CN107678002B - Method for efficiently measuring ground clutter improvement factor of MTD radar - Google Patents
Method for efficiently measuring ground clutter improvement factor of MTD radar Download PDFInfo
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- CN107678002B CN107678002B CN201710727139.XA CN201710727139A CN107678002B CN 107678002 B CN107678002 B CN 107678002B CN 201710727139 A CN201710727139 A CN 201710727139A CN 107678002 B CN107678002 B CN 107678002B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
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- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
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- Radar Systems Or Details Thereof (AREA)
Abstract
The invention relates to a method for measuring a high-efficiency ground clutter improvement factor of an MTD radar, which is characterized in that the improvement factor of a system is obtained by calculating the ratio of the channel signal power of a No. 0 filter to the output signal power of each non-zero channel and then solving the mean value. The method can realize real-time measurement of the improvement factor when the radar works normally, does not need special test equipment, and is simple and efficient.
Description
Technical Field
The invention belongs to the technical field of radar parameter measurement, and relates to a new method for measuring radar ground clutter improvement factors; the radar ground clutter improvement factor can be simply and effectively measured by the measuring method.
Background
Clutter environments faced by radars are complex, with ground clutter and motion clutter. The clutter resistance of the detection method is important for realizing the detection of the echo of the moving target in a complex clutter environment. At present, the radar mostly adopts MTD technology to suppress clutter. The main performance indexes for representing the anti-clutter performance of the radar when improving factors are defined as follows: the ratio of the signal clutter power ratio output by the radar signal processing system to the input signal clutter power ratio.
Generally, the measurement of radar improvement factors is complex, real moving targets and clutter backgrounds are needed during measurement, and the measurement is limited by external environment and test cost to a great extent. The traditional ground clutter improvement factor measurement method is also called analog target method, and the method requires the generation of an intermediate frequency part in a measured radar receiver to simulate a false target signal, and the signal synthesis is carried out on clutter received by a radar to generate a target signal and a clutter signal required by the radar MTD improvement factor measurement. In practical application, a simulation target device or a signal source is usually adopted to generate a simulation moving target echo, and a moving target signal is injected into a radar signal channel; then adjusting the frequency of the target to the required Doppler frequency, and adjusting the intensity to be consistent with the intensity of the clutter of the fixed ground object, namely keeping the input signal-to-clutter ratio to be 0 dB; at this time, the ground clutter improvement factor of the detected radar can be obtained only by measuring the signal-to-clutter ratio at the output end of the signal processor.
The above method has the following disadvantages:
a special test environment is required to be built by equipment such as a signal source and the like, and real-time monitoring on the improvement factor cannot be realized;
the method is used for measuring relative to fixed isolated ground clutter, the broadening characteristic of antenna scanning modulation on clutter spectrum is ignored, and certain errors exist in measured improvement factors.
Therefore, the invention provides an efficient MTD radar ground clutter improvement factor measuring method, which can realize real-time measurement of the improvement factor when the radar works normally, does not need special test equipment, and is simple and efficient.
Disclosure of Invention
Technical problem to be solved
In order to avoid the defects of the prior art, the invention provides a method for efficiently measuring ground clutter improvement factors of an MTD radar.
Technical scheme
A method for efficiently measuring ground clutter improvement factors of MTD radar is characterized by comprising the following steps:
step 1: detecting the normal startup of the radar;
step 2: selecting a detection unit with stable clutter residues at a radar terminal, and sending position information of the detection unit to a radar signal processor through a network;
and step 3: the radar signal processor outputs the MTD result of the detection unit, namely the amplitude output by each filter to a radar terminal;
and 4, step 4: the radar terminal calculates a ground clutter improvement factor of the radar according to the following formula and displays the value:
in the formula, P0dBFor the signal power output by the filter No. 0,
is the average of the signal power output by the non-zero filter channel.
Advantageous effects
The method for efficiently measuring the ground clutter improvement factor of the MTD radar has the following beneficial effects:
1. the test is simple, and the real-time measurement can be realized when the radar works normally;
2. the radar carries out ground clutter improvement factor measurement in the azimuth circumferential scanning process, and the measurement accuracy is high.
Detailed Description
The invention will now be further described with reference to the examples:
according to the definition of the improvement factor, the expression can be expressed as:
in the formula:
average power gain for the system to the target; pci/PcoThe clutter signals are attenuated after signal processing. In practical applications, the improvement factor is usually expressed in dB, and the expression is as follows:
in the formula (I), the compound is shown in the specification,
average power gain for the system to the target; CAdBThe clutter signals are attenuated after signal processing.
Because the present MTD filter design can ensure that the response difference to each doppler frequency is basically equivalent, and the difference is within 1dB, the power gain of a certain doppler frequency can be considered as the average power gain of the system to the target. In addition, because different filters have different responses near the zero frequency, the attenuation of clutter passing through different filters is also different. Therefore, the attenuation of clutter at each doppler frequency needs to be averaged when measuring the gain of the MTD radar system. Improvement factor meter of MTD radarThe calculation formula is as follows:
during MTD radar detection, if a certain detection unit does not have a target, when only the clutter of the ground object exists, in the MTD output result of the radar to this unit, the output of No. 0 filter channel is the echo signal of the clutter of the ground object, and its signal power is the sum of the input power of the clutter and the radar detection power gain, and the representation is: p0dB＝GdB+10lgPciAnd the signal power of other non-zero channels is the output power of the clutter after being suppressed by the MTD, and is expressed as: pndB＝10lgPco(n ≠ 0). Calculating the ratio of the channel signal power of the No. 0 filter to the output signal power of each non-zero channel, then calculating an average value, namely an improvement factor of the system, and after using dB to express, the calculation formula is as follows:
in the formula P0dBFor the signal power output by the filter No. 0,
is the average of the signal power output by the non-zero filter channel.
The method can be used for measuring the improvement factor by a signal processing unit and terminal software. The method comprises the steps that the radar is normally started to work, a detection unit with stable stronger clutter residues is selected on a PPI display interface of the radar, position information of the unit is sent to a signal processor, the signal processor carries out MTD processing on the detection unit, the maximum power output by each MTD filter channel is recorded, and then a formula (4) is used for calculating a ground clutter improvement factor of the radar.
Taking a pair of space information radars as an example, the radar signal processing stage sequentially completes pitching dimension DBF formation, digital pulse compression, MTD, threshold detection and angle measurement. Wherein the MTD processing is performed at 16-point MTD. The ground clutter improvement factor test method comprises the following steps:
a) detecting the normal startup of the radar;
b) clicking and selecting a detection unit with stable clutter residues at a radar terminal by using a mouse, and sending position information of the detection unit to a radar signal processor by the terminal through a network;
c) the radar signal processor outputs the MTD result (the amplitude output by each filter) of the detection unit to a radar terminal;
d) and the radar terminal calculates a ground clutter improvement factor of the radar according to a formula (4) and displays the value.
Claims (1)
1. A method for efficiently measuring ground clutter improvement factors of MTD radar is characterized by comprising the following steps:
step 1: detecting the normal startup of the radar;
step 2: selecting a detection unit with stable clutter residues at a radar terminal, and sending position information of the detection unit to a radar signal processor through a network;
and step 3: the radar signal processor outputs the MTD result of the detection unit, namely the amplitude output by each filter to a radar terminal;
and 4, step 4: the radar terminal calculates a ground clutter improvement factor of the radar according to the following formula, and displays the ground clutter improvement factor:
in the formula, P0dBFor the signal power output by the filter No. 0,
is the average of the signal power output by the non-zero filter channel.
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| CN107678002B true CN107678002B (en) | 2020-11-17 |
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Citations (3)
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| US4644356A (en) * | 1984-10-31 | 1987-02-17 | The United States Of America As Represented By The Secretary Of The Air Force | Bistatic coherent radar receiving system |
| CN102721947A (en) * | 2012-06-14 | 2012-10-10 | 河海大学 | Efficient three-dimensional space-time adaptive clutter suppression method for airborne digital array radar |
| CN106093888A (en) * | 2016-07-01 | 2016-11-09 | 西安电子科技大学 | Change notch width MTD filter design method based on prior information |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4644356A (en) * | 1984-10-31 | 1987-02-17 | The United States Of America As Represented By The Secretary Of The Air Force | Bistatic coherent radar receiving system |
| CN102721947A (en) * | 2012-06-14 | 2012-10-10 | 河海大学 | Efficient three-dimensional space-time adaptive clutter suppression method for airborne digital array radar |
| CN106093888A (en) * | 2016-07-01 | 2016-11-09 | 西安电子科技大学 | Change notch width MTD filter design method based on prior information |
Non-Patent Citations (4)
| Title |
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| RafałRytel-Andrianik.Design of MTD filters with maximal average improvement factor.《IEEE》.2014, * |
| 一种优化设计的动目标检测方法及其运用;胡可欣等;《火控雷达技术》;20070630;第20-23页 * |
| 对空情报雷达MTI改善因子测量方法研究;展文豪等;《测试技术学报》;20111231;第499-503页 * |
| 杂波背景下目标检测技术的研究;欧祥;《中国优秀硕士学位论文全文数据库 信息科技辑》;20130315;全文 * |
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