CN103278805A

CN103278805A - Method for controlling searching power of radar on basis of radio frequency stealth in case of no prior guidance

Info

Publication number: CN103278805A
Application number: CN2013101914373A
Authority: CN
Inventors: 张贞凯; 徐兰; 袁伟; 杨永红
Original assignee: Jiangsu University of Science and Technology
Current assignee: Jiangsu University of Science and Technology
Priority date: 2013-05-21
Filing date: 2013-05-21
Publication date: 2013-09-04
Anticipated expiration: 2033-05-21
Also published as: CN103278805B

Abstract

The invention discloses a method for controlling searching energy of a radar on the basis of radio frequency stealth in the case of no prior guidance. The adopted method comprises the following steps of: firstly, carrying out initial searching on each region which needs to be searched by using a small power so as to determine a beam position at which a target possibly appears; and then on the premise of meeting the expected detection probability, carrying out confirmed searching on the beam position at which the target possibly appears. According to the invention, the radiation power when the radar searches is designed in the case of no prior guidance. According to the invention, radio frequency stealth performance of the radar can be further improved when the radar has higher searching performance.

Description

During the guiding of no priori based on the stealthy search lighting Poewr control method of radio frequency

Technical field

The invention belongs to radar signal processing field, specifically is a kind ofly not have priori when guiding based on the stealthy search lighting Poewr control method of radio frequency.

Background technology

Radar radio frequency stealth technology refers to the stealth technology that radar is resisted RF passive intercepting and capturing, sorting, identification, tracking, to reduce Passive Detention System to engagement range, the intercept probability of naval vessels.During search lighting, under the situation that does not influence the search lighting performance, reduce the emissive power of radar, can effectively improve the stealthy performance of radio frequency of radar, improve its viability.

When the guiding of no priori, how search strategy how to determine radar namely reasonably distributes the power of radar emission is the prior art problem demanding prompt solution.

Summary of the invention

Goal of the invention: at the problem and shortage of above-mentioned prior art existence, the purpose of this invention is to provide does not a kind ofly have priori when guiding based on the stealthy search lighting Poewr control method of radio frequency, finishes the distribution of the power of radar emission by the radiation power of reasonably controlling twice search.

Technical scheme: for achieving the above object, the technical solution used in the present invention is a kind ofly not have priori when guiding based on the stealthy search lighting Poewr control method of radio frequency, comprises following steps:

Step 1: behind the setting search to the expectation detection probability in each zone

Step 2: with 70% of radar maximum radiated power the zone of needs search tentatively searched for, determine to occur the ripple position of target;

Step 3: search is confirmed in the ripple position that target may occur, the radar emission power when determining to confirm search.

Beneficial effect: the present invention is when no priori guides, the radiation power during the design search lighting.The present invention can further improve the stealthy performance of radio frequency of radar when having better search performance.

Description of drawings

Fig. 1 is process flow diagram of the present invention.

Embodiment

Below in conjunction with the drawings and specific embodiments, further illustrate the present invention, should understand these embodiment only is used for explanation the present invention and is not used in and limits the scope of the invention, after having read the present invention, those skilled in the art all fall within the application's claims institute restricted portion to the modification of the various equivalent form of values of the present invention.

As shown in Figure 1, the specific embodiment of the invention is as follows:

1. according to the requirement of search mission, with the even subregion in region of search, and set the expectation detection probability in each zone

2. at first with 70% of radar maximum radiated power the zone of needs search tentatively searched for, determines to occur the ripple position of target:

(1) according to the echo signal to noise ratio snr of each ripple position _1iObtain corresponding detection probability P _D1i

P_{d 1 i} = p_{fa}^{1 / (1 + {SNR}_{1 i})}

Here p _FaBe false-alarm probability;

(2) as the P of certain ripple position _D1iGreater than P _D1TThe time, then being judged to be is the ripple position that target possible occur, P _D1TIt is predefined detection probability threshold values.

3. search is confirmed in the ripple position that target may occur:

1) binary search is carried out in the ripple position that target may occur, at first should determine the emissive power of these ripple positions.Here be that example illustrates with the ripple position i that target may occur, suppose that the preliminary searching and detecting probability at this place is P _D1iThen according to the expectation detection probability

Calculate the detection probability P that confirms that the search phase should accumulate _D2i, as shown in the formula:

P_{d 2 i} = 1 - (1 - P_{d}^{des}) / (1 - P_{d 1 i})

2) can obtain affirmation required signal to noise ratio snr of search phase _2i:

SNR _2i＝ln(p _fa)/ln(P _d2i)-1

3) according to radar equation, under the situation of known target distance, obtain radar secondary radiation power P _T2

P_{T 2} = \frac{{(4 π)}^{3} kT ({SNR}_{2 i}) {LR}^{4}}{G_{t} G_{r} λ^{2} σ}

In the formula, k is Boltzmann constant, G _rBe receiver gain, λ is wavelength, and σ is target RCS (Radar Cross section, RCS), and T and L are respectively effective noise temperature and radar system loss, and R is detection range (can be drawn by preliminary search guestimate), G _tBe the transmitting radar antenna gain.

Claims

1. one kind is not had priori when guiding based on the stealthy search lighting Poewr control method of radio frequency, it is characterized in that comprising following steps:

2. based on the stealthy search lighting Poewr control method of radio frequency, it is characterized in that described step 1 is carried out according to the following procedure when no priori according to claim 1 guides:

According to the requirement of search mission, with the even subregion in region of search, and set the expectation detection probability in each zone

3. based on the stealthy search lighting Poewr control method of radio frequency, it is characterized in that described step 2 is carried out according to the following procedure when no priori according to claim 1 guides:

P_{d 1 i} = p_{fa}^{1 / (1 + {SNR}_{1 i})}

Here p _FaBe false-alarm probability;

4. based on the stealthy search lighting Poewr control method of radio frequency, it is characterized in that described step 3 is carried out according to the following procedure when no priori according to claim 1 guides:

1) binary search is carried out in the ripple position that target may occur, calculate the emissive power of these ripple positions;

2) obtain affirmation required signal to noise ratio (S/N ratio) of search phase:

3) according to radar equation, obtain radar secondary radiation power.