Solar radio radiometer, spectrum observation system and control method
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A solar radio and control method technology, applied in the field of solar radio radiometers, to achieve the effects of reducing the nonlinearity of the system, achieving low cost, and improving sensitivity
Active Publication Date: 2020-08-18
SHANDONG UNIV
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[0009] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a solar radiometer and spectrum observation system and control method, aiming at the reduction in sensitivity caused by the structural gain of the solar radiometer observation system in radio astronomy and the reduction in time resolution caused by integration In this case, an improved observation structure is proposed, which can be used as a spectrum observation device or a radiometer observation, and can flexibly adjust the integration bandwidth, and at the same time use the form of sliding integration to ensure the time resolution of the original data of the spectrum and radiometer
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Embodiment 1
[0040] This embodiment provides a solar radiometer and spectrum observation system, which adopts ADC+FPGA with high sampling bandwidth and high sampling rate for signal processing, and adopts zero balance calculation by switching to eliminate gain influence.
[0041] Table 1 Comparison of structural performance of three radiometers
[0042]
[0043] Table 1: T a is the antenna output noise temperature, T r is the receiver system noise temperature, T ref To refer to the load noise temperature, G is the system gain, B is the system bandwidth (the bandwidth before detection, usually more than ten MHz), and τ is the system pre-integration time.
[0044] full power radiometer figure 1 As shown, the system structure is composed of antenna, video amplifier, mixer, intermediate frequency amplifier, square law detector, low-pass filter, ADC and so on. The square law detector converts the RF power signal output by the intermediate frequency amplifier into a voltage signal. The d...
Embodiment 2
[0051] This embodiment provides a solar radiometer and spectrum observation control method, using the solar radiometer and spectrum observation system described in Embodiment 1, the control process is as follows Figure 8 Shown:
[0052] (1) The upper computer sends parameters to control the square wave generator and synchronization module, thereby controlling the system integration time τ and integration bandwidth B.
[0053] (2) The square wave generator and synchronization module adjust the pulse duty cycle according to the total integration time required by the system and the output value of the final balance judgment, thereby adjusting the ratio time between the antenna and the reference input.
[0055] Among them, τ is the system integration time, τ 21 For the switching pulse located at the antenna and the reference load T ref1 The turn-on time of the antenna when between, τ 1 is the reference load T ref1 c...
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Abstract
The invention discloses a solar radio radiometer, a frequency spectrum observation system and a control method. According to the technical scheme, the solar radio radiometer comprises a selector switch, an amplifier I, a filter I, a frequency mixer, an amplifier II, a filter II, an analog-digital converter, an FPGA signal processing module and an upper computer which are connected in sequence, wherein the change-over switch is connected with two different reference loads to provide brightness temperature calibration, and the change-over switch is connected with the antenna and adjusts the output frequency or duty ratio of the antenna and the reference source according to balance judgment. The invention aims to solve the problems of sensitivity reduction caused by structural gain of a solarradio radiometer observation system and time resolution reduction caused by integration in radio astronomy. An improved zero-balance discal observation structure is provided, the improved zero-balance discal observation structure can be used as spectrum observation equipment and can also be used for radiometer observation, a calibration principle and a calibration process are provided, the integral bandwidth can be flexibly adjusted, Meanwhile, the time resolution of the spectrum and radiometer original data is ensured in a sliding integral form.
Description
technical field [0001] The invention relates to the field of solar radio radiometers, in particular to a solar radio radiometer, a spectrum observation system and a control method. Background technique [0002] Any object emits electromagnetic waves to the outside world under certain conditions. As a high-sensitivity electromagnetic wave detection device, radiometers are widely used in fields such as space weather, ground remote sensing, target detection and identification, and security inspection. The two most common and used types are The radiometer structure is: full power radiometer, Dicke radiometer and other types of radiometers, among which Dicke radiometer is divided into balanced type and unbalanced type. [0003] The structure of the full power radiometer is simple, and the square law detector is directly used to convert the power signal into a voltage, and after passing through a low-pass filter (pre-integrator), the ADC is used for quantitative acquisition and up...
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