CN108226869B - Detection method of radar signal with multiple frequency spread - Google Patents
Detection method of radar signal with multiple frequency spread Download PDFInfo
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- CN108226869B CN108226869B CN201711332289.7A CN201711332289A CN108226869B CN 108226869 B CN108226869 B CN 108226869B CN 201711332289 A CN201711332289 A CN 201711332289A CN 108226869 B CN108226869 B CN 108226869B
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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
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Abstract
The invention discloses a method for detecting radar signals of repetition frequency spread. The method comprises the following steps: performing histogram analysis on TOA of an input pulse stream PDW, and counting the number PRITOtal of all effective sub-periods, the value PRIVALUE [ i ] of each effective sub-period, the number PRIIN [ i ] of occurrences and a pulse address pair PRIADdr [ i ]; for each effective subcycle PRI, counting all time intervals of the effective subcycle PRI in the PDW sequence; counting the minimum time interval of repeated occurrence of each valid subcycle PRI; determining whether a frequency spread signal is repeated, if so, determining a frame period, and turning to the next step; if not, exiting the detection, and indicating that no staggered signal exists in the input PDW; and determining the number of the effective sub-periods and the true value of each effective sub-period to finish the sorting of the repetition frequency staggered signals and the statistics of the repetition frequency parameters of the signals. The invention can accurately and effectively detect the double frequency staggered signal when the input pulse stream has more lost pulses or the total input pulse number is too small.
Description
Technical Field
The invention belongs to the technical field of electromagnetic environment signal monitoring, and particularly relates to a method for detecting radar signals with repeated frequency spread.
Background
In the traditional sorting of the PRI staggered signals, the number of the sub-periods and each sub-period are generally determined according to the histogram statistical condition, so that the occurrence frequency of each sub-period is required to be large, namely the number of pulses participating in sorting is enough to be counted accurately. When there are many missing pulses or the total input pulse number is too small (for example, when the narrowband receiver operates in the scan search mode for the wideband, the number of pulses received by one scan for a certain sub-band is small), the conventional sorting method is easy to sort into the jitter signal in such a case.
Disclosure of Invention
The invention aims to provide a method for detecting radar signals with repetition frequency dispersion, which can complete accurate sorting of PRI dispersion signals under the condition of more lost pulses or too few total input pulses.
The technical solution for realizing the purpose of the invention is as follows: a detection method of a radar signal with multiple frequency spread is characterized by comprising the following steps:
step 3, counting the minimum time interval of repeated occurrence of each effective sub-period PRI;
step 4, determining whether the frequency spread signal is repeated, if so, determining a frame period, and turning to step 5; if not, exiting the detection, and indicating that no staggered signal exists in the input PDW;
and 5, determining the number of the effective sub-periods and the true value of each effective sub-period, and finishing the separation of the multiple frequency staggered signals and the statistics of the multiple frequency parameters of the signals.
Further, step 2, for each valid sub-period, all time intervals of the valid sub-periods in the PDW sequence are counted, specifically as follows:
and (2) according to the histogram statistical result in the step (1), for the value PRIVALUE [ i ] of each effective sub-period, subtracting TOAs of pulses corresponding to the head addresses of all the pulse address pairs PRIADDr [ i ] which belong to the PRIVALUE [ i ] in a time sequence to obtain a PRIN [ i ] -1 value, and marking as FPRI [ i ] [ PRIN [ i ] -1 ].
Further, in step 3, the minimum time interval of repeated occurrence of the PRI in each valid sub-period is counted, specifically as follows:
for each valid sub-period PRI, counting all time intervals in which the valid sub-period PRI occurs according to the result of step 2, wherein the minimum value is the minimum time interval, and is denoted as minFPRI [ i ].
Further, in step 4, it is determined whether to re-frequency the spread signal, and if so, the frame period is determined, specifically as follows:
calculating the minimum value of an array minFPRI [ Total ] for all the effective sub-periods PRI, and recording as validFPRI; minFPRI [ Total ] is all time intervals in which all valid subcycle PRIs occur;
if any valid sub-period PRI value and the corresponding time interval group FPRI [ i ] [ PRIN [ i ] -1] are multiples of or equal to validFPRI, the valid sub-period PRI of the input signal is determined to be the repetition spread signal, and the frame period is validFPRI.
Further, in step 5, the number of the effective sub-periods and the true value of each effective sub-period are determined, and the separation of the multiple frequency staggered signals and the statistics of the multiple frequency parameters of the signals are completed, which is specifically as follows:
(1) calculating the maximum times Nmax of sub-periods under an ideal condition according to the TOA of the input PDW head and tail pulses and the frame period validFPRI; ideally, the loss rate of the pulse stream is 0, and Nmax is (TOA)Tail-TOAHead)/validFPRI；
(2) Selecting an effective sub-period PRI with the largest occurrence frequency from the histogram statistical result in the step 1, assuming that the effective sub-period PRI is an ith group, the occurrence frequency is PRIN [ i ], and if the loss probability of the receiver is less than 30%, the PRIN [ i ] is more than or equal to Nmax and 70%;
(3) and selecting a group with the maximum pulse number between every two adjacent groups and the time interval of the frame period as a complete effective sub-period distribution sample according to the address pair of the ith group of effective sub-periods PRI, carrying out effectiveness verification and confirming the number of effective sub-periods and the true value of each effective sub-period.
Further, the verifying the validity and confirming the number of valid sub-periods and the true value of each sub-period in the step (3) specifically includes:
and if the true value of the number of the statistical sub-periods is 2-8, determining the statistical sub-periods as the repeated frequency staggered signal, and if the statistical sub-periods are more than 8, determining the statistical sub-periods as the repeated frequency sliding signal.
Compared with the prior art, the invention has the following remarkable advantages: (1) when the input pulse stream has more lost pulses or the total input pulse number is too small (when the narrow-band receiver works in a scanning search mode of a wide-band section, the pulse number received at one time is less), the double-frequency staggered signal can be correctly and effectively detected; (2) the method can prevent the failure of identifying the target attribute and the threat level by the rear end and the final decision error of the command control system caused by the failure of correctly extracting the radiation source parameter of the PRI staggered signal.
Drawings
Fig. 1 is a general flow chart of the method for detecting a radar signal of a re-frequency spread of the present invention.
Fig. 2 is a flow chart of substep a of the method of detecting a radar signal of the present invention with re-frequency spread.
Detailed Description
The invention fully excavates and utilizes the time domain characteristics of the stagger signal, firstly determines the frame period (skeleton period), then extracts the number of the sub-periods and the sub-periods, analyzes and processes the TOA of the input pulse stream PDW and extracts the repetition frequency parameter of the radiation source, thus when more lost pulses or too few total input pulses are generated, the correct sorting of the PRI stagger signal can be completed.
Referring to fig. 1-2, the method for detecting a radar signal with heavy frequency spread according to the present invention, wherein RF is a carrier frequency, PW is a pulse width, DOA is an azimuth, TOA is a pulse arrival time, PRI is a pulse repetition interval, PDW is a pulse description word, and FPRI is a frame period, includes the following steps:
and (2) according to the histogram statistical result in the step (1), for the value PRIVALUE [ i ] of each effective sub-period, subtracting TOAs of pulses corresponding to the head addresses of all the pulse address pairs PRIADDr [ i ] which belong to the PRIVALUE [ i ] in a time sequence to obtain a PRIN [ i ] -1 value, and marking as FPRI [ i ] [ PRIN [ i ] -1 ].
Step 3, counting the minimum time interval of repeated occurrence of PRI in each effective sub-period, specifically as follows:
for each valid sub-period PRI, counting all time intervals in which the valid sub-period PRI occurs according to the result of step 2, wherein the minimum value is the minimum time interval, and is denoted as minFPRI [ i ].
Step 4, determining whether the frequency spread signal is repeated, if so, determining a frame period, and turning to step 5; if not, exiting the detection, and indicating that no staggered signal exists in the input PDW;
the determining whether to repeat the frequency staggered signal is performed, and if yes, determining the frame period, specifically as follows:
calculating the minimum value of an array minFPRI [ Total ] for all the effective sub-periods PRI, and recording as validFPRI; minFPRI [ Total ] is all time intervals in which all valid subcycle PRIs occur;
if any valid sub-period PRI value and the corresponding time interval group FPRI [ i ] [ PRIN [ i ] -1] are multiples of or equal to validFPRI, the valid sub-period PRI of the input signal is determined to be the repetition spread signal, and the frame period is validFPRI.
Step 5, determining the number of effective sub-periods and the true value of each effective sub-period, and completing the selection of the multiple frequency staggered signals and the statistics of the multiple frequency parameters of the signals, wherein the method specifically comprises the following steps:
(1) calculating the maximum times Nmax of sub-periods under an ideal condition according to the TOA of the input PDW head and tail pulses and the frame period validFPRI; (ideally, the loss rate of the pulse stream is 0, and Nmax is (TOA)Tail-TOAHead)/validFPRI)；
(2) Selecting an effective sub-period PRI with the largest occurrence frequency from the histogram statistical result in the step 1, assuming that the effective sub-period PRI is an ith group, the occurrence frequency is PRIN [ i ], and if the loss probability of the receiver is less than 30%, the PRIN [ i ] is more than or equal to Nmax and 70%;
(3) according to the address pair of the ith group of valid subcycles PRI, selecting a group with the most pulse number between every two adjacent groups and the time interval of the frame period as a complete valid subcycle distribution sample, carrying out validity verification and confirming the number of valid subcycles and the truth value of each valid subcycle, specifically:
and if the true value of the number of the statistical sub-periods is 2-8, determining the statistical sub-periods as the repeated frequency staggered signal, and if the statistical sub-periods are more than 8, determining the statistical sub-periods as the repeated frequency sliding signal.
Example 1
In order to achieve real-time and full-pulse processing of an input pulse stream, the present embodiment is based on a hardware architecture of an FPGA plus dual CPUs (CPUA, CPUB), wherein the FPGA is used for acquiring and caching PDW from a receiver in real time; the CPUA carries out pre-sorting on the PDW sent by the FPGA, carries out cluster analysis according to RF, PW and DOA parameters, forms a plurality of channels according to correlation, namely an initial signal tracking table, and carries out detailed analysis on the CPUB by timing switching; the CPUB utilizes various algorithms to further analyze the initial signal tracking table switched by the CPUA, extracts each radiation source signal and calculates detailed parameters of each radiation source signal. The sorting method of the invention is implemented in CPUB for the identification and extraction of the heavy frequency spread signals. The method comprises the following concrete steps:
1. pre-sorting an input pulse stream
And carrying out clustering processing on the input PDW according to parameters such as RF, PW, DOA and the like, putting pulses with correlation in the same channel, and switching to the next step at regular time.
2. Histogram analysis
A primary histogram analysis is performed on TOA (pulse arrival time) of a row of PDW, and the total number PRITOAL of effective PRI (pulse repetition interval) and the value PRIVALUE [ PRITOAL ], the number PRIIN [ PRITOAL ] of occurrences and the pulse address pair PRIADDr [ PRIOTAL ] of each effective PRI are counted.
3. Calculating the time interval of each valid PRI recurrence
According to the histogram statistical result, for each effective PRI value, taking the ith as an example, subtracting TOAs of pulses corresponding to the head addresses of all address pairs PRIADDr [ i ] belonging to PRIVALUE [ i ] from each other in time sequence to obtain PRIIN [ i ] -1 value, which is marked as FPRI [ i ] [ PRIN [ i ] -1 ].
4. Counting the minimum time interval of each valid PRI recurrence
For each valid PRI, take the ith as an example, count the minimum value of its corresponding array FPRI [ i ] [ PRIN [ i ] -1], and mark it as minFPRI [ i ].
5. Determining whether to re-frequency the spread signal, and if so, determining the frame period
For all valid PRIs, the minimum value of the array minFPRI [ Total ] is calculated and recorded as validFPRI. If any valid PRI value, for example, ith, corresponds to time interval group FPRI [ i ] [ PRIN [ i ] -1] being multiple or equal to validFPRI, then it is preliminarily determined that PRI of the input signal is the repetition spread signal and the frame period is validFPRI.
6. Determining the number of sub-periods and the truth value of each sub-period
The maximum number of sub-periods Nmax in an ideal situation is calculated according to the TOA of the head pulse and the tail pulse of the input PDW and the frame period validFPRI. Then, from the histogram statistics, select a PRI with the most number of occurrences, assuming the ith group, whose number of occurrences is PRIN [ i ] (if the receiver loss probability is <30%, PRIN [ i ] ≧ Nmax × 70%), and mark maxPRIN. And finally, according to the address pair of the ith group of PRI, selecting a group with the largest number of interval pulses between the two front and back groups and the time interval as a frame period as a complete sub-period distribution sample, taking the time interval between two adjacent pulses as a temporary sub-period tmpPri for verification, if the tmpPri belongs to PRIVALUE [ PRITATotal ], the tmpPri is the same as the ith value PRIVALUE [ i ], and the PRINTI and the MAXPRINTIN are within the tolerance range, confirming that the tmpPri is a sub-period true value Hper [ n ], adding 1 to the sub-period number n, and then taking the next interval for continuous verification until one frame period is finished, thereby obtaining a complete sub-period true value Hper and the number n. Because the number of the sub-periods of the multiple frequency spread signal is generally 2-8, if the true value of the number of the statistical sub-periods is 2-8, the multiple frequency spread signal is determined, and if the true value is more than 8, the multiple frequency slip signal is determined.
At this point, the repetition frequency parameter sorting is completed, and the repetition frequency parameter counting of the signal is also completed. The specific analysis flow is shown in figures 1-2, wherein a return 1 is shown in the figures, namely the sorting of the repetition frequency parameter difference signals is successful, the number of the sub-periods is n, each sub-period is Hper [ n ], and the frame period is validFPRI; and returning to 0, if the input pulse train is not the repetition frequency spread signal, switching to the next algorithm for continuous analysis.
In summary, when the number of missing pulses of the input pulse stream is large or the total input pulse number is too small (when the narrow-band receiver operates in the scanning search mode of the wide-band section, the number of pulses received at one time is small), the method of the present invention can correctly and effectively detect the double-frequency staggered signal, and prevent the failure of the identification of the rear-end target attribute and threat level and the final decision error of the command control system caused by the failure of correctly extracting the radiation source parameter of the PRI staggered signal.
Claims (4)
1. A detection method of a radar signal with multiple frequency spread is characterized by comprising the following steps:
step 1, performing histogram analysis on TOA of an input pulse stream PDW, and counting the number PRIITotal of all effective sub-periods, the value PRIVALUE [ i ] of each effective sub-period, the occurrence number PRIIN [ i ] and a pulse address pair PRIADDr [ i ], wherein i represents the number of the effective sub-period, i =1,2, … and PRIITotal;
step 2, for the value PRIVALUE [ i ] of each effective sub-period, counting all time intervals of the value PRIVALUE [ i ] of the effective sub-period in the PDW sequence, specifically as follows:
according to the histogram statistical result in the step 1, for the value PRIVALUE [ i ] of each effective sub-period, subtracting TOAs of pulses corresponding to the head addresses of all pulse address pairs PRIADDr [ i ] which belong to the PRIVALUE [ i ] pairwise according to the time sequence to obtain PRIIN [ i ] -1 values, and marking as FPRI [ i ] [ PRIN [ i ] -1 ];
step 3, counting the minimum time interval of repeated occurrence of the value PRIVALUE [ i ] of each effective sub-period, specifically as follows:
for each effective sub-period value PRIVALUE [ i ], counting the minimum value, namely the minimum time interval, and recording as minFPRI [ i ], according to all time intervals FPRI [ i ] [ PRIN [ i ] -1] in which the effective sub-period value PRIVALUE [ i ] obtained in the step 2; step 4, determining whether the frequency spread signal is repeated, if so, determining a frame period, and turning to step 5; if not, exiting the detection, and indicating that no staggered signal exists in the input PDW;
and 5, determining the number of the effective sub-periods and the true value of each effective sub-period, and finishing the separation of the multiple frequency staggered signals and the statistics of the multiple frequency parameters of the signals.
2. The method for detecting a radar signal with heavy frequency spread according to claim 1, wherein the step 4 determines whether to repeat the radar signal with heavy frequency spread, and if so, determines a frame period, specifically as follows:
calculating the minimum value of the array minFPRI [ Total ] for the values PRIValue [ i ] of all the effective sub-periods, and recording the minimum value as validFPRI; minFPRI [ Total ] is all time intervals in which the values PRI Value [ i ] of all valid sub-periods occur;
and if the value PRIVALUE [ i ] of any effective sub-period corresponds to the time interval group FPRI [ i ] [ PRIN [ i ] -1] which is multiple or equal to validFPRI, confirming that the effective sub-period PRI of the input signal is the repetition stagger signal and the frame period is validFPRI.
3. The method for detecting radar signals with multiple frequency spread according to claim 1, wherein the step 5 of determining the number of valid sub-periods and the true value of each valid sub-period completes the sorting of the multiple frequency spread signals and the statistics of the multiple frequency parameters of the signals, which is as follows:
(1) calculating the maximum times Nmax of sub-periods under an ideal condition according to the TOA of the input PDW head and tail pulses and the frame period validFPRI;
(2) selecting a value PRIVALUE [ i ] of an effective sub-period with the most occurrence times from the histogram statistical result in the step 1, assuming that the value is the ith group, the occurrence times is PRIIN [ i ], and if the loss probability of the receiver is less than 30%, the PRIIN [ i ] is more than or equal to Nmax 70%;
(3) and selecting a group with the most pulse number between every two adjacent groups and the time interval of the frame period as a complete effective sub-period distribution sample according to the address pair of the value PRIVALUE [ i ] of the ith group of effective sub-periods, carrying out effectiveness verification and confirming the number of the effective sub-periods and the true value of each effective sub-period.
4. The method for detecting radar signals with multiple frequency spread according to claim 3, wherein the step (3) of verifying the validity and confirming the number of valid sub-periods and the true value of each sub-period specifically comprises:
and if the true value of the number of the statistical sub-periods is 2-8, determining the statistical sub-periods as the repeated frequency staggered signal, and if the statistical sub-periods are more than 8, determining the statistical sub-periods as the repeated frequency sliding signal.
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