The Method of Using the Sun as a Radio Source to Measure the g/t Value of Vehicle-mounted Telemetering Equipment

Abstract

The invention provides a method for utilizing sun as a radio source to measure a G / T value of a vehicle-mounted remote-measuring device and belongs to the technical field of remote measuring. The method is applied to the S-frequency-band vehicle-mounted remote-measuring device with a 5.2 m antenna and uses the sun as a radio star, sun noise power and cold air noise power are measured, then the G / T value of the remote-measuring device is obtained according to a formula, and when the G / T value is calculated, values K1 and K2 related by the formula are corrected, and a sun flow value s and signals measured by a spectrometer are corrected. In addition, the invention further provides a step of normatively measuring the sun noise power and cold air noise power. The method has good operability on the remote-measuring device, and testing accuracy is improved.

Description

technical field [0001] The invention belongs to the technical field of telemetry, and in particular refers to a method for measuring the G / T value of vehicle-mounted telemetry equipment by using the sun as a radio source. Background technique [0002] The equipment quality factor G / T value is an important index to measure the performance of the equipment receiving system, and it is also one of the must-test items in the equipment index test. G is the antenna gain, T is the system noise temperature, the higher the G / T value, the better the system receiving performance. At present, the commonly used methods for testing the G / T value of equipment mainly include: calibration tower method, satellite source method, and radio astronomy method. [0003] The calibration tower method is to use the calibration tower near the equipment for testing. By setting up the signal source and the standard gain speaker on the calibration tower, the equipment antenna is driven to align with the t...

AI Technical Summary

Problems solved by technology

[0005] (2) High accuracy requirements for beacon erection

The standard gain speakers required to test the G / T value usually do not have good erection conditions, and the speakers cannot be erected stably, resulting in relatively large fluctuations in the readings of the test data. In actual measurements, left-handed 18dB / K and right-handed 13dB / K often occur. The test results of left and right rotation are quite different, which affects the credibility of the test results.

[0006] (3) The test operation is inconvenient

However, because the antenna gain of telemetry equipment is generally small, the error of the measured noise power ratio is large

[0009] At present, most of the telemetry equipment is vehicle-mounted equipment. According to the task requirements, stations are often deployed in the field. Due to the lack of good field test conditions, or even a calibration tower, the G / T value cannot be measured by the calibration tower method. At the same time, the satellite source method There are also factors such as large antenna pointing error and satellite transmission frequency outside the working frequency band when measuring G / T value, so the operability is poor

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