System for automatically generating smoothing parameters in an automatic track-while-scan radar system

Claim 2

In a track-while-scan radar system wherein video signals from a target are received in at least some of a series of sequential radar scans directed at said target, said radar system including means for processing each of said video signals to provide target position information and track-while-scan means for operating upon target position information successively processed to automatically derive smoothed target position and velocity values for said target and signals indicative of the target''s position at a succeeding scan, a system for automatically generating at least a velocity smoothing parameter comprising: means for generating a variable smoothing term Tau as a function of at least the time between successive scans Tscan, the time between successive scans providing video signals from said target Delta t, a variable smoothing term Tau n 1 generated by said means during a preceding operation; and dividing means responsive to Tau n and Delta t for generating a variable smoothing velocity parameter Beta , whereby Beta Delta t/ Tau n.

Claim 3

In a track-while-scan radar system wherein video signals from a target are received in at least some of a series of sequential radar scans directed at said target, said radar system including means for processing each of said video signals to provide target position information and track-while-scan means for operating upon target position information successively processed to automatically derive smoothed target position and velocity values for said target and signals indicative of the target''s position at a succeeding scan, a system for automatically generating at least a velocity smoothing parameter comprising: means for generating a variable smoothing term Tau as a function of at least the time between successive scans Tscan, the time between successive scans providing video signals from said target Delta t, a variable smoothing term Tau n 1 generated by said means during a preceding operation; and dividing means responsive to Tau n and Delta t for generating a variable smoothing velocity parameter Beta , whereby Beta Delta t/ Tau n.

Claim 4

The system defined in claim 2 further including means responsive to said variable smoothing term Tau n, the time Tscan times an integer n and signals representing different modes of processing said video signals to generate a position smoothing parameter Alpha as a function thereof.

Claim 5

In a track-while-scan radar system including means for scanning a target with a series of scans, means for receiving video signals from the target in response to at least some of said scans, means for processing the video signals from each scan to derive measured target position informaTion, track-while-scan means including means for correlating the measured target position information with previously predicted position information stored in said storing means to track said target, said correlation being in accordance with any one of a number of correlation modes, including a manual mode of correlation and first and second automatic correlation modes, said track-while-scan means further including means for updating the position of said target by providing smoothed target position information as a function of the measured target position information, previously smoothed target position information and smoothing parameters, the improvement comprising: first generating means for generating a variable smoothing term Tau n as a function of a previously generated variable smoothing term Tau n 1, the time between successive scans Tscan, the time between scans producing video signals from the target, Delta t, and first, second and third signals representing said correlation as being in manual, first and second automatic modes respectively; means for storing said generated variable smoothing term Tau n for use in generating a subsequent variable smoothing term Tau n 1; second generating means responsive to said generated variable smoothing term Tau n and the time between scans producing video signals from the target Delta t for generating a velocity smoothing parameter Beta n where Beta n Delta t/ Tau n; and third generating means responsive to said variable smoothing term Tau n and said first, second and third signals for generating a position smoothing parameter Alpha n as a function thereof.

Claim 6

In a track-while-scan radar system including means for scanning a target with a series of scans, means for receiving video signals from the target in response to at least some of said scans, means for processing the video signals from each scan to derive measured target position informaTion, track-while-scan means including means for correlating the measured target position information with previously predicted position information stored in said storing means to track said target, said correlation being in accordance with any one of a number of correlation modes, including a manual mode of correlation and first and second automatic correlation modes, said track-while-scan means further including means for updating the position of said target by providing smoothed target position information as a function of the measured target position information, previously smoothed target position information and smoothing parameters, the improvement comprising: first generating means for generating a variable smoothing term Tau n as a function of a previously generated variable smoothing term Tau n 1, the time between successive scans Tscan, the time between scans producing video signals from the target, Delta t, and first, second and third signals representing said correlation as being in manual, first and second automatic modes respectively; means for storing said generated variable smoothing term Tau n for use in generating a subsequent variable smoothing term Tau n 1; second generating means responsive to said generated variable smoothing term Tau n and the time between scans producing video signals from the target Delta t for generating a velocity smoothing parameter Beta n where Beta n Delta t/ Tau n; and third generating means responsive to said variable smoothing term Tau n and said first, second and third signals for generating a position smoothing parameter Alpha n as a function thereof.

Claim 7

The system defined in claim 4 wherein said first generating means includes fourth means for generating Alpha n as a function of Alpha n 1, Tscan and Delta t when said correlation is in a manual mode.

Claim 8

The system defined in claim 5 wherein said fourth means includes a first comparator for providing a first output signal of a first binary state when Tau n 1 is equal or greater than Tscan and of a second binary state when Tau n 1 is smaller than Tscan, a second comparator controllable by the first output signal of a first binary state to provide a second output signal of a first binary state when Delta t supplied thereto is equal or greater than the term Tau n 1 compared therein, and to provide a second output signal of a second binary state when Delta t is smaller than Tau n 1 and means responsive to signals Tau n 1, Tscan and the binary states of said first and second output signals for providing an output Tau n Tau n 1 when Delta t Tau n 1 Tscan where indicates equal or greater, an output Tau n Delta t when Tau n 1 is equal or greater than Tscan and greater than Delta t and an output Tau n Tscan when Tau n 1 Tscan.

Claim 9

The system defined in claim 4 wherein said first generating means includes fifth means for generating Tau n as a function of 1/2( Tau n 1), Delta t and 4Tscan, when said correlation is in said first automatic mode.

Claim 10

The system defined in claim 7 wherein said fifth means comprise first and second comparators for comparing the value of 1/2( Tau n 1) with Delta t and 4Tscan respectively and means responsive to the signals 1/2( Tau n 1), Delta t, 4Tscan and outputs of said first and second comparators for providing an output of Tau n 1/2 Tau n 1 when 4Tscan 1/2 Tau n 1 Delta t, Tau n 4Tscan when 1/2 Tau n 1 Delta t and greater than 4Tscan AND Tau n Delta t when Delta t>1/2 Tau n 1.

Claim 11

The system defined in claim 4 wherein said first generating means includes sixth means for generating Tau n as a function of signals Tau n 1, Delta t, 8(Tscan) when said correlation is in said second automatic mode.

Claim 12

The system defined in claim 9 wherein said sixth means comprise an adder for providing the sum of the values of Tau n 1 and Delta t; comparing means for providing an output of a first binary value when 8Tscan is equal or greater than Tau n 1+ Delta t; and means responsive to the output of said comparing means said 8(Tscan) and Tau n 1+ Delta t, for providing an output Tau n Tau n 1+ Delta t when 8Tscan Tau n 1+ Delta t and an output of Tau n 8Tscan when Tau n 1+ Delta t>8Tscan.

Claim 13

The system defined in claim 4 wherein said first generating means includes a plurality of comparing means, logic and gating circuitry responsive to said first, second and third signals and signals representing the following values Delta t, Tscan, 4Tscan, 8Tscan, Tau n 1 and 1/2( Tau n 1) for providing an output of Tau n Tau n 1 with Tau n not greater than Delta t and not smaller than Tscan when said correlation is in said manual mode, indicative by said first signal, an output of Tau n Tau n 1+ Delta t with Tau n not greater than 8Tscan and not smaller than Delta t when said correlation is in said second automatic mode indicative by said third signal and an output of Tau n 1/2 Tau n 1 with Tau n not greater than 4Tscan and not smaller than Delta t when said correlation is in said first automatic mode indicative by said second signal.

Claim 14

The system defined in claim 11 wherein said second generating means comprise dividing means responsive to said smoothing term Tau n generated in said first generating means and said Delta t signal for generating said velocity smoothing parameter Beta n by dividing Delta t by Tau n, and herein said third generating means include a comparator for comparing the value of Tau n with 4(Tscan) and provide a first binary signal when 4Tscan is equal to or greater than Tau n means for generating a value of unity; means for generating a value of 1/2 unity; and gating means responsive to said first, second and third signals representing the correlation modes for providing a position smoothing parameter Alpha of unity when said correlation is in said manual or second automatic modes, the value of Alpha when said correlation is in said first automatic mode being unity when 4Tscan Tau n and 1/2 unity when Tau n is greater than 4Tscan.

Claim 15

A process according to claim 7 wherein said inhibitor is formaldehyde.

Claim 16

A bleaching composition consisting essentially of on a weight basis (I) from about 0.1 percent to about 15 percent of hydroxylamine salt as inhibitor compound capable of inhibiting enzyem-induced decomposition of water soluble inorganic peroxide bleaching agent and (II) a substance selected from the group consisting of (a) from about 2 percent to about 85 percent of a water soluble inorganic peroxide bleaching agent, (b) from about 5 percent to about 90 percent of a water soluble organic detergent and (c) mixtures of (a) and (b) with the proviso that in the case of mixtures of (a) and (b), at least about 10 percent being each of bleaching agent and detergent.

Claim 17

A bleaching composition consisting essentially of on a weight basis (I) from about 0.1 percent to about 15 percent of hydroxylamine salt as inhibitor compound capable of inhibiting enzyem-induced decomposition of water soluble inorganic peroxide bleaching agent and (II) a substance selected from the group consisting of (a) from about 2 percent to about 85 percent of a water soluble inorganic peroxide bleaching agent, (b) from about 5 percent to about 90 percent of a water soluble organic detergent and (c) mixtures of (a) and (b) with the proviso that in the case of mixtures of (a) and (b), at least about 10 percent being each of bleaching agent and detergent.

Claim 18

A composition according to claim 21 wherein said substance is selected from the group consisting of from about 2 percent to about 85 percent of a water soluble inorganic peroxide bleaching agent and mixtures of from about 10 percent to about 85 percent of a water soluble inorganic peroxide bleaching agent with from about 10 percent to about 99 percent of a water1soluble organic detergent.

Claim 19

A composition according to claim 21 wherein said bleaching agent is sodium perborate tetrahydrate.

Claim 20

A composition according to claim 21 wherein said bleaching agent is sodium perborate monhydrate. and therefore the output of inverter 54 is true, enabling gate 55 to pass therethrough a multibit number representing 8Tscan to another input of Or gate

Claim 21

Gate 59, similar to gate 49 hereinbefore described, is assumed to represent a plurality of OR gates, the combination of which provides a multibit output signal which is supplied to a plurality of AND gates, one of which is designated by numeral 59x. Each of the AND gates 59x is provided with an enabling signal generally designated OG representing that the track-while-scan system is operable in the automatic mode with a nonmaneuverable correlation gate. Thus the output of AND gate 59x when the system is operable in such a correlation mode is either the output of gate 53 which is Tau n 1+ Delta t or 8Tscan. In a similar manner, the circuitry diagrammed in FIG. 6, to which reference is made herein, responsive to signals Delta t and 1/2 Tau n 1, provides an output Tau n which is one of the three values shown in lines R6, R7, and R8 in the chart of FIG. 2 when the track-while-scan system is operable in an automatic correlation mode using a maneuver gate, which in FIG. 6 is represented by the signal 3G. The circuitry of FIg 6 is shown to include a comparator 61 providing a true output signal when 1/2 Tau n 1 is equal to or greater than Delta t and a comparator 62 providing a true output signal when he one input thereof 4Tscan is equal to or greater than another input of 1/2 Tau n 1. The output of comparator 61 is connected to control the operation of comparator 61 as well as to an inverter 62 while the output of comparator 62 is connected to control a gate 64 and an inverter

Claim 22

Gate 59, similar to gate 49 hereinbefore described, is assumed to represent a plurality of OR gates, the combination of which provides a multibit output signal which is supplied to a plurality of AND gates, one of which is designated by numeral 59x. Each of the AND gates 59x is provided with an enabling signal generally designated OG representing that the track-while-scan system is operable in the automatic mode with a nonmaneuverable correlation gate. Thus the output of AND gate 59x when the system is operable in such a correlation mode is either the output of gate 53 which is Tau n 1+ Delta t or 8Tscan. In a similar manner, the circuitry diagrammed in FIG. 6, to which reference is made herein, responsive to signals Delta t and 1/2 Tau n 1, provides an output Tau n which is one of the three values shown in lines R6, R7, and R8 in the chart of FIG. 2 when the track-while-scan system is operable in an automatic correlation mode using a maneuver gate, which in FIG. 6 is represented by the signal 3G. The circuitry of FIg 6 is shown to include a comparator 61 providing a true output signal when 1/2 Tau n 1 is equal to or greater than Delta t and a comparator 62 providing a true output signal when he one input thereof 4Tscan is equal to or greater than another input of 1/2 Tau n 1. The output of comparator 61 is connected to control the operation of comparator 61 as well as to an inverter 62 while the output of comparator 62 is connected to control a gate 64 and an inverter

Claim 23

Inverter 63 controls the operation of a gate 66 while inverter 65 controls the operation of a gate 67 through an AND gate 68 having another input thereof connected to the output of comparator 61. Each of gates 64, 66 and 67 is operable to pass an input signal thereto only when the control signal supplied thereto is true. Thus when the output of comparator 61 is false, i.e. Delta t is greater than 1/2 Tau n 1, the output of inverter 63 s true thereby enabling gate 66 to pass therethrough itS input of Delta t. Similarly, gate 64 passes therethrough its input signal 1/2 Tau n 1 only when the output of comparator 62 is true. On the other hand, when the output of comparator 61 is true and the output of comparator 62 is false, the two inputs to AND gate 68 are true and thereby gate 67 is enabled to pass therethrough the input of 4Tscan. The outputs of the three gates are supplied to a plurality of OR gates 69, one of which is shown in FIG. 6. The output of OR gate 69 represents the value Tau n which is supplied to a plurality of AND gates 69x, one of which is shown in FIg. 6. Each one of the ANd gates 69 is controlled by the signal 3G indicating that the system is operable in an automatic correlation mode with a maneuverable correlation gate. Thus AND gates 69x provide the variable smoothing term Tau n only when the system is in the automatic correlation mode with the maneuverable correlation gate, with the output the value of Tau n being one of the values of the three gates in FIG. 6. Reference is now made to FIG. 7 wherein multigates 49, 59 and 69 are shown connected to their respective ANd gates 49x, 59x, 69x. From the foregoing description, it should be apparent that the gates represented by gate 49x provide a Tau n output when the system is operable in a manual mode of correlation while gates 59x or 69x provide Tau n outputs when the system is operable in an automatic mode of correlation when a nonmaneuverable or maneuverable correlation gates are employed respectively. The outputs of multigates 49x, 59x and 69x are supplied to a plurality of OR gates 71x one of which is shown in FIG. 7. Thus the output of OR gates 71x is a multibit value representing Tau n. In addition to the foregoing described circuitry, the circuitry necessary for generating Tau n also includes an additional OR gate 72 having three inputs to which signals representing the manual, as well as the two automatic modes of operation, are provided. Only when all the three inputs thereof are false, indicating that the system is neither operating in a manual mode nor operating with either of the two correlation gates 0G and 36, does the OR gate 72 provide a false output representing Tau n equal to zero which passes through OR gates 71x to represent a Tau n value of zero. During initiation of track, until sufficient measurements are obtained for correlation, the gate 72 maintains Tau n equal to zero allowing the smoothing operation to start from zero or with very light smoothing. The output of OR gate 71x representing the value of Tau n is supplied together with a value representing Delta t to a divider circuit 73 which divides Delta t by Tau n to produce the velocity smoothing parameter Beta hereinbefore referred to. It should be appreciated however that since in equation (2) in which Beta is employed, it is divided by Delta t instead of generating the term Beta , and then dividing it by Delta t, the term 1/ Tau n may be employed in equation (2) since 1/ Tau n Beta / Delta t. However hereafter for explanatory purposes, it will be assumed that the parameter Beta is generated in order to complete the description of the novel system of the invention for generating velocity and position smoothing parameters. Reference is now made to FIG. 8 which is a block diagram for generating the position smoothing parameter Alpha . As herebefore described in conjunction with the chart shown in FIG. 3, the position smoothing parameter Alpha is generated as a function of the particular correlation mode and the relative value of Tau n with respect to 4Tscan. When correlation is in either the manual mode or an automatic correlation mode with a maNeuver gate, the value of Alpha is equal to unity. On the other hand, if correlation is automatic with a nonmaneuver gate, the value of Alpha is either unity or 1/2 unity, the latter value being generated when Tau n is greater than 4Tscan. In accordance with the teachings of the present invention, the circuitry is provided to generate Alpha which includes a comparator 81 provided with signals representing Tau n and 4Tscan. The output of comparator 81 is true when 4Tscan is equal to or greater than Tau n. This output is supplied to an ANd gate 82 as well as to an inverter 83. A signal representing automatic correlation with a nonmaneuver gate, designated 0G, is supplied to the other input of AND gate 82 as well as to an AND gate 84 provided with the output of inverter 83, with the output of the latter gate being supplied to a circuit 85 which is designated as a 1/2 value unit. Briefly, the function of circuit 85 is to provide an output which represents the value 1/2 being enabled by the true output of gate 84. The circuitry for generating Alpha also includes a circuit 86 which provides an output of unity when enabled by the output of an OR gate 87 having one of its input terminals connected to the output gate 82 and two other input terminals supplied with signals representing manual and automatic correlation in a maneuver gate, designated by 3G. From the foregoing, it should be appreciated that circuit 86 provides an output representing unity when correlation is in either manual or automatic correlation in a maneuver gate as well as when correlation is in an automatic nonmaneuver gate (signal 0G) and 4Tscan is equal to or greater than Tau n as indicated when the output of AND gate 82 is true. On the other hand, if when operated in an automatic nonmaneuver gate and the output of comparator 81 is false, the output of inverter 83 will be true and therefore the two input signals to ANd gate 84 will be true. Consequently, circuit 85 will be enabled to provide an output which represents the value of half unity. The output of circuits 85 and 86 are supplied to an OR gate 88, the output of which represents the position smoothing term Alpha . Although, herebefore, specific circuitry has been described for generating the term Tau n and therefrom the velocity and position smoothing parameters Beta and Alpha respectively, it should be appreciated to those familiar with the art that the arithmetic operations necessary to generate these parameters may be performed by the computer, employed in every automatic track-while-scan system. This may be accomplished by writing a specific computer program so that before the velocity and position smoothing parameters are to be incorporated in the track-while-scan equations, the smoothing term is first generated in accordance with the teachings hereinbefore described. Reference is now directed to FIG. 9 which is a flow diagram of a program which may be used to generate the term Tau n in accordance with the teachings hereinbefore described. The diagram is presented in a manner well familiar to those skilled in the art of computer programming. Similarly, FIG. 10 represents a flow diagram of a computer program necessary for generating Alpha in accordance with the teachings of the present invention. The teachings of generating variable velocity and position smoothing parameters may further be highlighted by the following examples. For the first example, let it be assumed that a blip to scan history may be represented by the following line (moving from left to right) wherein the ones represent hits and the zeros represent misses: 1 1 1 1 1 0 0 1 0 1 1 1 1 1 It is assumed that all correlation is in the automatic mode in a nonmaneuver gate (0G) and that Tscan is ten seconds. For the first

Claim 24

Inverter 63 controls the operation of a gate 66 while inverter 65 controls the operation of a gate 67 through an AND gate 68 having another input thereof connected to the output of comparator 61. Each of gates 64, 66 and 67 is operable to pass an input signal thereto only when the control signal supplied thereto is true. Thus when the output of comparator 61 is false, i.e. Delta t is greater than 1/2 Tau n 1, the output of inverter 63 s true thereby enabling gate 66 to pass therethrough itS input of Delta t. Similarly, gate 64 passes therethrough its input signal 1/2 Tau n 1 only when the output of comparator 62 is true. On the other hand, when the output of comparator 61 is true and the output of comparator 62 is false, the two inputs to AND gate 68 are true and thereby gate 67 is enabled to pass therethrough the input of 4Tscan. The outputs of the three gates are supplied to a plurality of OR gates 69, one of which is shown in FIG. 6. The output of OR gate 69 represents the value Tau n which is supplied to a plurality of AND gates 69x, one of which is shown in FIg. 6. Each one of the ANd gates 69 is controlled by the signal 3G indicating that the system is operable in an automatic correlation mode with a maneuverable correlation gate. Thus AND gates 69x provide the variable smoothing term Tau n only when the system is in the automatic correlation mode with the maneuverable correlation gate, with the output the value of Tau n being one of the values of the three gates in FIG. 6. Reference is now made to FIG. 7 wherein multigates 49, 59 and 69 are shown connected to their respective ANd gates 49x, 59x, 69x. From the foregoing description, it should be apparent that the gates represented by gate 49x provide a Tau n output when the system is operable in a manual mode of correlation while gates 59x or 69x provide Tau n outputs when the system is operable in an automatic mode of correlation when a nonmaneuverable or maneuverable correlation gates are employed respectively. The outputs of multigates 49x, 59x and 69x are supplied to a plurality of OR gates 71x one of which is shown in FIG. 7. Thus the output of OR gates 71x is a multibit value representing Tau n. In addition to the foregoing described circuitry, the circuitry necessary for generating Tau n also includes an additional OR gate 72 having three inputs to which signals representing the manual, as well as the two automatic modes of operation, are provided. Only when all the three inputs thereof are false, indicating that the system is neither operating in a manual mode nor operating with either of the two correlation gates 0G and 36, does the OR gate 72 provide a false output representing Tau n equal to zero which passes through OR gates 71x to represent a Tau n value of zero. During initiation of track, until sufficient measurements are obtained for correlation, the gate 72 maintains Tau n equal to zero allowing the smoothing operation to start from zero or with very light smoothing. The output of OR gate 71x representing the value of Tau n is supplied together with a value representing Delta t to a divider circuit 73 which divides Delta t by Tau n to produce the velocity smoothing parameter Beta hereinbefore referred to. It should be appreciated however that since in equation (2) in which Beta is employed, it is divided by Delta t instead of generating the term Beta , and then dividing it by Delta t, the term 1/ Tau n may be employed in equation (2) since 1/ Tau n Beta / Delta t. However hereafter for explanatory purposes, it will be assumed that the parameter Beta is generated in order to complete the description of the novel system of the invention for generating velocity and position smoothing parameters. Reference is now made to FIG. 8 which is a block diagram for generating the position smoothing parameter Alpha . As herebefore described in conjunction with the chart shown in FIG. 3, the position smoothing parameter Alpha is generated as a function of the particular correlation mode and the relative value of Tau n with respect to 4Tscan. When correlation is in either the manual mode or an automatic correlation mode with a maNeuver gate, the value of Alpha is equal to unity. On the other hand, if correlation is automatic with a nonmaneuver gate, the value of Alpha is either unity or 1/2 unity, the latter value being generated when Tau n is greater than 4Tscan. In accordance with the teachings of the present invention, the circuitry is provided to generate Alpha which includes a comparator 81 provided with signals representing Tau n and 4Tscan. The output of comparator 81 is true when 4Tscan is equal to or greater than Tau n. This output is supplied to an ANd gate 82 as well as to an inverter 83. A signal representing automatic correlation with a nonmaneuver gate, designated 0G, is supplied to the other input of AND gate 82 as well as to an AND gate 84 provided with the output of inverter 83, with the output of the latter gate being supplied to a circuit 85 which is designated as a 1/2 value unit. Briefly, the function of circuit 85 is to provide an output which represents the value 1/2 being enabled by the true output of gate 84. The circuitry for generating Alpha also includes a circuit 86 which provides an output of unity when enabled by the output of an OR gate 87 having one of its input terminals connected to the output gate 82 and two other input terminals supplied with signals representing manual and automatic correlation in a maneuver gate, designated by 3G. From the foregoing, it should be appreciated that circuit 86 provides an output representing unity when correlation is in either manual or automatic correlation in a maneuver gate as well as when correlation is in an automatic nonmaneuver gate (signal 0G) and 4Tscan is equal to or greater than Tau n as indicated when the output of AND gate 82 is true. On the other hand, if when operated in an automatic nonmaneuver gate and the output of comparator 81 is false, the output of inverter 83 will be true and therefore the two input signals to ANd gate 84 will be true. Consequently, circuit 85 will be enabled to provide an output which represents the value of half unity. The output of circuits 85 and 86 are supplied to an OR gate 88, the output of which represents the position smoothing term Alpha . Although, herebefore, specific circuitry has been described for generating the term Tau n and therefrom the velocity and position smoothing parameters Beta and Alpha respectively, it should be appreciated to those familiar with the art that the arithmetic operations necessary to generate these parameters may be performed by the computer, employed in every automatic track-while-scan system. This may be accomplished by writing a specific computer program so that before the velocity and position smoothing parameters are to be incorporated in the track-while-scan equations, the smoothing term is first generated in accordance with the teachings hereinbefore described. Reference is now directed to FIG. 9 which is a flow diagram of a program which may be used to generate the term Tau n in accordance with the teachings hereinbefore described. The diagram is presented in a manner well familiar to those skilled in the art of computer programming. Similarly, FIG. 10 represents a flow diagram of a computer program necessary for generating Alpha in accordance with the teachings of the present invention. The teachings of generating variable velocity and position smoothing parameters may further be highlighted by the following examples. For the first example, let it be assumed that a blip to scan history may be represented by the following line (moving from left to right) wherein the ones represent hits and the zeros represent misses: 1 1 1 1 1 0 0 1 0 1 1 1 1 1 It is assumed that all correlation is in the automatic mode in a nonmaneuver gate (0G) and that Tscan is ten seconds. For the first