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RF Receivers

RF receivers are commonly used in many industries today for a variety of applications. Oneexample of an RF receiver, the GT-87, is used in commercial, industrial, and military applications. This article will discuss the GT-87’s application field and working principle.

Application Field

The GT-87 is a high-performance, direct-conversion receiverwith wideband IF/RF signal demodulation. It is composed ofadaptive frequency-hopping receivers, direct-digital synthesizers, and digital downconverters and operates in the frequency band from 1 MHz to 5 GHz. The GT-87 works for a variety of applications ranging from satellite communications, military communications, data acquisition, and radar systems. It is able to demodulate wideband signals and can flexibly tune the baseband signal bandwidth. Also, the GT-87 can accurately identify moving targets and can counter frequent interference or signal fading.

Working Principle

The GT-87 is an all-digital RF receivered with a direct-conversion demodulation technique. The direct-conversion demodulation technique includes the use of a direct-digital synthesizer, which is responsible for generating the radio-frequency signal, as well as the baseband signal. The first step in the process is to generate the RF signal by programming the direct-digital synthesizer. Next, the received signal passes through the IF filter. After passing through the IF filter, the signal is digitized by the Analog-to-Digital Converter (ADC). This digitized signal is then down-converted to the baseband frequency using the direct-digital synthesizer. Finally, the signal is demodulated with a digital signal processor to extract the payload information.

To ensure optimal performance, the GT-87 employs power control and adaptive thresholding techniques. The power control technique automatically adapts the RF power level to achieve a certain signal-to-noise ratio in order to maximize demodulation quality. On the other hand, the adaptive thresholding technique helps to reduce error rates in the demodulation process. Finally, the GT-87 receiver also utilizes extended Kalman filter algorithm in order to accurately estimate and track moving targets.

Conclusion

The GT-87 is a high-performance, all-digital receiver designed for a variety of applications. It can be used in satellite communications, military communications, data acquisition, and radar systems. Its direct-conversion demodulation technique includes a direct-digital synthesizer, IF filter, ADC, and digital signal processor. Power control and adaptive thresholding techniques are used to ensure optimal performance. Finally, extended Kalman filter algorithm is used to track moving targets. With its wide applicability and flexible parameters, the GT-87 is an important component in RF receivers.

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