CN214750804U - Distance zero value calibration system for monopulse measurement radar - Google Patents
Distance zero value calibration system for monopulse measurement radar Download PDFInfo
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- CN214750804U CN214750804U CN202120515651.XU CN202120515651U CN214750804U CN 214750804 U CN214750804 U CN 214750804U CN 202120515651 U CN202120515651 U CN 202120515651U CN 214750804 U CN214750804 U CN 214750804U
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Abstract
The utility model provides a radar distance zero value of monopulse measurement is marked school system, including marking the school tower, the radar antenna of monopulse measurement radar aims at mark school tower transmission radar signal, marks the school tower and reflects formation echo signal or mark the school tower and receive radar signal back and generate echo signal to radar signal, and echo signal is received to the radar antenna of monopulse measurement radar. The distance calibration tower is not needed to be additionally erected, the distance calibration tower is organically combined with a traditional calibration tower, the calibration tower is not only responsible for calibrating the error, the directional sensitivity and the like of the monopulse radar shafting, but also responsible for calibrating the distance zero value, the construction cost and the expenditure are saved, the system structure is simplified, and meanwhile, the limitation that the working environment cannot independently establish the distance calibration is broken through. When the calibration tower receives the radar signal and then generates an echo signal, the echo signal and ground clutter have time difference, so that the calibration tower is convenient to distinguish, the distance zero value calibration precision is favorably improved, and the measurement error of the monopulse measurement radar is reduced.
Description
Technical Field
The utility model relates to a radar distance zero value calibration field, concretely relates to radar distance zero value calibration system is measured to monopulse.
Background
The calibration of the distance zero value of the monopulse radar is an effective technical means for ensuring the accuracy of the distance measurement value of the monopulse radar. At present, the distance zero value calibration mainly adopts the following method: a distance target is erected in advance, the true distance between a radar antenna and the distance target is obtained through geodetic measurement and serves as a true value, a monopulse radar is aligned with the distance target, the radar tracks the echo of the distance target to obtain a radar measured value between the radar and the distance target, and the radar measured value is subtracted from the true value of the distance to obtain a radar distance zero value.
The method mainly has the following problems: (1) distance marks need to be erected in advance, and certain expenditure is guaranteed; (2) under certain natural environments, the erection difficulty of the distance target is relatively large; (3) under some electromagnetic environment conditions, the range standard echo is influenced by a background environment and a multipath effect, the radar echo of a range standard angle reflector is unstable, ground clutter exists, the radar measurement value is inaccurate due to the interference of the ground clutter, the radar range zero-value precision is poor, and a large system error exists between the final measurement value and the true value of the radar. (4) In the prior art, a calibration tower is usually used for calibrating errors, directional sensitivity and the like of a monopulse radar shafting, a distance standard is used for calibrating a distance zero value, and the system is complex and resource integration is not performed.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects existing in the prior art, the utility model aims to provide a radar distance zero value calibration system is measured to monopulse.
In order to realize the utility model discloses an above-mentioned purpose, the utility model provides a monopulse measures radar distance zero value and marks school system, including marking the school tower, the radar antenna of monopulse measures the radar aligns mark school tower transmission radar signal, it is right to mark the school tower radar signal reflects formation echo signal perhaps mark the school tower and receive generate echo signal behind the radar signal, the radar antenna of monopulse measures the radar receives echo signal.
The scheme is as follows: the radar distance zero value calibration system does not need to additionally erect a distance standard, organically combines the distance standard with a traditional calibration tower, and the calibration tower is not only responsible for calibration of single pulse radar shafting errors, directional sensitivity and the like, but also responsible for calibration of distance zero values, saves construction cost and expenditure, simplifies the system structure, and breaks through the working environment and cannot independently establish the limitation of the distance standard. When the calibration tower receives the radar signal and then generates an echo signal, the echo signal and ground clutter have time difference, so that the calibration tower is convenient to distinguish, the calibration tower is favorable for improving the calibration precision of the distance zero value, and the measurement error of the monopulse measurement radar is reduced.
In a preferred embodiment of the present invention, when the calibration tower is right, the radar signal is reflected to form an echo signal, and a corner reflector facing the radar antenna is provided on the calibration tower.
The scheme is as follows: the angle reflector is used for reflecting the radar signal to form an echo signal and enabling the echo signal to propagate towards the radar antenna.
The utility model discloses an in an preferred embodiment, work as mark school tower is received when generating echo signal behind the radar signal, mark school tower and be provided with receiving horn, the transmission loudspeaker of transmission echo signal, the signal source of receiving radar signal, the input of receiving horn and signal source is through first high frequency line connection, the output and the transmission loudspeaker of signal source pass through the second high frequency line connection.
The scheme is as follows: the radar signal is received through receiving loudspeaker, first high frequency line transmission, there is a time delay in signal source processing and second high frequency line transmission, this time delay makes echo signal arrive radar antenna late than ground object clutter, and this time difference can preset and calculate in addition and obtain, make echo signal have fixed time delay, with echo signal and ground object clutter effective separation, guaranteed that echo signal does not receive the influence of ground object clutter, make it stable, be favorable to radar end discernment echo signal, improve the demarcation precision of radar distance zero value.
The utility model discloses an in a preferred embodiment, the signal source includes amplifier circuit, amplifier circuit's input is connected with receiving loudspeaker through first high frequency line, amplifier circuit's output passes through the second high frequency line and is connected with transmitting loudspeaker.
The scheme is as follows: the radar signal is amplified by the amplifying circuit to enhance the strength of the echo signal output by the transmitting horn, and the radar end is more beneficial to distinguishing the echo signal and ground clutter.
The utility model discloses an in a preferred embodiment, the signal source still includes the delay timer, amplifier circuit's output is connected with the input of delay unit, the output of delay unit passes through the second high frequency line and is connected with transmission loudspeaker.
The scheme is as follows: the time delay is prolonged through the delayer, the time difference of the echo signal and the ground clutter reaching the radar end is increased, the identification and detection of the echo signal are further facilitated, and the problems that the echo of the angle reflector of the traditional range mark is unstable and the error of the range zero calibration is large due to the influence of the environment and the multipath are solved.
In a preferred embodiment of the present invention, the signal source is located below the calibration tower.
The scheme is as follows: the installation and the line connection are convenient.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a layout diagram of a system for calibrating the distance zero value of a monopulse measurement radar according to a preferred embodiment of the present invention;
FIG. 2 is a block diagram of a calibration tower according to a preferred embodiment of the present invention;
FIG. 3 is a graph illustrating a time-varying echo curve of a conventional range finder;
FIG. 4 is a schematic diagram of the time-dependent calibration tower range echo in a preferred embodiment of the present invention;
fig. 5 is a schematic diagram of the distance zero calibration process in a preferred embodiment of the present invention.
Reference numerals:
1 a radar antenna; 2 calibrating a tower; 3, a transmitting horn; 4, receiving a horn; 5 high frequency lines.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, or may be connected between two elements through an intermediate medium, or may be directly connected or indirectly connected, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
The utility model discloses a radar distance zero value calibration system is measured to monopulse, in an preferred embodiment, as shown in figure 1, this system is including calibrating tower 2, and radar antenna 1 of monopulse measurement radar is aimed at calibrating tower 2 transmission radar signal, and calibrating tower 2 reflects formation echo signal or generates echo signal after calibrating tower 2 receives radar signal to radar signal, and echo signal is received to radar antenna 1 of monopulse measurement radar.
In the present embodiment, the echo signal may be formed by the calibration tower 2 reflecting the radar signal directly, or may be a non-reflected echo signal generated after the calibration tower 2 receives the radar signal.
In the present embodiment, when the echo signal is formed by directly reflecting the radar signal by the calibration tower 2, it is preferable that a corner reflector facing the radar antenna 1 is provided on the calibration tower 2, the corner reflector is used for reflecting the radar signal to form the echo signal and propagating the echo signal toward the radar antenna 1, and the corner reflector may be a hemispherical type or may be a corner reflector structure on a distance target.
In this embodiment, when echo signal is direct by the 2 reflection radar signal forms of calibration tower, the surface of preferred calibration tower 2 towards the monopulse measurement radar is equipped with the metal reflection stratum, and echo signal reflects the formation for the metal reflection stratum to radar signal, and the metal reflection stratum absorbs radar signal fewest, can reflect most echo signal, is favorable to strengthening echo signal, improves the discrimination of echo signal and ground object clutter, improves the distance zero value and marks the school precision.
In this embodiment, the monopulse measurement radar is usually provided with an analysis processing device, the analysis processing device is provided with distance zero value calibration software, the distance zero value calibration software performs detection processing of radar echo signals, tracking of reflected echoes and distance zero value calibration, and the distance zero value calibration software is the prior art, is not a protection point of the present application, and is not described herein again.
In a preferred embodiment, when the calibration tower 2 generates an echo signal after receiving a radar signal, as shown in fig. 1 and fig. 2, a receiving horn 4 for receiving the radar signal, a transmitting horn 3 for transmitting the echo signal, and a signal source are provided on the calibration tower 2, the receiving horn 4 is connected to an input end of the signal source through a first high frequency line, and an output end of the signal source is connected to the transmitting horn 3 through a second high frequency line.
In the present embodiment, the receiving horn 4 and the transmitting horn 3 are horn antennas that receive/transmit radar signals. Receiving horn 4 receives the radar signal and outputs the signal of telecommunication corresponding with the radar signal, and the signal source is exported to launching horn 3 after handling this signal of telecommunication and is sent and form echo signal, and echo signal is received by radar antenna 1 of radar end. The signal source preferably, but not limited to, filters and/or amplifies the electrical signal.
In the present embodiment, the first high-frequency line and the second high-frequency line are high-frequency signal lines, are connection lines for transmitting high-frequency signals, and may be shielded cables, for example, cables conforming to standard SJ 1563.
In the present embodiment, the signal source is preferably located below the calibration tower 2.
In a preferred embodiment, as shown in fig. 2, the signal source comprises an amplifying circuit, the input of which is connected to the receiving horn 4 via a first high frequency line and the output of which is connected to the transmitting horn 3 via a second high frequency line.
In this embodiment, the amplifying circuit is preferably, but not limited to, a radio frequency power amplifying circuit, and the radio frequency power amplifying circuit may adopt the prior art, such as a web site: the circuit structure disclosed in http:// www.elecfans.com/dianlutu/195/20180305643057.html is not described in detail herein.
In a preferred embodiment, as shown in fig. 2, the signal source further comprises a delay, the output terminal of the amplifying circuit is connected to the input terminal of the delay unit, and the output terminal of the delay unit is connected to the transmitting horn 3 through a second high frequency line.
In the embodiment, the amplifying circuit amplifies the electric signal output by the transmitting horn 3 and outputs the amplified electric signal to the delayer, the delayer delays the signal and outputs the delayed signal to the transmitting horn 3, and the delayer can select the existing product, such as a 20-channel digital delay signal generator with model number GFT1020 of Greenfield, france.
The utility model discloses an in the applied scene, mark the distance zero value to traditional distance and mark the school precision and test, certain model monopulse precision measurement radar antenna feed is 2751.83 meters to traditional actual distance apart from the mark. Due to the influence of the background and the natural environment, the echo of the traditional range finder shows wide-range deviation and fluctuation, and the change curve of the echo of the traditional range finder with time is shown in figure 3. As can be seen from fig. 3, the range echo of the conventional range finder has a large jump distance, the jump distance reaches 40 meters, the system error of the echo range deviates from the true value by about 11 meters, and the range zero value measured by the conventional range finder has a large influence on the range measurement value.
In the application scenario, the calibration source replaces a distance standard in the traditional sense, the real distance between the radar antenna feed source and the calibration tower loudspeaker is 611.27m, the processing delay distance of the measurement signal source to the pulse signal is 191.35m, the delay distance between the high-frequency line and the loudspeaker is 10.47, and the set working delay distance is 100000 m. The time variation curve of the echo distance of the radar pulse of the signal source is shown in figure 4.
In the application scenario, as can be seen from fig. 4, the range echo jump of the calibration source is very small, the jump distance is only 2 meters, the echo range system error only deviates from the true value by 0.1 meter, and the range zero value measured by using the calibration source pulse echo has almost no influence on the range measurement value. By comparing fig. 3 and 4, the present invention solves the problem of large distance zero error with conventional distance-measuring gauges.
In this application scenario, as shown in fig. 1, this novel survey through geodetic survey in advance the true distance between radar antenna feed source and the calibration tower loudspeaker be R1, and the time delay of survey high frequency line and loudspeaker is T2, then the distance that this time delay corresponds is:
where c is the speed of light, and c is 3 × 108m。
Similarly, the processing of the pulse signal by the signal source itself is delayed by a distance R3. In order to distinguish the signal source echo from the ground object echo, the signal source delay distance is set to R4 in advance. The monopulse radar transmits monopulse signals, the monopulse signals are received by the calibration source receiving horn and reach a calibration tower signal source through a high-frequency line, the signal source amplifies the pulse signals, and the amplified pulse signals reach the calibration source transmitting horn through the high-frequency line to be transmitted. The radar receives the echo signal of the calibration tower, carries out detection processing and tracking, and the distance zero value calibration software determines that the whole delay distance of the monopulse radar for transmitting and receiving a monopulse signal is R5, then the distance zero value of the monopulse measurement radar is:
R0＝R5-R4-R3-R2-R1；
the working process is shown in fig. 5, and specifically comprises the following steps:
firstly, a radar antenna is aligned with a calibration tower loudspeaker, and a single-pulse radar transmits a pulse signal through the antenna.
And secondly, receiving the pulse signal transmitted by the radar by a signal source receiving horn of the calibration tower.
And thirdly, amplifying and delaying the pulse signal transmitted by the radar by the calibration tower signal source.
And fourthly, the pulse signals processed by the calibration tower signal source transmit radar pulse signals through a calibration tower signal source transmitting loudspeaker.
And fifthly, receiving a radar pulse signal transmitted by a horn by the single-pulse radar through an antenna.
And sixthly, detecting, distance tracking and angle tracking the pulse echo signal by the monopulse radar, and measuring the echo delay distance of the radar.
And seventhly, tracking pulse echo signals emitted by a calibration tower signal source for a period of time by distance zero value calibration software, calculating an average value of distances, and then subtracting the distance between the radar and the calibration tower signal source horns, the delay distance between a high-frequency line and the horns, the processing delay distance of the signal source and the delay distance set by the signal source to obtain the distance zero value of the radar.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (6)
1. The utility model provides a monopulse measures radar distance zero value and marks school system which characterized in that, includes the calibration tower, the radar antenna of monopulse measures the radar aligns calibration tower transmission radar signal, the calibration tower is right radar signal reflects and forms echo signal or the calibration tower is received generate echo signal behind the radar signal, the radar antenna of monopulse measures the radar receives echo signal.
2. The monopulse measurement radar range null calibration system of claim 1, wherein when said calibration tower reflects said radar signal to form an echo signal, said calibration tower is provided with a corner reflector directed toward a radar antenna.
3. The monopulse measurement radar distance zero calibration system according to claim 1, wherein when the calibration tower generates an echo signal after receiving the radar signal, the calibration tower is provided with a receiving horn for receiving the radar signal, a transmitting horn for transmitting the echo signal, and a signal source, the receiving horn is connected with the input end of the signal source through a first high frequency line, and the output end of the signal source is connected with the transmitting horn through a second high frequency line.
4. The monopulse measurement radar range null calibration system of claim 3, wherein the signal source comprises an amplification circuit, an input terminal of the amplification circuit is connected to the receiving horn through a first high frequency line, and an output terminal of the amplification circuit is connected to the transmitting horn through a second high frequency line.
5. The monopulse measurement radar distance zero value calibration system according to claim 4, wherein the signal source further comprises a delay, an output terminal of the amplifying circuit is connected to an input terminal of the delay unit, and an output terminal of the delay unit is connected to the transmitting horn through a second high frequency line.
6. A monopulse measurement radar range zero calibration system as claimed in claim 3, 4 or 5, wherein said signal source is located below said calibration tower.
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| CN202120515651.XU CN214750804U (en) | 2021-03-11 | 2021-03-11 | Distance zero value calibration system for monopulse measurement radar |
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| CN202120515651.XU CN214750804U (en) | 2021-03-11 | 2021-03-11 | Distance zero value calibration system for monopulse measurement radar |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116224261A (en) * | 2023-05-08 | 2023-06-06 | 中国人民解放军63921部队 | Zero value calibration method for airborne large-caliber radar |
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2021
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116224261A (en) * | 2023-05-08 | 2023-06-06 | 中国人民解放军63921部队 | Zero value calibration method for airborne large-caliber radar |
| CN116224261B (en) * | 2023-05-08 | 2023-07-14 | 中国人民解放军63921部队 | Zero value calibration method for airborne large-caliber radar |
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Granted publication date: 20211116 |