(0)G01S:3/4:

(0)G01S:3/4:

IPC6

SECTION G - PHYSICS

RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING...

G01S

4/5

G01S011/00 - G01S013/95

11

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00

Systems for determining distance or velocity not using reflection or reradiation (direction-finders G 01 S 3/00; position-fixing by co-ordinating two or more distance determinations G 01 S 5/00) [2]

using radio waves [5]

using angle measurements [5]

using intensity measurements [5]

using synchronised clocks (synchronisation of electronic clocks G 04 G 7/02) [5]

using Doppler effect [5]

using electromagnetic waves other than radio waves [5]

using ultrasonic, sonic or infrasonic waves [5]

using difference in transit time between electromagnetic and sonic waves [5]

Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified (using acoustic waves G 01 S 15/00 ; using electromagnetic waves other than radio waves G 01 S 17/00) [3]

Notes

(1)	This group covers:

-

systems for detecting the presence of an object, e.g. by reflection or reradiation from the object itself, or from a transponder associated with the object, for determining the distance or relative velocity of an object, for providing a co-ordinated display of the distance and direction of an object or for obtaining an image thereof; [3]

-	systems arranged for mounting on a moving craft or vehicle and using the reflection of waves from an extended surface external to the craft, e.g. the surface of the earth, to determine the velocity and direction of motion of the craft relative to the surface. [3]

(2)	This group does not cover:

-	systems for determining the direction of an object by means not employing reflection or reradiation, which are covered by groups G 01 S 1/00 or G 01 S 3/00; [3]

-	systems for determining distance or velocity of an object by means not employing reflection or reradiation, which are covered by group G 01 S 11/00. [3]

Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems [3]

Systems determining presence of a target (based on relative movement of target G 01 S 13/56) [3]

Systems determining position data of a target [3]

Systems for measuring distance only (indirect measurement G 01 S 13/46) [3]

using transmission of interrupted pulse modulated waves (determination of distance by phase measurement G 01 S 13/32) [3]

wherein the pulse-recurrence frequency is varied to provide a desired time relationship between the transmission of a pulse and the receipt of the echo of a preceding pulse [3]

wherein a voltage or current pulse is initiated and terminated in accordance respectively with the pulse transmission and echo reception [3]

using counters [3]

wherein range gates are used [3]

whereby multiple time-around echos are used or eliminated [3]

using irregular pulse repetition frequency [3]

using frequency agility of carrier wave [3]

wherein the transmitted pulses use a frequency- or phase-modulated carrier wave [3]

with time compression of received pulses [3]

using more than one pulse per radar period [3]

using transmission of continuous unmodulated waves, amplitude-, frequency- or phase-modulated waves [3]

using transmission of frequency-modulated waves and the received signal, or a signal derived therefrom, being heterodyned with a locally-generated signal related to the contemporaneous transmitted signal to give a beat-frequency signal [3]

with phase comparison between the received signal and the contemporaneously transmitted signal [3]

wherein more than one modulation frequency is used [3]

wherein the frequency of transmitted signal is adjusted to give a predetermined phase relationship [3]

Simultaneous measurement of distance and other coordinates (indirect measurement G 01 S 13/46) [3]

Monopulse radar, i.e. simultaneous lobing [3]

Indirect determination of position data [3]

using multiple beams at emission or reception [3]

Systems of measurement based on relative movement of target [3]

Discriminating between fixed and moving objects or between objects moving at different speeds [3]

using transmissions of interrupted pulse modulated waves [5]

based upon the phase or frequency shift resulting from movement of objects, with reference to the transmitted signals, e.g. coherent MTi (coherent receivers G 01 S 7/288) [5]

performing filtering on the whole spectrum without loss of range information, e.g. using delay line cancellers or comb filters [5]

with elimination of blind speeds [5]

performing filtering on a single spectral line and associated with one or more range gates with a phase detector or a frequency mixer to extract the Doppler information, e.g. pulse Doppler radar [5]

using a bank of range gates or a memory matrix [5]

based upon amplitude or phase shift resulting from movement of objects, with reference to the surrounding clutter echo signal, e.g. non-coherent MTi, clutter referenced MTi, externally coherent MTi [5]

using transmission of continuous unmodulated waves, amplitude-, frequency-, or phase-modulated waves [5]

eliminating objects that have not moved between successive antenna scans, e.g. area MTi [5]

for presence detection [3]

Velocity or trajectory determination systems; Sense-of-movement determination systems [3]

wherein the transmitter and receiver are mounted on the moving object, e.g. for determining ground speed, drift angle, ground track (G 01 S 13/64 takes precedence) [3]

Sense-of-movement determination [3]

Velocity measuring systems using range gates [3]

Radar-tracking systems; Analogous systems [3]

for angle tracking only [3]

for range tracking only [3]

for two-dimensional tracking, e.g. combination of angle and range tracking, track-while-scan radar [3]

Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems [3,6]

using transponders powered from received waves, e.g. using passive transponders [6]

wherein pulse-type signals are transmitted [3]

discriminating between different kinds of targets, e.g. IFF-radar, i.e. identification of friend or foe (G 01 S 13/75, G 01 S 13/79 takes precedence) [3]

Systems using random coded signals or random pulse repetition frequencies [6]

(transferred to G 01 S 13/75, G 01 S 13/79)

wherein continuous-type signals are transmitted [3]

for distance determination by phase measurement [3]

Combinations of radar systems with non-radar systems, e.g. sonar, direction finder [3]

Combinations of radar systems, e.g. primary radar and secondary radar [3]

Radar or analogous systems, specially adapted for specific applications (G 01 S 13/89 to G 01 S 13/95 take precedence; electromagnetic prospecting or detecting of objects, e.g. near-field detection, G 01 V 3/00) [3,6]

Radar or analogous systems, designed for mapping or imaging [3]

using synthetic aperture techniques [3,6]

Radar or analogous systems, designed for traffic control (G 01 S 13/93 takes precedence) [3]

for velocity measurement [3]

Radar or analogous systems, designed for anti-collision purposes [3]

Radar or analogous systems, designed for terrain-avoidance [3]

Radar or analogous systems, designed for meteorological use [3]

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