Distributed matrix wiring assembly

FIELD OF THE INVENTION

This invention relates to harness wiring for satellite equipment and more particularly to a distributed matrix wiring assembly for satellite payload equipment.

BACKGROUND OF THE INVENTION

Satellite payload equipment command and telemetry signals are typically generated by a command module and transmitted to the payload equipment through a wire harness. The wire harness is typically connected to the command module through a routing matrix. A routing matrix consists of an arrangement of routing relays configured to independently connect individual rows and columns to the command module. Each unique combination of one row and one column is designated as a node, the number of nodes in the matrix being equal to the product of the number of rows and columns. Typically, a routing matrix is physically located at or near the command module. Each node in the routing matrix is connected to the satellite payload equipment via two harness wires in a payload equipment-to-command module wire harness. Specifically, command and telemetry routing matrix nodes are used to route command and telemetry signals between a command module and associated satellite payload equipment. This means that satellite payload equipment that is controlled by 100 matrix nodes of a command module would require a wire harness having 200 harness wires in order to connect to the command module. Wire harnesses and associated support fasteners make a significant contribution to the mass of a satellite.

FIG. 1 is a schematic diagram that illustrates a traditional matrix wiring assembly 5 for a satellite payload equipment device 9 that uses 6 matrix nodes. Since equipment device 9 uses 6 matrix nodes, it requires a wire harness 7 that contains 12 harness wires to connect it to a command module 8 as shown though routing matrix 6. A payload management computer 3 is coupled to both pulse generator 2 and routing matrix 6. Routing matrix 6 contains row and column routing relays 4 that selectively connect pulse generator 2 to circuitry within payload equipment device 9 via node1 through node6 (FIG. 1). As noted above, the number of nodes in routing matrix 6 equals the product of the number of rows and columns associated with routing matrix 6. That is, since two wires are required for each routing matrix node, wire harness 7 will need to contain 12 harness wires in order to connect command module 8 to satellite payload equipment device 9. Attempts have been made to reduce the number of harness wires within wire harness 7 that are required to connect command module 8 to satellite payload equipment device 9.

For example, U.S. Pat. No. 5,961,076 to Eller et al., and U.S. Pat. No. 5,938,703 to Zwang each disclose modular spacecraft equipment for reducing the number of wire harness connections between a command module and payload equipment. In particular, Eller et al. teaches the use of reusable independent payload modules, while Zwang teaches a method for controlling devices in response to serial digital command signals through the use of embedded command modules. However, these approaches increase the complexity and cost of the payload equipment modules while potentially reducing reliability.

Also, U.S. Patent Application No. 2003/0113121 to Gayrard et al. and Japanese Patent No. 01261934 to Masahito disclose the use of specialized transmission equipment to reduce the number of wire links in the wire harness. In particular, Gayrard teaches the use of infrared transmission links and Masahito teaches the use of laser beam transmission links. Again, these approaches increase the complexity and cost of the payload equipment modules while potentially reducing reliability.

SUMMARY OF THE INVENTION

The invention provides in one aspect, a distributed matrix wiring assembly for connecting a routing relay module to a payload equipment device over a first set of harness wires having first and second ends, said routing relay module being adapted to provide a plurality of driving signals to said set of harness wires at the first end, said payload equipment device having an overall matrix node requirement, said assembly comprising:

- (a) a distributed matrix module coupled to said first set of harness wires at the second end and coupled to said payload equipment device, said distributed matrix module including:
  - (i) at least one distributed matrix column wire;
  - (ii) at least one distributed matrix row wire;
  - (iii) said distributed matrix column and row wires being configured to form a distributed matrix having distributed matrix nodes, each distributed matrix node being defined by the unique combination of a distributed matrix column wire and a distributed matrix row wire;
- (b) such that the distributed matrix nodes form at least a portion of the overall matrix node requirement.

Further aspects and advantages of the invention will appear from the following description taken together with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

For a better understanding of the present invention, and to show more clearly how it may be carried into effect, reference will now be made, by way of example, to the accompanying drawings which show some examples of the present invention, and in which:

FIG. 1 is a schematic diagram of a conventional prior art wiring matrix utilized to connect a command module to satellite payload equipment;

FIG. 2 is a block diagram of an example distributed matrix wiring assembly of the present invention for connecting a command module to one payload equipment device;

FIG. 3A is a schematic diagram of an example distributed matrix wiring assembly of the present invention where the distributed matrix module is integrated within the payload equipment device;

FIG. 3B is a schematic diagram of an example distributed matrix wiring assembly of the present invention where the distributed matrix module is a separate module;

FIG. 4 is a schematic diagram of another example payload equipment device with eight three position switches that are integrated within distributed routing matrix of the present invention;

FIG. 5 is a block diagram of another example distributed matrix wiring assembly of the present invention for connecting multiple payload equipment devices;

FIG. 6 is a block diagram of another example partially distributed matrix wiring assembly of the present invention;

FIG. 7 is a block diagram of another example hybrid traditional-distributed matrix wiring assembly of the present invention;

FIGS. 8A and 8B are block diagrams of another example distributed matrix wiring assembly of the present invention for connecting two or more payload equipment devices to a single distributed matrix;

FIG. 9 is a block diagram of an example distributed matrix assembly adaptor of the present invention for adapting to payload equipment devices that use traditional wire harnesses; and

FIG. 10 is a schematic diagram of another example distributed matrix wiring assembly of the present invention where the distributed matrix module is three dimensional.

It will be appreciated that for simplicity and clarity of illustration, elements shown in the figures have not necessarily been drawn to scale. For example, the dimensions of some of the elements may be exaggerated relative to other elements for clarity. Further, where considered appropriate, reference numerals may be repeated among the figures to indicate corresponding or analogous elements.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 2 illustrates a distributed matrix wiring assembly 10 built in accordance with the present invention. Distributed matrix wiring assembly 10 is used to route command, remote management, control and telemetry signals between command module 12 and payload equipment device 20 through wire harness 16 using routing relays 13 within routing matrix 17 which provide signals to a distributed matrix module 14. The distributed matrix module 14 in is turn coupled to the circuitry of a payload equipment device 20. As will be described, distributed matrix wiring assembly 10 in effect shifts over at least some of the matrix wiring nodes that would conventionally be located within the routing matrix 17. Doing so, significantly reduces the number of harness wires required within wire harness 16 as will be described. To provide maximum benefit, the distributed matrix module 14 is located as close as possible to payload equipment device 20.

As will be described, distributed matrix assembly 10 allows payload equipment device 20 (e.g. a 6 node device) to be controlled through a wire harness 16 with fewer wires (e.g. 5 harness wires) than the conventional case (FIG. 1). This is because in the example given, 3 row harness wires and 2 column harness wires located at the payload equipment device 20 will form the required 3×2 harness wire matrix having 6 nodes. Implementation of distributed matrix wiring assembly 10 does not require changes to command module 12 or the installation of additional switches or electronic components within payload equipment device 20. The row and column harness wires are connected as required to the circuitry of equipment device 20.

Payload equipment device 20 is a typical satellite payload device that contains payload circuitry 15 which is activated by command signals, generating telemetry signals or indicating status (e.g. RF switch assemblies, telemetry assemblies, power relays, etc.) and that receives control signals through the harness wires of wire harness 16. The harness wires of wire harness 16 are preferably categorized as either column or row matrix wires and provided to payload circuitry 15 of payload equipment device 20 in a one-to-one manner. However, it should be understood that other types of matrix wires could be utilized as well. Depending on the configuration of the payload equipment device 20, wire connections between wire harness 16 and payload equipment device 20 could be made via wire junctions or circuit board traces.

Distributed matrix 14 is either integrated into the circuitry of payload equipment device 20 (FIG. 3A) or a separate module (see FIG. 3B). In either case, distributed matrix 14 comprises a number of distributed nodes that are formed by the unique combination of distributed column and row wires. It should be understood that while many of the example implementations of distributed matrix assembly 10 only include distributed matrix column and row wires, additional types of distributed matrix wires could be utilized to form the distributed matrix nodes.

Routing relays 13 of routing matrix 17 are used to drive the matrix row and column wires of distributed matrix module 14 at the other end of wire harness 16 as shown in FIG. 2. As shown, there are no traditional matrix node connections within routing matrix 17 and all of the matrix row and column nodes are distributed to the distributed matrix module 14. Routing relays 13 are preferably FET-based but it should be understood that various kinds of electronic switching elements could be used.

Command module 12 provides command and control functions for payload equipment device 20. Generally, and as conventionally known, command module 12 is utilized to generate and/or receive signals using a power source (not shown) and a pulse generator 26 and to connect them to the appropriate matrix rows and columns via activation of routing relays 13. It should be understood that command module 12 could be any device that generates and/or receives signals and that may have a different configuration than the version shown in FIG. 2.

Payload management computer 22 is typically implemented using conventional computing processors and memory chips. Power supply (not shown) and pulse generator 26 are also well known conventional components. Management computer 22 generates command and control signals for transmission to payload equipment device 20 and sends them to routing relays 13. Management computer 22 simultaneously actuates routing relays 13 such that command and control signals are selectively routed through routing relays 13 for transmission over wire harness 16. Payload management computer 22 could be implemented using any circuitry (FPGA for example) capable of carrying out the above functions based on internally (i.e. embedded software) or externally (i.e. ground station or separate onboard device) generated commands. That is, it should be understood that payload management computer 22 does not need to be a computer. Also, it should be understood that pulse generator 26 could be replaced by any signal generating or receiving device.

As will be described further, the use of distributed matrix assembly 10 ensures that at least a portion of the nodes of the overall wiring matrix associated with distributed matrix wiring assembly 10 are located within distributed matrix module 14. This approach significantly reduces the number of harness wires required within wire harness 16 to connect command module 12 to payload equipment device 20.

Referring now to FIG. 3A, a more detailed schematic view of a preferred example implementation of distributed matrix assembly 10A is shown. Specifically, distributed matrix 14 is integrated within the circuit connections of payload equipment device 20. The example payload equipment device 20 contains two (2) 3-position switches that are directly connected to wire harness 16. As shown, column1, column2, row1, row2 and row3 harness wires of wire harness 16 are provided directly to the relevant positions of switches SW01 and SW02 within payload equipment device 20. The wires in wire harness 16 equal the number of column and row wires (5 in this example).

Referring now to FIG. 3B, a detailed schematic view of another example implementation of distributed matrix assembly 10B is shown. Specifically, distributed matrix module 14 is utilized as separate module (or as a harness adapter) that is then directly connected to payload equipment device 20. Again the example payload equipment device 20 contains two (2) 3-position switches that are in this case are connected to distributed matrix module 14. Column1, column2, row1, row2 and row3 harness wires of wire harness 16 are provided to distributed matrix module 14.

The column and row harness wires are then configured within distributed matrix module 14 to form a distributed matrix having distributed matrix nodes. Each distributed node is defined by the unique combination of a distributed matrix column wire and a distributed matrix row wire. The wires in wire harness 16 equal the number of column and row wires (5 in the example shown in FIG. 3B). Finally, matrix module 14 is connected to payload equipment device 20 through a set of wires 19 that contains a number of wires that is double the number of nodes within distributed matrix module 14 (i.e. the usual 2 wires per matrix previously required within wire harness 16).

FIG. 4 is a schematic wiring diagram of an example distributed matrix module 14 that is integrated within payload equipment device 20 having eight 3-position electromechanical RF switches SW01 to SW08. As conventionally known, each switch SW01 to SW08 is capable of being in one of three positions, namely Pos1, Pos2, or Pos3.

Specifically, distributed matrix module 14 consists of six row harness wires (Row1(+) to Row6(+)) and the four column harness wires (Column1(−) to Column4(−)) which are adapted to connect to the payload equipment connector row pins 21 and the payload equipment connector row pins 23, respectively. It should be understood that the diodes illustrated in FIG. 4 are also required in the traditional matrix assembly 5 within the routing matrix module 6 (FIG. 1). Table 1 provides an illustrative comparison between the wire harness requirements of traditional matrix assembly 5 and the wire harness requirements of distributed matrix wiring assembly 10.

TABLE 1Wire Harness ComparisonDistributed MatrixConventional MatrixWireASSEMBLYWiresConfigurationWiresConfigurationReductionTwo (2) 3-Position5 3 × 2 Matrix12 6 Nodes58%SwitchesFour (4) 3-Position7 3 × 4 Matrix24 12 Nodes71%SwitchesSix (6) 3-Position9 3 × 6 Matrix36 18 Nodes75%SwitchesEight (8) 3-Position10 4 × 6 Matrix48 24 Nodes79%SwitchesSixty (60) 3-Position2712 × 15 Matrix360180 Nodes93%Switches

As can be seen, significant reductions in the number of harness wires required can be achieved by distributed matrix assembly 10. More generally, it can be seen that the number of wires required within the wire harness 7 within traditional matrix assembly 5 where the wiring matrix is not distributed is:

N=2×R×C

- where N is the number of harness wires, R is the number of rows and C is the number of columns. In contrast, the number of wires required within the wire harness 16 within distributed matrix assembly 10 where the wiring matrix is distributed to payload equipment device 20 is:
  
  N=R+C

Accordingly, the reduction in the number of harness wires needed is directly proportional to the number of matrix nodes being located within distributed matrix module 14. The specific percentage reduction in the number of harness wires when utilizing distributed matrix assembly 10, is:

Reduction (%)=100×(1−((R+C)/(2×R×C)))

Distributed matrix wiring assembly 10 can be implemented in various configurations as will be described in relation to FIGS. 5 to 9. It should be understood that variations of distributed matrix wiring assembly 10 discussed below could be used individually or in combination to achieve optimized system design for particular controller and payload equipment operational specifications.

FIG. 5 is a block diagram of another example distributed routing matrix assembly 50 of the present invention for connecting command module 12 to multiple payload equipment devices 20a and 20b. Payload equipment devices 20a and 20b are controlled over wire harnesses 16a and 16b by routing relays 13 of routing matrix 17. The nodes of distributed matrix modules 14a and 14b are connected to the circuitry 15a and 15b of payload equipment devices 20a and 20b. Distributed routing matrix assembly 50 operates in a similar manner to distributed routing matrix wiring assembly 10 since it is also of a “fully distributed” configuration.

It should be understood that payload equipment device 20a may operate on harness wire rows 1-2 and harness wire columns 1-8 while payload equipment device 20b operates on harness wire rows 1-2 and harness wire columns 9-16. Alternatively, they could also operate on separate rows and columns of wire harness 16. It is also possible in other implementations for two or more devices to operate in parallel from the same harness wire rows and columns.

The difference between distributed routing matrix assembly 50 and distributed routing matrix wiring assembly 10 is that two separate wire harnesses 16a and 16b are used to transmit the command and control signals from command module 12 to two separate payload equipment devices 20a and 20b, respectively. As shown in FIG. 5, each wire harness 16a and 16b contain only one wire per distributed matrix row and 1 wire per distributed matrix column. This approach can be generalized to any number of wire harness 16, distributed matrix modules 14 and payload equipment devices 20. It should be understood that wire harnesses 16a and 16b do not need to be physically separate.

FIG. 6 is a block diagram of an example of a partially traditional-distributed routing matrix assembly 100 of the present invention. Distributed routing matrix assembly 100 is “partially distributed” due to a mixture of traditional matrix node connections and distributed matrix connections. That is, distributed routing matrix assembly 100 distributes only part of the overall matrix node connections to the distributed matrix module 14 (e.g. only 3 columns and 6 rows of a 20×20 matrix). This configuration allows for the connection of command module 12 to a payload equipment device 20a that is associated with a distributed matrix module 14 and a payload equipment device 20b that is not associated with a distributed matrix module 14 (i.e. an non-upgraded payload equipment device).

As shown, payload equipment devices 20a and 20b are controlled by command module 12 over wire harnesses 16a and 16b, respectively. However, while wire harness 16a is a one wire per distributed matrix row and column wire type wire harness, wire harness 16b is a traditional-style wire harness with the usual two wires per matrix node. Command module 12 uses routing relays 13 to drive the matrix row and column wires of distributed matrix module 14 at the other end of wire harness 16. The nodes of distributed matrix module 14 are then connected to circuitry 15 of payload equipment device 20.

Routing matrix 17 is also used in the conventional way to provide command and control signals to payload equipment device 20b through traditional connections 29 over traditional wire harness 16b. Specifically, as shown nodes node1 to node4 are utilized within routing matrix 17 to drive the wires in wire harness 16b. It should be understood that in this configuration it is possible to accommodate any number of distributed payload devices 20a and traditional payload devices 20b using this approach.

FIG. 7 is a block diagram of another example hybrid traditional-distributed routing matrix assembly 150 of the present invention that is adapted to accommodate a single hybrid payload equipment device 20 using a mixture of traditional and distributed matrix connections.

As shown, hybrid payload equipment device 20 is controlled by command module 12 over wire harnesses 16a and 16b, respectively. Wire harness 16a is a one wire per distributed matrix row and column wire type wire harness and wire harness 16b is a traditional-style wire harness with the usual two wires per matrix node. In addition, command module 12 uses routing relays 13 to drive the matrix row and column wires of distributed matrix module 14 at the other end of wire harness 16a. The nodes of distributed matrix module 14 are then connected to circuitry 15 of payload equipment device 20.

Command module 12 is used in the conventional way to provide command and control signals to payload equipment device 20b through traditional connections 29 over traditional wire harness 16b. Specifically, as shown nodes node1 to node4 are utilized within routing matrix 17 to drive the wires in wire harness 16b. It should be understood that this configuration can be used to accommodate any number of such hybrid payload devices 20.

FIGS. 8A and 8B are block diagrams illustrating another example distributed routing matrix assembly 200 of the present invention that can be used to connect two or more payload equipment devices 20a and 20b to command module 12 using a single distributed matrix module 14.

In this configuration, a single distributed matrix module 14 is associated with payload equipment device 20a in order to reduce the number of harness wires within wire harness 16a from command module 12. Wire harness 16a is a one wire per distributed matrix row and column wire type wire harness 16a, wire harness 16b is a traditional-style wire harness with the usual two wires per matrix node. Command module 12 uses routing relays 13 within routing matrix 17 to drive the matrix row and column wires of distributed matrix module 14 at the other end of wire harness 16a.

The nodes of distributed matrix module 14 are connected to circuitry 15 of payload equipment device 20a. Then distributed matrix module 14 associated with payload equipment device 20a passes command and control signals that it has received from command module 12 to payload equipment device 20b through traditional connections 29 over traditional wire harness 16b. It should be understood that this configuration can be used to accommodate any number of “piggybacked” payload equipment devices 20b.

FIG. 9 is a block diagram of an example distributed routing matrix assembly adaptor 250 of the present invention that is used to provide retrofitting functionality in the case where it is desired to interface with traditional payload equipment devices. This arrangement provides for a retrofitting solution when it is not possible to easily attach or integrate the distributed matrix module 14 within a traditional payload equipment 20 as discussed above.

In this configuration, a single distributed matrix adapter module 34 is coupled to command module 12 through a one-wire per distributed matrix rows/column wire harness 16a in order to reduce the number of harness wires required. The distributed matrix row and column wires of distributed matrix 14 within adapter module 34 are driven by routing relays 13. Adapter module 34 is then coupled through a traditional wire harnesses 16b and 16c which each consist of two-wires per distributed matrix node (i.e. of distributed matrix module 14). Payload equipment 20a and 20b receive command and control signals over traditional wire harnesses 16b and 16c directly from the distributed matrix nodes within distributed matrix module 14. It should be understood that this configuration can be used to accommodate any number of retrofitted payload equipment devices 20a, 20b. For maximum benefit, adapter module 34 is located in close proximity to payload equipment 20a and 20b, that is wire harness 16a is much longer than wire harness 16b or 16c.

Distributed matrix wiring assembly 10 can be used for any system in which a switching matrix can be used to connect one device to another device. The primary application for the distributed routing matrix is for the distribution of command and telemetry signals from a satellite command module to remote payload equipment. Other possible applications include: distributed routing matrices for analog, digital, or radio frequency signal connections, distributing all of the rows and columns of a routing matrix to a device, distributing a portion of a routing matrix (i.e. 2 columns and 6 rows of a 20×20 routing matrix) to a device, a mixture or distributed and conventional routing matrix connections to a device, connecting two or more devices to a single distributed routing matrix, distributed routing matrix wire harness adapters, distributed routing matrices with more than two matrix dimensions, distributed routing matrices for non-satellite applications and distributed routing matrices where common electronics, wires or other electronics are consolidated.

FIG. 10 is a schematic diagram of a three dimensional matrix configuration implementation of distributed matrix wiring assembly 10. As shown, payload equipment device 20 contains sub-devices 28a and 28b that are powered by the row and column matrix connections. The positions of the sub-devices 28a and 28b are selected via logic signals transmitted over connections on the third dimension (i.e. the Level 1 and Level 2 wires shown) of distributed matrix 114. As before, management computer 22 is coupled to routing relays 13 and pulse generators 26a and 26b. It should be understood that the distributed nodes of the distributed matrix 114 is defined by a unique combination of a distributed matrix column wire, a distributed matrix row wire and a distributed matrix level wire. Similarly, it should be understood that routing matrices with more than three dimensions are also contemplated and the same concepts and implementation issues discussed above would apply.

While certain features of the invention have been illustrated and described herein, many modifications, substitutions, changes, and equivalents will now occur to those of ordinary skill in the art. It is, therefore, to be understood that the appended claims are intended to cover all such modifications and changes as fall within the true spirit of the invention.

Distributed matrix wiring assembly

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