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Control systems for radar receivers
| Details |
Inventors: Lucchi, George A.;
Assignee: Sperry Corporation (New York, NY)
Primary Examiner: Tubbesing; T. H.
Assistant Examiner:
Attorney, Agent or Firm: Terry; Howard P.
An echo ranging weather radar system in which the bandwidth B of the radar receiver is made roughly equal to the bandwidth of the frequency spectrum of at least some expected weather echoes. In one embodiment, B T.sub.R is made equal to .alpha. during a time interval corresponding to a range increment at maximum range and during an earlier period corresponding to lower ranges, is varied inversely with range, where T.sub.R is the duration of an echo pulse which would be produced by a target of reference size, and .alpha. is a constant such as 1.2. In another embodiment, B is varied according to the duration T of actually received echo signals so as to set BT.congruent..alpha. during each echo reception interval, for different values of T. The gain of the receiver also may be varied with time. |
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DETAILED DESCRIPTION What is claimed is: 1.
In a return echo ranging system, comprising: means for transmitting a ranging signal; a receiver for receiving one or more echo signals from said ranging signal; means for sampling said echo signals according to a respective one of a plurality of predetermined receiver bandwidths, each one of said plurality of receiver bandwidths corresponding to a respective bandwidth portion of the frequency spectrum of an expected echo signal from subsequent ranging signals, to generate a sample signal indicative of the frequency spectrum bandwidth portion of such an expected echo signal; and means responsive to said sample signal for varying the bandwidth of said receiver to substantially match the bandwidth of the frequency spectrum of said expected echo signal.
2.
The apparatus according to claim 1 wherein said receiver comprises at least one resonant circuit which determines said bandwidth of said receiver, said resonant circuit including a variable resistor, and said bandwidth varying means comprises means for varying said variable resistor whereby said resonant circuit Q and said receiver bandwidth are varied.
3.
In a system as defined in claim 2 wherein said resonant circuit comprises an inductor, a capacitor and a variable resistance PIN diode connected to form a parallel resonant circuit with said inductor and capacitor, and wherein said bandwidth varying means comprises a voltage generator for generating a voltage that varies according to the range of said expected echo signals and means for applying said voltage to said PIN diode to bias said diode to vary the effective resistance thereof whereby the Q of the circuit is increased and the bandwidth of said circuit is reduced as the range of said expected echo signals increases.
4.
In a system as defined in claim 1 further including means for varying the gain of said receiver as a function of time.
5.
In a system as defined in claim 1 wherein said sampling means includes sequential storage means for storing signals having one of each of said plurality of predetermined bandwidths and further includes means for coupling received echo signals according to each respective bandwidth to one of said sequential storage means in sequence so that each of said sequential storage means stores signals indicative of a respective set of echo signals received in response to each ranging signal, each set of echo signals corresponding to a respective one of said predetermined bandwidths
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