CN212275851U - Low temperature receiver is with two grades of noise calibration subassemblies - Google Patents
Low temperature receiver is with two grades of noise calibration subassemblies Download PDFInfo
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- CN212275851U CN212275851U CN202021042803.0U CN202021042803U CN212275851U CN 212275851 U CN212275851 U CN 212275851U CN 202021042803 U CN202021042803 U CN 202021042803U CN 212275851 U CN212275851 U CN 212275851U
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Abstract
The utility model discloses a double-gear noise calibration component for a low-temperature receiver, which comprises a direct-current voltage stabilization and control module, a noise source circuit, a double-gear switch circuit formed by connecting a first single-pole double-throw switch, a high attenuator, a low attenuator, a second single-pole double-throw switch, a power distributor and two output end SMA connectors in sequence; the noise source circuit generates and outputs a broadband noise signal, the input end of the double-gear switch circuit is connected with the output end of the noise source circuit, the first single-pole double-throw switch and the second single-pole double-throw switch are all connected with the direct-current voltage stabilizing and controlling module, the direct-current voltage stabilizing and controlling module is used for providing a direct-current power supply for the noise source circuit to excite noise, and the direct-current voltage stabilizing and controlling module is used for controlling and driving the first single-pole double-throw switch and the second single-pole double-throw switch.
Description
Technical Field
The utility model relates to a microwave device technical field specifically is a two grades of noise calibration subassemblies for low temperature receiver.
Background
The main observation target of the low-temperature receiving system in actual use is a radio source in the universe, the environmental background noise is very low, when the azimuth and the pitching of the antenna change, the background noise changes, and if the noise temperature of the system is not calibrated in time, the testing precision is seriously influenced. The low-temperature receiver is difficult to measure the noise temperature of the system at any time by using a noise coefficient analyzer during observation.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a two grades of noise calibration subassemblies for low temperature receiver provides stable noise calibration signal, and noise calibration signal injects into from the coupling interface of low temperature receiver front end for the noise temperature of low temperature receiver under the different observation modes of calibration improves the stability of surveing.
The technical scheme of the utility model is that:
a double-gear noise scaling component for a low-temperature receiver comprises a direct-current voltage-stabilizing and control module, a noise source circuit, a double-gear switch circuit and a power divider, wherein the double-gear switch circuit consists of a first single-pole double-throw switch, a high attenuator, a low attenuator, a second single-pole double-throw switch, and two output end SMA connectors; the broadband noise source circuit generates and outputs broadband noise signals, the movable end of the first single-pole double-throw switch is connected with the output end of the noise source circuit, the two immovable ends of the first single-pole double-throw switch are respectively connected with the input end of the high attenuator and the input end of the low attenuator, the two immovable ends of the second single-pole double-throw switch are respectively connected with the output end of the high attenuator and the output end of the low attenuator, the movable end of the second single-pole double-throw switch is connected with the input end of the power distributor, and the two output ends of the power distributor are respectively connected with a corresponding output end SMA connector; the noise source circuit, the first single-pole double-throw switch and the second single-pole double-throw switch are all connected with the direct-current voltage stabilizing and controlling module, the direct-current voltage stabilizing and controlling module is used for providing a direct-current power supply for the noise source circuit to excite noise, and the direct-current voltage stabilizing and controlling module is used for controlling and driving the moving ends of the first single-pole double-throw switch and the second single-pole double-throw switch.
The noise source circuit comprises a resistor R1, an inductor L1, a capacitor C1, a capacitor C2, a noise diode D1 and a matching attenuator T1, one end of the resistor R1 is connected with a direct-current power supply provided by a direct-current voltage-stabilizing and control module, the other end of the resistor R1 is connected with one end of the inductor L1, one end of a capacitor C1, one end of the capacitor C2 and the cathode of the noise diode D1 are connected with the other end of the inductor L1, the other end of the capacitor C2 and the anode of the noise diode D1 are grounded, the other end of the capacitor C1 is connected with the input end of the matching attenuator, and the output end of the matching attenuator is used as the output end of the noise source circuit.
The attenuation of the high attenuator is 10 times of that of the low attenuator.
The output end of the noise source circuit is connected with the input end of the double-gear switch circuit through a microstrip line.
The first single-pole double-throw switch, the high attenuator, the low attenuator, the second single-pole double-throw switch and the power divider are all welded on the microstrip circuit.
The first single-pole double-throw switch and the second single-pole double-throw switch are both FET single-pole double-throw switches, and the direct-current voltage stabilizing and controlling module is a single chip microcomputer or a hardware logic circuit.
The noise source circuit is arranged on the constant temperature module, and the constant temperature module is connected with the direct current voltage stabilization and control module to realize automatic constant temperature monitoring.
The constant temperature module adopts a semiconductor thermoelectric refrigerating device.
The low temperature receiver is with two grades of noise calibration subassemblies including the casing, the casing on be connected with two output SMA connectors, noise source circuit and two grades of switch circuits all set up in the casing, two output of power divider pass through microstrip circuit and are connected with two output SMA connectors.
The utility model has the advantages that:
the utility model discloses a two grades of switch circuits can switch over two grades of output signal and not output signal state fast, and two grades of noise calibration signals of output realize different purposes, and high-grade noise calibration signal confirms the noise temperature of low temperature receiver under initial condition, and low-grade noise calibration signal confirms the noise temperature of low temperature receiver under the observation state; the utility model discloses noise source circuit configuration constant temperature module real time monitoring and the physical temperature who keeps the noise source circuit to reduce the influence of environment.
To sum up, the utility model has the characteristics of multiple output state, signal stability height can be convenient, mark the system noise temperature of cryogenic receiver running state fast.
Drawings
Fig. 1 is a schematic view of the appearance structure of the present invention.
Fig. 2 is a schematic block diagram of the present invention.
Fig. 3 is a circuit diagram of the noise source circuit of the present invention.
Fig. 4 is a circuit diagram of the dual-stage switch circuit of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-4, a double-gear noise calibration assembly for a low-temperature receiver includes a housing 1, a dc voltage regulation and control module 3 disposed in the housing 1, a noise source circuit 5, a constant temperature module 4, a first single-pole double-throw switch T2, a high attenuator T3, a low attenuator T4, a second single-pole double-throw switch T5, a power divider T6, and two output SMA connectors 2 connected to the housing; the first single-pole double-throw switch T2 and the second single-pole double-throw switch T5 both adopt FET single-pole double-throw switches, and the direct-current voltage stabilizing and controlling module 3 adopts a single chip microcomputer or a hardware logic circuit;
the noise source circuit 5 comprises a resistor R1, an inductor L1, a capacitor C1, a capacitor C2, a noise diode D1 and a matching attenuator T1, wherein one end of the resistor R1 is connected with a direct-current voltage-stabilizing and control module-provided direct-current power supply, the other end of the resistor R1 is connected with one end of the inductor L1, one end of a capacitor C1, one end of the capacitor C2 and the cathode of the noise diode D1 are all connected with the other end of the inductor L1, the other end of the capacitor C2 and the anode of the noise diode D1 are all grounded, the other end of the capacitor C1 is connected with the input end of the matching attenuator, and the output end of the matching attenuator is used as the output end of; after a direct-current power supply is provided by the direct-current voltage stabilizing and controlling module 3, a filter network consisting of a resistor R1, an inductor L1, a capacitor C1 and a capacitor C2 is added to the cathode of the noise diode D1 to excite a broadband white noise signal capable of covering 1GHz-15GHz, the broadband white noise signal is subjected to impedance matching through a matching attenuator T1 and then is sent to the input end of the double-gear switching circuit through microstrip current, in order to ensure the stability of the noise signal, a semiconductor thermoelectric refrigeration device is selected as a constant temperature module, the ambient temperature of the noise source circuit is kept constant at +40 ℃, and the constant temperature module is connected with the direct-current voltage stabilizing and controlling module for automatic constant temperature monitoring;
the first single-pole double-throw switch T2, the high attenuator T3, the low attenuator T4, the second single-pole double-throw switch T5 and the power divider T6 are welded on the microstrip circuit to form a double-stage switch circuit; the movable end of a first single-pole double-throw switch T2 is used as the input end of a double-gear switch circuit and is connected with the output end of a noise source circuit through a microstrip line, two immovable ends of a first single-pole double-throw switch T2 are respectively connected with the input end of a high attenuator T3 and the input end of a low attenuator T4, two immovable ends of a second single-pole double-throw switch T5 are respectively connected with the output end of a high attenuator T3 and the output end of a low attenuator T4, the movable end of a second single-pole double-throw switch T5 is connected with the input end of a power distributor T6, and two output ends of a power distributor T6 are respectively connected with a corresponding output end SMA connector 2 through a microstrip circuit; the first single-pole double-throw switch T2 and the second single-pole double-throw switch T5 are both connected with the direct-current voltage-stabilizing and control module 3, and the direct-current voltage-stabilizing and control module 3 is used for controlling and driving the movable ends of the first single-pole double-throw switch T2 and the second single-pole double-throw switch T5, so that the switching speed of the working state of the component is less than 10 microseconds; the attenuation of the high attenuator T4 is 10 times of that of the low attenuator T4, that is, the noise amplitude of the low-grade noise scaling signal output by the two-grade switch circuit is one tenth of that of the high-grade noise scaling signal.
When the direct-current voltage-stabilizing and control module 3 controls the first single-pole double-throw switch T2 and the second single-pole double-throw switch T5 to be connected with the high attenuator T3, the output end of the power divider T6 outputs a low-level noise scaling signal; when the direct-current voltage-stabilizing and control module 3 controls the first single-pole double-throw switch T2 and the second single-pole double-throw switch T5 to be connected with the low attenuator T4, the high-grade noise calibration signal is output by the power divider T6; when the direct-current voltage-stabilizing and control module 3 controls the first single-pole double-throw switch T2 to be connected with the high attenuator T3, the second single-pole double-throw switch T5 to be connected with the low attenuator T4 or controls the first single-pole double-throw switch T2 to be connected with the low attenuator T4, and the second single-pole double-throw switch T5 to be connected with the high attenuator T3, the power divider T6 is in a no-signal output state, and since the standing-wave ratio of the high attenuator T3 is superior to that of the low attenuator T4, the matching performance of the circuit is better, and the noise injection signal can be turned off without an external control switch.
The utility model discloses install near low temperature receiver, the two way two grades of noise calibration signals of output receive low temperature receiver's levogyration, dextrorotation coupling injection port respectively through coaxial radio frequency, send into low temperature receiver refrigeration microwave link in, handle the back through processing such as low temperature low noise amplification, frequency conversion, filtering by data terminal. The utility model discloses low temperature receiver can produce the two grades of noise calibration signals of output and realize no signal output state with two grades of noise calibration subassemblies, control output high-grade noise calibration signal at the beginning of the observation, do the Y factor that output power's ratio obtained with no signal output state, calculate the noise temperature of low temperature receiving link under initial condition; and controlling to output a low-grade noise calibration signal during radio observation, and determining the noise temperature of the low-temperature receiving link under the observation state.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The utility model provides a two grades of noise calibration subassemblies for low temperature receiver which characterized in that: the system comprises a direct-current voltage stabilization and control module, a noise source circuit, a double-gear switch circuit consisting of a first single-pole double-throw switch, a high attenuator, a low attenuator, a second single-pole double-throw switch, a power distributor and two output end SMA connectors; the broadband noise source circuit generates and outputs broadband noise signals, the movable end of the first single-pole double-throw switch is connected with the output end of the noise source circuit, the two immovable ends of the first single-pole double-throw switch are respectively connected with the input end of the high attenuator and the input end of the low attenuator, the two immovable ends of the second single-pole double-throw switch are respectively connected with the output end of the high attenuator and the output end of the low attenuator, the movable end of the second single-pole double-throw switch is connected with the input end of the power distributor, and the two output ends of the power distributor are respectively connected with a corresponding output end SMA connector; the noise source circuit, the first single-pole double-throw switch and the second single-pole double-throw switch are all connected with the direct-current voltage stabilizing and controlling module, the direct-current voltage stabilizing and controlling module is used for providing a direct-current power supply for the noise source circuit to excite noise, and the direct-current voltage stabilizing and controlling module is used for controlling and driving the moving ends of the first single-pole double-throw switch and the second single-pole double-throw switch.
2. The dual-range noise scaling module for a cryogenic receiver of claim 1, wherein: the noise source circuit comprises a resistor R1, an inductor L1, a capacitor C1, a capacitor C2, a noise diode D1 and a matching attenuator T1, one end of the resistor R1 is connected with a direct-current power supply provided by a direct-current voltage-stabilizing and control module, the other end of the resistor R1 is connected with one end of the inductor L1, one end of a capacitor C1, one end of the capacitor C2 and the cathode of the noise diode D1 are connected with the other end of the inductor L1, the other end of the capacitor C2 and the anode of the noise diode D1 are grounded, the other end of the capacitor C1 is connected with the input end of the matching attenuator, and the output end of the matching attenuator is used as the output end of the noise source circuit.
3. The dual-range noise scaling module for a cryogenic receiver of claim 1, wherein: the attenuation of the high attenuator is 10 times of that of the low attenuator.
4. The dual-range noise scaling module for a cryogenic receiver of claim 1, wherein: the output end of the noise source circuit is connected with the input end of the double-gear switch circuit through a microstrip line.
5. The dual-range noise scaling module for a cryogenic receiver of claim 1, wherein: the first single-pole double-throw switch, the high attenuator, the low attenuator, the second single-pole double-throw switch and the power divider are all welded on the microstrip circuit.
6. The dual-range noise scaling module for a cryogenic receiver of claim 1, wherein: the first single-pole double-throw switch and the second single-pole double-throw switch are both FET single-pole double-throw switches, and the direct-current voltage stabilizing and controlling module is a single chip microcomputer or a hardware logic circuit.
7. The dual-range noise scaling module for a cryogenic receiver of claim 1, wherein: the noise source circuit is arranged on the constant temperature module, and the constant temperature module is connected with the direct current voltage stabilization and control module to realize automatic constant temperature monitoring.
8. The dual-range noise scaling module for a cryogenic receiver of claim 7, wherein: the constant temperature module adopts a semiconductor thermoelectric refrigerating device.
9. The dual-range noise scaling module for a cryogenic receiver of claim 1, wherein: the low temperature receiver is with two grades of noise calibration subassemblies including the casing, the casing on be connected with two output SMA connectors, noise source circuit and two grades of switch circuits all set up in the casing, two output of power divider pass through microstrip circuit and are connected with two output SMA connectors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021042803.0U CN212275851U (en) | 2020-06-08 | 2020-06-08 | Low temperature receiver is with two grades of noise calibration subassemblies |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021042803.0U CN212275851U (en) | 2020-06-08 | 2020-06-08 | Low temperature receiver is with two grades of noise calibration subassemblies |
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| Publication Number | Publication Date |
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| CN212275851U true CN212275851U (en) | 2021-01-01 |
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| CN202021042803.0U Active CN212275851U (en) | 2020-06-08 | 2020-06-08 | Low temperature receiver is with two grades of noise calibration subassemblies |
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