CN102565770A - Reverse detection method for comprehensive receiving sensitivity of radar - Google Patents
Reverse detection method for comprehensive receiving sensitivity of radar Download PDFInfo
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- CN102565770A CN102565770A CN2012100127499A CN201210012749A CN102565770A CN 102565770 A CN102565770 A CN 102565770A CN 2012100127499 A CN2012100127499 A CN 2012100127499A CN 201210012749 A CN201210012749 A CN 201210012749A CN 102565770 A CN102565770 A CN 102565770A
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Abstract
The invention discloses a reverse detection method for comprehensive receiving sensitivity of radar. The method comprises the following steps: an analog echo signal source aims at a tested radar antenna (2) and radiates a microwave signal through an auxiliary horn antenna (1) in a mode of a maximum direction, and the frequencies of the analog echo signal source and the microwave signal are consistent; then, an adjustable attenuator is utilized to regulate the signal amplitude output by the signal source so that the signal can be normally displayed at a radar terminal, and the working frequency of the signal source is trimmed so that the output signal amplitude of a measured receiver is maximum; the adjustable attenuator is regulated so that an analog echo signal and a noise signal level are displayed at the radar terminal as 1:1, and at the moment the output power of the signal source is the comprehensive receiving sensitivity of radar. The method utilizes space electromagnetic wave radiation and adopts a mode of non-disintegration and non-contact to measure the comprehensive radiation power of the radar, so the capability of the radar to air radiation power is really reflected, and the overall system property on the whole transmission and radiation channel is better reflected. The method is suitable for detecting and estimating the transmitting power of radar in external fields and the field battle conditions.
Description
Technical field
The present invention relates to radar complete machine Performance Detection field, especially relate to the reverse detection method of the comprehensive receiving sensitivity of radar.
Background technology
Sensitivity is a very important technical indicator of radar receiver, and the reflection receiver receives the ability of feeble signal.The signal that receiver can receive is faint approximately, shows that the sensitivity of receiver is good more, and the operating distance of radar is just far away more.The sensitivity of radar receiver normally when the terminal device ability operate as normal of receiver, is represented with minimum induction electromotive force (Esmin) required on needed MDS power of receiver inlet (Psmin) or the antenna.The value of the Psmin sensitivity of the bright receiver of novel more is high more.The sensitivity of radar receiver at present generally can reach 10
-12W-10
-14W.The ultimate value of radar receiver sensitivity mainly is limited by the internal noise power of receiver.
In actual measurement, the sensitivity of receiver is divided into sensibility in practice usually and threshold sensitivity is measured.
So-called threshold sensitivity, when the signal power to noise power ratio that just is meant the output terminal (being the input end of wave detector) when the receiver linear segment is 1, the effective value E of signal electromotive force on the antenna
SminOr the rated power P of signal source
SminSo-called sensibility in practice just is meant when the signal power to noise power ratio of receiver output terminal is the necessary numerical value of normal reception the smallest effective value E of source EMF on the antenna
SminOr the rated power P of this signal source
Smin
According to the definition of sensitivity, the essence of measurement sensitivity is measured the MDS power P of microwave signal source emission exactly
SminBecause this power number magnitude is very little can't directly be measured with instrument and equipment, in practical application, sensitivity is minimum discernable power
P Smin Often show (as being 0dB with 1mW), promptly with dB numerical table with respect to a certain power
Have only the signal power that is input to receiver when antenna to reach
P 0Numerical value the time, receiver could normal receive and pick out signal, if signal is lower than this numerical value, this signal just can not be distinguished out.For general superhet radar receiver, the numerical value of sensitivity is 10
-12W～10
-14W, this power be equivalent to-90dB/mW～-110dB/mW is (promptly than the also low 90dB of 1mW～110dB).The test philosophy block scheme of receiver sensitivity is as shown in Figure 1.
The output power of microwave signal source among Fig. 1
P 0 Be known, the decay dB number of precision attenuator
ACan be by checking on the attenuator calibration curve.During test,, make the terminal part (when measuring sensibility in practice) of receiver or the identification coefficient of its linear segment (when surveying threshold sensitivity) output terminal through changing the damping capacity of attenuator
DWhen just being defined numerical value, at this moment be added in the signal power of receiver inlet
P Smin Be exactly the sensitivity of receiver.
Classic method usually need be decomposed the structure member of radar receiver input end so that the radar microwave signal can feed-in; The just receptivity of weighing of receiver linear segment (refer to threshold sensitivity measure) has perhaps been weighed the pulse repetition rate that comprises receiver linear segment, wave detector, the video amplifier, antenna lobe width and antenna direction, scanner rotating rate, radar, pulse width, the pattern of display, observer's skills involved in the labour or the like composite factor to receiving Effect on Performance (refer to sensibility in practice measure).
Summary of the invention
Technical matters to be solved by this invention is to propose the comprehensive receiving sensitivity method of testing of a kind of new radar, and the assessment radar complete machine performance that can prepare provides the inspection method of the comprehensive receiving sensitivity of a kind of radar.
For solving the problems of the technologies described above, the invention provides the reverse detection method of the comprehensive receiving sensitivity of a kind of radar, it is characterized in that: may further comprise the steps:
Step 1: auxiliary loudspeaker antenna (1) is passed through to tested radar antenna (2) microwave radiation signal in the analog echo signal source; The maximum direction of auxiliary loudspeaker antenna (1) radiation in said analog echo signal source is aimed at tested radar antenna (2); The polarised direction of two antennas is consistent, and the microwave frequency in said analog echo signal source is consistent with the radar frequency of operation;
Step 2: utilize the signal amplitude of adjustable attenuator conditioning signal source output, signal can normally be shown at radar terminal; And then the frequency of operation in fine adjustment signal source, make the amplitude output signal of tested receiver maximum;
Step 3: through regulating adjustable attenuator numerical value, make analog echo signal and noise signal level be shown as 1:1 at radar terminal, this moment, the signal source output power was the comprehensive receiving sensitivity of radar.
The output work calibration calibration of said microwave signal source is 0.9W ~ 1.1W.
The distance of said radiation electromagnetic horn and tested radar is 35 ~ 45 meters, and the radiation electromagnetic horn is overhead more than 5 meters.
The attenuator that the precision that said adjustable attenuator is selected for use is high, and its damping capacity is adjustable continuously.
Analog echo signal of the present invention source is demarcated distance through adjustable attenuator, test antenna in certain spatial and is injected microwave signal to the whole receiving cable radiant type of radar, through directly on the receiving terminal display device observation signal clutter carry out the test of receiving sensitivity than range value.This method belongs to sensibility in practice measurement category; But it need not disassemble radar arrangement; The receptivity that the sensibility in practice of weighing under classic method is measured, also embodied of the influence of factors such as radar spatial noise, antenna noise to the comprehensive receptivity of radar.
The present invention utilizes the space electromagenetic wave radiation; Adopt microwave signal source to tested radar antenna microwave radiation signal; Do not disintegrate, noncontact, the comprehensive receiving sensitivity of full tunnel formula instrumentation radar; The ability that can truly reflect the receiving target echo can better reflect the complete machine performance on the whole receiving cable, is fit under outfield and the field condition reverse detection of the comprehensive receiving sensitivity of radar and assessment.
Description of drawings
Fig. 1 is traditional Radar Receiver Sensitivity Measurement schematic diagram.
The reverse detection method schematic diagram of the comprehensive receiving sensitivity of Fig. 2 radar of the present invention.
Among the figure: 1, auxiliary loudspeaker antenna, 2, radar antenna, 3, radar truck.
Embodiment
Step 1: test is prepared, and auxiliary loudspeaker antenna 1 is passed through to tested radar antenna 2 microwave radiation signals in the analogue microwave signal source.
(1) sets up tested radar.It is smooth that tested radar should be erected at physical features, openr field on the ground, periphery do not have big barrier and reflecting body.Radar is in the reception duty.
(2) connect transmitter.Apart from about 40 meters of radar, the vertical antenna tower sets up reverse checkout equipment.Transmitter comprises microwave signal source, accurate adjustable attenuator, radiation electromagnetic horn, and through the microwave low-loss cable they is coupled together.Microwave signal source is through the tested radar antenna microwave radiation of auxiliary loudspeaker sky alignment signal; The output power of signal source is demarcated and is 1W; Microwave signal source power and frequency and attenuator damping capacity all should be adjustable continuously, to adapt to the needs to the test of variety classes radar antenna directional diagram.
For guaranteeing accurate test, equipment particularly signal source wants preheating about 30 minutes, guarantees that like this power and the frequency of output microwave signal is all highly stable.
The radiation electromagnetic horn overhead more than 5 meters, reduces the influence of ground return to greatest extent.
(3) radar antenna is aimed at.The maximum direction of microwave signal source radiation electromagnetic horn radiation must be aimed at tested radar antenna, and the polarised direction of antenna must be consistent with radar.At first through the gun sight on the radar antenna, radar antenna and radiation electromagnetic horn are aimed at, observed the radar terminal display then, the fine setting radar antenna makes the signal indication maximum.Guaranteed that the maximum direction of radiation electromagnetic horn radiation aims at tested radar antenna.
Step 2: regulate the signal amplitude of accurate adjustable attenuator conditioning signal source output, signal can normally be shown at radar terminal; And then the frequency of operation in fine adjustment signal source, make the amplitude output signal of tested receiver maximum.
(1) regulated attenuator.The regulated attenuator damping capacity can normally show its analog echo signal on the radar terminal display.
(2) microwave frequency of adjustment signal source makes it consistent with the radar frequency of operation.
Step 3:, make analog echo signal and noise signal level be shown as 1:1 at radar terminal through regulating accurate adjustable attenuator numerical value.This moment, the attenuator overall attenuation was the comprehensive receiving sensitivity of radar.
The present invention utilizes the electromagnetic wave space radiation, adopts microwave signal source, the comprehensive receiving sensitivity of accurate adjustable attenuator test radar.Because accurate adjustable attenuator test dynamic range is big, can directly detect the ability that the radar complete machine receives the microwave target echo signal, the process of the test debugging is simple, convenient, easy operating.
The present invention proposes a kind of new radar complete machine appraisal procedure; It is sensitivity measure to the full receiving cable of radar; It does not disintegrate, noncontact, the comprehensive receiving sensitivity of full tunnel instrumentation radar; The receptivity that the sensibility in practice of weighing under classic method is measured, also embodied of the influence of factors such as radar spatial noise, antenna noise, be fit under outfield and the field condition detection and assessment the radar receiving ability to the comprehensive receptivity of radar.
Though the present invention discloses as above with preferred embodiment; Right its is not in order to limit the present invention; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (4)
1. reverse detection method of the comprehensive receiving sensitivity of radar is characterized in that: may further comprise the steps:
Step 1: auxiliary loudspeaker antenna (1) is passed through to tested radar antenna (2) microwave radiation signal in the analog echo signal source; The maximum direction of auxiliary loudspeaker antenna (1) radiation in said analog echo signal source is aimed at tested radar antenna (2); The polarised direction of two antennas is consistent, and the microwave frequency in said analog echo signal source is consistent with the radar frequency of operation;
Step 2: utilize the signal amplitude of adjustable attenuator conditioning signal source output, signal can normally be shown at radar terminal; And then the frequency of operation in fine adjustment signal source, make the amplitude output signal of tested receiver maximum;
Step 3: through regulating adjustable attenuator numerical value, make analog echo signal and noise signal level be shown as 1:1 at radar terminal, this moment, the signal source output power was the comprehensive receiving sensitivity of radar.
2. the reverse detection method of the comprehensive receiving sensitivity of radar according to claim 1 is characterized in that: the output work calibration calibration of said microwave signal source is 0.9W ~ 1.1W.
3. the reverse detection method of the comprehensive receiving sensitivity of radar according to claim 1 is characterized in that: the distance of said radiation electromagnetic horn and tested radar is 35 ~ 45 meters, and the radiation electromagnetic horn is overhead more than 5 meters.
4. the reverse detection method of the comprehensive receiving sensitivity of radar according to claim 1 is characterized in that: the attenuator that the precision that said adjustable attenuator is selected for use is high, and its damping capacity is adjustable continuously.
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| CN2012100127499A CN102565770A (en) | 2012-01-16 | 2012-01-16 | Reverse detection method for comprehensive receiving sensitivity of radar |
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| CN2012100127499A CN102565770A (en) | 2012-01-16 | 2012-01-16 | Reverse detection method for comprehensive receiving sensitivity of radar |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107085204A (en) * | 2017-03-31 | 2017-08-22 | 西安电子工程研究所 | A kind of phased-array radar receives multichannel sensitivity test method |
| CN108008363A (en) * | 2016-10-27 | 2018-05-08 | 北京遥感设备研究所 | A kind of calibration system for quantitative measurment radar |
| CN109061584A (en) * | 2018-06-29 | 2018-12-21 | 北京无线电测量研究所 | The dynamic testing method and system of Radar Receiver System |
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| US3710381A (en) * | 1971-08-30 | 1973-01-09 | Singer Co | Signal-to-noise detector for non-stabilized doppler radar |
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| US3710381A (en) * | 1971-08-30 | 1973-01-09 | Singer Co | Signal-to-noise detector for non-stabilized doppler radar |
| CN1050094A (en) * | 1990-08-10 | 1991-03-20 | 中国人民解放军电子工程学院 | Covering jamming effect measuring instrument for radar |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108008363A (en) * | 2016-10-27 | 2018-05-08 | 北京遥感设备研究所 | A kind of calibration system for quantitative measurment radar |
| CN108008363B (en) * | 2016-10-27 | 2021-05-07 | 北京遥感设备研究所 | Calibration system for quantitative measurement radar |
| CN107085204A (en) * | 2017-03-31 | 2017-08-22 | 西安电子工程研究所 | A kind of phased-array radar receives multichannel sensitivity test method |
| CN107085204B (en) * | 2017-03-31 | 2019-10-01 | 西安电子工程研究所 | A kind of phased-array radar reception multichannel sensitivity test method |
| CN109061584A (en) * | 2018-06-29 | 2018-12-21 | 北京无线电测量研究所 | The dynamic testing method and system of Radar Receiver System |
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Application publication date: 20120711 |