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This paper proposed a low probability of identification (LPID) radar signal parameter interval design method to control recognition probability in intercept receiver. The method introduced in this paper use identification capacity theory to study recognition process in intercept receiver. The relationship between identification capacity and error recognition probability is established. Then, the radiation...
Aiming at the problem that the active echo cancellation system delay may decrease cancellation effect, this paper analyses cancellation effect for linear frequency modulation signal with joint consideration of system delay as well as amplitude error and phase error. The mathematical model is established based on the generation process of the cancellation signal. The expression of cancellation gain...
This paper presents a waveform selection criterion for the purpose of low probability of interception (LPI). As various signal processing methods can be employed by channelized receivers, here we use the obtained amount of information from a specific transmitted waveform in interceptors to describe the LPI performance of the transmitted waveform. In this paper, the Shannon entropies of the received...
In this paper, based on the field-frequency lock technology commonly used in the current commercial nuclear magnetic resonance spectrometers to maintain the magnetic field homogeneity and the theory of weak signal detection, a lock preamplifier at the front-end of lock channel is designed and implemented. The preamplifier consists of broadband amplifier, RF switch and attenuation circuits. In the...
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