Improved implementation of pitch order range finder

Abstract

The application discloses an improved implementation method of pitch-beam amplitude-ratio angle measurement, relates to the measurement of the pitch angle of a target in two-dimensional phased array three-coordinate radar detection, and does not reduce the power in the method, wherein low, medium and high three different working parameter pitch beams are designed, the occupation of the accumulation time of the pitch beams is reduced under the condition that the height coverage range is unchanged, the low beam preserves the power, and the medium and high beams preserve the pitch coverage; in signal processing, the pitch beam column and the parameter set are constructed, the amplitude trimming, the optimal amplitude selection, the amplitude-ratio angle calculation and the like are adopted between the beams, high-precision angle measurement is realized under the sequence multi-beam of different parameters, and the calculation error is reduced. The method does not involve hardware change, and high-precision pitch dimension angle measurement is simply and quickly completed under the condition of low cost.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of radar height measurement, and particularly relates to an improved implementation method of pitch dimension order amplitude comparison angle measurement. BACKGROUND

[0002] Currently, the anti-UAV market often requires radars to have three-coordinate functions, that is, in addition to the conventional target information such as distance and speed, the height information of the target needs to be provided. The traditional three-coordinate two-dimensional phased array radar adopts single-pulse angle measurement in the azimuth dimension and order amplitude comparison angle measurement in the pitch dimension for cost consideration, which brings problems such as increased accumulation time, reduced data rate, large calculation error, poor angle measurement precision, and poor practicability. SUMMARY

[0003] The application aims to provide an improved implementation method of pitch dimension order amplitude comparison angle measurement.

[0004] The technical solution for achieving the application is as follows: an improved implementation method of pitch dimension order amplitude comparison angle measurement, comprising the following steps:

[0005] Step 1: N pitch beams scanned in sequence in the pitch dimension under the same azimuth wave position are constructed into one pitch wave column, the MTD data of all the beams in the wave column are cached, the MTD data of all the beams in the wave column are subjected to constant false alarm and target condensation operation, and the over-threshold target is obtained.

[0006] Step 2: the beam pointing θp, the pulse width tp, the bandwidth bw, the accumulation pulse number prfn, the FPGA truncation compensation a t of the beam where the target is located, and the speed v, the distance r, and the amplitude Amp of the target are obtained, the normalized amplitude Amp' is calculated, and the above parameters are constructed into a 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, the corresponding upper and lower adjacent beam MTD distance gate r1 n , speed gate v1 n coordinate information of the target are obtained through parameter conversion, and the maximum value in the nine-square grid around the coordinate is selected as the matching amplitude of the actual target in the projection of the beam:

[0008]

[0009] Step 4: after the processing in Step 3, the projection target parameter set χ up and χ down ,

[0010] Step 5, after the processing of step 4, the normalized equivalent case, the normalized amplitude of the upper and lower beams is compared, if the equivalent amplitude of the upper beam is greater than the equivalent amplitude of the lower beam, it is determined that the target is between the current beam and the upper beam, if the equivalent amplitude of the lower beam is greater than the equivalent amplitude of the upper beam, it is determined that the target is between the current beam and the lower beam;

[0011] Step 6, after the processing of step 5, if the target is between the current beam and the upper beam, the angle measurement formula is If the target is between the current beam and the lower beam, the angle measurement formula is Where k dr Is the angle measurement coefficient calculated by the two-way directional diagram angle calibration curve.

[0012] An electronic device, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the program to realize the improved implementation method of the elevation dimension order amplitude comparison angle measurement.

[0013] A computer readable storage medium, having a computer program stored thereon, wherein the program is executed by a processor to realize the improved implementation method of the elevation dimension order amplitude comparison angle measurement.

[0014] A computer program product, comprising a computer program, wherein the computer program is executed by a processor to realize the improved implementation method of the elevation dimension order amplitude comparison angle measurement.

[0015] Compared with the prior art, the beneficial effects of the present application are:

[0016] (1) The traditional order amplitude comparison angle measurement algorithm is improved by establishing different parameter elevation wave trains and constructing parameter sets, and the algorithm is easy to embed;

[0017] (2) The present application projects the target on different parameter beams, levels the amplitude, and selects the optimal amplitude, which reduces the calculation error and improves the angle measurement accuracy.

[0018] (3) The present application does not need to increase the hardware cost, only optimizes in the software level, and reduces the development cost. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The power coverage diagram of the elevation dimension order multi-beam.

[0020] Figure 2 The flow chart of the improved implementation method of the elevation dimension order amplitude comparison angle measurement. DETAILED DESCRIPTION

[0021] The application provides an improved implementation method of pitch dimension order amplitude comparison angle measurement, and relates to the pitch angle measurement of a target in two-dimensional phased array three-coordinate radar detection. Compared with the single pulse angle measurement mode, the order amplitude comparison 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 precision. The method does not reduce the power, designs low, medium and high three different working parameter pitch beams, reduces the occupation of the pitch beam accumulation time under the condition of unchanged height coverage range, keeps the power of the low beam, and keeps the pitch coverage of the medium and high beams, such as shown in the figure. Figure 1 In the signal processing, the pitch column and the parameter set are constructed, the amplitude trimming, the optimal amplitude selection, the amplitude comparison angle calculation and other modes are used between the beams, the high-precision angle measurement is realized under the order multi-beam of different parameters, and the calculation error is reduced. The method does not involve hardware modification, and the high-precision pitch dimension angle measurement is simply and quickly completed under the condition of low cost.

[0022] As shown in the figure, Figure 2 An improved implementation method of pitch dimension order amplitude comparison angle measurement comprises the following steps:

[0023] Step 1: N pitch beams scanned in pitch dimension order under the same azimuth wave position are constructed into one pitch column, the MTD data of all the beams in the column are cached, the constant false alarm and target condensation operation are performed on the MTD data of all the beams in the column, and the over-threshold target is obtained.

[0024] Step 2: the beam pointing θp, the pulse width tp, the bandwidth bw, the accumulation pulse number prfn, the FPGA truncation compensation a t , the speed v, the distance r, the amplitude Amp and other information of the target of the target are obtained, the normalized amplitude Amp' is calculated according to the amplitude trimming formula , and the above parameters are constructed into a parameter set χ=[θp,tp,bw,prfn,a t ,v,r,Amp,Amp'].

[0025] Among them, the pulse width tp needs to consider the half pulse compression, that is, the full pulse compression only needs to bring the pulse width value, and the half pulse compression needs to calculate the pulse width actually participating in the pulse compression according to the actual target distance target R ba is the actual distance of the target, and R

[0026] Step 3: according to the speed and distance information of the target, the MTD distance gate speed gate Coordinate information, wherein r0 / v0 are the distance and speed of the current beam target respectively, dr1 / dv1 are the distance and speed of the projected beam, and the maximum value in the nine-square grid around the coordinate (as shown in the following formula) is selected as the matching amplitude of the actual target in the beam projection.

[0027]

[0028] Step 4, after the processing in step 3, the projection target parameter set χ of the upper and lower beams is constructed up and χ down ,

[0029]

[0030] Step 5, after the processing in step 4, the normalized amplitudes of the upper and lower beams are compared under the equivalent condition, if the equivalent amplitude of the upper beam is greater than that of the lower beam, it can be determined that the target is between the current beam and the upper beam, and if the equivalent amplitude of the lower beam is greater than that of the upper beam, it can be determined that the target is between the current beam and the lower beam.

[0031] Step 6, after the processing in step 5, if the target is between the current beam and the upper beam, the angle measurement formula is If the target is between the current beam and the lower beam, the angle measurement formula is Wherein k dr is the angle measurement coefficient calculated by the two-way directional diagram angle calibration curve.

[0032] Step 7, through the above steps, the accurate elevation angle value of the target is calculated.

[0033] The application will be described in detail below in combination with the drawings and examples.

[0034] Example

[0035] An improved implementation method of elevation angle measurement by order amplitude comparison, in the process of radar elevation angle measurement on a target, as shown in the figure, the method comprises the following steps: Figure 2

[0036] Step 1, five elevation beams scanned in sequence in the same azimuth beam position are selected, the beam direction θp, the pulse width tp, the bandwidth bw, the accumulation pulse number prfn, and the FPGA truncation compensation a t ​A beam parameter set is constructed, χ0=[4°,50us,6Mhz,512,4], χ1=[9°,50us,6Mhz,256,2], χ2=[17°,30us,6Mhz,256,2], χ3=[22°,20us,6Mhz,128,1], χ4=[30°,15us,6Mhz,128,1], which is then used to construct an elevation beam train. The MTD data of all beams in the beam train is cached, and constant false alarm rate and target aggregation calculations are performed on the MTD data of all beams in the beam train to obtain the targetInfo of the target that has passed the threshold.

[0037] Step 2: Obtain information such as the target's velocity v, distance r, and amplitude Amp, and then apply the amplitude balancing formula. Calculate the normalized amplitude Amp', and construct the target parameter set χ=[θp,tp,bw,prfn,a] on the beam parameter set. t ,v,r,Amp,Amp').

[0038] Among these, the pulse width tp needs to take into account the half-pulse pressure case. That is, for the full pulse pressure, only the pulse width value needs to be substituted, while for the half-pulse pressure, the actual pulse width involved in the pulse pressure needs to be calculated based on the actual target distance. Where R target R is the actual distance to the target. ba This refers to the blind spot distance.

[0039] Step 3: Based on the target's velocity and distance information, obtain the target projection of the corresponding upper and lower adjacent beams through parameter conversion. Since the beam parameters are inconsistent, it is necessary to round the distance / velocity gate of the projected target, and then search for the maximum amplitude value within the nine-square grid around the coordinates as the optimal amplitude selection.

[0040]

[0041] Step 4: Following the processing in Step 3, calculate the normalized amplitude Amp' based on the parameter set of the projected 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, under the normalized equivalent condition, compare the normalized amplitudes of the upper and lower beams. If the equivalent amplitude of the upper beam is larger than that of the lower beam, then it can be determined that the target falls between the current beam and the upper beam. If the equivalent amplitude of the lower beam is larger than that of the upper beam, then it can be determined that the target falls between the current beam and the lower beam.

[0043] Step 6, if the target falls between the current beam and the upper beam after the step 5 judgment processing, then the angle measurement formula is If the target falls between the current beam and the lower beam, then the angle measurement formula is Where k dr is the angle measurement coefficient calculated by the two-way directional diagram angle calibration 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 case that the different parameter multi-beam target detection amplitudes are inconsistent after the complex waveform design such as increasing STC and wide-narrow pulse combination, and can be compensated and normalized respectively to realize amplitude matching and effectively reduce the calculation error.

Claims

1. An improved method for implementing pitch-dimensional sequential amplitude angle measurement, characterized in that, Includes the following steps: Step 1: Construct N elevation beams that are sequentially scanned in the same azimuth position into one elevation beam train, cache the MTD data of all beams in the beam train, and perform constant false alarm rate and target aggregation calculations on the MTD data of all beams in the beam train to obtain targets that pass the threshold. Step 2: Obtain the beam pointing θp, pulse width tp, bandwidth bw, accumulated pulse count prfn, and FPGA truncation compensation a of the target beam. t Given the target's velocity v, distance r, and amplitude Amp, calculate the normalized amplitude Amp', and construct a parameter set χ = ​​[θp, tp, bw, prfn, a t ,v,r,Amp,Amp']; Step 3: Based on the target's velocity and distance information, obtain the MTD range gate r1 corresponding to the target's upper and lower adjacent beams through parameter conversion. n Speedgate v1 n The coordinate information is used, and the maximum value in the nine-square grid around these coordinates is selected as the matching amplitude of the actual target's projection onto the beam. Step 4: Following the processing in Step 3, construct the projection target parameter set χ for the upper and lower beams. up and χ down , Step 5: After processing in step 4, under the normalized equivalent condition, compare the normalized amplitudes of the upper and lower beams. If the equivalent amplitude of the upper beam is larger than that of the lower beam, then the target is determined to fall between the current beam and the upper beam. If the equivalent amplitude of the lower beam is larger than that of the upper beam, then the target is determined to fall between the current beam and the lower beam. Step 6: After the judgment and processing in Step 5, if the target falls between the current beam and the upper beam, then the angle measurement formula is: If the target falls between the current beam and the next beam, then the angle measurement formula is: Where k dr The angle coefficients are calculated from the angle curves of the two-way direction chart.

2. The improved method for implementing pitch-dimensional sequential amplitude angle measurement according to claim 1, characterized in that, According to the amplitude balancing formula Calculate the normalized magnitude Amp'.

3. The improved method for implementing pitch-dimensional sequential amplitude angle measurement according to claim 2, characterized in that, The pulse width (tp) needs to consider the half-pulse pressure case. That is, for the full pulse pressure, only the pulse width value needs to be input, while for the half-pulse pressure, the actual pulse width involved in the pulse pressure needs to be calculated based on the actual target distance. Where R target R is the actual distance to the target. ba This refers to the blind spot distance.

4. The improved method for implementing pitch-dimensional sequential amplitude angle measurement according to claim 1, characterized in that, In step 3, the MTD range gate r1 corresponding to the upper and lower adjacent beams of the target is obtained. n Speedgate v1 n Coordinate information Where r0 and v0 are the distance and velocity of the current beam target, respectively, and dr1 and dv1 are the distance and velocity calculation units of the projected beam, respectively.

5. The improved method for implementing pitch-dimensional sequential amplitude angle measurement according to claim 4, characterized in that, For the target, if there are no upper or lower adjacent beams, only the side that has them will be 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, it implements the steps of the method as described in any one of claims 1-5.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps of the method as described in any one of claims 1-5.

8. A computer program product, comprising a computer program, characterized in that, When executed by a processor, the computer program implements the steps of the method described in any one of claims 1-5.

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