CN113126049A - Sensitivity measuring equipment and method applied to ultra-wideband sampling receiver - Google Patents
Sensitivity measuring equipment and method applied to ultra-wideband sampling receiver Download PDFInfo
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- CN113126049A CN113126049A CN202110669082.9A CN202110669082A CN113126049A CN 113126049 A CN113126049 A CN 113126049A CN 202110669082 A CN202110669082 A CN 202110669082A CN 113126049 A CN113126049 A CN 113126049A
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- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4004—Means for monitoring or calibrating of parts of a radar system
- G01S7/4021—Means for monitoring or calibrating of parts of a radar system of receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B17/20—Monitoring; Testing of receivers
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Abstract
The invention provides a sensitivity measuring device and method applied to an ultra-wideband sampling receiver, wherein the device comprises: the display device comprises a display unit, a control and processor, a first frequency-adjustable constant-temperature crystal oscillator, a second frequency-adjustable constant-temperature crystal oscillator, a frequency difference detection circuit, an emission time sequence forming circuit, an ultra-wideband signal generating circuit, a frequency band controller, an amplitude controller, a first AD acquisition circuit and a second AD acquisition circuit, and the method comprises the following steps: s1, respectively generating two paths of square waves by using a frequency-adjustable constant-temperature crystal oscillator; s2, directly transmitting one path of square wave signal to a tested receiver, and transmitting the other path of square wave signal serving as a time reference to the tested receiver after processing; and S3, outputting the intermediate frequency signal by the tested receiver, and when the signal to noise ratio reaches 1:1, determining the amplitude of the current injected ultra-wideband impulse as the sensitivity value of the tested receiver. The invention solves the problem of sensitivity measurement of the ultra-wideband sampling receiver and has the advantages of simple operation and low cost.
Description
Technical Field
The invention relates to the field of ultra-wideband (ultra-wideband) impulse system radar performance measurement, and particularly provides sensitivity measurement equipment and a method applied to an ultra-wideband sampling receiver.
Background
The sensitivity represents the capability of a receiver to receive weak signals, and is an important technical index of radio equipment such as radars, detectors and the like. The higher the sensitivity of the receiver is, the weaker the signal which can be received is, and the longer the action distance of the radar is. The sensitivity of a radar receiver is typically expressed in terms of the minimum detectable signal power, which is defined as:
whereinkIs the boltzmann constant, and is,T 0in the case of an absolute temperature,B 0for the instantaneous bandwidth of the receiver,F 0as the noise figure of the receiver, S0/N0The minimum signal-to-noise ratio required for signal identification at the receiver output.
The conventional radar receiver is provided with a frequency mixing local oscillator, so that the sensitivity test can be completed only by injecting a continuous wave or pulse signal with the same frequency and adjustable power. The ultra-wideband sampling receiver is different from a conventional radar receiver, the sensitivity test of the ultra-wideband sampling receiver needs to inject an ultra-wideband pulse signal and also needs to provide a sampling clock with continuous sliding relative to the injected signal, and the sensitivity measurement result is directly related to the relative sliding speed of a sampling pulse.
At present, a general microwave signal source cannot generate nanosecond or even picosecond-order extremely narrow pulses, the cost of customizing and developing the signal source is high, amplitude, frequency band and time domain waveforms cannot be controlled, the pertinence is poor, and meanwhile, a sampling clock which continuously slides relative to injected ultra-wideband impulse pulses is generated, and the problem is difficult to solve. Therefore, the existing ultra-wideband sampling receiver test usually needs multiple devices and self-research module cooperation, a complex test system is built, the universality is poor, and the cost and the realization difficulty are high.
Disclosure of Invention
The problems solved by the invention are as follows: at present, the test of the ultra-wideband sampling receiver usually needs a plurality of devices and self-research module matching, a complex test system is built, the universality is poor, and the cost and the realization difficulty are very high.
The invention provides a sensitivity measuring device applied to an ultra-wideband sampling receiver, which comprises:
a display unit for displaying the measurement result and adjusting the control device, the display unit adopts a touch display screen to realize human-computer interaction,
as a control and processor of the equipment dispatching center, the control and processor is realized by adopting a high-performance embedded processor, the control and processor is electrically connected with the display unit,
a first frequency-adjustable constant-temperature crystal oscillator used for generating a sliding sampling clock and transmitting the sliding sampling clock to a receiver to be tested,
a second frequency-tunable constant temperature crystal oscillator for generating a reference clock,
is used for acquiring the frequency difference detection of the frequency difference signals of the first frequency adjustable constant temperature crystal oscillator and the second frequency adjustable constant temperature crystal oscillator,
a transmitting time sequence forming circuit for generating original ultra-wideband impulse pulse, the transmitting time sequence forming circuit receives the reference clock output by the second frequency adjustable constant temperature crystal oscillator,
an ultra-wideband signal generating circuit for generating a controllable primary ultra-wideband impulse, the ultra-wideband signal generating circuit receiving a transmit timing signal output by the transmit timing forming circuit,
a band controller for controlling the pulse width, frequency spectrum distribution and time domain waveform of the transmitted ultra-wideband pulse to make the ultra-wideband pulse meet the test requirement of the receiver in both time domain and frequency domain, the band controller is realized by LTCC low temperature co-fired ceramic filter, the band controller receives the primary ultra-wideband pulse output by the ultra-wideband signal generating circuit,
an amplitude controller for controlling the attenuation of the amplitude of the injected signal and transmitting the signal to the receiver to be tested, wherein the amplitude controller is realized by adopting a broadband integrated chip attenuator, a control and processor controls the attenuation of the amplitude controller through an SPI bus, the amplitude controller receives the transmitted ultra-wideband pulse output by a frequency band controller,
a first AD acquisition circuit for receiving the intermediate frequency echo transmitted back by the tested receiver and converting the intermediate frequency echo into a digital signal,
a second AD acquisition circuit for receiving the frequency difference signal output by the frequency difference detection and converting the frequency difference signal into a digital signal,
the control and processor receives digital signals converted by the first AD acquisition circuit and the second AD acquisition circuit.
Furthermore, the first AD acquisition circuit and the second AD acquisition circuit adopt 14-bit high-precision analog-to-digital converters, the sampling rate is 50ksps, and serial data are output.
Furthermore, the first frequency-adjustable constant-temperature crystal oscillator and the second frequency-adjustable constant-temperature crystal oscillator respectively comprise a constant-temperature circuit, a crystal, an oscillating circuit and a varactor, and the frequency stability of the first frequency-adjustable constant-temperature crystal oscillator and the frequency stability of the second frequency-adjustable constant-temperature crystal oscillator are both 0.05 ppm.
Furthermore, the specification of the LTCC low-temperature co-fired ceramic filter is that the-10 dB bandwidth is more than 500MHz and less than 1000MHz, and the insertion loss is less than 1 dB.
Radio frequency low noise amplifier integrated circuit with gain channel more than or equal to 1GHz and less than 10GHz, 1dB compression point more than or equal to 5dBm and less than 20dBm
Preferably, the frequency difference detection is implemented by using a multiplication circuit formed by diodes, the transmission timing forming circuit is formed by a differential circuit and a high-speed comparator, and the ultra-wideband signal generating circuit is formed by a high-speed triode T1, a charging/discharging capacitor C2 and a charging resistor R2.
Preferably, the amplitude controller adopts three-wire SPI enabling, clock and data bus control, the dynamic adjustment range is 90dB, and the stepping precision is 1 dB.
A sensitivity measurement method applied to an ultra-wideband sampling receiver comprises the following steps:
s1, generating a reference clock by the second frequency controllable constant-temperature crystal oscillator, and transmitting the reference clock into the transmitting timing sequence forming circuit;
s2, shaping the reference clock into a transmitting time sequence signal with small duty ratio by the transmitting time sequence forming circuit, driving the ultra-wideband signal generating circuit at the rear stage to work, and generating the original ultra-wideband impulse pulse;
s3, the band controller carries out band-limiting processing on the original ultra-wideband impulse pulse, so that the ultra-wideband impulse pulse meets the test requirements of the receiver in both time domain and frequency domain;
s4, the amplitude controller controls the attenuation of the amplitude of the ultra-wideband impulse and transmits the ultra-wideband impulse to the receiver to be tested as the injected ultra-wideband impulse;
s5, the first frequency-adjustable constant-temperature crystal oscillator generates a sliding sampling clock and transmits the sliding sampling clock to the tested receiver, and a frequency difference delta f exists between the reference clock and the sliding sampling clock, so that relative time sliding exists between the sliding sampling clock and the injected ultra-wideband impulse pulse, and the tested receiver realizes frequency reduction processing of the ultra-wideband impulse pulse to obtain an intermediate frequency echo;
s6, transmitting the intermediate frequency echo into a first AD acquisition circuit to be converted into a digital signal, transmitting the digital signal to a control and processor by the first AD acquisition circuit to be analyzed, and obtaining the amplitude and the signal-to-noise ratio of the intermediate frequency echo;
s7, the clock signal is transmitted into a frequency difference detection by the first frequency adjustable constant temperature crystal oscillator and the second frequency controllable constant temperature crystal oscillator, and the frequency difference detection obtains a frequency difference signal;
s8, the second AD acquisition circuit receives the frequency difference signal and converts the frequency difference signal into a digital signal, and the digital signal is transmitted to the control and processor for analysis to obtain a specific numerical value delta f;
s9, the control and processor transmits and displays the frequency difference delta f, the intermediate frequency echo amplitude, the signal-to-noise ratio and the sensitivity measurement result on the touch display screen of the display unit 1, and when the signal-to-noise ratio reaches 1:1, the amplitude of the current injected ultra-wideband impulse is the sensitivity value of the receiver.
Further preferably, in the step S9, the method further includes: and the user controls the attenuation of the amplitude controller through a touch display screen of the display unit, so that the adjustment of the injection ultra-wideband pulse amplitude is realized, the injection amplitude is adjusted, and the sensitivity of the tested receiver is determined.
The invention has the beneficial effects that:
1. the invention solves the testing problem of the ultra-wideband sampling receiver, avoids building a complex testing system, utilizes common circuits and devices to construct an automatic, portable and integrated testing device, has simple user operation and low cost, and has very high popularization and application values;
2. the device designed and developed by the invention can simultaneously generate the ultra-wideband impulse pulse and the sampling clock which slides relatively, thereby meeting the sensitivity test requirement of the ultra-wideband sampling receiver. The method can be popularized and applied to the field of sensitivity measurement of equipment such as ultra-wideband system radars, ultra-wideband radio detectors, ultra-wideband positioning and communication and the like;
3. the invention utilizes two paths of frequency-adjustable high-stability constant-temperature crystal oscillators, a differential frequency with a tiny (Hz grade) and high stability is generated between the outputs of the two paths of constant-temperature crystal oscillators by controlling the voltage-controlled end voltages of the two paths of constant-temperature crystal oscillators, a user can manually adjust the attenuation of an amplitude controller on a display interface and observe the intermediate frequency amplitude and the signal-to-noise ratio, the sensitivity value is determined in a manual mode to meet the individual requirements of the user, meanwhile, in order to improve the efficiency, the operation can be carried out by one key, the frequency difference between a reference clock and a sliding sampling clock is set, then the automatic measurement is clicked, a control and processing unit can automatically control the amplitude controller and collect the intermediate frequency amplitude and the signal-to-noise ratio of a measured object, the user measurement result is finally given through automatic analysis and closed.
Drawings
FIG. 1 is a schematic block diagram of the ultra-wideband sampling receiver sensitivity measurement of the present invention;
FIG. 2 is a schematic block diagram of a transmit timing generation circuit of the present invention;
FIG. 3 is a functional block diagram of an ultra-wideband signal generating circuit of the present invention;
the system comprises a display unit 1, a control and processor 2, a first frequency-adjustable constant-temperature crystal oscillator 3, a second frequency-adjustable constant-temperature crystal oscillator 4, a frequency difference detection 5, a transmission time sequence forming circuit 6, an ultra-wideband signal generating circuit 7, a frequency band controller 8, an amplitude controller 9, a first AD acquisition circuit 10 and a second AD acquisition circuit 11.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that although the terms first, second, third, etc. may be used to describe … … in embodiments of the present invention, these … … should not be limited to these terms. These terms are used only to distinguish … …. For example, the first … … can also be referred to as the second … … and similarly the second … … can also be referred to as the first … … without departing from the scope of embodiments of the present invention.
Example 1
As shown in fig. 1, a sensitivity measuring apparatus applied to an ultra-wideband sampling receiver includes:
a display unit 1 for displaying the measuring result and adjusting the control equipment, the display unit 1 adopts a touch display screen to realize human-computer interaction,
the control and processor 2 used as the equipment dispatching center is realized by adopting a high-performance embedded processor, the control and processor 2 is electrically connected with the display unit 1,
a first frequency-adjustable constant-temperature crystal oscillator 3 used for generating a sliding sampling clock and transmitting the sliding sampling clock to a receiver to be tested,
a second frequency-tunable thermostatic crystal oscillator 4 for generating a reference clock,
the first frequency-adjustable constant-temperature crystal oscillator 3 and the second frequency-adjustable constant-temperature crystal oscillator 4 both comprise a constant-temperature circuit, a crystal, an oscillating circuit and a varactor diode inside, the frequency stability of the first frequency-adjustable constant-temperature crystal oscillator 3 and the second frequency-adjustable constant-temperature crystal oscillator 4 is 0.05ppm, a voltage of 0-3.3V is applied to a control end, the output frequency adjusting range of 1ppm can be realized, the requirement of an ultra-wideband sampling receiver on the relative speed of sliding sampling pulses is met,
a frequency difference detection 5 for obtaining frequency difference signals of the first frequency adjustable constant temperature crystal oscillator 3 and the second frequency adjustable constant temperature crystal oscillator 4, wherein a frequency difference detection 5 circuit is realized by adopting a multiplication circuit formed by diodes, the inside of the frequency difference detection 5 circuit comprises a low-pass filter for filtering high-frequency components such as sum frequency and the like, only difference frequency components are reserved,
a transmitting time sequence forming circuit 6 for generating original ultra-wideband impulse pulses, wherein the transmitting time sequence forming circuit 6 receives the reference clock output by the second frequency-adjustable constant-temperature crystal oscillator 4, and the transmitting time sequence forming circuit 6 is composed of a differentiating circuit and a high-speed comparator, and the circuit is shown in fig. 2.
The ultra-wideband signal generating circuit 7 is used for generating the ultra-wideband signal which can control the primary ultra-wideband impulse pulse, the ultra-wideband signal generating circuit 7 receives the transmitting time sequence signal output by the transmitting time sequence forming circuit 6, the ultra-wideband signal generating circuit 7 is composed of a high-speed triode T1, a charging/discharging capacitor C2 and a charging resistor R2, and the circuit is shown in figure 3.
A band controller 8 for controlling the pulse width, the frequency spectrum distribution and the time domain waveform of the transmitted ultra-wideband pulse, so that the ultra-wideband pulse can meet the test requirements of the receiver in the aspects of time domain and frequency domain, the band controller 8 receives the primary ultra-wideband pulse output by the ultra-wideband signal generating circuit 7, the band controller 8 is realized by an LTCC low-temperature co-fired ceramic filter, the LTCC low-temperature co-fired ceramic filter has the specification that-10 dB bandwidth is more than 500MHz and less than 1000MHz, the insertion loss is less than 1dB,
an amplitude controller 9 for attenuation control of the amplitude of the injected signal and transmitting to the receiver to be tested, the amplitude controller 9 is realized by adopting a broadband integrated chip attenuator, the control and processor 2 controls the attenuation of the amplitude controller through an SPI bus, the amplitude controller 9 receives the transmitted ultra-wideband pulse output by the frequency band controller 8, the amplitude controller 9 adopts three-wire SPI enabling, clock and data bus control, the dynamic adjusting range is 90dB, the stepping precision is 1dB,
a first AD acquisition circuit 10 for receiving the intermediate frequency echo returned by the tested receiver and converting the intermediate frequency echo into a digital signal,
a second AD acquisition circuit 11 for receiving the frequency difference signal outputted by the frequency difference detection 5 and converting it into a digital signal,
the first AD acquisition circuit 10 and the second AD acquisition circuit 11 adopt 14-bit high-precision analog-to-digital converters with the sampling rate of 50ksps and serial data output,
the control and processor 2 receives the digital signals converted by the first AD acquisition circuit 10 and the second AD acquisition circuit 11.
The control and processor 2 performs the following functions:
finishing the acquisition and judgment of the intermediate frequency output of the object to be tested, and confirming the intermediate frequency amplitude and the signal-to-noise ratio under the condition of current injection power; acquiring the frequency difference between the sliding sampling clock and the reference clock, and correlating the sensitivity measurement result with the sliding speed of the sampling clock; controlling the amplitude of the injected ultra-wideband impulse pulse, and finding out the critical sensitivity value of the measured object; the control display unit 1 displays the acquisition result and the analysis result, so that the monitoring and the control of a user are facilitated; the attenuation value of the amplitude controller 9 is controlled to adjust the signal power injected into the receiver to be tested.
The operation process of the transmission timing forming circuit 6 is as follows:
the differential circuit obtains positive pulse at the leading edge of the input square wave and negative pulse at the trailing edge, the high-speed comparator sets a proper comparison threshold, and only a small part of the positive pulse can exceed the threshold, so that a narrower rectangular pulse is obtained. The width of the rectangular pulse is controlled by the coupling capacitance C1 of the differentiating circuit and the comparison threshold Vt. In the design process, the width of the output rectangular pulse can be changed by adjusting the two parameters, so that the duty ratio is changed. As C1 decreases, the pulse width narrows; as Vt increases, the pulse width narrows.
The working process of the ultra-wideband signal generating circuit 7 is as follows:
the circuit is triggered by the low duty cycle pulses of the transmit timing forming circuit 6 to produce a primary ultra-wideband impulse on the load resistance RL. During the burst interval, the power supply voltage Vcc is applied to the collector of the avalanche transistor T1 through the resistor R2 and charges the capacitor C2, while the avalanche transistor T1 is not conductive. When the emission time sequence pulse arrives, the triode T1 is conducted, the capacitor C2 discharges the load resistor RL quickly, and a large instantaneous current is formed on the load RL, so that the ultra-wideband impulse pulse is formed. When the capacitor C2 finishes discharging, the ultra-wideband pulse is ended, and the width of the ultra-wideband pulse can be controlled by the selection of the C2. The transmit timing narrow pulse ends and the power supply Vcc charges C2 again, waiting for the next transmit timing pulse to arrive.
In summary, the apparatus utilizes the first frequency-tunable constant temperature crystal oscillator 3 and the second frequency-tunable constant temperature crystal oscillator 4 to generate the sliding sampling clock and the reference clock, respectively, and since the frequency stability of the constant temperature crystal oscillator is very high (0.05 ppm), the stability of the difference frequency between the two is also very high. And by taking the reference clock as a time reference and sliding the sampling clock, the other path of square wave output has relative difference frequency delta f, so that the two paths of square wave signals of a plurality of periods are observed, and the effect that the sampling clock slides relative to the injected ultra-wideband impulse signal is generated.
A transmission timing forming circuit 6 in the reference clock excitation device generates a timing signal of low duty ratio, which is transmitted to an ultra-wideband signal generating circuit 7 to generate an ultra-wideband pulse signal. Then controlling the pulse width, the frequency spectrum distribution and the time domain waveform of the transmitted ultra-wideband pulse through a frequency band controller 8, and meeting the requirements of the object to be tested on the waveform and the frequency spectrum of the injected signal; the control and processor 2 controls the attenuation of the amplitude controller through the SPI bus to realize the adjustment of the amplitude of the injection signal.
And the other path of square wave signal is directly sent to the tested ultra-wideband sampling receiver to be used as a sliding sampling clock.
The ultra-wideband sampling receiver can output an intermediate frequency signal under the condition of obtaining the injected ultra-wideband impulse and the sliding sampling clock. And observing the intermediate frequency output amplitude and the signal-to-noise ratio when the amplitudes of the different injected ultra-wideband pulses reach 1:1, wherein the amplitude of the currently injected ultra-wideband impulse is the sensitivity value of the receiver.
Because the sensitivity of the ultra-wideband sampling receiver is related to the frequency difference delta f between the sliding sampling clock and the reference clock, the device realizes frequency difference control by adjusting the control voltages of two paths of constant-temperature crystal oscillators, obtains difference frequency signals of two paths of clocks by using a frequency difference detection 5 circuit, analyzes a frequency difference value in a control and processor 2 by AD sampling digitization, and finally gives a specific numerical value on a display unit, wherein the sensitivity obtained by a user corresponds to the frequency difference one by one.
The user can manually adjust the attenuation of the amplitude controller on the display interface, observe the intermediate frequency amplitude and the signal-to-noise ratio, and manually determine the sensitivity value to meet the individual requirements of the user.
In order to improve the efficiency, the method can also be operated by one key, after the frequency difference between a reference clock and a sliding sampling clock is set, automatic measurement is clicked, the control and processing unit can automatically control the amplitude controller and acquire the intermediate frequency amplitude and the signal-to-noise ratio of the measured object, and through automatic analysis and closed-loop control, a user measurement result is finally given, so that the measurement efficiency is greatly improved.
Example 2
The embodiment is a sensitivity measurement method applied to an ultra-wideband sampling receiver based on embodiment 1, and the method includes the following steps:
s1, generating a reference clock by the second frequency controllable constant temperature crystal oscillator 4, and transmitting the reference clock into the transmitting time sequence forming circuit 6;
s2, the emission time sequence forming circuit 6 shapes the reference clock into an emission time sequence signal with small duty ratio, drives the ultra-wideband signal generating circuit 7 of the rear stage to work, and generates original ultra-wideband impulse pulse;
s3, the band controller 8 carries out band-limiting processing on the original ultra-wideband impulse, so that the ultra-wideband impulse meets the test requirements of the receiver in both time domain and frequency domain;
s4, the amplitude controller 9 controls the attenuation of the amplitude of the ultra-wideband impulse and transmits the ultra-wideband impulse to the receiver to be tested as the injected ultra-wideband impulse;
s5, the first frequency-adjustable constant-temperature crystal oscillator 3 generates a sliding sampling clock and transmits the sliding sampling clock to the tested receiver, and a frequency difference delta f exists between the reference clock and the sliding sampling clock, so that relative time sliding exists between the sliding sampling clock and the injected ultra-wideband impulse pulse, the tested receiver realizes the frequency reduction processing of the ultra-wideband impulse pulse, and an intermediate frequency echo is obtained;
s6, transmitting the intermediate frequency echo into the first AD acquisition circuit 10 to be converted into a digital signal, and transmitting the digital signal to the control and processor 2 by the first AD acquisition circuit 10 to be analyzed to obtain the amplitude and the signal-to-noise ratio of the intermediate frequency echo;
s7, the first frequency-adjustable constant-temperature crystal oscillator 3 and the second frequency-adjustable constant-temperature crystal oscillator 4 transmit the clock signal into a frequency difference detection wave 5, and the frequency difference detection wave 5 obtains a frequency difference signal;
s8, the second AD acquisition circuit 11 receives the frequency difference signal and converts the frequency difference signal into a digital signal, and then the digital signal is transmitted to the control and processor 2 for analysis to obtain a specific numerical value delta f;
s9, the control and processor 2 transmits and displays the result of the frequency difference delta f, the amplitude of the intermediate frequency echo, the signal-to-noise ratio and the sensitivity measurement on the touch display screen of the display unit 1, when the signal-to-noise ratio is 1:1, the amplitude of the current injected ultra-wideband impulse is the sensitivity value of the receiver, and a user controls the attenuation of the amplitude controller 9 through the touch display screen of the display unit 1 to realize the adjustment of the amplitude of the injected ultra-wideband impulse, performs the adjustment of the injection amplitude and determines the sensitivity of the measured receiver.
Example 3
The embodiment is a sensitivity measurement method applied to an ultra-wideband sampling receiver based on embodiment 1, and the method includes the following steps:
s1, generating a reference clock by the second frequency controllable constant temperature crystal oscillator 4, and transmitting the reference clock into the transmitting time sequence forming circuit 6;
s2, the emission time sequence forming circuit 6 shapes the reference clock into an emission time sequence signal with small duty ratio, drives the ultra-wideband signal generating circuit 7 of the rear stage to work, and generates original ultra-wideband impulse pulse;
s3, the band controller 8 carries out band-limiting processing on the original ultra-wideband impulse, so that the ultra-wideband impulse meets the test requirements of the receiver in both time domain and frequency domain;
s4, the amplitude controller 9 controls the attenuation of the amplitude of the ultra-wideband impulse and transmits the ultra-wideband impulse to the receiver to be tested as the injected ultra-wideband impulse;
s5, the first frequency-adjustable constant-temperature crystal oscillator 3 generates a sliding sampling clock and transmits the sliding sampling clock to the tested receiver, and a frequency difference delta f exists between the reference clock and the sliding sampling clock, so that relative time sliding exists between the sliding sampling clock and the injected ultra-wideband impulse pulse, the tested receiver realizes the frequency reduction processing of the ultra-wideband impulse pulse, and an intermediate frequency echo is obtained;
s6, transmitting the intermediate frequency echo into the first AD acquisition circuit 10 to be converted into a digital signal, and transmitting the digital signal to the control and processor 2 by the first AD acquisition circuit 10 to be analyzed to obtain the amplitude and the signal-to-noise ratio of the intermediate frequency echo;
s7, the first frequency-adjustable constant-temperature crystal oscillator 3 and the second frequency-adjustable constant-temperature crystal oscillator 4 transmit the clock signal into a frequency difference detection wave 5, and the frequency difference detection wave 5 obtains a frequency difference signal;
s8, the second AD acquisition circuit 11 receives the frequency difference signal and converts the frequency difference signal into a digital signal, and then the digital signal is transmitted to the control and processor 2 for analysis to obtain a specific numerical value delta f;
s9, the control and processor 2 transmits and displays the result of the frequency difference delta f, the amplitude of the intermediate frequency echo, the signal-to-noise ratio and the sensitivity measurement on the touch display screen of the display unit 1, when the signal-to-noise ratio 1:1 is reached, the amplitude of the current injected ultra-wideband impulse is the sensitivity value of the receiver, a user performs one-click operation on the attenuation amount of the amplitude controller 9 through the touch display screen of the display unit 1, after the frequency difference between the reference clock and the sliding sampling clock is set, automatic measurement is clicked, the control and processor 2 can automatically control the amplitude controller 9 and collect the intermediate frequency amplitude and the signal-to-noise ratio of the measured object, and the automatic analysis and the closed-loop control are performed.
Claims (9)
1. A sensitivity measuring device for use in an ultra-wideband sampling receiver, comprising:
a display unit (1) for displaying the measurement results and adjusting the control device, the display unit (1) adopts a touch display screen to realize human-computer interaction,
the control and processor (2) is used as a control and processor (2) of an equipment scheduling center, the control and processor (2) is realized by adopting a high-performance embedded processor, the control and processor (2) is electrically connected with the display unit (1),
a first frequency-adjustable constant-temperature crystal oscillator (3) used for generating a sliding sampling clock and transmitting the sliding sampling clock to a receiver to be tested,
a second frequency-tunable thermostatic crystal oscillator (4) for generating a reference clock,
a frequency difference detection (5) for obtaining frequency difference signals of the first frequency-adjustable constant temperature crystal oscillator (3) and the second frequency-adjustable constant temperature crystal oscillator (4),
a transmitting time sequence forming circuit (6) used for generating original ultra-wideband impulse pulses, wherein the transmitting time sequence forming circuit (6) receives the reference clock output by the second frequency-adjustable constant-temperature crystal oscillator (4),
an ultra-wideband signal generating circuit (7) for generating a controllable primary ultra-wideband impulse, said ultra-wideband signal generating circuit (7) receiving a transmission timing signal output by said transmission timing forming circuit (6),
a band controller (8) for controlling the pulse width, the frequency spectrum distribution and the time domain waveform of the transmitted ultra-wideband pulse, so that the ultra-wideband pulse meets the test requirements of the receiver in the aspects of time domain and frequency domain, the band controller (8) is realized by an LTCC low-temperature co-fired ceramic filter, the band controller (8) receives the primary ultra-wideband pulse output by the ultra-wideband signal generating circuit (7),
an amplitude controller (9) used for carrying out attenuation control on the amplitude of the injected signal and transmitting the amplitude to a tested receiver, wherein the amplitude controller (9) is realized by adopting a broadband integrated chip attenuator, the control and processor (2) controls the attenuation of the amplitude controller through an SPI bus, the amplitude controller (9) receives the transmitted ultra-wideband pulse output by the frequency band controller (8),
a first AD acquisition circuit (10) for receiving the intermediate frequency echo returned by the tested receiver and converting the intermediate frequency echo into a digital signal,
a second AD acquisition circuit (11) for receiving the frequency difference signal outputted by the frequency difference detection (5) and converting it into a digital signal,
wherein the control and processor (2) receives the digital signals converted by the first AD acquisition circuit (10) and the second AD acquisition circuit (11).
2. The sensitivity measuring device applied to the ultra-wideband sampling receiver is characterized in that the first AD acquisition circuit (10) and the second AD acquisition circuit (11) adopt 14-bit high-precision analog-to-digital converters with a sampling rate of 50ksps and serial data output.
3. The sensitivity measuring device applied to the ultra-wideband sampling receiver is characterized in that the first frequency-adjustable constant-temperature crystal oscillator (3) and the second frequency-adjustable constant-temperature crystal oscillator (4) respectively comprise a constant-temperature circuit, a crystal, an oscillating circuit and a varactor diode inside, and the frequency stability of the first frequency-adjustable constant-temperature crystal oscillator (3) and the frequency stability of the second frequency-adjustable constant-temperature crystal oscillator (4) are both 0.05 ppm.
4. The apparatus of claim 1, wherein the LTCC filter is specified with-10 dB bandwidth greater than 500MHz and less than 1000MHz and insertion loss less than 1 dB.
5. The sensitivity measuring device applied to the ultra-wideband sampling receiver is characterized in that the frequency difference detection (5) is realized by a multiplication circuit formed by diodes, the transmission timing forming circuit (6) is composed of a differential circuit and a high-speed comparator, and the ultra-wideband signal generating circuit (7) is composed of a high-speed triode T1, a charging/discharging capacitor C2 and a charging resistor R2.
6. The sensitivity measurement device applied to the ultra-wideband sampling receiver according to claim 1, wherein the amplitude controller (9) adopts three-wire SPI enabling, clock and data bus control, the dynamic adjustment range is 90dB, and the stepping precision is 1 dB.
7. A sensitivity measurement method applied to an ultra-wideband sampling receiver is characterized by comprising the following steps:
s1, generating a reference clock by the second frequency controllable constant temperature crystal oscillator (4), and transmitting the reference clock into the transmitting time sequence forming circuit (6);
s2, the emission time sequence forming circuit (6) shapes the reference clock into an emission time sequence signal with small duty ratio, and drives the ultra-wideband signal generating circuit (7) at the later stage to work to generate original ultra-wideband impulse pulse;
s3, the band controller (8) carries out band-limiting processing on the original ultra-wideband impulse, so that the ultra-wideband impulse meets the test requirements of the receiver in both time domain and frequency domain;
s4, an amplitude controller (9) performs attenuation control on the amplitude of the ultra-wideband impulse and transmits the ultra-wideband impulse to a receiver to be tested as injection ultra-wideband impulse;
s5, the first frequency-adjustable constant-temperature crystal oscillator (3) generates a sliding sampling clock and transmits the sliding sampling clock to the tested receiver, and a frequency difference delta f exists between the reference clock and the sliding sampling clock, so that relative time sliding exists between the sliding sampling clock and injected ultra-wideband impulse pulses, the tested receiver realizes frequency reduction processing of the ultra-wideband impulse pulses, and intermediate-frequency echo is obtained;
s6, transmitting the intermediate frequency echo into a first AD acquisition circuit (10) to be converted into a digital signal, and transmitting the digital signal to a control and processor (2) by the first AD acquisition circuit (10) to be analyzed to obtain the amplitude and the signal-to-noise ratio of the intermediate frequency echo;
s7, the first frequency-adjustable constant-temperature crystal oscillator (3) and the second frequency-adjustable constant-temperature crystal oscillator (4) transmit the clock signal into a frequency difference detection wave (5), and the frequency difference detection wave (5) obtains a frequency difference signal;
s8, the second AD acquisition circuit (11) receives the frequency difference signal and converts the frequency difference signal into a digital signal, and then the digital signal is transmitted to the control and processor (2) for analysis to obtain a specific numerical value delta f;
s9, the control and processor (2) transmits and displays the frequency difference delta f, the intermediate frequency echo amplitude, the signal-to-noise ratio and the sensitivity measurement result on a touch display screen of the display unit (1), and when the signal-to-noise ratio is 1:1, the amplitude of the current injected ultra-wideband impulse is the sensitivity value of the receiver.
8. The method for measuring sensitivity of an ultra-wideband sampling receiver according to claim 7, wherein the step S9 further comprises: the attenuation of the amplitude controller (9) is controlled by a user through a touch display screen of the display unit (1), the adjustment of the injection ultra-wideband pulse amplitude is realized, the injection amplitude is adjusted, and the sensitivity of the receiver to be detected is determined.
9. The method for measuring sensitivity of an ultra-wideband sampling receiver according to claim 7, wherein the step S9 further comprises: a user carries out one-key operation on the attenuation of the amplitude controller (9) through a touch display screen of the display unit (1), after frequency difference between a reference clock and a sliding sampling clock is set, the user clicks automatic measurement, and the control and processor (2) can automatically control the amplitude controller (9) and acquire intermediate frequency amplitude and signal to noise ratio of a measured object and carry out automatic analysis and closed-loop control.
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