CN-122017747-A - Method for detecting diversity signals in real time simultaneously

CN122017747ACN 122017747 ACN122017747 ACN 122017747ACN-122017747-A

Abstract

The application discloses a method for detecting simultaneous diversity signals in real time, and belongs to the technical field of radar signal reconnaissance. The method for detecting and measuring the simultaneous diversity signals in real time comprises the following steps of S1, full-channel signal detection and parameter measurement, S2, hierarchical buffer management of pulse description words, S3, matching detection and fusion processing of the simultaneous diversity signals, S4, data rebuffering and detection circulation, and the method for detecting and measuring the simultaneous diversity signals in real time, which is provided by the application, aims at technical pain points that a traditional digital channelized radar reconnaissance receiver is difficult to detect the simultaneous diversity signals in real time and effectively, realizes accurate and real-time detection and parameter extraction of the simultaneous diversity signals through hierarchical buffer management, fixed reference matching fusion and core design of closed loop circulation detection, has excellent engineering realizability and scene suitability, realizes breakthrough in the aspects of signal detection performance, processing instantaneity, hardware landing property, engineering practicability and the like, and greatly improves the signal processing capacity of a radar reconnaissance system in a complex electromagnetic environment.

Inventors

ZHANG HONGWEI
LI XIAOPENG
CHENG XIAOHUI
SUN ZHAN
ZHU GUOJUN
CHENG WENJUN
SHI KEYU

Assignees

西安迅尔电子有限责任公司

Dates

Publication Date: 20260512
Application Date: 20260414

Claims (9)

1. Meanwhile, the diversity signal real-time detection method is characterized by comprising the following steps of: S1, full-channel signal detection and parameter measurement, namely performing down-conversion, sampling and digital channelizing processing on a radio frequency signal received by a radar reconnaissance receiver, and performing signal detection and parameter measurement on output data of each channel to generate a pulse description word PDW; S2, hierarchical buffer storage management of pulse description words, namely setting three groups of first-in first-out buffer storage FIFO which are respectively a first FIFO used for storing PDWs to be processed, a second FIFO used for storing PDWs which do not meet fusion conditions in the detection of the current round, and a third FIFO used for storing PDWs which are newly input when the detection module is in a data processing state; S3, performing matching detection and fusion processing on simultaneous diversity signals, namely starting buffer Time counting when a first PDW is written in a first FIFO, setting a detection module to be in a data processing state when the count reaches a preset buffer Time Time0, stopping writing the PDWs into the first FIFO, wherein the value of the preset buffer Time Time0 is not more than the arrival Time tolerance of the simultaneous diversity signals, reading all PDW data in the first FIFO, taking the first read PDWs as fixed unique reference PDWs, recording the arrival Time of the reference PDWs as t0, sequentially performing fusion condition matching on all PDWs remained in the first FIFO and the reference PDWs, performing fusion processing on the PDWs meeting the fusion condition and the reference PDWs together, generating PDWs corresponding to the simultaneous diversity signals, outputting the PDWs not meeting the fusion condition, storing the PDWs into a second FIFO, and finishing judgment on all PDWs in the first FIFO; and S4, data re-caching and detecting circulation, namely after all PDWs in the first FIFO are processed, sequentially reading all PDWs in the second FIFO and writing the PDWs into the first FIFO, recording the arrival time of the first read PDWs in the second FIFO as t1, sequentially reading all PDWs in the third FIFO and writing the PDWs into the first FIFO after the second FIFO is emptied, and after the second FIFO and the third FIFO are emptied, setting a detecting module into an idle state, and jumping to the step S3 to execute the next round of simultaneous diversity signal detection.
2. The method for real-time detection of simultaneous diversity signals according to claim 1, wherein the PDW generated in step S1 includes 67 core parameters including carrier frequency RF, pulse width PW, arrival time TOA, pulse amplitude PA, intra-pulse modulation scheme, modulation bandwidth BW, and arrival angle AOA.
3. The method for detecting simultaneous diversity signals in real time according to claim 2, wherein the fusion condition matching judgment criterion in the step S3 is that the arrival time TOA difference value, the pulse width PW difference value, the pulse amplitude PA difference value, the modulation bandwidth BW and the arrival angle AOA difference value of the PDW to be matched and the reference PDW are respectively smaller than tolerance threshold values which are independently preset by each parameter, the intra-pulse modulation modes of the PDW to be matched and the reference PDW are completely consistent, and the PDW meeting all the conditions is judged to be consistent with the fusion condition.
4. The method for detecting simultaneous diversity signals in real time according to claim 3, wherein in the step S3, the specific method for performing the fusion processing on the PDW meeting the fusion condition and the reference PDW is as follows: average value calculation is carried out on the reference PDWs participating in fusion and all PDWs meeting fusion conditions, namely the arrival time TOA, the pulse width PW, the pulse amplitude PA, the modulation bandwidth BW and the arrival angle AOA of the reference PDWs are respectively carried out, so that TOA, PW, PA, BW and arrival angle AOA parameters corresponding to the diversity signals PDW are generated; the carrier frequency RF of all PDWs participating in fusion is reserved as a multi-carrier frequency parameter of the simultaneous diversity signal PDWs; And modifying the pulse modulation mode parameter into a simultaneous diversity signal type, and updating the number parameter of the sub-pulses in the simultaneous diversity signal PDW according to the total number of the PDWs participating in fusion.
5. The method of claim 1, wherein in step S3, when the preset buffering Time Time0 is reached, only 1 PDW data exists in the first FIFO when the first FIFO is read, the PDW data is directly output, and the detection module is set to be in an idle state, and the step S4 is skipped to execute the data re-buffering process.
6. The method of claim 1, wherein in the step S4, when the PDWs in the second FIFO are read, if there are multiple PDWs in the second FIFO, a difference Deltat between the arrival time of each subsequent PDW and t1 is calculated, if there are only 1 PDWs in the second FIFO, a difference Deltat between t1 and the arrival time t0 of the reference PDW in the step S3 is used as Deltat, when the PDWs in the third FIFO are read, a difference Deltat between the arrival time of each PDW in the third FIFO and t1 is calculated, and the next round of buffer time count is based on the Deltat as a time offset start basis.
7. The method for real-time detection of simultaneous diversity signals according to claim 1, wherein in said single fusion processing in step S3, the parameter bit width of the number of recording sub-pulses is 4 bits, and the maximum number of sub-pulses of compatible processing simultaneous diversity signals is 16.
8. The method for detecting the simultaneous diversity signals in real time according to claim 1, wherein the method is characterized in that the full-flow signal detection, parameter measurement, cache management, fusion matching and cyclic scheduling logic are realized in parallel through Field Programmable Gate Array (FPGA) hardware.
9. A real-time detection and measurement device for simultaneous diversity signals, applied to a digital channelized radar reconnaissance receiver, comprising: the full-channel detection module is used for sampling and digitally channelizing radio frequency signals received by the radar reconnaissance receiver, detecting signals and measuring parameters of output data of each channel, and generating pulse description words PDW corresponding to each single pulse signal; The system comprises a hierarchical buffer module, a full channel detection module, a first FIFO (first in first out) buffer module, a second FIFO buffer module and a third FIFO buffer module, wherein three groups of first in first out buffer FIFOs are built in and are respectively a first FIFO for storing PDWs to be processed, a second FIFO for storing PDWs which do not meet fusion conditions in the detection of the current round, and a third FIFO for storing PDWs which are newly input when the detection module is in a data processing state; The system comprises a first FIFO, a second FIFO, a diversity detection fusion module, a fusion processing module, a first PDW fusion processing module, a second PDW fusion processing module, a first PDW fusion processing module and a second PDW fusion processing module, wherein the first PDW is written in the first FIFO, the first PDW is kept in an idle state and the buffer Time count is started, when the count reaches a preset buffer Time Time0, the data state is set to be in a data processing state, the writing of newly generated PDWs to the first FIFO is stopped, the value of the preset buffer Time Time0 is not larger than the arrival Time tolerance of the simultaneous diversity signals, the buffer is ensured to be completed by all sub-pulses of the same group of simultaneous diversity signals, all PDW data in the first FIFO are read, the arrival Time of the first read PDW is taken as a fixed unique reference PDW, all PDWs are recorded, all PDWs remained in the first FIFO are respectively fused with the reference PDWs in a fusion condition, the PDWs meeting the fusion condition are fused together, PDWs corresponding to the reference PDWs are generated and output, and PDWs which do not meet the fusion condition are stored in the second FIFO, and all PDWs in the first FIFO are judged to be matched with the fusion condition of the reference PDWs; The cyclic scheduling module is used for sequentially reading all PDWs in the second FIFO and writing the PDWs into the first FIFO according to the reading sequence after all PDWs in the first FIFO are processed, recording the arrival time of the first read PDWs in the second FIFO as t1, sequentially reading all PDWs in the third FIFO and writing the PDWs into the first FIFO according to the reading sequence after the second FIFO is emptied, and setting the simultaneous diversity detection fusion module into an idle state after the second FIFO and the third FIFO are emptied, and triggering the simultaneous diversity detection fusion module to execute the next round of simultaneous diversity signal detection.

Description

Method for detecting diversity signals in real time simultaneously Technical Field The invention relates to the technical field of radar signal reconnaissance, in particular to a method for detecting simultaneous diversity signals in real time. Background In the field of modern electronic warfare, the game of radar and radar countermeasure is continuously updated, radar signal reconnaissance is a core basic link of a radar countermeasure system, and the capability of real-time detection, accurate parameter measurement and type identification of radar signals is a core premise that a radar jammer can effectively interfere with an enemy radar. In order to resist the interference of the enemy, various radar waveforms with anti-interference capability are widely applied, wherein diversity signals are a waveform system commonly used by an advanced radar system by virtue of excellent anti-interference performance. The simultaneous diversity signal refers to that the radar simultaneously transmits pulse signals with a plurality of different carrier frequencies, and a plurality of sub-pulses of the signals have consistent arrival time, pulse width, pulse amplitude, intra-pulse modulation mode and modulation bandwidth, and only carrier frequencies are different. The diversity mode of multi-carrier simultaneous transmission can greatly reduce the interception probability and interference efficiency of a radar jammer, and the signal detection capability of the traditional radar reconnaissance receiver forms a serious challenge. The current mainstream radar reconnaissance system generally adopts a digital channelized receiver architecture, and the traditional digital channelized signal detection and measurement method only aims at processing independent pulse signals in a single channel, and pulse descriptions are generated by taking the intercepted pulses in each channel as independent radar signals, so that the correlation identification of homologous sub-pulses which cross channels and arrive simultaneously is difficult to realize in real time and accurately. When the traditional method is adopted to process the simultaneous diversity signals, whether the intercepted multiple pulses belong to the same group of simultaneous diversity signals cannot be judged, the existence marks of the simultaneous diversity signals cannot be output, key characteristic parameters such as the number of sub-pulses, the carrier frequency of each sub-pulse, the frequency difference among the sub-pulses and the like of the simultaneous diversity signals cannot be accurately extracted, so that a radar jammer cannot formulate a matched interference strategy for the signals, and the interference effect on a radar adopting the simultaneous diversity signals is seriously weakened. In addition, the existing detection scheme for simultaneous diversity signals has the problems of high computational complexity, large processing delay and large occupation of hardware resources, engineering landing is difficult to realize on embedded hardware platforms such as FPGA (field programmable gate array) and the like, the real-time, high reliability and miniaturized application requirements of a modern radar reconnaissance system on signal processing cannot be met, meanwhile, the number of adaptive simultaneous diversity signal sub-pulses is limited, and the main flow application requirements in an actual reconnaissance scene are difficult to cover. Disclosure of Invention The present invention is directed to a method for detecting diversity signals in real time, so as to solve the problems set forth in the background art. In order to achieve the above purpose, the present invention provides the following technical solutions: The method for detecting diversity signals in real time comprises the following steps: Step S1, full-channel signal detection and parameter measurement, namely performing down-conversion, sampling and digital channelizing processing on radio frequency signals received by a radar reconnaissance receiver, performing signal detection and parameter measurement on output data of each channel, and generating pulse description words PDW corresponding to each single pulse signal; Step S2, hierarchical buffer storage management of pulse description words, namely setting three groups of first-in first-out buffer storage FIFO which are respectively a first FIFO for storing PDWs to be processed, a second FIFO for storing PDWs which do not meet fusion conditions in the detection of the current round, and a third FIFO for storing PDWs which are newly input when a detection module is in a data processing state; Step S3, performing matching detection and fusion processing on simultaneous diversity signals, namely, when a first PDW is written in a first FIFO, keeping an idle state by a detection module, starting buffer Time counting, setting the detection module to be in a data processing state when the count reaches a preset buffer Time Time0, stoppin