Direction finding interferometer internal calibration system
First Claim
1. An internal calibration system for use with a direction finding interferometer having a plurality or receiving antenna elements, a local oscillator, at least one phase meter, and a plurality of channel receiving means associated with each said receiving antenna element, each said channel receiving means including a radio-frequency preamplifier, a mixer connected to both said radio-frequency preamplifier and said local oscillator, and an internal intermediate-frequency amplifier connected to said mixer and one of said at least one phase meter, said internal calibrations system comprising:
- plural power dividers, each power divider having an input and first and second outputs, each power divider being associated with one of said channel receiving means, the second output of each power divider being operatively connected to the associated of said channel receiving means;
a master switch operatively connected to said power dividers for directing a calibrate signal to selected of said power dividers;
a signal source for providing the calibrate signal to said master switch;
at least one inter-channel transmission line switchably connected to the first output of each of two of said power dividers; and
secondary switching means associated with each power divider to permit the calibrate signal to bypass said power divider while passing from one of said at least one inter-channel transmission line to the associated channel receiving means.
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Accused Products
Abstract
An internal calibration system is provided for use with a direction finding interferometer which comprises a plurality of receiving antenna elements (A1, A2), a local oscillator (20), a master receiving channel means (41), a receiving channel means (42), and a phase meter (92). The internal calibration system comprises a master switch (22), a master power divider and switch assembly (31), a power divider and switch assembly (32), two transmission lines (M1, M2) connected to the master switch assemblies (31, 32), an inter-channel transmission line (T12) connected to the master power divider and switch assembly (31) and to the other power divider and switch assembly (32), and a plurality of couplers (51, 52).
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Citations
5 Claims
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1. An internal calibration system for use with a direction finding interferometer having a plurality or receiving antenna elements, a local oscillator, at least one phase meter, and a plurality of channel receiving means associated with each said receiving antenna element, each said channel receiving means including a radio-frequency preamplifier, a mixer connected to both said radio-frequency preamplifier and said local oscillator, and an internal intermediate-frequency amplifier connected to said mixer and one of said at least one phase meter, said internal calibrations system comprising:
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plural power dividers, each power divider having an input and first and second outputs, each power divider being associated with one of said channel receiving means, the second output of each power divider being operatively connected to the associated of said channel receiving means; a master switch operatively connected to said power dividers for directing a calibrate signal to selected of said power dividers; a signal source for providing the calibrate signal to said master switch; at least one inter-channel transmission line switchably connected to the first output of each of two of said power dividers; and secondary switching means associated with each power divider to permit the calibrate signal to bypass said power divider while passing from one of said at least one inter-channel transmission line to the associated channel receiving means. - View Dependent Claims (3, 4, 5)
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2. An internal calibration system for use with a direction finding interferometer having a plurality of receiving antenna elements, a local oscillator, at least one phase meter, and a plurality of channel receiving means associated with each said receiving antenna element, each said channel receiving means including a radio-frequency preamplifier, a mixer connected to both said radio-frequency preamplifier and said local oscillator, and an internal intermediate-frequency amplifier connected to said mixer and one of said at least one phase meter, said internal calibration system comprising:
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a signal source for providing a calibrate signal; plural master transmission lines, each adapted for transmitting the calibrate signal; a master switch for directing the calibrate signal provided by said signal source to selected of said master transmission lines; plural power dividers, each power divider having an input and first and second outputs, each power divider being connected to one of said master transmission lines so that the calibrate signal can be received as an input; at least one inter-channel transmission line switchably connected to the first output of ech of two of said power dividers; plural couplers, each coupler being associated with a channel receiving means and being adapted for coupling the calibrate signal from the second output of one of said power dividers into the associated of said channel receiving means between the included radio-frequency preamplifier and the associated antenna element; and secondary switching means associated with each power divider to permit the calibration signal to bypass said power divider while passing from one of said at least one inter-channel transmission line to the associated of said couplers.
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Specification