METHOD FOR DETECTION OF SUBMINIATURE RADIO SIGNALS AND DEVICE FOR ITS REALISATION Russian patent published in 2009 - IPC H04B1/10 

FIELD: physics, radio.

SUBSTANCE: invention is related to radio engineering and may be used in radio receiving devices to detect subminiature radio signals. Method is based on application of two channels with identical resonant circuits and deduction process. Resonant circuits at the moment of time t₀ are excited by means of short-term and simultaneous supply of voltage, which is more than mean-square voltage of noise and interference in them. At the same time radio signal from antenna is supplied to both channels. Phases of inlet signals are serially modified in resonant circuits by means of phase shifts and introduction in channels with opposite signs. Upper envelopes of summary signals of resonance circuits - S_A1(t) and S_A2(t) are separated. Difference of these envelopes is defined - ΔS_A(t). When difference of envelopes achieves maximum value - ΔS_A, introduced phase shifts and are fixed. Useful coefficient is generated with amplitude x_m=ΔS_A/2(l-exp(-λ, t)), where λ is attenuation factor of circuits, and phase defined as mean average of phase shifts and taken with negative sign.

EFFECT: provision of possibility to receive radio signals beyond threshold of radio receiver sensitivity.

4 cl, 9 dwg