CN102983415A - Transmit-receive antenna system for multi-point material level measurement radar - Google Patents
Transmit-receive antenna system for multi-point material level measurement radar Download PDFInfo
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Abstract
The invention relates to a transmit-receive antenna system for a multi-point material level measurement radar. A transmitting antenna is an individual antenna and used for transmitting a wide-beam electromagnetic signal, so that an electromagnetic wave can completely cover a measurement range. A transmitting signal is a wideband frequency modulation continuous wave signal. The electromagnetic wave forms an echo signal carrying material distance information after being reflected by a material surface, and the two-dimensional square array receiving antenna receives the echo signal. The receiving antenna adopts an array receiving form and controls each array element to conduct time-sharing gating by a feeder switch, only one array element completes signal receiving per cycle, and all the array elements share one receiving channel for time-sharing multiplexing. According to the system, as the receiving array elements are subjected to time-sharing gating and time-sharing receiving, and all the receiving array elements share one receiving channel, the hardware cost is lowered greatly, and the size of equipment is reduced.
Description
Technical field
The invention belongs to the Radar Antenna System field, be specifically related to a kind of dual-mode antenna system for thing position multimetering radar, is a kind of low-cost dual-mode antenna combination, can be applicable to multiple spot level gauging radar, realizes non-contact measurement.
Background technology
Some special industry needs to provide accurately aborning, reliably, thing position information efficiently, measuring object comprises solid, liquid, environment comprises the complex situations such as high temperature, high pressure, high vacuum, high viscosity, easily crystallization, deep-etching, severe toxicity, melting, dust suspension, measures comparatively difficulty.
Level gauging under the adverse circumstances, the most effective approach are to adopt contactless measurement, and what be applied in engineering reality mainly contains Ultrasonic Position-meter, isotope material level gauge, radar material level gauge.
More than various article position measuring methods all use the spot measurement technology, when carrying out the measurement of solid material, result of use is very undesirable, because the generally all out-of-flatnesses of the surface of tested material, be irregular fluctuating, drop between the highs and lows of material is larger, and spot measurement equipment can only be measured the single-point information of material, peak, minimum point that this point is its material actually, or its median, all can't determine, so certainty of measurement is relatively poor, can't satisfy the demand of practical application.
The precision of level gauging is provided, must exploitation multiple spot level gauging equipment.Each array element of traditional array reception antenna all has alone receive path, and all array elements receive signal simultaneously, but equipment amount is large, and cost is high.
Summary of the invention
The technical problem that solves
For fear of the deficiencies in the prior art part, the present invention proposes a kind of dual-mode antenna system for thing position multimetering radar, a kind of low-cost dual-mode antenna combination that can be used for realizing the radar material level gauge of multiple spot level gauging is provided, by transmission antennas transmit broad beam signal, the scope that the complete covering of electromagnetic wave is measured, with array received antenna reception echo-signal, can satisfy the requirement of multimetering.
Technical scheme
A kind of dual-mode antenna for thing position multimetering radar is characterized in that comprising transmitting antenna and transmission channel, n * n array received antenna, switch feeder network and receive path; Transmitting antenna and transmission channel are the unit of the independent emission broad beam electromagnetic signal that arranges, and the signal of launching is the linear frequency modulation continuous wave signal; All array elements of array received antenna share one road receive path, control each array element by the switch feeder network and carry out in order the timesharing gating, and each cycle only has an array element settling signal to receive.
Between transmitting antenna and array received antenna, be provided with wedge metal isolation strip 3, and at dual coating isolation absorbing material.
The wave band that transmits of described transmitting antenna is millimeter wave band.
The formation of described array received antenna is two-dimentional square array.
Described switch feeder network comprises n+1 feeder switch; Each row array adopts a feeder switch, and a front n feeder switch is implemented control to the array element of n capable array of n * n receiving antenna array respectively, and n+1 feeder switch controlled front n feeder switch, and controls being communicated with of receiving antenna array and receive path; Described front n feeder switch comprises m position TTL control level separately, all with the binary code of n m position corresponding to the numeral 0 ~ n-1 enable level as n array element in the capable array; Described n+1 feeder switch also comprises m position TTL control level, with the binary code of n m position corresponding to the numeral 0 ~ n-1 enable level as a front n feeder switch; Described m is for satisfying 2
mThe smallest positive integral of 〉=n.
Beneficial effect
A kind of dual-mode antenna system for thing position multimetering radar that the present invention proposes, transmitting antenna is individual antenna, emission broad beam electromagnetic signal makes the electromagnetic wave can complete covering measuring range.Transmit and be the wideband frequency modulation continuous wave signal.Electromagnetic wave forms the echo-signal of carrying the material range information behind the material surface reflection; Realize that by the square array received antenna of two dimension echo-signal receives.Reception antenna adopts the array received form, utilizes feeder switch to control each array element and carries out the timesharing gating, and each cycle only has an array element settling signal to receive.All array elements share one road receive path, time-sharing multiplex.
By carrying out the timesharing gating to receiving array element, timesharing receives among the present invention, makes all receive array element and shares one road receive path, greatly reduces hardware cost, is beneficial to simultaneously to reduce equipment volume.
Dual-mode antenna system for thing position multimetering radar of the present invention, can be applicable to multiple spot level gauging radar, realize non-contact measurement, can be operated under the complex environments such as high temperature, high pressure, high vacuum, high viscosity, lightweight powder, be specially adapted to monitor the divided solid materials that is stored in container or open space, applied environment and occasion are very extensive.
Description of drawings
Fig. 1 is middle emission of the present invention and reception antenna structural representation;
Fig. 2 is that the wave beam of transmitting antenna and reception antenna among the present invention covers schematic diagram;
Fig. 3 is feeder switch control level schematic diagram of the present invention;
Fig. 4 is feeder switch control structure schematic diagram among the present invention;
Fig. 5 is transmitted waveform and reception antenna array element switching sequence figure in the embodiment of the invention;
Fig. 6 is dual-mode antenna system and the slave part theory diagram of level radar in the embodiment of the invention;
The 1-transmitting antenna, 2-n * n array received antenna, 3-wedge metal isolation strip.
Embodiment
Now in conjunction with the embodiments, the invention will be further described for accompanying drawing:
With reference to Fig. 1 and Fig. 6, the dual-mode antenna combination mainly comprises: transmitting antenna, array received antenna, switch feeder network.Specifically be applied in the level radar, generally also should comprising the slave parts such as frequency synthesizer, signal processor.
With reference to Fig. 1 and Fig. 6, frequency synthesizer produces the sawtooth waveforms linear FM signal, and signal bandwidth is 600MHz, and centre frequency is 90GHz, and the signal repetition period is 2 milliseconds, delivers to transmitting antenna through transmission channel and launches; Frequency synthesizer provides the receive path mixing required local oscillation signal simultaneously.Signal processor mainly is responsible for echo-signal is processed.
With reference to Fig. 1, the form that adopts transmitting antenna 1 and reception antenna 2 to split in the present embodiment.Transmitting antenna is separate unit, and transmitted wave beamwidth (referring to Fig. 2) guarantees that the bank in the measuring range is all covered by signal, and transmitting is provided by frequency synthesizer.Reception antenna 2 is 8 * 8 array received antennas, and array element distance is 1.6 centimetres.Because there is the serious leakage phenomenon that transmits in continuous wave radar, the leakage signal of transmitting antenna 2 might cause the saturation of receiver; The leakage signal noise sideband of falling simultaneously in the receiver bandwidth can cause the receiver sensitivity to descend.Therefore to guarantee that the normal operation of system must improve receive-transmit isolation as much as possible.Present embodiment has increased wedge metal isolation strip 3 between dual-mode antenna on the basis of adopting double antenna, and apply the isolation absorbing material, to improve isolation between antennas.
Electromagnetic signal forms echo-signal after the material reflection, received by reception antenna.In the present embodiment, reception antenna adopts 8 * 8 array received forms, and the receive path of costliness is carried out time-sharing multiplex, make 64 array elements of receiving antenna array share one road receive path, to reduce cost, each array element is controlled by feeder switch, and its timesharing is linked to each other with receive path.
Referring to Fig. 1, with behavior unit, 64 array elements of receiving antenna array are divided into 8 groups.Every group of row array controlled by a feeder switch.Referring to Fig. 3, each feeder switch is controlled by 3 Transistor-Transistor Logic level (TTL0, TTL1, TTL2), realizes the switching controls to 8 unit, and for example control level is 000 o'clock, No. 1 one-cell switching, and control level is 001 o'clock, No. 2 one-cell switchings, the like.
Referring to Fig. 4,8 feeder switches that are numbered 1.～are 8. realized the independent of 8 groups of antenna rows arrays controlled, 9. number feeder switch link to each other with receive path, and implement control to front 8 feeder switches, same, control level is 000 o'clock, 1. number switching gate, control level is 001 o'clock, 2. number switching gate, the like.Select 8 feeder switches so comprise altogether 9 group 1, realize control, switching to 8 * 8 reception antenna array elements.The concrete control word of feeder switch sees Table 1.
Table 1 feeder switch control word
By as seen from Table 1, feeder switch H
0Control all the other 8 feeder line (H
1To H
8) gating, H
1To H
8Eight feeder switches control the gating of each self-corresponding eight array element, the final timesharing gating control that realizes 64 array elements.The gating control level can be provided by signal processor.
In order to guarantee the validity of time-sharing multiplex, must guarantee between the timesharing gating of the cycle emission (cycle is 2 milliseconds) of transmitting antenna and reception antenna array element synchronously.Referring to Fig. 5, arrive in emission trigger impulse forward position, transmission antennas transmit sawtooth linear frequency modulation continuous wave, and feeder switch makes a reception antenna array element gating simultaneously, and links to each other with receive path, realizes that the signal of this array element receives; After next trigger impulse arrives, again launch identical sawtooth linear frequency modulation continuous wave signal, and switch next reception antenna gating by feeder switch, realize that the signal of second array element receives.With behavior unit, order is switched during switching.Each cycle only has a reception antenna array element gating, and links to each other separately with receive path, and 64 all after dates are finished the complete reception of 8 * 8 receiving antenna arrays.
Receive because signal is carried out in each array element timesharing of reception antenna, so in receive path, sample and store echo-signal, be convenient to subsequent treatment.By time-sharing multiplex, saved 63 road receive paths, this will reduce the complexity of circuit greatly, be beneficial to the volume that reduces product, the economize on hardware cost.
After 64 array elements are all finished reception, by signal processor the reception signal of each array element of storage is processed, realized that the narrow beam of receiving antenna array receives (referring to Fig. 2), finally realize the multimetering of thing position.
Claims (5)
1. a dual-mode antenna system that is used for thing position multimetering radar is characterized in that comprising transmitting antenna and transmission channel, n * n array received antenna, switch feeder network and receive path; Transmitting antenna and transmission channel are the unit of the independent emission broad beam electromagnetic signal that arranges, and the signal of launching is the linear frequency modulation continuous wave signal; All array elements of array received antenna share one road receive path, control each array element by the switch feeder network and carry out in order the timesharing gating, and each cycle only has an array element settling signal to receive.
2. described dual-mode antenna system for thing position multimetering radar according to claim 1 is characterized in that: between transmitting antenna and array received antenna, be provided with wedge metal isolation strip 3, and at dual coating isolation absorbing material.
3. described dual-mode antenna system for thing position multimetering radar according to claim 1, it is characterized in that: the wave band that transmits of described transmitting antenna is millimeter wave band.
4. described dual-mode antenna system for thing position multimetering radar according to claim 1, it is characterized in that: the formation of described array received antenna is two-dimentional square array.
5. described dual-mode antenna system for thing position multimetering radar according to claim 1, it is characterized in that: described switch feeder network comprises n+1 feeder switch; Each row array adopts a feeder switch, and a front n feeder switch is implemented control to the array element of n capable array of n * n receiving antenna array respectively, and n+1 feeder switch controlled front n feeder switch, and controls being communicated with of receiving antenna array and receive path; Described front n feeder switch comprises m position TTL control level separately, all with the binary code of n m position corresponding to the numeral 0 ~ n-1 enable level as n array element in the capable array; Described n+1 feeder switch also comprises m position TTL control level, with the binary code of n m position corresponding to the numeral 0 ~ n-1 enable level as a front n feeder switch; Described m is for satisfying 2
mThe smallest positive integral of 〉=n.
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| CN104122555A (en) * | 2014-08-06 | 2014-10-29 | 上海无线电设备研究所 | Foresight view reinforcement device applied to low-altitude flight safety |
| CN104718436A (en) * | 2013-10-10 | 2015-06-17 | A.P.M.自动化解决方案公司 | A group of spaced apart acoustic transciver arrays and a method for measuring a content of a bin |
| CN105098382A (en) * | 2014-05-09 | 2015-11-25 | 启碁科技股份有限公司 | Radio frequency system |
| CN105403286A (en) * | 2015-12-21 | 2016-03-16 | 上海云鱼智能科技有限公司 | Electromagnetic wave node level indicator |
| KR20160120330A (en) * | 2014-02-11 | 2016-10-17 | 베가 그리이샤버 카게 | Determining a topology of the surface of a material filled into a container |
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| CN106164627A (en) * | 2014-05-02 | 2016-11-23 | Vega格里沙贝两合公司 | Determine by surface topology and the level gauging of center of rotation correction |
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| CN104122555A (en) * | 2014-08-06 | 2014-10-29 | 上海无线电设备研究所 | Foresight view reinforcement device applied to low-altitude flight safety |
| CN105403286A (en) * | 2015-12-21 | 2016-03-16 | 上海云鱼智能科技有限公司 | Electromagnetic wave node level indicator |
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| CN109632048A (en) * | 2017-10-06 | 2019-04-16 | Vega格里沙贝两合公司 | Radar level gauge with radar on-chip system |
| CN110501052A (en) * | 2018-05-17 | 2019-11-26 | Vega格里沙贝两合公司 | Fastening assembly for radar level measurement equipment |
| CN110501052B (en) * | 2018-05-17 | 2022-05-31 | Vega格里沙贝两合公司 | Fastening assembly for a radar level gauge |
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Application publication date: 20130320 |