| 摘要 |
1. Deviation measurement receiver (R) for secondary radar of the type comprising two input channels (S, D) receiving the pulse signals furnished by a reception antenna, one of said channels receiving a sum signal (S) and the other receiving a difference signal (D) ; said receiver comprises two receiver chains (1, 2) formed by elements in parallel and a common local oscillator (A), each receiver chain (1, 2) comprising a preselector (B1, B2) fed by one of the input channels receiving a wave with a first predetermined frequency, followed by a preamplifier (C1, C2) injecting the filtered and preamplified wave into a mixer (D1, D2), this mixer (D1, D2) receiving a second wave with a second predetermined frequency, the latter coming from the local oscillator (A), the mixer (D1, D2) furnishing a wave with a frequency equal to the difference between the first and second frequencies, the wave then being preamplified by a preamplifier (E1, E2), then filtered by a filter (F1, F2), then amplified by a logarithmic amplifier (G1, G2), the two receiver chains (1, 2) having respectively, on the first chain 1, an output furnishing a signal (SF1) with carrier wave and an output furnishing a demodulated signal (SD) and, on the second chain 2, an output furnishing a demodulated signal (DD) ; the deviation measurement receiver is characterized in that it also comprises systematic error correction means (CE) comprising an error correction table (L, M) loaded on the basis of measurements giving the real position of the target and the position given by the reading of the deviation measurement voltage furnished by the conventional receiver ; said measurements originate from a preceding standardization for different positions of the target and said error correction means (CE) being connected to the outputs (SD, DD, SFI) of the two receiver chains (1, 2). |
