CN103248384B - Antenna test method and antenna test system based on wireless pulse technology - Google Patents
Antenna test method and antenna test system based on wireless pulse technology Download PDFInfo
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Abstract
The invention provides an antenna test method and an antenna test system based on the wireless pulse technology. The system comprises a pulse-modulated signal transmission unit, a pulse-modulated signal receiving unit, a wireless pulse receiving and transmission unit, a wireless communication unit, a master control computer unit and a frequency reference unit; the pulse-modulated signal transmission unit is used for exciting the generation of pulse-modulated signals; the pulse-modulated signal receiving unit is used for receiving the amplitude and phase information of the pulse-modulated signals and generating synchronous pulse signals; the wireless pulse receiving and transmission unit is used for wirelessly transmitting baseband pulse signals; the wireless communication unit is used for wirelessly transmitting system control commands; the master control computer unit is used for automatically controlling the whole system and processing data; and the frequency reference unit is used for providing the receiving end device and the transmitting end device of the system with synchronous frequency reference signals.
Description
Technical field
The invention belongs to antenna measurement technical field, in particular a kind of antenna test method based on wireless pulses technology and system.
Background technology
Current conventional main flow Antenna testing system all adopts frequency domain test means to utilize tested antenna to receive pumping signal, frequency domain test does not possess time-domain signal separating capacity, in continuous wave test, not transmitting may enter receiver at synchronization after different propagation path time delay in the same time, as shown in Figure 1, direct wave useful signal 7 and multipath interference signal 8 (building in test environment, other targets such as support reflection direct wave) superposition after enter receiver simultaneously, receiver None-identified and differentiation signal 7 and 8, tested like this antenna actual reception processing signals can comprise interference component, cause test result error, multi-path jamming phenomenon in Here it is antenna measurement.For suppressing multipath interference signal, antenna measurement technical staff develops time domain gate technique, its basic theories realized is that then transmission delay is also different for electromagnetic wave transmission path difference, principle as shown in Figure 2, the direct wave 10 of 9 generations of transmitting is separated on a timeline with multipath disturbing wave 11, time delay according to transmit 9 and direct wave 10 arranges time domain gate signal 12 opening time, controls receiver and only receives direct-path signal 10, realize effective suppression of multi-path jamming.
Time domain gate technique can realize respectively by software restraint, wherein exemplary software time domain gate technique realizes as shown in Figure 3, its principle is that first system carries out swept continuous wave test, obtain amplitude and the phase data of frequency-region signal under certain frequency bandwidth, the time domain data of Received signal strength can be obtained by inverse Fourier transform, by software, windowed function process is carried out to this time domain data again, by in time domain, we wish that other data obtained outside data are blocked, and only retain the data of software door inside.For software time domain gate technique, its time resolution only homologous ray swept bandwidth is inversely proportional to, and therefore can improve time resolution by increasing swept bandwidth.
Exemplary hardware time domain gate technique realizes as shown in Figure 4, first signal source output continuous wave signal and pulse generator output pulse signal carry out pulse modulation, modulation signal is outwards launched through transmitting antenna, this signal delays to reach test antenna through spatial, under another road synchronized-pulse control that test channel receiving key exports at same pulse generator, only arrive period Received signal strength at direct-path signal, other times turn off receiver, realize only allowing useful signal pass through by control receiver make-and-break time and suppress interference signal, and then filtering multipath interference signal.
For software time domain gate technique, the artificial intercepting that the method for mathematical operation realizes time domain data due to what adopt, the truncation effect that this software processes will inevitably cause error, show that frequency domain is exactly gibbs (Gibbs) effect, this effect causes the fluctuation in passband and stopband, exactly there is in passband certain ripple corresponding to window function, attenuation characteristic simultaneously in stopband is also limited, therefore software time domain door can introduce test error in data handling, affects measuring accuracy.The optimized integration of software time domain door is sweep check in addition, sweep check must ensure the frequency sweep control and synchronization of transmiting signal source and receiver, for reaching sweep check object, existing Antenna testing system generally adopts technical scheme shown in Fig. 3, the system software controls that control command completes testing equipment is transmitted by netting twine (or GPIB cable) 13, the frequency reference that the 10MHz reference frequency signal utilizing radio frequency cable 14 to transmit completes transceiver is synchronous, the frequency alignment of transceiver during to ensure to test, the hardware utilizing start pulse signal that cable 15 transmits to realize transceiver triggers mutually, ensure the synchronous with consistent of transceiver frequency step, hardware trigger technology realizes frequency sweep, and synchronously to have speed wide, accuracy advantages of higher, also the frequency sweep of transceiver is realized by netting twine (or GPIB cable) synchronous, shortcoming is that speed is slow.
For hardware time domain gate technique, its optimized integration is the transmitting-receiving test of pulse-modulated signal, hardware device need increase multiplex pulse signal generator for this reason, the equipment such as sampling switch, existing hardware gate function Antenna testing system generally adopts technical scheme shown in Fig. 4, the system software controls that control command completes testing equipment is transmitted by netting twine (or GPIB cable) 13, the frequency reference that the 10MHz reference frequency signal utilizing radio frequency cable 14 to transmit completes transceiver is synchronous, the frequency alignment of transceiver during to ensure to test, the pulse signal utilizing cable 16A to transmit realizes the pulse modulation transmitted, the break-make that the lock-out pulse utilizing cable 16B to transmit realizes receive path gate controlled switch controls, reach the object receiving straight-wave restrain disturbing wave.
Visible by analysis above, no matter be software time domain door or hardware time domain door, existing implementation all be unable to do without the auxiliary of wire cable, for standard testing outfield, due to the specificity of test site, there is not other capital constructions such as building or road in space enrironment, cable wired connection mode is applicable in short reception and transmission range situation, but when measuring distance is far away, even if site condition meets the demands, because electric signal transmission restriction and construction implementation cost limit, cable wired mode also can not realize.For antenna measurement field, the particularly layout checkout area on city high rise building not meeting pattern field requirement, cable wired connection mode can not realize especially.
Therefore, prior art existing defects, needs to improve.
Summary of the invention
Technical problem to be solved by this invention is for the deficiencies in the prior art, provides a kind of antenna test method based on wireless pulses technology and system.
Technical scheme of the present invention is as follows:
Based on an Antenna testing system for wireless pulses technology, wherein, system is made up of pulse-modulated signal transmitter unit, pulse-modulated signal receiving element, wireless pulses Transmit-Receive Unit, wireless communication unit, main control computer unit, frequency reference unit; Described pulse-modulated signal transmitter unit, is made up of transmiting signal source, pulse modulator, transmitting antenna, for the generation of driving pulse modulation signal; Described pulse-modulated signal receiving element, is made up of pulse-modulated signal receiver, reception antenna, for the amplitude-phase receives information of pulse-modulated signal and the generation of Multi-path synchronous pulse signal; Described wireless pulses Transmit-Receive Unit, is made up of pulse modulation module, transmitting antenna, reception antenna, pulse detection and Shaping Module, for realizing pulsed base band signal by the wireless transmission of system receiving terminal to transmitting terminal; Described wireless communication unit, is made up of wireless transmitter module, transmitting antenna, reception antenna, wireless receiving module, for realizing the wireless transmission of system control command, completes the automatic control of pulse-modulated signal transmitter unit; Described main control computer unit, for realizing automatic control and the data processing of whole system; Described frequency reference unit, for providing synchronizing frequency reference signal for system transmitting-receiving two-end equipment.
The described Antenna testing system based on wireless pulses technology, wherein, in described wireless pulses Transmit-Receive Unit, pulse modulation module internal signal generator operating frequency should be selected outside system testing frequency range.
The described Antenna testing system based on wireless pulses technology, wherein, described main control computer connects by network interface the automatic control that wireless router realizes whole system; Described transmiting signal source receives control command by USB wireless network card.
The described Antenna testing system based on wireless pulses technology, wherein, the mode that described main control computer also combines by bridge and the network switch realizes the automatic control of whole system.
The described Antenna testing system based on wireless pulses technology, wherein, pulse-modulated signal transmitter unit is consistent with pulse-modulated signal receiving element operating frequency.
Based on an antenna test method for wireless pulses technology, wherein, comprise the following steps:
Step 17: start preheating;
Step 18: pulse parameter is determined, for selecting and determining to launch the parameters such as modulating baseband pulse duration, intermediate frequency gating pulse width, intermediate frequency gating pulse retardation, pulse period;
Step 19: system parameter setting, for completing the setting of the system parameterss such as test frequency, signal source power, receiver intermediate-frequency bandwidth, pulse parameter;
Step 20: main control software controls whole system and automatically completes testing process;
Step 21: test data storage, test antenna Parameter analysis and display.
The described antenna test method based on wireless pulses technology, wherein, step 18 specifically performs following steps:
Step 1801: determine that space propagation postpones t, t=R/C according to dual-mode antenna distance R, wherein C is electromagnetic wave space transmission speed, generally gets 3 × 10
8m/s;
Step 1802: the pulse width parameter τ launching modulating baseband pulse P3 according to Dynamic Range and test site interference profile choose reasonable, under Dynamic Range enabled condition, select narrow pulse broadband as far as possible, for avoiding signal aliasing, pulsewidth τ is less than the transmission delay t that step 1801 is determined;
Step 1803: the pulsewidth τ selecting step 1802 to determine is as the pulse width parameter of intermediate frequency gating pulse P1, P2;
Step 1804: under startup Fig. 5 system makes it be in a frequency pulsed operation state, arranging P3 pulsewidth is τ, cycle is that larger numerical value (only determine for pulse daley parameter by this value, for temporary value, take large values under Dynamic Range enabled condition) as far as possible, arranging intermediate frequency gating pulse P1 pulsewidth is τ, cycle is identical with P3, the relative P3 retardation of P1 is set to 2t+ Δ t1, Δ t1 be greater than 0 numerical value (being that stepping-in amount increases successively with pulse resolution), change different Δ t1, record receive path 1 shows numerical value, during appearance maximum, corresponding Δ t1 is transceiver channel 1 hardware delay amount, and then determine that transceiver channel 1 intermediate frequency gating delay amount 2t+ Δ t1 (is equivalent to 2t+t in Fig. 8
p+ t
1), in like manner can determine that transceiver channel 2 intermediate frequency gating delay amount 2t+ Δ t2 (is equivalent to 2t+t in Fig. 8
p+ t
2),
Step 1805: arranging each road pulse period is T, and cycle T value should be greater than pulsewidth τ and maximum impulse transmission delay (2t+t
p+ t
1, 2t+t
p+ t
2in large person) and, wherein t is dual-mode antenna range delay, t
pfor wireless pulses Transmit-Receive Unit electric delay, t
2for transceiver channel 2 hardware electric delay, t
1transceiver channel 1 hardware electric delay.
The described antenna test method based on wireless pulses technology, wherein, described step 1804 specific implementation and principle are:
What Figure 10 shows that Multi-path synchronous pulse generator 214 in Fig. 5 realizes block diagram, utilize the high delay resolution feature of the flexibility of FPGA internal build counter and precision time delay unit, in conjunction with pulse shaper, the multiplex pulse baseband signal of cycle, pulsewidth and time delay controllable precise can be produced.In Fig. 10, Multi-path synchronous pulse signal generator comprises FPGA circuit 214A and external circuit 214B two parts, FPGA circuit 214A part completes the major functions such as pulsed base band signal cycle, the counting of pulsewidth and fine adjustment, and producing pulsed base band signal, external circuit 214B mainly realizes the Shape correction of pulse along characteristic.Clock module 2141 produces the clock signal of 200MHz, and this signal provides public reference clock for all counters and precise regulation circuit, and shaping simultaneously exports as pulse P0, for the intermediate frequency process module 213 of receiver 21 provides synchronised clock.FPGA internal pulses parameter and retardation are by external control command set, and external control order requires to write according to Fig. 8 pulse sequence control planning.Wherein the first counter 2142 is cycle rate counter, and the PRT that this counter sets according to external control order produces periodic signal START, and this signal is as the enabling signal of three tunnel pulses below, according to pulse parameter, the requirement to P3 pulse duration is set, second counter 2143 and the first precise regulation circuit 2144 cooperatively interact, generation is the cycle with START, pulse duration meets the pulse modulation baseband signal that setting requires, and exports as P3 through outside shaping circuit 2145, 3rd counter 2146, second precise regulation circuit 2147, four-counter 2148 and the 3rd precise regulation circuit 2149 coordinate generation intermediate frequency gating pulse P1 jointly, wherein the 3rd counter 2146 and the second precise regulation circuit 2147 are intermediate frequency gating pulse delays time to control part, four-counter 2148 and the 3rd precise regulation circuit 2149 are intermediate frequency gating pulse pulse width control part, final generation with periodic signal START for the cycle, be same initial time benchmark with pulse P3, pulse delay value and pulse duration meet the intermediate frequency gate-control signal that setting requires, and export as pulse P1 through outside shaping circuit, same mode produces with periodic signal START for the cycle, is same initial time benchmark with pulse P3, and pulse delay value and pulse duration meet the intermediate frequency gate pulse signals P2 that setting requires.
The described antenna test method based on wireless pulses technology, wherein, described P0 provides synchronised clock for intermediate frequency process modules A D samples, P3 exports as pulse P4 after the transmission of wireless pulses Transmit-Receive Unit, as transmiting signal source pulse modulation baseband signal, P1, P2 are respectively as tested antenna receive path and reference antenna receive path intermediate frequency gating pulse with P3 after reference delay exports.
Adopt such scheme, can effectively improve antenna measurement precision and testing efficiency, concrete advantage is as follows:
(1) based on the hardware time domain gate technique of wireless pulses transmission, can effectively suppress test environment multi-path jamming, improve measuring accuracy;
(2) utilize wireless technology to realize the transmission of pulse signal, system building does not limit by environment cable wiring manufacture, can in the non-standard outfield such as city, factory, or remote outfield realizes hardware gate test function.
(3) utilize Radio Transmission Technology to realize the automatic control of whole system, save human resources, improve testing efficiency.
(4) Wireless clock base modules is introduced, the frequency reference realizing launching and receiving equipment apart from each other is synchronous, ensure that the precise frequency of transmitting-receiving two-end equipment is aimed at, meet receiver narrowband test to sending and receiving end frequency invariance requirement, improve Dynamic Range.
Accompanying drawing explanation
Fig. 1 is antenna measurement multi-path jamming schematic diagram in prior art;
Fig. 2 is that in prior art, time domain door realizes schematic diagram;
Fig. 3 is software time domain gate antenna test schematic diagram in prior art;
Fig. 4 is hardware time domain gate antenna test schematic diagram in prior art;
Fig. 5 is inventive antenna test macro schematic diagram;
Fig. 6 is wireless pulses Transmit-Receive Unit schematic diagram in inventive antenna test macro;
Fig. 7 is wireless communication unit schematic diagram in inventive antenna test macro;
Fig. 8 is pulse sequence control planning schematic diagram in method of testing of the present invention;
Fig. 9 is testing process schematic diagram in method of testing of the present invention;
Figure 10 is Multi-path synchronous pulses generation principle schematic in method of testing of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment 1
As shown in Figure 5-Figure 7, as shown in Figure 5, system is made up of pulse-modulated signal transmitter unit 1, pulse-modulated signal receiving element 2, wireless pulses Transmit-Receive Unit 3, wireless communication unit 4, main control computer unit (systems soft ware) 5, frequency reference unit 6 Antenna testing system based on wireless pulses technology that the present invention proposes.
Pulse-modulated signal transmitter unit 1 is made up of, for the generation of driving pulse modulation signal transmiting signal source 11, pulse modulator 12, transmitting antenna 13.
Pulse-modulated signal receiving element 2 is by the pulse-modulated signal receiver 21 (equipment with pulse amplitude phase measurement ability of configuration internal pulses generator, Typical Representative is AV3654 series of pulses vector network analyzer, AV3655 series antenna and the RCS tester of China Electronic Science and Technology Corporation's development), reception antenna 22 (reference antenna, tested antenna) forms, for the amplitude-phase receives information of pulse-modulated signal and the generation of Multi-path synchronous pulse signal.
Wireless pulses Transmit-Receive Unit 3, specifically as shown in Figure 6, is made up of pulse modulation module 34, transmitting antenna 33, reception antenna 32, pulse detection and Shaping Module 31, realizes pulsed base band signal by the wireless transmission of system receiving terminal to transmitting terminal.For avoiding this unit module wireless signal to the interference of Antenna testing system receiving and transmitting signal, the operating frequency of pulse modulation module 34 internal signal generator 36 should be selected in outside system testing frequency range.
Wireless communication unit 4, specifically as shown in Figure 7, be interconnected and communication mutually by wireless transmitter module 44, transmitting antenna 43, reception antenna 42, wireless receiving module 41, for realizing the wireless transmission of system control command, the remote auto completing pulse-modulated signal transmitter unit controls.This equipment component can select off the shelf product, as the low-cost equipments such as wireless router, wireless network card, bridge, switch realize.
Main control computer unit (containing systems soft ware) 5 realizes the automatic control of whole system.
Frequency reference unit 6, for providing 10MHz synchronizing frequency reference signal for transmitting-receiving two-end equipment, can select commercial gps clock base modules and gps antenna to realize.
From the scheme main distinction as shown in Figure 4 in prior art, the present invention is that pulse signal transmission mode is different with receive path hardware gate position, method of testing is as follows: under main control computer 5 controls, the inner Multi-path synchronous pulse generator 214 of receiver 21 produces 4 road pulse signal P0-P3, wherein P0 provides synchronised clock for intermediate frequency process modules A D samples, P1-P3, using same clock along as original bench mark, independently can carry out transmission delay and pulse parameter is arranged.P3 pulse exports as pulse P4 after the transmission of wireless pulses Transmit-Receive Unit, and as transmiting signal source pulse modulation baseband signal, P1, P2 are respectively as tested antenna receive path and reference antenna receive path intermediate frequency gating pulse with P3 after reference delay exports.Because dual-mode antenna transmission range and hardware device electric delay time are fixed, therefore ensure only at direct-path signal due in Received signal strength by arranging pulse P1, P2 fixed delay time, realize pulse temporal door function, effectively suppress multi-path jamming, improve measuring accuracy.
Embodiment 2
On the basis of above-described embodiment, as Figure 8-9, the invention provides a kind of antenna test method based on wireless pulses technology, main method of testing flow process as shown in Figure 9, start preheating step 17 can guarantee the stability of signal source and receiver, is that frequency reference module 6 locks reserved enough time simultaneously.Pulse parameter determining step 18 completes parameters such as launching modulating baseband pulse duration, intermediate frequency gating pulse width, pulse period, each road pulse daley as shown in Figure 8.System parameter setting step 19 completes the system parameter setting such as test frequency, signal source power, receiver intermediate-frequency bandwidth, pulse parameter.After starting test, the whole auto test flows 20 such as the transmitting-receiving process of main control software control system signal.After having tested, carry out the flow chart of data processing 21 such as data storage, antenna parameter analysis display.
Multiplex pulse sequential control method is the key that the present invention realizes, it has been the condition of test indispensability, each major pulses parameter and sequencing control relation are as shown in Figure 8, first transmission delay t is determined according to dual-mode antenna (test antenna, burst transmissions antenna distance are identical) distance, the pulsewidth τ arranging pulse-modulated signal P3 is less than t, otherwise will cause the aliasing between direct wave and transmitted wave; Secondly by the adjustment to reception intermediate frequency gate delay, in conjunction with the differentiation to received IF signal, determine to postpone by wireless pulses Transmit-Receive Unit, transceiver channel inside cable and hardware etc. the propagation delay time that causes, finally determine the retardation of gating pulse and transmitted reference pulse; Finally arrange each road pulse period T consistent, cycle T value should be greater than pulsewidth τ and maximum impulse transmission delay (2t+t
p+ t
1, 2t+t
p+ t
2in large person) and, wherein t is dual-mode antenna range delay, tp is wireless pulses Transmit-Receive Unit electric delay, t2 is transceiver channel 2 hardware electric delay, t1 is transceiver channel 1 hardware electric delay.
For realizing the automatic test of whole system under wireless status, the present invention provides the control method based on wireless communication unit, main control computer connects wireless router by network interface, as control command transmitter, controlled transmiting signal source receives control command by USB wireless network card, when wireless router cannot meet transmission range requirement, or when signal source does not possess USB wireless network card access capability, the mode combined by bridge and the network switch realizes the wireless transmission of control command.Intermediate frequency hardware time domain gate test requires that operation of receiver is under narrow intermediate-frequency bandwidth pattern, require that transmitting-receiving two-end equipment operating frequency must be accurately consistent, the present invention provides the wireless solution utilizing gps clock base modules to provide high accuracy 10MHz reference clock, emission source and receiver are connected gps clock base modules respectively and export, and can realize high accuracy Frequency Synchronization under satellite lock-out state.
Embodiment 3
On the basis of above-described embodiment, as shown in Figure 5-Figure 7, the invention provides a kind of Antenna testing system based on wireless pulses technology, be made up of pulse-modulated signal transmitter unit 1, pulse-modulated signal receiving element 2, wireless pulses Transmit-Receive Unit 3, wireless communication unit 4, main control computer unit (systems soft ware) 5, frequency reference unit 6; Described pulse-modulated signal transmitter unit 1 is made up of, for the generation of driving pulse modulation signal transmiting signal source 11, pulse modulator 12, transmitting antenna 13; Described pulse-modulated signal receiving element 2 is by the pulse-modulated signal receiver 21 (equipment with pulse signal width phase measurement capability of configuration internal pulses generator, Typical Representative is AV3654 series of pulses vector network analyzer, AV3655 series antenna and the RCS tester of China Electronic Science and Technology Corporation's development), reception antenna 22 (reference antenna, tested antenna) forms, for the amplitude-phase receives information of pulse-modulated signal and the generation of Multi-path synchronous pulse signal; Described wireless pulses Transmit-Receive Unit 3, specifically as shown in Figure 6, is made up of pulse modulation module 34, transmitting antenna 33, reception antenna 32, pulse detection and Shaping Module 31, for realizing pulsed base band signal by the wireless transmission of system receiving terminal to transmitting terminal; Described wireless communication unit 4, specifically as shown in Figure 7, be made up of wireless transmitter module 44, transmitting antenna 43, reception antenna 42, wireless receiving module 41, for realizing the wireless transmission of system control command, the remote auto completing pulse-modulated signal transmitter unit controls; Described main control computer unit (containing systems soft ware) 5 is for realizing the automatic control of whole system; Described frequency reference unit 6, for providing 10MHz synchronizing frequency reference signal for system transmitting-receiving two-end equipment, can select commercial gps clock base modules and gps antenna to realize.The described Antenna testing system based on wireless pulses technology, wherein, in described wireless pulses Transmit-Receive Unit, the operating frequency of pulse modulation module internal signal generator should be selected outside system testing frequency range.
Further, described main control computer 5 connects by network interface the automatic control that wireless router realizes whole system; Described transmiting signal source 11 receives control command by USB wireless network card;
Further, the mode that described main control computer 5 also combines by bridge and the network switch realizes the automatic control of whole system.
Further, the operating frequency of pulse-modulated signal transmitter unit and pulse-modulated signal receiving element is consistent.
Embodiment 4
On the basis of above-described embodiment, as illustrated in figs. 8-9, the invention provides a kind of antenna test method based on wireless pulses technology, a kind of antenna test method based on wireless pulses technology, wherein, comprises the following steps:
Step 17: start preheating;
Step 18: pulse parameter is determined, for selecting and determining to launch the parameters such as modulating baseband pulse duration, intermediate frequency gating pulse width, pulse period, intermediate frequency gating pulse retardation;
Step 19: system parameter setting, for completing the software design patterns of the system parameterss such as test frequency, signal source power, receiver intermediate-frequency bandwidth, pulse parameter;
Step 20: main control software controls whole system and automatically completes test;
Step 21: test data storage, test antenna Parameter analysis and display.
Further, step 18 specifically performs following steps:
Step 1801: determine that space propagation postpones t, t=R/C according to dual-mode antenna distance R, wherein C is electromagnetic wave space transmission speed, generally gets 3 × 10
8m/s;
Step 1802: the pulse width parameter τ launching modulating baseband pulse P3 according to Dynamic Range and test site interference profile choose reasonable, under Dynamic Range enabled condition, select narrow pulse broadband as far as possible, for avoiding signal aliasing, pulsewidth τ is less than the transmission delay t that step 1801 is determined;
Step 1803: the pulsewidth τ selecting step 1802 to determine is as the pulse width parameter of intermediate frequency gating pulse P1, P2;
Step 1804: under Fig. 5 system is in a frequency pulsed operation state, arranging P3 pulsewidth is τ, cycle is that larger numerical value (only determine for pulse daley parameter by this value, for temporary value, take large values) as far as possible, arranging intermediate frequency gating pulse P1 pulsewidth is τ, cycle is identical with P3, the relative P3 retardation of P1 is set to 2t+ Δ t1, Δ t1 be greater than 0 numerical value (being that stepping-in amount increases successively with pulse resolution), change different Δ t1, record receive path 1 shows numerical value, during appearance maximum, corresponding Δ t1 is transceiver channel 1 hardware delay amount, and then determine that transceiver channel 1 intermediate frequency gating delay amount 2t+ Δ t1 (is equivalent to 2t+t in Fig. 8
p+ t
1), in like manner, determine that transceiver channel 2 intermediate frequency gating delay amount 2t+ Δ t2 (is equivalent to 2t+t in Fig. 8
p+ t
2),
Step 1805: arrange each road pulse period consistent, cycle T value should be greater than pulsewidth τ and maximum impulse transmission delay (2t+t
p+ t
1, 2t+t
p+ t
2in large person) and, wherein t is dual-mode antenna range delay, and tp is wireless pulses Transmit-Receive Unit electric delay, t
2for transceiver channel 2 hardware electric delay, t
1transceiver channel 1 hardware electric delay;
Further, described step 1804 implementation and principle are:
Figure 10 shows that the existing block diagram of the realization of Multi-path synchronous pulse generator 214 in Fig. 5, utilize the high delay resolution feature of the flexibility of FPGA internal build counter and precision time delay unit, in conjunction with pulse shaper, the multiplex pulse baseband signal of cycle, pulsewidth and time delay controllable precise can be produced.In Fig. 10, Multi-path synchronous pulse signal generator comprises FPGA circuit 214A and external circuit 214B two parts, FPGA circuit 214A part completes the major functions such as pulsed base band signal cycle, the counting of pulsewidth and fine adjustment, and producing pulsed base band signal, external circuit 214B mainly realizes the Shape correction of pulse along characteristic.Clock module 2141 produces the clock signal of 200MHz, and this signal provides public reference clock for all counters and precise regulation circuit, and shaping simultaneously exports as pulse P0, for the intermediate frequency process module 213 of receiver 21 provides synchronised clock.FPGA internal pulses parameter and retardation are by external control command set, and external control order requires to write according to Fig. 8 pulse sequence control planning.Wherein the first counter 2142 is cycle rate counter, and the PRT that this counter sets according to external control order produces periodic signal START, and this signal is as the enabling signal of three tunnel pulses below, according to pulse parameter, the requirement to P3 pulse duration is set, second counter 2143 and the first precise regulation circuit 2144 cooperatively interact, generation is the cycle with START, pulse duration meets the pulse modulation baseband signal that setting requires, and exports through outside shaping circuit 2145, 3rd counter 2146, second precise regulation circuit 2147, four-counter 2148 and the 3rd precise regulation circuit 2149 coordinate generation intermediate frequency gating pulse P1 jointly, wherein the 3rd counter 2146 and the second precise regulation circuit 2147 are intermediate frequency gating pulse delays time to control part, four-counter 2148 and the 3rd precise regulation circuit 2149 are intermediate frequency gating pulse pulse width control part, final generation with periodic signal START for the cycle, be same initial time benchmark with pulse P3, pulse delay value and pulse duration meet the intermediate frequency gate-control signal that setting requires, and export as pulse P1 through outside shaping circuit, same mode produces with periodic signal START for the cycle, is same initial time benchmark with pulse P3, and pulse delay value and pulse duration meet the intermediate frequency gate pulse signals P2. that setting requires
Further, described P0 provides synchronised clock for intermediate frequency process modules A D samples, and P3 is transmiting signal source pulse modulation baseband signal, and P1, P2 are respectively as tested antenna receive path and reference antenna receive path intermediate frequency gating pulse with P3 after reference delay exports.
Further, described step 20 is specially main control computer and connects wireless router by network interface, as control command transmitter, controlled transmiting signal source receives control command by USB wireless network card, (when wireless router cannot meet transmission range requirement, or when signal source does not possess USB wireless network card access capability, the mode combined by bridge and the network switch realizes the wireless transmission of control command), receiver receives control command by netting twine, primary control program take main control computer as platform, automatically test frequency is completed with wireless network by wired, signal source power, receiver intermediate-frequency bandwidth, the setting of pulse parameter, by completing the collection of test data to the automatic control of each equipment of system.Because intermediate frequency hardware time domain gate test requires that operation of receiver is under narrow intermediate-frequency bandwidth pattern, require that transmitting-receiving two-end equipment operating frequency must be accurately consistent, the present invention provides the wireless solution utilizing gps clock base modules to provide high accuracy 10MHz reference clock, emission source and receiver are connected gps clock base modules respectively and export, and can realize high accuracy Frequency Synchronization under satellite lock-out state.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection range that all should belong to claims of the present invention.
Claims (8)
1. the Antenna testing system based on wireless pulses technology, it is characterized in that, be interconnected and communication by pulse-modulated signal transmitter unit, pulse-modulated signal receiving element, wireless pulses Transmit-Receive Unit, wireless communication unit, main control computer unit, frequency reference unit; Described pulse-modulated signal transmitter unit, is made up of transmiting signal source, pulse modulator, transmitting antenna, for the generation of driving pulse modulation signal; Described pulse-modulated signal receiving element, is made up of pulse-modulated signal receiver, reception antenna, for the amplitude-phase receives information of pulse-modulated signal and the generation of Multi-path synchronous pulse signal; Described wireless pulses Transmit-Receive Unit, is made up of pulse modulation module, transmitting antenna, reception antenna, pulse detection and Shaping Module, for realizing pulsed base band signal by the wireless transmission of system receiving terminal to transmitting terminal; Described wireless communication unit, is made up of wireless transmitter module, transmitting antenna, reception antenna, wireless receiving module, for realizing the wireless transmission of system control command, completes the automatic control of pulse signal transmitter unit; Described main control computer unit, for realizing automatic control and the data processing of whole system; Described frequency reference unit, for providing synchronizing frequency reference signal for system transmitting-receiving two-end equipment; Transmiting signal source is connected and communication with pulse modulator, and pulse modulator is connected and communication with transmitting antenna; Transmiting signal source is also connected and communication with frequency reference unit; Transmiting signal source is also connected and communication with wireless communication unit, for receiving the order that hosting computing unit sends; Pulse modulator is also connected and communication with Shaping Module with the pulse detection in wireless pulses Transmit-Receive Unit, the signal that in received pulse modulation signal receiving element, the Multi-path synchronous pulse generator of pulse-modulated signal receiver inside sends; After pulse-modulated signal transmitter unit receives to the reception antenna that the pulse-modulated signal of space radiation is pulse modulation signal receiving unit, pulse modulated signal receiver completes reception and is transferred to main control computer unit again, is received by main control computer; The pulse-modulated signal receiver of pulse-modulated signal receiving element is connected and communication with the pulse modulation module of wireless pulses Transmit-Receive Unit, and the Signal transmissions produced by the Multi-path synchronous pulse generator of the pulse-modulated signal receiver inside of pulse-modulated signal receiving element is to pulse-modulated signal transmitter unit; The pulse-modulated signal receiver of pulse-modulated signal receiving element is connected and communication with main control computer unit; The pulse modulation receiver of pulse-modulated signal receiving element is connected and communication with frequency reference unit; The wireless transmitter module of wireless communication unit inside is connected and communication with main control computer; The wireless receiving module of wireless communication unit inside is connected and communication with transmiting signal source.
2., as claimed in claim 1 based on the Antenna testing system of wireless pulses technology, it is characterized in that, the operating frequency of the signal generator of described pulse modulation module inside should be selected outside system testing working frequency range.
3. as claimed in claim 1 based on the Antenna testing system of wireless pulses technology, it is characterized in that, described main control computer connects by network interface the automatic control that wireless router realizes whole system; Described transmiting signal source receives control command by USB wireless network card.
4., as claimed in claim 1 based on the Antenna testing system of wireless pulses technology, it is characterized in that, described main control computer realizes the automatic control of whole system by the mode that bridge and the network switch combine.
5., as claimed in claim 1 based on the Antenna testing system of wireless pulses technology, it is characterized in that, pulse-modulated signal transmitter unit is consistent with pulse-modulated signal receiving element operating frequency.
6. the antenna test method of Antenna testing system as claimed in claim 1, is characterized in that, comprise the following steps:
Step 17: start preheating;
Step 18: pulse parameter is determined, for selecting and determining to launch modulating baseband pulse duration, intermediate frequency gating pulse width, intermediate frequency gating pulse retardation and pulse period;
Step 19: system parameter setting, for completing the setting of the system parameterss such as test frequency, signal source power, receiver intermediate-frequency bandwidth, pulse parameter;
Step 20: complete testing process;
Step 21: test data storage, test antenna Parameter analysis and display;
Described step 18 specifically performs following steps:
Step 1801: determine that space propagation postpones t, t=R/C according to dual-mode antenna distance R, wherein C is electromagnetic wave space transmission speed, generally gets 3 × 10
8m/s;
Step 1802: the pulse width parameter τ launching modulating baseband pulse P3 according to Dynamic Range and test site interference profile choose reasonable, under Dynamic Range enabled condition, select narrow pulse broadband as far as possible, for avoiding signal aliasing, pulsewidth τ is less than the transmission delay t that step 1801 is determined;
Step 1803: the pulsewidth τ selecting step 1802 to determine is as the pulse width parameter of intermediate frequency gating pulse P1, P2;
Step 1804: under start up system makes it be in a frequency pulsed operation state, arranging P3 pulsewidth is τ, cycle is greatest measure in preset value, arranging intermediate frequency gating pulse P1 pulsewidth is τ, cycle is identical with P3, the relative P3 retardation of P1 is set to 2t+ Δ t1, Δ t1 be greater than 0 numerical value, change different Δ t1, record receive path 1 shows numerical value, during appearance maximum, corresponding Δ t1 is transceiver channel 1 hardware delay amount, and then determines transceiver channel 1 intermediate frequency gating delay amount 2t+ Δ t1, in like manner can determine transceiver channel 2 intermediate frequency gating delay amount 2t+ Δ t2;
Step 1805: arranging each road pulse period is T, and cycle T value should be greater than pulsewidth τ and maximum impulse transmission delay (2t+t
p+ t
1, 2t+t
p+ t
2in large person) and, wherein t is dual-mode antenna range delay, t
pfor wireless pulses Transmit-Receive Unit electric delay, t
2for transceiver channel 2 hardware electric delay, t
1transceiver channel 1 hardware electric delay.
7., as claimed in claim 6 based on the antenna test method of wireless pulses technology, it is characterized in that, described step 1804 implementation is:
Utilize FPGA internal build counter and delay unit, in conjunction with pulse shaper, produce the multiplex pulse baseband signal that cycle, pulsewidth and time delay are controlled; Multi-path synchronous pulse signal generator comprises FPGA circuit and external circuit two parts, FPGA circuit part completes pulsed base band signal cycle, the counting of pulsewidth and adjustment process, and producing pulsed base band signal, external circuit realizes the Shape correction of pulse along characteristic; Clock module produces the clock signal of 200MHz, and for providing public reference clock for counter and regulating circuit, shaping simultaneously exports as pulse P0, and the intermediate frequency process module for receiver provides synchronised clock; FPGA internal pulses parameter and retardation are by external control command set, and external control order is arranged according to pulse sequence control planning; Wherein, the first counter is cycle rate counter, and the PRT that this counter sets according to external control order produces periodic signal START, and this signal is as the enabling signal of three tunnel pulses below; Arrange the requirement to P3 pulse duration according to pulse parameter, the second counter and the first regulating circuit cooperatively interact, and to produce with START be the cycle, pulse duration meets the pulse modulation baseband signal that setting requires, and export as P3 through outside shaping circuit; 3rd counter, the second regulating circuit, four-counter and the 3rd regulating circuit coordinate generation intermediate frequency gating pulse P1 jointly, wherein the 3rd counter and the second regulating circuit are intermediate frequency gating pulse delays time to control part, four-counter and the 3rd regulating circuit are intermediate frequency gating pulse pulse width control part, final generation with periodic signal START for the cycle, be same initial time benchmark with pulse P3, pulse delay value and pulse duration meet the intermediate frequency gate-control signal that setting requires, and export as pulse P1 through outside shaping circuit; Same mode produces with periodic signal START for the cycle, is same initial time benchmark with pulse P3, and pulse delay value and pulse duration meet the intermediate frequency gate pulse signals P2 that setting requires.
8. as claimed in claim 7 based on the antenna test method of wireless pulses technology, it is characterized in that, described P0 provides synchronised clock for intermediate frequency process modules A D samples, and P3 exports as pulse P4, as transmiting signal source pulse modulation baseband signal after the transmission of wireless pulses Transmit-Receive Unit; P1, P2 take P3 as the intermediate frequency gating pulse respectively as tested antenna receive path and reference antenna receive path after reference delay exports.
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| CN103986538A (en) * | 2014-06-03 | 2014-08-13 | 上海航天电子通讯设备研究所 | X-frequency-band noise coefficient automatic test system and method with LAN interface |
| CN105548978B (en) * | 2015-12-16 | 2017-10-03 | 中国电子科技集团公司第四十一研究所 | A kind of phased array antenna active refelction coefficient test system and method |
| WO2018053853A1 (en) * | 2016-09-26 | 2018-03-29 | 深圳市大疆创新科技有限公司 | Control method, control device, electronic device, and aerial vehicle control system |
| CN109425789A (en) * | 2017-08-24 | 2019-03-05 | 中航贵州飞机有限责任公司 | A kind of aircraft airborne antenna measurement device |
| CN110071851B (en) * | 2019-04-19 | 2022-01-25 | 成都飞机工业（集团）有限责任公司 | System and method for measuring flight test data delay |
| CN111711498B (en) * | 2020-08-07 | 2022-03-01 | 中电科航空电子有限公司 | Active antenna's anti-interference performance testing arrangement and system |
| CN112014651B (en) * | 2020-09-03 | 2023-05-16 | 上海无线电设备研究所 | Test method and test system of variable-frequency multi-channel phased array antenna |
| CN112665508B (en) * | 2020-12-08 | 2022-05-27 | 湖北工业大学 | Frequency domain signal reflectometer based on digital signal processing |
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