Radar, sonar and similar systems

Details Radar, sonar and similar systems Radar, sonar and similar systems

1984-10-25

1986-12-02

Tubbesing, T. H.

Communications: directive radio wave systems and devices (e.g.,

With particular circuit

For frequency modulation

367101, G01S 1328, G01S 1366

Patent

active

046268553

ABSTRACT:
A radar apparatus which includes a transmitter that generates a train of pulses arranged in groups of two, each group including a long pulse and a short pulse of different frequencies. These long and short pulses are separated in a receiver by a range gate which passes the pulses through the upper receiving channel when reflected from long ranges and the lower receiving channel when received from short ranges. The upper channel includes a filter which passes only the long pulses, which are frequency swept, and then compressed. The lower channel includes a filter which passes only the short pulses which are not frequency swept. The transmitter reverses the order of the pulses in adjacent groups. Alternatively, both the long and short pulses may be frequency swept. In either event there are adjacent pairs of swept pulses in contrast to known systems in which each swept pulse has immediately been preceded or followed by an unswept pulse.

REFERENCES:
patent: 3243814 (1966-03-01), Massey
patent: 3905033 (1975-09-01), Moore et al.
patent: 3945011 (1976-03-01), Glasgow
patent: 4096478 (1978-06-01), Chavez
patent: 4241347 (1980-12-01), Albanese et al.

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