CN110687511B - Pulse timing sequence recovery method of radar signal simulator - Google Patents
Pulse timing sequence recovery method of radar signal simulator Download PDFInfo
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- CN110687511B CN110687511B CN201911111435.2A CN201911111435A CN110687511B CN 110687511 B CN110687511 B CN 110687511B CN 201911111435 A CN201911111435 A CN 201911111435A CN 110687511 B CN110687511 B CN 110687511B
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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
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- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
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Abstract
The invention provides a pulse timing recovery method of a radar signal simulator, which comprises the steps of reading a PDW data file, determining a receiver model according to the type of the simulator, carrying out corresponding pulse loss processing according to the type of the receiver model, and carrying out delayed sending according to the pulse arrival time. The invention can make the PDW sequence output by the simulator through the optical fiber keep consistent with the output time sequence of the real receiver in time sequence.
Description
Technical Field
The invention belongs to the technical field of radars, and particularly relates to a pulse timing sequence recovery method of a radar signal simulator.
Background
As an important technology in the field of electronic warfare, radar signal simulators are important devices that generate Pulse Description Word (PDW) sequences to provide input to signal sorting to optimize signal sorting algorithms.
In the process of outputting the PDW sequence, the recovery of the timing sequence is an important task, the conventional simulator does not consider that the receiver model performs pulse loss processing, the output PDW sequence does not have the output timing relationship of a real receiver, and the PDW sequence which is not close to a real scene is provided for signal sorting, so that the expected real effect is difficult to obtain when a signal sorting algorithm is optimized.
Disclosure of Invention
The invention aims to provide a pulse timing sequence recovery method of a radar signal simulator.
The technical solution for realizing the purpose of the invention is as follows: a pulse time sequence recovery method of a radar signal simulator comprises the following specific steps:
step 1, reading a PDW data file;
step 2, determining a receiver model according to the type of the simulator, and executing step 3 if the wide-open receiver model is selected; if the channelized receiver model is selected, executing the step 4;
step 3, deleting the PDW of the pulse if the radar pulse is out of the dynamic range of the wide-open receiver; otherwise, the PDW of the pulse is reserved;
in the PDWs of the reserved pulses, for PDWs which are overlapped in time, if the amplitude difference is smaller than a set threshold value, the PDW of the pulse which arrives first is reserved, and the PDW of the pulse which arrives later is deleted; otherwise, the PDW is completely reserved, and the step 5 is executed;
step 4, if the radar pulse is out of the dynamic range of the channelized receiver, deleting the PDW of the pulse; otherwise, the PDW of the pulse is reserved;
for PDWs with overlapping time, all the PDWs are reserved, and the PDWs are sent out according to the arrival sequence of the pulses;
step 5, generating a counter with an interval of t, setting the initial value of the counter as the arrival time TOA of the first PDW, and outputting the PDW;
reading the next PDW, and if the arrival time TOA of the PDW is less than or equal to the count value of the current counter, outputting the PDW; if the TOA of the PDW is larger than the count value of the counter, the PDW is output until the TOA of the PDW is equal to the count value of the counter.
Preferably, the PDW data file contains a PDW sequence of radar pulses.
Preferably, the set threshold is 6db.
Preferably, t is equal to the accuracy of the time of arrival TOA of PDW.
Compared with the prior art, the invention has the following remarkable advantages: (1) The invention can carry out loss processing of the pulse PDW sequence aiming at various receiver models; (2) The invention can make the PDW sequence output by the simulator through the optical fiber keep consistent with the output time sequence of the real receiver in time sequence.
The present invention is described in further detail below with reference to the attached drawings.
Drawings
Fig. 1 is a flowchart of a pulse timing recovery method of a radar signal simulator.
Fig. 2 is a schematic diagram of receiver model selection.
Fig. 3 is a schematic diagram of filtering out pulses outside the dynamic range of the receiver.
Fig. 4 is a schematic diagram of the loss processing of overlapping pulses by the wide-open receiver model.
Fig. 5 is a schematic diagram of the channelized receiver model's handling of missing overlapping pulses.
Fig. 6 is a schematic diagram of PDW timing recovery.
Detailed Description
A pulse time sequence recovery method of a radar signal simulator comprises the following specific steps:
step 1, reading a PDW data file, wherein the PDW data file comprises a PDW sequence of a plurality of radar pulses;
step 2, determining a receiver model according to the type of the simulator, and executing step 3 if the wide-open receiver model is selected; if the channelized receiver model is selected, executing the step 4;
in the PDW of the reserved pulse, for PDW with overlapping time, if the amplitude difference is smaller than a set threshold value, the PDW of the pulse which arrives firstly is reserved, and the PDW of the pulse which arrives later is deleted; otherwise, the PDW is completely reserved, and the step 5 is executed;
step 4, if the radar pulse is out of the dynamic range of the channelized receiver, deleting the PDW of the pulse; otherwise, the PDW of the pulse is reserved;
for PDW with overlapping time, all PDW are reserved, and PDW is sent out according to the arrival sequence of the pulses;
and 5, generating a counter with an interval of t, setting the initial value of the counter as the arrival time TOA of the first PDW, and outputting the PDW, wherein t is equal to the accuracy of the arrival time TOA of the PDW. (ii) a
Reading the next PDW, and if the arrival time TOA of the PDW is less than or equal to the count value of the current counter, outputting the PDW; if the time of arrival TOA of the PDW is larger than the count value of the counter, the PDW is sent to the optical fiber output module until the time of arrival TOA of the PDW is equal to the count value of the counter.
According to the invention, different receiver models are selected for carrying out pulse loss processing, and delay transmission is carried out according to the pulse arrival time, so that the defects are avoided, and the authenticity of the output PDW sequence is improved.
Example 1
A pulse timing recovery method of a radar signal simulator comprises the following steps:
step 1, reading a PDW data file, wherein the file comprises a PDW sequence of a plurality of radar pulses.
Step 2, as shown in fig. 2, selecting a receiver model, and if the wide-open receiver model is selected, executing step 3; if a channelized receiver model is selected, step 5 is performed.
Step 3, as shown in fig. 3, if the radar pulse is out of the dynamic range of the wide-open receiver, deleting the PDW of the pulse; otherwise, the PDW of the pulse is retained.
As shown in fig. 4, for PDWs that overlap in time, if the amplitude difference is less than 6db, the PDW of the pulse that arrives first is retained, and the PDW of the pulse that arrives later is deleted; otherwise, the PDW is all reserved.
Step 4, as shown in fig. 3, if the radar pulse is out of the dynamic range of the channelized receiver, deleting the PDW of the pulse; otherwise, the PDW of the pulse is retained.
As shown in fig. 5, for PDWs that overlap in time, all are retained and the PDWs are sent out in the order the pulses arrive.
And 5, as shown in fig. 6, generating a counter with an interval of 10nm by using a 100mHz clock, setting the initial value of the counter as the arrival time TOA of the first PDW, and sending the PDW to the optical fiber output module.
As shown in fig. 6, reading the next PDW, and if the arrival time TOA of the PDW is less than or equal to the count value of the counter at this time, immediately sending the PDW to the optical fiber output module; if the TOA of the PDW is larger than the count value of the counter, waiting until the TOA of the PDW is equal to the count value of the counter, and sending the PDW to the optical fiber output module.
Claims (4)
1. A pulse time sequence recovery method of a radar signal simulator is characterized by comprising the following specific steps:
step 1, reading a PDW data file;
step 2, determining a receiver model according to the type of the simulator, and executing step 3 if the wide-open receiver model is selected; if the channelized receiver model is selected, executing the step 4;
step 3, deleting the PDW of the pulse if the radar pulse is out of the dynamic range of the wide-open receiver; otherwise, the PDW of the pulse is reserved;
in the PDW of the reserved pulse, for PDW with overlapping time, if the amplitude difference is smaller than a set threshold value, the PDW of the pulse which arrives firstly is reserved, and the PDW of the pulse which arrives later is deleted; otherwise, the PDW is completely reserved, and the step 5 is executed;
step 4, if the radar pulse is out of the dynamic range of the channelized receiver, deleting the PDW of the pulse; otherwise, the PDW of the pulse is reserved;
for PDWs with overlapping time, all the PDWs are reserved, and the PDWs are sent out according to the arrival sequence of the pulses;
step 5, generating a counter with an interval of t, setting the initial value of the counter as the arrival time TOA of the first PDW, and outputting the PDW;
reading the next PDW, and if the arrival time TOA of the PDW is less than or equal to the count value of the current counter, outputting the PDW; if the TOA of the PDW is larger than the count value of the counter, the PDW is output until the TOA of the PDW is equal to the count value of the counter.
2. The method of claim 1, wherein the PDW data file comprises a PDW sequence of radar pulses.
3. The pulse timing recovery method of a radar signal simulator according to claim 1, wherein the set threshold value is 6db.
4. The pulse timing recovery method for a radar signal simulator of claim 1, wherein t is equal to an accuracy of the arrival time TOA of PDW.
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