A transmission frequency control device and control method for frequency agile radar

Abstract

The present invention relates to a transmission frequency control device and control method of a frequency agile radar. The method comprises: receiving electromagnetic compatibility instructions and electromagnetic compatibility spectrum data given by the electromagnetic environment system where the frequency agile radar is located; based on the electromagnetic compatibility instructions and the electromagnetic compatibility spectrum data, receiving spectrum data in the electromagnetic environment, and extracting electromagnetic environment spectrum data of interest; generating a continuous frequency signal and a discrete frequency signal; under the frequency agile radar transmission trigger signal, receiving the current continuous frequency signal based on the continuous frequency signal, and generating a discrete frequency complement signal according to the electromagnetic environment spectrum data of interest, the current continuous frequency signal and the discrete frequency signal; generating a frequency control signal according to the current continuous frequency signal and the discrete frequency complement signal to control the transmission frequency of the current pulse repetition period of the frequency agile radar. The present invention can control the frequency agile radar to transmit an infinite frequency point, and improve the anti-interference performance of the frequency agile radar.

Description

Technical Field

[0001] The present invention relates to the field of frequency agile radar control, and in particular to a transmission frequency control device and a control method of a frequency agile radar. Background Art

[0002] Frequency agile radar has the advantages of strong anti-interference ability, large detection distance, high angle measurement accuracy, and strong sea clutter suppression ability, so it is widely used.

[0003] From the perspective of frequency change, the existing frequency agile radars can be divided into two basic types: one can be called discrete point frequency type, and the other can be called continuous frequency type.

[0004] F Domain =(f MIN ,f MAX ) represents the radar transmission frequency range, then the characteristic of discrete point frequency type frequency agile radar is that its available radar transmission frequency is F Domain The characteristic of continuous frequency frequency agile radar is that its available radar transmission frequency is F. Domain Infinite, continuous frequency.

[0005] The discrete point frequency agile radar can conveniently and flexibly control the transmission frequency, thereby achieving the following three advantages:

[0006] (1) The radar transmission frequency can be randomly changed. This random change can be controlled by a computer and appears to be irregular to the outside world, making it unpredictable. Due to its unpredictability, the enemy cannot grasp its specific value without reconnaissance, and therefore cannot carry out narrowband interference targeting a certain frequency. The only way is to implement interference targeting F Domain Carry out wideband interference to achieve high anti-interference gain for the radar;

[0007] (2) Based on the reconnaissance and analysis of the enemy's interference spectrum, the radar's transmission frequency can be set at the frequency point where the enemy's interference spectrum is weakest, thereby obtaining a higher anti-interference gain;

[0008] (3) The radar’s transmitting frequency can be determined immediately before the radar transmits a signal, thus facilitating electromagnetic compatibility control and firepower compatibility control.

[0009] The main disadvantage of discrete frequency agile radar is that since it can only use limited, discrete, fixed frequency points as the radar's transmission frequency, the enemy can detect all these frequency points in a very short time and then implement narrowband interference on these frequency points at the same time, which is the so-called targeting-blocking interference. DomainThe efficiency of wideband blocking jamming with a wide range and aiming-blocking jamming has been greatly improved.

[0010] The available transmission frequency of continuous frequency frequency agile radar is F Domain The range is continuous and its frequency points are infinite. From this perspective, both aiming jamming and aiming-blocking jamming are invalid. The only approach is to cover the entire F Domain The radar can obtain the highest anti-jamming gain because it can resist wideband blocking interference with a wide range. It can be said that this is the only advantage of continuous frequency type frequency agile radar over discrete point frequency type frequency agile radar.

[0011] The above two advantages (2) and (3) of discrete frequency agile radar are not possessed by continuous frequency agile radar. When radar exists in a system or a system (there are other radio electronic equipment in the system / system), this point (3) is particularly important. Any equipment that cannot meet the requirements of electromagnetic compatibility control and / or firepower compatibility control cannot be included in the system or system.

[0012] In fact, the transmission frequency of the continuous frequency type frequency agile radar has a strong time correlation. This time correlation is not difficult to detect externally; once it is acquired, it can implement very efficient targeted interference against the radar. From this perspective, the only advantage of the continuous frequency type frequency agile radar no longer exists, but its infinite / continuous transmission frequency is unquestionable. Summary of the invention

[0013] The purpose of the present invention is to provide a transmission frequency control device and control method for a frequency agile radar, so that the transmission frequency of the frequency agile radar has both the characteristics of flexible and controllable transmission frequency of discrete point frequency type frequency agile radar and the characteristics of unlimited transmission frequency of continuous frequency type frequency agile radar, thereby improving the anti-interference performance of the frequency agile radar.

[0014] To achieve the above object, the present invention provides the following solutions:

[0015] A transmission frequency control device for a frequency agile radar, comprising:

[0016] An electromagnetic compatibility instruction / spectrum data receiving module is used to receive electromagnetic compatibility instructions and electromagnetic compatibility spectrum data given by the electromagnetic environment system where the frequency agile radar is located; the electromagnetic compatibility instructions include a "none" state and a "yes" state;

[0017] An electromagnetic environment spectrum data receiving module is used to receive spectrum data in an electromagnetic environment based on the electromagnetic compatibility instruction and the electromagnetic compatibility spectrum data, and extract electromagnetic environment spectrum data of interest; the electromagnetic environment spectrum data of interest is electromagnetic spectrum data of non-friendly parties in the radar's permitted transmission frequency range; the electromagnetic spectrum data of non-friendly parties includes electromagnetic spectrum data of enemy parties, friendly parties, neutral parties or unknown parties;

[0018] A basic frequency generation module, used to generate continuous frequency signals and discrete frequency signals;

[0019] A discrete frequency compensation module is used for receiving, based on the continuous frequency signal, a current continuous frequency signal generated by the basic frequency generation module read by the transmission frequency synthesis module when the frequency agile radar transmits a trigger signal to the transmission frequency synthesis module, and generating a discrete frequency compensation signal according to the electromagnetic environment spectrum data of interest, the current continuous frequency signal and the discrete frequency signal;

[0020] The transmitting frequency synthesis module is used to generate a frequency control signal according to the current continuous frequency signal and the discrete frequency compensation signal; the frequency control signal is used to control the transmitting frequency of the current pulse repetition period of the frequency agile radar.

[0021] Optionally, also include:

[0022] An electromagnetic compatibility frequency control determination module is used to determine that the electromagnetic environment system where the frequency agile radar is located performs electromagnetic compatibility frequency control on the frequency agile radar according to the electromagnetic compatibility spectrum data when the electromagnetic compatibility instruction is in the "yes" state;

[0023] The module for determining whether to perform electromagnetic compatibility frequency control is used to determine that the electromagnetic environment system where the frequency agile radar is located does not perform electromagnetic compatibility frequency control on the frequency agile radar when the electromagnetic compatibility instruction is in a "none" state.

[0024] Optionally, the discrete frequency compensation module specifically includes:

[0025] A transmitted frequency set acquisition unit, used to acquire the transmitted frequency set stored in the transmission frequency synthesis module;

[0026] A transmitting frequency selection unit for a current pulse repetition period, configured to select a transmitting frequency for the current pulse repetition period from the electromagnetic environment spectrum data of interest according to a principle of weakest interference, a frequency agility criterion, and the set of transmitted frequencies;

[0027] A current continuous frequency signal receiving unit, used to receive the current continuous frequency signal generated by the basic frequency generation module and read by the transmission frequency synthesis module;

[0028] The discrete frequency compensation unit is used to determine a discrete frequency compensation signal according to the current continuous frequency signal and the transmission frequency.

[0029] Optionally, the transmission frequency selection unit of the current pulse repetition period specifically includes:

[0030] A frequency band sequence determination subunit, configured to determine the frequency band and frequency band sequence corresponding to the electromagnetic environment spectrum data of interest by using an interference frequency analyzer according to the weakest interference principle;

[0031] A center frequency determination subunit, used to determine the center frequency of the frequency band sequence;

[0032] A first judgment subunit is used to judge whether the center frequency meets the frequency agility criterion to obtain a first judgment result;

[0033] A second judgment subunit is configured to, if the first judgment result indicates that the center frequency meets the frequency agility criterion, judge whether the center frequency belongs to the transmitted frequency set to obtain a second judgment result;

[0034] a transmission frequency determination subunit, configured to use the center frequency as the transmission frequency of the current pulse repetition period if the second judgment result indicates that the center frequency does not belong to the set of transmitted frequencies;

[0035] The step returns to the first subunit, and is used for returning to the step of "determining the frequency band and frequency band sequence corresponding to the electromagnetic environment spectrum data of interest by using an interference frequency analyzer according to the weakest interference principle" if the second judgment result indicates that the center frequency belongs to the transmitted frequency set or the first judgment result indicates that the center frequency does not meet the frequency agility criterion, and re-acquiring the frequency band sequence;

[0036] The step returns to the second subunit, and is used to return to the step of "determining the frequency band and frequency band sequence corresponding to the electromagnetic environment spectrum data of interest using an interference frequency analyzer according to the weakest interference principle" if the first judgment result indicates that the center frequency does not meet the frequency agility criterion, and re-acquire the frequency band sequence.

[0037] Optionally, the transmission frequency synthesis module specifically includes:

[0038] The frequency control signal generating unit is used to use the difference frequency between the current continuous frequency signal and the discrete frequency complement signal as the frequency control signal.

[0039] A method for controlling the transmission frequency of a frequency agile radar, comprising:

[0040] Receiving electromagnetic compatibility instructions and electromagnetic compatibility spectrum data given by the electromagnetic environment system where the frequency agile radar is located; the electromagnetic compatibility instructions include a "none" state and a "yes" state;

[0041] Based on the electromagnetic compatibility instruction and the electromagnetic compatibility spectrum data, spectrum data in the electromagnetic environment is received, and the electromagnetic environment spectrum data of interest is extracted; the electromagnetic environment spectrum data of interest is non-friendly electromagnetic spectrum data in the radar's permitted transmission frequency range; the non-friendly electromagnetic spectrum data includes electromagnetic spectrum data of an enemy, a friendly, a neutral or an unknown party;

[0042] Generate continuous frequency signals as well as discrete frequency signals;

[0043] When the frequency agile radar transmits a trigger signal to the transmission frequency synthesis module, based on the continuous frequency signal, a current continuous frequency signal generated by the basic frequency generation module read by the transmission frequency synthesis module is received, and a discrete frequency complement signal is generated according to the electromagnetic environment spectrum data of interest, the current continuous frequency signal and the discrete frequency signal;

[0044] A frequency control signal is generated according to the current continuous frequency signal and the discrete frequency complement signal; the frequency control signal is used to control the transmission frequency of the current pulse repetition period of the frequency agile radar.

[0045] Optionally, the receiving electromagnetic compatibility instruction and electromagnetic compatibility spectrum data given by the electromagnetic environment system where the frequency agile radar is located, and then further comprising:

[0046] When the electromagnetic compatibility instruction is in the "yes" state, determining that the electromagnetic environment system where the frequency agile radar is located performs electromagnetic compatibility frequency control on the frequency agile radar according to the electromagnetic compatibility spectrum data;

[0047] When the electromagnetic compatibility instruction is in a "none" state, it is determined that the electromagnetic environment system where the frequency agile radar is located does not perform electromagnetic compatibility frequency control on the frequency agile radar.

[0048] Optionally, when the frequency agile radar transmits a trigger signal to the transmission frequency synthesis module, based on the continuous frequency signal, receiving a current continuous frequency signal generated by a basic frequency generation module read by the transmission frequency synthesis module, and generating a discrete frequency complement signal according to the electromagnetic environment spectrum data of interest, the current continuous frequency signal and the discrete frequency signal, specifically includes:

[0049] Acquire the transmitted frequency set stored in the transmitting frequency synthesis module;

[0050] According to the weakest interference principle, the frequency agility criterion and the transmitted frequency set, selecting the transmission frequency of the current pulse repetition period in the electromagnetic environment spectrum data of interest;

[0051] Receiving a current continuous frequency signal generated by the basic frequency generation module and read by the transmission frequency synthesis module;

[0052] A discrete frequency complement signal is determined according to the current continuous frequency signal and the transmitting frequency.

[0053] Optionally, selecting the transmission frequency of the current pulse repetition period in the electromagnetic environment spectrum data of interest according to the weakest interference principle, the frequency agility criterion and the transmitted frequency set specifically includes:

[0054] According to the weakest interference principle, using an interference frequency analyzer to determine the frequency band and frequency band sequence corresponding to the electromagnetic environment spectrum data of interest;

[0055] Determining the center frequency of the frequency band sequence;

[0056] Determine whether the center frequency meets the frequency agility criterion to obtain a first determination result;

[0057] If the first judgment result indicates that the center frequency meets the frequency agility criterion, determine whether the center frequency belongs to the transmitted frequency set to obtain a second judgment result;

[0058] If the second judgment result indicates that the center frequency does not belong to the transmitted frequency set, the center frequency is used as the transmission frequency of the current pulse repetition period;

[0059] If the second judgment result indicates that the center frequency belongs to the transmitted frequency set, return to the step of "determining the frequency band and frequency band sequence corresponding to the electromagnetic environment spectrum data of interest by using an interference frequency analyzer according to the weakest interference principle" to reacquire the frequency band sequence;

[0060] If the first judgment result indicates that the center frequency does not meet the frequency agility criterion, return to the step of "determining the frequency band and frequency band sequence corresponding to the electromagnetic environment spectrum data of interest using an interference frequency analyzer according to the weakest interference principle" to re-acquire the frequency band sequence.

[0061] Optionally, the generating a frequency control signal according to the current continuous frequency signal and the discrete frequency compensation signal specifically includes:

[0062] The difference frequency between the current continuous frequency signal and the discrete frequency complement signal is used as a frequency control signal.

[0063] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects: the present invention provides a transmission frequency control device and a control method for a frequency agile radar. By performing frequency control on the frequency agile radar based on the device disclosed by the present invention, the frequency agile radar can take into account the advantages of both discrete point frequency type frequency agile radar and continuous frequency type frequency agile radar; extract electromagnetic environment spectrum data of interest, use the generated continuous frequency signal and discrete frequency signal, and generate a discrete frequency compensation signal based on the electromagnetic environment spectrum data of interest, thereby controlling the transmission frequency of the frequency agile radar to be an infinite point frequency; at the same time, frequency control is performed on the weak frequency points of enemy interference according to the electromagnetic environment spectrum data of interest, thereby improving the anti-interference performance of the frequency agile radar. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] 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 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 work.

[0065] Figure 1 This is a structural diagram of a transmission frequency control device for a frequency agile radar provided by the present invention;

[0066] Figure 2 A block diagram of the interference frequency analyzer provided by the present invention;

[0067] Figure 3 This is a flow chart of the transmission frequency control method of the frequency agile radar provided by the present invention. DETAILED DESCRIPTION

[0068] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0069] The object of the present invention is to provide a transmission frequency control device and a control method for a frequency agile radar, so that the frequency agile radar can transmit an infinite frequency point, thereby improving the anti-interference performance.

[0070] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0071] Figure 1The structure diagram of the transmission frequency control device of the frequency agile radar provided by the present invention is as follows: Figure 1 As shown, a transmission frequency control device of a frequency agile radar comprises:

[0072] The electromagnetic compatibility instruction / spectrum data receiving module is used to receive the electromagnetic compatibility instruction and electromagnetic compatibility spectrum data given by the electromagnetic environment system where the frequency agile radar is located; the electromagnetic compatibility instruction includes a "none" state and a "yes" state.

[0073] In practical applications, the present invention also includes: an electromagnetic compatibility frequency control determination module, which is used to determine that the electromagnetic environment system where the frequency agile radar is located performs electromagnetic compatibility frequency control on the frequency agile radar according to the electromagnetic compatibility spectrum data when the electromagnetic compatibility instruction is in the "yes" state; and a non-electromagnetic compatibility frequency control determination module, which is used to determine that the electromagnetic environment system where the frequency agile radar is located does not perform electromagnetic compatibility frequency control on the frequency agile radar when the electromagnetic compatibility instruction is in the "no" state.

[0074] The electromagnetic compatibility instruction / spectrum data receiving module is used to receive electromagnetic compatibility instructions and electromagnetic compatibility spectrum data given by the system or architecture.

[0075] Among them, the system or system can integrate the status and parameters of each radio electronic equipment to give electromagnetic compatibility instructions and electromagnetic compatibility spectrum data. The so-called electromagnetic compatibility spectrum data means that these frequencies will affect the normal use of other radio electronic equipment in the system or system, so the radar cannot use these frequencies when performing frequency control.

[0076] The electromagnetic compatibility instruction contains two possible states: one state is "none", indicating that the system or system does not perform electromagnetic compatibility spectrum control on the radar. At this time, the electromagnetic compatibility instruction / spectrum data receiving module has no effect on the operation of the frequency control device, and the frequency control device works without considering the electromagnetic compatibility spectrum data; the other state is "yes", indicating that the system or system wants to perform electromagnetic compatibility spectrum control on the radar. At this time, the electromagnetic compatibility instruction / spectrum data receiving module will have an effect on the operation of the frequency control device, and the specific effect depends on the electromagnetic compatibility spectrum data received by the electromagnetic compatibility instruction / spectrum data receiving module.

[0077] The electromagnetic environment spectrum data receiving module is used to receive spectrum data in the electromagnetic environment based on the electromagnetic compatibility instruction and the electromagnetic compatibility spectrum data, and extract the electromagnetic environment spectrum data of interest; the electromagnetic environment spectrum data of interest is non-friendly electromagnetic spectrum data within the radar's allowed transmission frequency range; the non-friendly electromagnetic spectrum data includes electromagnetic spectrum data of the enemy, friendly, neutral or unknown party.

[0078] In practical applications, the electromagnetic environment spectrum data receiving module is used to receive spectrum data in the electromagnetic environment and extract the electromagnetic environment spectrum data of interest for the discrete frequency compensation module. Here, the electromagnetic environment spectrum data of interest refers to the radar's allowed transmission frequency range F Work The non-our electromagnetic spectrum data in the Interest .

[0079] exist Figure 1 Medium, F Domain is the frequency range that the radar can transmit, F Domain and F Work The relationship is When the EMC instruction is "None", no EMC spectrum control is performed, then F Work =F Domain ; When the electromagnetic compatibility directive is in the "yes" state, {f|f∈F Work =F Domain -F Forbid}, where F Forbid is the electromagnetic compatibility spectrum data, that is, F Work Yes F Domain Spectrum data other than electromagnetic compatibility spectrum data.

[0080] The so-called non-friends refer to those that are not under our control, including enemies, possible friends, neutral parties or unknown parties. Filters can be used to extract the electromagnetic environment spectrum data of interest to us; the electromagnetic environment spectrum data of interest is used for discrete frequency compensation module.

[0081] The basic frequency generation module is used to generate continuous frequency signals and discrete frequency signals.

[0082] In practical applications, the basic frequency generation module includes two submodules, one is a continuous frequency signal generation submodule, and the other is a discrete frequency signal generation submodule, which are used to generate a continuous frequency signal and a discrete frequency signal respectively.

[0083] The continuous frequency signal generation submodule is used to generate the frequency (denoted as f c (t)) in F Domain A low-power signal that changes rapidly and continuously within a range; f c (t) varies with time according to a trigonometric function.

[0084] Discrete frequency signal generation submodule, used to generate 0~f MAX -f MIN The L frequency signals with intervals of Δf are recorded as Ω, that is, Ω={Δf,2Δf,…,LΔf}.

[0085] The continuous frequency signal and discrete frequency signal generated by the basic frequency generation module are given to the transmission frequency synthesis module.

[0086] The discrete frequency compensation module is used to receive the current continuous frequency signal generated by the basic frequency generation module read by the transmitting frequency synthesis module based on the continuous frequency signal when the frequency agile radar transmits a trigger signal to the transmitting frequency synthesis module, and generate a discrete frequency compensation signal according to the electromagnetic environment spectrum data of interest, the current continuous frequency signal and the discrete frequency signal.

[0087] In practical applications, the discrete frequency compensation module specifically includes: a transmitted frequency set acquisition unit, which is used to acquire the transmitted frequency set stored in the transmitting frequency synthesis module; a transmitting frequency selection unit of the current pulse repetition period, which is used to select the transmitting frequency of the current pulse repetition period in the electromagnetic environment spectrum data of interest according to the weakest interference principle, the frequency agility criterion and the transmitted frequency set; a current continuous frequency signal receiving unit, which is used to receive the current continuous frequency signal generated by the basic frequency generation module read by the transmitting frequency synthesis module; and a discrete frequency compensation unit, which is used to determine a discrete frequency compensation signal according to the current continuous frequency signal and the transmitting frequency.

[0088] The transmitting frequency selection unit of the current pulse repetition period specifically includes: a frequency band sequence determination subunit, which is used to determine the frequency band and frequency band sequence corresponding to the electromagnetic environment spectrum data of interest by using an interference frequency analyzer according to the weakest interference principle; a center frequency determination subunit, which is used to determine the center frequency of the frequency band sequence; a first judgment subunit, which is used to judge whether the center frequency meets the frequency agility criterion to obtain a first judgment result; a second judgment subunit, which is used to judge whether the center frequency belongs to the transmitted frequency set if the first judgment result indicates that the center frequency meets the frequency agility criterion to obtain a second judgment result; and a transmitting frequency determination subunit, which is used to judge whether the center frequency belongs to the transmitted frequency set if the second judgment result indicates that the center frequency does not belong to the transmitted frequency set. Then the center frequency is used as the transmitting frequency of the current pulse repetition period; the step returns to the first subunit, and if the second judgment result indicates that the center frequency belongs to the transmitted frequency set or the first judgment result indicates that the center frequency does not meet the frequency agility criterion, returns to the step of "determining the frequency bands and frequency band sequences corresponding to the electromagnetic environment spectrum data of interest using an interference frequency analyzer according to the weakest interference principle" to reacquire the frequency band sequence; the step returns to the second subunit, and if the first judgment result indicates that the center frequency does not meet the frequency agility criterion, returns to the step of "determining the frequency bands and frequency band sequences corresponding to the electromagnetic environment spectrum data of interest using an interference frequency analyzer according to the weakest interference principle" to reacquire the frequency band sequence.

[0089] In practical applications, the discrete frequency compensation module is used to generate discrete frequency compensation signals and output them to the transmission frequency synthesis module. The discrete frequency compensation module generates discrete frequency compensation signals in two steps:

[0090] Step 1: According to the weakest interference principle, the frequency agility criterion and the transmitted frequency set E stored in the transmitting frequency synthesis module, Interest Select the transmission frequency f of this pulse repetition interval (PRI) tran .

[0091] Step 2: Receive the frequency f provided by the transmission frequency synthesis module c (t1), find f c (t1)-f tran , and then look for the same value in Ω as |f c (t1)-f tran |The closest value, as the discrete complementary frequency f Δ The value of f Δ The positive and negative of f c (t1)-f tran Consistent.

[0092] Furthermore, in step 1, the weakest interference principle, that is, in F Interest (derived from the electromagnetic environment data receiving module) to find the frequency band where the weakest interference signal is located, and then control the frequency of the frequency agile radar based on the weakest interference frequency band.

[0093] To find the frequency band where the weakest interference signal is located, use Figure 2 The interference frequency analyzer shown in the figure works as follows: first, the electromagnetic environment data is down-converted to make the signal frequency down-converted to the working frequency of the analog-to-digital converter; the analog-to-digital converter converts the analog signal into a digital signal; the digital signal processor analyzes and processes the digital signal to obtain the frequency band where the weakest interference signal is located. The digital signal processor adopts a channelized structure, in which Denote the transfer function as h k (n) digital filters, there are N digital filters in total, the bandwidth of the N filters is the same, but the center frequency is different, F Interest The data in will pass through the digital filters corresponding to their respective frequency bands. If the data is x(n), then the output of x(n) passing through the kth filter is y k (n) = x(n)*h k (n); The mixer will y k (n) frequency conversion to baseband; It means that the baseband digital signal is extracted M times to further reduce the speed of the signal; the threshold detection is performed on the digital signal after the speed reduction. If the signal exceeds the threshold, the counter is increased by 1 (the counter is cleared at the beginning of each PRI); finally, the values ​​in each counter are compared by a comparator and sorted (in order from small to large or from large to small) to form a frequency band sequence S, in which the frequency band with the smallest value is the frequency band where there is no interference or the weakest interference signal.

[0094] Furthermore, in step 1, the frequency agility criterion refers to that the carrier frequencies of adjacent transmitted pulses of the frequency agile radar take different values ​​within a certain range (usually the instantaneous bandwidth of the output stage), and the difference between them should be greater than a certain critical value. The above critical value is also called the critical frequency, which is the minimum frequency difference required to ensure the decorrelation of adjacent echoes.

[0095] Further, in step 1, according to the weakest interference principle, the frequency agility criterion and the transmission frequency set E stored in the transmission frequency synthesis module, in F Interest Select the transmission frequency f of this PRI tran , that is, in F Interest In the process, the frequency band sequence S formed by the interference frequency analyzer starts from the frequency band corresponding to the minimum count value and selects the transmission frequency f of this PRI. tran .

[0096] Furthermore, the frequency band sequence S is selected from the frequency band corresponding to the minimum count value to select the transmission frequency f of the current PRI. tran include:

[0097] Step 1: Take a frequency band f from S in ascending order of count values i ~f i+1 , calculate its center frequency

[0098] Step 2: Determine f middle Check whether the frequency agility criterion is met. If yes, proceed to step 3; otherwise, return to step 1 and select a new frequency band.

[0099] Step 3: Determine f middle Does it belong to E? If not, f middle As the transmission frequency f of this PRI tran , otherwise return to step 1 and re-select the frequency band.

[0100] The transmitting frequency synthesis module is used to generate a frequency control signal according to the current continuous frequency signal and the discrete frequency compensation signal; the frequency control signal is used to control the transmitting frequency of the current pulse repetition period of the frequency agile radar.

[0101] The transmitting frequency synthesis module specifically includes: a frequency control signal generating unit, which is used to use the difference frequency between the current continuous frequency signal and the discrete complementary frequency signal as the frequency control signal.

[0102] In practical applications, the function of the transmission frequency synthesis module is to generate a frequency control signal to control the current PRI transmission frequency of the frequency agile radar and store the frequency value of the control signal. The specific steps include:

[0103] Step 1: The transmission frequency synthesis module receives the transmission trigger signal generated by the frequency agile radar transmitter.

[0104] Step 2: Under the trigger of the transmission trigger signal, the transmission frequency synthesis module reads the frequency f of the low-power signal generated by the basic frequency generation module-continuous frequency signal generation submodule at the current moment c (t1) and keep it, then f c (t1) is passed to the discrete frequency patching module.

[0105] Step 3: The discrete compensation frequency module generates the compensation frequency f Δ After that, the transmitting frequency synthesis module receives f Δ , then for f c (t1) and f Δ Take the difference and get f Control =f c (t1)-f Δ , use f Control The output of the frequency control device controls the current PRI transmission frequency of the frequency agile radar.

[0106] Step 4: Store f at a certain depth Control , and output to the discrete frequency compensation module.

[0107] Furthermore, in step 4, each PRI stores the f generated by the current PRI. Control In addition, the transmit frequency synthesis module also retains the f generated by the previous few PRIs Control The storage depth is the total number of PRIs stored. Control The storage depth depends on the randomness of the frequency of the frequency agile radar. The deeper the depth, the better the randomness, but the heavier the hardware burden of the frequency control device. Let the number of PRIs required for the radar beam to sweep a beam width be M, and the number of PRIs required for a radar scanning cycle be N, then the storage depth can be selected within M to N; let the storage depth be D, and the set of transmission frequencies stored at the depth D be E.

[0108] Figure 3 The flowchart of the transmission frequency control method of the frequency agile radar provided by the present invention is as follows: Figure 3As shown, a transmission frequency control method of a frequency agile radar includes:

[0109] Step 301: Receive electromagnetic compatibility instructions and electromagnetic compatibility spectrum data given by the electromagnetic environment system where the frequency agile radar is located; the electromagnetic compatibility instructions include a "none" state and a "yes" state.

[0110] In actual applications, step 301 also includes: when the electromagnetic compatibility instruction is in the "yes" state, determining that the electromagnetic environment system where the frequency agile radar is located performs electromagnetic compatibility frequency control on the frequency agile radar according to the electromagnetic compatibility spectrum data; when the electromagnetic compatibility instruction is in the "no" state, determining that the electromagnetic environment system where the frequency agile radar is located does not perform electromagnetic compatibility frequency control on the frequency agile radar.

[0111] Step 302: Based on the electromagnetic compatibility instruction and the electromagnetic compatibility spectrum data, spectrum data in the electromagnetic environment is received, and the electromagnetic environment spectrum data of interest is extracted; the electromagnetic environment spectrum data of interest is non-friendly electromagnetic spectrum data within the radar's allowed transmission frequency range; the non-friendly electromagnetic spectrum data includes electromagnetic spectrum data of the enemy, friendly, neutral or unknown party.

[0112] Step 303: Generate a continuous frequency signal and a discrete frequency signal.

[0113] Step 304: When the frequency agile radar sends a trigger signal to the transmitting frequency synthesis module, based on the continuous frequency signal, a current continuous frequency signal generated by the basic frequency generation module read by the transmitting frequency synthesis module is received, and a discrete frequency compensation signal is generated according to the electromagnetic environment spectrum data of interest, the current continuous frequency signal and the discrete frequency signal.

[0114] In practical applications, the step 304 specifically includes: obtaining the set of transmitted frequencies stored in the transmitting frequency synthesis module; selecting the transmitting frequency of the current pulse repetition period in the electromagnetic environment spectrum data of interest according to the weakest interference principle, the frequency agility criterion and the set of transmitted frequencies; receiving the current continuous frequency signal generated by the basic frequency generation module read by the transmitting frequency synthesis module; and determining the discrete frequency compensation signal according to the current continuous frequency signal and the transmitting frequency.

[0115] The method of selecting the transmission frequency of the current pulse repetition period in the electromagnetic environment spectrum data of interest according to the weakest interference principle, the frequency agility criterion and the transmitted frequency set specifically includes: according to the weakest interference principle, using an interference frequency analyzer to determine the frequency band and frequency band sequence corresponding to the electromagnetic environment spectrum data of interest; determining the center frequency of the frequency band sequence; judging whether the center frequency meets the frequency agility criterion to obtain a first judgment result; if the first judgment result indicates that the center frequency meets the frequency agility criterion, judging whether the center frequency belongs to the transmitted frequency set to obtain a second judgment result; if the second judgment result indicates that If the center frequency does not belong to the transmitted frequency set, the center frequency is used as the transmitting frequency of the current pulse repetition period; if the second judgment result indicates that the center frequency belongs to the transmitted frequency set, return to the step of "determining the frequency bands and frequency band sequences corresponding to the electromagnetic environment spectrum data of interest using an interference frequency analyzer according to the weakest interference principle" to reacquire the frequency band sequence; if the first judgment result indicates that the center frequency does not meet the frequency agility criterion, return to the step of "determining the frequency bands and frequency band sequences corresponding to the electromagnetic environment spectrum data of interest using an interference frequency analyzer according to the weakest interference principle" to reacquire the frequency band sequence.

[0116] Step 305: Generate a frequency control signal according to the current continuous frequency signal and the discrete frequency complement signal; the frequency control signal is used to control the transmission frequency of the current pulse repetition period of the frequency agile radar.

[0117] The step 305 specifically includes: using the difference frequency between the current continuous frequency signal and the discrete complementary frequency signal as a frequency control signal.

[0118] In practical applications, the frequency agile radar transmission frequency control method is as follows:

[0119] Step 1: According to the electromagnetic compatibility instruction received by the electromagnetic compatibility instruction / spectrum data receiving module, determine whether to perform electromagnetic compatibility spectrum control. If the electromagnetic compatibility instruction is "no", electromagnetic compatibility spectrum control is not performed, and the electromagnetic compatibility spectrum data does not act on the frequency control device. If the electromagnetic compatibility instruction is "yes", electromagnetic compatibility spectrum control is performed, and the electromagnetic compatibility spectrum data acts on the frequency control device.

[0120] In step 1, the electromagnetic compatibility spectrum data is in the form of Indicates that these N frequency bands are restricted areas for radar transmission frequencies, that is, radar transmission frequencies are not allowed within these N frequency bands. The prohibited frequency bands are marked with the lower frequency limit f iForbidMIN and the upper frequency limit f iForbidMAX To stipulate; suppose the radar transmission frequency range is FDomain =[f MIN ,f MAX ]. Accordingly, when the system or system needs to perform electromagnetic compatibility control on the radar, the set of radar transmission frequencies f allowed is {f|f∈F Work =F Domain -F Forbid},Right now

[0121] Step 2: The electromagnetic environment spectrum data receiving module receives the electromagnetic environment spectrum data and extracts the electromagnetic environment spectrum data of interest.

[0122] In step 2, let the electromagnetic environment data we are interested in be F Interest ,

[0123] Step 3: The basic frequency generation module generates continuous frequency f c (t) signal and discrete frequency Ω signal.

[0124] Step 4: The discrete frequency compensation module generates a discrete frequency compensation signal to the transmission frequency synthesis module.

[0125] Step 5: The transmission frequency synthesis module generates the control frequency f Control Control the current PRI transmission frequency of the frequency agile radar and store the control frequency f at a certain depth Control .

[0126] In step 5, the transmission frequency synthesis module generates a frequency control signal in four steps:

[0127] Step 1: The transmission frequency synthesis module receives the transmission trigger signal generated by the frequency agile radar transmitter.

[0128] Step 2: Under the trigger of the transmission trigger signal, the transmission frequency synthesis module reads the frequency f of the low-power signal generated by the basic frequency generation module-continuous frequency signal generation submodule at the current moment c (t1) and keep it, then f c (t1) is passed to the discrete frequency patching module.

[0129] Step 3: The discrete compensation frequency module generates the compensation frequency f Δ After that, the transmitting frequency synthesis module receives f Δ , then for f c (t1) and f Δ Take the difference and get f Control =f c (t1)-f Δ , use f Control The output of the frequency control device controls the current PRI transmission frequency of the frequency agile radar.

[0130] Step 4: Store f at a certain depth Control , and output to the discrete frequency compensation module. In each PRI, the f generated by the current PRI is stored. Control In addition, the transmit frequency synthesis module also retains the f generated by the previous few PRIs Control The storage depth is the total number of PRIs stored. Control The storage depth depends on the randomness of the frequency of the frequency agile radar. The deeper the depth, the better the randomness, but the heavier the hardware burden of the frequency control device. Let the number of PRIs required for the radar beam to sweep a beam width be M, and the number of PRIs required for a radar scanning cycle be N, then the storage depth can be selected within M to N; let the storage depth be D, and the set of transmission frequencies stored at the depth D be E.

[0131] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0132] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for controlling the transmission frequency of a frequency agile radar, characterized in that: include: Receiving electromagnetic compatibility instructions and electromagnetic compatibility spectrum data given by the electromagnetic environment system where the frequency agile radar is located; the electromagnetic compatibility instructions include a "none" state and a "yes" state; When the electromagnetic compatibility instruction is in the "yes" state, determining that the electromagnetic environment system where the frequency agile radar is located performs electromagnetic compatibility frequency control on the frequency agile radar according to the electromagnetic compatibility spectrum data; When the electromagnetic compatibility instruction is in a "none" state, determining that the electromagnetic environment system where the frequency agile radar is located does not perform electromagnetic compatibility frequency control on the frequency agile radar; Based on the electromagnetic compatibility instruction and the electromagnetic compatibility spectrum data, spectrum data in the electromagnetic environment is received, and the electromagnetic environment spectrum data of interest is extracted; the electromagnetic environment spectrum data of interest is non-friendly electromagnetic spectrum data in the radar's permitted transmission frequency range; the non-friendly electromagnetic spectrum data includes electromagnetic spectrum data of an enemy, a friendly, a neutral or an unknown party; Generate continuous frequency signals as well as discrete frequency signals; When the frequency agile radar transmits a trigger signal to the transmission frequency synthesis module, based on the continuous frequency signal, a current continuous frequency signal generated by the basic frequency generation module read by the transmission frequency synthesis module is received, and a discrete frequency complement signal is generated according to the electromagnetic environment spectrum data of interest, the current continuous frequency signal and the discrete frequency signal, specifically including: Acquire the transmitted frequency set stored in the transmitting frequency synthesis module; According to the weakest interference principle, the frequency agility criterion and the transmitted frequency set, selecting the transmission frequency of the current pulse repetition period in the electromagnetic environment spectrum data of interest specifically includes: According to the weakest interference principle, using an interference frequency analyzer to determine the frequency band and frequency band sequence corresponding to the electromagnetic environment spectrum data of interest; Determining the center frequency of the frequency band sequence; Determine whether the center frequency meets the frequency agility criterion to obtain a first determination result; If the first judgment result indicates that the center frequency meets the frequency agility criterion, determine whether the center frequency belongs to the transmitted frequency set to obtain a second judgment result; If the second judgment result indicates that the center frequency does not belong to the transmitted frequency set, the center frequency is used as the transmission frequency of the current pulse repetition period; If the second judgment result indicates that the center frequency belongs to the transmitted frequency set, return to the step of "determining the frequency band and frequency band sequence corresponding to the electromagnetic environment spectrum data of interest by using an interference frequency analyzer according to the weakest interference principle" to re-acquire the frequency band sequence; If the first judgment result indicates that the center frequency does not meet the frequency agility criterion, return to the step of "determining the frequency band and frequency band sequence corresponding to the electromagnetic environment spectrum data of interest by using an interference frequency analyzer according to the weakest interference principle" to re-acquire the frequency band sequence; Receiving a current continuous frequency signal generated by the basic frequency generation module and read by the transmission frequency synthesis module; Determine a discrete frequency complement signal according to the current continuous frequency signal and the transmitting frequency; Generating a frequency control signal according to the current continuous frequency signal and the discrete frequency complement signal specifically includes: The difference frequency between the current continuous frequency signal and the discrete frequency complement signal is used as a frequency control signal; the frequency control signal is used to control the transmission frequency of the current pulse repetition period of the frequency agile radar.

2. A transmission frequency control device for a frequency agile radar, characterized in that: The transmission frequency control device of the frequency agile radar adopts the transmission frequency control method of the frequency agile radar according to claim 1, and the transmission frequency control device of the frequency agile radar comprises: An electromagnetic compatibility instruction / spectrum data receiving module is used to receive electromagnetic compatibility instructions and electromagnetic compatibility spectrum data given by the electromagnetic environment system where the frequency agile radar is located; the electromagnetic compatibility instructions include a "none" state and a "yes" state; An electromagnetic environment spectrum data receiving module is used to receive spectrum data in an electromagnetic environment based on the electromagnetic compatibility instruction and the electromagnetic compatibility spectrum data, and extract electromagnetic environment spectrum data of interest; the electromagnetic environment spectrum data of interest is electromagnetic spectrum data of non-friendly parties in the radar's permitted transmission frequency range; the electromagnetic spectrum data of non-friendly parties includes electromagnetic spectrum data of enemy parties, friendly parties, neutral parties or unknown parties; A basic frequency generation module, used to generate continuous frequency signals and discrete frequency signals; A discrete frequency compensation module is used for receiving, based on the continuous frequency signal, a current continuous frequency signal generated by the basic frequency generation module read by the transmission frequency synthesis module when the frequency agile radar transmits a trigger signal to the transmission frequency synthesis module, and generating a discrete frequency compensation signal according to the electromagnetic environment spectrum data of interest, the current continuous frequency signal and the discrete frequency signal; The transmitting frequency synthesis module is used to generate a frequency control signal according to the current continuous frequency signal and the discrete frequency compensation signal; the frequency control signal is used to control the transmitting frequency of the current pulse repetition period of the frequency agile radar.

3. The transmission frequency control device of the frequency agile radar according to claim 2, characterized in that: Also includes: An electromagnetic compatibility frequency control determination module is used to determine that when the electromagnetic compatibility instruction is in the "yes" state, the electromagnetic environment system where the frequency agile radar is located performs electromagnetic compatibility frequency control on the frequency agile radar according to the electromagnetic compatibility spectrum data; The module for determining whether to perform electromagnetic compatibility frequency control is used to determine that the electromagnetic environment system where the frequency agile radar is located does not perform electromagnetic compatibility frequency control on the frequency agile radar when the electromagnetic compatibility instruction is in a "none" state.

4. The transmission frequency control device of the frequency agile radar according to claim 3, characterized in that: The discrete frequency compensation module specifically includes: A transmitted frequency set acquisition unit, used to acquire the transmitted frequency set stored in the transmission frequency synthesis module; A transmitting frequency selection unit for a current pulse repetition period, configured to select a transmitting frequency for the current pulse repetition period from the electromagnetic environment spectrum data of interest according to a principle of weakest interference, a frequency agility criterion, and the set of transmitted frequencies; A current continuous frequency signal receiving unit, used to receive the current continuous frequency signal generated by the basic frequency generation module and read by the transmission frequency synthesis module; The discrete frequency compensation unit is used to determine a discrete frequency compensation signal according to the current continuous frequency signal and the transmission frequency.

5. The transmission frequency control device of the frequency agile radar according to claim 4, characterized in that: The transmission frequency selection unit of the current pulse repetition period specifically includes: A frequency band sequence determination subunit, configured to determine the frequency band and frequency band sequence corresponding to the electromagnetic environment spectrum data of interest by using an interference frequency analyzer according to the weakest interference principle; A center frequency determination subunit, used to determine the center frequency of the frequency band sequence; A first judgment subunit is used to judge whether the center frequency meets the frequency agility criterion to obtain a first judgment result; A second judgment subunit is configured to, if the first judgment result indicates that the center frequency meets the frequency agility criterion, judge whether the center frequency belongs to the transmitted frequency set to obtain a second judgment result; a transmission frequency determination subunit, configured to use the center frequency as the transmission frequency of the current pulse repetition period if the second judgment result indicates that the center frequency does not belong to the set of transmitted frequencies; The step returns to the first subunit, and is used to return to the step of "determining the frequency band and frequency band sequence corresponding to the electromagnetic environment spectrum data of interest by using an interference frequency analyzer according to the weakest interference principle" to re-acquire the frequency band sequence if the second judgment result indicates that the center frequency belongs to the transmitted frequency set or the first judgment result indicates that the center frequency does not meet the frequency agility criterion; The step returns to the second subunit, and is used to return to the step of "determining the frequency band and frequency band sequence corresponding to the electromagnetic environment spectrum data of interest using an interference frequency analyzer according to the weakest interference principle" if the first judgment result indicates that the center frequency does not meet the frequency agility criterion, and re-acquire the frequency band sequence.

6. The transmission frequency control device of the frequency agile radar according to claim 5, characterized in that: The transmission frequency synthesis module specifically includes: The frequency control signal generating unit is used to use the difference frequency between the current continuous frequency signal and the discrete frequency complement signal as the frequency control signal.

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