Single station positioning method, device and system suitable for passive reconnaissance system

Abstract

The invention discloses a single-station positioning method, device and system suitable for a passive reconnaissance system, and belongs to the field of electronic countermeasure reconnaissance, and the method comprises the steps: firstly, measuring and calculating the signal power of a radiation source reaching an antenna aperture of the single-station reconnaissance system; then, according to an electromagnetic wave propagation principle, a radiation source target propagation distance is reversely calculated; and finally, the radar position is calculated according to the radar radiation source orientation. According to the method, relative movement between the reconnaissance station and the radiation source is not required, the phase difference between multiple receiving channels of the reconnaissance station is not required to be measured, solving is performed based on the closed analytical expression, the positioning speed is high, and engineering implementation is easy.

Description

Technical Field

[0001] The present invention relates to the field of electronic countermeasure reconnaissance, and more specifically, to a single-station positioning method, device and system suitable for a passive reconnaissance system. Background Art

[0002] Currently, the common methods applicable to passive reconnaissance and positioning systems are divided into multi-station positioning and single-station positioning.

[0003] Multi-station positioning requires the coordination of multiple reconnaissance stations. Each reconnaissance station receives the signal of the radiation source target separately, and cross-positioning is achieved through direction finding by two reconnaissance stations, or time difference positioning is achieved by measuring the arrival time of the received signal by three reconnaissance stations.

[0004] Single-station positioning does not rely on the coordination of other reconnaissance stations. Common single-station positioning technologies require relative motion between the reconnaissance station and the radiation source target. Common methods include single-station positioning based on tangential motion ranging and radial motion ranging. A typical representative of the former is single-station positioning based on the interferometer phase difference change rate. The latter requires measuring the direction of the incoming wave, the relative radial acceleration between the target and the reconnaissance station, and calculating the radial distance between the reconnaissance station and the target based on the radial acceleration and the tangential velocity of the platform movement to achieve single-station positioning. Another single-station positioning technology uses a distributed array phase difference positioning system. Each distributed positioning receiving channel synchronously receives the radiation source target signal and forms a phase difference. The best match of the above phase difference is found by searching the possible spatial position of the target, thereby achieving single-station positioning.

[0005] In the prior art, there is relative motion between the reconnaissance station and the radiation source, which requires measuring the phase difference between multiple receiving channels of the reconnaissance station. This results in slow positioning speed and difficult engineering implementation. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a single-station positioning method, device and system suitable for a passive reconnaissance system, which can achieve the goal of not requiring relative motion between the reconnaissance station and the radiation source, and not requiring measurement of the phase difference between multiple receiving channels of the reconnaissance station. It is based on solving closed analytical expressions, has a fast positioning speed, and is easy to implement in engineering.

[0007] The object of the present invention is achieved through the following solutions:

[0008] A single-station positioning method applicable to a passive reconnaissance system comprises:

[0009] By measuring the signal power at the receiving aperture and the azimuth information of the radiation source, single-station rapid positioning can be achieved in combination with radar prior information.

[0010] Furthermore, the method of measuring the receiving port signal power and the radiation source azimuth information and combining the radar prior information to realize single-station rapid positioning specifically includes the following sub-steps:

[0011] First, the signal power from the radiation source to the antenna aperture of the single-station reconnaissance system is measured;

[0012] Then, based on the principle of electromagnetic wave propagation, the propagation distance of the radiation source and target is calculated in reverse;

[0013] Finally, the radar position is calculated based on the direction of the radar radiation source.

[0014] Furthermore, the step of measuring the signal power of the radiation source reaching the antenna aperture of the single-station reconnaissance system specifically includes the following sub-steps:

[0015] The signal power of the radar signal propagating through the atmosphere and reaching the antenna aperture of the single-station reconnaissance system is:

[0016]

[0017] Where f is the frequency of the radiation source target, P T is the emission power of the radiation source target, G T is the antenna power of the radiation source target, R is the propagation distance of the radiation source target, λ is the wavelength of the radiation source target and

[0018] λ=c / f (2)

[0019] c is the speed of light, and f is the target frequency of the radiation source.

[0020] Furthermore, the reverse calculation of the radiation source target distance based on the electromagnetic wave propagation principle specifically includes the following sub-steps:

[0021] The frequency f of the radiation source target is obtained by measurement, and the transmission power P T , transmitting antenna power G T Through the acquisition of prior intelligence, the radiation source target propagation distance R is calculated according to the following inverse formula:

[0022]

[0023] Furthermore, the radiation source target propagation distance comprises the sub-steps of:

[0024] For a single-station passive reconnaissance system, the radar radiation source azimuth θ is obtained by measurement, and the radar position is calculated based on this. The calculation formula is:

[0025]

[0026] Among them, x is the horizontal coordinate of the radar relative to the single-station reconnaissance system, and y is the vertical coordinate of the radar relative to the single-station reconnaissance system.2 +y 2 =R 2 .

[0027] A single-station positioning device suitable for a passive reconnaissance system comprises: a processor and a memory, wherein a computer program is stored in the memory, and when the computer program is loaded by the processor, any of the above methods is executed.

[0028] A single-station positioning system applicable to a passive reconnaissance system comprises the single-station positioning device applicable to a passive reconnaissance system as described above.

[0029] The beneficial effects of the present invention include:

[0030] Compared with the prior art, the present invention proposes a method for realizing single-station rapid positioning by measuring the receiving aperture signal power and the radiation source azimuth information and combining radar prior information. The simulation example shows that the positioning error of this method is positively correlated with the distance. When the distance is short, the positioning error is small and the positioning accuracy is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0032] Figure 1 This is a schematic diagram of single-station positioning;

[0033] Figure 2 4 is a positioning error distribution diagram in an embodiment of the present invention. DETAILED DESCRIPTION

[0034] All features disclosed in all embodiments in this specification, or steps in all methods or processes implicitly disclosed, except for mutually exclusive features and / or steps, can be combined and / or expanded or replaced in any manner.

[0035] The implementation process of the method in the embodiment of the present invention is as follows:

[0036] In a preferred embodiment, a single-station positioning method suitable for a passive reconnaissance system is provided, and a closed analytical expression suitable for engineering implementation is specifically derived, which can realize single-station rapid positioning.

[0037] Usually, a single-station passive reconnaissance system can obtain the radiation source target azimuth θ, signal frequency f and amplitude A. According to the signal amplitude A, the signal power P of the radiation source reaching the antenna aperture of the single-station reconnaissance system can be calculated in combination with the signal processing method. Then, according to the principle of electromagnetic wave propagation, the radiation source target distance R can be inferred.

[0038] Generally speaking, the signal power of the radar signal propagating through the atmosphere and reaching the antenna aperture of a single-station reconnaissance system is:

[0039]

[0040] Where f is the frequency of the radiation source target, P T is the emission power of the radiation source target, G T is the antenna power of the radiation source target, R is the propagation distance of the radiation source target, λ is the wavelength of the radiation source target and

[0041] λ=c / f (2)

[0042] c is the speed of light, and f is the target frequency of the radiation source.

[0043] In fact, the radar signal frequency f can be measured, and the transmission power P T , transmitting antenna power G T It can be obtained through prior intelligence. Based on this, the inverse formula for the radar target distance R within the line of sight is:

[0044]

[0045] For a single-station passive reconnaissance system, the radar radiation source azimuth θ can be measured, and the radar position can be measured. The calculation formula is:

[0046]

[0047] Among them, x is the horizontal coordinate of the radar relative to the single-station reconnaissance system, and y is the vertical coordinate of the radar relative to the single-station reconnaissance system. 2 +y 2 =R 2 ,like Figure 1 shown.

[0048] In addition, according to the signal processing cycle of 100ms, theoretically, the results can be output ten times per second. Therefore, single-station positioning can output the location of the radiation source in seconds, thereby achieving rapid positioning.

[0049] In order to verify the effectiveness of the method of the present invention, a signal processing simulation case of a single-station positioning method suitable for a passive reconnaissance system was designed to verify the correctness of the method of the present invention.

[0050] Assume that the radar radiation source signal carrier frequency is 2.8GHz, the transmission signal power is 400kW, and the transmission antenna gain is 40dB. The reconnaissance station power measurement resolution is 0.5dB, and the direction finding accuracy is 1°.

[0051] Figure 2 The error distribution diagram obtained by using the single-station positioning method of the present invention is shown. It can be seen that in the above-mentioned transmission and reception scenario, the positioning error of the method of the present invention is positively correlated with the distance. When the distance is short, the positioning error is small and the positioning accuracy is high.

[0052] It should be noted that within the scope of protection defined in the claims of the present invention, the following embodiments can be combined and / or expanded or replaced in any logical way from the above specific implementation methods, such as disclosed technical principles, disclosed technical features or implicitly disclosed technical features.

[0053] Example 1

[0054] A single-station positioning method applicable to a passive reconnaissance system comprises:

[0055] By measuring the signal power at the receiving aperture and the azimuth information of the radiation source, single-station rapid positioning can be achieved in combination with radar prior information.

[0056] Example 2

[0057] On the basis of Example 1, the method of measuring the receiving aperture signal power and the radiation source azimuth information and combining the radar prior information to realize single-station rapid positioning specifically includes the following sub-steps:

[0058] First, the signal power from the radiation source to the antenna aperture of the single-station reconnaissance system is measured;

[0059] Then, based on the principle of electromagnetic wave propagation, the propagation distance of the radiation source and target is calculated in reverse;

[0060] Finally, the radar position is calculated based on the direction of the radar radiation source.

[0061] Example 3

[0062] On the basis of Example 2, the method of measuring the signal power of the radiation source reaching the antenna aperture of the single-station reconnaissance system specifically includes the following sub-steps:

[0063] The signal power of the radar signal propagating through the atmosphere and reaching the antenna aperture of the single-station reconnaissance system is:

[0064]

[0065] Where f is the frequency of the radiation source target, P T is the emission power of the radiation source target, G Tis the antenna power of the radiation source target, R is the propagation distance of the radiation source target, λ is the wavelength of the radiation source target and

[0066] λ=c / f (2)

[0067] c is the speed of light, and f is the target frequency of the radiation source.

[0068] Example 4

[0069] On the basis of Example 3, the reverse calculation of the radiation source target distance according to the electromagnetic wave propagation principle specifically includes the following sub-steps:

[0070] The frequency f of the radiation source target is obtained by measurement, and the transmission power P T , transmitting antenna power G T Through the acquisition of prior intelligence, the radiation source target propagation distance R is calculated according to the following inverse formula:

[0071]

[0072] Example 5

[0073] Based on Example 4, the radiation source target propagation distance includes the following sub-steps:

[0074] For a single-station passive reconnaissance system, the radar radiation source azimuth θ is obtained by measurement, and the radar position is calculated based on this. The calculation formula is:

[0075]

[0076] Among them, x is the horizontal coordinate of the radar relative to the single-station reconnaissance system, and y is the vertical coordinate of the radar relative to the single-station reconnaissance system. 2 +y 2 =R 2 .

[0077] Example 6

[0078] A single-station positioning device suitable for a passive reconnaissance system comprises: a processor and a memory, wherein a computer program is stored in the memory, and when the computer program is loaded by the processor, a method as described in any one of Embodiments 1 to 5 is executed.

[0079] Example 7

[0080] A single-station positioning system suitable for a passive reconnaissance system includes the single-station positioning device suitable for a passive reconnaissance system as described in Example 6.

[0081] The units involved in the embodiments of the present invention may be implemented by software or hardware, and the units described may also be arranged in a processor. The names of these units do not, in some cases, limit the units themselves.

[0082] According to one aspect of an embodiment of the present invention, a computer program product or a computer program is provided, the computer program product or the computer program includes a computer instruction, and the computer instruction is stored in a computer-readable storage medium. A processor of a computer device reads the computer instruction from the computer-readable storage medium, and the processor executes the computer instruction, so that the computer device executes the method provided in the above various optional implementations.

[0083] As another aspect, an embodiment of the present invention further provides a computer-readable medium, which may be included in the electronic device described in the above embodiment; or may exist independently without being assembled into the electronic device. The above computer-readable medium carries one or more programs, and when the above one or more programs are executed by an electronic device, the electronic device implements the method described in the above embodiment.

Claims

1. A single-station positioning method suitable for a passive reconnaissance system, characterized in that: include: By measuring the signal power at the receiving aperture and the azimuth information of the radiation source, single-station rapid positioning can be achieved in combination with radar prior information.

2. The single-station positioning method applicable to a passive reconnaissance system according to claim 1, characterized in that: The method of measuring the receiving port signal power and the radiation source azimuth information and combining the radar prior information to realize single-station rapid positioning specifically includes the following sub-steps: First, the signal power from the radiation source to the antenna aperture of the single-station reconnaissance system is measured; Then, based on the principle of electromagnetic wave propagation, the propagation distance of the radiation source and target is calculated in reverse; Finally, the radar position is calculated based on the direction of the radar radiation source.

3. The single-station positioning method applicable to a passive reconnaissance system according to claim 2, characterized in that: The method of measuring the signal power of the radiation source reaching the antenna aperture of the single-station reconnaissance system specifically includes the following sub-steps: The signal power of the radar signal propagating through the atmosphere and reaching the antenna aperture of the single-station reconnaissance system is: Where f is the frequency of the radiation source target, P T is the emission power of the radiation source target, G T is the antenna power of the radiation source target, R is the propagation distance of the radiation source target, λ is the wavelength of the radiation source target and λ=c / f (2) c is the speed of light, and f is the target frequency of the radiation source.

4. The single-station positioning method applicable to a passive reconnaissance system according to claim 3, characterized in that: The reverse calculation of the radiation source target distance according to the electromagnetic wave propagation principle specifically includes the following sub-steps: The frequency f of the radiation source target is obtained by measurement, and the transmission power P T , transmitting antenna power G T Through the acquisition of prior intelligence, the radiation source target propagation distance R is calculated according to the following inverse formula:

5. The single-station positioning method applicable to a passive reconnaissance system according to claim 4, characterized in that: The radiation source target propagation distance comprises the sub-steps of: For a single-station passive reconnaissance system, the radar radiation source azimuth θ is obtained by measurement, and the radar position is calculated based on this. The calculation formula is: Among them, x is the horizontal coordinate of the radar relative to the single-station reconnaissance system, and y is the vertical coordinate of the radar relative to the single-station reconnaissance system. 2 +y 2 =R 2 .

6. A single-station positioning device suitable for a passive reconnaissance system, characterized in that: include: A processor and a memory, wherein a computer program is stored in the memory, and when the computer program is loaded by the processor, the method according to any one of claims 1 to 5 is executed.

7. A single-station positioning system suitable for a passive reconnaissance system, characterized in that: It comprises a single-station positioning device suitable for a passive reconnaissance system as described in claim 6.

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