CN110333491A - A kind of spaceborne terahertz emission meter receiver - Google Patents
A kind of spaceborne terahertz emission meter receiver Download PDFInfo
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- CN110333491A CN110333491A CN201910627662.4A CN201910627662A CN110333491A CN 110333491 A CN110333491 A CN 110333491A CN 201910627662 A CN201910627662 A CN 201910627662A CN 110333491 A CN110333491 A CN 110333491A
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- amplifier
- spaceborne
- noise
- low
- frequency
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- G—PHYSICS
- 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
- G01S7/28—Details of pulse systems
- G01S7/285—Receivers
Abstract
The present invention provides a kind of spaceborne terahertz emission meter receivers, comprising: frequency mixer, low-noise amplifier, electrically controlled attenuator, intermediate frequency amplifier, filter, wave detector, dc amplifier and the low-pass filter successively coupled；Wherein, the frequency mixer is for receiving noise signal and carrying out down coversion；Low-noise amplifier is used for the low noise amplification for receiving intermediate frequency link；Electrically controlled attenuator is for adjusting receiver link gain；Intermediate frequency amplifier is used to intermediate-freuqncy signal carrying out amplitude amplification；Filter is used to control and receive the noise bandwidth in machine channel；Wave detector is for detecting receiver channel watt level；Dc amplifier is used to detecting circuit carrying out direct current amplification；Low-pass filter is used to filter out the noise component(s) in DC voltage.Higher sensitivity and the linearity may be implemented in the spaceborne terahertz emission meter receiver, while receiver is with good stability.
Description
Technical field
The present invention relates to microwave receiver technical field, in particular to a kind of spaceborne terahertz emission meter receiver.
Background technique
Radiometer is worked by receiving the microwave signal of measured object, generally by antenna system, receiver sum number
It is formed according to processing system, the faint microwave signal of antenna system reception target is handled via receiver, output detection electricity
Pressure, is handled for data processing system, and (generally d. c. voltage signal, this is straight for the bright temperature temperature signal of final output target
Galvanic electricity pressure and the bright temperature of target are linear).The working principle of radiometer is mainly based upon Planck blackbody radiation law, connects
Receipts machine is high sensitive receiver, has strict requirements to noise coefficient and receiver gain stability, while being for convenience
System calibration, it is desirable that receiver has the high linearity.
With the continuous development of satellite fields, radiometer working frequency is higher and higher, at present more than 200GHz.Consider
Detection sensitivity and the linearity to existing spaceborne application field Terahertz frequency range wave detector is poor, combines technological design,
Superhet structure is generally used in the band radiation meter, carries out signal demodulator in intermediate-frequency band, in addition the frequency range low noise
Acoustic amplifier performance indicator and stabilization are lacking, and are typically chosen and design low-noise amplifier in frequency mixer rear class, effectively
Avoid high band design and implementation difficult point.On the other hand, as satellite load subsystem is to the receiver for radiometer detection linearity
It is higher and higher, it is difficult to meet the requirement of high linearity and sensitivity simultaneously using previous single detector diode.
Summary of the invention
The purpose of the present invention is to provide a kind of spaceborne terahertz emission meter receivers, to solve existing Terahertz frequency range
Receiver for radiometer the problem of being difficult to meet simultaneously the requirement of high linearity and sensitivity.
To achieve the above object, the present invention provides a kind of spaceborne terahertz emission meter receivers, comprising: successively couples
Frequency mixer, low-noise amplifier, electrically controlled attenuator, intermediate frequency amplifier, filter, wave detector, dc amplifier and low-pass filtering
Device；Wherein, the frequency mixer is for receiving noise signal and carrying out down coversion；
The low-noise amplifier is used for the low noise amplification for receiving intermediate frequency link；
The electrically controlled attenuator is for adjusting receiver link gain；
The intermediate frequency amplifier is used to intermediate-freuqncy signal carrying out amplitude amplification；
The filter is used to control and receive the noise bandwidth in machine channel；
The wave detector is for detecting receiver channel watt level；
The dc amplifier is used to detecting circuit carrying out direct current amplification；
The low-pass filter is used to filter out the noise component(s) in DC voltage.
Preferably, further include:
With the frequency multiplier of frequency mixer coupling, and the dielectric oscillator with frequency multiplier coupling, the medium oscillation
Device carries out process of frequency multiplication for generating oscillating microwave, then through the frequency multiplier to generate local oscillator needed for the frequency mixer work and believe
Number.
Preferably, receiver uses superhet down coversion mode, the frequency mixer uses harmonic mixing form.
Preferably, the attenuation range of the electrically controlled attenuator is no less than 10dB.
Preferably, the wave detector is square law detection, composed in parallel by balanced type detector diode.
Preferably, the dc amplifier is made of operational amplifier, amplification factor range is any in 100~1000
One value.
Preferably, the low-pass filter is the one stairs active wave filter of operational amplifier composition.
Preferably, the frequency range that receiver receives signal is 200GHz~300GHz, radiated for spaceborne total power type
In meter.
Preferably, noise coefficient is less than when the low-noise amplifier is to the low noise amplification for receiving intermediate frequency link
1.5dB, gain are greater than 20dB.
Receiver provided by the invention uses super-heterodyne architecture, according to current spaceborne application field Terahertz frequency range component
Performance characteristics rationally design composition inside receiver, select harmonic mixing form, effectively reduce local oscillator design difficulty.Mixing
Device rear class selects low-noise amplifier, avoids Terahertz frequency range low-noise amplifier design difficulty, while guaranteeing that receiver is made an uproar
Sonic system number.Wave detector is made of balanced type detector diode, and preferable detection sensitivity and the linearity can be achieved at the same time.
Total power type Terahertz frequency range superhet receiver for radiometer, receiver noise factor may be implemented in the receiver
It can be better than 7dB, link gain stability is better than 0.0001dB/dB, and the linearity is better than 0.99999, and receiver sensitivity can reach
0.5K。
Detailed description of the invention
Fig. 1 is the composition block diagram of spaceborne terahertz emission meter receiver provided by the invention；
Fig. 2 is the wave detector composition block diagram that the preferred embodiment of the present invention provides；
Fig. 3 is low-pass filter (integrator) block diagram that the preferred embodiment of the present invention provides.
Specific embodiment
Below with reference to attached drawing of the invention, the technical scheme in the embodiment of the invention is clearly and completely described
And discussion, it is clear that as described herein is only a part of example of the invention, is not whole examples, based on the present invention
In embodiment, those of ordinary skill in the art's every other implementation obtained without making creative work
Example, belongs to protection scope of the present invention.
For the ease of the understanding to the embodiment of the present invention, make by taking specific embodiment as an example below in conjunction with attached drawing further
It illustrates, and each embodiment does not constitute the restriction to the embodiment of the present invention.
Refering to what is shown in Fig. 1, a kind of spaceborne terahertz emission meter receiver provided in this embodiment, comprising: successively couple
Frequency mixer 1, low-noise amplifier 4, electrically controlled attenuator 5, intermediate frequency amplifier 6, filter 7, wave detector 8, dc amplifier 9 and low
The modules such as bandpass filter 10.
Wherein, frequency mixer 1 is for receiving noise signal and carrying out down coversion.Specifically, entire spaceborne terahertz emission connects
Receipts machine uses superhet down coversion mode, and frequency mixer uses harmonic mixer form.Here frequency mixer 1 is set as noise coefficient
Less than 5dB, IF frequency can cover direct current to 10GHz, and standing wave is less than 2.5.The receiver does not design low noise in frequency mixer prime
Acoustic amplifier, low-noise amplifier are designed at frequency mixer rear class.
Low-noise amplifier 4 is used for the low noise amplification for receiving intermediate frequency link, and specifically, the noise figure of amplifier is small
In 1.5dB, gain is greater than 20dB, working frequency range 1.5GHz-2.5GHz.
Electrically controlled attenuator 5 enters rear class wave detector watt level for adjusting receiver link gain, with control, makes to enter
Detector noise power is in diode-sensitivity and the optimal working range of the linearity, and inside is constituted by a diode.Specifically,
Its attenuation is controlled by External Control Voltage, its attenuation is arranged here not less than 10dB, working frequency range 1.5GHz-
2.5GHz。
Intermediate frequency amplifier 6 is used to intermediate-freuqncy signal carrying out amplitude amplification.Here be set to its 1dB compression point be greater than+
15dBm。
Filter 7 is used to control and receive the noise bandwidth in machine channel.And the bandwidth of filter 3dB is needed depending on radiometer
Received external noise bandwidth.Specifically, LC dielectric filter, free transmission range 1.5-2.5GHz are selected here, and bandwidth is
1GHz.In other preferred embodiments, filter 7 be can choose as general LC filter, cavity body filter, SAW filter
Etc. types filter, it is desirable that it is with preferable squareness factor and Out-of-band rejection ability.
Input high-frequency signal is converted to DC voltage for detecting receiver channel watt level by wave detector 8.Here
Square law detecting way is specifically used, is made of two balance detection diodes, the linearity is better than 0.99999.Such as 2 institute of attached drawing
Show, the wave detector 8 in the present embodiment is made of 3dB electric bridge, detector diode D1 and D2, low-pass filter, wherein D1 and D2
It can be identical.Preferably, low pass filter cutoff frequency here is set as 200MHz.
Dc amplifier 9 is used to detecting circuit carrying out direct current amplification, by choosing suitable direct current amplification factor, makes most
The receiver detecting circuit range exported eventually is 1V-8V.Specifically, the dc amplifier 9 in the present embodiment is by operational amplifier
Composition, amplification factor range are 100~1000, can select any one value therein as needed.
Low-pass filter 10 is used to filter out the noise component(s) in DC voltage to obtain final tributary voltage signal.This reality
It applies in example, low-pass filter 10 is equivalent to integrator, and the time of integration depends on the resistance and capacitance parameter of filter, when integral
Between and receiver noise bandwidth directly affect radiometer sensitivity.In further preferred embodiments, which is fortune
Calculate the one stairs active wave filter composition of amplifier composition, specific as shown in Fig. 3, the equal value of resistance R1, R2, R3 therein
100K Ω, capacitor C value 0.047uF.
In addition, the receiver further includes the frequency multiplier 2 coupled with frequency mixer 1, and the dielectric oscillator coupled with frequency multiplier 2
3.Dielectric oscillator 3 carries out process of frequency multiplication for generating oscillating microwave, then through frequency multiplier 2 to generate the required sheet of frequency mixer work
Shake signal.Wherein, generate frequency mixer 1 work required local oscillation signal when, the reference frequency output of dielectric oscillator 3 be 13GHz~
15GHz, the output frequency of the present embodiment dielectric oscillator 3 are set as 14.5GHz, and the frequency multiplication number of frequency multiplier 2 is 8 times, final defeated
It is out 116GHz to the local frequency of the local oscillation signal of frequency mixer 1, and local oscillator output power (frequency multiplier final output power) is no
Lower than+10dBm.
The frequency range that receiver provided in this embodiment receives signal is 200GHz~300GHz, is used for spaceborne total power
In type radiometer.It is arranged by above-mentioned receiver structure, receiver for radiometer sensitivity provided by the invention can achieve 0.5K,
Channel linear degree can achieve 0.99999, can greatly provide convenience for radiometer data processing.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those skilled in the art in the technical scope disclosed by the present invention, to deformation or replacement that the present invention is done, should be covered
Within protection scope of the present invention.Therefore, protection scope of the present invention should be subject to the scope of protection of the claims.
Claims (9)
1. a kind of spaceborne terahertz emission meter receiver characterized by comprising frequency mixer, the low noise amplification successively coupled
Device, electrically controlled attenuator, intermediate frequency amplifier, filter, wave detector, dc amplifier and low-pass filter；Wherein, the frequency mixer
For receiving noise signal and carrying out down coversion；
The low-noise amplifier is used for the low noise amplification for receiving intermediate frequency link；
The electrically controlled attenuator is for adjusting receiver link gain；
The intermediate frequency amplifier is used to intermediate-freuqncy signal carrying out amplitude amplification；
The filter is used to control and receive the noise bandwidth in machine channel；
The wave detector is for detecting receiver channel watt level；
The dc amplifier is used to detecting circuit carrying out direct current amplification；
The low-pass filter is used to filter out the noise component(s) in DC voltage.
2. spaceborne terahertz emission meter receiver according to claim 1, which is characterized in that further include: it is mixed with described
The frequency multiplier of device coupling, and the dielectric oscillator with frequency multiplier coupling, the dielectric oscillator are used to generate oscillating microwave,
Process of frequency multiplication is carried out through the frequency multiplier again to generate the required local oscillation signal of the frequency mixer work.
3. spaceborne terahertz emission meter receiver according to claim 1 or 2, which is characterized in that receiver is using super outer
Poor down coversion mode, the frequency mixer use harmonic mixing form.
4. spaceborne terahertz emission meter receiver according to claim 1, which is characterized in that the electrically controlled attenuator declines
Subtract range and is no less than 10dB.
5. spaceborne terahertz emission meter receiver according to claim 1, which is characterized in that the wave detector is square law
Detection is composed in parallel by balanced type detector diode.
6. spaceborne terahertz emission meter receiver according to claim 1, which is characterized in that the dc amplifier is by transporting
Amplifier composition is calculated, amplification factor range is any one value in 100~1000.
7. spaceborne terahertz emission meter receiver according to claim 1, which is characterized in that the low-pass filter is fortune
Calculate the one stairs active wave filter of amplifier composition.
8. spaceborne terahertz emission meter receiver according to claim 1, which is characterized in that the frequency of receiver reception signal
Rate range is 200GHz~300GHz, in spaceborne total power type radiometer.
9. spaceborne terahertz emission meter receiver according to claim 1, which is characterized in that the low-noise amplifier pair
In reception when the low noise amplification of frequency link, noise coefficient is less than 1.5dB, and gain is greater than 20dB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910627662.4A CN110333491A (en) | 2019-07-10 | 2019-07-10 | A kind of spaceborne terahertz emission meter receiver |
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| CN201910627662.4A CN110333491A (en) | 2019-07-10 | 2019-07-10 | A kind of spaceborne terahertz emission meter receiver |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111307180A (en) * | 2020-04-14 | 2020-06-19 | 国网河南省电力公司信息通信公司 | Method for reducing power supply noise of optical balance receiver for optical cable detection |
| CN113691269A (en) * | 2021-08-30 | 2021-11-23 | 上海航天测控通信研究所 | Frequency point-variable high-sensitivity satellite measurement and control receiver |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111307180A (en) * | 2020-04-14 | 2020-06-19 | 国网河南省电力公司信息通信公司 | Method for reducing power supply noise of optical balance receiver for optical cable detection |
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| CN113691269B (en) * | 2021-08-30 | 2022-03-25 | 上海航天测控通信研究所 | Frequency point-variable high-sensitivity satellite measurement and control receiver |
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