Real-time selection method for optimal tracking repetition frequency of artillery reconnaissance and calibration radar

Abstract

The present invention relates to a real-time selection method for the optimal tracking repetition frequency of a gun position reconnaissance and calibration radar, and belongs to the field of radar technology. Within a given repetition frequency range, if the filter number of the target under a certain repetition frequency can be the central filter number, it can be selected; if not, an optimal one can also be selected. The computational complexity of the method of the present invention is independent of the size of the repetition frequency range, and is particularly suitable for use in real-time beam scheduling algorithms with tight time resources. This technology can be applied to phased array gun position reconnaissance and calibration radars operating in various TAS modes, and has very broad application prospects.

Description

Technical Field

[0001] The present invention belongs to the two technical fields of radar and computer, and relates to the tracking beam repetition frequency selection of the artillery position reconnaissance and calibration radar, so that when the artillery position reconnaissance and calibration radar tracks the target, the filter number of the target is at the center of the filter of the tracking repetition frequency, ensuring that the target is not disturbed by the external meteorological, electromagnetic and other environments, and can be tracked stably. The technology can be applied to the fields of phased array electronic scanning radar, and is particularly suitable for artillery position reconnaissance and calibration radar working in TAS mode. Background Art

[0002] Phased array gun position reconnaissance and calibration radars generally operate in TAS mode, establishing a search screen in the designated working area. When a projectile target passes through the search screen, it is tracked after confirmation. During the tracking process, the best tracking repetition frequency is selected based on the Doppler velocity of the target, so that the filter number of the target falls into the filter clean area, and the closer the filter number of the target at this repetition frequency is to the center of the filter, the better. Generally, several repetition frequencies are used as alternative repetition frequencies, and the best tracking repetition frequency is obtained by traversing the alternative repetition frequencies.

[0003] Since the Doppler velocity span of the target is very large, some radar models even require a span from 7m / s to 1000m / s, nearly 150 times. The filter clean area will also become smaller due to meteorological factors and other factors. The limited number of alternative repetition frequencies cannot guarantee that the target will fall in the clean area under the selected repetition frequency. This makes it easy for the target to be lost during the tracking process, or the tracking quality deteriorates, affecting the subsequent tracking and data processing accuracy.

[0004] Increasing the number of candidate repetition frequencies will increase the calculation time, which is obviously not a desirable solution in the artillery reconnaissance and calibration radar where time resources are limited. Moreover, the candidate repetition frequencies cannot be increased arbitrarily, but need simulation calculation. With each increase in the candidate repetition frequency, the amount of simulation calculation will increase exponentially, which is not suitable for radar debugging and parameter adjustment. Therefore, it is necessary to find a permanent method to free the selection of the optimal tracking repetition frequency from the design of the radar. Summary of the invention

[0005] Technical issues to be solved

[0006] In order to solve the problem that when selecting the tracking repetition rate for the artillery position reconnaissance and calibration radar, the target's filter cannot all fall into the clean area, resulting in tracking loss or quality degradation, the present invention provides a real-time selection method for the optimal tracking repetition rate for the artillery position reconnaissance and calibration radar.

[0007] Technical Solution

[0008] A real-time selection method for the optimal tracking repetition frequency of a gun position reconnaissance and calibration radar, characterized by the following steps:

[0009] Step 1: Assume the given repetition frequency range is [prf min ,prf max ], then the corresponding repetition period range Rewrite it as [pri min ,pri max ], the Doppler frequency of the tracked target is Let function

[0010]

[0011] Step 2: Set [pri min ,pri max ] into formula 2, we get [g min , g max ],in:

[0012]

[0013] In the formula, Z0, Z1 are the integer part, R0, R1 are the decimal part;

[0014] If we can find an integer Z p , satisfying Z p ≥Z0 and g min ≤(Z p +0.5)≤g max If the conditions are met, then it will be possible to min ,prf max ] range to select the target Doppler frequency that falls within the center filter repetition frequency prf opt :

[0015]

[0016] Obviously, Z p May not exist or have more than one value;

[0017] Step 3: When Z p When it does not exist, if |R0-0.5|≤|R1-0.5|, prf opt =prf max On the contrary, prf opt =prf min ;

[0018] When Z p If you want to use a high repetition rate to obtain a short beam dwell time and a large clean area, select Z p Substitute the smallest of the two into Formula 4; if you want to use a low repetition rate to achieve better Doppler measurement accuracy, select Z p Substitute the largest one into formula 4, and the specific selection strategy is selected according to the radar conditions.

[0019] A computer system, characterized in that it comprises: one or more processors, and a computer-readable storage medium for storing one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors implement the above-mentioned method.

[0020] A computer-readable storage medium, characterized in that it stores computer-executable instructions, which are used to implement the above method when executed.

[0021] Beneficial Effects

[0022] The present invention provides a real-time selection method for the optimal tracking repetition frequency of a gun position reconnaissance and calibration radar, which is a method for fast and real-time optimal repetition frequency selection. Within a given repetition frequency range, during the tracking process, if the filter number of the target at a certain repetition frequency can be the central filter number, it can definitely be selected; if not, an optimal one can also be selected, and the algorithm calculation amount is independent of the size of the repetition frequency range, and is smaller than the calculation amount of the alternative repetition frequency scheme, and is particularly suitable for application in real-time beam scheduling algorithms with tight time resources.

[0023] This technology is original and innovative, and can be applied to phased array gun reconnaissance and calibration radars operating in various TAS modes, and has very broad application prospects. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0025] The specific embodiments of the present invention are described in detail as follows:

[0026] If the Doppler frequency of the target being tracked is The tracking repetition frequency is prf, and the corresponding repetition period is pri, then:

[0027]

[0028] Where Z is the integer part and R is the decimal part. If R = 0.5, prf is the optimal repetition rate of the target.

[0029] On this basis, let the given repetition frequency range be [prf min ,prf max ], then the corresponding repetition period range Rewrite it as [pri min ,pri max], the Doppler frequency of the tracked target is Let function

[0030]

[0031] It can be seen that g is a linear function of pri. min ,pri max ] into formula 2, we get [g min , g max ],in:

[0032]

[0033] In the formula, Z0, Z1 are the integer part, R0, R1 are the decimal part. If we can find an integer Z p , satisfying Z p ≥Z0 and g min ≤(Z p +0.5)≤g max If the conditions are met, then it will be possible to min ,prf max ] range to select the target Doppler frequency that falls within the center filter repetition frequency prf opt :

[0034]

[0035] Obviously, Z p May not exist or may have more than one value.

[0036] When Z p When it does not exist, if |R0-0.5|≤|R1-0.5|, prf opt =prf max On the contrary, prf opt =prf min .

[0037] When Z p If you want to use a high repetition rate to obtain a short beam dwell time and a large clean area, select Z p Substitute the smallest of the two into Formula 4; if you want to use a low repetition rate to achieve better Doppler measurement accuracy, select Z p Substitute the largest one into formula 4, and the specific selection strategy is selected according to the radar conditions.

[0038] Obviously, given the Doppler velocity range of the detected target, the algorithm also has a certain guiding significance for selecting the repetition frequency range, and the present invention is unified in design and implementation.

[0039] In order to enable those skilled in the art to better understand the present invention, the present invention is described in detail below in conjunction with specific embodiments.

[0040] Embodiment 1:

[0041] Assume that the given repetition period range is [268, 396] μs, that is, [268×10 -6 ,396×10 -6 ]s.

[0042] a) There is Z p The situation

[0043] If the target's Doppler frequency According to formula 2, we can get:

[0044]

[0045] At this time, g min =13.4, g ma =19.8, Z0=13, R0=0.4, Z1=19, R1=0.8.

[0046] Obviously, any number Z in the set {13, 14, 15, 16, 17, 18, 19} p , both satisfy Z p ≥Z0=13, and 13.4≤(Z p +0.5)≤19.8.

[0047] 1) If you want to use high repetition rate to obtain short beam dwell time and large clean area, let Z p =13, and put it into formula 4 to get the optimal repetition frequency:

[0048]

[0049] The optimal repetition period at this time is:

[0050]

[0051] 2) If you want to use a low repetition rate to achieve better Doppler measurement accuracy, let Z p =19, and put it into formula 4 to get the optimal repetition frequency:

[0052]

[0053] The optimal repetition period at this time is:

[0054]

[0055] b) Z does not exist p Condition

[0056] If the target's Doppler frequency According to formula 2, we can get:

[0057]

[0058] At this time, g min =0.804, g max =1.188, Z0=0, R0=0.804, Z1=1, R1=0.188. Obviously, there is no Z p , so that Z p ≥Z0, and 0.804≤(Z p +0.5)≤1.188. And because |0.804-0.5|=0.304<|0.188-0.5|=0.312, the optimal repetition period pri is selected opt =268μs.

[0059] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should be included in the protection scope of the present invention.

Claims

1. A real-time selection method for the optimal tracking repetition frequency of a gun position reconnaissance and calibration radar, characterized in that Here are the steps: Step 1: Assume the given repetition frequency range is [prf min ,prf max ], then the corresponding repetition period range Rewrite it as [pri min ,pri max ], the Doppler frequency of the tracked target is Let function Step 2: Set [pri min ,pri max ] into formula 2, we get [g min ,g max ],in: In the formula, Z0, Z1 are the integer part, R0, R1 are the decimal part; If an integer Z is found p , satisfying Z p ≥Z0 and g min ≤(Z p +0.5)≤g max If the conditions are met, then it will be possible to min ,prf max ] range to select the target Doppler frequency to fall within the center filter repetition frequency prf opt : Obviously, Z p There are several cases: no value or more than one value; Step 3: When Z p When it does not exist, if |R0-0.5|≤|R1-0.5|, prf opt =prf max On the contrary, prf opt =prf min ; When Z p If more than one is needed, if a high repetition rate is required to obtain a short beam dwell time and a large clean area, select Z p Substitute the smallest of the two into Formula 4; if a lower repetition rate is required to achieve better Doppler measurement accuracy, select Z p Substitute the largest one into formula 4, and the above two selection strategies are selected according to the radar conditions.

2. A computer system, characterized in that include: One or more processors, and a computer-readable storage medium for storing one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors are enabled to implement the method of claim 1.

3. A computer-readable storage medium, characterized in that Computer executable instructions are stored, and when the instructions are executed, they are used to implement the method of claim 1.

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