Implementation method of improved pitch dimension sequential amplitude comparison angle measurement

Abstract

The invention discloses an improved pitching dimension sequence amplitude comparison angle measurement realization method, and relates to target pitching angle measurement in two-dimensional phased array three-coordinate radar detection, the method designs pitching beams with low, middle and high different working parameters under the condition of not reducing power, and the pitching beams with low, middle and high working parameters are designed under the condition of not changing the height coverage range. Occupation of pitching beam accumulation time is reduced, power is guaranteed by low beams, and pitching coverage is guaranteed by medium and high beams; in the signal processing process, by constructing a pitching wave train and a parameter set and adopting the modes of amplitude balancing, optimal amplitude selection, amplitude comparison angle calculation and the like between wave beams, high-precision angle measurement is achieved under sequential multiple wave beams with different parameters, and calculation errors are reduced. The method does not involve hardware modification, and high-precision pitching dimension angle measurement is simply and quickly completed under the condition of low cost.

Description

Technical Field

[0001] The invention belongs to the technical field of radar height measurement, and in particular relates to an improved method for realizing sequential amplitude ratio angle measurement in pitch dimension. Background Art

[0002] At present, the anti-UAV market often requires radars to have three-coordinate functions, that is, in addition to conventional target information such as distance and speed, it is necessary to provide target altitude information. Due to cost considerations, traditional three-coordinate two-dimensional phased array radars only use single-pulse angle measurement in the azimuth dimension and sequential amplitude ratio angle measurement in the pitch dimension. This brings about problems such as increased accumulation time, reduced data rate, large calculation errors, and poor angle measurement accuracy, and its practicality is poor. Summary of the invention

[0003] The object of the present invention is to provide an improved method for realizing sequential amplitude ratio angle measurement in pitch dimension.

[0004] The technical solution to achieve the purpose of the present invention is: an improved method for realizing sequential ratio angle measurement in pitch dimension, comprising the following steps:

[0005] Step 1: construct one elevation wave train from N elevation beams sequentially scanned in the elevation dimension at the same azimuth wave position, cache the MTD data of all beams in the wave train, perform constant false alarm and target aggregation operations on the MTD data of all beams in the wave train, and obtain the over-threshold target;

[0006] Step 2: Obtain the beam pointing θp, pulse width tp, bandwidth bw, accumulated pulse number prfn, and FPGA truncation compensation a of the target beam. t , and the target's speed v, distance r, amplitude Amp, calculate the normalized amplitude Amp', and construct the parameter set χ=[θp,tp,bw,prfn,a t ,v,r,Amp,Amp'];

[0007] Step 3: According to the speed and distance information of the target, obtain the MTD range gate r1 of the upper and lower adjacent beams corresponding to the target through parameter conversion n 、Speed ​​Gate v1 n Coordinate information, and select the maximum value in the nine-square grid around this coordinate as the matching amplitude of the actual target in the beam projection:

[0008]

[0009] Step 4: After processing in step 3, construct the projection target parameter set x of the upper and lower beams up and χ down ,

[0010] Step 5: After processing in step 4, in the normalized equivalent case, compare the normalized amplitudes of the upper and lower beams. If the upper beam equivalent amplitude is larger than the lower beam equivalent amplitude, it is determined that the target falls between the current beam and the upper beam. If the lower beam equivalent amplitude is larger than the upper beam equivalent amplitude, it is determined that the target falls between the current beam and the lower beam.

[0011] Step 6: After the determination in step 5, if the target falls between the current beam and the upper beam, the angle measurement formula is: If the target falls between the current beam and the next beam, the angle measurement formula is: where k dr It is the angle measurement coefficient calculated from the two-way direction atlas angle curve.

[0012] An electronic device comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned improved method for realizing sequential ratio angle measurement in pitch dimension when executing the program.

[0013] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the above-mentioned improved method for measuring the angle of the pitch-dimension sequence ratio.

[0014] A computer program product comprises a computer program, which, when executed by a processor, implements the above-mentioned improved method for realizing sequential ratio angle measurement in pitch dimension.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) The traditional sequential amplitude ratio angle measurement algorithm is improved by establishing pitch wave trains with different parameters and constructing parameter sets. The algorithm is easy to implement in embedded systems.

[0017] (2) The present invention performs target projection, amplitude balancing, and optimal amplitude selection on beams with different parameters, thereby reducing calculation errors and achieving high angle measurement accuracy;

[0018] (3) The present invention does not need to increase hardware costs, but only makes optimizations at the software level, thereby reducing development costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the sequential multi-beam power coverage diagram in the elevation dimension.

[0020] Figure 2 The present invention is a flow chart of the method for realizing the improved sequential amplitude ratio angle measurement in the pitch dimension. DETAILED DESCRIPTION

[0021] The present invention proposes an improved method for realizing sequential amplitude ratio angle measurement in the elevation dimension, which relates to the pitch angle measurement of targets in two-dimensional phased array three-coordinate radar detection. Compared with the single pulse angle measurement method, sequential amplitude ratio angle measurement has the advantages of simple hardware architecture and low cost, but also has the disadvantages of reduced data rate and poor angle measurement accuracy. Without reducing the power, this method designs three different working parameters of low, medium and high elevation beams. When the height coverage range remains unchanged, the accumulation time of the elevation beam is reduced. The low beam maintains the power, and the medium and high beams maintain the elevation coverage. Figure 1 As shown in the figure, in signal processing, by constructing the pitch wave train and parameter set, the amplitude balancing, optimal amplitude selection, and amplitude angle calculation are adopted between the beams to achieve high-precision angle measurement under sequential multi-beams with different parameters and reduce the calculation error. This method does not involve hardware changes and can simply and quickly complete high-precision pitch angle measurement at a low cost.

[0022] like Figure 2 As shown, an improved method for realizing sequential amplitude ratio angle measurement in pitch dimension comprises the following steps:

[0023] Step 1: construct one elevation wave train from N elevation beams sequentially scanned in the elevation dimension at the same azimuth wave position, cache the MTD data of all beams in the wave train, perform constant false alarm and target aggregation operations on the MTD data of all beams in the wave train, and obtain the over-threshold target;

[0024] Step 2: Obtain the beam pointing θp, pulse width tp, bandwidth bw, accumulated pulse number prfn, and FPGA truncation compensation a of the target beam. t , and the target's speed v, distance r, amplitude Amp and other information, according to the amplitude balancing formula Calculate the normalized amplitude Amp' and construct the parameter set χ=[θp,tp,bw,prfn,a t ,v,r,Amp,Amp'].

[0025] Among them, the pulse width tp needs to take into account the half pulse pressure situation, that is, the full pulse pressure only needs to enter the pulse width value, and the half pulse pressure needs to calculate the actual pulse width of the pulse pressure based on the actual target distance. Where R target is the actual distance to the target, R ba is the blind spot distance.

[0026] Step 3: According to the speed and distance information of the target, obtain the upper and lower adjacent beams corresponding to the target through parameter conversion (if there is no upper and lower beam, only select one side) MTD range gate Speed ​​Gate Coordinate information, where r0 / v0 are the distance and speed of the current beam target, dr1 / dv1 are the distance and speed calculation units of the projection beam, and in the nine-square grid around this coordinate (as shown in the following formula), the maximum value is selected as the matching amplitude of the actual target in the beam projection.

[0027]

[0028] Step 4: After processing in step 3, construct the projection target parameter set x of the upper and lower beams up and χ down ,

[0029]

[0030] Step 5. After processing in step 4, compare the normalized amplitudes of the upper and lower beams in the normalized equivalent condition. If the upper beam equivalent amplitude is larger than the lower beam equivalent amplitude, it can be determined that the target falls between the current beam and the upper beam. If the lower beam equivalent amplitude is larger than the upper beam equivalent amplitude, it can be determined that the target falls between the current beam and the lower beam.

[0031] Step 6: After the determination in step 5, if the target falls between the current beam and the upper beam, the angle measurement formula is: If the target falls between the current beam and the next beam, the angle measurement formula is: where k dr It is the angle measurement coefficient calculated from the two-way direction atlas angle curve.

[0032] Step 7: Through the above steps, the accurate pitch angle value of the target is calculated.

[0033] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0034] Example

[0035] An improved method for realizing sequential amplitude ratio angle measurement in pitch dimension, in the process of radar measuring the pitch angle of a target, such as Figure 2 As shown, the following steps are included:

[0036] Step 1: Scan the five elevation beams in the same azimuth wave position in the elevation dimension in sequence, and adjust the beam pointing θp, pulse width tp, bandwidth bw, accumulated pulse number prfn, and FPGA truncation compensation a of each beam. t Construct the beam parameter set, χ 0 =[4°,50us,6Mhz,512,4],χ 1 =[9°,50us,6Mhz,256,2],χ 2 =]17°,30us,6Mhz,256,2],χ 3=[22°,20us,6Mhz,128,1],χ 4 = [30°, 15us, 6Mhz, 128, 1], construct it into a pitch wave train, cache the MTD data of all beams in the wave train, perform constant false alarm and target aggregation operations on the MTD data of all beams in the wave train, and obtain the over-threshold target TargetInfo;

[0037] Step 2: Obtain the target's speed v, distance r, amplitude Amp and other information, and use the amplitude balancing formula Calculate the normalized amplitude Amp' and construct the target parameter set χ = ​​[θp, tp, bw, prfn, a t ,v,r,Amp,Amp'].

[0038] Among them, the pulse width tp needs to take into account the half pulse pressure situation, that is, the full pulse pressure only needs to enter the pulse width value, and the half pulse pressure needs to calculate the actual pulse width of the pulse pressure based on the actual target distance. Where R target is the actual distance to the target, R ba is the blind spot distance.

[0039] Step 3: According to the speed and distance information of the target, the target projection of the upper and lower adjacent beams corresponding to the target is obtained through parameter conversion. Due to inconsistent beam parameters, the range gate / speed gate of the projected target needs to be rounded, and then the maximum amplitude is searched in the nine-square grid around the coordinate as the optimal amplitude selection.

[0040]

[0041] Step 4: After processing in step 3, calculate the normalized amplitude Amp' according to the parameter set of the projection beam. up and Amp' down , construct the projection target parameter set χ of the upper and lower beams up and χ down ,

[0042] Step 5. After processing in step 4, compare the normalized amplitudes of the upper and lower beams in the normalized equivalent condition. If the upper beam equivalent amplitude is larger than the lower beam equivalent amplitude, it can be determined that the target falls between the current beam and the upper beam. If the lower beam equivalent amplitude is larger than the upper beam equivalent amplitude, it can be determined that the target falls between the current beam and the lower beam.

[0043] Step 6: After the determination in step 5, if the target falls between the current beam and the upper beam, the angle measurement formula is: If the target falls between the current beam and the next beam, the angle measurement formula is: where kdr It is the angle measurement coefficient calculated from the two-way direction atlas angle curve.

[0044] Step 7: Through the above steps, the accurate pitch angle value of the target is calculated.

[0045] This method is also applicable to the situation where the detection amplitude of multi-beam targets with different parameters is inconsistent due to the addition of complex waveform designs such as STC and wide-narrow pulse combination. Compensation and normalization can be performed respectively to achieve amplitude balancing and effectively reduce calculation errors.

Claims

1. An improved method for realizing sequential amplitude ratio angle measurement in pitch dimension, characterized in that: The following steps are involved: Step 1: construct one elevation wave train from N elevation beams sequentially scanned in the elevation dimension at the same azimuth wave position, cache the MTD data of all beams in the wave train, perform constant false alarm and target aggregation operations on the MTD data of all beams in the wave train, and obtain the over-threshold target; Step 2: Obtain the beam pointing θp, pulse width tp, bandwidth bw, accumulated pulse number prfn, and FPGA truncation compensation a of the target beam. t , and the target's speed v, distance r, amplitude Amp, calculate the normalized amplitude Amp', and construct the parameter set χ=[θp,tp,bw,prfn,at,v,r,Amp,Amp'] with the above parameters; Step 3: According to the speed and distance information of the target, obtain the MTD range gate r1 of the upper and lower adjacent beams corresponding to the target through parameter conversion n 、Speed ​​Gate v1 n Coordinate information, and select the maximum value in the nine-square grid around this coordinate as the matching amplitude of the actual target in the beam projection: Step 4: After processing in step 3, construct the projection target parameter set x of the upper and lower beams up and χ down , Step 5: After processing in step 4, in the normalized equivalent case, compare the normalized amplitudes of the upper and lower beams. If the upper beam equivalent amplitude is larger than the lower beam equivalent amplitude, it is determined that the target falls between the current beam and the upper beam. If the lower beam equivalent amplitude is larger than the upper beam equivalent amplitude, it is determined that the target falls between the current beam and the lower beam. Step 6: After the determination in step 5, if the target falls between the current beam and the upper beam, the angle measurement formula is: If the target falls between the current beam and the next beam, the angle measurement formula is: where k dr It is the angle measurement coefficient calculated from the two-way direction atlas angle curve.

2. The improved method for realizing sequential ratio angle measurement in pitch dimension according to claim 1 is characterized in that: According to the amplitude balancing formula Calculate the normalized amplitude Amp'.

3. The improved method for realizing sequential ratio angle measurement in pitch dimension according to claim 2 is characterized in that: The pulse width tp needs to take into account the half pulse pressure situation, that is, the full pulse pressure only needs to enter the pulse width value, and the half pulse pressure needs to calculate the actual pulse width of the pulse pressure based on the actual target distance Where R target is the actual distance to the target, R ba is the blind spot distance.

4. The improved method for realizing sequential ratio angle measurement in pitch dimension according to claim 1 is characterized in that: In step 3, obtain the MTD range gate r1 of the upper and lower adjacent beams corresponding to the target n 、Speed ​​Gate v1 n Coordinate information, Where r0 and v0 are the distance and speed of the current beam target respectively, and dr1 and dv1 are the distance and speed calculation units of the projection beam respectively.

5. The improved method for realizing sequential ratio angle measurement in pitch dimension according to claim 4 is characterized in that: For the upper and lower adjacent beams corresponding to the target, if there are no upper and lower beams, only the existing side is selected.

6. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps of the method according to any one of claims 1 to 5 are implemented.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

8. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

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