CN103248384A - 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 the antenna measurement technical field, in particular a kind of antenna test method and system based on the wireless pulses technology.
Background technology
Present conventional main flow Antenna testing system all adopts the frequency domain test means to utilize tested antenna to receive pumping signal, frequency domain test does not possess the time-domain signal separating capacity, in continuous wave test, transmitting of the different moment may enter receiver at synchronization after different propagation paths time-delays, as shown in Figure 1, direct wave useful signal 7 and multipath interference signal 8 (building in the test environment, the direct wave of other target reflections such as support) enters receiver simultaneously after the stack, receiver can't be identified and distinguish signal 7 and 8, the actual reception of tested like this antenna processing signals can comprise interference component, cause the test result error, the multipath interference phenomenon in Here it is the antenna measurement.For suppressing the multipath interference signal, the antenna measurement technical staff has developed the time domain gate technique, the basic theories of its realization is that then transmission delay is also different for the electromagnetic wave transmission path difference, principle as shown in Figure 2, transmit 9 direct waves 10 that produce and multipath disturbing wave 11 separates at time shaft, 9 with the time delay of direct wave 10 time domain gate signal 12 is set and opens the time according to transmitting, the control receiver only receives direct wave signal 10, realizes effective inhibition that multipath disturbs.
The time domain gate technique can be realized by software and hardware respectively, wherein exemplary software time domain gate technique is realized as shown in Figure 3, its principle is that system at first carries out the swept continuous wave test, obtain amplitude and the phase data of frequency-region signal under certain frequency bandwidth, can obtain receiving the time domain data of signal by inverse Fourier transform, by software this time domain data being carried out windowed function again handles, with we wish that other data that obtain outside the data block on the time domain, only keep the data of software door inside.For software time domain gate technique, its time domain resolution only homologous ray frequency sweep bandwidth is inversely proportional to, and therefore can improve time domain resolution by increasing the frequency sweep bandwidth.
Exemplary hardware time domain gate technique is realized as shown in Figure 4, at 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 arrives test antenna through the space propagation delay, the test channel receiving key is under another road lock-out pulse control of same pulse generator output, only arrive period reception signal at the direct wave signal, other times turn-off receiver, realize only allowing useful signal pass through to suppress interference signal by control receiver make-and-break time, and then filtering multipath interference signal.
For software time domain gate technique, because what adopt is the artificial intercepting of the method realization time domain data of mathematical operation, the truncation effect of handling on this software will inevitably cause error, show that frequency domain is exactly gibbs (Gibbs) effect, this effect causes the fluctuation in passband and the stopband, has certain ripple exactly corresponding to window function in passband, and the attenuation characteristic in the stopband also is limited simultaneously, therefore software time domain door can be introduced test error in data are handled, and influences measuring accuracy.The realization basis of software time domain door is sweep check in addition, sweep check must guarantee the synchronous and control of the frequency sweep of transmiting signal source and receiver, for reaching the sweep check purpose, existing Antenna testing system generally adopts technical scheme shown in Figure 3, finish the system software controls of testing equipment by netting twine (or GPIB cable) 13 transmission control commands, it is synchronous to utilize the 10MHz frequency reference signal of radio frequency cable 14 transmission to finish the frequency reference of transceiver, the frequency alignment of transceiver during with the assurance test, utilize the start pulse signal of cable 15 transmission to realize that the hardware of transceiver triggers mutually, guarantee the synchronous with consistent of transceiver frequency step, it is wide that the hardware trigger technology realizes that frequency sweep has speed synchronously, the accuracy advantages of higher, also can pass through netting twine (or GPIB cable) and realize that the frequency sweep of transceiver is synchronous, shortcoming is that speed is slow.
For hardware time domain gate technique, it realizes that the basis is the transmitting-receiving test of pulse-modulated signal, hardware device need increase the multiplex pulse signal generator for this reason, equipment such as sampling switch, existing hardware gate function Antenna testing system generally adopts technical scheme shown in Figure 4, finish the system software controls of testing equipment by netting twine (or GPIB cable) 13 transmission control commands, it is synchronous to utilize the 10MHz frequency reference signal of radio frequency cable 14 transmission to finish the frequency reference of transceiver, the frequency alignment of transceiver during with the assurance test, the pulse modulation that the pulse signal realization that utilizes cable 16A to transmit transmits, utilize the break-make control of the lock-out pulse realization receive path gate controlled switch of cable 16B transmission, reach the purpose that receives direct wave inhibition disturbing wave.
By top analysis as seen, 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 the standard testing outfield, because the specificity of test site, there are not capital constructions such as other buildings or road in the place environment, cable wired connection mode is suitable under short reception and transmission range situation, but when measuring distance is far away, even site condition meets the demands, because signal of telecommunication transmission restriction and the restriction of construction implementation cost, the wired mode of cable also can not realize.For antenna measurement field, the particularly layout checkout area on city high rise building that does not satisfy the pattern field requirement, cable wired connection mode can not realize especially.
Therefore, there is defective in prior art, needs to improve.
Summary of the invention
Technical problem to be solved by this invention is at the deficiencies in the prior art, and a kind of antenna test method based on the wireless pulses technology and system are provided.
Technical scheme of the present invention is as follows:
A kind of Antenna testing system based on the 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, is used for the generation of driving pulse modulation signal; Described pulse-modulated signal receiving element is made up of pulse-modulated signal receiver, reception antenna, is used for the amplitude-phase information reception of pulse-modulated signal and the generation of multichannel synchronization pulse; Described wireless pulses Transmit-Receive Unit is made up of pulse modulation module, transmitting antenna, reception antenna, pulse detection and Shaping Module, is used for realizing that the pulsed base band signal is 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, is used for realizing the wireless transmission of system control command, finishes the automatic control of pulse-modulated signal transmitter unit; Described main control computer unit is used for realizing automatic control and the data processing of whole system; Described frequency reference unit is used to system's transmitting-receiving two-end equipment that the synchronizing frequency reference signal is provided.
Described Antenna testing system based on the wireless pulses technology, wherein, pulse modulation module internal signal generator operating frequency should be chosen in outside the system testing frequency range in the described wireless pulses Transmit-Receive Unit.
Described Antenna testing system based on the wireless pulses technology, wherein, described main control computer can connect the automatic control that wireless router is realized whole system by network interface; Described transmiting signal source receives control command by the USB wireless network card.
Described Antenna testing system based on the wireless pulses technology, wherein, described main control computer also can be realized the automatic control of whole system by the mode of bridge and network switch combination.
Described Antenna testing system based on the wireless pulses technology, wherein, the pulse-modulated signal transmitter unit is consistent with pulse-modulated signal receiving element operating frequency.
A kind of antenna test method based on the wireless pulses technology wherein, may further comprise the steps:
Step 17: start preheating;
Step 18: pulse parameter is determined, is used for selecting and parameters such as definite emission modulating baseband pulse duration, intermediate frequency gating pulse width, intermediate frequency gating pulse retardation, pulse period;
Step 19: system parameter setting is used for finishing the setting of system parameterss such as test frequency, signal source power, receiver intermediate-frequency bandwidth, pulse parameter;
Step 20: main control software control whole system is finished testing process automatically;
Step 21: test data storage, test antenna parameter are analyzed and are shown.
Described antenna test method based on the wireless pulses technology, wherein, the concrete following steps of carrying out of step 18:
Step 1801: determine space transmission delay t according to the dual-mode antenna distance R, t=R/C, wherein C is electromagnetic wave space transmission speed, generally gets 3 * 10
8M/s;
Step 1802: according to the pulse width parameter τ of system's dynamic range and test site interference profile choose reasonable emission modulating baseband pulse P3, under system's 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: select the definite pulsewidth τ of step 1802 as the pulse width parameter of intermediate frequency gating pulse P1, P2;
Step 1804: start Fig. 5 system it is under the frequency pulsed operation state, it is τ that the P3 pulsewidth is set, cycle is that (this value only is used for the pulse daley parameter and determines bigger numerical value, be the temporary value, under system's dynamic range enabled condition, get big value) as far as possible, it is τ that intermediate frequency gating pulse P1 pulsewidth is set, cycle is identical with P3, the relative P3 retardation of P1 is set to 2t+ Δ t1, Δ t1 is for greater than 0 numerical value (be that stepping amount successively increase with the pulse resolution), change different Δ t1, record receive path 1 shows numerical value, corresponding Δ t1 is transceiver channel 1 hardware delay amount when maximum occurring, so definite transceiver channel 1 intermediate frequency gate retardation 2t+ Δ t1 (equivalence is 2t+t among Fig. 8
p+ t
1), can determine that in like manner (equivalence is 2t+t among Fig. 8 to transceiver channel 2 intermediate frequency gate retardation 2t+ Δ t2
p+ t
2);
Step 1805: each road pulse period is set is T, and the period T value should be greater than pulsewidth τ and maximum impulse transmission delay (2t+t
p+ t
1, 2t+t
p+ t
2In big person) and, wherein t is the dual-mode antenna range delay, t
pBe wireless pulses Transmit-Receive Unit electric delay, t
2Be transceiver channel 2 hardware electric delays, t
1Transceiver channel 1 hardware electric delay.
Described antenna test method based on the wireless pulses technology, wherein, described step 1804 specific implementation and principle are:
Figure 10 shows that the realization block diagram of multichannel clock-pulse generator 214 among Fig. 5, utilize the flexibility of FPGA internal build counter and the height time-delay resolution characteristics of precision time delay unit, in conjunction with pulse shaper, can produce accurately controlled multiplex pulse baseband signal of cycle, pulsewidth and time-delay.In Figure 10, multichannel synchronization pulse generator comprises FPGA circuit 214A and two parts of external circuit 214B, FPGA circuit 214A partly finishes major functions such as the counting of pulsed base band signal cycle, pulsewidth and fine adjustment, and producing the pulsed base band signal, external circuit 214B mainly realizes the shaping processing of pulse edge 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 is output as pulse P0, for the intermediate frequency process module 213 of receiver 21 provides synchronised clock.FPGA internal pulses parameter and retardation arrange by the external control order, and the external control order requires to write according to Fig. 8 pulse sequence control relation.Wherein first counter 2142 is cycle rate counter, and the PRT that this counter is set according to the external control order produces periodic signal START, and this signal is as the enabling signal of back three tunnel pulses; According to pulse parameter requirement to the P3 pulse duration is set, second counter 2143 and first precise regulation circuit 2144 cooperatively interact, generation is that cycle, pulse duration satisfy the pulse modulation baseband signal of setting requirement with START, and is output as P3 through outside shaping circuit 2145; The 3rd counter 2146, second precise regulation circuit 2147, four- counter 2148 and 2149 common cooperations of the 3rd precise regulation circuit produce intermediate frequency gating pulse P1, wherein the 3rd counter 2146 and second precise regulation circuit 2147 are intermediate frequency gating pulse time-delay control section, four-counter 2148 and the 3rd precise regulation circuit 2149 are intermediate frequency gating pulse pulse duration control section, finally producing with periodic signal START is the cycle, with pulse P3 be same zero-time benchmark, pulse delay value and pulse duration satisfy sets the intermediate frequency gate-control signal that requires, and is output as pulse P1 through outside shaping circuit; It is the cycle that same mode produces with periodic signal START, with pulse P3 be same zero-time benchmark, the intermediate frequency gating pulse signal P2 that pulse delay value and pulse duration satisfy to set require.
Described antenna test method based on the wireless pulses technology, wherein, described P0 provides synchronised clock for intermediate frequency process modules A D sampling, P3 is output 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 benchmark postpones to export.
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 the test environment multipath and disturb, improve measuring accuracy;
(2) utilize wireless technology to realize the transmission of pulse signal, system building is not limited by the environment cable wiring manufacture, can be in non-standard outfields such as city, factories, and perhaps the hardware gate test function is realized in remote outfield.
(3) utilize Radio Transmission Technology to realize the automatic control of whole system, save human resources, improve testing efficiency.
(4) wireless clock reference module is introduced, and the emission of realization apart from each other and the frequency reference of receiving equipment are synchronous, guarantees that the precise frequency of transmitting-receiving two-end equipment is aimed at, and satisfies the receiver narrowband test to sending and receiving end frequency invariance requirement, improves system's dynamic range.
Description of drawings
Fig. 1 is that the antenna measurement multipath disturbs schematic diagram in the prior art;
Fig. 2 is that the time domain door is realized schematic diagram in the prior art;
Fig. 3 is software time domain gate antenna test schematic diagram in the prior art;
Fig. 4 is hardware time domain gate antenna test schematic diagram in the prior art;
Fig. 5 is Antenna testing system schematic diagram of the present invention;
Fig. 6 is wireless pulses Transmit-Receive Unit schematic diagram in the Antenna testing system of the present invention;
Fig. 7 is wireless communication unit schematic diagram in the Antenna testing system of the present invention;
Fig. 8 concerns schematic diagram for pulse sequence control in the method for testing of the present invention;
Fig. 9 is testing process schematic diagram in the method for testing of the present invention;
Figure 10 produces principle schematic for multichannel lock-out pulse in the method for testing of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
As Fig. 5-shown in Figure 7, the present invention propose based on the Antenna testing system of wireless pulses technology 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.
Pulse-modulated signal transmitter unit 1 is made up of transmiting signal source 11, pulse modulator 12, transmitting antenna 13, is used for the generation of driving pulse modulation signal.
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, the typical case is represented as AV3654 series of pulses vector network analyzer, the AV3655 series antenna and RCS tester of China Electronic Science and Technology Corporation development), reception antenna 22 (reference antenna, tested antenna) forms, the amplitude-phase information that is used for pulse-modulated signal receives and the generation of multichannel synchronization pulse.
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 that the pulsed base band signal is 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 generators 36 should be selected in outside the system testing frequency range.
Wireless communication unit 4, specifically as shown in Figure 7, interconnected and communication mutually by wireless transmitter module 44, transmitting antenna 43, reception antenna 42, wireless receiving module 41, be used for realizing the wireless transmission of system control command, finish the remote auto control of pulse-modulated signal transmitter unit.This equipment component can be selected off the shelf product for use, realizes as low-cost equipments such as wireless router, wireless network card, bridge, switches.
The automatic control of whole system is realized in main control computer unit (containing systems soft ware) 5.
Frequency reference unit 6 is used to transmitting-receiving two-end equipment that 10MHz synchronizing frequency reference signal is provided, and can select for use commercial gps clock base modules and gps antenna to realize.
As shown in Figure 4 the scheme main distinction is that the pulse signal transmission means is different with receive path hardware gate position in the present invention and the prior art, method of testing is as follows: under main control computer 5 controls, receiver 21 inner multichannel clock-pulse generators 214 produce 4 road pulse signal P0-P3, wherein P0 provides synchronised clock for intermediate frequency process modules A D sampling, P1-P3 along as original bench mark, can independently carry out transmission delay and pulse parameter setting with same clock respectively.The P3 pulse is output 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 benchmark postpones to export.Because dual-mode antenna transmission range and hardware device electric delay time are fixed, therefore can by pulse P1 is set, the P2 fixed delay time guarantees only at direct wave signal due in reception signal, realize pulse time domain door function, effectively suppress multipath and disturb, improve measuring accuracy.
Embodiment 2
On the basis of above-described embodiment, shown in Fig. 8-9, the invention provides a kind of antenna test method based on the wireless pulses technology, main method of testing flow process as shown in Figure 9, start preheating step 17 can be guaranteed the stability of signal source and receiver, is that the enough time is reserved in 6 lockings of frequency reference module simultaneously.Pulse parameter determining step 18 is finished emission modulating baseband pulse duration, intermediate frequency gating pulse width, pulse period, parameters such as each road pulse daley as shown in Figure 8.System parameter setting step 19 is finished 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 transmitting-receiving processing of main control software control system signal.After test is finished, carry out flow chart of data processing 21 such as data storage, antenna parameter analysis demonstration.
The multiplex pulse sequential control method is the key that the present invention realizes, be to finish the test necessary conditions, each main pulse parameter and sequencing control relation are as shown in Figure 8, at first determine transmission delay t according to dual-mode antenna (test is identical with antenna distance with antenna, burst transmissions) distance, the pulsewidth τ that pulse-modulated signal P3 is set is less than t, otherwise will cause the aliasing between direct wave and the transmitted wave; Secondly by the adjusting to reception intermediate frequency gate delay, in conjunction with the differentiation that intermediate frequency is received signal, definite propagation delay time that is caused by delays such as wireless pulses Transmit-Receive Unit, transceiver channel inside cable and hardware, the finally retardation of definite gating pulse and transmitted reference pulse; Each road pulse period T unanimity is set at last, and the period T value should be greater than pulsewidth τ and maximum impulse transmission delay (2t+t
p+ t
1, 2t+t
p+ t
2In big person) and, wherein t is that dual-mode antenna range delay, tp are that wireless pulses Transmit-Receive Unit electric delay, t2 are that transceiver channel 2 hardware electric delays, t1 are 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 the control command transmitter, controlled transmiting signal source receives control command by the USB wireless network card, when wireless router can't satisfy the transmission range requirement, when perhaps signal source does not possess USB wireless network card access capability, can realize the wireless transmission of control command by the mode of bridge and network switch combination.Intermediate frequency hardware time domain gate test requires operation of receiver under narrow intermediate-frequency bandwidth pattern, require accurately unanimity of transmitting-receiving two-end equipment operating frequency, the present invention provides the wireless solution of utilizing the gps clock base modules that high accuracy 10MHz reference clock is provided, emission source is connected the output of gps clock base modules respectively with receiver, can realize the high accuracy Frequency Synchronization under the satellite lock-out state.
On the basis of above-described embodiment, as Fig. 5-shown in Figure 7, the invention provides a kind of Antenna testing system based on the wireless pulses technology, formed by 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 transmiting signal source 11, pulse modulator 12, transmitting antenna 13, is used for the generation of driving pulse modulation signal; Described pulse-modulated signal receiving element 2 is by the pulse-modulated signal receiver 21 (equipment with pulse signal width of cloth phase measurement capability of configuration internal pulses generator, the typical case is represented as AV3654 series of pulses vector network analyzer, the AV3655 series antenna and RCS tester of China Electronic Science and Technology Corporation development), reception antenna 22 (reference antenna, tested antenna) forms, the amplitude-phase information that is used for pulse-modulated signal receives and the generation of multichannel synchronization pulse; 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, is used for realizing that the pulsed base band signal is by the wireless transmission of system receiving terminal to transmitting terminal; Described wireless communication unit 4, specifically as shown in Figure 7, formed by wireless transmitter module 44, transmitting antenna 43, reception antenna 42, wireless receiving module 41, be used for realizing the wireless transmission of system control command, finish the remote auto control of pulse-modulated signal transmitter unit; Described main control computer unit (containing systems soft ware) 5 is used for realizing the automatic control of whole system; Described frequency reference unit 6 is used to system's transmitting-receiving two-end equipment that 10MHz synchronizing frequency reference signal is provided, and can select for use commercial gps clock base modules and gps antenna to realize.Described Antenna testing system based on the wireless pulses technology, wherein, the operating frequency of pulse modulation module internal signal generator should be chosen in outside the system testing frequency range in the described wireless pulses Transmit-Receive Unit.
Further, described main control computer 5 can connect the automatic control that wireless router is realized whole system by network interface; Described transmiting signal source 11 receives control command by the USB wireless network card;
Further, described main control computer 5 also can be realized the automatic control of whole system by the mode of bridge and network switch combination.
Further, the operating frequency unanimity of pulse-modulated signal transmitter unit and pulse-modulated signal receiving element.
Embodiment 4
On the basis of above-described embodiment, as Fig. 8-shown in Figure 9, the invention provides a kind of antenna test method based on the wireless pulses technology, a kind of antenna test method based on the wireless pulses technology wherein, may further comprise the steps:
Step 17: start preheating;
Step 18: pulse parameter is determined, is used for selecting and parameters such as definite emission modulating baseband pulse duration, intermediate frequency gating pulse width, pulse period, intermediate frequency gating pulse retardation;
Step 19: system parameter setting is used for finishing the software setting of system parameterss such as test frequency, signal source power, receiver intermediate-frequency bandwidth, pulse parameter;
Step 20: main control software control whole system is finished test automatically;
Step 21: test data storage, test antenna parameter are analyzed and are shown.
Further, the concrete following steps of carrying out of step 18:
Step 1801: determine space transmission delay t according to the dual-mode antenna distance R, t=R/C, wherein C is electromagnetic wave space transmission speed, generally gets 3 * 10
8M/s;
Step 1802: according to the pulse width parameter τ of system's dynamic range and test site interference profile choose reasonable emission modulating baseband pulse P3, under system's 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: select the definite pulsewidth τ of step 1802 as the pulse width parameter of intermediate frequency gating pulse P1, P2;
Step 1804: Fig. 5 system is under the frequency pulsed operation state, it is τ that the P3 pulsewidth is set, cycle is that (this value only is used for the pulse daley parameter and determines bigger numerical value, be the temporary value, get big value) as far as possible, it is τ that intermediate frequency gating pulse P1 pulsewidth is set, cycle is identical with P3, the relative P3 retardation of P1 is set to 2t+ Δ t1, Δ t1 changes different Δ t1, record receive path 1 demonstration numerical value for greater than 0 numerical value (be that the stepping amount increase successively with the pulse resolution), corresponding Δ t1 is transceiver channel 1 hardware delay amount when maximum occurring, so definite transceiver channel 1 intermediate frequency gate retardation 2t+ Δ t1 (equivalence is 2t+t among Fig. 8
p+ t
1), in like manner, determine that (equivalence is 2t+t among Fig. 8 to transceiver channel 2 intermediate frequency gate retardation 2t+ Δ t2
p+ t
2);
Step 1805: each road pulse period unanimity is set, and the period T value should be greater than pulsewidth τ and maximum impulse transmission delay (2t+t
p+ t
1, 2t+t
p+ t
2In big person) and, wherein t is the dual-mode antenna range delay, tp is wireless pulses Transmit-Receive Unit electric delay, t
2Be transceiver channel 2 hardware electric delays, t
1Transceiver channel 1 hardware electric delay;
Further, described step 1804 implementation and principle are:
Figure 10 shows that the existing block diagram of realization of multichannel clock-pulse generator 214 among Fig. 5, utilize the flexibility of FPGA internal build counter and the height time-delay resolution characteristics of precision time delay unit, in conjunction with pulse shaper, can produce accurately controlled multiplex pulse baseband signal of cycle, pulsewidth and time-delay.In Figure 10, multichannel synchronization pulse generator comprises FPGA circuit 214A and two parts of external circuit 214B, FPGA circuit 214A partly finishes major functions such as the counting of pulsed base band signal cycle, pulsewidth and fine adjustment, and producing the pulsed base band signal, external circuit 214B mainly realizes the shaping processing of pulse edge 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 is output as pulse P0, for the intermediate frequency process module 213 of receiver 21 provides synchronised clock.FPGA internal pulses parameter and retardation arrange by the external control order, and the external control order requires to write according to Fig. 8 pulse sequence control relation.Wherein first counter 2142 is cycle rate counter, and the PRT that this counter is set according to the external control order produces periodic signal START, and this signal is as the enabling signal of back three tunnel pulses; According to pulse parameter requirement to the P3 pulse duration is set, second counter 2143 and first precise regulation circuit 2144 cooperatively interact, generation is that cycle, pulse duration satisfy the pulse modulation baseband signal of setting requirement with START, and through outside shaping circuit 2145 outputs; The 3rd counter 2146, second precise regulation circuit 2147, four-counter 2148 and 2149 common cooperations of the 3rd precise regulation circuit produce intermediate frequency gating pulse P1, wherein the 3rd counter 2146 and second precise regulation circuit 2147 are intermediate frequency gating pulse time-delay control section, four-counter 2148 and the 3rd precise regulation circuit 2149 are intermediate frequency gating pulse pulse duration control section, finally producing with periodic signal START is the cycle, with pulse P3 be same zero-time benchmark, pulse delay value and pulse duration satisfy sets the intermediate frequency gate-control signal that requires, and is output as pulse P1 through outside shaping circuit; It is the cycle that same mode produces with periodic signal START, with pulse P3 be same zero-time benchmark, the intermediate frequency gating pulse signal P2. that pulse delay value and pulse duration satisfy to set require
Further, described P0 is transmiting signal source pulse modulation baseband signal for intermediate frequency process modules A D sampling provides synchronised clock, P3, and P1, P2 are respectively as tested antenna receive path and reference antenna receive path intermediate frequency gating pulse with P3 after benchmark postpones to export.
Further, described step 20 is specially main control computer and connects wireless router by network interface, as the control command transmitter, controlled transmiting signal source receives control command by the USB wireless network card, (when wireless router can't satisfy the transmission range requirement, when perhaps signal source does not possess USB wireless network card access capability, can realize the wireless transmission of control command by the mode of bridge and network switch combination), receiver receives control command by netting twine, primary control program is platform with the main control computer, automatically finish test frequency by wired with wireless network, signal source power, receiver intermediate-frequency bandwidth, the setting of pulse parameter is by finishing the collection of test data to the automatic control of each equipment of system.Because intermediate frequency hardware time domain gate test requires operation of receiver under narrow intermediate-frequency bandwidth pattern, require accurately unanimity of transmitting-receiving two-end equipment operating frequency, the present invention provides the wireless solution of utilizing the gps clock base modules that high accuracy 10MHz reference clock is provided, emission source is connected the output of gps clock base modules respectively with receiver, can realize the high accuracy Frequency Synchronization under the satellite lock-out state.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection range of claims of the present invention.
Claims (9)
1. Antenna testing system based on the wireless pulses technology, it is characterized in that, 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, is used for the generation of driving pulse modulation signal; Described pulse-modulated signal receiving element is made up of pulse-modulated signal receiver, reception antenna, is used for the amplitude-phase information reception of pulse-modulated signal and the generation of multichannel synchronization pulse; Described wireless pulses Transmit-Receive Unit is made up of pulse modulation module, transmitting antenna, reception antenna, pulse detection and Shaping Module, is used for realizing that the pulsed base band signal is 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, is used for realizing the wireless transmission of system control command, finishes the automatic control of pulse signal transmitter unit; Described main control computer unit is used for realizing automatic control and the data processing of whole system; Described frequency reference unit is used to system's transmitting-receiving two-end equipment that the synchronizing frequency reference signal is provided.
2. the Antenna testing system based on the wireless pulses technology as claimed in claim 1 is characterized in that, the operating frequency of the signal generator of described pulse modulation module inside should be chosen in outside the system testing working frequency range.
3. the Antenna testing system based on the wireless pulses technology as claimed in claim 1 is characterized in that, described main control computer connects the automatic control that wireless router is realized whole system by network interface; Described transmiting signal source receives control command by the USB wireless network card.
4. the Antenna testing system based on the wireless pulses technology as claimed in claim 1 is characterized in that, described main control computer is realized the automatic control of whole system by the mode of bridge and network switch combination.
5. the Antenna testing system based on the wireless pulses technology as claimed in claim 1 is characterized in that, the pulse-modulated signal transmitter unit is consistent with pulse-modulated signal receiving element operating frequency.
6. the antenna test method based on the wireless pulses technology is characterized in that, may further comprise the steps:
Step 17: start preheating;
Step 18: pulse parameter is determined, is used for selecting and definite emission modulating baseband pulse duration, intermediate frequency gating pulse width, intermediate frequency gating pulse retardation and pulse period;
Step 19: system parameter setting is used for finishing the setting of system parameterss such as test frequency, signal source power, receiver intermediate-frequency bandwidth, pulse parameter;
Step 20: finish testing process;
Step 21: test data storage, test antenna parameter are analyzed and are shown.
7. the antenna test method based on the wireless pulses technology as claimed in claim 6 is characterized in that, the concrete following steps of carrying out of step 18:
Step 1801: determine space transmission delay t according to the dual-mode antenna distance R, t=R/C, wherein C is electromagnetic wave space transmission speed, generally gets 3 * 10
8M/s;
Step 1802: according to the pulse width parameter τ of system's dynamic range and test site interference profile choose reasonable emission modulating baseband pulse P3, under system's 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: select the definite pulsewidth τ of step 1802 as the pulse width parameter of intermediate frequency gating pulse P1, P2;
Step 1804: start-up system is under the frequency pulsed operation state it, it is τ that the P3 pulsewidth is set, cycle is greatest measure in the preset value, it is τ that intermediate frequency gating pulse P1 pulsewidth is set, cycle is identical with P3, the relative P3 retardation of P1 is set to 2t+ Δ t1, Δ t1 is the numerical value greater than 0, change different Δ t1, record receive path 1 shows numerical value, corresponding Δ t1 is transceiver channel 1 hardware delay amount when maximum occurring, and then definite transceiver channel 1 intermediate frequency gate retardation 2t+ Δ t1, in like manner can determine transceiver channel 2 intermediate frequency gate retardation 2t+ Δ t2;
Step 1805: each road pulse period is set is T, and the period T value should be greater than pulsewidth τ and maximum impulse transmission delay (2t+t
p+ t
1, 2t+t
p+ t
2In big person) and, wherein t is the dual-mode antenna range delay, t
pBe wireless pulses Transmit-Receive Unit electric delay, t
2Be transceiver channel 2 hardware electric delays, t
1Transceiver channel 1 hardware electric delay.
8. the antenna test method based on the wireless pulses technology as claimed in claim 7 is characterized in that, described step 1804 implementation is:
Utilize FPGA internal build counter and delay unit, in conjunction with pulse shaper, generation cycle, pulsewidth and the multiplex pulse baseband signal of delaying time controlled; Multichannel synchronization pulse generator comprises FPGA circuit and two parts of external circuit, the FPGA circuit part is finished counting and the adjustment process of pulsed base band signal cycle, pulsewidth, and producing the pulsed base band signal, external circuit is realized the shaping processing of pulse edge characteristic; Clock module produces the clock signal of 200MHz, is used to counter and regulating circuit that public reference clock is provided, and shaping simultaneously is output as pulse P0, for the intermediate frequency process module of receiver provides synchronised clock; FPGA internal pulses parameter and retardation arrange by the external control order, and the external control order arranges according to pulse sequence control relation; Wherein, first counter is cycle rate counter, and the PRT that this counter is set according to the external control order produces periodic signal START, and this signal is as the enabling signal of back three tunnel pulses; According to pulse parameter requirement to the P3 pulse duration is set, second counter and first regulating circuit cooperatively interact, and producing with START is that cycle, pulse duration satisfy and set the pulse modulation baseband signal that requires, and is output as P3 through outside shaping circuit; The 3rd counter, second regulating circuit, four-counter and the 3rd regulating circuit cooperate generation intermediate frequency gating pulse P1 jointly, wherein the 3rd counter and second regulating circuit are intermediate frequency gating pulse time-delay control section, four-counter and the 3rd regulating circuit are intermediate frequency gating pulse pulse duration control section, finally producing with periodic signal START is the cycle, with pulse P3 be same zero-time benchmark, pulse delay value and pulse duration satisfy sets the intermediate frequency gate-control signal that requires, and is output as pulse P1 through outside shaping circuit; It is the cycle that same mode produces with periodic signal START, with pulse P3 be same zero-time benchmark, the intermediate frequency gating pulse signal P2 that pulse delay value and pulse duration satisfy to set require.
9. the antenna test method based on the wireless pulses technology as claimed in claim 8, it is characterized in that, described P0 provides synchronised clock for intermediate frequency process modules A D sampling, and P3 is output as pulse P4 after the transmission of wireless pulses Transmit-Receive Unit, as transmiting signal source pulse modulation baseband signal; P1, P2 are that benchmark postpones after the output respectively the intermediate frequency gating pulse as tested antenna receive path and reference antenna receive path with P3.
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