Phase measurement ranging

Claim 2

A passive radar ranging apparatus for determining the instantaneous range to an emitter source comprising, in combination: receiving means for receiving a plurality of radiated electromagnetic energy, said received electromagnetic energy having a non-cooperative waveform and an unspecified frequency; translating means in communication with said receiving means for translating a first parameter of said received electromagnetic energy for detection and phase measurement; first resolving means in communication with said translating means for providing a plurality of distance oriented digital phase measurements, said phase measurements being determined directly from said received electromagnetic energy; second resolving means in communication with said translating means for resolving said first parameter and for providing said resolved first parameter to said first resolving means for utilization in providing said phase measurements; computing means connected to said first resolving means for receiving and manipulating said plurality of distance oriented digital phase measurements and for determining said instantaneous range to said emitter source of said radiated electromagnetic energy, and further including means for resolving phase ambiguities of said received electromagnetic energy wherein said phase measurements are available only from said emitter source and knowledge of relative motion between said emitter source and said receiving means is unknown; and displaying means for displaying said instantaneous range to said emitter source wherein said displayed instantaneous range is equivalent to R=[bc(c-b)(a 2 -φ 1 2 )/2a 2 (bφ 3 -cφ 2 )].

Claim 3

The radar ranging apparatus of claim 1 wherein said receiving means is comprised of a plurality of reception elements.

Claim 4

The radar ranging apparatus of claim 2 wherein said plurality of reception elements are aligned in a linear fashion, each reception element being spaced from an adjacent element by a spacing parameter.

Claim 5

The radar ranging apparatus of claim 1 wherein said receiving means is comprised of a plurality of antenna elements.

Claim 6

The radar ranging apparatus of claim 4 wherein each of said antenna elements is aligned in a straight line.

Claim 7

The radar ranging apparatus of claim 4 wherein each of said antenna elements is spaced from each adjacent element by a fixed spacing parameter.

Claim 8

The radar ranging apparatus of claim 1 wherein said plurality of radiated electromagnetic energy is received by said receiving means in a plurality of phase fronts.

Claim 9

The radar ranging apparatus of claim 7 wherein each of said plurality of phase fronts is located along a locus of points passing through one of a plurality of reception elements comprising said receiving means.

Claim 10

The radar ranging apparatus of claim 1 wherein said translating means comprises a plurality of frequency translators.

Claim 11

The radar ranging apparatus of claim 1 wherein said first resolving means comprises a plurality of phase resolvers.

Claim 12

The radar ranging apparatus of claim 1 wherein said second resolving means comprises a frequency resolver.

Claim 13

The radar ranging apparatus of claim 1 wherein said computing means comprises a digital computation system.

Claim 14

The radar ranging apparatus of claim 1 wherein each of said plurality of distance oriented digital phase measurements are transmitted to one of a plurality of primary adder circuits in said computing means.

Claim 15

The radar ranging apparatus of claim 13 wherein each of said primary adder circuits provides a sum of one of said distance oriented digital phase measurements and a corresponding phase correction value.

Claim 16

The radar ranging apparatus of claim 14 wherein each of said sums comprises a corrected phase signal.

Claim 17

The radar ranging apparatus of claim 1 wherein each of said distance oriented digital phase measurements is summed to a corresponding phase correction value for providing a plurality of corrected phase signals, each of said corrected phase signals being transmitted to one of a plurality of multiplier circuits.

Claim 18

The radar ranging apparatus of claim 16 wherein each of said corrected phase signals is multiplied by a plurality of apparatus spacing parameters stored in said multiplier circuits.

Claim 19

The radar ranging apparatus of claim 17 wherein each of said parameter corrected phase signals is transmitted from said multiplier circuits to one of a plurality of secondary adder circuits for adding a plurality of output signals of said multiplier circuits.

Claim 20

The radar ranging apparatus of claim 1 wherein said computing means further includes a divider circuit for receiving a pair of parameter corrected phase signals from a plurality of adders and multipliers located within said computing means.

Claim 21

The radar ranging apparatus of claim 19 wherein said divider circuit provides a fractional output signal, said fractional output signal being said instantaneous range to said emitter source.

Claim 22

The radar ranging apparatus of claim 1 wherein said computing means determines said instantaneous range to said emitter source providing an output signal, said output signal being transmitted to said displaying means for providing communication of said determined instantaneous range.

Claim 23

The radar apparatus of claim 1 wherein said computing means further includes a calibration means.

Claim 24

The radar ranging apparatus of claim 22 wherein said calibration means provides a phase correction value, said phase correction value being transmitted to each of a plurality of primary adder circuits.

Claim 25

The radar ranging apparatus of claim 1 further including a calibration signal generator in electrical communication with a calibrating means, said calibration signal generator for providing a correction signal.

Claim 26

The radar ranging apparatus of claim 24 wherein said correction signal provided by said calibration signal generator is transmitted to each of a plurality of receiving elements of said reception means.

Claim 27

The radar ranging apparatus of claim 1 wherein said displaying means is in electrical communication with a calibrating means, said displaying means for transmitting a plurality of parameters to said calibrating means.

Claim 28

The radar ranging apparatus of claim 26 wherein said transmitted plurality of parameters includes said instantaneous range to said emitter source.

Claim 29

A passive radar ranging system for determining the instantaneous range to an emitter source comprising, in combination: an antenna system for receiving a plurality of radiated electromagnetic energy, said received electromagnetic energy having a non-cooperative waveform and an unspecified frequency; a plurality of frequency translators in communication with said antenna system for translating a frequency parameter of said received electromagnetic energy for detection and phase measurement; a plurality of phase resolvers in communication with said plurality of frequency translators for providing a plurality of distance oriented digital phase measurements, said phase measurements being determined directly from said received electromagnetic energy; a frequency resolver in communication with one of said plurality of frequency translators for resolving said frequency parameter and for providing said resolved frequency parameter to each of said plurality of phase resolvers for utilization in providing said phase measurements; a computing system connected to said plurality of phase resolvers for receiving and manipulating said plurality of distance oriented digital phase measurements and for determining said instantaneous range to said emitter source of said radiated electromagnetic energy, and further including means for resolving phase ambiguities of said received electromagnetic energy wherein said phase measurements are available only from said emitter source and knowledge of relative motion between said emitter source and said receiving means is unknown; and a display device for displaying said instantaneous range to said emitter source wherein said displayed instantaneous range is equivalent to R=[bc(c-b)(a 2 -φ 1 2 )/2a 2 (bφ 3 -cφ 2 )].

Claim 30

A passive radar ranging system for determining the instantaneous range to an emitter source comprising, in combination: an antenna system for receiving a plurality of radiated electromagnetic energy, said received electromagnetic energy having a non-cooperative waveform and an unspecified frequency; a plurality of frequency translators in communication with said antenna system for translating a frequency parameter of said received electromagnetic energy for detection and phase measurement; a plurality of phase resolvers in communication with said plurality of frequency translators for providing a plurality of distance oriented digital phase measurements, said phase measurements being determined directly from said received electromagnetic energy; a frequency resolver in communication with one of said plurality of frequency translators for resolving said frequency parameter and for providing said resolved frequency parameter to each of said plurality of phase resolvers for utilization in providing said phase measurements; a computing system connected to said plurality of phase resolvers for receiving and manipulating said plurality of distance oriented digital phase measurements and for determining said instantaneous range to said emitter source of said radiated electromagnetic energy, and further including means for resolving phase ambiguities of said received electromagnetic energy wherein said phase measurements are available only from said emitter source and knowledge of relative motion between said emitter source and said receiving means is unknown; and a display device for displaying said instantaneous range to said emitter source wherein said displayed instantaneous range is equivalent to R=[bc(c-b)(a 2 -φ 1 2 )/2a 2 (bφ 3 -cφ 2 )].

Claim 31

The passive radar ranging system of claim 28 wherein said antenna system is comprised of a plurality of antenna elements.

Claim 32

The passive radar ranging system of claim 29 wherein said plurality of antenna elements are aligned in a linear fashion, each antenna element being spaced from an adjacent element by a fixed spacing parameter.

Claim 33

The passive radar ranging system of claim 28 wherein said plurality of radiated electromagnetic energy is received by said antenna system in a plurality of phase fronts.

Claim 34

The passive radar ranging system of claim 31 wherein each of said plurality of phase fronts is located along a locus of points passing through one of a plurality of antenna elements comprising said antenna system.

Claim 35

The passive radar ranging system of claim 28 wherein each of said plurality of distance oriented digital phase measurements are transmitted to one of a plurality of primary adder circuits in said computing system.

Claim 36

The passive radar ranging system of claim 33 wherein each of said primary adder circuits provides a sum of one of said distance oriented digital phase measurements and a corresponding phase correction value.

Claim 37

The passive radar ranging system of claim 34 wherein each of said sums comprises a corrected phase signal.

Claim 38

The passive radar ranging system of claim 28 wherein each of said distance oriented digital phase measurements is summed to a corresponding phase correction value for providing a plurality of corrected phase signals, each of said corrected phase signals being transmitted to one of a plurality of multiplier circuits.

Claim 39

The passive radar ranging system of claim 36 wherein each of said corrected phase signals is multiplied by a plurality of apparatus spacing parameters stored in said plurality of multiplier circuits.

Claim 40

The passive radar ranging system of claim 37 wherein each of said parameter corrected phase signals is transmitted from said multiplier circuits to one of a plurality of secondary adder circuits for adding a plurality of output signals of said plurality of multiplier circuits.

Claim 41

The passive radar ranging system of claim 28 wherein said computing system further includes a divider circuit for receiving a pair of parameter corrected phase signals from a plurality of adders and multipliers located within said computing system.

Claim 42

The passive radar ranging system of claim 39 wherein said divider circuit provides a fractional output signal, said fractional output signal being said instantaneous range to said emitter source.

Claim 43

The passive radar ranging system of claim 28 wherein said computing system determines said instantaneous range to said emitter source providing an output signal, said output signal being transmitted to said display device for providing communication of said determined instantaneous range.

Claim 44

The passive radar ranging system of claim 28 wherein said computing system further includes a calibrating means.

Claim 45

The passive radar ranging system of claim 42 wherein said calibrating means provides a phase correction value, said phase correction value being transmitted to each of a plurality of primary adder circuits.

Claim 46

The passive radar ranging system of claim 28 further including a calibration signal generator in electrical communication with a calibrating means, said calibration signal generator for providing a correction signal.

Claim 47

The passive radar ranging system of claim 44 wherein said correction signal provided by said calibration signal generator is transmitted to each of a plurality of antenna elements of said antenna system.

Claim 48

The passive radar ranging system of claim 28 wherein said display device is in electrical communication with a calibrating means, said display device for transmitting a plurality of parameters to said calibrating means.

Claim 49

The passive radar ranging system of claim 46 wherein said transmitted plurality of parameters includes said instantaneous range to said emitter source.