Navigation receiver interference method and device based on two-phase coding

Abstract

The invention relates to a navigation receiver interference method and device based on two-phase coding, and the method comprises the steps: 1, generating 0 and 1 sequences with any length through a random information source, and converting the 0 and 1 sequences into-1 and 1 random sequences through polarity conversion; 2, generating binary data with a set code element length from the random sequences of-1 and 1; and step 3, carrying out product operation on the binary data and the intermediate frequency signal, and modulating into an interference signal. The interference bandwidth can be flexibly controlled only by modifying the width of the code element, redundant hardware resources do not need to be added, and the debugging efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of signal interference, and in particular to a navigation receiver interference method and device based on binary coding. Background Art

[0002] Navigation jamming technology has been applied to a variety of combat platforms, including naval, land, and air platforms, and is a key military technology in the field of navigation countermeasures. With the rapid development of navigation receiver technology, its positioning accuracy has become increasingly accurate, effectively supporting powerful enemies' ultra-long-range, deep-depth precision strikes, posing a significant threat to the defense of high-value military targets and key military locations. Therefore, researching efficient navigation jamming technology is of great military significance in disrupting enemy combat intent, undermining enemy tactical implementation, confusing enemy operational decisions, and ultimately ensuring the successful execution of our military operations.

[0003] Existing navigation jamming technology mainly relies on broadband noise suppression jamming. The baseband noise signal energy it generates is spread across the entire signal spectrum, which inevitably leads to the inability to maximize the utilization of the jamming energy. In addition, the noise interference bandwidth can only be controlled by designing digital filters. However, the design of digital filters affects the consumption of hardware resources and the jamming response time, resulting in poor flexibility and high debugging complexity. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a navigation receiver interference method and device based on binary coding, which solves the shortcomings of the prior art.

[0005] The object of the present invention is achieved through the following technical solution: a navigation receiver interference method based on two-phase coding, the interference method comprising:

[0006] Step 1: A random signal source generates a sequence of 0s and 1s of any length, and converts the sequence of 0s and 1s into a random sequence of -1s and 1s through polarity conversion;

[0007] Step 2: Generate a random sequence of -1 and 1 into binary data of a set symbol length;

[0008] Step 3: Multiply the binary data with the intermediate frequency signal and modulate it into an interference signal.

[0009] The step 1 specifically includes:

[0010] For the binary-coded interference signal, the signal model is: ,in, is the intermediate frequency signal; For the The phase corresponding to a binary source is related to , and then get ;

[0011] Perform polarity conversion on the source code. If the source code is 1, it remains unchanged. If the source code is 0, it is converted to -1, and we get ,in, The code element width is The binary code is 1 or -1.

[0012] The second step specifically includes:

[0013] If the code element is 1, then Rewrite as , and its corresponding signal frequency domain is , it can be seen that the interference energy is concentrated on the specified intermediate frequency signal near the frequency point to improve energy utilization;

[0014] By symbol width To determine the interference signal spectrum width, we get ,in, represents the interference signal bandwidth, Indicates the symbol rate by directly modifying the symbol width , the signal within the specified bandwidth can be suppressed to avoid energy waste.

[0015] A navigation receiver jammer based on binary coding, comprising: a signal conversion module, a code element setting module, and an interference signal generating module;

[0016] The signal conversion module is configured as a random signal source to generate a sequence of 0s and 1s of any length, and convert the sequence of 0s and 1s into a random sequence of -1s and 1s by polarity conversion;

[0017] The code element setting module is configured to generate a random sequence of -1 and 1 into binary data of a set code element length;

[0018] The interference signal generating module is configured to perform a product operation on the binary data and the intermediate frequency signal to modulate the result into an interference signal.

[0019] The signal conversion module specifically includes the following contents:

[0020] For the binary-coded interference signal, the signal model is: ,in, is the intermediate frequency signal; For the The phase corresponding to a binary source is related to , and then get ;

[0021] Perform polarity conversion on the source code. If the source code is 1, it remains unchanged. If the source code is 0, it is converted to -1, and we get ,in, The code element width is The binary code is 1 or -1.

[0022] The code element setting module specifically includes the following contents:

[0023] If the code element is 1, then Rewrite as , and its corresponding signal frequency domain is , it can be seen that the interference energy is concentrated on the specified intermediate frequency signal near the frequency point to improve energy utilization;

[0024] By symbol width To determine the interference signal spectrum width, we get ,in, represents the interference signal bandwidth, Indicates the symbol rate by directly modifying the symbol width , the signal within the specified bandwidth can be suppressed to avoid energy waste.

[0025] The present invention has the following advantages: a navigation receiver interference method and device based on two-phase coding can achieve flexible control of interference bandwidth by simply modifying the code element width, without adding redundant hardware resources, thereby improving debugging efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the process of the present invention;

[0027] Figure 2 The spectrum diagram of the interference signal frequency is 5MHz and the symbol rate is 0.1us;

[0028] Figure 3 The spectrum diagram of the interference signal frequency is 5MHz and the symbol rate is 0.2us;

[0029] Figure 4 This is a schematic diagram of the interference effect of existing broadband noise suppression;

[0030] Figure 5 Schematic diagram of the interference effect of the present invention. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of the present application provided below in conjunction with the drawings is not intended to limit the scope of protection of the present application for which protection is claimed, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. The present invention is further described below in conjunction with the drawings.

[0032] The present invention specifically relates to a navigation receiver jamming method based on binary coding, which solves the problems of existing broadband noise suppression jamming, such as interference energy dispersion, low utilization rate, and high complexity of interference bandwidth control. It has the advantages of simple and efficient implementation, can concentrate the interference energy on key frequency bands without increasing hardware resources, and flexibly control the interference bandwidth.

[0033] like Figure 1 As shown, the present invention generates a sequence of 0s and 1s of arbitrary length through a random signal source; polarity conversion converts it into a random sequence of -1 and 1; then, it is generated into binary data of a set code length; finally, it is modulated into an interference signal by performing a product operation with an intermediate frequency signal.

[0034] Furthermore, the navigation receiver interference process based on binary coding of the present invention is as follows:

[0035] For the binary-coded interference signal, the signal model is: ,in, is the intermediate frequency signal; For the The phase corresponding to a binary source is related to , and then Rewrite as On this basis, the source code is polarity transformed: if the source code is 1, it remains unchanged; if the source code is 0, it is transformed into -1, so there is ,in, The code element width is The binary code is 1 or -1.

[0036] To further analyze the interference signal bandwidth, without loss of generality, consider the code element to be 1, and Rewrite as , and its corresponding signal frequency domain is .

[0037] It can be seen that the interference signal spectrum obeys the sinc function distribution law, and the interference energy is concentrated at the specified frequency point. Nearby, improving energy utilization; code element width Determines the spectrum width of the interference signal. The specific relationship is:

[0038]

[0039] in, represents the interference signal bandwidth, Indicates the symbol rate. In summary, by directly modifying the symbol width , which can suppress the signal within the specified bandwidth and avoid energy waste.

[0040] like Figure 2 The figure shows the spectrum of a two-phase coded interference signal with a signal frequency of 5MHz and a symbol width of 0.1us. The interference signal is centered at 5MHz, with a suppression bandwidth of 20MHz. The spectrum distribution obeys the sinc function. Keeping the other conditions unchanged, the symbol width is changed to 0.2us. Figure 3 For its spectrum diagram, the suppression bandwidth is reduced to 10 MHz.

[0041] like Figure 4 and Figure 5 As shown in the above figure, it can be seen that the present invention concentrates the interference energy in the key spectrum range, and the spectrum distribution complies with the sinc function law, avoiding energy waste in non-key spectrum areas.

[0042] The foregoing description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Rather, the present invention is capable of various other combinations, modifications, and improvements, and is capable of modifications within the scope of the concepts described herein, through the above teachings, or through techniques or knowledge in the relevant fields. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be within the scope of the appended claims.

Claims

1. A navigation receiver jamming method based on binary phase coding, characterized by: The interference method includes: Step 1: A random signal source generates a sequence of 0s and 1s of any length, and converts the sequence of 0s and 1s into a random sequence of -1s and 1s through polarity conversion; Step 2: Generate a random sequence of -1 and 1 into binary data of a set symbol length; Step 3: Multiply the binary data with the intermediate frequency signal and modulate it into an interference signal.

2. The navigation receiver jamming method based on binary phase coding according to claim 1, characterized in that: The step 1 specifically includes: For the binary-coded interference signal, the signal model is: ,in, is the intermediate frequency signal; is the phase corresponding to the i-th binary signal source, and the relationship is , and then get ; Perform polarity conversion on the source code. If the source code is 1, it remains unchanged. If the source code is 0, it is converted to -1, and we get ,in, The code element width is The binary code is 1 or -1.

3. The navigation receiver jamming method based on binary phase coding according to claim 2, characterized in that: The second step specifically includes: If the code element is 1, then Rewrite as , and its corresponding signal frequency domain is , it can be seen that the interference energy is concentrated on the specified intermediate frequency signal near the frequency point to improve energy utilization; By symbol width To determine the interference signal spectrum width, we get ,in, represents the interference signal bandwidth, Indicates the symbol rate by directly modifying the symbol width , the signal within the specified bandwidth can be suppressed to avoid energy waste.

4. A navigation receiver jammer based on binary coding, characterized by: The device includes: a signal conversion module, a code element setting module and an interference signal generation module; The signal conversion module is configured as a random signal source to generate a sequence of 0s and 1s of any length, and convert the sequence of 0s and 1s into a random sequence of -1s and 1s by polarity conversion; The code element setting module is configured to generate a random sequence of -1 and 1 into binary data of a set code element length; The interference signal generating module is configured to perform a product operation on the binary data and the intermediate frequency signal to modulate the result into an interference signal.

5. The navigation receiver jammer based on binary phase coding according to claim 4, characterized in that: The signal conversion module specifically includes the following contents: For the binary-coded interference signal, the signal model is: ,in, is the intermediate frequency signal; is the phase corresponding to the i-th binary signal source, and the relationship is , and then get ; Perform polarity conversion on the source code. If the source code is 1, it remains unchanged. If the source code is 0, it is converted to -1, and we get ,in, The code element width is The binary code is 1 or -1.

6. The navigation receiver jammer based on binary coding according to claim 5, characterized in that: The code element setting module specifically includes the following contents: If the code element is 1, then Rewrite as , and its corresponding signal frequency domain is , it can be seen that the interference energy is concentrated on the specified intermediate frequency signal near the frequency point to improve energy utilization; By symbol width To determine the interference signal spectrum width, we get ,in, represents the interference signal bandwidth, Indicates the symbol rate by directly modifying the symbol width , the signal within the specified bandwidth can be suppressed to avoid energy waste.

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