Abstract:
A Method, System and Apparatus for Maximizing a Jammer&#39;s Time and Power on Target is disclosed. System and method of the present invention provide an enhanced and more efficient jamming system that can address multiple simultaneous targets, such that the time-on-targets are maximized given a fixed amount of available system power. Such an enhanced surgical reactive jamming system allows users to more intelligently and efficiently address all targets that suddenly appear, without having to replicate more jamming system hardware which drastically raises the total overall costs. The system has the ability to do fast wideband scanning of the RF spectrum looking for RF signals such as those emitted by frequency hoppers and RCIED&#39;s, and then jam them instantaneously. Secondly, the system has the ability to pipeline the major operational functions so that more time can be spent putting energy on target (extends the TX Dwell Period effectively by allowing the jammer more time to apply energy, as opposed to spending time on calculations and re-tuning). Third, the system has the ability to change, mid TX Dwell Period, the output jamming frequencies so it can jam all the current targets with the maximum available power. Fourth and finally, the system has the ability to perform a real time evaluation of the DDS firing solutions such that the signals going to multiple DDS&#39;s in a jammer system can be multiplexed in a fashion that optimize time-on-target.

Description:
[0001]     This application is a continuation-in-part of application Ser. No. 10/912,976, filed Aug. 6, 2004, now pending. 
     
    
     BACKGROUND OF THE INVENTION  
       [0002]     1. Field of the Invention  
         [0003]     This invention relates to advanced military grade communications jamming systems and, more specifically, to a Method, System and Apparatus for Maximizing a Jammer&#39;s Time on Target. This unique state-of-the-art invention will have use in any modern military organization that wants to achieve communications dominance and information superiority over any battlefield. The invention will add an essential, and much needed, communications and electronic warfare capability to any respective governments&#39; national defense program.  
         [0004]     2. Description of Related Art  
         [0005]     Modern military grade communication systems today employ short, burst type transmissions that constantly cycle through a secret sequence of frequencies in order to prevent detection and jamming. Such systems are commonly known as frequency hoppers. Typically, these systems (both foreign and domestic) only transmit on a particular frequency for no more than a few milliseconds at the most. This creates a problem for those who want to detect and jam such transmissions as they happen so quickly. Practically, it is not feasible to simply “splash” the radio frequency spectrum with random noise in order to jam such transmissions. The reasons are that it requires an unpractical amount of power to apply sufficient RF energy to wash out all transmissions. In addition, there may be friendly transmissions that should not be jammed. Also, since the duration of the target transmissions is so short, it is not practical to have (for instance) a CPU that is programmed to evaluate signals, make a determination, and then command transmitters to jam. There is simply not enough time to engage the frequency hopping signals before they have moved on to a new frequency.  
         [0006]     The jammer device described by U.S. patent application Ser. No. 10/912,976 is sometimes referred to in the Electronic Warfare industry as a “wideband reactive jammer”, “surgical follower jammer,” or a “surgical reactive jammer” because it has the ability to quickly find enemy signals and then apply energy right on targets so as to jam those enemy communication signals. It has this capability because it uses a wideband digital reception technique to instantaneously detect the presence of enemy signal energy. Once the enemy signals are detected, they are then immediately jammed by using fast direct digital synthesizers (“DSS&#39;s”) to output RF energy right on those detected enemy signal frequencies.  
         [0007]     The use of low cost frequency hopping radios, radio controlled improvised explosive devices (RCIED&#39;s), and low cost burst transmitters in military/non-military theaters is growing. These communications devices are perfect for insurgents or terrorist groups due to their low cost and availability. Thus, the need for a super fast reactive jamming technology in order to deny the operation of one or multiple devices occurring simultaneously is critical. This is especially true for U.S. and Coalition forces in theater today.  
         [0008]     In order to address multiple targets appearing suddenly (and on any frequency), a jammer system must be fast enough to scan for and react to those new targets. In addition, the jammer system must have an efficient time-on-target technique to optimize the number of simultaneous targets it can be effective against by not wasting any time or energy. Furthermore, the jammer system must apply speed-up techniques in order to perform “look-throughs ” (the time the jammer system stops jamming temporarily and scans for additional targets) more frequently. And finally, the jammer system must do this in real time.  
         [0009]      FIG. 1  is a prior art drawing that depicts the conventional surgical reactive jamming system&#39;s attack cycle process  200  (i.e. the repetitive attack cycles of a surgical reactive jammer). For the first attack cycle  200  period, the jammer first tunes to frequency range segment  1 . The RX input is then turned on and the first “collection period” (for segment  1  data) commences. The first collection period is completed by turning off the tuner (tuners are synonymous with HF/VHF/UHF receivers) input. The jamming system then processes the received segment  1  data and turns on the jammer TX output on the desired frequency for a “TX Dwell Period”, and then stops jamming to do a quick “look-through” to receive and analyze the RF spectrum to see if there are additional targets appearing and also to determine if the earlier detected targets are still transmitting. The combination of TX Dwell, Collection period, and the analysis process is one single “attack cycle”. This cycle is repeated over and over again until the jammer is turned off. The problem with this prior art process and method is that during the tuning, collection, and processing periods, active jamming is not occurring. This is not an optimal approach to increasing time-on-target.  
         [0010]     What is needed therefore in order to feasibly maximize a jammer&#39;s time-on-target (that can be radiating on any frequency) as efficiently as possible, is a System that has the following attributes: 1) The abilities stated in the aforementioned U.S. patent application to do extremely fast wideband scanning for signal energy across wide ranges of the RF spectrum; 2) The real time ability to do pipelining of System functions; 3) The real time ability to jam one or more targets within each TX Dwell period; and 4) The real time ability to calculate the most optimal DDS firing solutions, given the targets presently detected. The sum of these system invention capabilities is unique.  
         [0011]     In addition to being applied for military tactical operations, such a technology invention would be extremely useful to the Department of Homeland Security, the Secret Service, the Central Intelligence Agency, etc. as the need to disrupt sudden, multiple enemy communications, on any frequency, has always been desired. Furthermore, with the recent threat of Radio Controlled Improvised Explosive Device type weaponry this invention is even more required today.  
       SUMMARY OF THE INVENTION  
       [0012]     In light of the aforementioned problems associated with the prior devices and methods used by today&#39;s military organizations, it is an object of the present invention to provide a Method, System and Apparatus for Maximizing a Jammer&#39;s Time on Target and Power on Target.  
         [0013]     It is an object of the present invention to provide an enhanced and more efficient jamming system that can address multiple simultaneous targets, such that the time-on-targets are maximized given a fixed amount of available system power. Such an enhanced surgical reactive jamming system will then allow users to more intelligently and efficiently address all targets that suddenly appear, without having to replicate more jamming system hardware which drastically raises the total overall cost, size, and weight. These enhancements for surgical reactive jammers are very applicable to jam multiple sudden transmissions. Examples of such sudden, frequency agile targets are multiple military grade frequency hopping nets (commonly known as “hoppers”) and multiple radio controlled improvised explosive devices (known as “RCIED&#39;s”).  
         [0014]     The preferred system needs to have the ability to do fast wideband scanning of the RF spectrum looking for RF signals such as those emitted by frequency hoppers and RCIED&#39;s, and then jamming them instantaneously. Secondly, the preferred system needs to have the ability to pipeline the major functions so that more time can be spent putting energy on target (extends the TX Dwell Period effectively by allowing the jammer more time to apply energy, as opposed to spending time on calculations and re-tuning). Third, the preferred system needs to have the ability to change the output jamming frequencies midstream (mid TX Dwell Period), so as to further maximize time-on-target. Fourth and finally, the preferred system needs to have the ability to perform a real time evaluation of the DDS firing solutions such that the signals going to multiple DDS&#39;s in a jammer system can be multiplexed in a fashion that maximizes the utilization of the available jammer transmitter power.  
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0015]     The objects and features of the present invention, which are believed to be novel, are set forth with particularity in the appended claims. The present invention, both as to its organization and manner of operation, together with further objects and advantages, may best be understood by reference to the following description, taken in connection with the accompanying drawings, of which:  
         [0016]      FIG. 1  depicts the attack cycle process of a conventional prior art jamming system;  
         [0017]      FIG. 2  depicts the pipelined attack cycle process of the system and method of the present invention;  
         [0018]      FIG. 3  depicts the preferred DDS firing solution lookup table process of the present invention;  
         [0019]      FIG. 4  depicts the pipelined attack cycle process of the present invention in even greater detail including the hyper fast, midstream enactment of the DDS firing solution; and  
         [0020]      FIGS. 5A-5D  depict a detailed flowchart of the operational method of the present invention for each attack cycle.  
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0021]     The following description is provided to enable any person skilled in the art to make and use the invention and sets forth the best modes contemplated by the inventor of carrying out his invention. Various modifications, however, will remain readily apparent to those skilled in the art, since the generic principles of the present invention have been defined herein specifically to provide a Method, System and Apparatus for Maximizing a Jammer&#39;s Time and power on multiple Targets.  
         [0022]     “Time-on-target” is defined as the amount of time a jamming signal is applied on an enemy transmission, expressed as a percentage of the total enemy transmission&#39;s time. The present invention provides enhanced efficiency by maximizing a surgical reactive jammer&#39;s time-on-target through the three major methods. Each method in itself enhances the time-in-target independent of the other two. The invention of this patent application employs all three unique methods. One of these methods is a set of algorithms for pipelining and algorithm speed optimization. Another method is the use of a fast DDS lookup table to determine the most optimal “firing solution” of the digital synthesizers to attack multiple targets. The last method is the extremely fast enactment of newly calculated firing solutions midstream in every TX dwell period. Basically, it applies the new solution instantly without waiting for the next attack cycle, which is how it is done today in prior art systems.  
         [0023]     The present invention can initially be understood by the side by side comparison of  FIGS. 1 and 2 .  FIG. 1  depicts a standard prior art attack cycle process. The linear process of tuning, detecting enemy signals, processing data, and then subsequently jamming them is a well known method. But  FIG. 2  depicts a preferred pipelined attack cycle approach employed by the present invention. This “Pipelining” of the system means that functions are performed in parallel in time to optimize speed of jammer reaction. For the first attack cycle period, the jammer already has a firing solution from a previous segment and is programmed to jam (TX dwell period). During this TX dwell period, the jammer in parallel retunes the tuner so that it is ready by the time the Collection period starts (the process of gathering new data on a different portion of the RF spectrum looking for new targets). In addition to that, the data that was collected in the previous attack cycle is calculated and a new firing solution is obtained. This new (and more up to date) firing solution is then ready to be applied. At the end of the TX dwell period the Collection period starts. Then the cycle repeats over and over again.  
         [0024]     As should be apparent, the critical distinction between this method and that of the prior systems is that the method of the present invention sets the cycle generator such that the tuner is tuned to the next frequency segment -during- when the jammer is outputting the jamming signals. In addition, the processing of what the previous look-through period detected is analyzed, and the DDS firing solution is determined also at the same time. This pipelining of the various major processes is one of the unique techniques that this algorithm invention employs. A far more detailed description of the entire algorithm process of this invention is outlined in the discussion of  FIGS. 4 and 5 .  
         [0025]     Now turning to  FIG. 3 , we can examine how the direct digital synthesizer (DSS) firing solutions are optimized during each and every TX dwell period to further maximize the time-on-target of the present system. This is the second, independent method by which the invention maximizes time-on-target and power on target.  FIG. 3  shows an example decision table of the invention showing how the most efficient DDS firing solutions are determined to maximize time-on-target, each attack cycle. The system goes through the list of predetermined criterion with the signals detected or predetermined and then makes the proper DDS firing solution based upon the number of simultaneous targets, and the available power of the system. This is the most efficient method to automatically determine the best DDS firing solution, by look up table. This process is repeated for every single Attack Cycle  202 .  
         [0026]     In this example  FIG. 3  drawing, there is one DDS available to be used for jamming. There can be multiple DDS&#39;s in any system though, but  FIG. 3  is presented with only one DDS for simplicity. The number of targets that are detected during each Collection Period, and determined to be jammed, is represented in the left column. In the DDS columns, are representative drawings of the TX Dwell Period outputted from the DDS over three successive attack cycles. If the TX Dwell Period is broken up into several boxes, each box represents jamming on a target frequency (F 1 , F 2 , F 3 , F 4  . . . ) for a period of time. This example assumes that the maximum number of “timing slots” during a single TX Dwell Period is three. In that case, the algorithm will optimize and time-share the jamming of targets into “time slots”. This intelligent technique of time-slotting the jammer&#39;s energy over the various target frequencies through a programmable high speed lookup table greatly enhances the respective time-on-targets. If we now turn to  FIG. 4 , we can examine the pipelined jamming method in even greater detail.  
         [0027]     As mentioned,  FIG. 4  further depicts the method of  FIG. 2  in greater detail. It outlines the last major method of this invention to maximize time-on-target.  
         [0028]     This method implements the DDS firing solution as fast as theoretically possible, thereby also increasing the time-on-target. After signals are detected in a Collection Period  16 A, the jammer must process the data  18 A in order to determine what the jamming firing solution is. Once determined, the jammer will immediately stop jamming on the previous target(s) and will instead jam on the new targets. This process is done extremely fast due to the fact that direct digital synthesizers are used which can switch frequencies in less than a microsecond. Such a speed-up process increases the effective time-on-target as well.  
         [0029]     As should be clear from the drawing, the TX dwell periods are actually broken up (potentially) into transmissions on two different sets of frequencies based on previous segment data, and segment  1  data. While the first portion of TX dwell period  10 B- 1  is ongoing, the tuner are being tuned to new segment  2 . In addition, the segment  1  data is being processed  18 A. Once  18 A is complete, a new DDS firing solution is output and the DDS&#39;s can be instantly retasked with the newer more updated programming. Thus, the TX dwell period  10 B is actually broken up into  10 B-I and  10 B- 2 . Where the  10 B- 1  period is for the previous DDS firing solution, and  10 B- 2  is for the new DDS firing solution calculated from processing stage  18 A. In this way, the invention does not have to wait until that particular cycle is complete to enact the new programming. The new programming can occur midstream which enhances time-on-target.  
         [0030]     To describe the process of  FIG. 4 , the jamming (TX dwell) period  10 A begins with the turning on of the TX PIN switch  104 A, the turning on of the PA  106 A, and the triggering of the TX dwell period  108 A. It is assumed, for simplicity, that the jamming of targets is already known from the previous attack cycle. For further simplicity, the tuning to segment  1  and the processing of segment N (previous segment) pipelined steps are not shown on this drawing, they are only shown during the next pipelined attack cycle  202 .  
         [0031]     Continuing forward, at the completion of TX dwell period  10 A, the PA output is turned off  110 A, and the TX PIN switch turned off  112 A. Then the RX input is turned on  114 A. And then finally the collection period is triggered  116 A. The collection period  16 A for the segment  1  data then commences (as will become clear, the receiving system has already been tuned to segment  1 ). Upon completion of the collection period  16 A, the tuner input is turned off  102 A, the TX PIN switch turned on  104 B, the PA turned on  106 B, and the next TX dwell period is triggered  108 B.  
         [0032]     While the data received during segment  1  collection period  16 A is being processed  18 A, the tuner is/are being tuned  20 B to the next frequency range segment of interest (segment  2 ). Once segment  1  data processing period  18 A is complete (and the data is processed), the transmitter(s), already jamming at the frequency from the previous TX dwell period are rapidly reprogrammed to the new jamming frequency in the middle of the new TX dwell period  10 B.  
         [0033]     Repeating the previous steps, after the TX dwell period  10 B is complete, the TX output is then turned off  10 B, the TX PIN switch turned off  112 B. Then nearly immediately the RX input is nearly immediately turned on  114 B, the collection period is triggered  116 B, after which the collection period for segment  2  data  16 B is commenced. This once again leads to the RX input tuned off  102 B, the TX PIN switch turned on  104 C, the PA turned on  106 C, and the next TX dwell period is triggered  108 C, and followed virtually immediately by the TX output re-commencing  10 C.  
         [0034]     If we finally turn to  FIGS. 5A-5D , we can examine the flow chart detailing the method executed by the present invention. This diagram shows the decision tree process throughout one single Attack Cycle series (where the jammer moves from tuner segment/band to tuner segment/band before starting the process over). A “segment” or “frequency band” is one stare bandwidth of the front end tuner. An attack cycle is the process of the jammer applying energy, switching, and then opening the tuner to do a “look through” to determine what target signals have appeared.  
         [0035]     Each cell of the flow diagram indicates the action of the jammer as it goes through a single attack cycle series. The process starts at event A on  FIG. 5A  and goes through several sub-stages before returning again to A at termination of the process chart in  FIG. 5D .  
         [0036]     If programmed to jam, the TX PIN switch is switched on  104 A; if not programmed to jam, the system will jump to event F ( FIG. 5C ). At nearly the same time, the power amplifier will turn on  106 A, and the TX dwell timer will be started  108 A.  
         [0037]      FIG. 5B  depicts how then the TX dwell period  10 A begins on the first jamming frequency. If more frequencies do not have to be jammed with the same power amplifier, it means that only a single frequency will be jammed, and there will be a wait period of T 1  microseconds (the transmit dwell time) while jamming continues on that first frequency.  
         [0038]     But if there is more than one frequency to jam, but less than three frequencies, the system will wait T 1 /2 microseconds (i.e. jamming on the first frequency for the wait time one half the T 1  period), and then switch to output/transmit on the second transmitting frequency and will wait another T 1 /2 microseconds (i.e jamming on the second frequency during this second wait time).  
         [0039]     If there are three frequencies to jam, the system will wait T 1 /3 microseconds (i.e. transmitting on the first jamming frequency for one third the T 1  period), will switch to the second jamming frequency and wait for another T 1 /3 microseconds (transmitting on the second jamming frequency), and then finally switch to the third jamming frequency and wait the last T 1 /3 microseconds. Event C is the completion of the TX dwell period;  FIG. 5C  describes the ensuing steps.  
         [0040]     First, the power amplifier is turned off  110 A and the TX PIN switch is also turned off  112 A. The system will wait for period of T 2  microseconds  22 A, until the PA has powered down and all reflected energy from the immediate surrounding terrain has died out. When the tuner is ready, the RX PIN switch is turned on  114 A. If the system is not equipped with GPS, then a backup pulse is used to substitute for the timing interval that is normally received from the GPS. If systems are equipped with GPS, the system will await for a GPS synchronization pulse so that jamming systems in close proximity to one another will cooperatively synchronize their respective collection periods to prevent them from jamming each other (since all of the collection periods are of the same microsecond length).  
         [0041]     Next, the system waits for a period of T 3  microseconds  14 A to allow the received signals to propagate through the tuner&#39;s filters, after which data collection is triggered  116 A. Event D is the commencement of the collection period and continues to be described in  FIG. 5D .  
         [0042]     While in the collection period, the system will wait for period T 4  microseconds  16 A, a period of time adequate to allow the system to perform the necessary FFT calculations to detect and identify new arriving signals. The RX PIN switch is then turned off  102 A to protect the jammer&#39;s tuner from saturation due to the outgoing jamming signal. This ends the pipelined attack cycle  202  and the process begins again with events  104 B, 106 B and  108 B. The spectrum data just received is processed  18 A while the tuner is tuned  20 B to the next frequency segment. Both of these events occur while the jammer is in the next TX dwell period  10 B.  
         [0043]     Again, this entire process is depicted in  FIG. 4  which pictorially shows the step by step processes and when they occur.  
       DIAGRAM REFERENCE NUMERALS  
       [0044]      10 A T 1  Period (TX dwell—attack cycle A)  
         [0045]      10 B T 1  Period (TX dwell—attack cycle B)  
         [0046]      10 B- 1  Attack cycle B TX dwell using previous attack cycle&#39;s DDS firing solution  
         [0047]      10 B- 2  Attack cycle B TX dwell using updated DDS firing solution  
         [0048]      12 A T 2  Period (wait period for PA to shut down—attack cycle A)  
         [0049]      12 B T 2  Period (wait period for PA to shut down—attack cycle B)  
         [0050]      14 A T 3  Period (wait period for signal propagation—attack cycle A)  
         [0051]      14 B T 3  Period (wait period for signal propagation—attack cycle B)  
         [0052]      16 A T 4  Period (collection period—attack cycle A)  
         [0053]      16 B T 4  Period (collection period—attack cycle B)  
         [0054]      18 A Process Segment  1  Data taken during  16 A  
         [0055]      20 B Tune to Frequency Segment  2 , during process  10 B  
         [0056]      102 A Turn OFF the RX PIN switch—attack cycle A  
         [0057]      102 B Turn OFF the RX PIN switch—attack cycle B  
         [0058]      104 A Turn ON the TX PIN switch—attack cycle A  
         [0059]      104 B Turn ON the TX PIN switch—attack cycle B  
         [0060]      106 A Turn ON the PA—attack cycle A  
         [0061]      106 B Turn ON the PA—attack cycle B  
         [0062]      108 A Start TX Dwell Timer—attack cycle A  
         [0063]      108 B Start TX Dwell Timer—attack cycle B  
         [0064]      110 A Turn OFF the PA—attack cycle A  
         [0065]      110 B Turn OFF the PA—attack cycle B  
         [0066]      112 A Turn OFF the TX PIN switch—attack cycle A  
         [0067]      112 B Turn OFF the TX PIN switch—attack cycle B  
         [0068]      114 A Turn ON the RX PIN switch—attack cycle A  
         [0069]      114 B Turn ON the RX PIN switch—attack cycle B  
         [0070]      116 A Trigger Collections—attack cycle A  
         [0071]      116 B Trigger Collections—attack cycle B  
         [0072]      200  Prior Art (Non-Pipelined) Attack Cycle  
         [0073]      202  Pipelined Attack Cycle  
         [0000]     Operational Summary  
         [0074]     For surgical reaction jammers, the key is to reduce the attack cycle to as short a possible time. This is because by making the attack cycle short, the jammer can scan and pick up targets in other areas of the spectrum much faster. The heart of all jammer systems is how fast it can pick up targets and then jam on them. In addition, the governing criterion is how much power is available to feasibly jam all the targets. In real world systems, the power available is finite and thus some level of time-sharing of targets has to occur. Otherwise, one would simply just apply as many power amplifier chains as possible to account for the presence of multiple targets. But this is not feasible in the real world. Thus, the algorithm of this invention aims to do several things in order to solve these issues, it optimizes the process of jamming, it optimizes the firing solution by using predetermined time-sharing of multiple targets under certain scenarios, and finally it optimizes the speed with which that firing solution is actually enacted.  
         [0075]     There are several timers in the jamming cycle generator that are adjustable, and regulate exactly when (to the precise microsecond), that each process should occur so that the entire process is as efficient as possible. These various steps are outlined in detail in  FIGS. 5A-5D . The basic timers (T 1  through T 4  periods) are explained as well in those figures.  
         [0076]     First, the algorithm pipelines the jamming process so that an attack cycle is reduced to its minimum length of time. The tuning of the tuner is done in parallel while the jammer is in its TX Dwell Period. In addition, processing of data is done in parallel. The timing of these actions must be precisely coordinated so that the system is synchronized. The cycle generator function, described by the previous patent application Ser. No. 10/912,976, performs these functions with microsecond timing accuracy.  
         [0077]     Another way that the invention enhances efficiency and time-on-target is to have the jammer automatically apply the most optimal DDS firing solution based upon the number of targets encountered. It does so by the jammer employing a DDS firing solution lookup table. For surgical reactive jammers with more than one DDS, this innovation is critical to enhance the efficiency of the jammer. If, for example, 3 targets are detected simultaneously, the jammer will go to this truth table and instantly apply maximum power on an optimized time-sharing basis between the available DDS&#39;s and transmitters. It does so knowing the power capabilities of the system. Thus, it will not overextend its available primary power subsystem. Essentially this is a fast implementation of time-sharing and power-sharing of the available transmit assets in the jammer system.  
         [0078]     If additional targets appear, then the jammer is programmed to rotate through the various signals given the available PA power that can be applied, as shown in the example of  FIG. 3 . Thus, the time-sharing is optimized so that as many targets as possible are hit with the available power. This optimization table is installed inside the dedicated hardware logic of the jammer. It must be there to handle the microsecond timing of the entire jammer.  
         [0079]     The final way that the invention enhances efficiency and time-on-target is to speed with which a DDS firing solution is applied. Jamming signals can be adjusted on the fly, midstream while in a TX Dwell Period. As the reader can see by  FIG. 2 , the pipelining of the process now allows the system to evaluate what signals were detected on the previous Collection Period. While this process is calculating, the jammer will apply energy exactly on the last known frequencies of the enemy targets. This maximizes the time-on-target by making the assumption that the enemy signals are still there.  
         [0080]     Once the Collection Period processing is complete, and the DDS firing solutions are determined, the algorithm of this invention will instantly command the DDS&#39;s to their new firing solution. Thus, the jamming signals may or may not be changed mid TX Dwell Period. This process is unique and provides the user with the maximum theoretical time-on-target capabilities, giving maximum utilization of the available system power. Again, this invention aims to improve the efficiency and speed of reactive jamming given real world constraints.  
         [0081]     Those skilled in the art will appreciate that various adaptations and modifications of the just-described preferred embodiment can be configured without departing from the scope and spirit of the invention. Therefore, it is to be understood that, within the scope of the appended claims, the invention may be practiced other than as specifically described herein.