| 摘要 |
1. An electromagnetic detection system with pulse compression which can be preferably employed for realizing a laser telemeter device, comprising, on the emission side, a generator (9) for producing periodical pulses which are modulated by frequency, said generator being connected to a generator (4) for producing electromagnetic waves, and comprising, on the reception side, a mixer (10) which is fed by a local wave issued from the electromagnetic wave generator and which is connected via an adapted filter (11, 12, 13, 14) of the dispersion type to a detection circuit (29) followed by a measuring circuit (50) which determines the distance and the Doppler frequency of a detected target, characterized in that the pulse generator (9), at the beginning of each period, delivers a couple of pulses to a group of dispersion type filters constituted by at least two pairs of frequency dependent variable delay lines, the pulses of a couple being applied respectively to the lines (5-6) of a first pair and, at the next following emission period, to the lines (7-8) of the second pair and so on, each pair of frequency dependent variable delay lines being constituted of lines having the same slope value (K) but opposite sign, the slope value (K, K') differing from one pair to the other, the thus treated pulses of a couple being called conjugate pulses, the adapted filter comprising an arrangement of conjugately used lines (11-12, 13-14) identical to the arrangement on the emission side for compressing the received echos, that means that the pulses of a having been treated on the emission side by passing through a line of a given slope is treated on the reception side by passing through that line of the adapted filter which presents the same slope value but opposite sign ; and that the measuring circuit (150) comprises in a series configuration : counting means (30) for counting the delays between the emission instant and the reception instants of the echos sent back from each target, and storage (34-35) and computer means (36) for computing the distance and the Doppler frequency of each detected target and for storing the different possible values of each period and for discriminating the real values by comparison of the computed results and by selection of the unmodified values after at least two periods of operation. |
