different positions, and then the target position is determined in a direction line crossing resolving mode, so that the method is fast in speed and high in accuracy compared with the single-station positioning; the observation platform can be divided into land-based, carrier-based and air-based, and the airborne passive positioning system has the advantages of long acting distance, large coverage area, good maneuverability and the like compared with the land-based and carrier-based passive positioning system. Therefore, the dual-machine or multi-machine passive positioning is the passive positioning technology which is most beneficial to being applied to the military field by virtue of the advantages, and has high practical value.
Compared with active positioning, the positioning system for passive positioning does not emit electromagnetic wave signals to the outside, has the characteristics of good concealment, long acting distance, strong survivability and the like, and has wide application in civil and national defense fields. However, passive positioning still has a great progress space in the aspects of effective signal interception, parameter measurement, system processing capacity, positioning precision, speed and the like. For example, multi-machine co-location requires that signals from the same source be selected from the received signals to achieve cross-location resolution. The multi-machine passive positioning research at home and abroad mainly adopts simple target signal characteristics, such as carrier frequency for signal distinction, or directly aims at the marine single target to perform positioning under the simple electromagnetic radiation environment, and for the formation target with the near marine distance and multiple radiation sources, the signal screening and matching under the complex condition can not be satisfied, so that the engineering application of the current multi-machine passive positioning is restricted.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a multi-machine cross positioning radiation source signal matching method based on space criteria, which can accurately match information received by different carriers in a complex electromagnetic environment, distinguish the same signals sent by different targets in the same area, avoid misunderstanding and further ensure the accuracy of multi-machine co-positioning.
The aim of the invention can be achieved by the following technical scheme: a multi-machine cross positioning radiation source signal matching method based on space criteria comprises the following steps:
s1, each carrier independently distinguishes a signal received by the carrier through multiple radiation sources and identifies a database, marks the signal and then sends the signal to a positioning host;
S2, the positioning host receives signals to be matched from all the carriers, selects similar signals from the received signals and matches the similar signals with database numbers, if the matching is successful, the step S4 is executed, otherwise, the step S3 is executed;
S3, carrying out multidimensional parameter association matching on the signals to be matched, if the parameter association matching is successful, executing a step S4, otherwise, judging that the matching is failed, and ending the current signal matching process;
S4, checking the space criteria of each signal, if the checking is not passed, judging that the signals come from different radiation sources, indicating that the matching is failed, ending the current signal matching process, otherwise, judging that the signals belong to the same radiation source, indicating that the matching is successful, and performing subsequent cross positioning calculation.
Further, the step S1 specifically includes the following steps:
s11, each carrier independently distinguishes multiple radiation sources from a signal received by the carrier to determine whether the received signal is a single radiation source or multiple radiation sources, and corresponding labeling is carried out;
s12, each carrier independently carries out database identification on the signal received by the carrier, if the identification is successful, the corresponding database number is used as a marking parameter of the signal to be stored, and then the signal is sent to the positioning host;
If the identification is unsuccessful, the signal is directly sent to the positioning host.
Further, the specific process of multi-target differentiation in step S11 is as follows:
s111, the carrier selects signals needing to be subjected to collaborative cross positioning from all received signals;
S112, judging the number of the radiation sources of each signal according to the direction-finding information of the signal, namely through the direction, so as to distinguish the signal as a single radiation source or multiple radiation sources.
Further, the step S2 specifically includes the following steps:
s21, the positioning host receives signals to be matched from all carriers, firstly judges whether the received signals are multi-radiation source signals or single-radiation source signals, if the signals are judged to be multi-radiation source signals, the step S22 is executed, and if the signals are judged to be single-radiation source signals, the step S23 is executed;
S22, the positioning host screens out signals which are matched with the signal direction of the multiple radiation sources and have the same signal characteristics from the signals received by the positioning host;
Then, database serial number matching is carried out on the multi-radiation source signals and the screened signals, if the database serial numbers of the two signals are the same, the matching is successful, then step S4 is executed, otherwise, the matching is unsuccessful, and step S3 is executed;
S23, the positioning host screens out signals with the same signal characteristics as the single radiation source from the signals received by the positioning host, database number matching is carried out, if the database numbers of the signals are the same, the matching is successful, then step S4 is executed, otherwise, the matching is unsuccessful, and step S3 is executed.
Further, the step S3 specifically performs association matching on three parameters of carrier frequency, repetition period and pulse width in each signal.
Further, the carrier frequency parameter association matching in the step S3 includes carrier frequency type matching and carrier frequency value matching; the repetition period parameter association matches include repetition period type matches and repetition period value matches.
Further, the carrier parameter association matching process in step S3 specifically includes:
1) Carrier frequency type matching: if the carrier frequency types of the radiation source signals are different, the matching fails;
2) Carrier frequency value matching: if the carrier frequency types of the radiation source signals are the same, matching is further carried out according to the following rules:
a) Fixed carrier frequency matching rules: the carrier frequency value phase difference is smaller than a set tolerance range a, and the matching is successful;
b) Agile carrier matching rules: and if the upper and lower limit coverage rate of the carrier frequency is larger than the set first threshold range, the matching is successful.
Further, the process of repeating the cycle parameter association matching in step S3 specifically includes:
1) Repetition period type matching: if the types of the repetition periods of the radiation source signals are different, the matching is failed;
2) Repetition period value matching: if the repetition period types of the radiation source signals are the same, matching is further performed according to the following rules:
a) Fixed repetition period matching rules: the difference of the repetition period values is smaller than the set tolerance b, and the matching is successful;
b) Jitter repetition period matching rules: the coverage rate of the upper limit and the lower limit of the repetition period is larger than a set second threshold range, and the matching is successful;
c) Repeat period spread: if the spread series are the same and the difference of each spread value is smaller than a set tolerance b; the match is successful.
Further, the rule of pulse width parameter association matching in the step S3 specifically includes: the pulse width difference of the signal parameters is within a set tolerance range c, and the matching is successful.
Further, the specific process of step S4 is as follows: the method comprises the steps of carrying out cross positioning on each radiation source signal to obtain a target position, firstly judging whether the directions of the radiation source signals are in the same direction, if so, continuously judging whether the target position is in the line-of-sight cross range of each carrier, if so, indicating that the matching is successful, otherwise, the matching is failed.
Compared with the prior art, the method comprises the steps of judging whether the signal radiation source is a single radiation source or a multi-radiation source, wherein the multi-radiation source is used for ensuring that signals come from the same radiation source through azimuth judgment, then carrying out database identification, then adopting multidimensional parameters to match signals received by different carriers, and carrying out space criterion verification after database number matching or parameter matching so as to check a target position. Therefore, the radiation source matching can be accurately carried out on the information received by each carrier, and the same signals sent by different targets in the same area can be distinguished. The invention adopts a data fusion algorithm, solves the problem of confirming the same radiation source signal in the process of cross positioning and resolving, and is beneficial to providing a unique and correct positioning result by multi-machine cooperative positioning through checking the space criterion.
In the invention, each carrier carries out database advance identification on the signals received by the carrier, and the positioning host carries out matching judgment by using the database number, so that the signals can be ensured to be matched quickly.
In the invention, aiming at the signals of unsuccessful database number matching, the data sent by the multi-carrier are further fused, and the multidimensional parameters detected by the radiation sources such as time domain, space domain, frequency domain and the like are utilized for carrying out association matching, so that the matching accuracy can be effectively improved.
The method and the device further introduce a space judgment criterion for the signals successfully matched with the database numbers or successfully matched with the multidimensional parameter association so as to reliably distinguish the same radiation signals of different targets in the same area, thereby improving the accuracy of target identification.
Drawings
FIG. 1 is a schematic flow chart of the method of the present invention;
FIG. 2 is a schematic diagram of an application process of an embodiment;
FIGS. 3a and 3b are schematic diagrams illustrating multi-source signal discrimination in an embodiment;
FIG. 4 is a schematic diagram of the effect of spatial criteria;
Fig. 5a and 5b are schematic diagrams illustrating space criterion checking in the embodiment.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples.
Examples
As shown in fig. 1, a multi-machine cross positioning radiation source signal matching method based on a space criterion comprises the following steps:
s1, each carrier independently distinguishes a signal received by the carrier through multiple radiation sources and identifies a database, marks the signal and then sends the signal to a positioning host;
S2, the positioning host receives signals to be matched from all the carriers, selects similar signals from the received signals and matches the similar signals with database numbers, if the matching is successful, the step S4 is executed, otherwise, the step S3 is executed;
S3, carrying out multidimensional parameter association matching on the signals to be matched, if the parameter association matching is successful, executing a step S4, otherwise, judging that the matching is failed, and ending the current signal matching process;
S4, checking the space criteria of each signal, if the checking is not passed, judging that the signals come from different radiation sources, indicating that the matching is failed, ending the current signal matching process, otherwise, judging that the signals belong to the same radiation source, indicating that the matching is successful, and performing subsequent cross positioning calculation.
By applying the technical scheme, as shown in fig. 2, the embodiment mainly includes the following contents:
step one, radiation source identification and location
Each carrier independently analyzes signals received by the carrier, firstly selects signals needing to be subjected to collaborative cross positioning, judges the number of radiation sources of the signals according to direction finding information of the signals, confirms whether a plurality of targets emit signals with the same parameters, and marks; and then, carrying out database identification, comparing the signals with the signals in the database of the database, and considering that the identification is successful if the signals meet the requirements of a certain difference value, or else, the identification is unsuccessful. If the identification is successful, the database number which is successfully identified is used as a parameter of the radiation source to be stored, the signal is sent to the positioning host, and if the identification is unsuccessful, the signal is directly sent to the positioning host. And then executing the second step.
Step two, database number matching
After receiving signals to be matched of other aircraft platforms, the positioning host firstly judges whether the signals belong to multi-radiation-source signals, if yes, signals matched with the orientations of the multi-radiation-source signals are selected from the signals with the same characteristics received by the positioning host, so that database number matching judgment is carried out, and if the signals with the single radiation source are the signals, the signals with the same characteristics received by the positioning host are directly matched with the signals with the same characteristics.
And when the database number parameters of the two signals are matched with each other, the matching is primarily successful, the step four is executed, and if the numbers are different or no number exists, the step three is executed.
Step three, parameter association
And matching three parameters of carrier frequency, repetition period and pulse width in the radiation source signal. If all three parameters are successfully associated, the three parameters are considered to belong to the same radiation source, the fourth step is executed, otherwise, the matching is failed, and the next signal matching is executed.
Step four, checking space criteria
And carrying out space criterion checking on the target, carrying out cross positioning on signals successfully matched with database numbers or successfully matched with parameter association to obtain a target position, firstly judging whether the target signal azimuth is in the same direction, and then judging whether the target position is in the line-of-sight cross range of two positioning aircrafts, if so, carrying out space criterion checking, successfully matching the signals, and enabling the calculated target position to be used. Otherwise, the matching fails, and the matching of the next signal is performed.
Specifically, in the first step, the method includes:
1) Multiple radiation source differentiation
The signal to be positioned is first selected and the number of radiation sources is determined, and whether a plurality of targets radiate the same signal (multiple radiation sources) is determined. If the same signal has multiple radiation sources, the direction-finding angles are used for direction division (as shown in fig. 3a and 3 b), and the signal to be positioned is selected and sent to the positioning host. If the signal to be located has only one radiation source, the following steps are directly continued.
2) Database identification
Each aircraft platform carries out database identification on signals to be positioned, and identification parameters comprise carrier frequency, repetition period, pulse width, carrier frequency type and repetition period type; in signal identification, the signal types (carrier frequency type and repetition period type) must be the same; identification criteria for stable signals: when the central values of the carrier frequency, the repetition period and the pulse width of the detection signal are all within the upper limit and the lower limit (including equal) of the corresponding parameters of the loading signal, the identification is considered to be successful; the recognition criterion of the special parameters of the special signals is that the recognition of the special parameters is successful when the overlapping percentage of the carrier frequency range (agile signal) or the repetition period range (jitter signal) relative to the parameters of two signals (a loading signal and a detecting signal) is more than or equal to 80 percent; the identification of each detection signal is carried out from the first batch to the last batch of the database, and when the number of successful batches is greater than 1 batch, the optimal identification is carried out. Labeling after identification and sending a signal to a host.
In the second step, after receiving the signal of the slave machine (i.e. different aircraft platforms), the master machine first judges whether the signal is a multi-radiation source signal, if so, the master machine also judges the azimuth of the similar signal received by the master machine, and picks out the signal with the azimuth matched with the signal of the slave machine to carry out subsequent work. If the radiation source is a single radiation source, the subsequent work is directly carried out.
The host matches the received signal with the own signal, and different airplanes have uniqueness to the serial numbers of the same identified signal in the database, so that the matching confirmation of different airplanes to the known signal can be realized by comparing the serial numbers of the database.
If the number parameters of the databases marked by the signals to be matched are the same, the signals are considered to be preliminarily successful in matching, and space criterion checking is carried out (namely, the step four is executed). If the database number parameters are different, the parameter association is performed (i.e., step three is performed).
In the third step, the multidimensional parameter association matching mainly includes:
1) Carrier frequency association
A) Carrier frequency type matching: if the carrier frequency types of the radiation source signals are different, the matching fails;
b) Carrier frequency value matching: if the carrier frequency types of the radiation source signals are the same, the matching rule is as follows:
Fixed carrier frequency matching rules: the carrier frequency value phase difference is smaller than a certain tolerance range a, and the matching is successful;
agile carrier matching rules: and if the upper and lower limit coverage rate of the carrier frequency is larger than a certain range, the matching is successful.
2) Repetition period matching
A) Repetition period type matching: if the types of the repetition periods of the radiation source signals are different, the matching is failed;
b) Repetition period value matching: if the repetition period types of the radiation source signals are the same, the further matching rule is as follows:
fixed repetition period matching rules: the difference of the repetition period values is smaller than a certain tolerance b, and the matching is successful;
Jitter repetition period matching rules: the coverage rate of the upper limit and the lower limit of the repetition period is larger than a certain range, and the matching is successful;
Repeat period spread: if the spread series are the same and each spread value is smaller than a certain tolerance b, the matching is successful.
3) Pulse width matching
The pulse width matching criterion is that the pulse width difference of the signal parameters is within a certain tolerance range c, and the matching is successful.
In the fourth step, spatial domain criterion checking is performed on signals with successful database matching or successful parameter association: referring to fig. 4, fig. 5a and fig. 5B, with the arrival angle of the radiation source of the platform being a, the arrival angle of another radiation source of the platform being B, determining whether the angle A, B is from the same side airspace of the formation, and simultaneously determining whether the target is in the common line-of-sight intersection area of the carrier, if so, completing signal matching, and performing cross positioning calculation; if not, the next signal matching is performed without checking through the space criterion, and the matching fails.
As can be seen from the above, the technical scheme provides a multi-machine cross positioning radiation source signal matching method based on a space criterion, which solves the problem of confirmation of the same radiation source signal in the cross positioning resolving process by adopting a data fusion algorithm, and is beneficial to providing a unique and correct positioning result for multi-station co-positioning by checking the space criterion. According to the technical scheme, whether the target radiation source is a single radiation source or not is judged firstly (azimuth judgment is needed by the multi-radiation source, signals are ensured to come from the same radiation source), database identification is carried out, signals received by different aircraft platforms are matched by adopting multi-dimensional parameters, space criterion verification is carried out after the signals are matched, and the target position is checked, so that the radiation source information received by each aircraft can be accurately matched, the same signals sent by different targets in the same area can be distinguished, and in practical application, such as for offshore formation, signal distinction of the targets of the offshore formation is facilitated, and a foundation can be laid for realizing collaborative cross positioning of the targets in the offshore formation by the multi-aircraft platforms. The technical scheme has wide application prospect in screening and confirming the same radiation source signal in multi-machine cooperative positioning, and can assist engineering application of passive positioning.
Claims (6)
1. A multi-machine cross positioning radiation source signal matching method based on a space criterion is characterized by comprising the following steps:
s1, each carrier independently distinguishes a signal received by the carrier through multiple radiation sources and identifies a database, marks the signal and then sends the signal to a positioning host;
S2, the positioning host receives signals to be matched from all the carriers, selects similar signals from the received signals and matches the similar signals with database numbers, if the matching is successful, the step S4 is executed, otherwise, the step S3 is executed;
S3, carrying out multidimensional parameter association matching on the signals to be matched, if the parameter association matching is successful, executing a step S4, otherwise, judging that the matching is failed, and ending the current signal matching process;
S4, checking the space criteria of each signal, if the checking is not passed, judging that the signals come from different radiation sources, indicating that the matching is failed, ending the current signal matching process, otherwise, judging that the signals belong to the same radiation source, indicating that the matching is successful, and performing subsequent cross positioning calculation;
the step S1 specifically comprises the following steps:
s11, each carrier independently distinguishes multiple radiation sources from a signal received by the carrier to determine whether the received signal is a single radiation source or multiple radiation sources, and corresponding labeling is carried out;
s12, each carrier independently carries out database identification on the signal received by the carrier, if the identification is successful, the corresponding database number is used as a marking parameter of the signal to be stored, and then the signal is sent to the positioning host;
If the identification is unsuccessful, directly transmitting a signal to a positioning host;
The specific process of multi-radiation source differentiation in step S11 is as follows:
s111, the carrier selects signals needing to be subjected to collaborative cross positioning from all received signals;
s112, judging the number of the radiation sources of each signal according to the direction-finding information of the signal, namely, through the direction, so as to distinguish the signal as a single radiation source or multiple radiation sources;
the step S2 specifically comprises the following steps:
s21, the positioning host receives signals to be matched from all carriers, firstly judges whether the received signals are multi-radiation source signals or single-radiation source signals, if the signals are judged to be multi-radiation source signals, the step S22 is executed, and if the signals are judged to be single-radiation source signals, the step S23 is executed;
S22, the positioning host screens out signals which are matched with the signal direction of the multiple radiation sources and have the same signal characteristics from the signals received by the positioning host;
Then, database serial number matching is carried out on the multi-radiation source signals and the screened signals, if the database serial numbers of the two signals are the same, the matching is successful, then step S4 is executed, otherwise, the matching is unsuccessful, and step S3 is executed;
S23, the positioning host screens out signals with the same signal characteristics as the single radiation source from the signals received by the positioning host, database number matching is carried out, if the database numbers of the signals are the same, the matching is successful, then step S4 is executed, otherwise, the matching is unsuccessful, and step S3 is executed;
The specific process of step S4 is: and carrying out cross positioning on each radiation source signal to obtain a target position, firstly judging whether the directions of the radiation source signals are in the same direction, if so, continuously judging whether the target position is in the line-of-sight cross range of each carrier, if so, indicating successful matching, otherwise, failing matching.
2. The method for matching signals of multiple cross-positioning radiation sources based on spatial criteria according to claim 1, wherein the step S3 specifically includes performing correlation matching on three parameters of carrier frequency, repetition period and pulse width in each signal.
3. The method for matching multi-machine cross positioning radiation source signals based on space criterion according to claim 2, wherein the carrier frequency parameter association matching in step S3 includes carrier frequency type matching and carrier frequency value matching; the repetition period parameter association matches include repetition period type matches and repetition period value matches.
4. The method for matching signals of multiple cross-positioning radiation sources based on spatial criteria according to claim 3, wherein the carrier parameter association matching process in step S3 specifically comprises the following steps:
1) Carrier frequency type matching: if the carrier frequency types of the radiation source signals are different, the matching fails;
2) Carrier frequency value matching: if the carrier frequency types of the radiation source signals are the same, matching is further carried out according to the following rules:
a) Fixed carrier frequency matching rules: the carrier frequency value phase difference is smaller than a set tolerance range a, and the matching is successful;
b) Agile carrier matching rules: and if the upper and lower limit coverage rate of the carrier frequency is larger than the set first threshold range, the matching is successful.
5. The method for matching signals of multiple cross-positioning radiation sources based on spatial criteria according to claim 3, wherein the process of repeating the periodic parameter association matching in step S3 specifically comprises:
1) Repetition period type matching: if the types of the repetition periods of the radiation source signals are different, the matching is failed;
2) Repetition period value matching: if the repetition period types of the radiation source signals are the same, matching is further performed according to the following rules:
a) Fixed repetition period matching rules: the difference of the repetition period values is smaller than the set tolerance b, and the matching is successful;
b) Jitter repetition period matching rules: the coverage rate of the upper limit and the lower limit of the repetition period is larger than a set second threshold range, and the matching is successful;
c) Repeat period spread: if the spread series are the same and the difference of each spread value is smaller than a set tolerance b; the match is successful.
6. The method for matching signals of multiple cross-positioning radiation sources based on spatial criteria according to claim 2, wherein the rule of pulse width parameter association matching in step S3 is specifically as follows: the pulse width difference of the signal parameters is within a set tolerance range c, and the matching is successful.
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